Gas-liquid separation device and heat pump system

Abstract

The invention relates to a gas-liquid separation device and a heat pump system.The gas-liquid separation device comprises an inner barrel, an outer barrel, a cover, a separation rib set and a gas outlet pipeline part, the outer barrel is arranged on the peripheral side of the inner barrel in a sleeving mode, an interlayer cavity is formed between the inner barrel and the outer barrel, and the separation rib set is arranged in the interlayer cavity; the interlayer cavity is divided into a plurality of branch channels which are arranged in parallel, and the adjacent branch channels are sequentially communicated end to end to form a circuitous channel structure; the cover body synchronously covers the openings of the inner cylinder body and the outer cylinder body, the cover body is provided with a hot flow inlet and a cold flow inlet, and the hot flow inlet and the cold flow inlet are respectively communicated with the inlet end of the circuitous channel structure; one end of the air outlet pipeline part extends into and communicates with the separation cavity, and the other end of the air outlet pipeline part penetrates through the cover body in a sealed mode and communicates with the compressor. According to the gas-liquid separation device and the heat pump system, the problems that the operation efficiency of a heat pump is greatly reduced and oil return of a compressor is difficult due to the fact that the environment temperature is too low are solved.

Description

Technical Field

[0001] The present application relates to the technical field of gas-liquid separators, and in particular to a gas-liquid separation device and a heat pump system. Background Art

[0002] As the application of new energy electric vehicles becomes more and more common, the research on electric vehicle thermal management has received more and more attention. Electric vehicle thermal management mainly includes battery thermal management, passenger compartment air conditioning system and motor and electronic control thermal management.

[0003] Compared with traditional cars that use the engine's waste heat for heating, most pure electric car models use heat pumps combined with PTC for thermal management. PTC is used to heat the passenger compartment or battery pack at low temperatures. PTC has the advantages of fast heating speed and is not affected by ambient temperature. However, PTC has low heating efficiency and high energy consumption.

[0004] Correspondingly, the heating energy efficiency ratio of heat pumps is relatively high, but the operation of heat pumps is greatly restricted by the ambient temperature. Under low temperature conditions, due to the relatively low evaporation pressure of the refrigerant, the suction density of the compressor is reduced, and the quality and flow rate of the refrigerant are reduced at the same speed, and the heating capacity and heating efficiency of the entire heat pump will be greatly reduced. In addition, under low temperature conditions, the lubricating oil and refrigerant in the gas-liquid separator are prone to stratification due to the reduced solubility at low temperatures, and the viscosity of the lubricating oil increases as the temperature decreases, which will also make it difficult for the compressor to return oil.

[0005] Furthermore, in an ultra-low temperature working environment, the outdoor heat exchanger cannot absorb heat normally from the atmospheric environment, causing the heat pump to be unable to work normally. Summary of the invention

[0006] Based on this, it is necessary to provide a gas-liquid separation device and a heat pump system to solve the problem that the operating efficiency of the heat pump is greatly reduced due to the low ambient temperature and the oil return difficulty of the compressor.

[0007] The gas-liquid separation device provided in the present application includes an inner cylinder, an outer cylinder, a cover body, a dividing rib group and an air outlet pipe part. The outer cylinder is sleeved on the outer peripheral side of the inner cylinder, and an interlayer cavity is provided between the inner cylinder and the outer cylinder. The dividing rib group is provided in the interlayer cavity and divides the interlayer cavity into a plurality of branch channels arranged in parallel. Adjacent branch channels are connected end to end in sequence to form a detour channel structure. The cover body is synchronously covered at the openings of the inner cylinder and the outer cylinder. The cover body is provided with a hot flow inlet and a cold flow inlet, which are respectively connected to the inlet end of the detour channel structure. The inner cylinder is provided with a separation cavity connected to the outlet end of the detour channel structure. One end of the air outlet pipe part extends into and is connected to the separation cavity, and the other end is sealed and penetrated through the cover body and is connected to the compressor.

[0008] In one embodiment, the separation rib group includes a plurality of axial ribs extending axially along the gas-liquid separation device, and the plurality of axial ribs are arranged at intervals along the circumference of the interlayer cavity, wherein a portion of the axial ribs is provided with a top channel at one end close to the cover body, and a portion of the axial ribs is provided with a bottom channel at one end away from the cover body; adjacent axial ribs are arranged to form branch channels, and the top channels and the bottom channels are alternately arranged along the circumference of the interlayer cavity, so that adjacent branch channels are alternately connected through the top channels and the bottom channels to form a circuitous channel structure extending along the circumference of the interlayer cavity.

[0009] In one embodiment, the axial ribs are integrally formed with the inner cylinder, or the axial ribs are integrally formed with the outer cylinder, or the axial ribs are welded or bonded to the inner cylinder, or the axial ribs are welded or bonded to the outer cylinder.

[0010] In one embodiment, the separation rib group includes a plurality of circumferential ribs extending along the circumference of the gas-liquid separation device and a first rib and a second rib extending along the axial direction of the gas-liquid separation device, the first rib and the second rib are arranged at intervals along the circumference of the interlayer cavity to form an axial channel; the area of ​​the interlayer cavity outside the axial channel is defined as a mixed flow area, the circumferential ribs are arranged in the mixed flow area, and a plurality of circumferential ribs are arranged at intervals along the axial direction of the gas-liquid separation device, wherein one end of a portion of the circumferential ribs is sealed connected to the first rib, and the other end is arranged at intervals with the second rib to form a second channel, and one end of another portion of the circumferential ribs is sealed connected to the second rib, and the other end is arranged at intervals with the first rib to form a first channel; adjacent circumferential ribs are arranged to form branch channels, and the circumferential ribs and the bottom wall of the interlayer cavity are arranged to form branch channels, the first channel and the second channel are alternately arranged along the axial direction of the interlayer cavity, so that adjacent branch channels are alternately connected through the first channel and the second channel to form a circuitous channel structure extending along the axial direction of the interlayer cavity; the axial channel connects the branch channel located at the bottom of the interlayer cavity.

[0011] In one embodiment, the circumferential ribs are integrally formed with the inner cylinder, or the circumferential ribs are integrally formed with the outer cylinder, or the circumferential ribs are welded or bonded to the inner cylinder, or the circumferential ribs are welded or bonded to the outer cylinder.

[0012] In one embodiment, the cover body includes a first cover, a second cover and a partition plate group, the first cover is sealed at the opening of the outer cylinder, the second cover is sealed at the opening of the inner cylinder, the first cover and the second cover are spaced along the axial direction of the gas-liquid separation device to form a spacing area; the two ends of the partition plate group are respectively connected to the first cover and the second cover to separate the spacing area into an inlet chamber and an outlet chamber, the hot flow inlet and the cold flow inlet are respectively arranged on the first cover, the hot flow inlet and the cold flow inlet are respectively connected to the inlet end of the detour channel structure through the inlet chamber, the second cover is provided with a through hole connected to the separation chamber, and the outlet end of the detour channel structure is connected to the separation chamber through the outlet chamber and the through hole in turn.

[0013] In one embodiment, the air outlet pipe portion includes a tube body and a channel portion. The channel portion is arranged on the cover body and is sequentially passed through the first cover and the second cover along the axial direction of the gas-liquid separation device. One end of the tube body is inserted into the channel portion, and the other end extends toward the bottom of the separation chamber.

[0014] In one of the embodiments, the gas-liquid separation device also includes a separation hood arranged in the separation chamber, the separation hood is fixedly sleeved on one end of the tube body close to the cover body, and the opening of the separation hood faces away from the cover body, so that the mixed refrigerant entering the separation chamber from the through hole can impact the end surface of the separation hood away from its own opening.

[0015] In one embodiment, the gas-liquid separation device also includes a separation cylinder, which is arranged on the side of the separation cover away from the cover body and fixedly sleeved on the outer peripheral side of the tube body, the inner diameter of the separation cover is larger than the inner diameter of the separation cylinder, the separation cover is arranged at the opening of the separation cylinder and connected to the separation cylinder, and the end of the tube body away from the cover body is connected to the separation cylinder.

[0016] In one embodiment, the gas-liquid separation device further comprises a filter portion, which is disposed at one end of the tube body away from the cover body so that the tube body can be connected to the bottom end of the separation chamber through the filter portion, and the filter portion and the bottom wall of the separation chamber are spaced apart.

[0017] The present application also provides a heat pump system, which includes the gas-liquid separation device described in any one of the above embodiments.

[0018] Compared with the prior art, the gas-liquid separation device and heat pump system provided by the present application, by setting a circuitous channel structure between the inner cylinder and the outer cylinder, on the one hand, can make the high-temperature refrigerant and the low-temperature refrigerant fully mixed in the circuitous channel structure, so that the high-temperature refrigerant can heat the low-temperature refrigerant to increase the evaporation pressure of the low-temperature refrigerant, and increase the suction density of the compressor, so that at the same speed, the flow rate of the mixed refrigerant absorbed by the compressor increases, thereby significantly improving the heating amount and heating efficiency of the entire heat pump system. Moreover, such a setting can make the liquid refrigerant in the low-temperature refrigerant absorb a large amount of heat and vaporize, avoiding the compressor from being affected by liquid hammer.

[0019] On the other hand, since the detour channel structure is arranged on the outside of the separation chamber, the mixed refrigerant in the detour channel structure can heat the oil at the bottom of the separation chamber to increase the temperature of the oil and reduce the viscosity, thereby improving the miscibility of the oil and the mixed refrigerant, which is beneficial to the oil return of the compressor.

[0020] Furthermore, the low-temperature refrigerant and the high-temperature refrigerant are fully mixed in the detour channel structure, which can effectively reduce the temperature and flow rate of the high-temperature refrigerant before it enters the compressor, and effectively increase the temperature and flow rate of the low-temperature refrigerant before it enters the compressor, thereby making the temperature and flow rate of the high-temperature refrigerant and the low-temperature refrigerant tend to be balanced.

[0021] Furthermore, compared with the prior art method of heating the low-temperature refrigerant inside the gas-liquid separator by winding a tube, the gas-liquid separation device in the present application can significantly reduce the volume of the gas-liquid separation device and reduce the difficulty of assembling the gas-liquid separation device.

[0022] In summary, the gas-liquid separation device provided in the present application can not only solve the problem of a significant decrease in the operating efficiency of the heat pump and difficulty in oil return of the compressor caused by the low ambient temperature, but also make the temperature and flow rate of the high-temperature refrigerant and the low-temperature refrigerant tend to be balanced, and greatly reduce the volume and assembly difficulty of the gas-liquid separation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic diagram of the structure of a gas-liquid separation device according to an embodiment of the present application;

[0025] Figure 2 An exploded view of the gas-liquid separation device of Example 1 provided in the present application;

[0026] Figure 3 A cross-sectional view of the gas-liquid separation device of Example 1 provided in the present application;

[0027] Figure 4 Schematic diagram of the partial structure of the gas-liquid separation device of Example 1 provided in this application Figure 1 ;

[0028] Figure 5 Schematic diagram of the partial structure of the gas-liquid separation device of Example 1 provided in this application Figure 2 ;

[0029] Figure 6 A cross-sectional view of a gas-liquid separation device according to Embodiment 2 provided in the present application;

[0030] Figure 7 Schematic diagram of the partial structure of the gas-liquid separation device of Example 2 provided in this application Figure 1 ;

[0031] Figure 8 Schematic diagram of the partial structure of the gas-liquid separation device of Example 2 provided in this application Figure 2 ;

[0032] Fig. 9 Schematic diagram of the partial structure of the gas-liquid separation device of Example 2 provided in this application Figure 3 .

[0033] Reference numerals: 100, inner cylinder; 110, separation chamber; 200, outer cylinder; 210, interlayer chamber; 211, branch channel; 212, circuitous channel structure; 300, cover; 310, first cover; 311, hot flow inlet; 312, cold flow inlet; 320, second cover; 321, through hole; 330, partition plate group; 331, inlet chamber; 332, outlet chamber; 400, separation rib group ; 410, axial ribs; 411, top channel; 412, bottom channel; 420, circumferential ribs; 421, first channel; 422, second channel; 430, first ribs; 440, second ribs; 450, axial channel; 460, sealing plate; 500, air outlet pipe part; 510, tube body; 520, channel part; 600, separation cover; 700, separation cylinder; 800, filter part. DETAILED DESCRIPTION

[0034] As the application of new energy electric vehicles becomes more and more common, the research on electric vehicle thermal management has received more and more attention. Electric vehicle thermal management mainly includes battery thermal management, passenger compartment air conditioning system and motor and electronic control thermal management.

[0035] Compared with traditional cars that use the engine's waste heat for heating, most pure electric car models use heat pumps combined with PTC for thermal management. PTC is used to heat the passenger compartment or battery pack at low temperatures. PTC has the advantages of fast heating speed and is not affected by ambient temperature. However, PTC has low heating efficiency and high energy consumption.

[0036] Correspondingly, the heating energy efficiency ratio of heat pumps is relatively high, but the operation of heat pumps is greatly restricted by the ambient temperature. Under low temperature conditions, due to the relatively low evaporation pressure of the refrigerant, the suction density of the compressor is reduced, and the quality and flow rate of the refrigerant are reduced at the same speed, and the heating capacity and heating efficiency of the entire heat pump will be greatly reduced. In addition, under low temperature conditions, the lubricating oil and refrigerant in the gas-liquid separator are prone to stratification due to the reduced solubility at low temperatures, and the viscosity of the lubricating oil increases as the temperature decreases, which will also make it difficult for the compressor to return oil.

[0037] Furthermore, in an ultra-low temperature working environment, the outdoor heat exchanger cannot absorb heat normally from the atmospheric environment, causing the heat pump to be unable to work normally.

[0038] In order to solve the problem that the operating efficiency of the heat pump is greatly reduced due to the low ambient temperature and the oil return difficulty of the compressor, the present application provides a gas-liquid separation device and a heat pump system.

[0039] See also Figure 1-Figure 9 The gas-liquid separation device includes an inner cylinder 100, an outer cylinder 200, a cover body 300, a partition rib group 400 and an air outlet pipe part 500. The outer cylinder 200 is sleeved on the outer peripheral side of the inner cylinder 100, and an interlayer cavity 210 is provided between the inner cylinder 100 and the outer cylinder 200. The partition rib group 400 is provided in the interlayer cavity 210 and divides the interlayer cavity 210 into a plurality of branch channels 211 arranged in parallel. Adjacent branch channels 211 are connected in sequence end to end to form a serpentine detour channel structure 212.

[0040] The opening of the inner cylinder 100 and the opening of the outer cylinder 200 face the same side, and the cover body 300 is synchronously covered on the openings of the inner cylinder 100 and the outer cylinder 200, and the cover body 300 is provided with a hot flow inlet 311 and a cold flow inlet 312, and the hot flow inlet 311 and the cold flow inlet 312 are respectively connected to the inlet end of the detour channel structure 212, and the high-temperature refrigerant enters the inlet end of the detour channel structure 212 through the hot flow inlet 311, and the low-temperature refrigerant enters the inlet end of the detour channel structure 212 through the cold flow inlet 312, and the high-temperature refrigerant and the low-temperature refrigerant mix in the detour channel structure 212.

[0041] It should be noted that the gas-liquid separation device provided in the present application can be used normally and efficiently under the following three working conditions (conventional refrigeration, heating conditions above -10°C, and ultra-low temperature heating conditions below -10°C), specifically:

[0042] Under normal cooling and heating conditions above -10°C, the low-temperature refrigerant does not need to be heated before entering the compressor. The low-temperature refrigerant enters the detour channel structure 212 from the evaporator and the outdoor heat exchanger (evaporation heat absorption) through the cold flow inlet 312 and enters the separation chamber 110, and finally leaves the separation chamber 110 through the outlet pipe part 500 and enters the compressor to ensure the normal operation and oil return of the compressor.

[0043] Under ultra-low temperature heating conditions below -10°C, the refrigerant at the compressor outlet is divided into two parts. One part of the high-temperature refrigerant enters the indoor condenser to release heat to the passenger compartment, and flows into the cold flow inlet 312 through throttling and pressure reduction. The other part of the high-temperature refrigerant directly enters the hot flow inlet 311 through throttling and pressure reduction of the bypass expansion valve.

[0044] The inner cylinder 100 is provided with a separation chamber 110 connected to the outlet end of the detour channel structure 212. One end of the air outlet pipe portion 500 extends into and is connected to the separation chamber 110, and the other end is sealed and penetrated through the cover body 300 and is connected to the compressor (not shown) so that the mixed high-temperature refrigerant and low-temperature refrigerant can enter the compressor through the separation chamber 110 and the air outlet pipe portion 500.

[0045] By setting the detour channel structure 212 between the inner cylinder 100 and the outer cylinder 200, on the one hand, the high-temperature refrigerant and the low-temperature refrigerant can be fully mixed in the detour channel structure 212, so that the high-temperature refrigerant can heat the low-temperature refrigerant to increase the evaporation pressure of the low-temperature refrigerant and increase the suction density of the compressor, so that at the same speed, the flow rate of the mixed refrigerant absorbed by the compressor increases, thereby significantly improving the heating amount and heating efficiency of the entire heat pump system. In addition, such a setting can make the liquid refrigerant in the low-temperature refrigerant absorb a large amount of heat and vaporize, avoiding the compressor from being affected by liquid hammer.

[0046] On the other hand, since the detour channel structure 212 is arranged on the outside of the separation chamber 110, the mixed refrigerant in the detour channel structure 212 can heat the oil at the bottom of the separation chamber 110 to increase the temperature of the oil and reduce the viscosity, thereby improving the miscibility of the oil and the mixed refrigerant, which is beneficial to the oil return of the compressor.

[0047] Furthermore, the low-temperature refrigerant and the high-temperature refrigerant are fully mixed in the detour channel structure 212, which can effectively reduce the temperature and flow rate of the high-temperature refrigerant before it enters the compressor, and effectively increase the temperature and flow rate of the low-temperature refrigerant before it enters the compressor, thereby making the temperature and flow rate of the high-temperature refrigerant and the low-temperature refrigerant tend to be balanced.

[0048] Furthermore, compared with the prior art method of heating the low-temperature refrigerant inside the gas-liquid separator by winding a tube, the gas-liquid separation device in the present application can significantly reduce the volume of the gas-liquid separation device and reduce the difficulty of assembling the gas-liquid separation device.

[0049] In summary, the gas-liquid separation device provided in the present application can not only solve the problem of a significant decrease in the operating efficiency of the heat pump and difficulty in oil return of the compressor caused by the low ambient temperature, but also make the temperature and flow rate of the high-temperature refrigerant and the low-temperature refrigerant tend to be balanced, and greatly reduce the volume and assembly difficulty of the gas-liquid separation device.

[0050] In one embodiment, if Figure 2 , Figure 3 , Figure 6 , Figure 7 and Figure 8As shown, the cover body 300 includes a first cover 310, a second cover 320 and a partition plate group 330. The first cover 310 is sealed at the opening of the outer cylinder 200, and the second cover 320 is sealed at the opening of the inner cylinder 100. The first cover 310 and the second cover 320 are spaced apart along the axial direction of the gas-liquid separation device to form a spacing area.

[0051] Specifically, the axial length of the outer cylinder 200 is greater than the axial length of the inner cylinder 100 , that is, the inner cylinder 100 is completely disposed inside the outer cylinder 200 .

[0052] The two ends of the partition plate group 330 are respectively connected to the first cover 310 and the second cover 320 to separate the interval area into an inlet chamber 331 and an outlet chamber 332. The hot flow inlet 311 and the cold flow inlet 312 are respectively arranged on the first cover 310, and the hot flow inlet 311 and the cold flow inlet 312 are respectively connected to the inlet end of the detour channel structure 212 through the inlet chamber 331. The second cover 320 is provided with a through hole 321 connected to the separation chamber 110, and the outlet end of the detour channel structure 212 is connected to the separation chamber 110 through the outlet chamber 332 and the through hole 321 in turn.

[0053] Such arrangement can avoid mixing of the refrigerant at the inlet end and the refrigerant at the outlet end of the circuitous channel structure 212, thereby preventing the refrigerant at the outlet end from mixing into the liquid component in the refrigerant at the inlet end. In addition, the overall temperature of the mixed refrigerant at the inlet end is relatively high, and the mixed refrigerant at the outlet end can also be reheated.

[0054] In one embodiment, if Figure 2 , Figure 3 and Figure 6 As shown, the air outlet pipe portion 500 includes a tube body 510 and a channel portion 520. The channel portion 520 is arranged on the cover body 300 and is sequentially passed through the first cover 310 and the second cover 320 along the axial direction of the gas-liquid separation device. One end of the tube body 510 is inserted into the channel portion 520 and extends toward the bottom of the separation chamber 110 (one end away from the cover body 300).

[0055] Specifically, the channel portion 520 and the cover body 300 are integrally formed.

[0056] Such an arrangement is beneficial to increasing the assembly strength of the air outlet pipe and the cover body 300 .

[0057] In one embodiment, if Figure 2 , Figure 3 and Figure 6As shown, the gas-liquid separation device also includes a separation hood 600 arranged in the separation chamber 110, and the separation hood 600 is fixedly mounted on one end of the tube body 510 close to the cover body 300, and the opening of the separation hood 600 faces away from the cover body 300, so that the mixed refrigerant entering the separation chamber 110 from the through hole 321 can impact the end surface of the separation hood 600 away from its own opening.

[0058] The refrigerant in the form of gas-liquid mixture can first impact the back side of the separation cover 600 (the end face away from its opening), and then the liquid refrigerant adheres to the separation cover 600 and flows into the bottom of the separation chamber 110 along the edge of the separation cover 600. The gaseous refrigerant bypasses the outer wall of the separation cover 600 and enters the interior of the separation cover 600 through the opening of the separation cover 600. Such a setting greatly improves the effect of gas-liquid separation and further avoids liquid hammer in the compressor.

[0059] Further, in one embodiment, if Figure 2 , Figure 3 and Figure 6 As shown, the gas-liquid separation device also includes a separation cylinder 700, which is arranged on the side of the separation cover 600 away from the cover body 300 and is fixedly sleeved on the outer peripheral side of the tube body 510. The inner diameter of the separation cover 600 is larger than the inner diameter of the separation cylinder 700. The separation cover 600 is arranged at the opening of the separation cylinder 700 and is connected to the separation cylinder 700. The end of the tube body 510 away from the cover body 300 is connected to the separation cylinder 700.

[0060] In this way, if the gaseous refrigerant wants to enter the air outlet pipe part 500, it must first pass through the separation hood 600 to enter the separation cylinder 700. Since the opening of the separation cylinder 700 is connected to the separation hood 600, and the separation hood 600 is arranged at one end of the tube body 510 close to the cover body 300, that is, the separation hood 600 is located at the top of the separation chamber 110, the liquid refrigerant at the bottom of the separation chamber 110 cannot enter the air outlet pipe part 500 through the separation cylinder 700, thereby effectively avoiding the occurrence of compressor liquid hammer.

[0061] In one embodiment, if Figure 2 , Figure 3 and Figure 6 As shown, the gas-liquid separation device also includes a filter part 800, which is arranged at the end of the tube body 510 away from the cover body 300, so that the tube body 510 can be connected to the bottom end of the separation chamber 110 (the end away from the cover body 300) through the filter part 800, and the filter part 800 and the bottom wall of the separation chamber 110 are spaced apart.

[0062] With such arrangement, the oil in the refrigerant can be separated by the filter unit 800 and the flow rate of the refrigerant can be reduced to prevent the liquid refrigerant and the oil at the bottom of the separation chamber 110 from boiling due to excessive refrigerant flow.

[0063] Specifically, ear structures (not shown) are provided at both ends of the filter unit 800, and the filter unit 800 is connected to the tube body 510 through the ear structures.

[0064] Embodiment 1

[0065] In one embodiment, if Figure 2-Figure 5 As shown, the separation rib group 400 includes a plurality of axial ribs 410 extending axially along the gas-liquid separation device, and the plurality of axial ribs 410 are arranged at circumferential intervals along the interlayer cavity 210, wherein a portion of the axial ribs 410 is provided with a top channel 411 at one end close to the cover body 300, and a portion of the axial ribs 410 is provided with a bottom channel 412 at one end away from the cover body 300.

[0066] Specifically, adjacent axial ribs 410 are arranged in a staggered manner along the axial direction of the gas-liquid separation device to form a top channel 411 and a bottom channel 412 respectively.

[0067] Adjacent axial ribs 410 are arranged to form branch channels 211, and top channels 411 and bottom channels 412 are alternately arranged along the circumference of the interlayer cavity 210, so that adjacent branch channels 211 are alternately connected through the top channels 411 and the bottom channels 412 to form a wavy and circuitous channel structure 212 extending along the circumference of the interlayer cavity 210.

[0068] For example, when the number of branch channels 211 is four, the total stroke of the detour channel structure 212 is greater than four times the axial length of the interlayer chamber 210 along the gas-liquid separation device. In this way, the flow distance of the refrigerant before entering the separation chamber 110 is greatly increased, which is beneficial to the full mixing of high-temperature refrigerant and low-temperature refrigerant in the detour channel structure 212, and can ensure that the outer peripheral side of the separation chamber 110 is in a constant temperature state.

[0069] Specifically, in one embodiment, the axial ribs 410 can be integrally formed with the inner cylinder 100, or the axial ribs 410 can be integrally formed with the outer cylinder 200, or the axial ribs 410 are welded or bonded to the inner cylinder 100 or the outer cylinder 200, respectively.

[0070] Furthermore, in one embodiment, the partition plate group 330 also divides the spacing area into one or more transition cavities, and adjacent axial ribs 410 are connected through the transition cavities. At this time, the function of the transition cavity is equivalent to the top channel 411.

[0071] This is beneficial for expanding the flow area of ​​the top channel 411.

[0072] Embodiment 2

[0073] In one embodiment, if Figure 6-Figure 9As shown, the separation rib group 400 includes a plurality of circumferential ribs 420 extending circumferentially along the gas-liquid separation device and a first rib 430 and a second rib 440 extending axially along the gas-liquid separation device. The first rib 430 and the second rib 440 are arranged at circumferential intervals along the interlayer cavity 210 to form an axial channel 450.

[0074] The area of ​​the interlayer cavity 210 outside the axial channel 450 is defined as the mixed flow area, and the circumferential ribs 420 are arranged in the mixed flow area, and a plurality of circumferential ribs 420 are arranged at intervals along the axial direction of the gas-liquid separation device. One end of a portion of the circumferential ribs 420 is sealed and connected to the first rib 430, and the other end is spaced apart from the second rib 440 to form a second channel 422, and one end of another portion of the circumferential ribs 420 is sealed and connected to the second rib 440, and the other end is spaced apart from the first rib 430 to form a first channel 421.

[0075] Adjacent circumferential ribs 420 are arranged to form branch channels 211, and the circumferential ribs 420 and the bottom wall of the interlayer cavity 210 are arranged to form branch channels 211. The first channel 421 and the second channel 422 are alternately arranged along the axial direction of the interlayer cavity 210, so that adjacent branch channels 211 are alternately connected through the first channel 421 and the second channel 422 to form a wavy tortuous channel structure 212 extending axially along the interlayer cavity 210.

[0076] In addition, the axial channel 450 is connected to the branch channel 211 located at the bottom of the interlayer cavity 210 (away from the end of the cover body 300 ). Specifically, the second rib 440 and the bottom wall of the interlayer cavity 210 are spaced apart so that the axial channel 450 is connected to the branch channel 211 through one side of the second rib 440 .

[0077] It should be noted that one end of the axial channel 450 is connected to the branch channel 211 at the bottom of the interlayer cavity 210 , and the other end is connected to the inlet cavity 331 , and the branch channel 211 located at the top of the interlayer cavity 210 is connected to the outlet cavity 332 .

[0078] Specifically, in one embodiment, the circumferential ribs 420 can be integrally formed with the inner cylinder 100, or the circumferential ribs 420 can be integrally formed with the outer cylinder 200, or the circumferential ribs 420 are welded or bonded to the inner cylinder 100 or the outer cylinder 200, respectively.

[0079] In this embodiment, the mixed refrigerant first enters the axial channel 450 through the inlet chamber 331, then enters the branch channel 211 of the bottom layer through the axial channel 450, and then enters the branch channel 211 of the upper layer through the first channel 421, and so on, until entering the branch channel 211 of the top layer, and then the mixed refrigerant enters the separation chamber 110 through the outlet chamber 332.

[0080] In this way, the refrigerant in the branch channel 211 at the bottom of the interlayer cavity 210 is mixed first, and then the refrigerant flows upward along the axial direction of the interlayer cavity 210. Since the overall temperature of the refrigerant in the branch channel 211 where mixing occurs first is the highest, such a setting can ensure that the refrigerant and oil at the bottom of the separation cavity 110 maintain a relatively high temperature, which is beneficial to the vaporization of the refrigerant and the reflux of the oil.

[0081] It should be noted that a sealing plate 460 disposed opposite to the first rib 430 is provided at one end of the topmost first channel 421 away from the first rib 430 to ensure that the refrigerant enters the outlet cavity 332 through the first channel 421 .

[0082] The present application also provides a heat pump system, which includes the gas-liquid separation device described in any one of the above embodiments.

[0083] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0084] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

[0085] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0086] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0087] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0088] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0089] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0090] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

Claims

1. A gas-liquid separation device, characterized in that: The invention comprises an inner cylinder (100), an outer cylinder (200), a cover (300), a separation rib group (400) and an air outlet pipe portion (500), wherein the outer cylinder (200) is sleeved on the outer peripheral side of the inner cylinder (100), an interlayer cavity (210) is provided between the inner cylinder (100) and the outer cylinder (200), and the separation rib group (400) is provided in the interlayer cavity (210) and divides the interlayer cavity (210) into a plurality of branch channels (211) arranged in parallel, and adjacent branch channels (211) are connected end to end in sequence to form a circuitous channel structure (212); The cover body (300) is synchronously covered at the openings of the inner cylinder (100) and the outer cylinder (200), and the cover body (300) is provided with a hot flow inlet (311) and a cold flow inlet (312), and the hot flow inlet (311) and the cold flow inlet (312) are respectively connected to the inlet ends of the detour channel structure (212); The inner cylinder (100) is provided with a separation chamber (110) connected to the outlet end of the detour channel structure (212); one end of the air outlet pipe portion (500) extends into and is connected to the separation chamber (110), and the other end is sealed and penetrates the cover body (300) and is connected to the compressor.

2. The gas-liquid separation device according to claim 1, characterized in that: The separation rib group (400) comprises a plurality of axial ribs (410) extending axially along the gas-liquid separation device, the plurality of axial ribs (410) being arranged at intervals along the circumference of the interlayer cavity (210), wherein a portion of the axial ribs (410) is provided with a top channel (411) at one end close to the cover body (300), and a portion of the axial ribs (410) is provided with a bottom channel (412) at one end away from the cover body (300); The adjacent axial ribs (410) are arranged around the branch channels (211), and the top channels (411) and the bottom channels (412) are alternately arranged along the circumference of the interlayer cavity (210), so that the adjacent branch channels (211) are alternately connected through the top channels (411) and the bottom channels (412) to form the circuitous channel structure (212) extending along the circumference of the interlayer cavity (210).

3. The gas-liquid separation device according to claim 2, characterized in that: The axial rib (410) and the inner cylinder (100) are integrally formed, or the axial rib (410) and the outer cylinder (200) are integrally formed, or the axial rib (410) is welded or bonded to the inner cylinder (100), or the axial rib (410) is welded or bonded to the outer cylinder (200).

4. The gas-liquid separation device according to claim 1, characterized in that: The separation rib group (400) comprises a plurality of circumferential ribs (420) extending along the circumference of the gas-liquid separation device, and a first rib (430) and a second rib (440) extending along the axial direction of the gas-liquid separation device, wherein the first rib (430) and the second rib (440) are arranged at intervals along the circumference of the interlayer cavity (210) to form an axial channel (450); The region where the interlayer cavity (210) is located outside the axial channel (450) is defined as a mixed flow region, the circumferential ribs (420) are arranged in the mixed flow region, and a plurality of the circumferential ribs (420) are arranged at intervals along the axial direction of the gas-liquid separation device, wherein one end of a portion of the circumferential ribs (420) is sealedly connected to the first rib (430), and the other end is spaced apart from the second rib (440) to form a second channel (422), and one end of another portion of the circumferential ribs (420) is sealedly connected to the second rib (440), and the other end is spaced apart from the first rib (430) to form a first channel (421); Adjacent circumferential ribs (420) are arranged to form the branch channel (211), and the circumferential ribs (420) and the bottom wall of the interlayer cavity (210) are arranged to form the branch channel (211), and the first channel (421) and the second channel (422) are alternately arranged along the axial direction of the interlayer cavity (210), so that adjacent branch channels (211) are alternately connected through the first channel (421) and the second channel (422) to form the circuitous channel structure (212) extending along the axial direction of the interlayer cavity (210); The axial channel (450) is connected to the branch channel (211) located at the bottom of the interlayer cavity (210).

5. The gas-liquid separation device according to claim 4, characterized in that: The circumferential rib (420) and the inner cylinder (100) are integrally formed, or the circumferential rib (420) and the outer cylinder (200) are integrally formed, or the circumferential rib (420) is welded or bonded to the inner cylinder (100), or the circumferential rib (420) is welded or bonded to the outer cylinder (200).

6. The gas-liquid separation device according to claim 1, characterized in that: The cover body (300) comprises a first cover (310), a second cover (320) and a partition plate group (330), wherein the first cover (310) is sealed at the opening of the outer cylinder (200), and the second cover (320) is sealed at the opening of the inner cylinder (100), and the first cover (310) and the second cover (320) are spaced apart along the axial direction of the gas-liquid separation device to form a spacer area; The two ends of the partition plate group (330) are respectively connected to the first cover (310) and the second cover (320) to separate the interval area into an inlet chamber (331) and an outlet chamber (332); the hot flow inlet (311) and the cold flow inlet (312) are respectively arranged on the first cover (310); the hot flow inlet (311) and the cold flow inlet (312) are respectively connected to the inlet end of the detour channel structure (212) through the inlet chamber (331); the second cover (320) is provided with a through hole (321) connected to the separation chamber (110); the outlet end of the detour channel structure (212) is connected to the separation chamber (110) through the outlet chamber (332) and the through hole (321) in sequence.

7. The gas-liquid separation device according to claim 6, characterized in that: The gas outlet pipe portion (500) comprises a tube body (510) and a channel portion (520); the channel portion (520) is arranged on the cover body (300) and is sequentially passed through the first cover (310) and the second cover (320) along the axial direction of the gas-liquid separation device; one end of the tube body (510) is inserted into the channel portion (520), and the other end extends toward the bottom of the separation chamber (110).

8. The gas-liquid separation device according to claim 7, characterized in that: It also includes a separation cover (600) arranged in the separation chamber (110), and the separation cover (600) is fixedly sleeved on one end of the tube body (510) close to the cover body (300), and the opening of the separation cover (600) faces away from the cover body (300) so that the mixed refrigerant entering the separation chamber (110) from the through hole (321) can impact the end face of the separation cover (600) away from its own opening.

9. The gas-liquid separation device according to claim 8, characterized in that: The invention also includes a separation cylinder (700), wherein the separation cylinder (700) is arranged on a side of the separation cover (600) away from the cover body (300) and is fixedly sleeved on the outer peripheral side of the tube body (510), the inner diameter of the separation cover (600) is larger than the inner diameter of the separation cylinder (700), the separation cover (600) is arranged at the opening of the separation cylinder (700) and is connected to the separation cylinder (700), and the end of the tube body (510) away from the cover body (300) is connected to the separation cylinder (700).

10. The gas-liquid separation device according to claim 7, characterized in that: It also includes a filter portion (800), which is arranged at one end of the tube body (510) away from the cover body (300) so that the tube body (510) can be connected to the bottom end of the separation chamber (110) through the filter portion (800), and the filter portion (800) and the bottom wall of the separation chamber (110) are arranged at intervals.

11. A heat pump system, characterized in that: It comprises a gas-liquid separation device as described in any one of claims 1 to 10.

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