Low-temperature refrigeration house system

Abstract

The utility model discloses a low-temperature refrigeration house system, and belongs to the technical field of refrigeration houses. The system comprises a refrigeration house and a refrigeration mechanism, the refrigeration mechanism comprises two refrigeration units connected in parallel, and the refrigeration mechanism is connected with the refrigeration house through an air supply main pipe and connected with the refrigeration house through an air return main pipe. The two refrigerating units adopt a refrigerating and circulating air supply mode with one used refrigerating unit and one standby refrigerating unit, and it is guaranteed that the low-temperature refrigeration house is continuously in a low-temperature environment. When one refrigerating unit breaks down, the refrigeration house can be refrigerated through the other refrigerating unit, normal refrigeration of biological products in the refrigeration house is guaranteed, and the operation reliability of the refrigeration house is improved.

Description

Technical Field

[0001] This utility model relates to a low-temperature cold storage system and belongs to the field of cold storage technology. Background Technology

[0002] Biological product factories should have appropriate cold storage facilities because biological products are generally not resistant to high temperatures, especially live vaccines, which must be refrigerated at low temperatures. Vaccines produced are typically stored in cold storage. For example, freeze-dried products require storage below -15°C; the lower the temperature, the longer the storage time.

[0003] Chinese patent document CN218764165U discloses an automated cryogenic biological sample storage and retrieval cold storage system, including a cold storage room and a refrigeration system. A refrigeration box is installed on the upper part of the cold storage room. The refrigeration box includes an evaporator, an expansion valve, a defrosting heating device, and a fan. The refrigeration box adopts an insulated structure. Air ducts I and II, leading from the evaporator, are respectively connected to the interior of the cold storage room for air supply and return. A valve I is installed on air duct I, and a valve II is installed on air duct II, for opening or closing the air supply and return between the refrigeration box and the cold storage room. This system avoids the risks associated with personnel entering the cryogenic cold storage for maintenance and debugging; it allows for defrosting operations without affecting the temperature of the cryogenic storage space.

[0004] However, the cold storage only uses one air-cooled evaporator for refrigeration. When the air-cooled evaporator fails, the temperature of the cold storage will rise, which is not conducive to the normal refrigeration of biological products inside. In other words, the reliability of the cold storage needs to be further improved. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a low-temperature cold storage system.

[0006] This utility model is achieved through the following technical solution:

[0007] A low-temperature cold storage system includes a cold storage room and a refrigeration mechanism. The refrigeration mechanism includes two refrigeration units connected in parallel. The refrigeration mechanism is connected to the cold storage room through a main air supply pipe and a main air return pipe.

[0008] The refrigeration unit is connected to an air outlet located at the top of the cold storage via a main air supply pipe.

[0009] The refrigeration unit is connected to a return air vent located on the side wall of the cold storage via a main return air pipe.

[0010] The cold storage room is equipped with a balance window on the top.

[0011] The refrigeration unit includes an evaporator and a blower. The air inlet of the evaporator is connected to a return air branch pipe, and a return air valve is installed on the return air branch pipe. The air inlet of the blower is connected to the air outlet of the evaporator, and an air supply branch pipe is connected to the air outlet of the blower, and an air supply valve is installed on the air supply branch pipe.

[0012] The system also includes temperature sensor A, temperature sensor B, and a controller. Temperature sensor A is located inside the cold storage, temperature sensor B is located at the air outlet of the evaporator, and the controller is electrically connected to temperature sensor A and temperature sensor B, and is also electrically connected to the evaporator, blower, return air valve, and air supply valve of the two refrigeration units.

[0013] The beneficial effects of this invention are as follows: the two refrigeration units adopt a one-in-one standby refrigeration and circulating air supply method to ensure that the low-temperature cold storage is continuously kept in a low-temperature environment. When one refrigeration unit fails, the other refrigeration unit can still refrigerate the cold storage, ensuring the normal refrigeration of biological products inside and improving the operational reliability of the cold storage. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] In the diagram: 1-Return air main pipe, 2-Refrigeration unit, 20-Return air branch pipe, 21-Return air valve, 22-Evaporator, 23-Blower, 24-Blower valve, 25-Blower pipe, 3-Blower air main pipe, 4-Balance window, 5-Cold storage. Detailed Implementation

[0016] The technical solution of this utility model is further described below, but the scope of protection is not limited to what is described.

[0017] like Figure 1 As shown, the low-temperature cold storage system of this utility model includes a cold storage room 5 and a refrigeration mechanism. The refrigeration mechanism includes two refrigeration units 2 connected in parallel. The refrigeration mechanism is connected to the cold storage room 5 through a main air supply pipe 3 and a return air supply pipe 1. In operation, the two refrigeration units 2 operate in a one-in-one-out configuration with circulating air supply to ensure the cold storage room remains in a low-temperature environment. When one refrigeration unit 2 fails, the other refrigeration unit 2 can still refrigerate the cold storage room 5, ensuring the normal refrigeration of biological products inside and improving the operational reliability of the cold storage room 5. Furthermore, the two refrigeration units 2 operate in a one-in-one-out configuration, with the standby refrigeration unit 2 in a defrosting or waiting state, which facilitates defrosting of the refrigeration unit 2.

[0018] The refrigeration mechanism is connected to the air outlet 50 located at the top of the cold storage 5 via the main air supply pipe 3.

[0019] The refrigeration mechanism is connected to the return air inlet 51 located on the side wall of the cold storage 5 via the return air main pipe 1.

[0020] The top of the cold storage 5 is equipped with a balancing window 4. The balancing window 4 balances the pressure difference between the inside and outside of the cold storage 5.

[0021] The refrigeration unit 2 includes an evaporator 22 and a blower 23. The air inlet of the evaporator 22 is connected to a return air branch pipe 20, and a return air valve 21 is installed on the return air branch pipe 20. The air inlet of the blower 23 is connected to the air outlet of the evaporator 22, and an air supply branch pipe 25 is connected to the air outlet of the blower 23, and an air supply valve 24 is installed on the air supply branch pipe 25.

[0022] The system also includes temperature sensor A, temperature sensor B and controller. Temperature sensor A is located inside cold storage 5, temperature sensor B is located at the air outlet of evaporator 22, and controller is electrically connected to temperature sensor A and temperature sensor B. Controller is also electrically connected to evaporator 22, blower 23, return air valve 21 and air supply valve 24 in the two refrigeration units 2.

[0023] The working principle of the low-temperature cold storage system described in this utility model is as follows:

[0024] The temperature inside cold storage room 5 needs to be maintained between -27℃ and -22℃. Temperature sensor A detects the temperature inside cold storage 5 and transmits the relevant temperature information to the controller. When the temperature inside cold storage 5 is higher than -22℃, the controller starts the first refrigeration unit 2. Specifically, the controller first opens the return air valve 21, the supply air valve 24, and the evaporator 22 in refrigeration unit 2, and simultaneously detects the temperature at the air outlet of evaporator 22 through temperature sensor B. When the temperature at the air outlet of evaporator 22 drops to the required value, the supply fan 23 starts to send the cooling capacity of evaporator 22 into cold storage 5 through supply air branch pipe 25, supply air main pipe 3, and supply air outlet 50. After heat exchange is completed in cold storage 5, the cooling capacity returns to evaporator 22 through return air outlet 51, return air main pipe 1, and return air branch pipe 20. When the temperature inside cold storage 5 is lower than -27℃, the evaporator 22 in the first refrigeration unit 2 stops cooling, and the supply fan 23 runs for 5 minutes before stopping to ensure that all the cooling capacity of evaporator 22 is removed. During this process, the second refrigeration unit 2 is in defrosting or waiting state.

[0025] When the first refrigeration unit 2 is in defrosting or waiting state, and the second refrigeration unit 2 is running to refrigerate, its working principle is the same as above.

Claims

1. A low-temperature cold storage system, characterized in that: It includes a cold storage (5) and a refrigeration mechanism, the refrigeration mechanism including two refrigeration units (2) connected in parallel, the refrigeration mechanism being connected to the cold storage (5) through a main air supply pipe (3) and a main air return pipe (1).

2. The low-temperature cold storage system as described in claim 1, characterized in that: The refrigeration unit is connected to the air outlet (50) located on the top of the cold storage (5) via the main air supply pipe (3).

3. The low-temperature cold storage system as described in claim 1, characterized in that: The refrigeration mechanism is connected to the return air inlet (51) located on the side wall of the cold storage (5) via the return air main pipe (1).

4. The low-temperature cold storage system as described in claim 1, characterized in that: The top of the cold storage (5) is equipped with a balance window (4).

5. The low-temperature cold storage system as described in claim 1, characterized in that: The refrigeration unit (2) includes an evaporator (22) and a blower (23). The air inlet of the evaporator (22) is connected to a return air branch pipe (20), and a return air valve (21) is installed on the return air branch pipe (20). The air inlet of the blower (23) is connected to the air outlet of the evaporator (22). The air outlet of the blower (23) is connected to a blower branch pipe (25), and a blower valve (24) is installed on the blower branch pipe (25).

6. The low-temperature cold storage system as described in claim 5, characterized in that: The system also includes temperature sensor A, temperature sensor B and controller. Temperature sensor A is located inside the cold storage (5), temperature sensor B is located at the air outlet of the evaporator (22), and the controller is electrically connected to temperature sensor A and temperature sensor B, and is also electrically connected to the evaporator (22), blower (23), return air valve (21) and air supply valve (24) in the two refrigeration units (2).

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