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CN-224201907-U - Ultralow temperature refrigerating system for refrigeration house

CN224201907UCN 224201907 UCN224201907 UCN 224201907UCN-224201907-U

Abstract

The utility model belongs to the technical field of ultralow temperature refrigeration, and particularly relates to an ultralow temperature refrigeration system for a refrigeration house, which comprises a first refrigeration system, a second refrigeration system and a heat exchanger, wherein the first refrigeration system comprises a first compressor, a first oil-gas separator and a first condenser which are sequentially connected end to end, and further comprises a first refrigerant circularly flowing in the first refrigeration system, the second refrigeration system comprises a second compressor, a second oil-gas separator and an evaporator which are sequentially connected end to end, and further comprises a second refrigerant circularly flowing in the second refrigeration system, and the evaporator is positioned in the refrigeration house and used for cooling the refrigeration house. Compared with the prior art, the refrigeration system solves the technical problem that the refrigeration house cannot be reduced to an ultralow temperature state in the prior art by arranging the second refrigeration system.

Inventors

  • SHU BIN

Assignees

  • 贵州长旺实业发展有限公司

Dates

Publication Date
20260505
Application Date
20250611

Claims (7)

  1. 1. The ultralow temperature refrigeration system for the refrigeration house is characterized by comprising a first refrigeration system, a second refrigeration system and a heat exchanger, wherein the first refrigeration system comprises a first compressor, a first oil-gas separator and a first condenser which are sequentially connected end to end, and further comprises a first refrigerant which circularly flows in the first refrigeration system; The second refrigerating system comprises a second compressor, a second oil-gas separator and an evaporator which are sequentially connected end to end, and further comprises a second refrigerant circularly flowing in the second refrigerating system; The evaporator is positioned in the refrigeration house for cooling the refrigeration house; The heat exchanger comprises a first heat exchange channel and a second heat exchange channel; one end of the first heat exchange channel is communicated with the first condenser, and the other end of the first heat exchange channel is communicated with the first compressor, so that the condensed first refrigerant is expanded into a gaseous state; One end of the second heat exchange channel is communicated with the evaporator, and the other end of the second heat exchange channel is communicated with the second oil-gas separator to condense the gaseous second refrigerant into a liquid state.
  2. 2. The ultralow temperature refrigeration system for a refrigerator according to claim 1, further comprising an oil mist capturing device, wherein the oil mist capturing device comprises a shell, two ends of the shell are respectively communicated with the second condenser and the evaporator in a sealing mode, and a foam capturing net for capturing oil foam is arranged inside the shell.
  3. 3. The ultralow temperature refrigeration system for a refrigerator according to claim 2, wherein the evaporator comprises an air inlet pipe, the shell is circular-pipe-shaped, and the ratio of the inner diameter of the shell to the inner diameter of the air inlet pipe is 1:0.7-0.8.
  4. 4. An ultralow temperature refrigeration system for a refrigerator according to claim 3, wherein said foam-trapping net is formed by interlacing a plurality of metal strips, and a plurality of meshes for passing gas are distributed on said foam-trapping net.
  5. 5. The ultralow temperature refrigeration system for a refrigerator according to claim 4, wherein a first control valve communicated with the inside of the casing is arranged below the casing, an output end of the first control valve is communicated with a collecting box, and a second control valve is arranged at the bottom of the collecting box.
  6. 6. The ultralow temperature refrigeration system for a refrigerator according to claim 5, wherein the edge of the foam-trapping net is fixed with the inner wall of the casing, and the included angle between the central axis of the foam-trapping net and the central axis of the casing is 30-90 degrees.
  7. 7. The ultralow temperature refrigeration system for a refrigerator according to claim 6, wherein the metal strip comprises a first metal wire, and a second metal wire is wound around an outer peripheral surface of the first metal wire.

Description

Ultralow temperature refrigerating system for refrigeration house Technical Field The utility model belongs to the technical field of ultralow temperature refrigeration, and particularly relates to an ultralow temperature refrigeration system for a refrigeration house. Background With the rapid development of the industries of modern cold chain logistics, biomedical treatment, food processing and the like, the application range of the refrigeration house as an important facility for storing temperature sensitive articles is wider and wider. In the biomedical field, the ultralow temperature refrigeration house is commonly used for storing biological samples such as vaccines, stem cells, blood products and the like, in the food processing industry, the ultralow temperature refrigeration is helpful for better keeping the nutrition components and the taste of foods, the scenes all put strict requirements on the ultralow temperature refrigeration performance of the refrigeration house, and the internal temperature of the refrigeration house is required to be below-70 ℃. However, most of the existing refrigeration systems adopt a single-stage refrigeration cycle structure, and the refrigeration capacity of the single-stage refrigeration system is limited by factors such as the characteristics of refrigerant, the compression ratio and the like, and the refrigeration temperature of the single-stage refrigeration system can only reach more than-30 ℃ generally, so that the requirement of an ultralow-temperature refrigeration house on an ultralow-temperature environment below-70 ℃ is difficult to meet. Meanwhile, in the running process of the refrigeration system, lubricating oil in the compressor can circulate along with the refrigerant, and even if the lubricating oil is purified by the oil-gas separator, a small amount of oil mist still enters the evaporator. Because the temperature in the evaporator is lower, the viscosity of the lubricating oil is increased in a low-temperature environment, the lubricating oil is easy to adhere to the pipe wall of the evaporator, the heat exchange efficiency between the refrigerant and the refrigeration house environment is seriously affected, the refrigeration effect is reduced, and meanwhile, the overhaul frequency and the maintenance cost of the refrigeration system are increased. Therefore, how to break through the temperature limit of a single-stage refrigeration system, design a refrigeration system capable of realizing ultralow-temperature refrigeration and effectively reducing the adhesion of oil mist in an evaporator is a technical problem to be solved. Disclosure of utility model The utility model aims to provide an ultralow temperature refrigerating system for a refrigerator, which is mainly used for solving the technical problems that most of refrigerating systems in the prior art adopt a single-stage refrigerating cycle structure, the refrigerating capacity of the single-stage refrigerating system is limited by factors such as refrigerant characteristics, compression ratio and the like, the refrigerating temperature of the single-stage refrigerating system can only reach more than-30 ℃ generally, and the requirement of the ultralow temperature refrigerator on the ultralow temperature environment below-70 ℃ is difficult to meet. In order to solve the technical problems, the utility model provides the following technical scheme: an ultralow-temperature refrigerating system for a refrigeration house comprises a first refrigerating system, a second refrigerating system and a heat exchanger; The first refrigerating system comprises a first compressor, a first oil-gas separator, a first condenser and a first refrigerant circularly flowing in the first refrigerating system, wherein the first compressor, the first oil-gas separator and the first condenser are sequentially connected end to end; The second refrigerating system comprises a second compressor, a second oil-gas separator and an evaporator which are sequentially connected end to end, and further comprises a second refrigerant circularly flowing in the second refrigerating system; The evaporator is positioned in the refrigeration house for cooling the refrigeration house; The heat exchanger comprises a first heat exchange channel and a second heat exchange channel; one end of the first heat exchange channel is communicated with the first condenser, and the other end of the first heat exchange channel is communicated with the first compressor, so that the condensed first refrigerant is expanded into a gaseous state; One end of the second heat exchange channel is communicated with the evaporator, and the other end of the second heat exchange channel is communicated with the second oil-gas separator to condense the gaseous second refrigerant into a liquid state. Preferably, the second refrigerating system further comprises an oil mist capturing device, the oil mist capturing device comprises a shell, two ends of the sh