A compressor refrigeration system rapid oil return device and a refrigeration system

Abstract

The utility model discloses a kind of compressor refrigeration system quick oil return device and refrigeration system, including compressor, gas-liquid separation tank, still including oil temporary storage tank;The liquid outlet of gas-liquid separation tank is communicated with oil temporary storage tank by liquid outlet pipeline;Oil temporary storage tank is communicated with the suction port of compressor by oil return pipeline;Oil temporary storage tank and compressor outlet are communicated by power line;First control assembly is set on the power line, second control assembly is set on the liquid outlet pipeline.The utility model increases the process of temporary storage tank flow, power line by in compressor refrigeration system, realize the quick backflow of lubricating oil in pipeline, avoid screw compressor long-term low oil level operation, ensure that compressor normal operation.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration equipment technology, specifically to a rapid oil return device and refrigeration system for a compressor refrigeration system. Background Technology

[0002] Condensation is one of the most commonly used processes in the field of oil and gas recovery. It involves multi-stage condensation to condense gaseous VOCs into liquid for recovery. The key to this process is the screw compressor refrigeration process, which uses a compressor to compress the refrigerant and then throttles it through an expansion valve. In this process, the refrigerant plays a role in phase change and heat transfer. The lubricating oil cools and seals the screw compressor. The refrigerant carries the lubricating oil in continuous movement, and the oil level in the compressor cavity remains balanced.

[0003] In actual operation, although most of the lubricating oil returns to the compressor thanks to the oil separator, the movement of the lubricating oil becomes increasingly insignificant as the refrigerant velocity decreases. When the gas flow velocity at the compressor suction level drops to its minimum, the gas flow cannot completely carry the lubricating oil back to the compressor. This results in a small amount of lubricating refrigerant leaving the compressor without completing its return flow, leaving lubricating oil residue in the gas-liquid separator. This causes the compressor oil level to continuously decrease. At this point, the lubricating oil cannot perform its lubrication, sealing, and heat dissipation functions, thus exacerbating the wear and tear and jamming of mechanical parts. This can easily prevent the cooling temperature from reaching the preset temperature, and in severe cases, can even cause overload and damage to the motor and other equipment.

[0004] Announcement No. CN220103441U discloses a screw chiller unit, including a connected screw compressor, an oil separator, an evaporative condenser, and a shell-and-tube heat exchanger. The shell-and-tube heat exchanger delivers chilled water by exchanging heat with a refrigerant. The screw chiller unit also includes a second heat exchanger for cooling lubricating oil. One side of the second heat exchanger is connected to the oil separator and the screw compressor, and the other side of the second heat exchanger is connected to a water tank for supplying domestic hot water to users.

[0005] During use, this existing technology results in residual lubricating oil in the gas-liquid separator, causing the compressor oil level to continuously decrease.

[0006] Publication No. CN117537511A discloses a compressor oil return system, method, and refrigeration equipment, including an oil separator connected to the compressor via an oil return pipeline, an oil return control valve, a vibration detection sensor for detecting compressor vibration, and a noise detection sensor for detecting compressor noise. The oil return control valve controls the oil return amount according to the compressor's vibration and noise conditions.

[0007] During use, this existing technology results in residual lubricating oil in the gas-liquid separator, causing the compressor oil level to continuously decrease.

[0008] Announcement No. CN222811962U discloses an air conditioner, including a refrigeration system composed of a compressor, a first heat exchanger, a second heat exchanger, and a throttling device, and an oil separator; the oil separator is located between the compressor and the first heat exchanger, and includes an air inlet, an air outlet, and an oil outlet; the air inlet is connected to the exhaust port of the compressor; the air outlet is connected to one end of the first heat exchanger; the compressor has a variable load; the air conditioner also includes a first oil return pipeline and a second solenoid valve; the first oil return pipeline includes a first solenoid valve and a first capillary tube connected in series, with its two ends connected to the oil outlet and the compressor's suction port respectively, for connecting the oil return under high load; the two ends of the second solenoid valve are connected to the oil outlet and the air outlet respectively, for connecting the lubricating oil back to the refrigeration system for circulation under low load.

[0009] In this existing technology, the high-temperature, high-pressure gaseous refrigerant will circulate back to the suction port of the screw compressor. It needs to be depressurized and cooled through a capillary tube. However, the capillary tube will increase the oil return resistance, making it impossible to achieve rapid oil return.

[0010] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of this utility model. For more technical features, technical problems to be solved, and beneficial effects of this utility model, the above-disclosed technical documents do not provide any technical inspiration. Utility Model Content

[0011] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, this utility model provides a rapid oil return device for a compressor refrigeration system and a refrigeration system.

[0012] To achieve the above objectives, the present invention adopts the following technical solution:

[0013] On one hand, this utility model provides a rapid oil return device for a compressor refrigeration system, including a compressor, a gas-liquid separator, and an oil storage tank; the liquid outlet of the gas-liquid separator is connected to the oil storage tank through a liquid outlet pipeline; the oil storage tank is connected to the compressor suction port through an oil return pipeline; the oil storage tank is connected to the compressor outlet through an auxiliary pipeline; a first control component is provided on the auxiliary pipeline, and a second control component is provided on the liquid outlet pipeline.

[0014] Furthermore, the first control component includes a check valve and a first solenoid valve, and the second control component includes a second solenoid valve.

[0015] Furthermore, the first control component also includes a first maintenance ball valve, the second control component also includes a second maintenance ball valve, and a third maintenance ball valve is provided on the return oil line.

[0016] Furthermore, the gas-liquid separator is located above the oil storage tank;

[0017] Specifically, the return oil line is connected to the bottom of the oil storage tank, the assist line is connected to the top of the oil storage tank, and a level transmitter is installed inside the oil storage tank.

[0018] Furthermore, the oil storage tank is equipped with a transparent viewing window, and the lower end of the oil storage tank is tapered. The return oil pipeline is connected to the bottom of the tapered lower end of the oil storage tank.

[0019] Secondly, this utility model provides a refrigeration system, including a heat exchange component, and also includes a compressor refrigeration system rapid oil return device as described in one aspect; the compressor outlet is provided with a first outlet pipeline, the auxiliary pipeline is connected to the first outlet pipeline, the first outlet pipeline is connected to the air inlet of the gas-liquid separator with a heat exchange component, and the air outlet of the gas-liquid separator is connected to the air inlet of the compressor through a return gas pipeline.

[0020] Furthermore, the heat exchange assembly includes a condenser, an expansion valve, and an evaporator arranged in sequence;

[0021] Specifically, the inlet of the condenser is connected to the first outlet pipeline, the outlet of the condenser is connected to the inlet of the expansion valve through the first process pipeline, the outlet of the expansion valve is connected to the inlet of the evaporator through the second process pipeline, and the outlet of the evaporator is connected to the inlet of the gas-liquid separator through the third process pipeline.

[0022] Furthermore, the shell of the evaporator is a shell-and-tube heat exchanger, the tube side of the shell-and-tube heat exchanger is connected to the second process pipeline and the third process pipeline, the heat exchange inlet of the shell side of the shell-and-tube heat exchanger is connected to the heat exchange inlet pipeline, and the heat exchange outlet of the shell side of the shell-and-tube heat exchanger is connected to the heat exchange outlet pipeline.

[0023] Furthermore, a safety valve is installed at the end of the first outlet pipeline near the compressor, and a fourth maintenance valve is installed on the return gas pipeline.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. This utility model achieves rapid return of lubricating oil in the pipeline by adding a bypass temporary storage tank process and auxiliary pipeline to the compressor refrigeration system, thereby avoiding long-term low oil level operation of the compressor and ensuring normal operation of the compressor.

[0026] 2. The power source of this utility model is the high-pressure gas at the compressor outlet. By opening the first solenoid valve, the high-pressure gas enters the oil storage tank and returns to the compressor suction side. The high-speed airflow carries the lubricating oil in the oil storage tank into the compressor cavity. Then the first solenoid valve closes, completing the rapid oil replenishment process. Furthermore, the high-temperature gaseous refrigerant will not circulate into the compressor.

[0027] 3. This utility model has a simple structure and can be modified according to the design load of different compressors. The opening state of the solenoid valve is interlocked with the oil level in the compressor cavity to realize rapid automatic oil return when the low oil level alarm occurs.

[0028] 4. The oil storage tank of this utility model is equipped with maintenance valves on the inlet and outlet pipelines, which can prevent the medium in the pipeline from being completely emptied during maintenance, effectively reducing the amount of maintenance work.

[0029] 5. This utility model is mainly used in the screw compressor refrigeration process of the condenser skid of the oil and gas recovery device. By adding a temporary storage tank bypass process to the screw compressor refrigeration system, the lubricating refrigerant can be fully returned to the compressor cavity, the oil level in the compressor cavity is kept balanced, the compressor is fully lubricated, the equipment refrigeration efficiency is improved, the equipment life is extended, the frequency of equipment failure caused by poor oil return is reduced, the maintenance frequency is reduced, the overall operating efficiency of the system is further improved, and the long-term stable operation of the system is ensured. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a rapid oil return device for a compressor refrigeration system according to this utility model.

[0031] In the diagram: 1. Compressor; 2. First outlet pipeline; 3. Safety valve; 4. Power assist pipeline; 5. Check valve; 6. First maintenance ball valve; 7. First solenoid valve; 8. Oil storage tank; 9. Oil return pipeline; 10. Third maintenance ball valve; 11. Second process pipeline; 12. Expansion valve; 13. Evaporator; 14. Third process pipeline; 15. Gas-liquid separator; 16. Liquid outlet pipeline; 17. Second maintenance ball valve; 18. Second solenoid valve; 19. Heat exchanger inlet pipeline; 20. Heat exchanger outlet pipeline; 21. Gas return pipeline; 22. Fourth maintenance valve; 23. Condenser. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Example 1:

[0034] Please see Figure 1 This utility model provides a rapid oil return device for a compressor refrigeration system, including a compressor 1 and a gas-liquid separator 15. The outlet of the gas-liquid separator 15 is connected to an oil storage tank 8 via an outlet pipeline 16. The oil storage tank 8 is connected to the suction port of the compressor 1 via an oil return pipeline 9. The oil storage tank 8 is connected to the outlet of the compressor 1 via an auxiliary pipeline 4. A first control component is installed on the auxiliary pipeline 4, and a second control component is installed on the outlet pipeline 16. The lubricating oil separated from the gas-liquid separator 15 flows into the oil storage tank 8 and then flows to the suction port of the compressor 1. When the lubricating oil level in the compressor 1 is low, the auxiliary pipeline 4 is opened by the first control component, and the outlet pipeline 16 is closed by the second control component. The high-temperature and high-pressure gas discharged from the compressor 1 forces the lubricating oil into the suction port of the compressor 1. By timing or level detection, the first control component closes the auxiliary pipeline 4, and the second control component opens the outlet pipeline 16, thereby achieving rapid oil return.

[0035] Preferably, the compressor is a screw compressor.

[0036] Specifically, the first control component includes a check valve 5, a first maintenance ball valve 6, and a first solenoid valve 7; the check valve prevents lubricating oil from flowing back from the oil storage tank 8, which could lead to oil leakage between high and low pressure; the first solenoid valve 7 automatically controls the opening and closing of the power supply line 4.

[0037] Specifically, the second control component includes a second maintenance ball valve 17 and a second solenoid valve 18, through which the opening and closing of the liquid outlet pipeline 16 is automatically controlled.

[0038] Specifically, a third maintenance ball valve 10 is installed on the return oil line 9.

[0039] Among them, the first maintenance ball valve 6, the second maintenance ball valve 17, and the third maintenance ball valve 10 are used to manually shut off the pipeline during maintenance to prevent the medium in the pipeline from being completely vented, thus effectively reducing the workload of maintenance.

[0040] Furthermore, the gas-liquid separator 15 is located above the oil storage tank 8. The lubricating oil at the bottom of the gas-liquid separator 15 is discharged into the oil storage tank 8 by gravity. The oil return line 9 is connected to the bottom of the oil storage tank 8, and the auxiliary line 4 is connected to the top of the oil storage tank 8 to avoid dead oil that cannot return to the compressor 1. A level transmitter is installed in the oil storage tank 8 to facilitate the monitoring of the real-time liquid level in the tank and to facilitate automated control.

[0041] Preferably, the oil storage tank 8 is a copper storage tank with a transparent viewing window in the middle. The lower end of the oil storage tank 8 is constricted, such as a cone or sphere. The oil return line 9 is connected to the constricted bottom of the lower end of the oil storage tank 8, so that the lubricating oil can quickly enter the oil return line 9.

[0042] Example 2:

[0043] Based on Example 1, this example provides a refrigeration system.

[0044] The compressor 1 is provided with a first outlet pipeline 2, the auxiliary pipeline 4 is connected to the first outlet pipeline 2, the first outlet pipeline 2 is connected to the air inlet of the gas-liquid separator 15 with a heat exchange component, and the air outlet of the gas-liquid separator 15 is connected to the air inlet of the compressor 1 through the return gas pipeline 21.

[0045] Specifically, the heat exchange assembly includes a condenser 23, an expansion valve 12, and an evaporator 13 arranged in sequence. The inlet of the condenser 23 is connected to the first outlet pipeline 2, the outlet of the condenser 23 is connected to the inlet of the expansion valve 12 through a first process pipeline, the outlet of the expansion valve 12 is connected to the inlet of the evaporator 13 through a second process pipeline 11, and the outlet of the evaporator 13 is connected to the inlet of the gas-liquid separator 15 through a third process pipeline 14.

[0046] In this embodiment, the shell of the evaporator 13 is a shell-and-tube heat exchanger. The tube side of the shell-and-tube heat exchanger is connected to the second process line 11 and the third process line 14. The heat exchange inlet of the shell side of the shell-and-tube heat exchanger is connected to the heat exchange inlet line 19, and the heat exchange outlet of the shell side of the shell-and-tube heat exchanger is connected to the heat exchange outlet line 20. The process is connected to the VOCs gas recovery equipment through the heat exchange inlet line 19 and the heat exchange outlet line 20 for condensation recovery.

[0047] Specifically, the condenser 23 is equipped with a fan to improve heat dissipation efficiency.

[0048] Specifically, a safety valve 3 is installed at the end of the first outlet pipeline 2 near the compressor 1.

[0049] Specifically, a fourth maintenance valve 22 is installed on the return gas pipeline 21.

[0050] In this embodiment, during operation: the compressor 1 increases the pressure and temperature of the refrigerant, changing it from a gaseous state to a high-temperature, high-pressure gaseous state; the condenser 23 releases heat, causing the refrigerant to liquefy from a gaseous state into a high-temperature, high-pressure liquid refrigerant; the expansion valve 12 throttles and reduces the pressure, causing the refrigerant to become a low-temperature, low-pressure liquid; the heat exchange medium flows through the shell side of the evaporator 13, and the refrigerant flows through the tube side of the evaporator 13. The heat from the heat exchange medium is absorbed by the refrigerant, and the refrigerant changes from a liquid state to a gaseous state and enters the gas-liquid separator 15; the lubricating oil and the gaseous refrigerant are separated in the gas-liquid separator 15, the lubricating oil enters the oil storage tank 8, and the gaseous refrigerant enters the compressor 1 for repeated circulation; the lubricating oil slowly enters the compressor 1 from the storage tank 8. When the lubricating oil level in the compressor 1 is low, the high pressure at the outlet of the compressor 1 drives the lubricating oil in the oil storage tank 8, allowing it to quickly return to the compressor cavity.

[0051] Example 3:

[0052] Based on Example 2, this example provides an automated oil return method for a refrigeration system.

[0053] The liquid outlet line 16 is equipped with a second solenoid valve 18, and the booster line 4 is equipped with a first solenoid valve 6. The on / off states of the first solenoid valve 6 and the second solenoid valve 18 are interlocked with the oil level in the oil tank of the compressor 1.

[0054] When the compressor 1 is operating normally and the oil level is normal, the lubricating oil collected in the gas-liquid separator 15 enters the oil storage tank 8 under the action of gravity, and enters the compressor 1 for recycling under the action of gravity and return gas pipeline 21. At this time, the second solenoid valve 18 opens and the first solenoid valve 6 closes.

[0055] When the oil return of compressor 1 is obstructed, resulting in a low oil level, the second solenoid valve 18 closes and the first solenoid valve 6 opens. High-pressure gas enters the oil storage tank 8, and the high-speed airflow carries the lubricating oil in the oil storage tank 8 into the compressor cavity, completing the rapid oil replenishment process. When the oil level of compressor 1 returns to the normal value, or the liquid in the oil storage tank 8 is nearly emptied, the first solenoid valve 6 is disconnected and the second solenoid valve 18 is opened. The lubricating oil in the gas-liquid separator 15 returns to the oil storage tank 8 under gravity, and the oil return process of compressor 1 returns to normal, preventing high-pressure gas from circulating into compressor 1.

[0056] It should be noted that the compressor 1, condenser 23, expansion valve 12, evaporator 13, gas-liquid separator, and various valve bodies are all existing technologies, and those skilled in the art are aware of their structure.

[0057] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0058] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0059] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0060] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0061] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A rapid oil return device for a compressor refrigeration system, comprising a compressor and a gas-liquid separator, characterized in that, It also includes oil storage tanks; The outlet of the gas-liquid separator is connected to the oil storage tank via an outlet pipeline; the oil storage tank is connected to the compressor intake via an oil return pipeline; and the oil storage tank is connected to the compressor outlet via an auxiliary pipeline. A first control component is installed on the assist pipeline, and a second control component is installed on the liquid outlet pipeline.

2. The rapid oil return device for a compressor refrigeration system according to claim 1, characterized in that, The first control component includes a check valve and a first solenoid valve, and the second control component includes a second solenoid valve.

3. The rapid oil return device for a compressor refrigeration system according to claim 2, characterized in that, The first control component further includes a first maintenance ball valve, the second control component further includes a second maintenance ball valve, and a third maintenance ball valve is provided on the return oil line.

4. A rapid oil return device for a compressor refrigeration system according to claim 2, characterized in that, The gas-liquid separator is located above the oil storage tank; The return oil line is connected to the bottom of the oil storage tank, the assist line is connected to the top of the oil storage tank, and a level transmitter is installed inside the oil storage tank.

5. A rapid oil return device for a compressor refrigeration system according to claim 4, characterized in that, The oil storage tank is equipped with a transparent viewing window, and the lower end of the oil storage tank is tapered. The oil return pipeline is connected to the bottom of the tapered lower end of the oil storage tank.

6. A refrigeration system, comprising a heat exchange component, characterized in that, It also includes a rapid oil return device for a compressor refrigeration system as described in claim 4; The compressor outlet is provided with a first outlet pipeline, the auxiliary pipeline is connected to the first outlet pipeline, the first outlet pipeline is connected to the air inlet of the gas-liquid separator with a heat exchange component, and the air outlet of the gas-liquid separator is connected to the air inlet of the compressor through a return gas pipeline.

7. A refrigeration system according to claim 6, characterized in that, The heat exchange assembly includes a condenser, an expansion valve, and an evaporator arranged in sequence. The inlet of the condenser is connected to the first outlet pipeline, the outlet of the condenser is connected to the inlet of the expansion valve through the first process pipeline, the outlet of the expansion valve is connected to the inlet of the evaporator through the second process pipeline, and the outlet of the evaporator is connected to the inlet of the gas-liquid separator through the third process pipeline.

8. A refrigeration system according to claim 7, characterized in that, The shell of the evaporator is a shell-and-tube heat exchanger. The tube side of the shell-and-tube heat exchanger is connected to the second process pipeline and the third process pipeline. The heat exchange inlet of the shell side of the shell-and-tube heat exchanger is connected to the heat exchange inlet pipeline, and the heat exchange outlet of the shell side of the shell-and-tube heat exchanger is connected to the heat exchange outlet pipeline.

9. A refrigeration system according to claim 6, characterized in that, A safety valve is installed at the end of the first outlet pipeline near the compressor, and a fourth maintenance valve is installed on the return gas pipeline.

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