Integrated oil return device of refrigerating system

Abstract

The utility model discloses an integrated refrigerating system oil return device which comprises a compressor unit, an oil separator, an oil storage tank, an ejector, a gas-liquid separator and an oil collecting tank, the compressor unit is connected with the oil separator through a first connecting pipeline, the oil separator is communicated with the oil storage tank, the input end of the gas-liquid separator is connected with an evaporator, and the output end of the gas-liquid separator is communicated with the oil collecting tank. The gas-liquid separator is connected with the oil collecting tank, the oil collecting tank and the oil storage tank are connected with the compressor through the injection pipeline, and the injection pipeline is provided with the injector. According to the utility model, through the arrangement of the injection pipeline, high-pressure oil in the oil storage tank can drive low-pressure oil in the oil collection tank to be supplemented into the compressor unit from the injection pipeline through the ejector, so that on one hand, the oil storage quantity in the system can be reduced, on the other hand, accurate and rapid oil return can be realized, and the risk of oil shortage of a press is reduced; and safe oil return of the system can be realized.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration system equipment technology, and more specifically to an integrated refrigeration system oil return device. Background Technology

[0002] In existing technology, in refrigeration systems, the oil from each compressor is collected in a single oil tank by an oil separator, and then redistributed through the oil tank and oil level controller to solve the oil return problem of the compressor. However, if problems such as oil return failure of the gas-liquid separator or oil level control failure occur, some compressors may shut down due to low oil levels caused by the oil return problem, resulting in system fluctuations. Therefore, there is a problem with safe oil return. Utility Model Content

[0003] The technical problem to be solved by this invention is how to achieve safe oil return in the system.

[0004] This utility model solves the above-mentioned technical problems through the following technical means: an integrated refrigeration system oil return device, including a compressor unit, an oil separator, an oil storage tank, an ejector, a gas-liquid separator, and an oil collection tank. The compressor unit is connected to the oil separator through a first connecting pipeline. The oil separator is connected to the oil storage tank. The input end of the gas-liquid separator is connected to the evaporator. The gas-liquid separator is connected to the oil collection tank. The oil collection tank and the oil storage tank are connected to the compressor through an ejector pipeline. An ejector is provided on the ejector pipeline.

[0005] By setting up the ejector pipeline, the high-pressure oil in the oil storage tank can be driven by the ejector to carry the low-pressure oil in the oil collection tank into the compressor unit through the ejector pipeline. On the one hand, this can reduce the amount of oil stored in the system, and on the other hand, it can achieve precise and rapid oil return, reduce the risk of compressor oil shortage, and achieve safe oil return of the system.

[0006] As a preferred technical solution, the oil storage tank is connected to the oil return port of the compressor unit through a first oil return pipeline.

[0007] As a preferred technical solution, the compressor includes compressor one and compressor two connected in parallel.

[0008] As a preferred technical solution, an air balance pipe and an oil balance pipe are further provided between the compressor one and the compressor two. One end of the air balance pipe is connected to the compressor one and the other end is connected to the compressor two. One end of the oil balance pipe is connected to the compressor one and the other end is connected to the compressor two.

[0009] As a preferred technical solution, the output end of the gas-liquid separator is connected to the compressor unit through a second oil return pipeline.

[0010] As a preferred technical solution, the compressor unit is equipped with an oil level controller at the bottom.

[0011] As a preferred technical solution, the oil storage tank is equipped with a liquid level sensor one, and the oil collection tank is equipped with a liquid level sensor two.

[0012] As a preferred technical solution, the ejector pipeline includes a main pipeline and a first branch pipe and a second branch pipe connected in parallel. One end of the main pipeline is connected to the compressor, and the other end is connected to the first branch pipe and the second branch pipe connected in parallel. The main pipeline is connected to the oil storage tank through the first branch pipe, and the main pipeline is connected to the oil collection tank through the second branch pipe.

[0013] As a preferred technical solution, the first branch pipe is equipped with a solenoid valve one, and the second branch pipe is equipped with a solenoid valve two.

[0014] As a preferred technical solution, the gas-liquid separator is equipped with an anti-impact baffle, and the first connecting pipeline is equipped with a one-way valve.

[0015] The beneficial effects of this utility model are as follows:

[0016] (1) In this utility model, by setting the ejector pipe, the high-pressure oil in the oil storage tank can be driven by the ejector to bring the low-pressure oil in the oil collection tank into the compressor unit from the ejector pipe. On the one hand, it can reduce the amount of oil stored in the system, and on the other hand, it can achieve precise and fast oil return, reduce the risk of compressor oil shortage, and achieve safe oil return of the system.

[0017] (2) In this utility model, the oil level of the parallel compressors can be effectively balanced by setting the oil-gas balance pipe.

[0018] (3) In this utility model, the oil return through three types of oil return, namely oil-gas balance oil return, oil level controller oil return and ejector oil return, can greatly reduce the risk of compressor oil shortage and improve the reliability of compressor long-term operation. Attached Figure Description

[0019] Figure 1 A schematic diagram of the overall structure provided for an embodiment of this utility model;

[0020] Reference numerals: 1. Compressor 1; 2. Compressor 2; 3. Check Valve 1; 4. Check Valve 2; 5. Oil Separator; 6. Check Valve 3; 7. Oil Storage Tank; 8. Oil Level Controller 1; 9. Oil Level Controller 2; 10. Oil Balance Pipe; 11. Gas Balance Pipe; 12. Gas-Liquid Separator; 13. Liquid Level Sensor 1; 14. Solenoid Valve 1; 15. Solenoid Valve 2; 16. Liquid Level Sensor 2; 17. Ejector; 18. Oil Collection Tank; 19. Air Inlet; 20. Oil Return Port; 21. Exhaust Port; 22. Anti-impact Baffle. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] See Figure 1 An integrated refrigeration system oil return device includes a compressor unit, an oil separator 5, an oil storage tank 7, an ejector 17, a gas-liquid separator 12, and an oil collection tank 18. In this embodiment, the compressor unit includes a compressor 1 and a compressor 2 connected in parallel. The exhaust ports 21 of the compressor 1 and the compressor 2 are respectively connected to the oil separator 5 through a first connecting pipe. The oil separator 5 is connected to the input end of the oil storage tank 7 through a second connecting pipe. The gas-liquid separator 12 is located outside the compressor. The input end of the gas-liquid separator 12 is connected to the evaporator. One output end of the gas-liquid separator 12 is connected to the input end of the oil collection tank 18. The output end of the oil collection tank 18 and one output end of the oil storage tank 7 are connected to the compressor through an ejector pipe. An ejector 17 is provided on the ejector pipe.

[0023] By setting up the ejector pipeline, the high-pressure oil in the oil storage tank 7 can drive the low-pressure oil in the oil collection tank 18 to be replenished into the compressor unit through the ejector pipeline under the drive of the ejector 17. On the one hand, it can reduce the amount of oil stored in the system, and on the other hand, it can achieve precise and rapid oil return through the ejector pipeline and the ejector 17, reducing the risk of compressor oil shortage.

[0024] See Figure 1 Between compressor 1 and compressor 2, there is also an air balance pipe 11 and an oil balance pipe 10. One end of the air balance pipe 11 is connected to compressor 1 and the other end is connected to compressor 2. One end of the oil balance pipe 10 is connected to compressor 1 and the other end is connected to compressor 2. During operation or when either compressor is running, if the level of the refrigerant oil in the compressor oil sump is different due to slight differences in operating conditions, the level can be balanced through the air balance pipe 11 and the oil balance pipe 10.

[0025] See Figure 1The two first connecting pipes connected to compressor 1 and compressor 2 are connected in parallel, and are respectively equipped with one-way valve 3 and one-way valve 4. One-way valve 3 and one-way valve 4 are used to prevent refrigerant backflow after either compressor stops. The oil separator 5 outputs gas to the condenser through the gas supply pipe. One-way valve 6 is provided on the gas supply pipe. The other output end of the oil tank 7 is connected to the oil return port 20 of compressor 1 and compressor 2 through the first oil return pipe. The oil return port 20 of compressor 1 and compressor 2 is respectively equipped with oil level controller 8 and oil level controller 9. Oil level controller 8 and oil level controller 9 are located at the bottom of compressor 1 and compressor 2, respectively.

[0026] The two output ends of the gas-liquid separator 12 are connected to the suction ports 19 of compressor 1 and compressor 2 through the second return oil pipeline. The gas-liquid separator 12 is equipped with an anti-impact baffle 22. The gas-liquid separator 12 receives refrigerant from the evaporator and reduces its speed and changes its flow direction through the anti-impact baffle 22 to reduce the impact of uneven liquid levels in the gas-liquid separator 12 caused by airflow collision during operation. The oil storage tank 7 is equipped with a liquid level sensor 13. The oil storage tank 7 is used to collect oil from inside the oil separator 5. Part of the oil is supplied to the oil level controller 8 and oil level controller 9, and part of the oil is mixed with the oil in the oil collection tank 18 through the ejector 17 and then distributed to the parallel compressors, namely compressor 1 and compressor 2. The oil level controller 8, oil level controller 9, and oil separator 5 are all existing technologies. The oil level controller 8 and oil level controller 9 can be FOH-02 oil level controllers.

[0027] The oil collection tank 18 is equipped with a liquid level sensor 2 16. The oil collection tank 18 receives the refrigerant-containing refrigeration oil that fails to circulate back to the compressor from the bottom of the gas-liquid separator 12. The liquid level sensor 2 16 is used to monitor changes in oil level.

[0028] The ejector pipeline includes a main pipeline and a first branch pipe and a second branch pipe connected in parallel. One end of the main pipeline is connected to the compressor, and the other end is connected to the first branch pipe and the second branch pipe connected in parallel. The main pipeline is connected to the oil storage tank 7 through the first branch pipe, and the main pipeline is connected to the oil collection tank 18 through the second branch pipe. A solenoid valve 14 is installed on the first branch pipe, and a solenoid valve 25 is installed on the second branch pipe. Solenoid valves 14 and 25 are used to shut off the pipeline, thereby reducing unnecessary energy consumption. At the same time, when the liquid level sensor 216 detects that the upper limit has been reached, the ejector return oil system is opened, and when the lower limit has been reached, it is closed.

[0029] Working principle:

[0030] The mixture of refrigerant gas and oil discharged from compressor 1 and compressor 2 is collected in oil separator 5 for oil-gas separation, and refrigerant vapor enters the condenser through one-way valve 6.

[0031] When the oil level in the oil separator 5 reaches a certain height, the float ball in the oil separator 5 will open, continuously sending the oil in the oil separator 5 into the oil storage tank 7. When the oil level controller configured for compressor 1 and compressor 2 detects that the compressor is in a state of oil shortage, the solenoid valve built into the oil level controller 29 opens, and the oil in the oil storage tank 7 returns to the corresponding compressor.

[0032] When the oil level sensor, i.e., oil level controller 8 and / or oil level controller 9, detects that the liquid level in the oil collection tank 18 meets the requirements, the solenoid valve 14 and solenoid valve 25 open, and the low-pressure refrigeration oil in the oil collection tank 18 is mixed with the high-pressure refrigeration oil in the oil storage tank 7 through the ejector 17 and distributed to the corresponding compressor suction line, i.e., the exhaust port 21 of compressor 1 and compressor 2.

[0033] When the oil level control return oil fails, the oil level in the oil storage tank 7 will continue to rise. When it reaches the upper limit of the liquid level sensor in the oil storage tank 7, even if the value of the liquid level sensor 13 in the oil collection tank 18 has not reached the upper limit, the oil return will be ejected. The solenoid valve 14 and the solenoid valve 25 will open, and the refrigeration oil in the oil storage tank 7 will be replenished to the compressor refrigeration oil in time through the ejection circuit, so as to ensure the reliability of the oil return.

[0034] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An integrated refrigeration system oil return device, characterized in that, The system includes a compressor unit, an oil separator (5), an oil storage tank (7), an ejector (17), a gas-liquid separator (12), and an oil collection tank (18). The compressor unit is connected to the oil separator (5) through a first connecting pipeline. The oil separator (5) is connected to the oil storage tank (7). The input end of the gas-liquid separator (12) is connected to the evaporator. The gas-liquid separator (12) is connected to the oil collection tank (18). The oil collection tank (18) and the oil storage tank (7) are connected to the compressor through an ejector pipeline. An ejector (17) is provided on the ejector pipeline.

2. The integrated refrigeration system oil return device according to claim 1, characterized in that, The oil storage tank (7) is connected to the oil return port (20) of the compressor unit via the first oil return pipeline.

3. The integrated refrigeration system oil return device according to claim 1, characterized in that, The compressor includes compressor one (1) and compressor two (2) connected in parallel.

4. The integrated refrigeration system oil return device according to claim 3, characterized in that, A gas balance pipe (11) and an oil balance pipe (10) are provided between the compressor one (1) and the compressor two (2). One end of the gas balance pipe (11) is connected to the compressor one (1) and the other end is connected to the compressor two (2). One end of the oil balance pipe (10) is connected to the compressor one (1) and the other end is connected to the compressor two (2).

5. The integrated refrigeration system oil return device according to claim 1, characterized in that, The output end of the gas-liquid separator (12) is connected to the compressor unit through the second oil return pipeline.

6. The integrated refrigeration system oil return device according to claim 2, characterized in that, An oil level controller is installed at the bottom of the compressor unit.

7. The integrated refrigeration system oil return device according to claim 1, characterized in that, The oil storage tank (7) is equipped with a liquid level sensor (13), and the oil collection tank (18) is equipped with a liquid level sensor (16).

8. The integrated refrigeration system oil return device according to claim 1, characterized in that, The ejector pipeline includes a main pipeline and a first branch pipe and a second branch pipe connected in parallel. One end of the main pipeline is connected to the compressor, and the other end is connected to the first branch pipe and the second branch pipe connected in parallel. The main pipeline is connected to the oil storage tank (7) through the first branch pipe, and the main pipeline is connected to the oil collection tank (18) through the second branch pipe.

9. An integrated refrigeration system oil return device according to claim 8, characterized in that, The first branch pipe is equipped with a solenoid valve one (14), and the second branch pipe is equipped with a solenoid valve two (15).

10. An integrated refrigeration system oil return device according to claim 3, characterized in that, The gas-liquid separator (12) is equipped with an anti-impact baffle (22), and a one-way valve is provided on the first connecting pipeline.

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