Ultralow-temperature cold storage system

Abstract

The utility model belongs to the technical field of refrigeration, and particularly discloses an ultralow-temperature refrigeration house system which comprises a low-temperature house, a low-temperature house refrigeration system, an ultralow-temperature house, an ultralow-temperature house refrigeration system and an automatic control system. The ultra-low temperature warehouse refrigerating system provides an ultra-low temperature environment of-50 DEG C to-75 DEG C for the ultra-low temperature warehouse; the automatic control system is used for controlling the low-temperature warehouse refrigerating system and the ultralow-temperature warehouse refrigerating system; according to the system, an R507A low-temperature refrigeration system is adopted to create a low-temperature warehouse environment firstly, the warehouse temperature meets the condensing temperature of an R508B refrigerant, the R508B system is made into the ultralow-temperature refrigeration warehouse in a single-stage mode, and safe and energy-saving operation of the ultralow-temperature refrigeration system is achieved.

Description

Technical Field

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

[0002] With the requirements of the pharmaceutical industry for large-scale ultra-low temperature storage of drugs, higher requirements are put forward for the safe and energy-saving operation of the system. The existing ultra-low temperature refrigeration generally adopts a cascade system of R507A / R508B. This system has a complex structure, cumbersome control, and a high failure rate, bringing unsafe factors to use. Content of the Utility Model

[0003] In order to solve the above technical problems, the utility model provides an ultra-low temperature cold storage system. The system uses an R507A low-temperature refrigeration system to create a low-temperature storage environment first, and the storage temperature meets the condensation temperature of the R508B refrigerant, so that the R508B system can produce ultra-low temperature cold storage at a single stage, realizing the safe and energy-saving operation of the ultra-low temperature refrigeration system.

[0004] To achieve the above object, the utility model provides the following technical solutions:

[0005] An ultra-low temperature cold storage system includes a low-temperature storage, a low-temperature storage refrigeration system, an ultra-low temperature storage, an ultra-low temperature storage refrigeration system, and an automatic control system. The low-temperature storage refrigeration system provides a low-temperature environment of -10°C to -20°C for the low-temperature storage, and the ultra-low temperature storage refrigeration system provides an ultra-low temperature environment of -50°C to -75°C for the ultra-low temperature storage;

[0006] The automatic control system is used to control the low-temperature storage refrigeration system and the ultra-low temperature storage refrigeration system;

[0007] The low-temperature storage refrigeration system includes a first low-temperature compressor, a first oil separator, a refrigerant R507A condenser, a first liquid receiver, a first air cooler, and a first gas separator.

[0008] A liquid supply solenoid valve one and an expansion valve one are successively arranged on the pipeline connecting the first liquid receiver and the first air cooler.

[0009] The ultra-low temperature storage refrigeration system includes a second low-temperature compressor, an oil separator, a refrigerant R508B condenser, a second liquid receiver, a second air cooler, a second gas separator, and an expansion tank; a liquid supply solenoid valve two and an expansion valve two are successively arranged on the pipeline connecting the second liquid receiver and the second air cooler.

[0010] An overpressure relief valve is arranged on the pipeline connecting the second liquid receiver and the expansion tank.

[0011] A suction pressure maintaining valve is arranged on the outlet pipeline of the expansion tank.

[0012] This utility model adopts an R507A low-temperature refrigeration system to first create a low-temperature storage environment where the storage temperature meets the condensation temperature of the R508B refrigerant, enabling the R508B system to produce ultra-low temperature cold storage at a single stage and achieving the safe and energy-saving operation of the ultra-low temperature refrigeration system. Description of the Drawings

[0013] Figure 1 is the overall layout schematic diagram of this utility model;

[0014] Figure 2 is the structural schematic diagram of the low-temperature storage refrigeration system in this utility model;

[0015] Figure 3 is the structural schematic diagram of the ultra-low temperature storage refrigeration system in this utility model;

[0016] In the figure: 1. Low-temperature storage refrigeration system; 2. Ultra-low temperature storage refrigeration system; 3. Ultra-low temperature storage; 4. Low-temperature storage; 101. First low-temperature compressor; 102. First oil separator; 103. Condenser for refrigerant R507A; 104. First liquid receiver; 105. First air cooler; 108. First gas separator; 105. First liquid supply solenoid valve; 106. First expansion valve; 201. Second low-temperature compressor; 202. Oil separator; 203. Condenser for refrigerant R508B; 204. Second liquid receiver; 205. Second liquid supply solenoid valve; 206. Second expansion valve; 207. Second air cooler; 208. Second gas separator; 209. Expansion tank; 2010. Suction pressure maintaining valve; 2011. Overpressure relief valve. Detailed Embodiment

[0017] Next, the technical solutions in the embodiments of this utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this utility model without making creative efforts belong to the scope of protection of this utility model.

[0018] Embodiment An ultra-low temperature cold storage system has a structure as Figure 1 shown, including a low-temperature storage 4, a low-temperature storage refrigeration system 1, an ultra-low temperature storage 3, an ultra-low temperature storage refrigeration system 2, and an automatic control system. The low-temperature storage refrigeration system 1 provides a low-temperature environment of -10°C to -20°C for the low-temperature storage 4, and the ultra-low temperature storage refrigeration system 2 provides an ultra-low temperature environment of -50°C to -75°C for the ultra-low temperature storage 3;

[0019] The automatic control system is used to control the refrigeration system 1 of the low-temperature storage and the refrigeration system 2 of the ultra-low temperature storage. Specifically, when the ultra-low temperature cold storage is needed, the automatic control system first operates the refrigeration system of the low-temperature storage according to the temperature in the low-temperature storage environment room. When the temperature in the low-temperature storage reaches <-10°C, the automatic control system operates the refrigeration system of the ultra-low temperature storage according to the set temperature of the ultra-low temperature storage. The architecture of this automatic control system is prior art and will not be elaborated here.

[0020] As shown in Figure 2 , the refrigeration system 1 of the low-temperature storage includes the first low-temperature compressor 101, the first oil separator 102, the refrigerant R507A condenser 103, the first liquid receiver 104, the first air cooler 107 and the first gas separator 108.

[0021] The purpose of this low-temperature storage refrigeration system is to produce a low temperature of -10°C to -20°C in the low-temperature storage to meet the condensation temperature requirements of the ultra-low temperature refrigeration system R508B. Its working principle is as follows: The first low-temperature compressor 101 sucks in the refrigerant gas from the first gas separator 108, compresses it into a high-temperature and high-pressure refrigerant gas, enters the first oil separator 102 for separation, and then the gas enters the refrigerant R507A condenser 103 to be condensed into a liquid. The liquid enters the first liquid receiver 104. After the liquid passes through the first liquid supply solenoid valve 105 and the first expansion valve 106 for throttling, the low-temperature and low-pressure refrigerant liquid enters the first air cooler 107 to absorb heat and evaporate. The gas passes through the first gas separator 108 and enters the first low-temperature compressor 101 to complete a refrigeration cycle. In this process, the heat in the low-temperature storage environment room is removed to the atmospheric environment, keeping the low-temperature storage environment room at a low temperature of -10°C to -20°C.

[0022] Specifically, the first liquid supply solenoid valve 105 and the first expansion valve 106 are successively arranged on the pipeline connecting the first liquid receiver 104 and the first air cooler 107.

[0023] As shown in Figure 3 , the refrigeration system 2 of the ultra-low temperature storage includes the second low-temperature compressor 201, the oil separator 202, the refrigerant R508B condenser 203, the second liquid receiver 204, the second air cooler 207, the second gas separator 208 and the expansion tank 209. The second liquid supply solenoid valve 205 and the second expansion valve 206 are successively arranged on the pipeline connecting the second liquid receiver 204 and the second air cooler 207.

[0024] Specifically, a high-pressure relief valve 2011 is arranged on the pipeline connecting the second liquid receiver 204 and the expansion tank 209; a suction pressure maintaining valve 2010 is arranged on the outlet pipeline of the expansion tank 209.

[0025] Since the low-temperature storage environment room maintains a low temperature, it meets the condensation of the R508B refrigerant system. Specifically: The low-temperature compressor sucks the R508B refrigerant gas coming from the gas separator 208 at -201, compresses it into a high-temperature and high-pressure refrigerant gas, enters the oil separator 202 for separation, and then the gas enters the R508B refrigerant condenser 203 to be condensed into a liquid. The liquid enters the liquid receiver 204. After the liquid passes through the liquid supply solenoid valve 205 and the expansion valve 206 for throttling, the low-temperature and low-pressure refrigerant liquid enters the cooling fan 207 to absorb heat and evaporate. The gas enters the low-temperature compressor 201 through the gas separator 208, completing a refrigeration cycle. If the system high-pressure exceeds the design pressure, the overpressure relief valve 2011 opens to relieve pressure to the expansion tank 209. If the suction pressure is lower than the low-pressure set value required for actual operation, the suction pressure maintaining valve 2010 opens to supplement refrigerant to the system, ensuring the safe and efficient operation of the system.

[0026] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ultra-low temperature cold storage system, characterized in that: The invention comprises a low temperature storehouse (4), a low temperature storehouse refrigeration system (1), an ultra-low temperature storehouse (3), an ultra-low temperature storehouse refrigeration system (2) and an automatic control system, wherein the low temperature storehouse refrigeration system (1) provides a low temperature environment of -10°C to -20°C for the low temperature storehouse (4), and the ultra-low temperature storehouse refrigeration system (2) provides an ultra-low temperature environment of -50°C to -75°C for the ultra-low temperature storehouse (3); The automatic control system is used to control a low temperature storage refrigeration system (1) and an ultra-low temperature storage refrigeration system (2); The low-temperature storage refrigeration system (1) comprises a low-temperature compressor (101), an oil separator (102), a refrigerant R507A condenser (103), a liquid storage tank (104), a cooling fan (107) and a gas separator (108).

2. The ultra-low temperature cold storage system according to claim 1 is characterized in that: A liquid supply solenoid valve (105) and an expansion valve (106) are sequentially arranged on a pipeline connecting the liquid storage tank (104) and the cooling fan (107).

3. The ultra-low temperature cold storage system according to claim 1 is characterized in that: The ultra-low temperature storage refrigeration system (2) comprises a second low temperature compressor (201), an oil separator (202), a refrigerant R508B condenser (203), a second liquid storage tank (204), a second cold air blower (207), a second gas separator (208) and an expansion tank (209); a second liquid supply solenoid valve (205) and a second expansion valve (206) are sequentially arranged on the pipeline connecting the second liquid storage tank (204) and the second cold air blower (207).

4. The ultra-low temperature cold storage system according to claim 1 is characterized in that: An overpressure relief valve (211) is provided on the pipeline connecting the second liquid storage tank (204) and the expansion tank (209).

5. The ultra-low temperature cold storage system according to claim 1 is characterized in that: An intake pressure maintaining valve (2010) is provided on the outlet pipeline of the expansion tank (209).

Images