A high-efficiency oil return gas-liquid separator with a cavity center heat exchange

Abstract

This invention relates to a high-efficiency oil-liquid separator with internal cavity central heat exchange, belonging to the technical field of gas-liquid separators. It includes a cylinder, a cap, an elastic liquid-blocking cap, a pipeline cap, a pipeline assembly, an intermediate heat exchanger assembly, a large filter screen, and an oil return hole filter screen. The pipeline assembly is internally divided into an air inlet chamber, a gas-liquid separation chamber, and an internal heat exchange chamber by axially arranged pipe walls. An oil return hole is provided on the lower part of the outer wall corresponding to the air inlet chamber. The internal heat exchange chamber is located at the central axis of the cylinder, and its exterior consists of the gas-liquid separation chamber and the air inlet chamber, arranged from the inside out. This invention employs internal cavity heat exchange. Because the internal heat exchange chamber is far from the cylinder wall, it is less affected by external temperature. The intermediate heat exchanger assembly uses a microchannel fin structure for better heat dissipation. The elastic liquid-blocking cap collects liquid and ensures uniform liquid distribution through its liquid-distributing ribs, ensuring complete liquid vaporization.

Description

Technical Field

[0001] This invention belongs to the field of gas-liquid separator technology, and in particular relates to a high-efficiency oil return gas-liquid separator with central heat exchange in the inner cavity. Background Technology

[0002] Carbon dioxide, as an air conditioning medium, has the characteristic that its energy efficiency increases at lower temperatures during cooling. However, above 35°C, its energy efficiency ratio is lower than that of refrigerant R134A. Currently, carbon dioxide gas-liquid separators use an inner cavity for liquid storage and an outer cavity for heat exchange. Because the cylinder absorbs heat from the outside, it significantly impacts heat exchange. During cooling, the ambient temperature makes it difficult to lower the refrigerant temperature below 35°C, resulting in extremely low heat exchange efficiency and poor oil return. Furthermore, the current carbon dioxide gas-liquid separators have an unreasonable layout, with inconsistent channel sizes increasing flow resistance. Additionally, the external cavity heat exchange uses a spiral tube design, which is heavy and has a small heat exchange area, making it unsuitable for modern automotive air conditioning applications.

[0003] Therefore, there is an urgent need for a new technical solution to address this problem in the existing technology. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a high-efficiency oil-liquid gas-liquid separator with internal cavity center heat exchange to solve the technical problems of existing carbon dioxide gas-liquid separators, which all adopt the method of internal cavity liquid storage and external cavity heat exchange, resulting in large flow resistance, small heat exchange area and large weight.

[0005] A high-efficiency oil-gas-liquid separator with internal cavity central heat exchange includes a cylinder, a cover, an elastic liquid-blocking cover, a pipeline cover, a pipeline assembly, an intermediate heat exchanger assembly, a large filter screen, and an oil return hole filter screen.

[0006] The cylinder and the cover are fixedly connected to form the cavity of the gas-liquid separator. The upper part of the cavity is provided with a low-pressure inlet and a high-pressure outlet, and the lower part of the cavity is provided with a low-pressure outlet and a high-pressure inlet. The outer periphery of the elastic liquid-blocking cover is evenly provided with elastic pieces, and the elastic liquid-blocking cover is located at the inner top of the cavity and the elastic pieces abut against the inner top of the cavity.

[0007] The upper part of the pipe cover is fixedly connected to the elastic liquid-blocking cover and receives the liquid flowing down from the elastic liquid-blocking cover. The lower part of the pipe cover is fixedly connected to the pipe assembly. The upper part of the pipe cover is provided with an oil return groove. The oil return groove is a hollow narrow groove that connects the upper part of the pipe cover with the internal heat exchange chamber of the pipe assembly.

[0008] The lower part of the pipeline assembly is fixedly connected to the large filter screen, and the lower edge of the pipeline assembly is snapped into the cover. A gap is left between the pipeline assembly and the inner wall of the cylinder. The interior of the pipeline assembly is divided into an air inlet chamber, a gas-liquid separation chamber, and an internal heat exchange chamber by pipe walls arranged along the axial direction. An oil return hole 504 is provided on the lower part of the outer wall of the pipeline assembly corresponding to the air inlet chamber. The internal heat exchange chamber is located at the central axis of the cylinder. The outer part of the internal heat exchange chamber consists of a gas-liquid separation chamber and an air inlet chamber from the inside out. The upper part of the air inlet chamber communicates with the inner cavity of the cylinder, and the lower part of the air inlet chamber communicates with the gas-liquid separation chamber. The lower part of the separation chamber is connected; the upper part of the gas-liquid separation chamber is connected to the inner heat exchange chamber; the intermediate heat exchanger assembly is fixedly installed in the inner heat exchange chamber and has a gap with the side wall of the inner heat exchange chamber; the upper pipeline of the intermediate heat exchanger assembly passes through the pipeline cover and the elastic liquid-blocking cover in sequence and is connected to the high-pressure outlet; the lower pipeline of the intermediate heat exchanger assembly passes through the large filter screen and is fixedly connected to the high-pressure inlet; the oil return hole filter screen is set outside the oil return hole 504; the low-pressure inlet is connected to the interior of the cavity; the low-pressure outlet is connected to the lower part of the inner heat exchange chamber.

[0009] The intermediate heat exchanger assembly includes a high-pressure inlet pipe, a flow divider plate, a collector pipe II, microchannels, fins, a heat dissipation shield, double-row connecting pipes, a plug plate, a collector pipe I, and a high-pressure outlet pipe. The heat dissipation shield is welded to form a double-sided evaporation heat exchange chamber with upper and lower layers. Each side of the double-sided evaporation heat exchange chamber is provided with fins and microchannels. The microchannels are horizontally arranged in the middle of the evaporation heat exchange chamber, and both sides of the microchannels are fixedly connected to one side of the fins. The other side of the fins is fixedly connected to the adjacent heat dissipation shield. The sidewalls of the double-row connecting pipes are simultaneously fixedly connected to one side of both the upper and lower layers of the double-sided evaporation heat exchange chamber. The two ends of the double-row connecting pipe are fixedly connected to the plug pressure plate respectively; the side wall of the collector pipe II is fixedly connected to the other side of the lower double-sided evaporation heat exchange chamber, the upper end of the collector pipe II is a sealed structure, and the lower end of the collector pipe II is fixedly connected to the high-pressure inlet pipe through the diversion pressure plate; the side wall of the collector pipe I is fixedly connected to the other side of the upper double-sided evaporation heat exchange chamber, the lower end of the collector pipe I is a sealed structure, and the upper end of the collector pipe I is fixedly connected to the high-pressure outlet pipe through the diversion pressure plate; the high-pressure inlet pipe is inserted into the high-pressure inlet and sealed at the insertion point with an O-ring; the high-pressure outlet pipe is inserted into the high-pressure outlet and sealed at the insertion point with an O-ring.

[0010] The elastic liquid-blocking cover has a waist-shaped hole in the middle, a notch for installing the intermediate heat exchanger assembly on one side, and liquid-separating ribs on the upper surface of the elastic liquid-blocking cover.

[0011] The upper part of the pipe cover is provided with an upwardly protruding mounting post, a flow guide groove located on both sides of the mounting post, a flow guide and anti-obstruction protrusion, and a protruding tapered circular hole; the mounting post and the flow guide groove simultaneously pass through the waist-shaped hole of the elastic liquid-blocking cover and are connected to the waist-shaped hole; the upper part of the flow guide groove is connected to the upper part of the elastic liquid-blocking cover, and the lower part of the flow guide groove is connected to the upper part of the pipe cover; the oil return groove is located below the flow guide groove; the flow guide and anti-obstruction protrusion is located above the upper connection between the gas-liquid separation chamber and the inner heat exchange chamber; the protruding tapered circular hole is interference-fitted with the high-pressure outlet pipe provided on the intermediate heat exchanger assembly.

[0012] The internal heat exchange cavity has a rectangular cross-section. A gas-liquid separation cavity and an air inlet cavity are arranged sequentially from the inside to the outside of one long side of the internal heat exchange cavity, or a gas-liquid separation cavity and an air inlet cavity are arranged sequentially from the inside to the outside of both long sides of the internal heat exchange cavity.

[0013] The internal heat exchange chamber has a circular cross-section. A gas-liquid separation chamber and an air inlet chamber are arranged sequentially from the inside to the outside on one side of the internal heat exchange chamber, or a gas-liquid separation chamber and an air inlet chamber are arranged sequentially from the inside to the outside on both sides of the internal heat exchange chamber.

[0014] The cross-section of the internal heat exchange cavity is circular, and the gas-liquid separation cavity and the air inlet cavity are arranged coaxially from the inside to the outside of the internal heat exchange cavity.

[0015] Through the above design scheme, the present invention can bring the following beneficial effects:

[0016] The gas-liquid separator disclosed in this invention has an internal heat exchange chamber located in the center of the cylinder. Because the internal heat exchange chamber is far from the cylinder wall, it is less affected by external temperature. The intermediate heat exchanger assembly is installed in the internal heat exchange chamber, and all evaporation and heat exchange are completed within this chamber. The intermediate heat exchanger assembly adopts a double-sided evaporation structure with upper and lower layers. Each evaporation heat exchange chamber uses a microchannel-encased fin structure, and the inlet and outlet pipes are both made of integrated aluminum alloy, increasing the heat dissipation area and improving heat dissipation performance. These structural features ensure good gas heating and vaporization within the internal heat exchange chamber, resulting in an even lower temperature for the low-temperature, low-pressure gaseous refrigerant. This leads to a higher energy efficiency ratio.

[0017] During heating, the low-temperature, low-pressure gaseous refrigerant can rapidly raise the temperature, enabling the condensed liquid particles to fully vaporize and convert energy, thereby obtaining higher heat and increasing thermal efficiency. Compared to the traditional spiral outer tube heat exchange method, this invention has an absolute advantage in high-efficiency heat exchange.

[0018] In addition to guiding the oil, the guide channel also serves to secure the elastic liquid-blocking cap. The return oil channel is a narrow, perforated groove. Liquid refrigerant forms a thin film on one side of the return oil channel and is directly drawn into the internal heat exchange chamber under negative pressure, achieving rapid oil return. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0020] Figure 1 This is a schematic diagram of the internal structure of a high-efficiency oil-gas-liquid separator with central heat exchange in the internal cavity, according to the present invention. Figure 1 .

[0021] Figure 2 This is a schematic diagram of the internal structure of a high-efficiency oil-gas-liquid separator with central heat exchange in the internal cavity, according to the present invention. Figure 2 .

[0022] Figure 3 This is a schematic diagram of the structure of the inner cylinder of a high-efficiency oil return gas-liquid separator with central heat exchange in the inner cavity according to the present invention.

[0023] Figure 4 This is a schematic diagram of the sealing structure in a high-efficiency oil-gas-liquid separator with central heat exchange in the inner cavity according to the present invention.

[0024] Figure 5 This is a schematic diagram of the elastic liquid-blocking cover in a high-efficiency oil return gas-liquid separator with internal cavity center heat exchange according to the present invention.

[0025] Figure 6 This is a cross-sectional view of the elastic liquid-blocking cover in a high-efficiency oil-gas-liquid separator with internal cavity center heat exchange according to the present invention.

[0026] Figure 7 This is a schematic diagram of the pipe cover in a high-efficiency oil return gas-liquid separator with internal cavity center heat exchange according to the present invention.

[0027] Figure 8 This is a top view of the pipe cover in a high-efficiency oil return gas-liquid separator with internal cavity center heat exchange according to the present invention.

[0028] Figure 9 This is a cross-sectional view of the pipe cover in a high-efficiency oil return gas-liquid separator with internal cavity center heat exchange according to the present invention.

[0029] Figure 10 This is a schematic diagram of the intermediate heat exchanger assembly in a high-efficiency oil-gas-liquid separator with internal cavity center heat exchange according to the present invention.

[0030] Figure 11 This is a schematic diagram illustrating the working principle of the intermediate heat exchanger assembly in a high-efficiency oil-gas-liquid separator with internal cavity center heat exchange according to the present invention.

[0031] Figure 12 This is a top view of the intermediate heat exchanger assembly in a high-efficiency oil-gas-liquid separator with internal cavity center heat exchange according to the present invention.

[0032] Figure 13This is a schematic diagram of the structure of the large filter screen in a high-efficiency oil-gas-liquid separator with internal cavity center heat exchange according to the present invention.

[0033] Figure 14 This is a cross-sectional schematic diagram of the large filter screen in a high-efficiency oil-gas-liquid separator with central heat exchange in the inner cavity according to the present invention.

[0034] Figure 15 This is a schematic diagram of the structure of the oil return hole filter screen in a high-efficiency oil return gas-liquid separator with internal cavity center heat exchange according to the present invention.

[0035] Figure 16 This is a schematic diagram of the pipeline assembly in a high-efficiency oil return gas-liquid separator with internal cavity center heat exchange according to the present invention.

[0036] Figure 17 This is a cross-sectional schematic diagram of the pipeline assembly in a high-efficiency oil return gas-liquid separator with internal cavity center heat exchange according to the present invention.

[0037] Figure 18 This is a top view of the piping assembly in a high-efficiency oil-gas-liquid separator with central heat exchange in the internal cavity, according to the present invention. Figure 1 .

[0038] Figure 19 This is a top view of the piping assembly in a high-efficiency oil-gas-liquid separator with central heat exchange in the internal cavity, according to the present invention. Figure 2 .

[0039] Figure 20 This is a top view of the piping assembly in a high-efficiency oil-gas-liquid separator with central heat exchange in the internal cavity, according to the present invention. Figure 3 .

[0040] Figure 21 This is a top view of the piping assembly in a high-efficiency oil-gas-liquid separator with central heat exchange in the internal cavity, according to the present invention. Figure 4 .

[0041] Figure 22 This is a top view of the piping assembly in a high-efficiency oil-gas-liquid separator with central heat exchange in the internal cavity, according to the present invention. Figure 5 .

[0042] In the diagram, 1-cylinder, 2-cap, 3-elastic liquid-blocking cap, 4-pipeline cap, 5-pipeline assembly, 6-intermediate heat exchanger assembly, 7-large filter screen, 8-oil return hole filter screen, 101-low-pressure inlet, 102-high-pressure outlet, 201-low-pressure outlet, 202-high-pressure inlet, 301-elastic plate, 302-notch, 303-waist hole, 304-liquid distribution rib, 401-mounting column, 402-guide groove, 403-guide and anti-blocking protrusion. 404-Raised tapered round hole, 405-Oil return groove, 501-Air inlet chamber, 502-Gas-liquid separation chamber, 503-Internal heat exchange chamber, 504-Oil return hole, 601-High pressure inlet pipe, 602-Diverter plate, 603-Collector pipe II, 604-Microchannel, 605-Fin, 606-Heat dissipation plate, 607-Double row connecting pipe, 608-Plug plate, 609-Collector pipe I, 610-High pressure outlet pipe, 701-Through hole II. Detailed Implementation

[0043] As shown in the figure, a high-efficiency oil-gas-liquid separator with internal cavity central heat exchange includes a cylinder 1, a cover 2, an elastic liquid-blocking cover 3, a pipeline cover 4, a pipeline assembly 5, an intermediate heat exchanger assembly 6, a large filter screen 7, and an oil return hole filter screen 8.

[0044] The lower opening of the cylinder 1 is fixedly connected to the cover 2. A low-pressure inlet 101 and a high-pressure outlet 102 are provided on the upper top of the cylinder 1. A low-pressure outlet 201 and a high-pressure inlet 202 are provided on the cover 2. Elastic sheets 301 are evenly spaced on the outer periphery of the elastic liquid-blocking cover 3. A notch 302 for installing the intermediate heat exchanger assembly 6 is provided on one side of the elastic liquid-blocking cover 3. A waist hole 303 is provided in the middle of the elastic liquid-blocking cover 3. A liquid-dividing rib 304 is also provided on the upper surface of the elastic liquid-blocking cover 3. The elastic liquid-blocking cover 3 is located at the inner top of the cylinder 1, and the elastic sheets 301 abut against the inner top of the cylinder 1. The upper part of the pipe cover 4 is provided with an upwardly protruding mounting post 401, and [something is missing here, likely related to mounting posts 401]. The system includes a flow guide trough 402, a flow guide and anti-obstruction protrusion 403, and a protrusion tapered circular hole 404. The mounting post 401 and the flow guide trough 402 simultaneously penetrate the waist-shaped hole 303 of the elastic liquid-blocking cover 3 and are connected to it. A gap is left between the upper part of the mounting post 401 and the upper part of the flow guide trough 402 and the inner top of the cylinder 1. The upper part of the flow guide trough 402 communicates with the upper part of the elastic liquid-blocking cover 3, and the lower part of the flow guide trough 402 communicates with the upper part of the pipe cover 4. The flow guide trough 402 guides the liquid refrigerant separated from the elastic liquid-blocking cover 3 by the liquid dividing rib 304 to the pipe cover 4. The liquid refrigerant drips from the outer periphery of the pipe cover 4 to the lower part of the cylinder 1. Under negative pressure, the liquid refrigerant passes through the oil return hole filter screen 8 and then through the oil return hole 504. The liquid refrigerant enters the gas-liquid separation chamber 502, is re-vaporized, and then enters the internal heat exchange chamber 503 along with the gaseous refrigerant. After heat exchange, it is filtered through the large filter screen 7 and discharged through the low-pressure outlet 201. The oil return groove 405 is located below the guide groove 402. The oil return groove 405 is a hollow narrow groove. The liquid refrigerant forms a thin film on one side of the oil return groove 405 and is directly drawn into the internal heat exchange chamber 503 under negative pressure, achieving the purpose of rapid oil return. The guide and anti-obstruction protrusion 403 is located above the upper connection between the gas-liquid separation chamber 502 and the internal heat exchange chamber 503. The protrusion tapered hole 404 is interference-fitted with the high-pressure outlet pipe 610 provided on the intermediate heat exchanger assembly 6.

[0045] The upper part of the pipeline assembly 5 is fixedly connected to the pipeline cover 4, and the lower part of the pipeline assembly 5 is fixedly connected to the large filter screen 7. At the same time, the lower part of the pipeline assembly 5 is snapped into the cover 2. A gap is left between the pipeline assembly 5 and the inner wall of the cylinder 1. The interior of the pipeline assembly 5 is divided into an air inlet chamber 501, a gas-liquid separation chamber 502, and an internal heat exchange chamber 503 by the pipe wall arranged along the axial direction. An oil return hole 504 is provided on the lower part of the outer side wall of the pipeline assembly 5 corresponding to the air inlet chamber 501. The internal heat exchange chamber 503 is located at the central axis of the cylinder. The outer side of the internal heat exchange chamber 503 has the gas-liquid separation chamber 502 and the air inlet chamber 501 arranged from the inside to the outside. The upper part of the air inlet chamber 501 communicates with the inner cavity of the cylinder 1, and the lower part of the air inlet chamber 501 communicates with the lower part of the gas-liquid separation chamber 502. The upper part of the gas-liquid separation chamber 502 is connected to the upper part of the inner heat exchange chamber 503, and the upper part of the connection is correspondingly set with the flow guiding and anti-blocking protrusion 403; the intermediate heat exchanger assembly 6 is fixedly installed in the inner heat exchange chamber 503 of the pipeline assembly 5 and leaves a gap with the side wall of the inner heat exchange chamber 503; the upper pipeline of the intermediate heat exchanger assembly 6 passes through the protruding tapered circular hole 404 and the notch 302 in sequence and is connected to the high pressure outlet 102; the lower pipeline of the intermediate heat exchanger assembly 6 passes through the through hole II 701 on the large filter screen 7 and is fixedly connected to the high pressure inlet 202; the oil return hole filter screen 8 is set outside the oil return hole 504; the low pressure inlet 101 is connected to the interior of the cylinder 1; the low pressure outlet 201 is connected to the lower part of the inner heat exchange chamber 503.

[0046] The intermediate heat exchanger assembly 6 includes a high-pressure inlet pipe 601, a flow divider plate 602, a collector pipe II 603, a microchannel 604, fins 605, a heat dissipation guard plate 606, a double-row connecting pipe 607, a plug plate 608, a collector pipe I 609, and a high-pressure outlet pipe 610. The heat dissipation guard plate 606 is welded to form a double-sided evaporation heat exchange chamber with upper and lower layers. Each side of the double-sided evaporation heat exchange chamber is provided with fins 605 and microchannels 604. The microchannels 604 are horizontally arranged in the middle of the evaporation heat exchange chamber, and both sides of the microchannels 604 are fixedly connected to one side of the fins 605 respectively. The other side of the fins 605 is fixedly connected to the adjacent heat dissipation guard plate 606. The sidewalls of the double-row connecting pipes 607 are simultaneously fixedly connected to one side of both the upper and lower layers of the double-sided evaporation heat exchange chamber. The two ends of the tube are fixedly connected to the plug pressure plate 608 respectively; the side wall of the collecting tube II 603 is fixedly connected to the other side of the lower double-sided evaporation heat exchange chamber, the upper end of the collecting tube II 603 is a sealed structure, and the lower end of the collecting tube II 603 is fixedly connected to the high pressure inlet tube 601 through the diversion pressure plate 602; the side wall of the collecting tube I 609 is fixedly connected to the other side of the upper double-sided evaporation heat exchange chamber, the lower end of the collecting tube I 609 is a sealed structure, and the upper end of the collecting tube I 609 is fixedly connected to the high pressure outlet tube 610 through the diversion pressure plate 602; the high pressure inlet tube 601 passes through the through hole II 701 and is inserted into the high pressure inlet 202 and sealed at the insertion point by an O-ring; the high pressure outlet tube 610 passes through the raised tapered round hole 404 and the notch 302 in sequence and is inserted into the high pressure outlet 102 and sealed at the insertion point by an O-ring.

[0047] The intermediate heat exchanger assembly 6 has fins installed in its internal heat exchange channels.

[0048] The internal heat exchange cavity 503 can have the following structures:

[0049] 1. The cross-section of the internal heat exchange cavity 503 is rectangular. A gas-liquid separation cavity 502 and an air inlet cavity 501 are arranged sequentially from the inside to the outside of one long side of the internal heat exchange cavity 503.

[0050] 2. The cross-section of the internal heat exchange cavity 503 is rectangular. The gas-liquid separation cavity 502 and the air inlet cavity 501 are arranged sequentially from the inside to the outside on the two long sides of the internal heat exchange cavity 503.

[0051] 3. The cross-section of the internal heat exchange chamber 503 is circular. On one side of the internal heat exchange chamber 503, the gas-liquid separation chamber 502 and the air inlet chamber 501 are arranged sequentially from the inside to the outside.

[0052] 4. The cross-section of the internal heat exchange chamber 503 is circular. On both sides of the internal heat exchange chamber 503, a gas-liquid separation chamber 502 and an air inlet chamber 501 are arranged sequentially from the inside to the outside.

[0053] 5. The cross-section of the internal heat exchange chamber 503 is circular. The gas-liquid separation chamber 502 and the air inlet chamber 501 are arranged coaxially from the inside to the outside of the internal heat exchange chamber 503.

[0054] Work process:

[0055] The oil-gas mixed refrigerant enters the elastic liquid-blocking cover 3 through the low-pressure inlet 101. The gaseous refrigerant enters the gap between the cylinder 1 and the pipeline assembly 5 through the gaps on both sides of the elastic plate 301 of the elastic liquid-blocking cover 3. The liquid refrigerant accumulates on the elastic liquid-blocking cover 3, is separated by the liquid-distributing rib 304, and then guided to the pipeline cover 4 through the guide groove 402 and drips down along the outer periphery of the pipeline cover 4. The gaseous refrigerant enters from the upper inlet of the air inlet chamber 501, enters the gas-liquid separation chamber 502 from the lower outlet of the air inlet chamber 501, and then enters the internal heat exchange chamber 503 from the upper part of the gas-liquid separation chamber 502. An intermediate heat exchanger assembly 6 is intermittently installed in the internal heat exchange chamber 503. High-pressure refrigerant enters from the high-pressure inlet 202, flows upwards into the collector tube II 603, passes through the lower double-sided evaporation heat exchange chamber, enters the double-row connecting pipe 607, and then enters the upper double-sided evaporation heat exchange chamber from the top of the double-row connecting pipe 607. After the aforementioned curved transmission, it enters the high-pressure outlet pipe 610 and exits through the high-pressure outlet 102. Each evaporation heat exchange chamber employs a microchannel-encased fin structure, and both the high-pressure inlet pipe 601 and the high-pressure outlet pipe 610 are made of integrated aluminum alloy, increasing the heat dissipation area and improving heat dissipation performance. During the downward transmission of the gaseous refrigerant through the gap between the internal heat exchange chamber 503 and the intermediate heat exchanger assembly 6, it exchanges heat with the intermediate heat exchanger assembly 6, and then, after filtration through the large filter screen 7, it is discharged through the low-pressure outlet 201. Under negative pressure, the liquid refrigerant is filtered through the oil return hole filter 8 and then enters the gas-liquid separation chamber 502 through the oil return hole 504. The liquid particles condensed here are heated and fully vaporized, and then enter the internal heat exchange chamber 503 along with the gaseous refrigerant. After heat exchange, they are filtered through the large filter 7 and discharged through the low-pressure outlet 201.

Claims

1. A high-efficiency oil-gas-liquid separator with central heat exchange in its internal cavity, characterized in that: It includes a cylinder (1), a cover (2), an elastic liquid-blocking cover (3), a pipeline cover (4), a pipeline assembly (5), an intermediate heat exchanger assembly (6), a large filter screen (7), and an oil return hole filter screen (8). The cylinder (1) and the cover (2) are fixedly connected to form the cavity of the gas-liquid separator. The upper part of the cavity is provided with a low-pressure inlet (101) and a high-pressure outlet (102), and the lower part of the cavity is provided with a low-pressure outlet (201) and a high-pressure inlet (202). The elastic liquid-blocking cover (3) is provided with elastic pieces (301) evenly spaced on its outer periphery. The elastic liquid-blocking cover (3) is located at the inner top of the cavity and the elastic pieces (301) abut against the inner top of the cavity. The upper part of the pipe cover (4) is fixedly connected to the elastic liquid-blocking cover (3) and receives the liquid flowing down from the elastic liquid-blocking cover (3). The lower part of the pipe cover (4) is fixedly connected to the pipe assembly (5). The upper part of the pipe cover (4) is provided with an oil return groove (405). The oil return groove (405) is a hollow narrow groove. The oil return groove (405) connects the upper part of the pipe cover (4) with the internal heat exchange chamber (503) of the pipe assembly (5). The lower part of the pipeline assembly (5) is fixedly connected to the large filter screen (7), and the lower edge of the pipeline assembly (5) is snapped into the cover (2). There is a gap between the pipeline assembly (5) and the inner wall of the cylinder (1). The interior of the pipeline assembly (5) is divided into an air inlet chamber (501), a gas-liquid separation chamber (502), and an internal heat exchange chamber (503) by the pipe wall arranged along the axial direction. The pipeline assembly (5) is provided with an oil return hole (504) on the lower part of the outer side wall corresponding to the air inlet chamber (501). The internal heat exchange chamber (503) is located at the central axis of the cylinder. The outer side of the internal heat exchange chamber (503) is composed of a gas-liquid separation chamber (502) and an air inlet chamber (501) from the inside out. The upper part of the air inlet chamber (501) is connected to the inner cavity of the cylinder (1), and the lower part of the air inlet chamber (501) is connected to the inner cavity of the cylinder (1). The lower part of the gas-liquid separation chamber (502) is connected to the upper part of the internal heat exchange chamber (503); the intermediate heat exchanger assembly (6) is fixedly installed in the internal heat exchange chamber (503) and has a gap with the side wall of the internal heat exchange chamber (503); the upper pipeline of the intermediate heat exchanger assembly (6) passes through the pipeline cover (4) and the elastic liquid-blocking cover (3) in sequence and is connected to the high pressure outlet (102); the lower pipeline of the intermediate heat exchanger assembly (6) passes through the large filter screen (7) and is fixedly connected to the high pressure inlet (202); the oil return hole filter screen (8) is set outside the oil return hole (504); the low pressure inlet (101) is connected to the inside of the cavity; the low pressure outlet (201) is connected to the lower part of the internal heat exchange chamber (503); The elastic liquid-blocking cover (3) has a waist-shaped hole (303) in the middle and a notch (302) for installing the intermediate heat exchanger assembly (6) on one side. The internal heat exchange chamber (503) has a rectangular cross-section. A gas-liquid separation chamber (502) and an air inlet chamber (501) are arranged sequentially from the inside to the outside of one long side of the internal heat exchange chamber (503). Alternatively, a gas-liquid separation chamber (502) and an air inlet chamber (501) are arranged sequentially from the inside to the outside of both long sides of the internal heat exchange chamber (503).

2. The high-efficiency oil-gas-liquid separator with internal cavity center heat exchange according to claim 1, characterized in that: The intermediate heat exchanger assembly (6) includes a high-pressure inlet pipe (601), a flow divider plate (602), a collector pipe II (603), a microchannel (604), fins (605), a heat dissipation guard plate (606), a double-row connecting pipe (607), a plug plate (608), a collector pipe I (609), and a high-pressure outlet pipe (610). The heat dissipation guard plate (606) is welded to form a double-sided evaporation heat exchange chamber with upper and lower layers. Each side of the double-sided evaporation heat exchange chamber is provided with fins (605) and microchannels (604). The microchannels (604) are arranged laterally in the middle of the evaporation heat exchange chamber, and the two sides of the microchannels (604) are fixedly connected to one side of the fins (605). The other side of the fins (605) is fixedly connected to the adjacent heat dissipation guard plate (606). The sidewall of the double-row connecting pipe (607) is simultaneously connected to the double-sided evaporation heat exchange chamber of the upper and lower layers. One side of the cavity is fixedly connected, and the two ends of the double-row connecting pipe (607) are fixedly connected to the plug pressure plate (608) respectively; the side wall of the collecting pipe II (603) is fixedly connected to the other side of the lower double-sided evaporation heat exchange cavity, the upper end of the collecting pipe II (603) is a sealed structure, and the lower end of the collecting pipe II (603) is fixedly connected to the high-pressure inlet pipe (601) through the diversion pressure plate (602); the side wall of the collecting pipe I (609) is fixedly connected to the upper The other side of the double-sided evaporation heat exchange chamber is fixedly connected. The lower end of the collector tube I (609) is a sealed structure. The upper end of the collector tube I (609) is fixedly connected to the high pressure outlet tube (610) through the diversion pressure plate (602). The high pressure inlet tube (601) is inserted into the high pressure inlet (202) and sealed at the insertion point with an O-ring. The high pressure outlet tube (610) is inserted into the high pressure outlet (102) and sealed at the insertion point with an O-ring.

3. The high-efficiency oil-gas-liquid separator with internal cavity center heat exchange according to claim 1, characterized in that: The upper surface of the elastic liquid-blocking cap (3) is also provided with liquid-separating ribs (304).

4. The high-efficiency oil-gas-liquid separator with internal cavity center heat exchange according to claim 3, characterized in that: The upper part of the pipe cover (4) is provided with an upwardly protruding mounting post (401), a flow guide groove (402) located on both sides of the mounting post (401), a flow guide and anti-blocking protrusion (403), and a protruding tapered circular hole (404); the mounting post (401) and the flow guide groove (402) simultaneously penetrate the waist-shaped hole (303) of the elastic liquid blocking cover (3) and are connected to the waist-shaped hole (303); the upper part of the flow guide groove (402) is connected to the elastic liquid blocking cover (3). The upper part of the cover (3) is connected, and the lower part of the guide groove (402) is connected to the upper part of the pipe cover (4); the return oil groove (405) is located below the guide groove (402); the guide anti-blocking protrusion (403) is located above the upper connection between the gas-liquid separation chamber (502) and the inner heat exchange chamber (503); the protrusion tapered hole (404) is interference-fitted with the high pressure outlet pipe (610) provided on the intermediate heat exchanger assembly (6).

5. A high-efficiency oil-gas-liquid separator with central heat exchange in the inner cavity according to claim 1, characterized in that: The cross-section of the internal heat exchange chamber (503) is circular. On one side of the internal heat exchange chamber (503), a gas-liquid separation chamber (502) and an air inlet chamber (501) are arranged sequentially from the inside to the outside. Alternatively, on both sides of the internal heat exchange chamber (503), a gas-liquid separation chamber (502) and an air inlet chamber (501) are arranged sequentially from the inside to the outside.

6. A high-efficiency oil-gas-liquid separator with internal cavity center heat exchange according to claim 1, characterized in that: The cross-section of the internal heat exchange chamber (503) is circular, and the gas-liquid separation chamber (502) and the air inlet chamber (501) are arranged coaxially from the inside to the outside of the internal heat exchange chamber (503).

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