Moisture isolation system of ultralow-temperature storage room

Abstract

The moisture isolation system of the ultralow-temperature storage room comprises an air compressor, an air storage tank and an air dehumidification assembly which are sequentially connected, and the air dehumidification assembly comprises a first-stage condenser, a second-stage condenser, a third-stage condenser and an air buffer tank which are sequentially connected. An exhaust port pipeline of the air storage tank is connected with an air inlet of the first-stage condenser, an exhaust port of the air buffer tank is connected with an air inlet of the ultralow-temperature storage room through an air inlet pipe, a pressure regulating valve is arranged on the air inlet pipe, and an electromagnetic valve is arranged on a connecting pipeline of the exhaust port of the air buffer tank. And a pressure release valve is arranged in the ultralow-temperature storage room. Micro-positive pressure is kept in the target storage room by filling dry air, and water is effectively prevented from entering the storage room to cause freezing.

Description

Technical Field

[0001] The utility model belongs to the technical field of refrigeration equipment, and in particular relates to a moisture isolation system for an ultra-low temperature storage room. Background Art

[0002] To achieve long-term storage of biological samples in medicine, they are typically stored in rooms maintained at -86°C or colder. Ultra-low temperature storage rooms are equipped with sampling ports. Each time a sampling port is opened to access a sample, air inevitably enters the enclosed space. Moisture in the air can freeze inside the room, affecting the operation of automated equipment like motor slides and causing seals to freeze. Utility Model Content

[0003] In order to solve the technical problem of moisture entering the air, the utility model provides a moisture isolation system for an ultra-low temperature storage room, which maintains a slightly positive pressure in the target storage room by filling it with dry air, effectively preventing moisture from entering the storage room and freezing.

[0004] In order to achieve the purpose of this utility model, the technical solution adopted by this utility model is:

[0005] A moisture isolation system for an ultra-low temperature storage room comprises an air compressor, an air storage tank and an air dehumidification assembly connected in sequence, the air dehumidification assembly comprises a primary condenser, a secondary condenser, a tertiary condenser and an air buffer tank connected in sequence, the exhaust pipe of the air storage tank is connected to the air inlet of the primary condenser, the exhaust port of the air buffer tank is connected to the air inlet of the ultra-low temperature storage room via an air inlet pipe, the air inlet pipe is provided with a pressure regulating valve, the connecting pipe of the exhaust port of the air buffer tank is provided with a solenoid valve, and the ultra-low temperature storage room is provided with a pressure relief valve.

[0006] The air dehumidification components of the present invention are provided with two groups, the exhaust pipe of the air storage tank is connected to the air inlet of the two first-stage condensers, the exhaust ports of the two air buffer tanks are connected to the air inlet pipe through an exhaust pipe respectively, and the solenoid valve is provided on the two exhaust pipes.

[0007] A fourth-stage condenser is further provided between the third-stage condenser and the air buffer tank of the utility model.

[0008] The air dehumidification component of the utility model is provided with a drainage main pipe, the drainage pipes of all condensers are connected to the drainage main pipe, and the water outlet of the drainage main pipe is connected to the moisture collection tank.

[0009] The beneficial effects of the present invention are:

[0010] 1. Install an air buffer tank behind the last condenser. This allows the dry air stored in the air buffer tank to immediately enter the ultra-low temperature storage room when the solenoid valve is opened. The compressed air entering the storage room is regulated to a low pressure by a pressure regulating valve to prevent excessive pressure. Dry compressed air is continuously introduced into the storage room, and a pressure relief valve regulates the pressure inside the storage room to maintain the set pressure, ensuring a slight positive pressure. Atmospheric air cannot enter when the sampling port is open, nor can it enter through gaps in the storage room. This isolates moisture from the atmosphere and prevents ice from forming inside the storage room.

[0011] 2. The air dehumidification component consists of multiple condensers, which gradually reduce the temperature to the same level as the temperature inside the ultra-low temperature storage room to avoid freezing and ice blockage caused by a one-time cooling to an ultra-low temperature of -70 to -120°C.

[0012] 3. Set up two sets of air dehumidification components. When one set of dehumidification components melts the accumulated ice through heating and is in a heating regeneration state, the solenoid valve can be used to control the rotation to the other set of components to continue the dehumidification work, thereby continuously providing dry air. This solution can prevent ice blockage in the condenser during long-term operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of the moisture isolation system of the ultra-low temperature storage room of the present invention.

[0014] Figure 2 This is a schematic structural diagram of the moisture isolation system of the ultra-low temperature storage room of Example 2.

[0015] The markings in the figure are: 1. Air compressor, 2. Air storage tank, 3. Air dehumidification component, 4. Air buffer tank, 5. Ultra-low temperature storage room, 6. Moisture collection tank, 7. Pressure regulating valve, 8. Pressure relief valve, 9. Solenoid valve, 11. Drain pipe, 12. Drain main pipe, 13. Inlet pipe, 31. First-stage condenser, 32. Second-stage condenser, 33. Third-stage condenser, 34. Fourth-stage condenser. DETAILED DESCRIPTION

[0016] In order to more clearly and in detail illustrate the purpose and technical solution of the utility model, the utility model is further described below through relevant embodiments. The following embodiments are only for the purpose of specifically illustrating the implementation method of the utility model and do not limit the scope of protection of the utility model.

[0017] Example 1

[0018] like Figure 1As shown, a moisture isolation system for an ultra-low temperature storage room includes an air compressor 1, an air storage tank 2 and an air dehumidification component 3 connected in sequence. The air dehumidification component 3 includes a first-stage condenser 31, a second-stage condenser 32, a third-stage condenser 33 and an air buffer tank 4 connected in sequence. The exhaust pipe of the air storage tank 2 is connected to the air inlet of the first-stage condenser 31, and the exhaust port of the air buffer tank 4 is connected to the air inlet of the ultra-low temperature storage room 5 through an air inlet pipe 13. A pressure regulating valve 7 is provided on the air inlet pipe 13, and a solenoid valve 9 is provided on the connecting pipe of the exhaust port of the air buffer tank 4. The ultra-low temperature storage room 5 is provided with a pressure relief valve 8.

[0019] After being pressurized by the compressor, the air first enters the air storage tank 2 for storage, and then slowly enters the air dehumidification component 3 through flow control to remove moisture. The air dehumidification component 3 is composed of multiple condensers, which gradually reduce the temperature to the same level as the temperature inside the ultra-low temperature storage room 5. This prevents freezing and ice blockage caused by a one-time cooling to ultra-low temperatures of -70 to -120°C. An air buffer tank 4 is installed behind the last condenser to facilitate the immediate entry of the dry air stored in the air buffer tank 4 into the ultra-low temperature storage room 5 when the solenoid valve 9 is opened. Since only a slight positive pressure is required to provide the ultra-low temperature storage room 5, a pressure regulating valve 7 is installed on the air inlet pipe 13 to facilitate the control of the gas pressure entering the ultra-low temperature storage room 5. The pressure relief valve 8 releases air according to the set pressure, maintaining the pressure at a slight positive pressure to ensure the safety and accuracy of the internal pressure.

[0020] The dry low-pressure air is continuously filled in by the solenoid valve 9, and the slightly positive pressure environment prevents air from entering the gaps in the storage room. When the sampling port is opened, the air in the atmosphere cannot enter either, isolating the moisture in the air.

[0021] Example 2

[0022] This embodiment is based on embodiment 1:

[0023] like Figure 2 As shown, the air dehumidification component 3 is provided with two groups, the exhaust pipe of the air storage tank 2 is connected to the air inlet of the two first-stage condensers 31, and the exhaust ports of the two air buffer tanks 4 are connected to the air inlet pipe 13 through an exhaust pipe respectively, and the solenoid valve 9 is provided on both exhaust pipes.

[0024] Although the air dehumidification component 3 can gradually reduce the temperature and remove water to reduce the probability of ice blockage, there is still a possibility of ice blockage. It is necessary to melt the accumulated ice through heating and regeneration to avoid ice blockage. At this time, the two solenoid valves 9 are used to control the rotation of another dehumidification component to continue working; always ensure that one set of components maintains dehumidification work, realizing uninterrupted and continuous supply of dry air.

[0025] Example 3

[0026] This embodiment is based on embodiment 1:

[0027] A fourth-stage condenser 34 is further provided between the third-stage condenser 33 and the air buffer tank 4. Condensers may be added as needed.

[0028] The air dehumidification component 3 is provided with a drainage main pipe 12 , and the drainage pipes 11 of all condensers are connected to the drainage main pipe 12 , and the water outlet of the drainage main pipe 12 is connected to the moisture collection tank 6 .

[0029] The pressure regulating valve adopted by the utility model adopts the precision pressure regulating valve NIR2000, and the pressure relief valve adopts the MSX-W10pa differential pressure transmitter.

[0030] The air compressor, condenser and solenoid valve involved in the utility model are all conventional equipment in the field.

[0031] The connection methods not mentioned in the present invention are conventional connection methods such as welding, clamping, riveting, hinged connection, threaded connection or bonding.

[0032] The above-described embodiments merely represent specific implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A moisture isolation system for an ultra-low temperature storage room, characterized by: It includes an air compressor, an air storage tank and an air dehumidification component connected in sequence. The air dehumidification component includes a first-stage condenser, a second-stage condenser, a third-stage condenser and an air buffer tank connected in sequence. The exhaust pipe of the air storage tank is connected to the air inlet of the first-stage condenser. The exhaust port of the air buffer tank is connected to the air inlet of the ultra-low temperature storage room through an air inlet pipe. A pressure regulating valve is provided on the air inlet pipe. A solenoid valve is provided on the connecting pipe of the exhaust port of the air buffer tank. The ultra-low temperature storage room is provided with a pressure relief valve.

2. The moisture isolation system for an ultra-low temperature storage room according to claim 1, characterized in that: The air dehumidification components are provided in two groups, the exhaust pipe of the air storage tank is connected to the air inlet of the two first-stage condensers, the exhaust ports of the two air buffer tanks are connected to the air inlet pipe through an exhaust pipe respectively, and the solenoid valve is provided on both exhaust pipes.

3. The moisture isolation system for an ultra-low temperature storage room according to claim 1, characterized in that: A fourth-stage condenser is further provided between the third-stage condenser and the air buffer tank.

4. The moisture isolation system for an ultra-low temperature storage room according to claim 1, characterized in that: The air dehumidification component is provided with a drainage main pipe, the drainage pipes of all condensers are connected to the drainage main pipe, and the water outlet of the drainage main pipe is connected to the moisture collection tank.

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