A R508B transcritical ultra-low temperature refrigeration system

Abstract

The utility model belongs to the field of refrigeration technology, and specifically discloses an R508B transcritical ultra-low temperature refrigeration system, including a low-temperature compressor, a high-temperature compressor connected to the low-temperature compressor, an oil separator connected to the high-temperature compressor, an oil collector and a heat recovery device connected to the oil separator, an air cooler connected to the heat recovery device, an ejector connected to the air cooler, a liquid reservoir connected to the ejector, a liquid supply filter connected to the liquid reservoir, an ultra-low temperature evaporator connected to the liquid supply filter, and a high-temperature evaporator. The utility model adopts the transcritical operation of the low-temperature refrigerant and a two-stage ratio system to achieve safe and energy-saving operation of the ultra-low temperature refrigeration system.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration, in particular to an R508B transcritical ultra-low temperature refrigeration system. Background Art

[0002] With the pharmaceutical industry's demand for large-scale ultra-low temperature storage of drugs, higher requirements are placed on the safe and energy-saving operation of the system. The existing ultra-low temperature refrigeration generally adopts a superposition system of high-temperature refrigerant and low-temperature refrigerant. This system has a complex structure, cumbersome control, and a high failure rate, which brings unsafe factors to use. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides an R508B transcritical ultra-low temperature refrigeration system, which adopts transcritical operation of low-temperature refrigerant and a two-stage ratio system to achieve safe and energy-saving operation of the ultra-low temperature refrigeration system.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A R508B transcritical ultra-low temperature refrigeration system comprises a low-temperature compressor, a high-temperature compressor connected to the low-temperature compressor, an oil separator connected to the high-temperature compressor, an oil collector and a heat recovery device connected to the oil separator, an air cooler connected to the heat recovery device, an ejector connected to the air cooler, a liquid reservoir connected to the ejector, a liquid supply filter connected to the liquid reservoir, an ultra-low temperature evaporator connected to the liquid supply filter, and a high-temperature evaporator.

[0006] Furthermore, the high-temperature evaporator is connected to the high-temperature compressor via one pipeline; and is connected to the high-temperature evaporator ejector via another pipeline.

[0007] Further, the high temperature evaporator ejector is connected to the ejector.

[0008] Furthermore, it also includes a compressor oil balancer connected to the oil collector.

[0009] The utility model adopts the transcritical operation of the low-temperature refrigerant and a two-stage ratio system to achieve safe and energy-saving operation of the ultra-low temperature refrigeration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the refrigeration system of the utility model;

[0011] In the figure: 1. Low-temperature compressor; 2. High-temperature compressor; 3. Oil separator; 4. Oil collector; 5. Oil collector pressure relief valve; 6. Compressor oil balancer; 7. Heat recovery device; 8. Air cooler; 9. High-temperature evaporator ejector; 10. Air cooler pressure maintenance and ejector valve; 11. Ejector; 12. Liquid reservoir; 13. Liquid reservoir pressure maintenance pressure relief valve; 14. Liquid reservoir pressure maintenance control valve; 15. Liquid supply filter; 16. Ultra-low temperature evaporator liquid supply solenoid valve; 17. Ultra-low temperature evaporator liquid supply expansion valve; 18. Ultra-low temperature evaporator; 19. High-temperature evaporator liquid supply solenoid valve; 20. High-temperature evaporator liquid supply expansion valve; 21. High-temperature evaporator; 22. High-temperature evaporator return air solenoid valve. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0013] For examples, see Figure 1 As shown, an R508B transcritical ultra-low temperature refrigeration system includes a low-temperature compressor 1, a high-temperature compressor 2 connected to the low-temperature compressor 1, an oil separator 3 connected to the high-temperature compressor 2, an oil collector 4 and a heat recovery device 7 connected to the oil separator 3, an air cooler 8 connected to the heat recovery device 7, an ejector 11 connected to the air cooler 8, a liquid reservoir 12 connected to the ejector 11, a liquid supply filter 15 connected to the liquid reservoir 12, an ultra-low temperature evaporator 18 and a high-temperature evaporator 21 connected to the liquid supply filter 15; and also includes a compressor oil balancer 6 connected to the oil collector 4.

[0014] Specifically, the high temperature evaporator 21 is connected to the high temperature compressor 2 through one pipeline, and is connected to the high temperature evaporator ejector 9 through another pipeline; the high temperature evaporator ejector 9 is connected to the ejector 11. An air cooler pressure maintenance and ejector valve 10 is provided between the air cooler 8 and the ejector 11.

[0015] The working process of the R508B transcritical refrigeration system of the utility model is as follows:

[0016] (1) High temperature system workflow

[0017] The high-temperature compressor 2 inhales the R508B refrigerant gas discharged from the low-temperature compressor 1 through the accumulator pressure maintenance relief valve 13 and enters the oil separator 3, and enters the air cooler 8 through the heat recovery device 7. After the gas temperature is reduced by heat dissipation, it passes through the R508B air cooler pressure maintenance and ejector valve 10 and ejector 11 for throttling, and then enters the accumulator 12 for gas-liquid separation. The gas is controlled by the accumulator pressure maintenance control valve 14, and enters the high-temperature compressor 2 for inhalation through the accumulator pressure maintenance relief valve 13 to complete a cycle.

[0018] (2) Low temperature system workflow

[0019] The refrigerant liquid in the liquid storage tank 12 is supplied to the super-temperature evaporator 18 through the liquid supply filter 15, the ultra-low temperature evaporator liquid supply solenoid valve 16, and the ultra-low temperature evaporator liquid supply expansion valve 17 in sequence, and the refrigerant liquid absorbs heat and vaporizes in the ultra-low temperature evaporator 18. The low temperature stage compressor 1 inhales the gas from the ultra-low temperature evaporator 18 and discharges it into the high temperature stage compressor 2 after compression.

[0020] (3) Oil circulation process:

[0021] The refrigerant oil separated by the oil separator 3 enters the oil collector 4, the gas is controlled by the oil collector pressure relief valve 5, and the refrigerant oil is supplied to the compressor by the compressor oil balancer 6.

[0022] (4) High temperature evaporator process:

[0023] The refrigerant liquid from the liquid storage tank 12 passes through the liquid supply filter 15, the high-temperature evaporator liquid supply solenoid valve 19, and the high-temperature evaporator liquid supply expansion valve 20 to enter the high-temperature evaporator 21 to absorb heat and evaporate. The refrigerant gas generated is divided into two situations. When the ambient temperature is lower than 20°C, the gas passes through the high-temperature evaporator return gas solenoid valve 22 and enters the high-temperature compressor 2; when the ambient temperature is higher than 25°C, the gas enters the high-temperature evaporator ejector 9 and enters the liquid storage tank 12 through the ejector 11.

[0024] Special applications:

[0025] If the cold storage is used in intervals, each time from high temperature to low temperature, you can run the high temperature stage first, and when the storage temperature reaches the set low temperature, then open the two-stage system to drop to ultra-low temperature.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A R508B transcritical ultra-low temperature refrigeration system, characterized in that: The invention comprises a low-temperature compressor (1), a high-temperature compressor (2) connected to the low-temperature compressor (1), an oil separator (3) connected to the high-temperature compressor (2), an oil collector (4) and a heat recovery device (7) connected to the oil separator (3), an air cooler (8) connected to the heat recovery device (7), an ejector (11) connected to the air cooler (8), a liquid storage device (12) connected to the ejector (11), a liquid supply filter (15) connected to the liquid storage device (12), an ultra-low temperature evaporator (18) and a high-temperature evaporator (21) connected to the liquid supply filter (15).

2. The R508B transcritical ultra-low temperature refrigeration system according to claim 1, characterized in that: The high-temperature evaporator (21) is connected to the high-temperature compressor (2) via a pipeline and is connected to the high-temperature evaporator ejector (9) via another pipeline.

3. The R508B transcritical ultra-low temperature refrigeration system according to claim 2, characterized in that: The high-temperature evaporator ejector (9) is connected to the ejector (11).

4. The R508B transcritical ultra-low temperature refrigeration system according to claim 1, characterized in that: It also includes a compressor oil balancer (6) connected to the oil collector (4).

5. The R508B transcritical ultra-low temperature refrigeration system according to claim 1, characterized in that: An air cooler pressure maintaining and ejection valve (10) is provided between the air cooler (8) and the ejector (11).

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