CN113175771A

CN113175771A - Gas-liquid separator

Info

Publication number: CN113175771A
Application number: CN202110337883.5A
Authority: CN
Inventors: 董军启; 王义彪; 王美; 董海锋
Original assignee: Sanhua Holding Group Co Ltd
Current assignee: Sanhua Holding Group Co Ltd
Priority date: 2021-03-30
Filing date: 2021-03-30
Publication date: 2021-07-27

Abstract

A gas-liquid separation device, comprising: barrel, end cover and sleeve pipe, the sleeve pipe includes inner tube and outer tube, the inner tube is equipped with interior lumen, the outer tube is equipped with outer lumen, the outer tube includes diapire and lateral wall, lateral wall one end is connected with the diapire, the lateral wall is formed with first opening at the other end, first opening and first barrel intercommunication, the inner tube includes first end and second tip, first end is located the inner tube intracavity, the second tip is located outside the inner tube chamber. The outer tube comprises a bottom oil return hole and a side oil return hole, the height of the side oil return hole is higher than that of the bottom oil return hole, when the system is used for refrigerating, lubricating oil returns to the compressor from the bottom oil return hole, and when the system is used for heating, the lubricating oil returns to the compressor from the side oil return hole.

Description

Gas-liquid separator

Technical Field

The application relates to the technical field of refrigeration equipment, in particular to a gas-liquid separation device.

Background

The gas-liquid separation device in the related art comprises a sleeve, wherein the sleeve comprises an inner pipe and an outer pipe, an oil return hole is formed in the bottom wall of the outer pipe, when the compressor is in a refrigerating working condition, the flow of refrigerant circulating by a system is large, the number of the refrigerant stored in the gas-liquid separation device is small, the density of lubricating oil is slightly larger than that of the liquid refrigerant, and the lubricating oil can smoothly return to the compressor through the oil return hole in the bottom. During the heating working condition, the flow rate of the refrigerant of the system circulation is small, more refrigerants are stored in the gas-liquid separation device, the density of the lubricating oil is smaller than that of the liquid refrigerant, the lubricating oil floats above the liquid refrigerant, the height difference between the lubricating oil and an oil return hole at the bottom is large, the lubricating oil is not beneficial to returning to the compressor, and the performance of the compressor is greatly attenuated.

Disclosure of Invention

The application aim at provides one kind and can both make lubricating oil get back to the gas-liquid separation who compressors in refrigeration and heating different operating modes.

A gas-liquid separation device, comprising: the gas-liquid separation device comprises a cylinder, an end cover and a sleeve, wherein the end cover is arranged at the end part of the cylinder in the length direction, the wall part of the end cover is in sealing connection with the wall part of the cylinder, the gas-liquid separation device is provided with a first cylinder cavity, and at least part of the sleeve is positioned in the first cylinder cavity;

the sleeve comprises an inner tube and an outer tube, the inner tube is provided with an inner tube cavity, the outer tube is provided with an outer tube cavity, the outer tube comprises a bottom wall and a side wall, one end of the side wall is connected with the bottom wall, a first opening is formed in the other end of the side wall, the first opening is communicated with the first tube cavity, the bottom wall comprises a first bottom wall surface and a second bottom wall surface which are arranged in the thickness direction of the bottom wall, the second bottom wall surface faces the inner tube cavity, and the first bottom wall surface faces away from the inner tube cavity;

the inner tube comprises a first end part and a second end part, the first end part is positioned in the inner tube cavity, the second end part is positioned outside the inner tube cavity, the first end part is arranged close to the bottom wall relative to the second end part, the second end part is arranged close to the first opening relative to the first end part, the first end part is provided with a second opening, the second end part is provided with a third opening, the second opening is communicated with the inner tube cavity and the outer tube cavity, and the inner tube cavity is communicated with the second opening and the third opening;

the end cover is provided with a first channel and a second channel, the first channel is communicated with the first cylinder cavity, and the third opening is communicated with the second channel;

the outer tube comprises a first area and a second area which are arranged along the length direction of the outer tube, the maximum distance from the first bottom wall surface of the first area is 1/3 the length of the outer tube, the minimum distance from the first bottom wall surface of the second area is 1/3 the length of the outer tube, and the maximum distance from the first bottom wall surface of the second area is 9/10 the length of the outer tube;

the outer pipe is provided with a first oil return hole and a second oil return hole, the first oil return hole is communicated with the first cylinder cavity and the outer pipe cavity, the second oil return hole is communicated with the first cylinder cavity and the outer pipe cavity, and the first oil return hole is arranged on the bottom wall or is arranged in a first area of the side wall;

the second oil return hole is arranged in a second area of the side wall.

Compared with the prior art, the gas-liquid separation device comprises the first oil return hole and the second oil return hole, the first oil return hole is formed in the bottom wall or the side wall close to the bottom wall, the second oil return hole is formed in the side wall far away from the bottom wall relative to the first oil return hole, and the first oil return hole and the second oil return hole are respectively used for returning lubricating oil under the refrigeration working condition and the heating working condition to the compressor.

Drawings

Fig. 1 is a schematic perspective view of a gas-liquid separation apparatus according to the present application.

Fig. 2 is an exploded schematic view of the gas-liquid separation device shown in fig. 1.

Fig. 3 is an exploded view of the gas-liquid separation device shown in fig. 1 from another perspective.

Fig. 4 is a schematic perspective sectional view of the gas-liquid separation device shown in fig. 1.

Fig. 5 is a further exploded schematic view of the gas-liquid separation device shown in fig. 2.

Fig. 6 is a schematic perspective view of the gas-liquid separation device shown in fig. 5, with the end cap and the outer cylinder omitted.

Fig. 7 is an exploded schematic view of the gas-liquid separation device shown in fig. 6.

Fig. 8 is an exploded schematic view of the gas-liquid separating member shown in fig. 7.

Fig. 9 is an exploded view of the sleeve and screen assembly shown in fig. 8.

Fig. 10 is a schematic perspective cross-sectional view of the sleeve and screen assembly shown in fig. 8.

Fig. 11 is a schematic cross-sectional view of the cannula shown in fig. 8.

FIG. 12 is a schematic cross-sectional view of another embodiment of a cannula according to the present application.

FIG. 13 is a schematic cross-sectional view of yet another embodiment of a cannula according to the present application.

Fig. 14 is an exploded view of the heat exchange assembly and baffle shown in fig. 8.

Fig. 15 is a schematic perspective sectional view of the gas-liquid separation device shown in fig. 1.

Fig. 16 is a schematic view showing the flow of the refrigerant in the operating state of the gas-liquid separator shown in fig. 4.

Fig. 17 is a schematic view showing the flow of the refrigerant in the operating state of the gas-liquid separator shown in fig. 6.

FIG. 18 is a schematic diagram of a thermal management system of the present application.

Detailed Description

As shown in fig. 1 to 4, a gas-liquid separation apparatus 100 according to the present application includes: the end cap 20 is connected to the end of the cylinder 10 in the longitudinal direction, and the wall of the end cap 20 is hermetically connected to the wall of the cylinder 10.

As shown in fig. 4, the gas-liquid separation device 100 has a first cylindrical cavity 110, and the sleeve 30 is at least partially located in the first cylindrical cavity 110.

As shown in fig. 7 to 10, the sleeve 30 includes an inner tube 31 and an outer tube 32, the inner tube 31 being provided with an inner lumen 310, and the outer tube 32 being provided with an outer lumen 320. The outer tube 32 includes a bottom wall 321 and a side wall 324, one end of the side wall 324 is connected to the bottom wall 321, the side wall 324 is formed with a first opening 325 at the other end, and the first opening 325 is communicated with the first cylinder chamber 110. The bottom wall 321 includes a first bottom wall surface 322 and a second bottom wall surface 323 arranged in a thickness direction of the bottom wall 321, the second bottom wall surface 323 faces the outer tubular chamber 320, and the first bottom wall surface 322 faces away from the outer tubular chamber 320.

Inner tube 31 includes a first end 311 and a second end 312, first end 311 being located within outer lumen 320 and second end 312 being located outside outer lumen 320. The first end 311 is disposed adjacent the bottom wall 321 relative to the second end 312, and the second end 312 is disposed adjacent the first opening 325 relative to the first end 311. The first end portion 311 is provided with a second opening 313, the second end portion 312 is provided with a third opening 314, and the outer diameter of the second end portion 312 is substantially equal to the outer diameter of the first end portion 311, so that the inner tube 31 has a cylindrical shape. The outer diameter of the top of the outer tube 32 is larger than the outer diameter of the bottom of the outer tube 32, so that the outer tube 32 has a trumpet shape, which is advantageous for the inflow of the gaseous refrigerant. The second opening 313 communicates the outer lumen 320 with the inner lumen 310, and the inner lumen 310 communicates the second opening 313 with the third opening 314.

The first end 311 of the inner tube 31 also has a balancing hole 317. referring to fig. 11, the balancing hole 317 is located at least partially above the outer tube 32 to balance the atmospheric pressure inside and outside the inner tube 31.

As shown in fig. 2 to 4, the end cap 20 has a first passage 201 and a second passage 202, the first passage 201 communicates with the first cylinder chamber 110, a third opening 314 communicates with the inner tube chamber 310, and the third opening 314 communicates with the second passage 202.

As shown in fig. 11, the outer tube 32 includes a first region S1 and a second region S2 arranged in the length direction of the outer tube 32, the maximum distance of the first region S1 from the first bottom wall surface 322 is 1/3 of the length H of the outer tube 32, the minimum distance of the second region S2 from the first bottom wall surface 322 is 1/3 of the length H of the outer tube 32, and the maximum distance of the second region S2 from the first bottom wall surface 322 is 9/10 of the length H of the outer tube 32.

As shown in fig. 11, the outer tube 32 has a first oil return hole 328 and a second oil return hole 329, the first oil return hole 328 communicating the first cylinder chamber 110 and the outer tube chamber 320, and the second oil return hole 329 communicating the first cylinder chamber 110 and the outer tube chamber 320. The first oil return hole 328 is provided in the bottom wall 321, and the second oil return hole 329 is provided in the second region S2 of the side wall 324. Alternatively, as shown in fig. 12, the first oil return hole 328 is provided in the first region S1 of the side wall 324, and the second oil return hole 329 is provided in the second region S2 of the side wall 324. Alternatively, as shown in fig. 13, the first oil return hole 328 is provided in the first region S1 and the bottom wall 321 of the side wall 324, and the second oil return hole 329 is provided in the second region S2 of the side wall 324.

In the cooling mode, the refrigerant flow rate of the system cycle is large, the refrigerant stored in the gas-liquid separation device 100 is small, and the density of the lubricating oil is slightly greater than that of the liquid refrigerant (for example, CO2 refrigerant), and the lubricating oil can smoothly return to the compressor through the first oil return hole 328 at the bottom.

In the heating mode, the refrigerant flow rate of the system circulation is small, more refrigerants are stored in the gas-liquid separation device 100, the density of the lubricating oil is smaller than that of the liquid refrigerant (for example, CO2 refrigerant), the lubricating oil floats above the liquid refrigerant, and the height difference between the lubricating oil and the first oil return hole 328 at the bottom is large, which is not beneficial for the lubricating oil to return to the compressor.

In the gas-liquid separator 100, the liquid refrigerant (for example, CO2 refrigerant) is immiscible with the compressor lubricant oil, resulting in stratification. The liquid refrigerant is divided into an oil-rich refrigerant rich in oil and an oil-lean refrigerant containing little oil. In summer, the oil-rich refrigerant is at the bottom of the gas-liquid separation device 100, and the return oil of the compressor returns through the first oil return hole 328 at the bottom of the gas-liquid separation device 100 to ensure the lubrication and the sealing of the compressor. In the working condition of heating in winter and the working condition of 10 ℃ below zero under the low pressure of the ambient temperature, the density of the liquid refrigerant (such as CO2 refrigerant) is greater than that of the lubricating oil, the bottom of the inner cylinder 11 of the gas-liquid separation device 100 is the lean liquid refrigerant (such as CO2 refrigerant), and the oil-rich layer is positioned at the upper part of the inner cylinder 11. Meanwhile, under the low-temperature working condition, the lubricating oil has high viscosity due to low temperature, is not beneficial to flowing of the lubricating oil, is difficult to return to the compressor from the air distribution, and greatly attenuates the performance of the compressor.

This application is provided with the second oil gallery 329 that is higher than first oil gallery 328 through the regional S2 in the second of outer tube 32, when the operating mode heats in winter, especially during the low temperature operating mode, lubricating oil flows to the bottom of outer tube 32 along the wall face of outer tube 32 in getting into outer tube 32 from upper portion second oil gallery 329, get into inner tube 31 under gaseous refrigerant' S velocity of flow effect, return the compressor, thereby the gas-liquid separation device 100 of this application has effectually guaranteed CO2 refrigerant when refrigerating and heating, lubricating oil can both normally return to the compressor, thereby the normal high-efficient operation of compressor has been ensured.

The maximum distance of the first region S1 from the first bottom wall surface 322 is 1/3 of the length of the outer tube 32, the minimum distance of the second region S2 from the first bottom wall surface 322 is 1/3 of the length of the outer tube 32, and the maximum distance of the second region S2 from the first bottom wall surface 322 is 9/10 of the length of the outer tube 32. The liquid refrigerant in the gas-liquid separation device 100 is not higher than the first region in summer, that is, the liquid refrigerant in the gas-liquid separation device 100 is lower than 1/3 of the height of the outer tube 32, and the lubricating oil and the top liquid refrigerant do not enter the outer tube 32 through the second oil return hole 329. In winter, the liquid refrigerant in the gas-liquid separation device 100 is higher than the first region and is located in the second region, that is, the liquid refrigerant in the gas-liquid separation device 100 is higher than 1/3 of the height of the outer tube 32 and lower than 9/10 of the height of the outer tube, so that the lubricating oil does not enter the outer tube 32 through the first oil return hole 328, and the lubricating oil enters the outer tube 32 through the second oil return hole 329, so as to return to the compressor. Therefore, the lubricating oil can be smoothly returned to the compressor through the first oil return hole 328 and the second oil return hole 329 no matter in the cooling or heating mode.

The second oil return hole 329 includes a first sub oil return hole 331, the minimum distance from the first sub oil return hole 331 to the first bottom wall surface 322 is L1, the length of the outer tube 32 is H, wherein L1/H is not less than 0.4 and not more than 0.5. In this range, the efficiency of the compressor is further ensured by the lubricant entering the outer tube 32 during the heating operation.

The second oil return hole 329 comprises a second sub oil return hole 332, the second sub oil return hole 332 is positioned above the first sub oil return hole 331, the minimum distance between the second sub oil return hole 332 and the first sub oil return hole 331 is L2, wherein L2/H is more than or equal to 0.1 and less than or equal to 0.2. In this range, the efficiency of the compressor is further ensured by the lubricant entering the outer tube 32 during the heating operation.

The second oil return hole 329 comprises a third sub oil return hole 333, the third sub oil return hole 333 is positioned above the second sub oil return hole 332, and the minimum distance between the second sub oil return hole 332 and the first sub oil return hole 331 in the length direction of the outer tube 32 is L3, wherein L3/H is not less than 0.1 and not more than 0.2. In this range, the efficiency of the compressor is further ensured by the lubricant entering the outer tube 32 during the heating operation.

The second oil return hole 329 includes a first sub oil return hole 331 and a second sub oil return hole 332, so that the lubricating oil can return to the compressor under different heating working conditions. The second oil return hole 329 comprises a first sub oil return hole 331, a second sub oil return hole 332 and a third sub oil return hole 333, so that the lubricating oil can return to the compressor under more different heating working conditions. The second oil return hole 329 may further include more sub oil return holes, and the principle is similar and will not be described again.

The first sub oil return hole 331, the second sub oil return hole 332 and the third sub oil return hole 333 are all round holes, the hole cross-sectional area of the second sub oil return hole 332 is larger than that of the first sub oil return hole 331, and the hole cross-sectional area of the third sub oil return hole 333 is larger than that of the second sub oil return hole 332. The diameter size range of the hole cross section of the first sub oil return hole 331 is 1.2-2.0 mm, the hole cross section area of the second sub oil return hole 332 is 1.5-2.5 times of the hole cross section area of the first sub oil return hole 331, and the hole cross section area of the third sub oil return hole 333 is 1.5-2.5 times of the hole cross section area of the second sub oil return hole 332. This is because, in the heating operation, if the more liquid refrigerant is stored in the gas-liquid separation device 100, the more the lubricant oil needs to be returned to the compressor, and in this case, the larger the cross-sectional area of the upper sub oil return hole is, the higher the efficiency of returning the lubricant oil to the compressor is. The first sub oil return hole 331, the second sub oil return hole 332, and the third sub oil return hole 333 may be 1 hole, or a combination of a plurality of holes, but the hole area does not exceed the size or area specified by the first sub oil return hole 331, the second sub oil return hole 332, and the third sub oil return hole 333.

As shown in fig. 2 to 5, the cylinder 10 includes an inner cylinder 11 and an outer cylinder 12, the outer cylinder 12 has a second cylinder chamber 120, the inner cylinder 11 has a first cylinder chamber 110, the inner cylinder 11 is located in the second cylinder chamber 120, and an interlayer chamber 122 is provided between an outer wall 111 of the inner cylinder 11 and an inner wall 121 of the outer cylinder 12. The interlayer cavity 122 communicates with the third opening 314, and the interlayer cavity 122 communicates with the second channel 202.

The gas-liquid separation device 100 further comprises a heat exchange assembly 40, the end cover 20 comprises a third channel 203 and a fourth channel 204, the heat exchange assembly 40 is provided with a flow channel 401 for flowing refrigerant, the flow channel 401 is communicated with the third channel 203 and the fourth channel 204, and the heat exchange assembly 40 is provided with a heat exchange main body portion 402 located in the interlayer cavity 122.

The end cap 20 comprises a first end cap 21 and a second end cap 22, the first end cap 21 and the second end cap 22 are welded on different sides of the outer cylinder 12 in the length direction, a first channel 201 and a third channel 203 are arranged on the first end cap 21, and a second channel 202 and a fourth channel 204 are arranged on the second end cap 22. The first cap 21 includes a first cap portion 211, a first connecting plate 212, and a second connecting plate 213, and the second cap 22 includes a second cap portion 221, a third connecting plate 222, and a fourth connecting plate 223. The first cover portion 211 and the second cover portion 221 are welded to opposite sides of the outer cylinder 12 in the longitudinal direction by welding such as laser welding.

The first connection plate 212 has a portion of the first passage 201, and the first lid portion 211 has a portion of the first passage 201. The first connection plate 212 and the first cap portion 211 may be a unitary structure formed by machining an aluminum ingot. The first connection plate 212 and the first cover portion 211 may be separate structures and connected together by welding.

The second connection plate 213 has a portion of the third channel 203 and the first cap portion 211 has a portion of the third channel 203. The second connecting plate 212 and the first cap portion 211 may be a unitary structure formed by machining an aluminum ingot. The second connecting plate 212 and the first cover portion 211 may be separate structures and connected together by welding.

The third web 222 has a portion of the second channel 202 and the second cap portion 221 has a portion of the first channel 202. The third connecting plate 222 and the second cap portion 221 may be a unitary structure formed by machining an aluminum ingot. The third connecting plate 222 and the second cover portion 211 may be separate structures and connected together by welding.

The fourth connecting plate 223 has a portion of the fourth channel 204 and the second cap portion 221 has a portion of the first channel 204. The fourth connecting plate 223 and the second cap portion 221 may be a unitary structure formed by machining an aluminum ingot. The fourth connecting plate 223 and the second cover portion 211 may be separate bodies and connected together by welding.

The first connection plate 212, the second connection plate 213, the third connection plate 222 and the fourth connection plate 223 are respectively used for connecting with connection pipelines in the system.

As shown in fig. 4 to 8, the inner cylinder 11 includes a cylinder 112, and the cylinder 112 has a closed lower end and an open upper end. The gas-liquid separator 100 further includes a cap 113 covering the upper end of the cylindrical body 112. The bottom of the barrel 112 is disposed adjacent the second end cap 22 relative to the cover 113, the cover 113 is disposed adjacent the first end cap 21 relative to the bottom of the barrel 112, and a compartment 123 is defined between the cover 113 and the first end cap 21. The cover 113 has a mounting hole 114, the second end 312 of the inner tube 31 is at least partially located in the mounting hole 114, the third opening 314 is in communication with the compartment 123, and the compartment 123 is in communication with the sandwich cavity 122.

The gas-liquid separation device 100 further includes a connection pipe 51, an umbrella cap 52, and a screen assembly 53. One end of the connecting pipe 51 is connected to the first end cap 21, the other end of the connecting pipe 51 is connected to the cover 113, and the connecting pipe 51 has a connecting pipe cavity 510 communicating the first passage 201 and the first cylinder cavity 110. In the illustrated embodiment, the connecting tube 51 is integrally formed with the cover 113 as a single piece. In other alternative embodiments, the connecting tube 51 may be provided as a single piece with the first end cap 21, or the connecting tube 51 may be a separate element assembled between the first end cap 21 and the cover 113. The connecting pipe 51 and the cover 113 are integrally arranged, so that the manufacture is relatively easy, and the assembly cost is relatively low.

The umbrella cap 52 is fixed between the cover 113 and the outer tube 32, and the umbrella cap 52 is at least partially disposed in the first cylindrical cavity 110. The umbrella cap 52 includes a disk 521, an extension 522 and a mounting portion 523, and an orthogonal projection of the connecting lumen 510 falls within an area of an orthogonal projection of the disk 521 on a plane perpendicular to a length direction of the connecting tube 51. The mounting portion 523 is mounted to the mounting hole 114, the mounting portion 523 is sandwiched between the second end 312 of the inner tube 31 and the hole wall 115 of the cover 113 in the mounting hole 114, the extending portion 522 extends from the disc portion 521 in a direction away from the mounting portion 523, and a gap 524 is provided between the extending portion 522 and the inner wall 121 of the inner cylinder 11. The extension portion 522 is asymmetrically arranged relative to the vertical central axis of the inner tube 31, which is beneficial to improving the gas-liquid separation effect of the refrigerant.

The screen assembly 53 is assembled and fixed to the bottom of the outer tube 32, and the screen assembly 53 is supported on the bottom of the inner cylinder 11. The top of the outer tube 32 is fixed to the first end cap 21 by a cap 113 and a connection tube 51 which are integrally provided.

As shown in fig. 10 and 11, the outer tube 32 includes a plurality of ribs 34 disposed at the bottom of the outer tube 32, the plurality of ribs 34 protruding inward along the sidewall 324 of the outer tube 32, and the plurality of ribs 34 being circumferentially spaced along the sidewall 324 of the outer tube 32. The plurality of protruding ribs 34 are uniformly distributed along the circumferential direction of the side wall 324 of the outer tube 32, each protruding rib 34 includes a first protruding portion 341, a second protruding portion 342, and a third protruding portion 343, which are sequentially connected from top to bottom, the radial minimum width of the first protruding portion 341 is smaller than the radial width of the second protruding portion 342, and the radial width of the third protruding portion 343 is larger than the radial width of the second protruding portion 342. The bottom surface 315 of the inner tube 31 is supported on the upper surfaces 344 of the third protrusions 343, and the side surfaces 316 of the inner tube 31 are limited on the inner surfaces 345 of the second protrusions 342.

The first protrusion 341 has a triangular shape with a small upper end and a large lower end, thereby facilitating insertion of the guide inner tube 31 from below. The inner wall 121 of the second protrusion 342 has a circular arc shape that fits the outer wall 111 of the inner tube 31, thereby radially limiting the inner tube 31. The third protrusion 343 protrudes inward relative to the second protrusion 342, and the top surface of the third protrusion 343 is matched with the bottom surface 315 of the inner cylinder 11, for example, both are planar, so as to facilitate axial positioning and supporting of the inner cylinder 11. When the first oil return holes 328 are disposed on the bottom wall 321 of the outer tube 32, the center of the first oil return holes 328 is concentric with the center of the bottom wall 321, the first oil return holes 328 are located at the center of the plurality of ribs 34, and the axial line of the first oil return holes 328 coincides with the axial line of the inner tube 31, so that oil return is easier.

As shown in fig. 9, the screen assembly 53 includes a frame body 531 and a plurality of screens 532, the frame body 531 includes a torus 533, a circular disk 534, and a plurality of spacers 535 connected between the torus 533 and the circular disk 534, a spacing hole 536 is formed between two adjacent spacers 535, and the screens 532 are disposed in the spacing holes 536. Outer tube 32 includes a ring of ribs 35 projecting outwardly from sidewall 324, and when screen assembly 53 is mounted to outer tube 32, ribs 35 and ring 533 limit the depth of installation of screen assembly 53. The frame body 531 may be formed of a plastic member, reducing weight. The filter screen 532 can be a metal filter screen 532, and the filtering performance of filtering impurities in the refrigerant is enhanced.

As shown in fig. 7 to 11, the gas-liquid separation device 100 further includes a bracket 62. The bracket 62 includes a plurality of bracket bodies 621, and the plurality of bracket bodies 621 are circumferentially arranged around the outer tube 30. The bracket 62 is used for limiting and supporting the outer tube 32 to the inner wall 121 of the outer cylinder 12, and reducing the shaking of the outer tube 32 and the sleeve 30 in the cylinder. In the illustrated embodiment, the plurality of holders 621 are formed as a single piece with the outer cylinder 12, thereby reducing the number of assembly processes. In an alternative embodiment, the plurality of frame bodies 621 of the frame 62 may be separately arranged, and the sleeve 30 is inserted into the preset central hole of the frame 62, so that the frame 62 supports and positions the sleeve 30. The first sub oil return hole 331, the second sub oil return hole 332, and the third sub oil return hole 333 of the second oil return hole 329 are all located above the frame body 621 of the bracket 62.

As shown in fig. 4 and 14, the heat exchange assembly 40 includes a header 41, a heat exchange tube 42 and fins 43, the header 41 has a third tube cavity 413 and a fourth tube cavity 414, the third tube cavity 413 is communicated with the third channel 203, the fourth tube cavity 414 is communicated with the fourth channel 204, the heat exchange tube 42 has a plurality of microchannel tube cavities 423, and the plurality of microchannel tube cavities 423 are communicated with the third tube cavity 413 and the fourth tube cavity 414.

In some embodiments, header 41 includes a first header 411 and a second header 412, the first header 411 having a third tube cavity 413, and the second header 412 having a fourth tube cavity 414. As shown in fig. 7, the inner cylinder 11 includes the avoiding portion 116 recessed into the first cylinder chamber 110, and the first header 411 and the second header 412 are provided in parallel in the avoiding portion 116, so that the space of the inner cylinder 11 is fully utilized, and the structure of the gas-liquid separation apparatus 100 can be made more compact.

As shown in fig. 4 and 6, the gas-liquid separation device 100 further includes a first connection pipe 54 and a second connection pipe 55, the first connection pipe 54 being connected to the end of the first header 411, and the second connection pipe 55 being connected to the end of the second header 412. The first adapter tube 54 is inserted into the third channel 203 of the first end cover 21, the first adapter tube 54 is fixedly connected with the first end cover 21 and is arranged in a sealing manner at the connection position, and the first adapter tube cavity 541 of the first adapter tube 54 is communicated with the third channel 203. The second connection tube 55 is inserted into the fourth channel 204 of the second end cap 22, the second connection tube 55 is fixedly connected with the second end cap 22, the connection position is sealed, and the second connection tube cavity 551 of the second connection tube 55 is communicated with the fourth channel 204.

As shown in fig. 5 to 7, the heat exchange tube 42 surrounds the upper half side of the inner cylinder 11, and the liquid refrigerant is stored in the lower half side of the inner cylinder 11 when the gas-liquid separation device 100 is in operation, so that the heat exchange tube 42 surrounds the upper half side of the inner cylinder 11, and the risk that the liquid refrigerant inside the inner cylinder 11 is heated and evaporated by the high-temperature refrigerant of the heat exchange tube 42 is reduced.

As shown in fig. 14, the heat exchange tube 42 includes a first flat tube 421 and a second flat tube 422, and the first flat tube 421 and the second flat tube 422 are spaced apart from each other. The two ends of the first flat pipe 421 are respectively connected to the first collecting pipe 411 and the second collecting pipe 412, and the micro-channel tube cavity 423 of the first flat pipe 421 is communicated with the third tube cavity 413 and the fourth tube cavity 414. The two ends of the second flat pipe 422 are respectively connected to the first collecting pipe 411 and the second collecting pipe 412, and the microchannel tube cavity 423 of the second flat pipe 422 is communicated with the third tube cavity 413 and the fourth tube cavity 414. The first flat pipe 421 and the second flat pipe 422 are micro-channel flat pipes.

As shown in fig. 6 and 14, the gas-liquid separation device 100 further includes a first baffle plate 55 and a second baffle plate 56, and the first baffle plate 55 and the second baffle plate 56 are held between the first header 411, the second header 412, and the outer cylinder 12. The first flow baffle 55 is located above the second flow baffle 56, the first flow baffle 55 and the second flow baffle 56 are identical or substantially similar in shape, and each of the first flow baffle 55 and the second flow baffle 56 includes a first contact portion 57 of the low-pressure heat exchange pipe 42, a second contact portion 58 of the pressure header 41, a third contact portion 59 in contact with the inner wall 121 of the outer cylinder 12, and a fourth contact portion 61 in contact with the fin 43. The first contact portion 57, the second contact portion 58 and the third contact portion 59 are all arc-shaped to respectively cooperate with the heat exchange tube 42, the header 41 and the inner wall 121 of the outer cylinder 12. The fourth contact portion 61 is flat, and is advantageous for pressing the fin 43.

The arrangement of the first flow baffle 55 and the second flow baffle 56 limits the refrigerant in the interlayer cavity 122 to exchange with the heat exchange tubes 42 and the fins 43, so that the risk that the refrigerant directly flows downwards through the collecting pipe 41 without passing through the heat exchange tubes 42 and the fins 43 for heat exchange is reduced.

As shown in fig. 14 and 15, the fin 43 is sandwiched between the heat exchange tube 42 and the outer wall 111 of the inner cylinder 11, or the fin 43 is sandwiched between the heat exchange tube 42 and the inner wall 121 of the outer tube 32. The fins 43 may be saw-tooth fins 43, louvered fins 43, or the like. The fins 43 enhance the disturbance of the refrigerant flowing in the interlayer cavity 122, thereby enhancing the heat exchange performance. Compared with the arrangement without the fins 43, the arrangement of the fins 43 has the advantage that the heat exchange tube 42 is directly abutted between the outer wall 111 of the inner cylinder 11 and the inner wall 121 of the outer cylinder 12, so that the flow resistance of the refrigerant is smaller, and the pressure drop is lower. Compared with the arrangement without fins, the fins 43 are wound by the spiral pipes and directly abut against the space between the outer wall 111 of the inner cylinder 11 and the inner wall 121 of the outer cylinder 12, so that the flow resistance of the refrigerant is smaller, and the pressure drop is lower.

As shown in fig. 16 and 17, the flow path of the refrigerant is schematically illustrated when the gas-liquid separator 100 is in an operating state, and the direction indicated by the arrow is the refrigerant flow direction. The high-pressure refrigerant enters the second connecting pipe cavity 551 of the second connecting pipe 55 from the fourth channel 204, enters the fourth pipe cavity 414 of the second collecting pipe 412, enters the third pipe cavity 413 of the first collecting pipe 411 through the microchannel pipe cavity 423 of the first flat pipe 421 and the second flat pipe 422, enters the third channel 203 through the first connecting pipe cavity 541 of the first connecting pipe 54, and flows out through the third channel 203.

The low-pressure refrigerant enters the connecting tube cavity 510 of the connecting tube 51 from the first channel 201, and after being separated by the umbrella cap 52, the liquid refrigerant falls into the bottom of the inner cylinder 11 due to the gravity, the gaseous refrigerant enters the outer tube cavity 320 from the first opening 325 of the outer tube 32, enters the inner tube cavity 310 from the second opening 313 of the inner tube 31, enters the spacing cavity 123 from the third opening 314 of the inner tube 31, flows into the interlayer cavity 122 to exchange heat with the high-pressure refrigerant in the heat exchange assembly 40, and then flows out from the second channel 202. The high-pressure refrigerant in the heat exchange assembly 40 flows from bottom to top, and the low-pressure refrigerant in the interlayer cavity 122 flows from top to bottom, so that countercurrent heat exchange is realized, and the heat exchange efficiency is higher during the heat exchange in the same direction relatively.

When the gas-liquid separation device 100 is used in a thermal management system, lubricating oil flows back to the compressor from the first oil return hole 328 when the system is cooled. When the system is heating, the lubricant oil flows back to the compressor from the second oil return hole 329.

Fig. 18 is a schematic connection diagram of a thermal management system 70 according to an exemplary embodiment of the present invention, in which the direction indicated by the arrow is a refrigerant flowing direction. The thermal management system 70 includes a compressor 71, a condenser 72, a throttle device 73, an evaporator 74, and a gas-liquid separation device 100.

When the thermal management system 70 works, a high-temperature high-pressure gaseous refrigerant compressed by the compressor 71 releases heat of the refrigerant to air or cooling liquid through the condenser 72, the refrigerant flows in from the fourth flow channel 204 of the gas-liquid separation device 100, flows out from the third channel 203 to the throttling device 73 after passing through the heat exchange assembly 40, the throttling device 73 throttles and reduces the pressure of the refrigerant and then changes the refrigerant into a low-temperature low-pressure refrigerant, the low-temperature low-pressure refrigerant enters the evaporator 74 to absorb heat in the air or the cooling liquid, the gas-liquid two-phase refrigerant flowing out from the evaporator 74 enters the first flow channel 201 of the gas-liquid separation device 100, the gas-liquid separation device 100 performs gas-liquid separation, the low-temperature low-pressure refrigerant in the interlayer cavity 122 exchanges heat with the high-temperature high-pressure refrigerant of the heat exchange tube 42, flows out from the second flow channel 202 to the compressor 71, and a heat exchange cycle is completed.

In the gas-liquid separation device 100, the liquid refrigerant is stored in the inner cylinder 11, the gaseous refrigerant exchanges heat with the heat exchange assembly 40, the temperature of the gaseous refrigerant after heat exchange is increased, the temperature of the refrigerant flowing in the heat exchange assembly 40 is decreased, and thus the temperature of the refrigerant entering the compressor 71 is increased, and the temperature of the refrigerant flowing into the throttling device 73 is decreased, so that the refrigeration effect of the evaporator 74 is improved.

When the thermal management system 70 is in the cooling mode, the evaporator 74 is located indoors (or within the passenger compartment) and the condenser 72 is located outdoors (or outside the passenger compartment). When the thermal management system 70 is in the heating mode, the condenser 72 is located indoors (or within the passenger compartment) and the evaporator 74 is located outdoors (or outside the passenger compartment). The thermal management system 70 may be used in a household or commercial air conditioning system, or in an automotive air conditioning system, or in a vehicle thermal management system that integrates an automotive air conditioning system with a battery coolant system.

The above embodiments are only for illustrating the present application and not for limiting the technical solutions described in the present application, and the present application should be understood by those skilled in the art based on the detailed description of the present application with reference to the above embodiments, but those skilled in the art should understand that the present application can be modified or substituted equally by those skilled in the art, and all technical solutions and modifications thereof without departing from the spirit and scope of the present application should be covered by the claims of the present application.

Claims

1. A gas-liquid separation apparatus, comprising: the gas-liquid separation device comprises a cylinder, an end cover and a sleeve, wherein the end cover is arranged at the end part of the cylinder in the length direction, the wall part of the end cover is in sealing connection with the wall part of the cylinder, the gas-liquid separation device is provided with a first cylinder cavity, and at least part of the sleeve is positioned in the first cylinder cavity;

the outer tube comprises a first region and a second region arranged along the length of the outer tube, the first region being 1/3 the maximum distance from the first bottom wall surface being the length of the outer tube, the second region being 1/3 the minimum distance from the first bottom wall surface, and the second region being 9/10 the maximum distance from the first bottom wall surface being the length of the outer tube;

the second oil return hole is arranged in a second area of the side wall.

2. The gas-liquid separation device according to claim 1, wherein: the second oil return hole comprises a first sub oil return hole, the minimum distance between the first sub oil return hole and the first bottom wall surface is L1, the length of the outer pipe is H, and L1/H is more than or equal to 0.4 and less than or equal to 0.5.

3. The gas-liquid separation device according to claim 2, wherein: the second oil return hole comprises a second sub oil return hole, the second sub oil return hole is positioned above the first sub oil return hole, the minimum distance between the second sub oil return hole and the first sub oil return hole is L2, and L2/H is more than or equal to 0.1 and less than or equal to 0.2.

4. The gas-liquid separation device according to claim 3, wherein: the second oil return hole comprises a third sub oil return hole, the third sub oil return hole is positioned above the second sub oil return hole, the minimum distance between the second sub oil return hole and the first sub oil return hole in the length direction of the outer pipe is L3, and L3/H is more than or equal to 0.1 and less than or equal to 0.2.

5. The gas-liquid separation device according to claim 4, wherein: the first sub oil return hole, the second sub oil return hole and the third sub oil return hole are all round holes, the hole sectional area of the second sub oil return hole is larger than that of the first sub oil return hole, and the hole sectional area of the third sub oil return hole is larger than that of the second sub oil return hole.

6. The gas-liquid separation device according to claim 5, wherein: the diameter size range of the hole section of the first sub oil return hole is 1.2-2.0 mm, the hole section area of the second sub oil return hole is 1.5-2.5 times of the hole section area of the first sub oil return hole, and the hole section area of the third sub oil return hole is 1.5-2.5 times of the hole section area of the second sub oil return hole.

7. The gas-liquid separation device according to claim 1, wherein: the barrel comprises an inner barrel and an outer barrel, the outer barrel is provided with a second barrel cavity, the inner barrel is provided with the first barrel cavity, the inner barrel is positioned in the second barrel cavity, and a sandwich cavity is formed between the outer wall of the inner barrel and the inner wall of the outer barrel;

the gas-liquid separation device further comprises a heat exchange assembly, the end cover comprises a third channel and a fourth channel, the heat exchange assembly is provided with a flow channel for flowing refrigerants, the flow channel is communicated with the third channel and the fourth channel, and the heat exchange assembly is provided with a heat exchange main body part positioned in the interlayer cavity;

the interlayer cavity is communicated with the third opening, and the interlayer cavity is communicated with the second channel.

8. The gas-liquid separation device according to claim 7, wherein: the end covers comprise a first end cover and a second end cover, the first end cover and the second end cover are welded on different sides of the length direction of the outer cylinder body, the first channel and the third channel are arranged on the first end cover, and the second channel and the fourth channel are arranged on the second end cover;

the inner barrel comprises a barrel body portion and a sealing cover, the bottom of the barrel body portion is close to the second end cover, the bottom of the sealing cover is close to the first end cover, a spacing cavity is formed between the sealing cover and the first end cover, the sealing cover is provided with a mounting hole, the second end portion of the inner pipe is at least partially located in the mounting hole, the third opening is communicated with the spacing cavity, and the spacing cavity is communicated with the interlayer cavity.

9. The gas-liquid separation device according to claim 8, wherein: the gas-liquid separation device also comprises a connecting pipe and an umbrella cap, wherein one end of the connecting pipe is connected with the first end cover, the other end of the connecting pipe is connected with the sealing cover, and the connecting pipe is provided with a connecting pipe cavity communicated with the first channel and the first cylinder cavity;

the umbrella cap at least part sets up in first barrel cavity, the umbrella cap includes disk body portion, extension and installation department, on perpendicular to connecting pipe length direction's plane, the orthographic projection of connecting the lumen falls into in the orthographic projection's of disk body portion region, the installation department install in the mounting hole, the installation department centre gripping in the second tip of inner tube with the closing cap is between the pore wall of mounting hole, the extension extends to the direction of keeping away from the installation department from disk body portion, just the clearance has between the inner wall of extension and interior barrel.

10. The gas-liquid separation device according to claim 7, wherein: the heat exchange assembly comprises a collecting pipe, a heat exchange pipe and fins, the collecting pipe is provided with a third pipe cavity and a fourth pipe cavity, the third pipe cavity is communicated with a third channel, the fourth pipe cavity is communicated with a fourth channel, the heat exchange pipe is provided with a plurality of micro-channel pipe cavities, and the plurality of micro-channel pipe cavities are communicated with the third pipe cavity and the fourth pipe cavity;

the fins are clamped between the heat exchange tube and the outer wall of the inner barrel, or between the heat exchange tube and the inner wall of the outer barrel.