External oil separation and gas separation combined structure with heat exchange function

Abstract

The utility model discloses an external oil separation and gas separation combined structure with a heat exchange function, a gas-liquid separation unit comprises an upper end cover, a shell body and a lower end cover, the upper end cover, the shell body and the lower end cover define a gas-liquid separation space, and an oil separation unit comprises a shell, a second liquid inlet pipe, a second gas outlet pipe and a liquid outlet pipe. The shell is arranged on the outer side of the gas-liquid separation unit in a sleeving mode, the shell and the gas-liquid separation unit form an oil-gas separation space, the oil-gas separation space is used for oil-gas separation, and the second liquid inlet pipe, the second gas outlet pipe and the liquid outlet pipe are all communicated with the gas-liquid separation space. The gas-liquid separation unit and the oil separation unit do not need to be connected through a connecting pipeline, the occupied space is reduced, meanwhile, the gas-liquid separation unit and the oil separation unit are combined, a low-temperature refrigerant in the gas-liquid separation unit can exchange heat with a high-temperature refrigerant in the oil separation unit, the low-temperature refrigerant is completely gaseous, and the liquid impact phenomenon caused by the fact that the compressor sucks the liquid refrigerant is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of refrigeration technology, and in particular relates to a structure that combines external oil separator and gas separator with heat exchange. Background Technology

[0002] The heart of an air conditioning system is the compressor, and the gas-liquid separator is typically installed on the low-pressure pipe between the compressor and the four-way valve. The function of the gas-liquid separator is to separate and retain the liquid refrigerant in the return pipe, preventing liquid slugging in the compressor. The gas-liquid separator protects the compressor, hence its widespread use in air conditioning systems. A suitable gas-liquid separator can effectively protect the compressor, improve system reliability, extend the length of connectable piping, and enhance the competitiveness of the air conditioner.

[0003] The oil return problem has always been one of the key factors restricting the development of air conditioning systems that often use multi-compressor parallel systems. Therefore, it is necessary to add gas-liquid separators and oil separators to the refrigeration system to protect it. However, in the existing technology, the gas-liquid separator and oil separator are installed separately, and complex connecting pipes are required between them. This not only increases the manufacturing cost but also occupies a large space, making it inconvenient to use in small air conditioning units. Utility Model Content

[0004] The purpose of this invention is to solve the aforementioned technical problems in the prior art and to provide an external oil separator and gas separator combination structure that combines heat exchange. By combining the gas-liquid separation unit and the oil separation unit, the gas-liquid separation unit and the oil separation unit do not need to be connected by connecting pipes, thus reducing the space occupied. At the same time, by combining the two, the low-temperature refrigerant in the gas-liquid separation unit can exchange heat with the high-temperature refrigerant in the oil separation unit, so that the low-temperature refrigerant is completely gaseous, avoiding liquid slugging caused by the compressor drawing in liquid refrigerant.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A structure combining external oil and gas separators with heat exchange capabilities, including...

[0007] The gas-liquid separation unit includes an upper end cover, a shell, and a lower end cover. The upper end cover, the shell, and the lower end cover together form a gas-liquid separation space, which is used for gas-liquid separation.

[0008] The oil separation unit includes a housing, a second liquid inlet pipe, a second gas outlet pipe, and a liquid outlet pipe. The housing is fitted outside the gas-liquid separation unit. The housing and the gas-liquid separation unit form an oil-gas separation space, which is used for oil-gas separation. The second liquid inlet pipe, the second gas outlet pipe, and the liquid outlet pipe are all connected to the gas-liquid separation space.

[0009] By combining the gas-liquid separation unit and the oil separation unit, the gas-liquid separation unit and the oil separation unit do not need to be connected by connecting pipes, which reduces the space occupied. At the same time, by combining the two, the low-temperature refrigerant in the gas-liquid separation unit can exchange heat with the high-temperature refrigerant in the oil separation unit, so that the low-temperature refrigerant is completely gaseous, avoiding liquid slugging caused by the compressor drawing in liquid refrigerant.

[0010] Furthermore, the upper end cover, the shell body, and the lower end cover are welded together to form a gas-liquid separation unit. Both the upper end cover and the lower end cover are provided with a first welding part. The two ends of the shell body are inserted into the upper end cover and the lower end cover and welded and fixed with the first welding part.

[0011] Furthermore, the gas-liquid separation unit also includes a first liquid inlet pipe and a first gas outlet pipe. The first liquid inlet pipe is connected to the gas-liquid separation space, with one end extending out of the gas-liquid separation space and welded to the upper end cover. The first gas outlet pipe is installed in the gas-liquid separation space, with one end extending out of the gas-liquid separation space and welded to the upper end cover.

[0012] Furthermore, the first liquid inlet pipe has a liquid inlet at one end extending out of the gas-liquid separation space, the first gas outlet pipe has an air inlet at one end located in the gas-liquid separation space, and the first gas outlet pipe has an air outlet at one end extending out of the gas-liquid separation space.

[0013] Furthermore, the first exhaust pipe includes an intake section, a connecting section, and an exhaust section. The intake section is located in the gas-liquid separation space, and the intake port is opened on the intake section. The exhaust section passes through the upper end cover, and the exhaust port is opened on the exhaust section. The connecting section is used to connect the intake section and the exhaust section.

[0014] Furthermore, the first exhaust pipe is equipped with an oil return hole and a pressure equalization hole. The oil return hole is located on the connecting section and a filter screen is installed in the oil return hole. The pressure equalization hole is located on the exhaust section.

[0015] Furthermore, the shell has a cylindrical structure with narrow ends. Both ends of the shell are provided with a second welding part. The shell is welded to the outside of the shell body through the second welding part, forming an oil-gas separation space between the shell and the shell body. The second gas outlet pipe is welded to the top of the side of the shell, the liquid outlet pipe is welded to the bottom of the side of the shell, and the second liquid inlet pipe is welded to the side of the shell and located between the second gas outlet pipe and the liquid outlet pipe.

[0016] Furthermore, it also includes a filter layer, which is installed in the oil-gas separation space and located between the second liquid inlet pipe and the second gas outlet pipe.

[0017] Furthermore, it also includes a baffle plate, which is cylindrical and installed in the oil-gas separation space. The baffle plate divides the oil-gas separation space into a first space and a second space. The baffle plate is provided with baffle holes, and the first space and the second space are connected through the baffle holes.

[0018] Furthermore, the shell has a U-shaped cross-section, and a third welding part is provided at one end of the shell opening. The shell is welded to the outside of the shell body through the third welding part, and an oil-gas separation space is formed between the shell, the shell body and the lower end cover. The second gas outlet pipe and the second liquid inlet pipe are welded to the side of the shell, and the liquid outlet pipe is welded to the bottom of the shell.

[0019] This utility model, by adopting the above-mentioned technical solution, has the following beneficial effects:

[0020] In this invention, the gas-liquid separation unit includes an upper cover, a shell, and a lower cover. The upper cover, shell, and lower cover together form a gas-liquid separation space. The oil separation unit includes a shell, a second inlet pipe, a second outlet pipe, and an outlet pipe. The shell is fitted onto the outside of the gas-liquid separation unit. The shell and the gas-liquid separation unit form an oil-gas separation space, which is used for oil-gas separation. The second inlet pipe, the second outlet pipe, and the outlet pipe are all connected to the gas-liquid separation space. By combining the gas-liquid separation unit and the oil separation unit, it is not necessary to connect the gas-liquid separation unit and the oil separation unit through connecting pipes, thus reducing the space occupied. At the same time, by combining the two, the low-temperature refrigerant in the gas-liquid separation unit can exchange heat with the high-temperature refrigerant in the oil separation unit, so that the low-temperature refrigerant is completely gaseous, avoiding liquid slugging caused by the compressor drawing in liquid refrigerant. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of a structural embodiment of an external oil separator and gas separator combination with heat exchange according to the present invention;

[0023] Figure 2 This utility model Figure 1 Top view;

[0024] Figure 3 This is a schematic diagram of a second embodiment of the present invention, which combines an external oil separator and a gas separator with heat exchange.

[0025] Figure 4 This is a schematic diagram of a third embodiment of the present invention, which combines an external oil separator and a gas separator with heat exchange.

[0026] Figure 5 This is a schematic diagram of a fourth embodiment of the present invention, which combines an external oil separator and a gas separator with heat exchange.

[0027] Figure 6 This is a structural schematic diagram of a fifth embodiment of the present invention, which combines an external oil separator and a gas separator with heat exchange.

[0028] Figure 7This is a schematic diagram of a sixth embodiment of the present invention, which combines an external oil separator and a gas separator with heat exchange.

[0029] Figure 8 This is a structural schematic diagram of embodiment seven of the present invention, which combines an external oil separator and a gas separator with heat exchange.

[0030] In the diagram: 1-Gas-liquid separation unit; 2-Upper end cover; 3-Shell body; 4-Lower end cover; 5-Gas-liquid separation space; 6-Oil separation unit; 7-Shell body; 8-Second liquid inlet pipe; 9-Second gas outlet pipe; 10-Liquid outlet pipe; 11-Oil-gas separation space; 12-First welded part; 13-First liquid inlet pipe; 14-First gas outlet pipe; 15-Liquid inlet; 16-Gas inlet; 17-Gas outlet; 18-Gas inlet section; 19-Connecting section; 20-Gas outlet section; 21-Oil return hole; 22-Pressure equalization hole; 23-Filter screen; 24-Second welded part; 25-Filter layer; 26-Baffle plate; 27-First space; 28-Second space; 29-Baffle hole; 30-Third welded part; 31-Welding ring. Detailed Implementation

[0031] Example 1

[0032] like Figures 1 to 2 As shown, this utility model discloses an external oil and gas separator combination structure that combines heat exchange. It includes a gas-liquid separation unit 1 and an oil separation unit 6. The gas-liquid separation unit 1 includes an upper end cover 2, a shell 3, and a lower end cover 4. The upper end cover 2, shell 3, and lower end cover 4 together form a gas-liquid separation space 5, which is used for gas-liquid separation. The oil separation unit 6 includes a shell 7, a second liquid inlet pipe 8, a second gas outlet pipe 9, and a liquid outlet pipe 10. The shell 7 is sleeved on the outside of the gas-liquid separation unit 1. The shell 7 and the gas-liquid separation unit 1 form an oil-gas separation space 11, which is used for oil-gas separation. The second liquid inlet pipe 8, the second gas outlet pipe 9, and the liquid outlet pipe 10 are all connected to the gas-liquid separation space 5.

[0033] This invention combines a gas-liquid separation unit 1 and an oil separation unit 6, eliminating the need for connecting pipes between them and reducing space requirements. Furthermore, by combining the two, the low-temperature refrigerant in the gas-liquid separation unit 1 can exchange heat with the high-temperature refrigerant in the oil separation unit 6, ensuring that the low-temperature refrigerant is completely gaseous and preventing liquid slugging caused by the compressor drawing in liquid refrigerant.

[0034] In this embodiment, the shell 3 has a cylindrical structure. The upper end cover 2 and the lower end cover 4 are flared outward to form a first welding part 12. The two ends of the shell 3 are inserted into the upper end cover 2 and the lower end cover 4 and welded to the first welding part 12. The two ends of the shell 3 are welded to the upper end cover 2 and the lower end cover 4 to form a gas-liquid separation unit 1. The first welding part 12 is provided to avoid the formation of gaps after the gas-liquid separation unit 1 is welded.

[0035] The gas-liquid separation unit 1 also includes a first liquid inlet pipe 13 and a first gas outlet pipe 14. The first liquid inlet pipe 13 is installed in and communicates with the gas-liquid separation space 5. The other end of the first liquid inlet pipe 13 extends out of the gas-liquid separation space 5 and is welded to the upper end cover 2. The end of the first liquid inlet pipe 13 extending out of the gas-liquid separation space 5 is provided with a liquid inlet. The first gas outlet pipe 14 is provided with a gas inlet 16 and a gas outlet 17. The first gas outlet pipe 14 includes a gas inlet section 18, a connecting section 19 and a gas outlet section. 20. The inlet section 18 and the outlet section 20 are connected by the connecting section 19. The inlet section 18 is located in the gas-liquid separation space 5 and is connected to the gas-liquid separation space 5. The inlet port 16 is opened on the inlet section 18. The outlet section 20 extends through the upper end cover 2, extends out of the gas-liquid separation space 5 and is welded to the upper end cover 2. The outlet port 17 is opened on the outlet section 20. The height of the inlet port 16 is higher than the height of the refrigerant entering the gas-liquid separation space 5 to prevent the liquid refrigerant from entering the first outlet pipe 14.

[0036] The first exhaust pipe 14 is provided with an oil return hole 21 and a pressure equalization hole 22. The oil return hole 21 is located on the connecting section 19, and a filter screen 23 is installed in the oil return hole 21. The pressure equalization hole 22 is opened on the exhaust section 20. The setting of the pressure equalization hole 22 can prevent impurities from being blocked by the filter screen 23 when the compressor is not running, increase the filtration and purification degree of particulate refrigerant oil, and reduce the oil carryover rate of refrigerant. The setting of the oil return hole 21 can ensure that the refrigerant oil can return to the compressor as much as possible.

[0037] In this embodiment, the shell 7 has a cylindrical structure with narrowed ends. Both ends of the shell 7 are provided with a second welding part 24. The shell 7 is welded to the outside of the shell body 3 through the second welding part 24. An oil-gas separation space 11 is formed between the shell 7 and the shell body 3. The second gas outlet pipe 9 is welded to the top of the side of the shell 7, and the liquid outlet pipe 10 is welded to the bottom of the side of the shell 7. The second liquid inlet pipe 8 is welded to the side of the shell 7 and is located between the second gas outlet pipe 9 and the liquid outlet pipe 10. A filter layer 25 is also installed in the oil-gas separation space 11. The filter layer 25 is located between the second liquid inlet pipe 8 and the second gas outlet pipe 9. After oil-gas separation, the separated gas passes through the filter layer 25 and is finally discharged through the second gas outlet pipe 9. The design of the filter layer 25 can prevent the passage of impurities.

[0038] In this invention, the low-temperature gas-liquid two-phase refrigerant from the evaporator enters the gas-liquid separation space 5 through the inlet and the first inlet pipe 13, while the high-temperature gas-liquid two-phase refrigerant enters the oil-gas separation space 11 through the second inlet pipe 8. Through the combined design of the gas-liquid separation unit 1 and the oil separation unit 6, the low-temperature gas-liquid two-phase refrigerant in the gas-liquid separation space 5 and the high-temperature gas-liquid two-phase refrigerant in the oil-gas separation space 11 exchange heat through conduction. After the high-temperature gas-liquid two-phase refrigerant enters the oil-gas separation space 11, gas-liquid separation occurs due to gravity. The separated gas is discharged through the second outlet pipe 9. After heat exchange, the temperature of the high-temperature liquid refrigerant in the oil-gas separation space 11 is effectively reduced. Then, it enters the condenser through the liquid outlet pipe 10 to increase the heat exchange performance. The low-temperature gas-liquid two-phase refrigerant in the gas-liquid separation space 5 evaporates into a gaseous state after heat exchange. It is then drawn into the compressor through the first outlet pipe 14, which prevents the compressor from drawing in liquid refrigerant and avoids liquid slugging. At the same time, the overheated gaseous state reduces the compressor's work and reduces power loss.

[0039] Example 2

[0040] like Figure 3 As shown, based on the structure of Embodiment 1, in Embodiment 2 the shell 7 has a cylindrical structure. The two ends of the cylindrical shell 7 are second welding parts 24. A welding ring 31 is provided between the shell 7 and the shell body. The shell 7 is welded to the outside of the shell body 3 through the second welding parts 24 and the welding ring 31. The upper end cover 2 and the lower end cover 4 are welded and fixed to the welding ring 31 through the first welding part 12.

[0041] Example 3

[0042] like Figure 4 As shown, based on the structure of Embodiment 1, Embodiment 3 installs a baffle plate 26 in the oil-gas separation space 11. The baffle plate 26 is cylindrical. The design of the baffle plate 26 divides the oil-gas separation space 11 into a first space 27 and a second space 28. The design of the baffle plate 26 reduces the flow rate of the high-temperature gas-liquid two-phase refrigerant entering the oil-gas separation space 11, thereby improving the heat exchange effect. The baffle plate 26 is provided with baffle holes 29, and the first space 27 and the second space 28 are connected through the baffle holes 29.

[0043] In this embodiment, both the second liquid inlet pipe 8 and the liquid outlet pipe 10 are connected to the second space 28, while the second gas outlet pipe 9 is connected to the first space 27. The high-temperature gas-liquid two-phase refrigerant enters the second space 28 through the second liquid inlet pipe 8, the flow rate is reduced by the baffle plate 26, and gas-liquid separation is carried out in the second space 28. The separated liquid flows out through the liquid outlet pipe 10, and the gas enters the first space 27 through the baffle hole 29 and is finally discharged through the second gas outlet pipe 9.

[0044] Example 4

[0045] like Figure 5 As shown, based on the structure of Embodiment 3, in Embodiment 4, the shell 7 has a cylindrical structure. The two ends of the cylindrical shell 7 are the second welding parts 24. The baffle plate 26 is designed separately from the shell 7. A welding ring 31 is provided between the shell 7 and the baffle plate 26. The shell 7 and the baffle plate 26 are welded and fixed by the welding ring 31. A welding ring 31 is provided between the baffle plate 26 and the shell body 3. The baffle plate 26 and the shell body 3 are welded and fixed by the welding ring 31.

[0046] Example 5

[0047] like Figure 6 As shown, based on the structure of Embodiment 3, in this embodiment, the second liquid inlet pipe 8 is connected to the first space 27, and the liquid outlet pipe 10 and the second gas outlet pipe 9 are both connected to the second space 28. The high-temperature gas-liquid two-phase refrigerant enters the first space 27 through the second liquid inlet pipe 8, the flow rate is reduced by the baffle plate 26, and gas-liquid separation is carried out in the first space 27. Then, it flows into the second space 28 through the baffle hole 29. The separated liquid flows out through the liquid outlet pipe 10, and the gas is discharged through the second gas outlet pipe 9.

[0048] Example 6

[0049] like Figure 7 As shown, based on the structure of Embodiment 5, in Embodiment 6 the shell 7 has a cylindrical structure. The two ends of the cylindrical shell 7 are the second welding parts 24. The baffle plate 26 is designed separately from the shell 7. A welding ring 31 is provided between the shell 7 and the baffle plate 26. The shell 7 and the baffle plate 26 are welded and fixed by the welding ring 31. A welding ring 31 is provided between the baffle plate 26 and the shell body 3. The baffle plate 26 and the shell body 3 are welded and fixed by the welding ring 31.

[0050] Example 7

[0051] like Figure 8 As shown, based on the structure of Embodiment 1, Embodiment 4 makes another design to the structure of the shell 7. The cross-section of the shell 7 is U-shaped. One end of the shell 7 opening is provided with a third welding part 30. The shell 7 is welded to the outside of the shell body 3 through the third welding part 30. An oil-gas separation space 11 is formed between the shell 7, the shell body 3 and the lower end cover 4. The second gas outlet pipe 9 and the second liquid inlet pipe 8 are welded to the side of the shell 7. The liquid outlet pipe 10 is welded to the bottom of the shell 7. In this embodiment, the shell 7 can completely cover the shell body 3 or partially cover it. The specific design can be made according to the actual use.

[0052] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A structure combining an external oil separator and a gas separator with heat exchange, characterized in that: include A gas-liquid separation unit, comprising an upper end cover, a shell, and a lower end cover, wherein the upper end cover, the shell, and the lower end cover together form a gas-liquid separation space, which is used for gas-liquid separation; An oil separation unit includes a housing, a second liquid inlet pipe, a second gas outlet pipe, and a liquid outlet pipe. The housing is sleeved on the outside of the gas-liquid separation unit. The housing and the gas-liquid separation unit form an oil-gas separation space, which is used for oil-gas separation. The second liquid inlet pipe, the second gas outlet pipe, and the liquid outlet pipe are all connected to the gas-liquid separation space.

2. The structure of an external oil separator and gas separator with heat exchange as described in claim 1, characterized in that: The upper end cover, the shell body, and the lower end cover are welded together to form the gas-liquid separation unit. Both the upper end cover and the lower end cover are provided with a first welding part. The two ends of the shell body are inserted into the upper end cover and the lower end cover and welded and fixed with the first welding part.

3. The structure of an external oil separator and gas separator with heat exchange as described in claim 1, characterized in that: The gas-liquid separation unit further includes a first liquid inlet pipe and a first gas outlet pipe. The first liquid inlet pipe is connected to the gas-liquid separation space. One end of the first liquid inlet pipe extends out of the gas-liquid separation space and is welded and fixed to the upper end cover. The first gas outlet pipe is installed in the gas-liquid separation space. One end of the first gas outlet pipe extends out of the gas-liquid separation space and is welded to the upper end cover.

4. The structure of an external oil separator and gas separator with heat exchange as described in claim 3, characterized in that: The first liquid inlet pipe has a liquid inlet at one end extending out of the gas-liquid separation space, the first gas outlet pipe has a gas inlet at one end located in the gas-liquid separation space, and the first gas outlet pipe has a gas outlet at one end extending out of the gas-liquid separation space.

5. The structure of an external oil separator and gas separator with heat exchange as described in claim 4, characterized in that: The first air outlet pipe includes an air inlet section, a connecting section, and an air outlet section. The air inlet section is located in the gas-liquid separation space, and the air inlet is opened on the air inlet section. The air outlet section passes through the upper end cover, and the air outlet is opened on the air outlet section. The connecting section is used to connect the air inlet section and the air outlet section.

6. The structure of an external oil separator and gas separator with heat exchange as described in claim 5, characterized in that: The first air outlet pipe is provided with an oil return hole and a pressure equalization hole. The oil return hole is located on the connecting section and a filter screen is installed in the oil return hole. The pressure equalization hole is opened on the air outlet section.

7. The structure of an external oil separator and gas separator with heat exchange as described in claim 1, characterized in that: The shell is a cylindrical structure with narrow ends. Both ends of the shell are provided with a second welding part. The shell is welded to the outside of the shell body through the second welding part. The oil-gas separation space is formed between the shell and the shell body. The second gas outlet pipe is welded to the top of the side of the shell. The liquid outlet pipe is welded to the bottom of the side of the shell. The second liquid inlet pipe is welded to the side of the shell and located between the second gas outlet pipe and the liquid outlet pipe.

8. The structure of an external oil separator and gas separator with heat exchange as described in claim 7, characterized in that: It also includes a filter layer, which is installed in the oil-gas separation space and is located between the second liquid inlet pipe and the second gas outlet pipe.

9. The structure of an external oil separator and gas separator with heat exchange as described in claim 7, characterized in that: It also includes a baffle plate, which is cylindrical and installed in the oil-gas separation space. The baffle plate divides the oil-gas separation space into a first space and a second space. The baffle plate is provided with baffle holes, and the first space and the second space are connected through the baffle holes.

10. The structure of an external oil separator and gas separator with heat exchange as described in claim 1, characterized in that: The shell has a U-shaped cross-section. One end of the shell opening is provided with a third welding part. The shell is welded to the outside of the shell body through the third welding part. The oil-gas separation space is formed between the shell, the shell body and the lower end cover. The second gas outlet pipe and the second liquid inlet pipe are welded to the side of the shell, and the liquid outlet pipe is welded to the bottom of the shell.

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