CN219236705U - Expansion work recovery device and automobile air conditioning system - Google Patents

Abstract

The utility model relates to the technical field of air conditioning, and provides an expansion work recovery device and an automobile air-conditioning system. The expansion work recovery device includes a shell, and the shell is sequentially constructed with an expansion cavity, a separation cavity and a motor cavity, and a supporting shaft runs through two opposite sides of the shell. end, and is rotatably connected with the housing, the expansion chamber is provided with a refrigerant inlet, the separation chamber is provided with a first refrigerant outlet for discharging liquid refrigerant; the motor chamber is provided with a second refrigerant outlet for discharging gaseous refrigerant The fan blades are arranged on the end of the support shaft, and a plurality of fan blades are arranged on the support shaft in the circumferential direction; the expansion impeller is arranged in the expansion cavity, and the plurality of expansion impellers are arranged on the support shaft in the circumferential direction; It is used for the gas-liquid separation of the refrigerant; the motor is installed in the motor chamber to drive the support shaft to rotate. The high-temperature and high-pressure refrigerant enters the expansion chamber from the refrigerant inlet and scours the expansion impeller, and the expansion impeller recovers the expansion work and drives the support shaft and fan blades to rotate, which is beneficial to save energy consumption.

Description

Expansion work recovery device and automobile air conditioning system

technical field

The utility model relates to the technical field of air conditioning, in particular to an expansion work recovery device and an automobile air conditioning system.

Background technique

Automobile air conditioner is an important component in the automobile system, and its performance directly affects the comfort of the human body in the car and the energy consumption of the car. Carbon dioxide, as a natural and environmentally friendly working fluid, is the main direction for the replacement of automotive air-conditioning refrigerants. However, due to its high critical pressure, the system often adopts a transcritical cycle, resulting in a large throttling loss of the system. The throttling element in the existing carbon dioxide air conditioning system does not recycle the throttling loss.

In the prior art, the shaft of the expander is usually connected to the compression part, and the expansion work is recovered for the compression work. However, because the rotation speed of the expansion process and the rotation speed of the compression process are not easy to match, the utilization rate of the expansion work is low. For automobiles Air conditioning systems are more difficult to achieve. In addition, the high-pressure gas is expanded and throttled to produce a gas-liquid mixed two-phase flow, and the gas phase components in it have an adverse effect on the flow heat transfer of the evaporator. Automobiles in the prior art have the problems of failing to effectively recycle throttling losses and high energy consumption.

Utility model content

The utility model provides an expansion work recovery device and an automobile air-conditioning system, which are used to solve the problems of high energy consumption and unutilized refrigerant throttling loss in existing automobiles.

In the first aspect, the utility model provides an expansion work recovery device, including: a housing, a support shaft, a motor, fan blades, an expansion impeller, and a guide assembly;

The housing is sequentially constructed with an expansion chamber, a separation chamber, and a motor chamber. The support shaft runs through opposite ends of the housing and is rotatably connected to the housing. The expansion chamber is provided with a refrigerant inlet, so The separation chamber is provided with a first refrigerant outlet for discharging liquid refrigerant; the motor chamber is provided with a second refrigerant outlet for discharging gaseous refrigerant;

The fan blades are arranged at the end of the support shaft, and a plurality of the fan blades are arranged circumferentially on the support shaft; the expansion impellers are arranged in the expansion cavity, and the plurality of expansion impellers are arranged circumferentially. on the support shaft;

The guide assembly is arranged in the separation chamber for the gas-liquid separation of the refrigerant;

The motor is arranged in the motor cavity and is used to drive the support shaft to rotate.

According to an expansion work recovery device provided by the utility model, the deflector assembly includes a deflector;

A plurality of the deflectors are disposed on the support shaft at intervals along the axial direction of the support shaft, and the deflectors are spirally disposed on the support shaft.

According to an expansion work recovery device provided by the utility model, the support shaft is provided with a spiral groove, and a plurality of the spiral grooves are arranged at intervals along the axial direction of the support shaft, and the guide plate and the The spiral grooves are arranged alternately.

According to an expansion work recovery device provided by the utility model, the flow guide assembly further includes a flow baffle;

The baffle is arranged between the motor and one of the baffles at the end; the baffle includes a plurality of baffles, and the plurality of baffles are arranged circumferentially on the support shaft There is a first gap between one end surface of the baffle and the surface of the support shaft, and a second gap between the other end surface of the baffle and the wall of the separation chamber.

According to the expansion work recovery device provided by the utility model, the separation chamber is gradually expanding, the small end of the separation chamber communicates with the expansion chamber, and the large end of the separation chamber communicates with the motor chamber.

According to an expansion work recovery device provided by the utility model, the first refrigerant outlet is arranged at the end of the separation chamber away from the expansion chamber, and is located at the bottom of the separation chamber;

The second refrigerant outlet is located at the end of the motor chamber away from the separation chamber and is located at the top of the motor chamber.

In the second aspect, the utility model provides an automobile air-conditioning system, including the above-mentioned expansion work recovery device.

According to an automobile air-conditioning system provided by the utility model, the automobile air-conditioning system includes an exterior heat exchanger, the fan blades are arranged opposite to the exterior heat exchanger, and the first refrigerant outlet is connected to the exterior heat exchanger. The inlet of the external heat exchanger is connected, and the outlet of the second refrigerant is connected with the outlet of the external heat exchanger.

According to an automobile air-conditioning system provided by the utility model, the automobile air-conditioning system includes a heat exchange shell and an interior heat exchanger;

The fan blades and the in-vehicle heat exchanger are both arranged in the heat exchange housing, and the fan blades are arranged opposite to the in-vehicle heat exchanger; the first refrigerant outlet is connected to the in-vehicle heat exchanger. The inlet of the heat exchanger is connected, and the outlet of the second refrigerant is connected with the outlet of the in-vehicle heat exchanger.

According to an automobile air-conditioning system provided by the utility model, the automobile air-conditioning system includes a throttle valve, an evaporator, an air supply compressor and a cooler;

The refrigerant inlet, the first refrigerant outlet, the throttle valve, the evaporator, the supplementary air compressor and the cooler are connected in sequence to form a refrigerant circulation loop;

The second refrigerant outlet communicates with the air supply port of the air supply compressor.

In the expansion work recovery device and the automobile air-conditioning system provided by the utility model, an expansion chamber, a separation chamber and a motor chamber are sequentially constructed in the housing, and the supporting shaft runs through opposite ends of the housing, and the expansion impeller and the fan blade are connected to one end of the supporting shaft. The high-temperature and high-pressure refrigerant enters the expansion chamber from the refrigerant inlet to wash the expansion impeller, and the expansion impeller recovers the expansion work, driving the support shaft and fan blades to rotate, which is beneficial to save energy consumption, and the motor assists the support shaft to rotate, which is beneficial to ensure the use of the expansion work recovery device. reliability.

Description of drawings

In order to more clearly illustrate the technical solutions in the utility model or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are the present invention. For some embodiments of the utility model, those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the structural representation of the expansion work recovery device provided by the utility model;

Fig. 2 is the structural representation of the expansion impeller provided by the utility model;

Fig. 3 is a schematic structural view of the baffle plate provided by the utility model;

Fig. 4 is one of the connection schematic diagrams of the expansion work recovery device provided by the utility model;

Fig. 5 is the second connection schematic diagram of the expansion work recovery device provided by the utility model;

Fig. 6 is the third connection schematic diagram of the expansion work recovery device provided by the utility model;

Reference signs: 1: housing; 11: expansion chamber; 111: refrigerant inlet; 12: separation chamber; 121: first refrigerant outlet; 13: motor cavity; 131: second refrigerant outlet; 2: support shaft ;3: Expansion impeller; 4: Fan blade; 5: Guide assembly; 51: Guide plate; 52: Helical groove; 53: Baffle; 6: Motor; 7: External heat exchanger; Internal heat exchanger; 9: heat exchange shell; 91: fresh air inlet; 92: circulating air inlet; 93: lower air outlet; 94: upper air outlet; 95: dehumidification outlet; 14: throttle valve; 15: Evaporator; 16: gas supply compressor; 17: cooler.

Detailed ways

In order to make the purpose, technical solutions and advantages of the utility model clearer, the technical solutions in the utility model will be clearly and completely described below in conjunction with the accompanying drawings in the utility model. Obviously, the described embodiments are the embodiment of the utility model. Some of the embodiments are novel, but not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

The expansion work recovery device of the embodiment of the present invention will be described below with reference to FIG. 1 to FIG. 3 .

As shown in Figure 1, the expansion work recovery device provided by the embodiment of the utility model includes: a housing 1, a support shaft 2, a motor 6, a fan blade 4, an expansion impeller 3 and a guide assembly 5; There are an expansion chamber 11, a separation chamber 12 and a motor chamber 13. The support shaft 2 runs through opposite ends of the housing 1 and is connected to the housing 1 in rotation. The expansion chamber 11 is provided with a refrigerant inlet 111, and the separation chamber 12 is provided with a first The refrigerant outlet 121 is used to discharge liquid refrigerant; the motor chamber 13 is provided with a second refrigerant outlet 131 for discharging gaseous refrigerant; the fan blades 4 are arranged at the end of the support shaft 2, and a plurality of fan blades 4 are arranged in a circular direction Set on the support shaft 2; the expansion impeller 3 is set in the expansion chamber 11, and multiple expansion impellers 3 are set on the support shaft 2 in the circumferential direction; the guide assembly 5 is set in the separation chamber 12 for gas-liquid separation of the refrigerant; the motor 6 It is arranged in the motor cavity 13 and is used to drive the support shaft 2 to rotate.

Specifically, the shell 1 is composed of three interconnected sections, and the three sections are defined as the first section, the second section and the third section respectively, the first section is a cylindrical shell, and the inside is formed The expansion chamber 11; the second section is a cone-shaped shell, and a separation chamber 12 is formed inside; the third section is a cylindrical shell or a square shell, etc., and a motor cavity 13 is formed inside.

As shown in FIG. 1 and FIG. 2 , the support shaft 2 is arranged coaxially with the central axis of the housing 1 , and the support shaft 2 runs through the bottom surface of the motor cavity 13 and the top surface of the expansion cavity 11 . Both the expansion impeller 3 and the fan blade 4 are installed on the same end of the support shaft 2, the number of the expansion impeller 3 is set according to actual needs, the support shaft 2 is coaxially provided with a first support body, and a plurality of expansion impellers 3 surround the support shaft 2 The axis is evenly distributed on the first supporting body in a circumferential direction, and a plurality of expansion impellers 3 are all located in the expansion cavity 11 . The number of fan blades 4 is set according to actual needs, the fan blades 4 are arranged close to the expansion impeller 3, the support shaft 2 is coaxially provided with a second support body, and a plurality of fan blades 4 are arranged on the second support around the axis of the support shaft 2 body, and a plurality of fan blades 4 are located outside the expansion cavity 11 . Both the expansion impeller 3 and the fan blade 4 are connected to the support shaft 2, and the expansion impeller 3 and the fan blade 4 can rotate synchronously.

The flow guide assembly 5 is arranged in the separation chamber 12, the flow guide assembly 5 can be installed on the support shaft 2, the flow guide assembly 5 extends from one end of the separation chamber 12 to the other end of the separation chamber 12, and enters the separation chamber 12 from the expansion chamber 11 The gas-liquid two-phase refrigerant inside produces a rotational motion under the action of the guide assembly 5, the liquid phase with a higher density is thrown to the surface of the swirling flow to form a liquid film, and the gas phase with a lower density gathers in the central area to form a gas core, thereby Realize the separation of liquid refrigerant and gaseous refrigerant.

A refrigerant inlet 111 is provided on the wall of the expansion chamber 11, and the refrigerant inlet 111 is used to introduce high-temperature and high-pressure refrigerant, and the refrigerant may be carbon dioxide refrigerant. The separation chamber 12 has opposite first ends and second ends, defining the end of the separation chamber 12 close to the expansion chamber 11 as the first end of the separation chamber 12, and the end of the separation chamber 12 away from the expansion chamber 11 as the second end of the separation chamber 12 , the second end of the separation chamber 12 is provided with a first refrigerant outlet 121 for discharging liquid refrigerant. The motor 6 is installed in the motor cavity 13, the motor 6 can be arranged coaxially with the support shaft 2, and the motor 6 can drive the support shaft 2 to rotate. The motor cavity 13 is provided with a second refrigerant outlet 131 for discharging gaseous refrigerant.

The high-temperature and high-pressure refrigerant enters the expansion chamber 11 from the refrigerant inlet 111 and impacts the expansion impeller 3. The potential energy and kinetic energy of the refrigerant are converted into the kinetic energy of the expansion impeller 3, so that the expansion impeller 3 drives the support shaft 2 to rotate, and the fan blades 4 and the expansion impeller 3 rotate. The impellers 3 are all connected to the support shaft 2, thereby driving the fan blades 4 to rotate. The expansion impeller 3 recovers the expansion work of the refrigerant, the expansion impeller 3 drives the support shaft 2 to rotate, and the support shaft 2 drives the coaxially arranged fan blade 4 to rotate, thereby reducing the power consumption of the fan blade 4 .

The high-temperature and high-pressure refrigerant is expanded and throttled by the expansion impeller 3 and then transformed into a gas-liquid two-phase refrigerant and then enters the separation chamber 12. The first refrigerant outlet 121 is discharged, and the gaseous refrigerant is discharged through the second refrigerant outlet 131 . The first refrigerant outlet 121 is connected to the heat exchanger, and the second refrigerant outlet 131 is connected to the heat exchanger or the supplementary air compressor according to usage requirements, so as to realize the circulation of the refrigerant.

The motor 6 is installed in the motor chamber 13. When the air volume of the fan blade 4 is reduced due to insufficient expansion work, the motor 6 can drive the support shaft 2 to rotate, so that the fan blade 4 runs at the target speed to meet the heat exchange demand and ensure the recovery of the expansion work stable operation of the device. The motor 6 is installed in the motor cavity 13, and the gaseous refrigerant after the gas-liquid separation enters the motor cavity 13. Since the temperature of the refrigerant that is throttled to the medium pressure decreases, the gaseous refrigerant flows through the motor cavity 13, which can damage the motor 6. Cooling is beneficial to prolong the service life of the motor 6 .

In the embodiment of the present utility model, an expansion chamber 11, a separation chamber 12 and a motor chamber 13 are sequentially constructed in the casing 1, the support shaft 2 runs through opposite ends of the casing 1, and the expansion impeller 3 and the fan blade 4 are connected to the support shaft At one end of 2, the high-temperature and high-pressure refrigerant enters the expansion chamber 11 from the refrigerant inlet 111 to wash the expansion impeller 3, and the expansion impeller 3 recovers the expansion work, driving the support shaft 2 and the fan blade 4 to rotate, which is beneficial to save energy consumption, and the motor 6 assists the support shaft 2 Rotation is conducive to ensuring the reliability of the expansion work recovery device.

As shown in FIG. 1 , in an optional embodiment, the deflector assembly 5 includes a deflector 51; a plurality of deflectors 51 are arranged on the support shaft 2 at intervals along the axial direction of the support shaft 2, and the deflector 51 is Helically provided on the support shaft 2 .

Specifically, the deflector assembly 5 includes a deflector 51, the number of the deflectors 51 is set according to actual needs, and a plurality of deflectors 51 are arranged at intervals between the first end and the second end of the separation chamber 12, the deflectors 51 is arranged on the supporting shaft 2 in a spiral shape. The deflector 51 can be connected with the support shaft 2 by welding or screwing.

The refrigerant entering the expansion chamber 11 is expanded and throttled by the expansion impeller 3 and then enters the separation chamber 12. The multiple deflectors 51 rotate synchronously with the support shaft 2. Due to the difference in density of the gas-liquid two phases, the centrifugal force in the rotating field Differently, the gas-liquid two-phase refrigerant rotates along the plurality of deflectors 51, and the liquid phase with higher density is thrown to the swirl surface, and gathers at the wall surface of the second end of the separation chamber 12, and further can be separated by the separation chamber. The first refrigerant outlet 121 provided at the second end of 12 is discharged. The gaseous phase with less density gathers in the vicinity of the support shaft 2 to form a gas core, and the gaseous refrigerant further flows into the motor cavity 13 and is discharged from the second refrigerant outlet 131 .

In the embodiment of the present utility model, a plurality of deflectors 51 are spirally arranged on the support shaft 2 at intervals, the expansion work recovered by the expansion impeller 3 drives the support shaft 2 to rotate, and the plurality of deflectors 51 rotate with the support shaft 2, The gas-liquid two-phase refrigerant rotates along the plurality of deflector plates 51, and the recovered expansion work is used to separate the liquid refrigerant from the gas refrigerant, which is beneficial to energy saving.

As shown in Figure 1, in an optional embodiment, the support shaft 2 is provided with a helical groove 52, a plurality of helical grooves 52 are arranged at intervals along the axial direction of the support shaft 2, and the guide plate 51 and the helical groove 52 staggered settings.

Specifically, a section of the support shaft 2 located in the separation chamber 12 is provided with a plurality of helical grooves 52, and the plurality of helical grooves 52 are arranged at intervals on the support shaft 2, and the plurality of helical grooves 52 form a helical track. The track extends from the first end of the separation chamber 12 to the second end of the separation chamber 12 .

The spiral groove 52 can enhance the surface roughness of the centrifugal separation section of the support shaft 2, making the flow of the fluid more stable. The deflectors 51 and the spiral grooves 52 are arranged alternately, and the gas-liquid two-phase refrigerant flows through a plurality of alternately arranged The deflector 51 and the plurality of spiral grooves 52 can effectively prevent the two-phase fluid from oscillating, which is conducive to improving the separation efficiency and separation effect.

As shown in Fig. 1 and Fig. 3, in an optional embodiment, the flow guide assembly 5 also includes a flow baffle; the flow baffle is arranged between the motor 6 and a flow guide 51 at the end; the flow baffle includes A plurality of baffles 53, the plurality of baffles 53 are arranged circumferentially in the circumferential direction of the support shaft 2; there is a first gap between one end surface of the baffle 53 and the surface of the support shaft 2, the other of the baffle 53 There is a second gap between one end surface and the cavity wall surface of the separation cavity 12 .

Specifically, the baffle is arranged at the second end of the separation chamber 12 , and the baffle is located between the motor 6 and a deflector 51 at the end of the support shaft 2 near the second end of the separation chamber 12 . The baffle includes a plurality of baffles 53. The number of baffles 53 is set according to requirements. The baffles 53 are vertically arranged on the support shaft 2. The shape of the baffles 53 can be strip-shaped or fan-shaped. The baffle 53 can be connected with the support shaft 2 by welding or screwing.

For example, the baffle 53 is in the shape of a fan, and the two baffles 53 are arranged symmetrically. Along the radial direction of the support shaft 2, the baffle 53 has a first end surface and a second end surface opposite to each other, and the first end surface is close to the support shaft 2. The second end face is close to the cavity wall surface of the separation chamber 12, the arc length of the first end face is less than the arc length of the second end face, there is a first gap between the first end face and the surface of the support shaft 2, the second end face and the cavity of the separation chamber 12 There is a second gap between the walls. The liquid refrigerant after gas-liquid separation can flow from the first gap to the motor cavity 13 , and the second gap is enough for the baffle plate 53 to rotate with the support shaft 2 without colliding with the wall of the separation cavity 12 .

The baffle 53 can be connected to the support shaft 2 through a connecting rod. For example, one end of the connecting rod is connected to the first end surface of the baffle 53 by welding, and the other end of the connecting rod is connected to the surface of the support shaft 2 by welding to realize The connection of the baffle plate 53 to the support shaft 2 . It is also possible that one end of the connecting rod is provided with an external thread, and the first end surface of the baffle 53 is provided with an internal thread, and the connecting rod and the baffle 53 are screwed. Also can support shaft 2 be provided with axle hole, the aperture of axle hole and the diameter of connecting rod match, and the other end of connecting rod is also provided with external thread, after one end of connecting rod is screwed with baffle plate 53, connecting rod The shaft hole is pierced, and a nut is screwed on the external thread of the other end of the connecting rod to realize the screw connection between the baffle plate 53 and the support shaft 2, which is conducive to the convenience of installation and disassembly.

The baffle 53 is located between the motor 6 and the last baffle 51 at the second end of the separation chamber 12 . After the two-phase fluid flows through a plurality of deflectors 51 and a plurality of spiral grooves 52, the outer surface of the two-phase fluid may entrain a small amount of liquid droplets, and the droplets hit the deflectors 53 under the action of inertia, and under the action of gravity The bottom flows along the surface of the baffle plate 53 to the first refrigerant outlet 121 provided at the second end of the separation chamber 12, and the baffle plate 53 is beneficial to further improve the gas-liquid separation efficiency and gas-liquid separation effect.

As shown in FIG. 1 , in an optional embodiment, the separation chamber 12 is in a gradually expanding shape, the small end of the separation chamber 12 communicates with the expansion chamber 11 , and the large end of the separation chamber 12 communicates with the motor chamber 13 .

Specifically, the separation chamber 12 is gradually expanding, the small end of the separation chamber 12 is connected to the expansion chamber 11 , and the large end of the separation chamber 12 is connected to the motor chamber 13 . The gradually expanding structure of the separation chamber 12 is beneficial to the expansion and deceleration of the gas-liquid two-phase refrigerant, so that the gas-liquid two-phase refrigerant can be effectively separated into gas refrigerant and liquid refrigerant.

In an optional embodiment, the first refrigerant outlet 121 is arranged at the end of the separation chamber 12 away from the expansion chamber 11 and at the bottom of the separation chamber 12; the second refrigerant outlet 131 is arranged at the end of the motor chamber 13 away from the separation chamber 12 One end, and located at the top of the motor chamber 13.

Specifically, the bottom of the second end of the separation chamber 12 is provided with a first refrigerant outlet 121 , and the baffle plate 53 can be aligned with the first refrigerant outlet 121 . The liquid refrigerant after gas-liquid separation can flow along the wall surface of the separation chamber 12 to the first refrigerant outlet 121, and the liquid refrigerant that hits the surface of the baffle plate 53 can flow to the first refrigerant outlet along its surface under the action of gravity. The first refrigerant outlet 121 facilitates the liquid refrigerant after gas-liquid separation to flow out from the first refrigerant outlet 121 smoothly.

The second refrigerant outlet 131 is disposed at an end of the motor chamber 13 away from the separation chamber 12 , and the second refrigerant outlet 131 is disposed at the top of the motor chamber 13 . The gaseous refrigerant after gas-liquid separation flows into the motor chamber 13 from the first gap between the baffle plate 53 and the support shaft 2, and the gaseous refrigerant flows from the first end of the motor chamber 13 toward the second end of the motor chamber 13 During the process, the running motor 6 can be cooled, which is beneficial to improve the service life of the motor 6 and ensure the reliable operation of the expansion work recovery device.

Further, the refrigerant inlet 111 is arranged opposite to the expansion impeller 3, and the high-temperature and high-pressure refrigerant entering through the refrigerant inlet 111 can directly flush the expansion impeller 3, which is beneficial to reduce the loss of the refrigerant along the way.

Further, the motor 6 is arranged coaxially with the support shaft 2, which is beneficial to reduce the size of the motor chamber 13, and the motor 6, the expansion impeller 3 and the fan blade 4 are all integrated on the support shaft 2, which is beneficial to the compactness of the overall structure and has It is beneficial to reduce the loss of refrigerant along the process and improve energy utilization.

The embodiment of the utility model also provides an automobile air-conditioning system, including the above-mentioned expansion work recovery device. The expansion work recovery device is installed on the refrigerant circulation circuit of the air conditioning system. The refrigerant is carbon dioxide refrigerant. The expansion work recovery device has a refrigerant inlet 111 , a first refrigerant outlet 121 and a second refrigerant outlet 131 .

The refrigerant inlet 111 is used to feed high-temperature and high-pressure refrigerant, the first refrigerant outlet 121 is used to discharge liquid refrigerant, and the first refrigerant outlet 121 is connected to the heat exchanger; the second refrigerant outlet 131 is used to discharge gaseous refrigerant , the second refrigerant outlet 131 is connected with a heat exchanger or a make-up air compressor.

The expansion work recovered by the expansion work recovery device drives the fan blade 4 to rotate, which is beneficial to saving power consumption. When the expansion work is insufficient, the motor 6 drives the support shaft 2 to rotate, which is beneficial to ensure the stable operation of the air conditioning system, and the gas-phase refrigerant after gas-liquid separation flows through the motor chamber 13 to cool the motor 6, which is beneficial to prolong the service life of the motor 6 . The motor 6, the expansion impeller 3 and the fan blade 4 are integrated on the support shaft 2, and the overall structure is compact, which reduces the loss of the carbon dioxide refrigerant along the process and is conducive to improving energy utilization.

In the embodiment of the utility model, the air-conditioning system including the expansion work recovery device can effectively save the power consumption of the fan blade 4, recover and utilize the throttling loss of the carbon dioxide refrigerant, and reduce the loss of the carbon dioxide refrigerant along the way. It is beneficial to increase the cruising range of the car.

As shown in Figure 4, in an optional embodiment, the automotive air conditioning system includes an external heat exchanger 7, the fan blades 4 are arranged opposite to the external heat exchanger 7, and the first refrigerant outlet 121 exchanges heat with the external The inlet of the heat exchanger 7 is connected, and the second refrigerant outlet 131 is connected with the outlet of the external heat exchanger 7 .

Specifically, it is described that the expansion work recovery device is used in conjunction with the external heat exchanger 7. The first refrigerant outlet 121 is connected to the inlet of the external heat exchanger 7, and the second refrigerant outlet 131 is connected to the external heat exchanger 7. The outlet of the refrigerant or the second refrigerant outlet 131 is connected to the air supply port of the air supply compressor. The fan blades 4 are spaced apart from the external heat exchanger 7 and are set oppositely. The support shaft 2 in the separation chamber 12 is provided with a plurality of staggered baffles 51 and spiral grooves 52, and a baffle is provided between the motor 6 and the baffle 51 at the end of the second end of the separation chamber 12 53.

In winter heating conditions, the external heat exchanger 7 is equivalent to an evaporator, and the carbon dioxide refrigerant flows into the housing 1 along the refrigerant inlet 111 in the form of high-temperature and high-pressure gas, washes the expansion impeller 3, and is throttled in the expansion chamber 11. The expansion impeller 3 recovers the expansion work, drives the support shaft 2 and the fan blade 4 to rotate, and the fan blade 4 convects heat with the external heat exchanger 7 . When the expansion work is insufficient, the motor 6 can drive the fan blade 4 to rotate to keep it at the target speed, so as to ensure the stability of the fan blade 4 rotation.

The refrigerant enters the separation chamber 12 after being expanded and throttled by the expansion impeller 3, and the two-phase fluid flows through the deflector 51, the spiral groove 52 and the baffle 53 in sequence to realize gas-liquid separation, and the liquid refrigerant flows along the wall under the action of gravity. It flows to the first refrigerant outlet 121, and the first refrigerant outlet 121 is connected to the inlet of the external heat exchanger 7, and the liquid refrigerant enters the external heat exchanger 7 to evaporate and absorb heat. The gaseous refrigerant cools the motor 6 while flowing through the motor cavity 13 , and further flows to the second refrigerant outlet 131 .

When the air conditioning system is a conventional system, the second refrigerant outlet 131 is connected to the outlet of the external heat exchanger 7 . After the liquid refrigerant enters the external heat exchanger 7 to evaporate and absorb heat, it passes into the next component together with the gaseous refrigerant discharged from the second refrigerant outlet 131 , which saves the heat exchange area of the external heat exchanger 7 .

When the air conditioning system is an air supply system, the second refrigerant outlet 131 is connected to the air supply port of the air supply compressor, and the gaseous refrigerant discharged from the second refrigerant outlet 131 flows into the air supply compressor to play the role of air supply, which is beneficial to the air supply. Simplification of air structure.

As shown in Figure 5, in an optional embodiment, the automotive air conditioning system includes a heat exchange housing 9 and an in-vehicle heat exchanger 8; the fan blades 4 and the in-vehicle heat exchanger 8 are all located in the heat exchange housing 9 , the fan blades 4 are arranged opposite to the interior heat exchanger 8 at intervals; the first refrigerant outlet 121 is connected to the inlet of the interior heat exchanger 8 , and the second refrigerant outlet 131 is connected to the outlet of the interior heat exchanger 8 .

Specifically, it will be explained that the expansion work recovery device is used together with the in-vehicle heat exchanger 8. The air-conditioning system also includes a heat exchange shell 9 and an in-vehicle heat exchanger 8. Inside the thermal housing 9, the fan blades 4 and the interior heat exchanger 8 are arranged facing each other at intervals. The first refrigerant outlet 121 is connected to the inlet of the in-vehicle heat exchanger 8 , the second refrigerant outlet 131 is connected to the outlet of the in-vehicle heat exchanger 8 or the second refrigerant outlet 131 is connected to the air supply port of the air supply compressor.

The heat exchange shell 91 is provided with a fresh air inlet 91, a circulating air inlet 92, a lower air outlet 93 and a dehumidification outlet 95, and the fresh air inlet 91, the circulating air inlet 92, the lower air outlet 93 and the dehumidification outlet 95 are all inclined. The heat exchange housing 9 is also provided with an upper air outlet 94 which is arranged horizontally to facilitate the export of warm air.

In summer cooling conditions, high-temperature and high-pressure carbon dioxide refrigerant flows into the housing 1 from the refrigerant inlet 111, washes the expansion impeller 3, and throttles in the expansion chamber 11, and the expansion impeller 3 recovers the expansion work, driving the support shaft 2 and the fan The blades 4 rotate, and the fan blades 4 exchange heat with the heat exchanger 8 in the vehicle. When the expansion work is insufficient, the motor 6 can drive the fan blade 4 to rotate to keep it at the target speed, so as to ensure the stability of the system. The fan blades 4 rotate, and the fresh air and circulating air flow through the heat exchange housing 9 and are discharged from the upper air outlet 94, the lower air outlet 93, and the dehumidification outlet 95, and blow air to the upper side, lower side, and window of the passenger compartment to achieve cooling or dehumidification Purpose.

The refrigerant enters the separation chamber 12 after being expanded and throttled by the expansion impeller 3, and the two-phase fluid flows through the deflector 51, the spiral groove 52 and the baffle 53 in sequence to realize gas-liquid separation, and the liquid refrigerant flows along the wall under the action of gravity. It flows to the first refrigerant outlet 121, and the first refrigerant outlet 121 is connected to the inlet of the interior heat exchanger 8, and the liquid refrigerant flows into the interior heat exchanger 8 to evaporate and absorb heat. The gaseous refrigerant cools the motor 6 while flowing through the motor cavity 13 , and further flows to the second refrigerant outlet 131 .

When the air conditioning system is a conventional system, the second refrigerant outlet 131 is connected to the outlet of the in-vehicle heat exchanger 8 . After the liquid refrigerant enters the interior heat exchanger 8 to evaporate and absorb heat, it passes into the next component together with the gaseous refrigerant discharged from the second refrigerant outlet 131 .

When the air conditioning system is an air supply system, the second refrigerant outlet 131 is connected to the air supply port of the air supply compressor, and the gaseous refrigerant discharged from the second refrigerant outlet 131 flows into the air supply compressor to play the role of air supply, which is beneficial to the air supply. Simplification of air structure.

As shown in Figure 6, in an optional embodiment, the automotive air conditioning system includes a throttle valve 14, an evaporator 15, a supplementary air compressor 16 and a cooler 17; a refrigerant inlet, a first refrigerant outlet 121, a throttling The valve 14 , the evaporator 15 , the supplementary air compressor 16 and the cooler 17 are connected in sequence to form a refrigerant circulation loop; the second refrigerant outlet 131 communicates with the supplementary air port of the supplementary air compressor 16 .

Specifically, the expansion work recovery device is used in conjunction with the air supply system, and the air conditioning system includes a throttle valve 14 , an evaporator 15 , an air supply compressor 16 and a cooler 17 . The fan blades 4 are spaced apart from the evaporator 11 and face to face. The air outlet of the supplementary air compressor 16 is connected to the inlet of the cooler 17, and the outlet of the cooler 17 is connected to the refrigerant inlet 111 of the expansion work recovery device. The first refrigerant outlet 121 is connected to the inlet of the throttle valve 14 , the outlet of the throttle valve 14 is connected to the inlet of the evaporator 15 , and the outlet of the evaporator 15 is connected to the suction port of the supplementary air compressor 16 . The second refrigerant outlet 131 is connected to the air supply port of the air supply compressor 16 .

The high-temperature and high-pressure gaseous carbon dioxide refrigerant discharged from the supplementary air compressor 16 flows in from the refrigerant inlet 111 after being released by the cooler 17, washes the expansion impeller 3, and the expansion throttle reaches the intermediate pressure, and the expansion impeller 3 drives the fan blade 4 to rotate to evaporate Device 15 dissipates heat. The gas-liquid two-phase refrigerant after expansion and throttling enters the separation chamber 12, and the two-phase fluid flows through the guide plate 51, the spiral groove 52 and the baffle plate 53 in sequence to realize gas-liquid separation. The liquid refrigerant is thrown out along the radial direction of the deflector 51, and flows to the first refrigerant outlet 121 under the action of gravity. flow to the first refrigerant outlet 121.

The gaseous refrigerant flows through the motor chamber 13 to cool the motor 6, and further flows to the second refrigerant outlet 131, and flows from the second refrigerant outlet 131 into the gas supply port of the supplementary air compressor 16. This part of the gaseous refrigerant is defined as supplementary air. gas refrigerant.

The liquid refrigerant flowing out from the first refrigerant outlet 121 flows into the throttling valve 14 and is throttled twice to the evaporation pressure, then enters the evaporator 15 to absorb heat, is compressed once in the supplementary air compressor 16, and is combined with the supplementary air refrigerant After mixing, a secondary compression is performed. The air supply structure of this air conditioning system replaces the primary throttle valve and the gas-liquid separator, effectively recovers and utilizes the expansion work, saves the power consumption of the fan blade 4, reduces the throttling loss and the loss along the process, and the air conditioning system runs stably. Reliable with low power consumption.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions recorded in the foregoing embodiments, or to perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit of the technical solutions of the various embodiments of the present utility model. and range.

Claims (10)

1. An expansion work recovery device, characterized by comprising: the device comprises a shell, a supporting shaft, a motor, fan blades, an expansion impeller and a flow guiding assembly;

the expansion cavity is provided with a refrigerant inlet, and the separation cavity is provided with a first refrigerant outlet for discharging liquid refrigerant; the motor cavity is provided with a second refrigerant outlet for discharging gaseous refrigerant;

the fan blades are arranged at the end part of the supporting shaft, and the fan blades are annularly arranged on the supporting shaft; the expansion impeller is arranged in the expansion cavity, and a plurality of expansion impellers are circumferentially arranged on the support shaft;

the flow guide assembly is arranged in the separation cavity and used for separating gas from liquid of the refrigerant;

the motor is arranged in the motor cavity and used for driving the supporting shaft to rotate.

2. The expansion work recovery device according to claim 1, wherein the flow guide assembly comprises a flow guide plate;

the guide plates are arranged on the support shaft at intervals along the axial direction of the support shaft, and the guide plates are spirally arranged on the support shaft.

3. The expansion work recovery device according to claim 2, wherein the support shaft is provided with spiral grooves, a plurality of the spiral grooves are arranged at intervals along an axial direction of the support shaft, and the baffle plates are arranged alternately with the spiral grooves.

4. The expansion work recovery device according to claim 2, wherein the flow guide assembly further comprises a flow baffle;

the flow baffle is arranged between the motor and one guide plate at the end part; the flow blocking piece comprises a plurality of flow blocking plates, and the flow blocking plates are circumferentially arranged on the circumference of the supporting shaft; a first gap is formed between one end face of the flow baffle and the surface of the supporting shaft, and a second gap is formed between the other end face of the flow baffle and the cavity wall surface of the separation cavity.

5. The expansion work recovery device according to claim 1, wherein the separation chamber is formed in a gradually expanding shape, a small end of the separation chamber is communicated with the expansion chamber, and a large end of the separation chamber is communicated with the motor chamber.

6. The expansion work recovery device according to claim 1, wherein the first refrigerant outlet is provided at an end of the separation chamber remote from the expansion chamber and at a bottom of the separation chamber;

the second refrigerant outlet is arranged at one end of the motor cavity away from the separation cavity and is positioned at the top of the motor cavity.

7. An automotive air conditioning system comprising the expansion work recovery device according to any one of claims 1 to 6.

8. The vehicle air conditioning system of claim 7, including an external heat exchanger, wherein the fan blade is disposed in spaced opposition to the external heat exchanger, wherein the first refrigerant outlet is connected to an inlet of the external heat exchanger, and wherein the second refrigerant outlet is connected to an outlet of the external heat exchanger.

9. The vehicle air conditioning system of claim 7, wherein the vehicle air conditioning system comprises a heat exchange housing and an in-vehicle heat exchanger;

the fan blades and the in-vehicle heat exchanger are arranged in the heat exchange shell, and the fan blades and the in-vehicle heat exchanger are arranged in a spaced opposite mode; the first refrigerant outlet is connected with the inlet of the in-vehicle heat exchanger, and the second refrigerant outlet is connected with the outlet of the in-vehicle heat exchanger.

10. The vehicle air conditioning system of claim 7, wherein the vehicle air conditioning system comprises a throttle valve, an evaporator, a compressor, and a cooler;

the refrigerant inlet, the first refrigerant outlet, the throttle valve, the evaporator, the air supplementing compressor and the cooler are sequentially communicated to form a refrigerant circulation loop;

the second refrigerant outlet is in communication with a make-up port of the make-up compressor.

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