CN116181448B - A stacking body and centrifugal separator - Google Patents
A stacking body and centrifugal separator Download PDFInfo
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- CN116181448B CN116181448B CN202211328026.XA CN202211328026A CN116181448B CN 116181448 B CN116181448 B CN 116181448B CN 202211328026 A CN202211328026 A CN 202211328026A CN 116181448 B CN116181448 B CN 116181448B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M13/00—Crankcase ventilating or breathing
- F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Centrifugal Separators (AREA)
- Separating Particles In Gases By Inertia (AREA)
Abstract
本发明公开了一种堆叠体及离心式分离器。该堆叠体包括若干依次堆叠的分离盘，每两个相邻的所述分离盘堆叠后分别形成有用于分离气液混合物的分离间隙，所述分离盘的上端开口内设置有第一通孔和多个围绕所述第一通孔的第一流道，每个所述分离盘的第一通孔均对应设置，每个所述分离盘上的第一流道均对应设置，沿所述堆叠体的堆叠方向，从上至下，所述分离盘的第一流道的横截面面积之和具有增大的趋势。该堆叠体使得可充分利用分离盘并促进流量平衡，从而可提高分离效果和分离效率。
The present invention discloses a stacking body and a centrifugal separator. The stacking body comprises a plurality of separation discs stacked in sequence, and each two adjacent separation discs are stacked to form a separation gap for separating a gas-liquid mixture, and a first through hole and a plurality of first flow channels surrounding the first through hole are arranged in the upper opening of the separation disc, and the first through hole of each separation disc is arranged correspondingly, and the first flow channel on each separation disc is arranged correspondingly, and along the stacking direction of the stacking body, from top to bottom, the sum of the cross-sectional areas of the first flow channels of the separation discs has an increasing trend. The stacking body makes full use of the separation discs and promotes flow balance, thereby improving the separation effect and separation efficiency.
Description
Technical Field
The invention relates to the technical field of centrifugal separators, in particular to a stacking body and a centrifugal separator.
Background
Centrifugal separators are a major component of crankcase ventilation systems that provide for efficient separation of engine oil from crankcase blow-by gases, the separation performance of which has a significant impact on engine reliability and emissions.
The working principle of the active centrifugal separator is that the rotation vortex is formed in the separator by the external input energy, and the particles in the mixed airflow are separated out under the action of centrifugal force. The rotary shaft of the active centrifugal separator is provided with a plurality of conical separation discs, the positions of the separation discs close to the rotary shaft are provided with through holes, namely, the mixture flow channels, and when the rotary shaft moves, the mixture is thrown out along the separation gaps among the conical separation discs under the action of centrifugal force, so that the purpose of gas-liquid separation is achieved.
However, in this prior art, when the gas-liquid mixture enters the separation disc from the bottom of the housing, a large amount of the gas-liquid mixture enters the corresponding separation gap through the inner hole in the separation disc near the upper side of the housing under the action of inertia, and a small amount of the gas-liquid mixture enters the corresponding separation gap through the inner hole in the separation disc near the lower side of the housing, so that the flow imbalance between the separation disc near the upper side of the housing and the separation disc near the lower side of the housing is caused, and the separation efficiency is low.
Disclosure of Invention
The invention aims to provide a stack and a centrifugal separator, which can fully utilize a separation disc so as to promote flow balance and improve separation effect and separation efficiency.
The invention adopts the following technical scheme:
The utility model provides a pile up body, includes a plurality of separation discs that stack gradually, every two adjacent be formed with the separation clearance that is used for separating gas-liquid mixture respectively after the separation disc stacks, be provided with first through-hole and a plurality of centers on in the upper end opening of separation disc the first runner of first through-hole, every the first through-hole of separation disc all corresponds the setting, every the first runner on the separation disc all corresponds the setting, follows the pile up direction of pile up body from top to bottom, the cross sectional area of the first runner of separation disc sum has the trend of increase.
Preferably, from top to bottom, the separation discs are divided into groups of separation discs, the sum of the cross-sectional areas of the first flow channels of the individual separation discs in the lower group of separation discs being larger than the sum of the cross-sectional areas of the first flow channels of the individual separation discs in the upper group of separation discs.
Preferably the number of separation discs in each set of separation discs is the same or different, and the cross-sectional area of the first flow channels of the separation discs in each set of separation discs is the same.
Preferably, the sum of the cross-sectional areas of the first flow channels of the separation discs increases gradually from top to bottom.
Preferably, the sum of the cross-sectional areas of the first flow channels of the separation discs at the top of the stack is 1000mm 2, the sum of the cross-sectional areas of the first flow channels of the separation discs at the bottom of the stack is 1600mm 2, and the sum of the cross-sectional areas of the first flow channels increases by 24-30mm 2 in sequence from top to bottom along the stacking direction of the stack.
Preferably, the separation disc is of a hollow truncated cone-shaped structure, and openings which are communicated with each other are formed in the upper end and the lower end of the separation disc.
Preferably, a plurality of drainage ribs are arranged on the inner side wall of the separation disc at equal intervals or unequal intervals, extend from the upper end opening of the separation disc to the lower end opening of the separation disc, and are gradually thickened from top to bottom in thickness.
A centrifugal separator comprising a stack according to any one of the preceding claims.
Preferably, the centrifugal separator comprises a first pressing plate and a second pressing plate, wherein the first pressing plate and the second pressing plate are of hollow truncated cone-shaped structures, the first pressing plate is sleeved on the upper portion of the separation disc arranged at the top of the stacked body and at least covers the first flow channel, a second through hole corresponding to the first through hole is formed in the first pressing plate from top to bottom in a penetrating mode, the second pressing plate is sleeved on the lower portion of the separation disc arranged at the bottom of the stacked body, communicated openings are formed in the upper end and the lower end of the second pressing plate in a penetrating mode, a third through hole and a plurality of second flow channels distributed around the third through hole are arranged in the opening at the upper end of the second pressing plate, and the third through hole corresponds to the position of the first through hole, and the first flow channel corresponds to the position of the second flow channel.
Preferably, the centrifugal separator further comprises a housing and a rotating shaft, the housing comprises an air inlet, an air outlet and a liquid outlet, the air outlet is close to the upper end of the housing, the air inlet and the liquid outlet are close to the lower end of the housing, the separating discs are stacked on the rotating shaft, the rotating shaft is used for driving the first pressing plate, the second pressing plate and the plurality of separating discs to rotate so that gas-liquid mixture entering from the air inlet is separated into gas and liquid under the centrifugal separation effect of the separating discs, the separated gas is discharged outwards through the air outlet, the separated liquid is discharged outwards through the liquid outlet, throttling ribs of the separating discs close to the upper end of the housing are arranged on the outer side wall of the separating discs, and throttling effect of the throttling ribs of the separating discs close to the lower end of the housing on the gas-liquid mixture is larger than throttling effect of the throttling ribs of the separating discs close to the lower end of the housing on the gas-liquid mixture.
Compared with the prior art, the invention has the beneficial effects that at least:
the sum of the cross-sectional areas of the first flow passages of the separation discs from top to bottom in the stacking direction of the stacked body has a tendency to increase, thereby reducing the flow rate of the gas-liquid mixture passing through the first flow passages of the separation discs above, increasing the flow rate of the gas-liquid mixture passing through the first flow passages of the separation discs below, so that the separation discs can be fully utilized to thereby promote flow balance, while also improving separation effect and separation efficiency.
Drawings
FIG. 1 is a schematic cross-sectional view of a centrifugal separator according to an embodiment of the invention;
FIG. 2 is a schematic view of a stack of two separate disks in a stack according to an embodiment of the present invention;
FIG. 3 is a schematic view of the structure of a separator plate in a stack according to an embodiment of the present invention;
FIG. 4 is a schematic view of the structure of a first platen in a centrifugal separator according to an embodiment of the present invention;
FIG. 5 is a schematic view of the structure of a second platen in a centrifugal separator according to an embodiment of the present invention;
FIG. 6 is a schematic view showing the external structure of a centrifugal separator according to an embodiment of the invention;
FIG. 7 is a schematic cross-sectional view of a cyclone in a centrifugal separator according to an embodiment of the invention;
FIG. 8 is a schematic diagram of a force analysis of a droplet on a separation disc;
Fig. 9 is a schematic view of the flow of the gas-liquid when the gas inlet and the gas outlet are provided on the upper and lower sides of the housing, respectively.
In the figure, 1, a separating disc; 100 parts of a first through hole, 101 parts of a first runner, 2 parts of a separation gap, 3 parts of a drainage rib, 4 parts of a first pressing plate, 400 parts of a second through hole, 5 parts of a second pressing plate, 500 parts of a third through hole, 501 parts of a second runner, 6 parts of a shaft sleeve, 7 parts of an annular sleeve, 8 parts of a fan blade, 9 parts of a shell, 10 parts of a rotating shaft, 11 parts of an air inlet, 12 parts of an air outlet, 13 parts of a throttling rib, 14 parts of a cyclone part, 15 parts of a turbulent flow part.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a repetitive description thereof will be omitted.
The words expressing the positions and directions described in the present invention are described by taking the drawings as an example, but can be changed according to the needs, and all the changes are included in the protection scope of the present invention.
The invention provides a stack for a centrifugal separator, comprising a number of separation discs 1 stacked one after the other.
As shown in fig. 1 and 2, after stacking each two adjacent separation discs 1, a separation gap 2 for separating the gas-liquid mixture is formed, a first through hole 100 and a plurality of first flow passages 101 surrounding the first through hole 100 are arranged in an opening at the upper end of the separation disc 1, the first through holes 100 of each separation disc 1 are correspondingly arranged, the first flow passages 101 on each separation disc 1 are correspondingly arranged, and the sum of the cross-sectional areas of the first flow passages 101 of the separation discs 1 from top to bottom along the stacking direction of the stacked body tends to increase. In other words, the sum of the cross-sectional areas of the first flow channels 101 of the upper separation discs 1 is small and the sum of the cross-sectional areas of the first flow channels 101 of the lower separation discs 1 is large, as seen in the whole.
Specifically, as the first structure, the plurality of separation discs 1 are divided into a plurality of groups of separation discs 1 from top to bottom, the sum of the cross-sectional areas of the first flow passages 101 of the individual separation discs 1 in the lower group of separation discs 1 is larger than the sum of the cross-sectional areas of the first flow passages 101 of the individual separation discs 1 in the upper group of separation discs 1, the number of separation discs 1 in each group of separation discs 1 is the same or different, or as the second structure, the sum of the cross-sectional areas of the first flow passages 101 of the separation discs 1 is gradually increased from top to bottom. When the gas-liquid mixture enters from the first flow passage 101 of the separation disc 1 located at the lowermost position of the stack, a large amount of the gas-liquid mixture enters into the first flow passage 101 of the separation disc 1 located at the upper position of the stack under the action of the gas flow inertia, but by adopting the stack of the two structures, the sum of the cross-sectional areas of the first flow passages 101 of the separation disc 1 from top to bottom has a tendency to increase along the stacking direction of the stack, thereby reducing the flow rate of the gas-liquid mixture passing through the first flow passage 101 of the separation disc 1 above, increasing the flow rate of the gas-liquid mixture passing through the first flow passage 101 of the separation disc 1 below, thereby realizing the reduction of the flow rate passing through the separation gap 2 between the separation discs 1 above the stack, increasing the flow rate passing through the separation gap 2 between the separation discs 1 below the stack, and finally realizing the beneficial effects that all the separation discs 1 in the stack can be fully utilized, not only the flow rate balance can be promoted, but also the separation effect and the separation efficiency can be improved.
As a further implementation of the present embodiment, the sum of the cross-sectional areas of the first flow channels 101 of the separation discs 1 located at the top of the stack is 1000mm 2, the sum of the cross-sectional areas of the first flow channels 101 of the separation discs 1 located at the bottom of the stack is 1600mm 2, and the sum of the cross-sectional areas of the first flow channels 101 increases by 24-30mm 2 in order along the stacking direction of the stack, by adopting the above-described structure, and when the rotational speed of the stack is 7000 revolutions per minute, the separation gap 2 between each two separation discs 1 separates 5-10L of gas-liquid mixture per minute, and the stack adopting the present embodiment greatly improves the separation effect and separation efficiency compared with the prior art.
As a further implementation manner of this embodiment, as shown in fig. 2 and 3, the separating disc 1 has a hollow truncated cone-shaped structure, the upper and lower ends of the separating disc 1 are provided with openings that are mutually communicated, a first through hole 100 and a plurality of first flow passages 101 that are arranged around the first through hole 100 are arranged in the opening at the upper end of the separating disc 1, the rotating shaft 10 is used for penetrating the first through hole 100, and the rotating shaft 10 drives all the separating discs 1 to rotate.
In the present invention, the rotation speed of the rotation shaft 10 may be 6500 to 7500 rpm, for example 7000 rpm, and by reducing the rotation speed, damage to the bearing supporting the rotation shaft 10 can be significantly reduced and the reliability of the centrifugal separator can be significantly improved, compared to the conventional rotation speed of up to 1 ten thousand rpm. The number of the separation discs 1 of the stack may be 15-30, preferably 20-25, and compared with the number of the separation discs 1 of the existing 40-50, the volume and cost of the centrifugal separator can be reduced by reducing the number of the separation discs 1, so that the centrifugal separator can be assembled on more various engines, and the weight of the stack can be reduced by reducing the number of the separation discs 1, and the damage to the bearings can be reduced.
However, merely decreasing the rotation speed of the rotation shaft 10, decreasing the number of separation discs 1 and increasing the size of the separation gaps 2 between the separation discs 1 results in a decrease in separation efficiency, which is mainly due to the occurrence of flow imbalance, and also results in a decrease in negative pressure in the crankcase, which is easily caused by an overflow of liquid and gas, and a decrease in reliability.
Specifically, in the case where the number of the separation discs 1 is large and the separation gaps 2 between the separation discs 1 are small, the air flow resistance between the separation discs 1 is large, so that the air-liquid mixture can more easily pass through the separation gaps 2 between the separation discs 1 in the vertical direction uniformly, and the phenomenon of unbalanced flow is not obvious. When the number of separation discs 1 decreases and the separation gaps 2 between the separation discs 1 are increased, as shown in fig. 9, when the gas-liquid mixture flows from bottom to top through the flow passages of the stacked separation discs 1, the gas-liquid mixture tends to flow out through the separation gaps 2 between the separation discs 1 near the upper side more easily by the flow inertia, resulting in a large flow rate of the gas-liquid mixture between the separation discs 1 near the upper side, a small flow rate of the gas-liquid mixture between the separation discs 1 near the lower side, a phenomenon of flow imbalance is highlighted, and as a direct result of flow imbalance, the residence time of small droplets (about 1 μm) of the liquid in the gas-liquid mixture near the separation discs 1 near the upper side is shortened, causing the small droplets to fail to agglomerate into large droplets, making the small droplets more easily exit the centrifugal separator with the gas, and finally resulting in a decrease in separation efficiency.
More specifically, referring to fig. 8, fig. 8 is a schematic diagram of force analysis of the liquid droplets on the separation disc 1, the liquid droplets are subjected to drag force and inertia force toward the lower edge of the separation disc 1 and pressure gradient force toward the upper edge of the separation disc 1 on the separation disc 1, and the liquid droplets tend to stay on the separation disc 1 when the resultant force of the pressure gradient force and drag force and inertia force tends to be positive.
Drag force F d is
Wherein C d is the drag coefficient of the droplet, ρ is the density of the gas phase, v s＝v-vp is the difference between the velocity of the gas and the velocity of the oil droplet, v is the instantaneous velocity of the gas phase, v p is the instantaneous velocity of the oil droplet, and a p is the projected area of the droplet.
It can be seen that the drag force, i.e. the thrust/drag force of the gas phase against the droplet, is directed outwardly, proportional to the projected area of the droplet, depending on the droplet below/above the gas phase velocity. The smaller the radial velocity of the air flow, the smaller the drag force, the more beneficial the droplet to stay, and conversely the droplet escape increases. When the flow rate is unbalanced, the flow rate of the liquid in the gas-liquid mixture between the separation discs 1 near the upper increases, the drag increases, the liquid drops escape with acceleration, and the separation efficiency decreases.
Inertial force F MRF is F MRF＝mp[ω×(ω×r)+2(ω×Vp) ].
Where m p is the drop mass, ψ is the angular velocity vector of the rotating reference frame, r is the distance vector to the axis of rotation, V p is the drop volume.
Inertial forces include centrifugal forces, coriolis forces (ground deflection forces). The inertia force of the liquid drops on the separation disc is outwards and leftwards, is proportional to the mass of the liquid drops, and increases turbulent dissipation along with the decrease of the particle size, so that the influence of the inertia force is weakened.
The pressure gradient force F p is
Wherein V p is the volume of the droplet,Is the gradient of the static pressure in the gas phase.
The pressure gradient force is understood to be a generalized buoyancy force. The pressure gradient force of the liquid drops on the separation disc 1 is inward and is proportional to the volume of the liquid drops, the periphery of the separation disc 1 is easy to generate large pressure gradient, and the value depends on the rotating speed and the flow guiding structure. The pressure gradient force is increased, the drag force is reduced to a critical point, the liquid drops are suspended to form a concentrated area, the residence time is increased, and the agglomeration effect is enhanced.
From the above analysis, it can be seen how to improve the structure of the centrifugal separator by using a small number of separation discs 1 and a large separation disc 1 to separate the gaps 2, to balance the flow rate of the gas-liquid mixture between the separation discs 1, and to further increase the residence time of the small droplets of about 1 μm on the separation discs 1 is a key to improving the separation efficiency.
In the present invention, in order to maintain the centrifugal separator at a separation efficiency equivalent to that of the conventional centrifugal separator having a high rotation speed of the rotation shaft, a large number of separation discs 1 and a small separation disc 1 separation gap 2, without lowering the pressure rise too much, under the conditions of decreasing the rotation speed of the rotation shaft, decreasing the number of separation discs 1 and increasing the separation gap 2 of the separation discs 1, the present invention has made a series of improvements.
Specifically, in the case of decreasing the rotation speed of the rotating shaft, decreasing the number of separation discs 1, and increasing the separation gaps 2 between the separation discs 1, when the gas-liquid mixture flows from bottom to top, the gas-liquid mixture tends to flow out by the flow inertia from top to bottom, so that the flow rate of the gas-liquid mixture near the upper separation discs 1 is large, the flow rate of the gas-liquid mixture near the lower separation discs 1 is small, and thus the flow imbalance phenomenon occurs, in this embodiment, after the gas-liquid mixture enters the stack from the first flow channel 101 of the separation disc 1 located at the lowest part of the stack, the sum of the cross-sectional areas of the first flow channels 101 of the separation discs 1 from top to bottom tends to increase, and thus a part of the gas-liquid mixture is forcedly caused to enter the separation gaps 2 between the separation discs 1 located below, which avoids a large amount of the gas-liquid mixture from entering the corresponding separation gaps 2 through the first flow channel 101 located above the stack, so that the flow rate of the gas-liquid mixture entering the stack is caused to enter the separation gaps 2 located above the stack, and the separation discs 2 tend to increase the flow rate of the gas-liquid mixture entering the stack from bottom, and the separation gaps 2.
As a further implementation of this embodiment, as shown in fig. 3, a plurality of drainage ribs 3 are arranged on the inner side wall of the separation disc 1 at equal intervals or unequal intervals, the drainage ribs 3 extend from the upper end opening to the lower end opening of the separation disc 1, and the thickness of the drainage ribs is gradually thickened from top to bottom, the arrangement of the structure gradually reduces the airflow pressure between the separation discs 1, improves the pressure gradient force of the liquid drops, gradually reduces the pressure from the inlet in the separation gap 2 to the outlet in the separation gap 2, thereby reducing the circulation speed of the gas-liquid mixture, enabling the residence time of the gas-liquid mixture in the separation gap 2 between the separation discs 1 to be longer, and the small liquid drops are more easily agglomerated into large liquid drops, thereby improving the separation effect.
As a further implementation manner of this embodiment, the drainage ribs 3 are arc-shaped, and the bending direction of the drainage ribs 3 is consistent with the direction of the gas-liquid flow on the separation disc 1 when the separation disc 1 rotates, and the arrangement of this structure makes the gas-liquid mixture collide with the drainage ribs 3 and flow out from the separation gap 2 after entering the separation gap 2 between the two separation discs 1 when the separation disc 1 rotates, so that the flow path of the gas-liquid mixture is changed, and the gas-liquid separation effect is effectively improved.
The invention also provides a centrifugal separator comprising a stack of any of the above.
As a further implementation of this embodiment, as shown in fig. 1 and 4 to 6, the centrifugal separator comprises a first pressing plate 4 and a second pressing plate 5 which are in a hollow truncated cone-shaped structure, the first pressing plate 4 is sleeved above the separation disc 1 positioned at the top of the stacked body and at least covers the first flow channel 101, a second through hole 400 corresponding to the position of the first through hole 100 is arranged on the first pressing plate 4 from top to bottom in a penetrating manner, the second pressing plate 5 is sleeved below the separation disc 1 at the bottom of the stacked body, openings communicated with each other are arranged at the upper end and the lower end of the second pressing plate 5 in a penetrating manner, a third through hole 500 and a plurality of second flow channels 501 distributed around the third through hole 500 are arranged in the opening at the upper end of the second pressing plate 5, the third through hole 500 corresponds to the position of the first through hole 100, the first flow channel 101 corresponds to the position of the second flow channel 501, the centrifugal separator further comprises a shell 9, a rotating shaft 10 and a driving part which is not shown in the figure and is used for driving the rotating shaft 10, the shell 9 comprises an air inlet 11, an air outlet 12 and a liquid outlet hole 12 are arranged in the figure and a throttling part which is arranged on the shell 9 and is arranged at least near the outer side of the second through the rotating plate 1 and the rotating shaft 10, the outer side of the separation disc 1, and the rotating part is arranged near the air inlet 1 and the air outlet 1, and the air outlet port 1is arranged near the rotating part of the rotating shaft 1, and the rotating part of the rotating part is arranged near the rotating shaft 1 at least the air outlet 1, and the air outlet port 1 and the upper end of the second flow outlet part is arranged near the air outlet 1 and the air outlet port 1, the throttling effect of the throttle rib 13 of the separation disc 1 near the upper end of the housing 9 on the gas-liquid mixture is larger than the throttling effect of the throttle rib 13 of the separation disc 1 near the lower end of the housing 9 on the gas-liquid mixture, in the prior art, a large amount of gas-liquid mixture flows into the corresponding separation gap 2 through the first flow passage 101 of the separation disc 1 near the upper end of the housing 9, and a small amount of gas-liquid mixture flows into the corresponding separation gap 2 through the first flow passage 101 of the separation disc 1 near the lower end of the housing 9, thereby resulting in a situation that the flow rate is unbalanced, whereas in the present embodiment, in order to fully exert the effect of each separation disc 1, the throttling effect of the throttle rib 13 of the separation disc 1 on the gas-liquid mixture is gradually decreased in the direction from the upper end to the lower end of the housing 9, and the throttling effect is large, meaning that the flow rate of the gas-liquid mixture entering the separation gap 2 between the separation discs 11 is smaller, and the throttling effect is smaller, meaning that the flow rate of the gas-liquid mixture entering the separation gap 2 between the separation discs 1is smaller, and the throttling effect is gradually decreased, thereby achieving a flow balance.
As a further embodiment of the present example, the throttling effect of the throttle rib 13 of the separation disc 1 on the gas-liquid mixture gradually decreases in the direction from the upper end to the lower end of the housing 9.
As a further implementation manner of this embodiment, as shown in fig. 1, the centrifugal separator further includes a turbulence member 15, where the turbulence member 15 is disposed in the air inlet 11 and the air outlet 12, respectively, the turbulence member 15 is configured to collide with the air-liquid mixture entering the air inlet 11 and the air-liquid mixture entering the air outlet 12, the turbulence member 15 is detachably disposed in the air inlet 11 and the air outlet 12, the turbulence member 15 and the air flow direction form an acute angle, the turbulence member 15 disposed at the air inlet 11 can be added into the air-liquid mixture, and can also perform a supercharging function, so that a higher pressure rise can be maintained between the air inlet 11 and the air outlet 12 of the centrifugal separator, and at the same time, the turbulence member 15 can collide with the air-liquid mixture entering the air inlet 11 to realize an initial separation of the air-liquid mixture, and the turbulence member 15 disposed in the air outlet 12 can collide with the liquid which is not separated from the air, thereby improving the separation effect.
As a further implementation manner of this embodiment, as shown in fig. 7, the bottom of the casing 9 is further provided with a cyclone part 14 having archimedes 'spiral, the cyclone part 14 and the bottom of the casing 9 are integrated to form the cyclone part 14, and no separate cyclone part 14 is required to be provided, so that the internal structure and space of the casing 9 are fully utilized, the integration degree is high, the space occupation is small, the cyclone part 14 is communicated with the air inlet 11, the air-liquid mixture enters the cyclone part 14 through the air inlet 11 to form a vortex airflow flow path, the liquid after being separated by the cyclone cavity in an accelerating way, part of liquid particles with larger mass are separated in the cyclone cavity and flow out from the liquid outlet in the cyclone part 14, and the rest of the air-liquid mixture enters the inside of the casing 9 in a rotating way and finally passes through the separation disc 1 to be separated to the inner side wall of the casing, and the flow channel of the archimedes' spiral structure is adopted, so that not only the separation efficiency is high, but also the air flow can be accelerated, a better supercharging effect is played, and the effect between the air inlet 11 and the centrifugal separator can be kept high under the conditions of reducing the rotation speed of the rotating shaft 10, reducing the number of the separation disc 1 and increasing the separation gap 2 of the separation disc 1.
As a further implementation manner of this embodiment, as shown in fig. 1 and 5, a shaft sleeve 6 and an annular sleeve 7 located outside the shaft sleeve 6 are coaxially disposed in the upper end opening of the second pressing plate 5, the annular sleeve 7 is formed by extending downward from the inner circumference of the upper end opening of the second pressing plate 5, a plurality of radially extending fan blades 8 with blade inclination angles are uniformly distributed on the outer circumference of the shaft sleeve 6, it should be noted that, in fig. 5, the inclined lines on the fan blades 8 are not section lines, in order to highlight the specific structure and position of the fan blades 8, one end of the fan blades 8 away from the shaft sleeve 6 is connected with the inner side wall of the annular sleeve 7, a third through hole 500 is formed on the shaft sleeve 6 and extends from the top of the shaft sleeve 6 to the bottom of the shaft sleeve 6, a second flow channel 501 is formed between two adjacent fan blades 8, and the fan blades 8 are used for turbulence and pressurization of the gas-liquid mixture flowing through the second flow channel 501 after the second pressing plate 5 rotates.
Specifically, the driving piece drives the rotation shaft 10 to rotate, the rotation of the rotation shaft 10 drives the first pressing plate 4, the second pressing plate 5 and the separation disc 1 to rotate, when the gas-liquid mixture enters from the air inlet 11, the rotation of the second pressing plate 5 drives the fan blades 8 to rotate, so that the fan blades 8 not only play a role of pumping the gas-liquid mixture upwards, but also can flow the gas-liquid mixture upwards rapidly, turbulence the gas-liquid mixture can be carried out, the gas-liquid mixture can flow upwards spirally, the fan blades 8 can collide with the gas-liquid mixture and separate part of the gas-liquid mixture in advance, the collision opportunity of the gas-liquid mixture is increased by the arrangement of the fan blades 8, the separation efficiency is improved, and the centrifugal separator has a certain effect on improving the pressure of the gas-liquid mixture, so that higher pressure between the air outlet 12 and the air inlet 11 of the centrifugal separator can be kept.
To further demonstrate the separation effect of this embodiment, the centrifugal separator of the prior art (the sum of the cross-sectional areas of the first flow passages of the separation discs 1 from top to bottom in the stacking direction of the stacks is the same) was compared with the separator of this embodiment by changing the inlet air flow rate under the same conditions of the remaining parameters, as follows:
| Intake air flow/LPM | 100 | 150 | 200 | 250 | 300 |
| Separation efficiency of the prior art | 98.6% | 95.5% | 92.7% | 89.7% | 86.4% |
| Separation efficiency of the present embodiment | 99.2% | 96.9% | 94.8% | 92% | 89.1% |
As can be seen from the above data comparison, the centrifugal separator of the present embodiment has better separation efficiency than the centrifugal separator in which the sum of the cross-sectional areas of the first flow passages of the separation discs does not have a tendency to increase from top to bottom in the stacking direction of the stacked body, and with the centrifugal separator of the present embodiment, the smaller the intake air flow rate, the better the separation effect.
While embodiments of the present invention have been shown and described, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that changes, modifications, substitutions and alterations may be made therein by those of ordinary skill in the art without departing from the spirit and scope of the invention, all such changes being within the scope of the appended claims.
Claims (7)
1. The stacking body is characterized by comprising a plurality of sequentially stacked separation discs, separation gaps for separating a gas-liquid mixture are respectively formed after each two adjacent separation discs are stacked, a first through hole and a plurality of first flow passages surrounding the first through hole are arranged in an opening at the upper end of each separation disc, the first through holes of each separation disc are correspondingly arranged, the first flow passages on each separation disc are correspondingly arranged, and the sum of the cross-sectional areas of the first flow passages of the separation discs is in a trend of increasing along the stacking direction of the stacking body from top to bottom;
The stacking direction of the stacking body is a gas flow direction, and the direction from top to bottom is opposite to the gas flow direction;
The number of the separation discs is divided into a plurality of groups of separation discs from top to bottom, the sum of the cross-sectional areas of the first flow channels of the single separation discs in the lower group of separation discs is larger than the sum of the cross-sectional areas of the first flow channels of the single separation discs in the upper group of separation discs, the number of the separation discs in each group of separation discs is the same or different, or the sum of the cross-sectional areas of the first flow channels of the separation discs in each group of separation discs is gradually increased from top to bottom.
2. The stack according to claim 1, characterized in that the sum of the cross-sectional areas of the first flow channels of the separation discs at the top of the stack is 1000mm 2 and the sum of the cross-sectional areas of the first flow channels of the separation discs at the bottom of the stack is 1600mm2, the sum of the cross-sectional areas of the first flow channels increasing in sequence from top to bottom in the stacking direction of the stack by 24-30mm2.
3. The stack according to claim 1, wherein the separating discs are of hollow truncated cone-like structure, and the upper and lower ends of the separating discs are provided with mutually communicating openings.
4. A stack according to claim 3, characterized in that the separation discs are provided with drainage ribs at equal or unequal intervals on the inner side walls of the separation discs, which drainage ribs extend from the upper end opening to the lower end opening of the separation discs and which are gradually thicker from top to bottom.
5. A centrifugal separator comprising a stack according to any one of claims 1-4.
6. The centrifugal separator according to claim 5, wherein the centrifugal separator comprises a first pressing plate and a second pressing plate, the first pressing plate and the second pressing plate are in a hollow truncated cone-shaped structure, the first pressing plate is sleeved above a separating disc arranged at the top of the stacked body and at least covers the first flow passage, a second through hole corresponding to the first through hole is formed in the first pressing plate in a penetrating mode from top to bottom, the second pressing plate is sleeved below the separating disc arranged at the bottom of the stacked body, communicating openings are formed in the upper end and the lower end of the second pressing plate in a penetrating mode, a third through hole and a plurality of second flow passages distributed around the third through hole are arranged in the opening at the upper end of the second pressing plate, the third through hole corresponds to the first through hole, and the first flow passage corresponds to the second flow passage.
7. A centrifugal separator according to claim 6, further comprising a housing and a rotating shaft, said housing comprising an air inlet, an air outlet and a liquid outlet, said air outlet being located near the upper end of said housing, said air inlet and said liquid outlet being located near the lower end of said housing, said separating discs being stacked on said rotating shaft, said rotating shaft being adapted to rotate said first pressure plate, said second pressure plate and said plurality of separating discs so that the gas-liquid mixture entering from said air inlet is separated by centrifugal separation of said separating discs, the separated gas being discharged outwards through said air outlet, said separated liquid being discharged outwards through said liquid outlet, at least part of the outer side walls of said separating discs being provided with throttling ribs, the throttling of said gas-liquid mixture by said throttling ribs of said separating discs near the upper end of said housing being greater than the throttling of said gas-liquid mixture by said throttling of said separating discs near the lower end of said housing.
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| CN202211328026.XA CN116181448B (en) | 2022-10-27 | 2022-10-27 | A stacking body and centrifugal separator |
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| CN216198373U (en) * | 2021-07-06 | 2022-04-05 | 上海大创汽车技术有限公司 | Gas-liquid separator and engine system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| SE532915C2 (en) * | 2008-09-30 | 2010-05-04 | Alfa Laval Corp Ab | Centrifuge rotor disk package |
| EP3178565B1 (en) * | 2012-05-14 | 2018-06-27 | Alfa Laval Corporate AB | Disc stack for centrifugal separator |
| EP3085450B1 (en) * | 2015-04-24 | 2020-02-26 | Alfa Laval Corporate AB | Centrifugal separator with disc stack |
| CN204646363U (en) * | 2015-05-28 | 2015-09-16 | 长城汽车股份有限公司 | Deaerator and motor |
| CN109311032B (en) * | 2016-05-23 | 2021-04-16 | 东京滤器株式会社 | Separation disc stack |
| EP3315204B1 (en) * | 2016-10-31 | 2019-05-08 | Alfa Laval Corporate AB | A stack of separation discs |
| PL3398686T3 (en) * | 2017-05-02 | 2020-12-28 | Alfa Laval Corporate Ab | A separation disc for a centrifugal separator |
| WO2019121417A1 (en) * | 2017-12-19 | 2019-06-27 | Tetra Laval Holdings & Finance S.A. | Separating milk |
| DE102018105586A1 (en) * | 2018-03-12 | 2019-09-12 | Hengst Se | Rotor of a centrifugal separator and centrifugal separator |
| CN212309091U (en) * | 2020-01-16 | 2021-01-08 | 安徽威尔低碳科技股份有限公司北京分公司 | Separation blade and blade group suitable for centrifugal oil-gas separator |
| CN216198374U (en) * | 2021-07-06 | 2022-04-05 | 上海大创汽车技术有限公司 | Gas-liquid separator and engine system |
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| CN216198373U (en) * | 2021-07-06 | 2022-04-05 | 上海大创汽车技术有限公司 | Gas-liquid separator and engine system |
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