Refrigerator car refrigerating unit with pressure balancing device and refrigerator car

Abstract

The utility model provides a refrigerator car refrigerating unit with a pressure balancing device and a refrigerator car, which comprise a compressor, an oil separator, a condenser and an evaporator which are sequentially communicated through pipelines and form a refrigerating loop, and the high-pressure liquid outlet end of the oil separator is communicated with the low-pressure liquid return end of the compressor through a communicating branch pipeline. And an electromagnetic valve is arranged on the communicating branch pipeline. According to the refrigerator car refrigerating unit with the pressure balancing device, rapid balance of high pressure and low pressure of a refrigerating system is achieved through the simple structure and steps, and the compressor can be started at any time without faults.

Description

Technical Field

[0001] The utility model relates to the field of refrigeration units for refrigerated vehicles, and in particular to a refrigeration unit for refrigerated vehicles with a pressure balancing device and a refrigerated vehicle. Background Art

[0002] A refrigerated truck is a special closed transport vehicle equipped with a refrigeration unit. It is often used to transport frozen and refrigerated goods, including some goods that require relatively precise temperature inside the refrigerated box. Refrigeration units that require relatively precise temperature control inside the box require the compressor to be started and stopped frequently. After the compressor stops, the refrigeration system pressure must meet the conditions before the compressor can be restarted. After the compressor of a traditional refrigerated truck refrigeration unit stops, the system naturally balances, which takes a long time. The conditions for the compressor to restart may not be met in a short period of time, and other methods of balancing the pressure are not simple and convenient enough. If the compressor cannot be started and stopped frequently, the temperature inside the refrigerated box cannot be accurately controlled, which is a very severe test for goods with strict transportation temperature requirements.

[0003] The invention patent application with application publication number CN117341413A discloses a vehicle thermal management system, method, device, medium and vehicle. The vehicle thermal management system includes a refrigerant circulation loop and a coolant circulation loop; the refrigerant circulation loop includes a refrigerant circulation device and an energy storage coolant tank; the refrigerant circulation device includes at least one radiator; the energy storage coolant tank includes a storage cavity for storing coolant; the radiator is located in the storage cavity of the energy storage coolant tank; the energy storage coolant tank is a device for storing the cold or heat released by the radiator; the energy storage coolant tank is connected to the coolant circulation loop; the coolant circulation loop includes at least one target heat exchanger. The system does not need to keep the refrigerant circulation loop started and running in real time, and can control the start or stop of the refrigerant circulation loop according to the actual thermal management requirements, and determine the conduction loop of the coolant circulation loop, which can allocate and manage the thermal requirements of the whole vehicle in a more refined manner, and effectively expand the control method of the vehicle's thermal management. However, the control steps of the system are cumbersome and the structure is complex. Utility Model Content

[0004] In order to achieve rapid balance of high and low pressures in a refrigeration system through a simple structure and steps, so that the compressor can be started at any time without malfunction, the technical solution adopted by the utility model is: a refrigeration unit for a refrigerated truck with a pressure balancing device, comprising a compressor, an oil separator, a condenser and an evaporator which are sequentially connected through pipelines to form a refrigeration circuit, the high-pressure liquid outlet end of the oil separator is connected to the low-pressure liquid return end of the compressor through a connecting branch pipeline, and a solenoid valve is arranged on the connecting branch pipeline.

[0005] Based on the above, in order to facilitate distinction, the low-pressure liquid return end of the compressor is connected to the liquid outlet end of the evaporator through a low-pressure pipeline, the liquid inlet end of the oil separator is connected to the high-pressure liquid outlet end of the compressor through a first high-pressure pipeline, and the high-pressure liquid outlet end of the oil separator is connected to the condenser through a second high-pressure pipeline; the connecting branch pipeline is connected between the low-pressure pipeline and the second high-pressure pipeline.

[0006] Based on the above, in order to separate the lubricating oil, an oil separator liquid return pipeline is connected between the low-pressure pipeline and the liquid return end of the oil separator.

[0007] Based on the above, a stop valve is provided on the second high-pressure pipeline.

[0008] Based on the above, in order to realize dry liquid storage, the condenser and the evaporator are connected through a condenser liquid outlet pipeline, and a dry liquid storage device and an expansion valve are provided on the condenser liquid outlet pipeline.

[0009] Based on the above, in order to realize the defrost function of the refrigeration unit, a defrost pipeline is connected between the second high-pressure pipeline and the condenser liquid outlet pipeline, and a defrost valve is arranged on the defrost pipeline.

[0010] Based on the above, a connecting branch pipeline interface, a defrost pipeline interface and the stop valve are sequentially arranged along the fluid flow direction of the second high-pressure pipeline.

[0011] The utility model also provides a refrigerated vehicle, which is equipped with the refrigerated vehicle refrigeration unit with the pressure balancing device.

[0012] The utility model has substantial characteristics and progress compared with the prior art. Specifically, the refrigeration unit of a refrigerated truck with a pressure balancing device provided by the utility model is in a normal open state by setting a connecting branch pipeline and a solenoid valve between the high-pressure pipeline after the oil separator and the low-pressure pipeline of the compressor. When the unit reaches the preset value, after the compressor stops working, the unit energizes the solenoid valve coil and closes the valve body, so that the high-pressure pipeline is connected to the low-pressure pipeline, so that the refrigerant in the high-pressure pipeline can flow quickly to the low-pressure pipeline, so that the pressure in the high-pressure and low-pressure pipelines can quickly reach balance. It is ensured that the pressure in the high-pressure and low-pressure pipelines will be automatically balanced every time the compressor stops working, so the compressor can be started again at any time, thereby effectively avoiding the problem of the compressor being unable to start and stop normally and frequently due to pressure imbalance. At the same time, it also improves the accuracy of controlling the temperature in the refrigerator, ensures the quality of transporting special goods, reduces the damage rate of goods, and reduces transportation costs.

[0013] Therefore, the refrigeration unit of the refrigerated truck with the pressure balancing device provided by the utility model realizes the rapid balance of high and low pressures of the refrigeration system through simple structure and steps, so that the compressor can be started at any time without failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a schematic diagram of the structure of a refrigeration unit of a refrigerated truck with a pressure balancing device.

[0015] In the figure: 1. compressor; 2. condenser liquid outlet pipeline; 3. connecting branch pipeline; 4. oil separator liquid return pipeline; 5. first high-pressure pipeline; 6. low-pressure pipeline; 7. evaporator; 8. oil separator; 9. defrost pipeline; 10. second high-pressure pipeline; 11. solenoid valve; 12. expansion valve; 13. stop valve; 14. condenser; 15. dry liquid storage tank; 16. defrost valve. DETAILED DESCRIPTION

[0016] The technical solution of the utility model is further described in detail below through specific implementation methods.

[0017] Example 1

[0018] This embodiment provides a refrigeration unit for a refrigerated truck with a pressure balancing device, such as Figure 1 As shown, it includes a compressor 1, an oil separator 8, a condenser 14 and an evaporator 7 which are connected in sequence through pipelines to form a refrigeration circuit. The high-pressure liquid outlet end of the oil separator 8 is connected to the low-pressure liquid return end of the compressor 1 through a connecting branch pipeline 3, and a solenoid valve 11 is provided on the connecting branch pipeline 3.

[0019] Specifically, in this embodiment, for the convenience of distinction, the low-pressure liquid return end of the compressor 1 is connected to the liquid outlet end of the evaporator 7 through the low-pressure pipeline 6. The liquid inlet end of the oil separator 8 is connected to the high-pressure liquid outlet end of the compressor 1 through the first high-pressure pipeline 5. The high-pressure liquid outlet end of the oil separator 8 is connected to the condenser 14 through the second high-pressure pipeline 10. The connecting branch pipeline 3 is connected between the low-pressure pipeline 6 and the second high-pressure pipeline 10.

[0020] In order to separate the lubricating oil, an oil separator liquid return pipeline 4 is connected between the low-pressure pipeline 6 and the liquid return end of the oil separator 8. A stop valve 13 is provided on the second high-pressure pipeline 10.

[0021] In order to realize dry liquid storage, the condenser 14 is connected to the evaporator 7 through the condenser liquid outlet pipeline 2, and the condenser liquid outlet pipeline 2 is provided with a dry liquid storage device 15 and an expansion valve 12.

[0022] In order to realize the defrosting function of the refrigeration unit, a defrost pipeline 9 is connected between the second high-pressure pipeline 10 and the condenser liquid outlet pipeline 2, and a defrost valve 16 is arranged on the defrost pipeline 9. A connecting branch pipeline interface, a defrost pipeline interface and the stop valve are arranged on the second high-pressure pipeline 10 in sequence along the fluid flow direction.

[0023] Specifically, in this embodiment, one end of the oil separator liquid return pipeline and one end of the connecting branch pipeline are sequentially connected to the low-pressure pipeline along the fluid flow direction in the low-pressure pipeline.

[0024] In this embodiment, the dry liquid storage device, the expansion valve and one end of the defrost pipeline are sequentially connected to the condenser liquid outlet pipeline along the fluid flow direction in the condenser liquid outlet pipeline.

[0025] Specifically, the oil separator in this embodiment adopts a general oil separator of existing structure. The working principle of the oil separator is that the high-pressure gas from the compressor, containing gaseous working fluid and lubricating oil, enters the oil separator, passes through the guide vanes of the oil separator, flows along the guide vanes in a spiral shape, and relies on centrifugal force and gravity to separate the lubricating oil from the working fluid gas and flow down along the inner wall of the cylinder. The working fluid gas is led out of the oil separator through the porous baffle and the central pipe. The separated lubricating oil is concentrated in the lower part of the oil separator and can be discharged regularly, or a float valve can be used to automatically return the lubricating oil to the crankcase of the compressor.

[0026] Example 2

[0027] This embodiment provides a refrigerated truck, which is equipped with the refrigerated truck refrigeration unit with a pressure balancing device as described in Embodiment 1.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.

Claims

1. A refrigeration unit for a refrigerated truck with a pressure balancing device, comprising a compressor, an oil separator, a condenser and an evaporator which are sequentially connected through pipelines to form a refrigeration circuit, characterized in that: The high-pressure liquid outlet end of the oil separator is connected to the low-pressure liquid return end of the compressor through a connecting branch pipeline, and a solenoid valve is arranged on the connecting branch pipeline.

2. The refrigeration unit for a refrigerated vehicle with a pressure balancing device according to claim 1, characterized in that: The low-pressure liquid return end of the compressor is connected to the liquid outlet end of the evaporator through a low-pressure pipeline, the liquid inlet end of the oil separator is connected to the high-pressure liquid outlet end of the compressor through a first high-pressure pipeline, and the high-pressure liquid outlet end of the oil separator is connected to the condenser through a second high-pressure pipeline; The connecting branch pipeline is connected between the low-pressure pipeline and the second high-pressure pipeline.

3. The refrigeration unit for a refrigerated vehicle with a pressure balancing device according to claim 2, characterized in that: An oil separator liquid return pipeline is connected between the low-pressure pipeline and the liquid return end of the oil separator.

4. The refrigeration unit for a refrigerated vehicle with a pressure balancing device according to claim 2 or 3, characterized in that: The second high-pressure pipeline is provided with a stop valve.

5. The refrigeration unit for a refrigerated vehicle with a pressure balancing device according to claim 4, characterized in that: The condenser is connected to the evaporator through a condenser liquid outlet pipeline, and a dry liquid storage device and an expansion valve are arranged on the condenser liquid outlet pipeline.

6. The refrigeration unit for a refrigerated vehicle with a pressure balancing device according to claim 5, characterized in that: A defrost pipeline is connected between the second high-pressure pipeline and the condenser liquid outlet pipeline, and a defrost valve is arranged on the defrost pipeline.

7. The refrigeration unit for a refrigerated vehicle with a pressure balancing device according to claim 6, characterized in that: The second high-pressure pipeline is provided with a connecting branch pipeline interface, a defrost pipeline interface and the stop valve in sequence along the fluid flow direction.

8. A refrigerated vehicle, characterized in that: The refrigerated truck is equipped with a refrigerated truck refrigeration unit with a pressure balancing device as described in any one of claims 1 to 7.

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