CN107461243B - Integrated device, exhaust gas aftertreatment system and control method - Google Patents

Abstract

An integrated pump and nozzle device includes a pump assembly and a nozzle assembly. The pump assembly is provided with a housing cavity for housing the nozzle assembly, a pump assembly housing and the pump. The pump assembly housing includes an inlet passage and an outlet passage in communication with the nozzle assembly. The pump assembly includes a housing, a motor coil for driving the pump, a magnetic body, and first and second gear assemblies engaged with each other. The motor coil is in interference fit in the housing cavity. The nozzle assembly includes a nozzle assembly housing and the nozzle. The nozzle assembly further includes a nozzle coil for driving the nozzle, wherein the motor coil and the nozzle coil are independently controlled, respectively. The integrated device has simple and compact structure and higher control accuracy. In addition, the invention also relates to an exhaust aftertreatment system and a control method.

Description

Integrated device, exhaust gas aftertreatment system and control method

Technical Field

The invention relates to an integrated device, a tail gas aftertreatment system and a control method, and belongs to the technical field of engine tail gas aftertreatment.

Background

With the increasing emission standards of internal combustion automobiles, in order to reduce harmful substances such as nitrogen oxides in exhaust gas, a post-treatment technology generally adopted in the industry is Selective Catalytic Reduction (SCR), and urea solution is injected into the exhaust gas upstream of the SCR. The urea solution is hydrolyzed and pyrolyzed to generate ammonia gas, and the ammonia gas and the nitrogen oxide compound react chemically, so that the concentration of harmful substances is reduced.

Urea injection systems currently on the market generally include air assist systems and non-air assist systems. Of course, either system includes a urea tank assembly, a pump supply unit connected to the urea tank assembly by a low pressure line, a nozzle module connected to the pump supply unit by a high pressure line, and a controller. The pump supply unit includes a urea pump, a pressure sensor, and the like, and the nozzle module includes a urea nozzle and the like. The urea pump is spaced from the urea nozzle by a relatively long distance and is connected through a urea pipe. In addition, the existing urea injection system comprises more parts, is complex to install and has high cost.

Therefore, a new technical solution is needed.

Disclosure of Invention

The invention aims to provide an integrated device with relatively accurate control, an exhaust aftertreatment system and a control method.

In order to achieve the above purpose, the invention adopts the following technical scheme:

an integrated pump and nozzle arrangement, wherein the pump is configured to pump a fluid medium to the nozzle, the nozzle configured to inject the fluid medium into an exhaust of an engine, the integrated arrangement comprising a pump assembly and a nozzle assembly; the pump assembly comprising a pump assembly housing and the pump cooperating with the pump assembly housing, the pump assembly housing comprising an inlet passage upstream of and in communication with the pump and an outlet passage downstream of and in communication with the pump, the outlet passage in communication with the nozzle assembly, the pump assembly housing comprising a housing and a first housing below the housing, the housing being provided with a housing cavity, the inlet passage being located within the first housing; the pump assembly includes a motor coil to drive the pump, a magnetic body to interact with the motor coil, and first and second intermeshing gear assemblies, wherein the motor coil is interference fit within the housing cavity, the first gear assembly includes a first gear shaft and a first gear, the second gear assembly includes a second gear shaft and a second gear, the first gear intermeshes with the second gear; the nozzle assembly comprises a nozzle assembly shell and the nozzle matched with the nozzle assembly shell, and further comprises a nozzle coil used for driving the nozzle, wherein the motor coil and the nozzle coil are controlled independently.

As a further improved technical scheme of the invention, the pump is a urea pump, the nozzle is a urea nozzle, and the fluid medium is urea solution.

As a further improved technical scheme of the invention, the pump is a fuel pump, the nozzle is a fuel nozzle, and the fluid medium is fuel.

As a further improved technical scheme of the invention, the integrated device comprises a controller connected with the motor coil and the nozzle coil, and the controller is used for independently controlling the urea pump and the urea nozzle respectively.

As a further development of the invention, the integrated device comprises a pressure sensor in communication with the outlet channel and an overflow element connected between the outlet channel and the inlet channel.

As a further development of the invention, the integrated device comprises a temperature sensor mounted in the pump assembly housing.

As a further improved technical scheme of the invention, the pump assembly comprises a metal cover for accommodating the magnetic body, and the motor coil is sleeved on the periphery of the metal cover; the first gear shaft is a driving shaft, the second gear shaft is a driven shaft, and the first gear shaft is higher than the second gear shaft.

As a further development of the invention, the pump assembly further comprises an elastomer housed within the metal cap and located below the magnetic body, the elastomer being compressible to absorb the expansion volume generated by urea ice formation.

As a further improved technical scheme of the invention, the pump assembly shell is provided with a gear groove for accommodating the first gear and the second gear, the first gear is externally meshed with the second gear, one side of the gear groove is provided with a liquid inlet cavity communicated with the inlet channel, and the other side of the gear groove is provided with a liquid outlet cavity communicated with the outlet channel.

As a further development of the invention, the nozzle assembly comprises a magnetic part interacting with the nozzle coil, a valve needle part located below the magnetic part, a spring acting between the magnetic part and the valve needle part, and a valve seat cooperating with the valve needle part.

As a further improved technical scheme of the invention, the nozzle coil is positioned at the periphery of the magnetic part, the valve needle part is provided with a valve needle, and the valve seat is provided with an injection hole matched with the valve needle.

As a further improved technical scheme of the invention, the valve seat comprises a swirl plate welded on the nozzle assembly shell, the jet hole is arranged on the swirl plate, and the swirl plate is also provided with a plurality of swirl grooves communicated with the jet hole.

As a further development of the invention, the integrated device is provided with a cooling assembly for cooling the urea nozzle, which cooling assembly cools the urea nozzle by means of a cooling medium.

As a further improved technical scheme of the invention, the controller is provided with a control board, the motor coil and the nozzle coil are electrically connected with the control board, and the housing is provided with a through hole communicated with the housing cavity and a waterproof and breathable cover fixed in the through hole; the control panel is welded with a flat cable plug which is exposed out of the housing.

As a further improved technical solution of the present invention, the casing is connected with the first housing by a bolt, and the pump assembly housing is provided with a support column for the bolt to pass through and for supporting the control board.

As a further improved technical scheme of the invention, the pump assembly shell is provided with a connecting plate assembly matched with the first shell, the connecting plate assembly comprises a plate part and a metal cover which is fixed on the plate part and protrudes upwards, the magnetic body is contained in the metal cover, the motor coil is sleeved on the periphery of the metal cover, and the plate part is fixed on the first shell through a plurality of screws.

As a further improved technical scheme of the invention, the first shell comprises a first upper surface, a first lower surface and a first side surface, wherein the first upper surface is provided with a first annular groove, a first island part surrounded by the first annular groove and a first sealing ring accommodated in the first annular groove, the first sealing ring is positioned below the metal cover, and the sheet part is pressed against the first sealing ring downwards; the urea pump comprises a first shaft sleeve and a second shaft sleeve, wherein the first shaft sleeve is accommodated in the first positioning hole, the second shaft sleeve is accommodated in the second positioning hole, the first gear shaft is inserted into the first shaft sleeve, and the second gear shaft is inserted into the second shaft sleeve.

As a further improved technical scheme of the invention, the first lower surface is provided with a first load discharging groove which is communicated with the first positioning hole and the second positioning hole.

As a further improved technical scheme of the invention, the first island part further comprises a first diversion trench penetrating through the first upper surface and communicated with the second positioning hole and a first connecting hole penetrating through the first upper surface and communicated with the inlet channel; the first shell is provided with a second connecting hole penetrating through the first lower surface and communicated with the liquid inlet cavity, and an outlet hole penetrating through the first lower surface and communicated with the liquid outlet cavity.

As a further improved technical scheme of the invention, the first shell is further provided with a containing cavity penetrating downwards through the first lower surface, and the containing cavity is used for containing at least part of the nozzle assembly.

As a further improved technical scheme of the invention, the first upper surface is also provided with a pressure sensor accommodating hole which is positioned beside the first island part and is used for accommodating a pressure sensor, and the accommodating cavity is communicated with the pressure sensor accommodating hole.

As a further improved technical scheme of the invention, the first shell is provided with an overflow element accommodating groove communicated with the outlet hole, and the integrated device is provided with an overflow element arranged in the overflow element accommodating groove; when the pressure of the outlet channel is higher than the set value, the overflow element opens to return part of the urea solution into the inlet channel.

As a further improved technical scheme of the invention, the pump assembly housing comprises a second housing which is positioned below the first housing and connected with the first housing, the second housing comprises a second upper surface and a second lower surface, and the gear groove penetrates through the second upper surface and the second lower surface.

As a further improved technical scheme of the invention, the pump assembly housing comprises a third housing which is positioned below the second housing and is connected with the second housing, the third housing comprises a body part and a protruding part which extends downwards from the body part, wherein the body part is provided with a third upper surface, the third upper surface is provided with a third annular groove and a third island part surrounded by the third annular groove, the third island part is provided with a third positioning hole and a fourth positioning hole which penetrate through the third upper surface, and the third positioning hole and the fourth positioning hole extend into the protruding part; the urea pump comprises a third shaft sleeve and a fourth shaft sleeve, wherein the third shaft sleeve is accommodated in the third positioning hole, the fourth shaft sleeve is accommodated in the fourth positioning hole, the first gear shaft is inserted into the third shaft sleeve, and the second gear shaft is inserted into the fourth shaft sleeve.

As a further improved technical scheme of the invention, the third island part is provided with a second diversion trench and a third diversion trench penetrating through the third upper surface, wherein the second diversion trench is communicated with the third positioning hole, and the third diversion trench is communicated with the fourth positioning hole.

As a further improved technical scheme of the invention, the nozzle assembly shell comprises a main body part and an extension part extending downwards from the main body part, wherein the main body part is provided with a containing cavity for containing the urea nozzle and a groove for containing the protruding part, and the containing cavity extends downwards into the extension part.

As a further improved technical scheme of the invention, the pump assembly shell and the nozzle assembly shell are fixed together from bottom to top through a plurality of fixing bolts.

As a further improved technical scheme of the invention, the nozzle assembly comprises a magnetic part interacted with the nozzle coil, a valve needle part connected with the magnetic part and a spring acting on the valve needle part; the extension part is provided with a current collecting cavity communicated with the accommodating cavity, wherein the part, protruding out of the second upper surface, of the magnetic part is accommodated in the accommodating cavity.

As a further improved technical scheme of the invention, the spring is arranged in the magnetic part and the valve needle part, the valve needle part is provided with a conical part and a valve needle extending downwards from the conical part, the valve needle extends into the collecting cavity, the magnetic part is provided with a first communication hole communicated with the accommodating cavity, the valve needle part is provided with a second communication hole communicated with the first communication hole, and the conical part is provided with a third communication hole communicated with the second communication hole and the collecting cavity.

As a further improved technical scheme of the invention, the nozzle assembly comprises a valve seat matched with the valve needle, the valve seat comprises a swirl plate welded on the extension part, the swirl plate is provided with an injection hole matched with the valve needle and a plurality of swirl grooves communicated with the injection hole, and the swirl grooves are communicated with the manifold.

According to the technical scheme of the invention, the nozzle assembly shell is provided with a first cooling channel, a second cooling channel arranged at intervals with the first cooling channel and an end cover sealed at the periphery of the extension part, an annular cooling groove communicated with the first cooling channel and the second cooling channel is formed between the end cover and the extension part, the first cooling channel is connected with an inlet joint for injecting engine cooling liquid, and the second cooling channel is connected with an outlet joint for discharging the engine cooling liquid.

The invention also discloses the following technical scheme:

an exhaust aftertreatment system comprising an injection system for exhaust aftertreatment and an encapsulation system for exhaust aftertreatment, wherein the injection system comprises the aforementioned integrated device and the encapsulation system comprises a carrier downstream of the integrated device.

As a further development of the invention, the carrier comprises a selective catalytic reduction and the encapsulation system further comprises at least one mixer between the integrated device and the carrier.

The invention also discloses the following technical scheme:

a control method of an integrated device, the integrated device being the aforementioned integrated device, the control method comprising:

driving the pump in operation, drawing the fluid medium into the pump through the inlet passage;

delivering the fluid medium to the nozzle through the outlet passage after pressurization by the pump;

energizing the nozzle coil when an injection condition is reached, at least partially opening the nozzle to inject the fluid medium into the exhaust of the engine; wherein:

the motor coil and the nozzle coil are respectively and independently controlled.

Compared with the prior art, the pump and nozzle integrated device well integrates the pump and the nozzle, has a simple and compact structure, and is greatly convenient for customers to install. In addition, through respectively carrying out independent control to motor coil and nozzle coil to avoid the mutual interference between pump and the nozzle, improved the accuracy of control. On the basis that the integrated device integrates the urea pump and the urea nozzle, due to the improvement of control precision, the amount of urea sprayed into exhaust gas and the nitrogen oxide compound can reach a proper proportion, and the crystallization risk caused by excessive urea spraying is reduced. In addition, through with motor coil interference fit in the housing cavity, reduced the quantity of part, be convenient for the equipment of both.

Drawings

FIG. 1 is a schematic diagram of an exhaust aftertreatment system of the present disclosure as applied to treating engine exhaust.

Fig. 2 is a schematic diagram of the integrated device of fig. 1.

Fig. 3 is a schematic perspective view of an integrated device of the present invention in one embodiment.

Fig. 4 is a schematic perspective view of another angle of fig. 3.

Fig. 5 is a schematic perspective view of the further angle of fig. 3.

Fig. 6 is a front view of fig. 3.

Fig. 7 is a right side view of fig. 3.

Fig. 8 is a bottom view of fig. 5.

Fig. 9 is a top view of fig. 5.

FIG. 10 is a partially exploded perspective view of the integrated device of the present invention with the pump assembly separated from the nozzle assembly.

Fig. 11 is a partially exploded perspective view of the pump assembly of fig. 10 with the housing, motor coil, and waterproof and breathable cover separated.

Fig. 12 is a perspective view of the housing of fig. 11 assembled with a motor coil.

Fig. 13 is an exploded perspective view of fig. 12.

Fig. 14 is a further exploded perspective view of fig. 11 with the control panel separated.

Fig. 15 is an exploded perspective view of the cover and control panel of fig. 14 removed with the web assembly separated.

Fig. 16 is a perspective view of the web assembly of fig. 15.

Fig. 17 is an exploded perspective view of the web assembly of fig. 15.

Fig. 18 is a further exploded perspective view of fig. 15, with the magnetic body, elastomer and screw separated.

Fig. 19 is a further exploded perspective view of fig. 18 with the first seal ring, temperature sensor and pressure sensor separated.

Fig. 20 is an exploded perspective view of the magnetic body, the elastic body, the screw, and the like in fig. 19.

Fig. 21 is a schematic cross-sectional view of fig. 20 taken at an angle after assembly.

Fig. 22 is a schematic perspective view of the pressure sensor of fig. 19.

Fig. 23 is a schematic perspective view of another angle of fig. 22.

Fig. 24 is an exploded perspective view of fig. 22.

Fig. 25 is a schematic cross-sectional view taken along line C-C in fig. 22.

Fig. 26 is a partially exploded perspective view of the first seal ring, the temperature sensor, the pressure sensor, etc. of fig. 19, with the first housing separated.

Fig. 27 is an exploded perspective view of the first housing of fig. 26.

Fig. 28 is an exploded perspective view of fig. 27 at another angle.

Fig. 29 is a perspective view of a portion of the first housing of fig. 27.

Fig. 30 is a perspective view of fig. 29 at another angle.

Fig. 31 is a top view of fig. 30.

Fig. 32 is a schematic cross-sectional view taken along line D-D in fig. 31.

Fig. 33 is a schematic cross-sectional view taken along line E-E in fig. 31.

Fig. 34 is a schematic cross-sectional view taken along line F-F in fig. 31.

Fig. 35 is a top view of fig. 29.

Fig. 36 is a schematic cross-sectional view taken along line G-G in fig. 35.

Fig. 37 is a schematic cross-sectional view taken along line H-H in fig. 35.

Fig. 38 is a schematic cross-sectional view taken along line I-I in fig. 35.

Fig. 39 is a perspective view of the first housing of fig. 26 removed.

Fig. 40 is a partially exploded perspective view of fig. 39 with the first gear assembly and the second gear assembly separated.

Fig. 41 is a top view of fig. 39.

Fig. 42 is an exploded perspective view of the first and second gear assemblies of fig. 40 removed.

Fig. 43 is a perspective view of the second housing of fig. 42.

Fig. 44 is a schematic perspective view of another angle of fig. 43.

Fig. 45 is a schematic perspective view of the third housing assembly of fig. 42.

Fig. 46 is a top view of fig. 45.

Fig. 47 is a schematic cross-sectional view taken along line J-J of fig. 46.

Fig. 48 is a schematic cross-sectional view taken along line K-K in fig. 46.

FIG. 49 is a partially exploded perspective view of the nozzle assembly of the present invention.

FIG. 50 is a partially exploded perspective view of the urea nozzle of FIG. 49.

FIG. 51 is a schematic perspective view of the nozzle assembly housing of FIG. 49.

Fig. 52 is a partially exploded perspective view of fig. 51.

FIG. 53 is a top view of a portion of the nozzle assembly housing of FIG. 52.

Fig. 54 is a schematic cross-sectional view taken along line L-L in fig. 53.

Fig. 55 is a schematic cross-sectional view taken along line M-M in fig. 54.

Fig. 56 is a schematic cross-sectional view taken along line N-N in fig. 54.

Fig. 57 is a perspective view of the other angle of fig. 53.

Fig. 58 is an exploded perspective view of the integrated device of the present invention.

Fig. 59 is a schematic cross-sectional view taken along line A-A in fig. 9.

Fig. 60 is a schematic cross-sectional view taken along line O-O in fig. 59.

Fig. 61 is a schematic cross-sectional view taken along line P-P in fig. 59.

Fig. 62 is a schematic cross-sectional view taken along line Q-Q in fig. 60.

Fig. 63 is a schematic cross-sectional view taken along the line R-R in fig. 61.

Fig. 64 is a schematic cross-sectional view taken along line B-B of fig. 9.

Fig. 65 is a schematic cross-sectional view taken along line S-S in fig. 64.

Detailed Description

Referring to FIG. 1, an exhaust aftertreatment system 100 is disclosed that can be used to treat the exhaust of an engine 10 to reduce emissions of harmful substances to meet emissions regulations. The exhaust aftertreatment system 100 comprises an injection system 200 for exhaust aftertreatment and an encapsulation system 300 for exhaust aftertreatment, wherein the injection system 200 comprises an integrated device 1 for pumping urea solution (indicated by reference arrow X) from a urea tank 201 and injecting urea solution into the exhaust gas of the engine 10 (e.g. into an exhaust pipe 106 or into the encapsulation system 300); the encapsulation system 300 comprises a mixer 301 downstream of the integrated device 1 and a carrier 302 downstream of the mixer 301. Of course, in some embodiments, no mixer or two or more mixers may be provided. The support 302 may be, for example, a Selective Catalytic Reduction (SCR) or the like.

The engine 10 has an engine coolant circulation circuit. Referring to fig. 1, in the illustrated embodiment of the invention, the engine coolant circulation circuit includes a first circulation circuit 101 (shown by reference thick arrow Y) and a second circulation circuit 102 (shown by reference thin arrow Z), wherein the first circulation circuit 101 is configured to cool the integrated device 1 to reduce the risk of burnout by high temperature engine exhaust; the second circulation loop 102 is used for heating the urea tank 201 to realize a heating and thawing function. It will be appreciated that in the first circulation circuit 101, the integrated device 1 is provided with an inlet connection 103 for the inflow of engine coolant and an outlet connection 104 for the outflow of engine coolant; in the second circulation circuit 102, a control valve 105 is provided to open or close the control valve 105 under appropriate conditions, enabling control of the second circulation circuit 102. The urea tank 201 is provided with a heating rod 202 connected to the second circulation circuit 102, so as to heat and defrost the urea solution by using the temperature of the engine coolant.

The integrated device 1 of the present invention is described in detail below.

Referring to fig. 2, the integrated device 1 of the present invention integrates the functions of a urea pump 11 and a urea nozzle 12 in principle. The urea pump 11 includes, but is not limited to, a gear pump, a diaphragm pump, a plunger pump, a vane pump, or the like. It should be understood that the term "integrated" as used herein means that the urea pump 11 and the urea nozzle 12 can be mounted on the exhaust pipe as a single unit; or the urea pump 11 and the urea nozzle 12 are close to each other and connected by a short connecting pipe, which can be regarded as one device as a whole.

In addition, the exhaust gas aftertreatment system 100 of the present invention is also provided with a controller 13 for independent control of the urea pump 11 and the urea nozzle 12. It will be appreciated that the controller 13 may be integrated with the integrated device 1 or may be provided separately from the integrated device 1. Referring to fig. 2, in the illustrated embodiment of the present invention, the controller 13 is integrated in the integrated device 1, so as to achieve high integration of components and improve convenience in installation of clients.

The integrated device 1 is provided with a housing 14 for accommodating the urea pump 11 and the urea nozzle 12. The embodiment shown in fig. 2 is only a rough representation of the housing 14. For example, in one embodiment, the housing 14 is shared by the urea pump 11 and the urea nozzle 12; in another embodiment, the housing 14 is divided into a first housing that cooperates with the urea pump 11 and a second housing that cooperates with the urea nozzle 12, the first housing and the second housing being assembled together to form a single unit. The housing 14 is provided with an inlet channel 15 connected between the urea tank 201 and the urea pump 11 and an outlet channel 16 connected between the urea pump 11 and the urea nozzle 12. The terms "inlet" in the "inlet passage 15" and "outlet" in the "outlet passage 16" are used herein with reference to the urea pump 11, that is, the upstream of the urea pump 11 is the inlet, and the downstream of the urea pump 11 is the outlet. The outlet channel 16 communicates with the urea nozzle 12 to pump urea solution to the urea nozzle 12. It will be appreciated that the inlet passage 15 is located upstream of the urea pump 11 and is a low pressure passage; the outlet channel 16 is located downstream of the urea pump 11 and is a high pressure channel.

In addition, the integrated device 1 is provided with a temperature sensor 171 for detecting temperature. The temperature sensor 171 may be provided in communication with the inlet passage 15 and/or the outlet passage 16; or the temperature sensor 171 may be provided to be mounted at an arbitrary position of the integrated device 1. The signal detected by the temperature sensor 171 is transmitted to the controller 13, and the controller 13 can improve the injection accuracy of the urea nozzle 12 by using a control algorithm designed based on the input signal and other signals. The integrated device 1 is further provided with a pressure sensor 172 for detecting pressure, which pressure sensor 172 communicates with the outlet channel 16 for detecting the pressure in the high pressure channel at the outlet of the urea pump 11. Due to the integrated design of the present invention, the distance of the internal channels is relatively short, so the pressure sensor 172 can be considered to be located relatively close to the urea nozzle 12. The advantage of this design is that the pressure measured by pressure sensor 172 is relatively close to the pressure in urea nozzle 12, improving the accuracy of the data and thus the accuracy of the injection of urea nozzle 12.

Referring to fig. 2, the integrated device 1 is further provided with an overflow element 173 connected between the outlet channel 16 and the inlet channel 15. The relief member 173 includes, but is not limited to, a relief valve, a safety valve, an electrically controlled valve, etc. The function of the overflow element 173 is to open the overflow element 173 when the pressure in the high pressure channel is higher than a set value, to release the urea solution located in the high pressure channel into the low pressure channel or directly back into the urea tank 201 for pressure regulation.

For driving the urea pump 11, the urea pump 11 is provided with a motor coil 111 in communication with the controller 13. For driving the urea nozzle 12, the urea nozzle 12 is provided with a nozzle coil 121 in communication with the controller 13.

The controller 13 communicates with the temperature sensor 171 and the pressure sensor 172 to transmit temperature signals and pressure signals to the controller 13. Of course, to enable accurate control, the controller 13 may also receive other signals, such as signals from the CAN bus relating to engine operating parameters. The controller 13 can also obtain the rotational speed of the urea pump 11, although the acquisition of the rotational speed signal can be effected by means of a corresponding rotational speed sensor 175 (hardware) or by means of a control algorithm (software). The controller 13 controls the urea pump 11 and the urea nozzle 12 independently. The advantage of this control is that the effect of the action of the urea pump 11 on the urea nozzle 12 can be reduced to achieve a relatively high control accuracy.

In addition, under certain conditions, the urea nozzle 12 needs to be cooled because the exhaust gas of the engine has a relatively high temperature and the urea nozzle 12 is mounted on the exhaust pipe. For this purpose, the integrated device 1 is further provided with a cooling module which cools the urea nozzle 12 by means of a cooling medium. The cooling medium includes, but is not limited to, air, and/or engine coolant, and/or lubricating oil, and/or urea, etc. Referring to FIG. 2, the illustrated embodiment of the present invention employs water cooling, i.e., cooling of urea nozzle 12 with engine coolant. The casing 14 is provided with a cooling passage 141 through which an engine coolant flows.

Referring to fig. 2, the main operation principle of the integrated device 1 is as follows:

the controller 13 drives the urea pump 11 to operate, and urea solution in the urea tank 201 is sucked into the urea pump 11 through the inlet channel 15, pressurized and then delivered to the urea nozzle 12 through the outlet channel 16. Wherein the controller 13 collects and/or calculates the required signals, such as temperature, pressure, pump speed, etc. When the injection conditions are reached, the controller 13 sends a control signal to the urea nozzle 12, for example energizing the nozzle coil 121, and urea injection is achieved by controlling the movement of the valve needle. The controller 13 sends a control signal to the urea pump 11 to control its rotational speed, thereby stabilizing the pressure of the system. In the illustrated embodiment of the invention, the controller 13 controls the urea pump 11 and the urea nozzle 12 independently.

Referring to fig. 3 to 65, in the illustrated embodiment of the present invention, the integrated device 1 includes a pump assembly 18, a nozzle assembly 19, and a controller 13. Referring to fig. 10, the nozzle assembly 19 is at least partially inserted into the pump assembly 18 and assembled together by a plurality of fixing bolts 64.

Referring to fig. 3-10, in the illustrated embodiment of the invention, the pump assembly 18 includes a pump assembly housing 180 and a urea pump 11 mated with the pump assembly housing 180. The pump assembly housing 180 includes a casing 2 at the top, and first, second, and third housings 3, 4, 5 below the casing 2 and stacked together. In the illustrated embodiment of the present invention, the first housing 3, the second housing 4, and the third housing 5 are all made of a metal material.

Referring to fig. 11 and 12, the housing 2 includes a housing cavity 21 for covering the controller 13 and at least part of the pump assembly 18, a through hole 22 communicating with the housing cavity 21, a plurality of first mounting holes 23 at the periphery, and a waterproof and breathable cover 24 fixed in the through hole 22. The controller 13 is provided with a chip and other electronic components, which generate heat during operation to cause air expansion around the controller, and the waterproof ventilation cover 24 well solves the problem of crushing the chip and/or the electronic components due to air expansion, and can also play a role in waterproof. In addition, the waterproof and breathable cover 24 can improve the environment in which the controller 13 is located, so that the controller can meet the working conditions. In the illustrated embodiment of the present invention, the housing 2 is made of a metal material having a good heat dissipation effect in order to improve heat dissipation performance. In addition, the housing 2 may be further provided with a plurality of heat radiating fins (not shown) located at the outside to enhance the heat radiating effect.

Referring to fig. 11 and 14, the controller 13 includes a control board 131 and a flat cable plug 132 welded to the control board 131. The flat cable plug 132 passes through the housing 2 to be exposed to the outside for connection with an external circuit. In the illustrated embodiment of the invention, the control plate 131 is annular in shape and has a central opening 135 in the middle. The pump assembly 18 is also provided with a number of support columns 631 mounted on the first housing 3 for supporting the control panel 131.

Referring to fig. 11 and 14-19, the pump assembly housing 180 is further provided with a connection plate assembly 6 between the casing 2 and the first housing 3. Specifically, the connection plate assembly 6 is provided with a plate portion 61 and a metal cover 62 fixed to the plate portion 61 and protruding upward. The metal cover 62 passes upwardly through the central aperture 135 of the control plate 131. Referring to fig. 11, the control board 131 is clamped by the support column 631 and the housing 2 together, and forms a gap with the connecting board assembly 6, so as to facilitate better heat dissipation and better interference avoidance of the control board 131.

As shown in fig. 16, the plate 61 has a through hole 614, a first threading hole 618, and a through hole 615 penetrating the upper and lower surfaces thereof. Referring to fig. 14, the pressure sensor 172 at least partially penetrates through the through hole 614, and the temperature sensor 171 at least partially penetrates through the through hole 615. The conductive wire 1721 of the pressure sensor 172 passes through the through hole 614, the conductive wire 124 of the nozzle assembly 19 passes through the first threading hole 618, and the conductive wire 1711 of the temperature sensor 171 passes through the through hole 615, and is electrically connected to the control board 131. Further, referring to fig. 15, the plate 61 is provided with a plurality of mounting holes 611 through which screws 133 pass. Referring to fig. 17, the plate portion 61 is provided with a through hole 617 corresponding to the metal cap 62. In the illustrated embodiment of the invention, the lower end of the metal cap 62 is welded to the inner wall of the through hole 617.

In the illustrated embodiment of the invention, the urea pump 11 is a gear pump comprising a motor coil 111, the metal cover 62, an elastomer 71 and a magnetic body 72 located within the metal cover 62, a first seal 73 located below the metal cover 62, and a first gear assembly 74 and a second gear assembly 75 that intermesh. The gear pump is advantageous for increasing the flow rate of the urea nozzle 12, since it is able to build up a relatively large operating pressure. In addition, the gear pump can also be reversed, so that residual urea solution is pumped out, and the risk of urea crystallization is reduced. Referring to fig. 12 and 13, the motor coil 111 is provided with a bracket 112 and a coil 113 wound around the bracket 112. The bracket 112 is provided with a hole 114 for receiving the metal cover 62. In the illustrated embodiment of the invention, the motor coil 111 is interference fit within the housing cavity 21, so that the motor coil 111 can be formed as a single piece with the housing cavity 21 without the use of additional fixing elements (e.g., screws, etc.), thereby reducing the number of parts. Referring to fig. 20 and 21, the urea pump 11 further includes an outer sleeve 723 for accommodating the magnetic body 72, and the outer sleeve 723 is directly accommodated in the metal cap 62.

Referring to fig. 59, the motor coil 111 is sleeved on the outer periphery of the metal cover 62. The plate portion 61 presses down on the first seal ring 73 to seal. In the illustrated embodiment of the present invention, the elastic body 71 is located at the lower end of the magnetic body 72, and the elastic body 71 and the magnetic body 72 are supported together by one metal frame 720, for example, the magnetic body 72 and the elastic body 71 are respectively sleeved at the upper and lower ends of the metal frame 720. The metal frame 720 is provided with a partition plate 721 located between the elastic body 71 and the magnetic body 72. The metal frame 720 has a hollow cylindrical shape as a whole, except for the partition plate 721, and the first gear assembly 74 is at least partially housed in the metal frame 720 (see fig. 59). In order to better limit the elastic body 71, a hook portion 724 that abuts against the elastic body 71 is disposed at the end of the metal skeleton 720. The hook 724 is provided with a guiding tapered surface 725 for easily sleeving the elastic body 71 on the metal frame 720. The elastic body 71 is provided with a radially extending assembly hole 711, the metal skeleton 720 is provided with a fixing hole 726 corresponding to the assembly hole 711, and the upper end of the first gear assembly 74 is radially fixed with the metal skeleton 720 by a screw 722 installed in the assembly hole 711 and the fixing hole 726. With this arrangement, axial play of the first gear assembly 74 is prevented, and stability of the gear pump operation is improved. It is well known that urea solutions expand in volume after freezing. By providing the elastomer 71, the elastomer 71 can be compressed to absorb this expanded volume, thereby avoiding damage to other components due to volume expansion.

Referring to fig. 22 to 25, in the illustrated embodiment of the invention, the pressure sensor 172 includes a substrate 176, a circuit board 177 fixed on the substrate 176, a conductive wire 1721 connected to the circuit board 177, and a protective cover 178 fastened on the circuit board 177. Wherein the base plate 176 is provided with a plate body 1761 and a boss 1762 extending downward from the plate body 1761, and a seal 1722 is mounted on the boss 1762. The boss 1762 is provided with a through hole 1763 extending downwardly therethrough, and the through hole 1763 extends upwardly through the plate body 1761 and the circuit board 177. The circuit board 177 is provided with a chip 1771 at a position corresponding to the through hole 1763. The protective cover 178 is mounted on the periphery of the chip 1771 to protect the chip 1771. In the illustrated embodiment of the present invention, the protective cover 178 has a rectangular parallelepiped shape, and the protective cover 178 is provided with a hole 1781 communicating with the chip 1771. As shown in fig. 25 and 59, unlike the pressure sensor in the prior art, the pressure sensor 172 of the present invention does not have a separate package case, but skillfully uses the housing 2 as its package case. By the arrangement, the volume can be reduced, the installation is convenient, the cost is reduced, and the like. In the illustrated embodiment of the invention, the pressure sensor 172 is a differential pressure sensor that converts differential pressure across the upper and lower ends of the chip 1771 into an electrical signal. In view of the fact that the operation principle of the differential pressure sensor is a technology well known to those skilled in the art, the description thereof is omitted here.

Referring to fig. 26 to 48, in the illustrated embodiment of the present invention, the first housing 3, the second housing 4 and the third housing 5 are machined parts and are fixed together from top to bottom by bolts 66. The first housing 3 comprises a first upper surface 31, a first lower surface 32 and a first side surface 33, wherein the first upper surface 31 is provided with a first annular groove 311 and a first island 312 surrounded by the first annular groove 311. The first annular groove 311 is configured to receive the first seal ring 73. The first lower surface 32 is provided with a second annular groove 325 and a second island 326 surrounded by the second annular groove 325. The second annular groove 325 is configured to receive a second seal 731 (as shown in fig. 64).

The first island 312 is provided with a first positioning hole 3121 penetrating the first upper surface 31 and the first lower surface 32, a second positioning hole 3122 penetrating the first lower surface 32, a first connection hole 3123 penetrating the first upper surface 31 and communicating with the inlet channel 15, and a first diversion trench 3124 penetrating the first upper surface 31 and communicating with the second positioning hole 3122. Referring to fig. 27, 28 and 59, the urea pump 11 includes a first sleeve 76 received in the first positioning hole 3121 and a second sleeve 77 received in the second positioning hole 3122. In addition, the first housing 3 further includes an internally threaded hole 317 corresponding to the screw 133. When assembled, the screws 133 are screwed into the internally threaded holes 317 after passing through the mounting holes 611 of the plate portion 61 to fix the connection plate assembly 6. The first housing 3 further includes a plurality of first assembly holes 318 through which the bolts 66 pass, and the first assembly holes 318 penetrate the first upper surface 31 and the first lower surface 32. The first upper surface 31 is further provided with a pressure sensor receiving hole 313 located beside the first island 312 for receiving the pressure sensor 172 and a temperature sensor receiving hole 314 for receiving the temperature sensor 171. Referring to fig. 59, a sealing ring 1722 on the pressure sensor 172 seals against the inner wall of the pressure sensor receiving hole 313. The pressure sensor 172 is pressed by the plate portion 61 to achieve fixation. In addition, the first housing 3 is further provided with an outwardly protruding mounting flange 315, the mounting flange 315 being provided with a second mounting hole 316 corresponding to the first mounting hole 23. In assembly, bolts 63 are sequentially passed through second mounting holes 316 and support columns 631 and tightened in the internal threads of first mounting holes 23. With this arrangement, the first housing 3 and the casing 2 can be fixed, and the control board 131 (see fig. 59) can be clamped.

In addition, referring to fig. 30, the first housing 3 is provided with a liquid inlet channel 332 penetrating the first side surface 33 to connect with the urea joint 331. The first housing 3 is provided with a second connection hole 3127 penetrating the first lower surface 32 and communicating with the liquid inlet channel 332. The first and second connection holes 3123 and 3127 are perpendicular to the liquid inlet channel 332. The first positioning hole 3121, the second positioning hole 3122, and the second connection hole 3127 each penetrate the second island 326 downward. The second island 326 is further provided with an outlet aperture 3126 through the first lower surface 32. The first lower surface 32 is provided with a first relief groove 321 communicating the first positioning hole 3121 and the second positioning hole 3122 to ensure pressure balance. The first relief groove 321 is located on the second island 326. In addition, the first housing 3 is further provided with a receiving cavity 322 penetrating downward through the first lower surface 32 for receiving at least part of the nozzle assembly 19. Referring to fig. 33, 34 and 36, the accommodating cavity 322 communicates with the pressure sensor accommodating hole 313. At the same time, the receiving chamber 322 also communicates with the outlet aperture 3126. Referring to fig. 32 and 33, in the illustrated embodiment of the invention, the outlet aperture 3126 is inclined inside the first housing 3, having a substantially inverted V-shape. The first housing 3 is provided with a second threading hole 323 corresponding to the first threading hole 618.

Further, referring to fig. 38, 64 and 65, the first housing 3 further includes an overflow element accommodating groove 319 communicating with the liquid inlet passage 332 and the accommodating chamber 322. The overflow element receiving slot 319 extends outwardly through the first side 33 to receive the overflow element 173. The overflow element 173 is in the embodiment shown in the present invention a safety valve, the purpose of which is to ensure that the pressure in the high-pressure channel in the integrated device 1 is within a safety value range by means of pressure relief. For fixing the overflow element 173, the first housing 3 is provided with a plug 5122 for fixing the overflow element 173. Referring to fig. 65, the overflow member 173 is provided with trickle holes 1731 which always communicate with the inlet channel 15 and the outlet channel 16. So configured, on the one hand, pressure fluctuations of the system can be reduced, especially when the nozzle assembly 19 is injecting urea; on the other hand, the urea solution can be kept flowing, thereby facilitating heat dissipation of the motor coil 111 and the like.

Referring to fig. 1, the urea joint 331 is in communication with the urea tank 201 through a urea connection pipe 333. In order to better implement the heating and thawing function, the exhaust gas aftertreatment system 100 may further be provided with a heating device 334 for heating the urea connection pipe 333. Referring to fig. 22 and 29, in the illustrated embodiment of the invention, the liquid inlet channel 332 extends horizontally into the first housing 3. Of course, in other embodiments, the inlet channel 332 may be angled.

Referring to fig. 39 to 41, the first gear assembly 74 includes a first gear shaft 741 and a first gear 742 fixed to the first gear shaft 741; the second gear assembly 75 includes a second gear shaft 751 and a second gear 752 fixed to the second gear shaft 751, the first gear 742 intermeshes with the second gear 752. Referring to fig. 34, in the illustrated embodiment of the invention, the first gear 742 is in external engagement with the second gear 752. The first gear shaft 741 is a driving shaft, the second gear shaft 751 is a driven shaft, and the first gear shaft 741 is higher than the second gear shaft 751. The upper end of the first gear shaft 741 passes through the first sleeve 76 and is at least partially fixed in the metal skeleton 720. The upper end of the second gear shaft 751 is positioned in the second sleeve 77. When the motor coil 111 is energized, it interacts with the magnetic body 72, and the electromagnetic force drives the first gear shaft 741 to rotate, and thereby the first gear 742 and the second gear 752 to rotate.

The second housing 4 is located below the first housing 3 and is connected to the first housing 3. In addition, for better positioning, a plurality of positioning pins 328 are further disposed between the first housing 3 and the second housing 4. The second housing 4 includes a second upper surface 41, a second lower surface 42, and a gear groove 43 penetrating the second upper surface 41 and the second lower surface 42 and configured to receive the first gear 742 and the second gear 752. One side of the gear groove 43 is provided with a liquid inlet cavity 431 communicated with the inlet channel 15, and the other side of the gear groove 43 is provided with a liquid outlet cavity 432 communicated with the outlet channel 16. Specifically, the liquid inlet chamber 431 communicates with the second connection hole 3127, and the upper end of the liquid outlet chamber 432 communicates with the outlet hole 3126. In addition, the second upper surface 41 of the second housing 4 is provided with a first receiving hole 411 through which the nozzle assembly 19 passes, and the second lower surface 42 is provided with a second receiving hole 421 for positioning the nozzle assembly 19, the second receiving hole 421 being larger than the first receiving hole 411 to form a stepped hole. The nozzle assembly 19 protrudes upwardly from the second upper surface 41 and is received in the receiving cavity 322. So configured, high pressure urea solution can be delivered to urea nozzle 12. In addition, the second upper surface 41 is further provided with a third threading hole 412 corresponding to the second threading hole 323. The first through hole 618, the second through hole 323 and the third through hole 412 are aligned with each other for the conductive wire 124 of the nozzle assembly 19 to pass through. The second housing 4 further includes a plurality of second assembly holes 418 aligned with the first assembly holes 318.

Referring to fig. 26, 45-48, the third housing 5 is located below the second housing 4 and connected to the second housing 4. The third housing 5 includes a body portion 51, a boss portion 52 extending downward from the body portion 51, and a flange 53 extending outward from the body portion 51, wherein the flange 53 is provided with a plurality of third assembly holes 531 aligned with the second assembly holes 418 for passing bolts 66 therethrough. The body portion 51 is provided with a third upper surface 511, and the third upper surface 511 is provided with a third annular groove 512 and a third island portion 513 surrounded by the third annular groove 512. The third annular groove 512 is configured to receive a third seal 732 (as shown in fig. 64). The third island 513 is provided with a third positioning hole 5111 penetrating the third upper surface 511 and a fourth positioning hole 5112 penetrating the third upper surface 511. The third housing 5 is provided with a third boss 78 accommodated in the third positioning hole 5111 and a fourth boss 79 accommodated in the fourth positioning hole 5112. The lower end of the first gear shaft 741 is positioned in the third shaft sleeve 78 and the lower end of the second gear shaft 751 is positioned in the fourth shaft sleeve 79.

In addition, the third island 513 is further provided with a second guiding groove 5114 and a third guiding groove 5115 located on the third upper surface 511, wherein the second guiding groove 5114 is communicated with the third positioning hole 5111, and the third guiding groove 5115 is communicated with the fourth positioning hole 5112. Referring to fig. 43, the second diversion trench 5114 and the third diversion trench 5115 are disposed in an inclined manner inside the third casing 5. Referring to fig. 48, the lower end of the liquid outlet chamber 432 is communicated with the second flow guiding groove 5114 and the third flow guiding groove 5115.

In operation, urea solution enters the liquid inlet channel 332 from the urea connecting pipe 333, a part of urea solution enters the metal cover 62 from the first connecting hole 3123, and another part of urea solution enters the liquid inlet cavity 431 from the second connecting hole 3127; the urea solution in the metal cap 62 on the one hand penetrates directly into the first positioning hole 3121 to lubricate the first sleeve 76 and on the other hand penetrates along the first guide groove 3124 into the second positioning hole 3122 to lubricate the second sleeve 77. The urea solution entering the liquid inlet cavity 431 is divided into two paths, wherein one path enters the outlet channel 16 after being pressurized by the gear pump, and the other path enters the third positioning holes 5111 and 5112 from the second and third guide grooves 5114 and 5115 to lubricate the third and fourth shaft sleeves 78 and 79, so that the rotation stability of the gear pump is improved, and the abrasion is reduced. The high pressure urea solution entering the outlet channel 16 enters the receiving chamber 322 along the outlet aperture 3126 to flow towards the nozzle assembly 19, while a portion of the urea solution flows towards the overflow element 173. When the pressure is less than the setting of the overflow element 173, the overflow element 173 is closed and only communicates through the trickle hole 1731; when the pressure is greater than the set value of the overflow element 173, the overflow element 173 is opened, and part of the urea solution enters the liquid inlet channel 332 to realize pressure relief.

It will be appreciated that in the illustrated embodiment of the invention, inlet passage 15 includes inlet passage 332, second connection aperture 3127, and inlet chamber 431. Because the inlet channel 15 is located upstream of the urea pump 11, it is called the low pressure channel. The outlet channel 16 comprises a liquid outlet chamber 432, an outlet aperture 3126, a receiving chamber 322, etc. Since the outlet channel 16 is located downstream of the urea pump 11, it is called the high pressure channel.

Referring to fig. 49-58, the nozzle assembly 19 includes a nozzle assembly housing 190 and a urea nozzle 12 mated with the nozzle assembly housing 190.

The nozzle assembly housing 190 includes a main body portion 91, an extension 92 extending downwardly from the main body portion 91, and a mounting flange 93 extending outwardly from the main body portion 91. The mounting flange 93 is provided with mounting holes 931 for mounting the integrated device 1 to the exhaust pipe 106 or the encapsulation system 300. The main body 91 is provided with a fourth upper surface 911 and a fourth side surface 912. The fourth upper surface 911 is provided with a receiving cavity 94 for receiving the urea nozzle 12 and a recess 95 for receiving the boss 52. Referring to fig. 55, the receiving cavity 94 extends downwardly into the extension 92. The body 91 is further provided with a cylindrical portion 917 projecting upwards into the housing chamber 94 to support the urea nozzle 12.

The nozzle assembly housing 190 is also provided with the cooling assembly for cooling the urea nozzle 12. In the illustrated embodiment of the invention, the cooling assembly is a water-cooled assembly. The cooling passage 141 in the nozzle assembly housing 190 includes a first cooling passage 913 extending through the fourth side 912 and a second cooling passage 914 spaced from the first cooling passage 913. Wherein the first cooling channel 913 communicates with the inlet joint 103 and the second cooling channel 914 communicates with the outlet joint 104. The nozzle assembly housing 190 is provided with an end cap 96 sealed around the periphery of the extension 92. In the illustrated embodiment of the invention, the end cap 96 is welded to the extension 92. So configured, the nozzle assembly housing 190 forms an annular cooling channel 916 between the end cap 96 and the extension 92 that communicates the first cooling channel 914 with the second cooling channel 915.

In the illustrated embodiment of the invention, the mounting flange 93 is integrally machined with the body portion 91. Of course, in other embodiments, the mounting flange 93 may be manufactured separately from the main body 91 and then welded together.

Referring to fig. 50, in the illustrated embodiment of the present invention, the urea nozzle 12 includes a nozzle coil 121, a magnetic portion 81 that interacts with the nozzle coil 121, a valve needle portion 82 located below the magnetic portion 81, a spring 83 that acts between the magnetic portion 81 and the valve needle portion 82, and a valve seat 84 (shown with reference to fig. 5) that cooperates with the valve needle portion 82. The nozzle coil 121 is wound around the outer periphery of the magnetic portion 81. The urea nozzle 12 further comprises a sleeve portion 122 sleeved on the periphery of the nozzle coil 121. The spring 83 is mounted in the magnetic portion 81 and the needle portion 82. The needle portion 82 is provided with a tapered portion 821 and a needle 822 extending downwardly from the tapered portion 821. Referring to fig. 52, the valve seat 84 includes a swirl plate 85 welded to the extension 92. The swirl plate 85 is provided with an injection hole 851 matched with the valve needle 822 and a plurality of swirl grooves 852 communicated with the injection hole 851. Referring to fig. 10, 50 and 59, the upper end of the magnetic portion 81 is sleeved with a fourth sealing ring 812 to seal with the inner wall of the accommodating cavity 322, and the lower end of the magnetic portion 81 is sleeved with a fifth sealing ring 813 to seal with the inner wall of the accommodating cavity 94. As shown in fig. 59, the cylindrical portion 917 supports the needle portion 82, so that the needle portion 82 and the nozzle coil 121 can overlap with each other in the moving direction of the needle 822, and the electromagnetic force generated by the nozzle coil 121 affects the needle portion 82, thereby reducing the driving current, reducing the power consumption of the urea nozzle 12, and reducing the amount of heat generation. In addition, a spacer 86 is provided in the accommodating chamber 94, which cooperates with the urea nozzle 12 to adjust the gap between the magnetic part 81 and the needle part 82. It will be appreciated that the travel of the valve needle portion 82 is closely related to the above-described gap, and that by adjusting the above-described gap with shims 86 of different thicknesses, the travel of the valve needle portion 82 can be precisely controlled to improve the accuracy of the urea nozzle 12.

Referring to fig. 59, the extension 92 is provided with a manifold 921, and the valve needle 822 extends into the manifold 921. The magnetic portion 81 has a first communication hole 811 communicating with the housing chamber 322, the needle portion 82 has a second communication hole 823 communicating with the first communication hole 811, and the tapered portion 821 has a third communication hole 824 communicating the second communication hole 823 with the manifold 921. The swirl slots 852 communicate with the manifold 921. A lower portion of the sleeve portion 122 is accommodated in the accommodating chamber 94, and a portion of the sleeve portion 122 protruding from the fourth upper surface 911 is accommodated in the accommodating chamber 322. The annular cooling channel 916 is located at the periphery of the manifold 921.

It will be appreciated that in other embodiments of the invention, for example, the integrated device is applied to inject fuel into the exhaust of an engine to effect regeneration of a downstream Diesel Particulate Filter (DPF). In this application, the urea pump 11 may be replaced with a fuel pump, the urea nozzle 12 may be replaced with a fuel nozzle, and the urea solution may be replaced with fuel. Such variations will be understood by those skilled in the art and will not be described in detail herein.

For ease of understanding the invention, the urea pump and the fuel pump are collectively referred to as pumps, the urea nozzle and the fuel nozzle are collectively referred to as nozzles, and the urea solution and the fuel are collectively referred to as fluid medium.

Compared with the prior art, the integrated device 1 of the present invention is an integrated design, which can omit or shorten the urea pipe used for connecting the pump and the nozzle in the prior art, can omit the connectors between various sensors and the wire harness in the pump supply unit in the prior art, and can dispense with a heating thawing device, thus having higher reliability. The integrated device 1 of the invention has compact structure and small volume, and is convenient for the installation of various vehicle types. In addition, the internal fluid medium channel in the integrated device 1 is short, the pressure drop is small, the dead volume between the pump and the nozzle is small, and the efficiency is high. The temperature sensor 171 and the pressure sensor 172 are located close to the nozzle, and the injection pressure accuracy is high. In addition, by independently controlling the pump and the nozzle respectively, the action of the nozzle is prevented from being driven by the action of the pump, thereby improving the control accuracy. The injection accuracy of the nozzle is improved, so that the proper ratio of the urea to the nitrogen oxide in the exhaust gas can be achieved, and the crystallization risk caused by excessive urea injection is reduced. The integrated device 1 of the present invention can adopt water cooling, so that the temperature of urea remained in the integrated device 1 can not reach the crystallization point, and crystallization is not easy to generate.

The above embodiments are only for illustrating the present invention and not for limiting the technical solutions described in the present invention, and it should be understood that the present invention should be based on those skilled in the art, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the present invention without departing from the spirit and scope of the present invention and modifications thereof should be covered by the scope of the claims of the present invention.

Claims (28)

1. An integrated pump and nozzle assembly, wherein the pump is configured to pump a fluid medium to the nozzle, the nozzle configured to inject the fluid medium into an exhaust of an engine, characterized by: the integrated device includes a pump assembly and a nozzle assembly; the pump assembly comprising a pump assembly housing and the pump cooperating with the pump assembly housing, the pump assembly housing comprising an inlet passage upstream of and in communication with the pump and an outlet passage downstream of and in communication with the pump, the outlet passage in communication with the nozzle assembly, the pump assembly housing comprising a housing and a first housing below the housing, the housing being provided with a housing cavity, the inlet passage being located within the first housing; the pump assembly includes a motor coil to drive the pump, a magnetic body to interact with the motor coil, and first and second intermeshing gear assemblies, wherein the motor coil is interference fit within the housing cavity, the first gear assembly includes a first gear shaft and a first gear, the second gear assembly includes a second gear shaft and a second gear, the first gear intermeshes with the second gear; the nozzle assembly comprises a nozzle assembly shell and the nozzle matched with the nozzle assembly shell, and further comprises a nozzle coil used for driving the nozzle, wherein the motor coil and the nozzle coil are respectively and independently controlled;

The pump is a urea pump, the nozzle is a urea nozzle, and the fluid medium is urea solution;

the pump assembly shell is provided with a gear groove for accommodating the first gear and the second gear, the first gear is externally meshed with the second gear, one side of the gear groove is provided with a liquid inlet cavity communicated with the inlet channel, and the other side of the gear groove is provided with a liquid outlet cavity communicated with the outlet channel;

the pump assembly shell is provided with a connecting plate assembly matched with the first shell, the connecting plate assembly comprises a plate part and a metal cover which is fixed on the plate part and protrudes upwards, the magnetic body is contained in the metal cover, the motor coil is sleeved on the periphery of the metal cover, and the plate part is fixed on the first shell through a plurality of screws;

the first shell comprises a first upper surface, a first lower surface and a first side surface, wherein the first upper surface is provided with a first annular groove, a first island part surrounded by the first annular groove and a first sealing ring accommodated in the first annular groove, the first sealing ring is positioned below the metal cover, and the sheet part is pressed against the first sealing ring downwards; the first island part is provided with a first positioning hole penetrating through the first upper surface and the first lower surface and a second positioning hole penetrating through the first lower surface, the urea pump comprises a first shaft sleeve and a second shaft sleeve, the first shaft sleeve is accommodated in the first positioning hole, the second shaft sleeve is accommodated in the second positioning hole, the first gear shaft is inserted into the first shaft sleeve, and the second gear shaft is inserted into the second shaft sleeve;

The first lower surface is provided with a first load discharging groove communicated with the first positioning hole and the second positioning hole.

2. The integrated device of claim 1, wherein: the integrated device comprises a controller connected with the motor coil and the nozzle coil, and the controller is used for independently controlling the urea pump and the urea nozzle respectively.

3. The integrated device of claim 1, wherein: the integrated device includes a pressure sensor in communication with the outlet passage and an overflow element connected between the outlet passage and the inlet passage.

4. The integrated device of claim 1, wherein: the integrated device includes a temperature sensor mounted within the pump assembly housing.

5. The integrated device of claim 1, wherein: the pump assembly comprises a metal cover for accommodating the magnetic body, and the motor coil is sleeved on the periphery of the metal cover; the first gear shaft is a driving shaft, the second gear shaft is a driven shaft, and the first gear shaft is higher than the second gear shaft.

6. The integrated device of claim 5, wherein: the pump assembly further includes an elastomer received within the metal cap and positioned below the magnetic body, the elastomer being compressible to absorb an expansion volume resulting from urea icing.

7. The integrated device of claim 1, wherein: the nozzle assembly includes a magnetic portion that interacts with the nozzle coil, a valve needle portion below the magnetic portion, a spring that acts between the magnetic portion and the valve needle portion, and a valve seat that mates with the valve needle portion.

8. The integrated device of claim 7, wherein: the nozzle coil is located on the periphery of the magnetic part, the valve needle part is provided with a valve needle, and the valve seat is provided with an injection hole matched with the valve needle.

9. The integrated device of claim 8, wherein: the valve seat comprises a swirl plate welded on the nozzle assembly shell, the injection hole is arranged on the swirl plate, and the swirl plate is further provided with a plurality of swirl grooves communicated with the injection hole.

10. The integrated device of claim 1, wherein: the integrated device is provided with a cooling component for cooling the urea nozzle, and the cooling component cools the urea nozzle through a cooling medium.

11. The integrated device of claim 2, wherein: the controller is provided with a control board, the motor coil and the nozzle coil are electrically connected with the control board, and the housing is provided with a through hole communicated with the housing cavity and a waterproof and breathable cover fixed in the through hole; the control panel is welded with a flat cable plug which is exposed out of the housing.

12. The integrated device of claim 11, wherein: the housing is connected with the first housing through a bolt, and the pump assembly housing is provided with a support column through which the bolt passes and which is used for supporting the control board.

13. The integrated device of claim 1, wherein: the first island part further comprises a first diversion trench penetrating through the first upper surface and communicated with the second positioning hole and a first connecting hole penetrating through the first upper surface and communicated with the inlet channel; the first shell is provided with a second connecting hole penetrating through the first lower surface and communicated with the liquid inlet cavity, and an outlet hole penetrating through the first lower surface and communicated with the liquid outlet cavity.

14. The integrated device of claim 1, wherein: the first housing is further provided with a containing cavity penetrating downwards through the first lower surface, and the containing cavity is used for containing at least part of the nozzle assembly.

15. The integrated device of claim 14, wherein: the first upper surface is also provided with a pressure sensor accommodating hole which is positioned beside the first island part and used for accommodating a pressure sensor, and the accommodating cavity is communicated with the pressure sensor accommodating hole.

16. The integrated device of claim 13, wherein: the first shell is provided with an overflow element accommodating groove communicated with the outlet hole, and the integrated device is provided with an overflow element arranged in the overflow element accommodating groove; when the pressure of the outlet channel is higher than the set value, the overflow element opens to return part of the urea solution into the inlet channel.

17. The integrated apparatus of claim 16, wherein: the pump assembly housing comprises a second housing located below the first housing and connected with the first housing, the second housing comprises a second upper surface and a second lower surface, and the gear groove penetrates through the second upper surface and the second lower surface.

18. The integrated apparatus of claim 17, wherein: the pump assembly housing comprises a third housing which is positioned below the second housing and is connected with the second housing, the third housing comprises a body part and a protruding part which extends downwards from the body part, wherein the body part is provided with a third upper surface, the third upper surface is provided with a third annular groove and a third island part which is surrounded by the third annular groove, the third island part is provided with a third positioning hole and a fourth positioning hole which penetrate through the third upper surface, and the third positioning hole and the fourth positioning hole extend into the protruding part; the urea pump comprises a third shaft sleeve and a fourth shaft sleeve, wherein the third shaft sleeve is accommodated in the third positioning hole, the fourth shaft sleeve is accommodated in the fourth positioning hole, the first gear shaft is inserted into the third shaft sleeve, and the second gear shaft is inserted into the fourth shaft sleeve.

19. The integrated apparatus of claim 18, wherein: the third island part is provided with a second diversion trench and a third diversion trench penetrating through the third upper surface, wherein the second diversion trench is communicated with the third positioning hole, and the third diversion trench is communicated with the fourth positioning hole.

20. The integrated apparatus of claim 18, wherein: the nozzle assembly shell comprises a main body part and an extension part extending downwards from the main body part, wherein the main body part is provided with a containing cavity for containing the urea nozzle and a groove for containing the protruding part, and the containing cavity extends downwards into the extension part.

21. The integrated device of claim 1, wherein: the pump assembly housing and the nozzle assembly housing are fixed together from bottom to top by a plurality of fixing bolts.

22. The integrated apparatus of claim 20, wherein: the nozzle assembly comprises a magnetic part interacted with the nozzle coil, a valve needle part connected with the magnetic part and a spring acting on the valve needle part; the extension is provided with a manifold in communication with the receiving cavity.

23. The integrated apparatus of claim 22, wherein: the spring is installed the magnetic part with in the needle portion, needle portion be equipped with toper portion and certainly the needle of toper portion downwardly extending, the needle extends into in the manifold, the magnetic part be equipped with hold the first communication hole of chamber intercommunication, needle portion be equipped with the second communication hole of first communication hole intercommunication, toper portion be equipped with the second communication hole with the third communication hole of manifold intercommunication.

24. The integrated apparatus of claim 23, wherein: the nozzle assembly comprises a valve seat matched with the valve needle, the valve seat comprises a swirl plate welded on the extension part, the swirl plate is provided with an injection hole matched with the valve needle and a plurality of swirl grooves communicated with the injection hole, and the swirl grooves are communicated with the manifold.

25. The integrated apparatus of claim 24, wherein: the nozzle assembly shell is provided with a first cooling channel, a second cooling channel arranged at intervals with the first cooling channel and an end cover sealed at the periphery of the extension part, an annular cooling groove communicated with the first cooling channel and the second cooling channel is formed between the end cover and the extension part, the first cooling channel is connected with an inlet joint for injecting engine cooling liquid, and the second cooling channel is connected with an outlet joint for allowing engine cooling liquid to flow out.

26. An exhaust aftertreatment system comprising an injection system for exhaust aftertreatment and an encapsulation system for exhaust aftertreatment, wherein the injection system comprises an integrated device as claimed in any one of claims 1 to 25, the encapsulation system comprising a carrier downstream of the integrated device.

27. The exhaust aftertreatment system of claim 26, wherein: the carrier includes selective catalytic reduction, and the encapsulation system further includes at least one mixer positioned between the integrated device and the carrier.

28. A control method of an integrated device, characterized by: the integrated device is the integrated device according to any one of claims 1 to 25, the control method comprising:

driving the pump in operation, drawing the fluid medium into the pump through the inlet passage;

delivering the fluid medium to the nozzle through the outlet passage after pressurization by the pump;

energizing the nozzle coil when an injection condition is reached, at least partially opening the nozzle to inject the fluid medium into the exhaust of the engine; wherein:

the motor coil and the nozzle coil are respectively and independently controlled.