CN215176232U - Refrigerating unit vacuum pumping system for transport refrigeration - Google Patents
Refrigerating unit vacuum pumping system for transport refrigeration Download PDFInfo
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- CN215176232U CN215176232U CN202120542396.8U CN202120542396U CN215176232U CN 215176232 U CN215176232 U CN 215176232U CN 202120542396 U CN202120542396 U CN 202120542396U CN 215176232 U CN215176232 U CN 215176232U
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Abstract
The utility model provides a refrigerating unit vacuum pumping system for transport refrigeration, which comprises a compressor, a vacuum pump, a condenser, an evaporator, a liquid storage tank, a pressure measuring device and a heat exchanger; the vacuum pump is communicated with the pressure measuring device through a connecting hose; the low-pressure end of the compressor is communicated with the evaporator through a first pipeline; the high-pressure end of the compressor is communicated with the condenser through a third pipeline, and a main stop valve and a first one-way valve are arranged on the third pipeline; the condenser is communicated with the liquid storage tank through a seventh pipeline; the evaporator is communicated with the condenser through a fifth pipeline, the outlet of the liquid storage tank is communicated with the fifth pipeline through a sixth pipeline, and the fifth pipeline is provided with an expansion valve and a first stop valve; the low-pressure interface of the pressure measuring device is communicated with the low-pressure end of the compressor through a low-pressure hose; the high-pressure interface of the pressure measuring device is communicated with the outlet end of the liquid storage tank through a high-pressure hose. The system can improve the maintenance efficiency, reduce the discharge amount of the refrigerant and reduce the environmental pollution.
Description
Technical Field
The utility model relates to a transportation refrigeration plant field, specific theory has related to a refrigerating unit evacuation system for transportation refrigeration.
Background
Evacuation is an important process in the production, installation or maintenance of a refrigeration unit. The specific expression is the process of connecting the vacuum pump with the refrigerating unit and exhausting the non-condensable gas and water in the refrigerating system out of the system. In the production, installation or maintenance process of the refrigerating unit, some moisture and non-condensable gas can be remained in the pipeline, if the moisture and the non-condensable gas are not discharged in time, the phenomenon of pipeline corrosion or ice blockage can be generated along with the operation of the refrigerating unit, the service life of the refrigerating unit can be greatly shortened, and the maintenance cost is increased.
At present, the vacuumizing method of a refrigerating unit for refrigeration generally adopts a simpler method, for example, a magnet is used for opening a defrosting valve and a stop valve, a pressure gauge is connected with a needle valve at the suction and exhaust port of a compressor in the refrigerating unit, a vacuum pump is connected, and finally the vacuum pump is started for vacuumizing, or a multi-vacuum-pump parallel multi-section simultaneous vacuumizing mode is adopted for discharging moisture and non-condensable gas in a pipeline, so that the aim of vacuumizing the refrigerating unit is fulfilled. However, during maintenance of the unit, the refrigerant must be discharged each time, which requires evacuation of the lines each time and refilling with refrigerant each time, which results in inefficiency and waste of resources.
In order to solve the above problems, people are always seeking an ideal technical solution.
SUMMERY OF THE UTILITY MODEL
In order to realize the purpose, the utility model discloses the technical scheme who adopts is: a refrigerating unit vacuum pumping system for transport refrigeration comprises a compressor, a vacuum pump, a condenser, an evaporator, a liquid storage tank, a pressure measuring device and a heat exchanger;
the vacuum pump is communicated with the pressure measuring device through a connecting hose; the low-pressure end of the compressor is communicated with the evaporator through a first pipeline; a crankcase pressure regulating valve is arranged on the first pipeline;
the high-pressure end of the compressor is communicated with the condenser through a third pipeline, and a main stop valve and a first one-way valve are arranged on the third pipeline; the condenser is communicated with the liquid storage tank through a seventh pipeline;
the evaporator is communicated with the condenser through a fifth pipeline, a liquid outlet valve of the liquid storage tank is communicated with the fifth pipeline through a sixth pipeline, and a connection section of the sixth pipeline and the fifth pipeline is arranged in the condenser; an expansion valve and a first stop valve are arranged on the fifth pipeline, and a dry filter is arranged on the sixth pipeline; a heat exchanger is arranged between the fifth pipeline and the first pipeline;
the low-pressure interface of the pressure measuring device is communicated with the low-pressure end of the compressor through a low-pressure hose; and a high-pressure interface of the pressure measuring device is communicated with a liquid outlet valve of the liquid storage tank through a high-pressure hose.
Based on the above, the high-pressure end of the compressor is communicated with the evaporator through a second pipeline, the second pipeline is provided with a defrosting valve, the second pipeline is communicated with the liquid storage tank through a fourth pipeline, and the fourth pipeline is provided with a hot air valve and a second one-way valve.
Based on the above, the two ends of the crankcase pressure regulating valve are provided with bypass branch pipes, and the bypass branch pipes are provided with bypass valves.
The utility model discloses relative prior art has substantive characteristics and progress, specific theory, the utility model provides a refrigerating unit vacuum pumping system for transport refrigeration, efficient operation method when evacuation through standardizing transport refrigeration unit when production, installation and maintenance comes the action of controlling all kinds of control valves, forms high, low pressure side evacuation scheme simultaneously, has not only improved the efficiency of maintenance, has still reduced the refrigerant emission to environmental pollution has been reduced.
Drawings
Fig. 1 is a schematic view of the overall connection relationship of the refrigerating unit vacuum pumping system for transport refrigeration provided by the present invention.
Fig. 2 is the connection schematic diagram of the state that the defrosting function of the refrigerating unit vacuum pumping system for transportation refrigeration is not opened.
In the figure: 1: a compressor; 2. a master cut-off valve; 3. a first check valve; 4. a condenser; 5. a liquid storage tank; 6. drying the filter; 7. a heat exchanger; 8. a first shut-off valve; 9. an expansion valve; 10. an evaporator; 11. a crankcase pressure regulating valve; 12. a bypass valve; 13. a defrosting valve; 14. a hot gas valve; 15. a second one-way valve; 16. a pressure measuring device; 17. a vacuum pump; 18. a low pressure hose; 19. a high pressure hose; 20. a connecting hose; 21. a first pipeline; 22. a second pipeline; 23. a third pipeline; 24. a fourth pipeline; 25. a fifth pipeline; 26. a sixth pipeline; 27. a seventh pipeline; 28. and a bypass branch pipe.
Detailed Description
The technical solution of the present invention will be described in further detail through the following embodiments.
Example 1
The present embodiment provides a vacuum pumping system for a transport refrigeration unit, as shown in fig. 1 and 2, including a compressor 1, a vacuum pump 17, a condenser 4, an evaporator 10, a liquid storage tank 5, a pressure measuring device 16, and a heat exchanger 7.
The vacuum pump 17 is in communication with the pressure measuring device 16 via a connecting hose 20. The low-pressure end of the compressor 1 is communicated with the evaporator 10 through a first pipeline 21; a crankcase pressure regulating valve 11 is arranged on the first line 21.
The high-pressure end of the compressor 1 is communicated with the condenser 4 through a third pipeline 23, and a main stop valve 2 and a first one-way valve 3 are arranged on the third pipeline 23. The condenser 4 is communicated with the liquid storage tank 5 through a seventh pipeline 27.
The evaporator 10 is communicated with the condenser 4 through a fifth pipeline 25, and the liquid outlet valve of the liquid storage tank 5 is communicated with the fifth pipeline 25 through a sixth pipeline 26. The section where the sixth pipeline 26 is connected with the fifth pipeline 25 is arranged in the condenser 4. An expansion valve 9 and a first stop valve 8 are arranged on the fifth pipeline 25, and a dry filter 6 is arranged on the sixth pipeline 26; a heat exchanger 7 is arranged between the fifth pipeline 25 and the first pipeline 21.
The low-pressure interface of the pressure measuring device 16 is communicated with the low-pressure end of the compressor 1 through a low-pressure hose 18; the high-pressure interface of the pressure measuring device 16 is communicated with the liquid outlet valve of the liquid storage tank 5 through a high-pressure hose 19.
In this embodiment, a second pipeline 22 is further connected between the high-pressure end of the compressor 1 and the evaporator 10, and the second pipeline 22 is provided with a defrosting valve 13. The second pipeline 22 is communicated with the liquid storage tank 5 through a fourth pipeline 24, and a hot air valve 14 and a second one-way valve 15 are arranged on the fourth pipeline 24.
Two ends of the crankcase pressure regulating valve 11 are provided with bypass branch pipes 28, and the bypass branch pipes 28 are provided with bypass valves 12.
Specifically, the low-pressure hose of a pressure gauge in the pressure measuring device is connected to a reserved needle valve at the low-pressure end of the compressor, the high-pressure hose of the pressure gauge is connected to a valve on the liquid storage device, and the connecting hose is connected to the vacuum pump in the installation environment after the connection of all pipelines is completed. At the moment, the first stop valve, the defrosting valve and the hot air valve are opened by controlling, and the vacuum pump can be started to vacuumize.
And under the maintenance environment, the liquid outlet valve of the liquid storage device is locked. And opening the unit to start operation, wherein all refrigerants start to completely enter the condenser and the liquid storage device at the moment, and the unit can be closed until the low pressure of the unit alarms, and at the moment, all refrigerants enter the condenser and the liquid storage device.
After the pipeline valve members except the high-pressure side of the compressor are replaced, a low-pressure hose of the pressure measuring device is connected to a reserved needle valve at the low-pressure end of the compressor, a high-pressure hose of the pressure measuring device is connected to a liquid outlet valve on the liquid storage device, and a connecting hose is connected to the vacuum pump. At the moment, the first stop valve and the defrosting valve are opened through control, the main stop valve is closed, the vacuum pump is started to vacuumize, and vacuumizing is not needed by means of external equipment or multiple pumps connected in parallel, so that time and labor are saved.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (3)
1. The utility model provides a refrigerating unit vacuum pumping system for transportation refrigeration which characterized in that: comprises a compressor, a vacuum pump, a condenser, an evaporator, a liquid storage tank, a pressure measuring device and a heat exchanger;
the vacuum pump is communicated with the pressure measuring device through a connecting hose; the low-pressure end of the compressor is communicated with the evaporator through a first pipeline; a crankcase pressure regulating valve is arranged on the first pipeline;
the high-pressure end of the compressor is communicated with the condenser through a third pipeline, and a main stop valve and a first one-way valve are arranged on the third pipeline; the condenser is communicated with the liquid storage tank through a seventh pipeline;
the evaporator is communicated with the condenser through a fifth pipeline, a liquid outlet valve of the liquid storage tank is communicated with the fifth pipeline through a sixth pipeline, and a connection section of the sixth pipeline and the fifth pipeline is arranged in the condenser; an expansion valve and a first stop valve are arranged on the fifth pipeline, and a dry filter is arranged on the sixth pipeline; a heat exchanger is arranged between the fifth pipeline and the first pipeline;
the low-pressure interface of the pressure measuring device is communicated with the low-pressure end of the compressor through a low-pressure hose; and a high-pressure interface of the pressure measuring device is communicated with a liquid outlet valve of the liquid storage tank through a high-pressure hose.
2. A transport refrigeration unit evacuation system as set forth in claim 1 wherein: the high-pressure end of the compressor is communicated with the evaporator through a second pipeline, a defrosting valve is arranged on the second pipeline, the second pipeline is communicated with the liquid storage tank through a fourth pipeline, and a hot air valve and a second one-way valve are arranged on the fourth pipeline.
3. A transport refrigeration unit evacuation system as set forth in claim 2 wherein: and bypass branch pipes are arranged at two ends of the crankcase pressure regulating valve, and bypass valves are arranged on the bypass branch pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120542396.8U CN215176232U (en) | 2021-03-16 | 2021-03-16 | Refrigerating unit vacuum pumping system for transport refrigeration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120542396.8U CN215176232U (en) | 2021-03-16 | 2021-03-16 | Refrigerating unit vacuum pumping system for transport refrigeration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215176232U true CN215176232U (en) | 2021-12-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120542396.8U Active CN215176232U (en) | 2021-03-16 | 2021-03-16 | Refrigerating unit vacuum pumping system for transport refrigeration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215176232U (en) |
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2021
- 2021-03-16 CN CN202120542396.8U patent/CN215176232U/en active Active
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