Search

CN-224221064-U - Micro negative pressure circulation purifying device of cryogenic separation cold box

CN224221064UCN 224221064 UCN224221064 UCN 224221064UCN-224221064-U

Abstract

The utility model relates to a micro-negative pressure circulation purifying device for a cryogenic separation cold box, and belongs to the technical field of cold boxes. The micro negative pressure circulation purification device for the cryogenic separation cold box comprises a heat insulation shell, a composite heat insulation layer, a circulating pump, an internal air duct and a micro negative pressure circulation design, wherein an air flow circulation cavity is formed in the bottom of the heat insulation shell, an insertion cavity is formed in the top of the heat insulation shell, the composite heat insulation layer is made of a metal frame and pearly-lustre interweaved filling material members, the circulating pump is embedded and installed on the inner side of the air flow circulation cavity, the air inlet end of the circulating pump faces the insertion cavity, a traditional external pipeline is replaced by the internal air duct, the heat exchange interface between the pipeline and the external environment is greatly reduced, the heat conduction inhibition capability of the metal frame-pearly-lustre composite heat insulation layer is combined, the temperature fluctuation risk in the cold box is remarkably reduced, the micro negative pressure circulation design enables gas to flow directionally, local temperature accumulation is avoided, and the accurate maintenance of the ultra-low temperature environment of the cold box is integrally realized by matching with a modularized sealing assembly.

Inventors

  • Teng Deqi

Assignees

  • 深圳富鼎智控有限公司

Dates

Publication Date
20260512
Application Date
20250530

Claims (8)

  1. 1. Micro negative pressure circulation purification device of cryogenic separation cold box, characterized by comprising: The heat-insulating shell (100), wherein an airflow circulation cavity (110) is formed in the bottom of the heat-insulating shell (100), and an inserting cavity (120) is formed in the top of the heat-insulating shell (100); A composite heat insulating layer (200), wherein the composite heat insulating layer (200) is a filling material member formed by interweaving a metal frame and pearlitic sand; The circulating pump (300) is embedded and installed on the inner side of the airflow circulating cavity (110), and the air inlet end of the circulating pump (300) faces the inserting cavity (120); The number of the built-in air guide pipes (400) is two, the built-in air guide pipes (400) are fixedly connected to the bottom of the heat insulation shell (100), and the two built-in air guide pipes (400) are respectively communicated with two openings of the air flow circulation cavity (110); And the filtering mechanism (500) is arranged inside the inserting cavity (120).
  2. 2. The cryogenic separation cold box micro negative pressure circulation purification device according to claim 1, wherein the filtering mechanism (500) comprises a collecting box (510) inserted into the insertion cavity (120), air holes (520) communicated with the air flow circulation cavity (110) are formed in two ends of the collecting box (510), and a filter screen (530) is embedded and installed in the air holes (520) close to the circulation pump (300).
  3. 3. The cryogenic separation cold box micro negative pressure circulation purification device according to claim 2, wherein the number of the insertion cavity (120) and the number of the filtering mechanisms (500) are the same and are not less than three, and the mesh diameter of the filtering net (530) is larger than the mesh diameter of the filtering net (530) adjacent to the circulating pump (300).
  4. 4. The cryogenic separation cold box micro negative pressure circulation purification device according to claim 2, wherein a protective cover (540) contacting with the heat insulation shell (100) is fixedly connected to the top of the collection box (510), and the protective cover (540) is larger than the horizontal cross-section size of the insertion cavity (120).
  5. 5. The cryogenic separation cold box micro negative pressure circulation purification device according to claim 4, wherein a screw rod (550) is rotatably connected to the top of the protective cover (540), and the bottom of the screw rod (550) sequentially penetrates through the protective cover (540) and the collecting box (510) and is in threaded connection with the insertion cavity (120).
  6. 6. The micro negative pressure circulation purification device of the cryogenic separation cold box according to claim 5, wherein a rotating handle (560) is fixedly connected to the top of the screw rod (550), and corners of the rotating handle (560) are rounded.
  7. 7. The micro negative pressure circulation purifying device of the cryogenic separation cold box according to claim 4, wherein the top of the protective cover (540) is embedded with a square sealing ring (570) which is contacted with the heat insulation shell (100), and the inserting cavity (120) is arranged on the inner side of the square sealing ring (570).
  8. 8. The cryogenic separation cold box micro negative pressure circulation purification device according to claim 2, wherein one end of the collecting box (510) facing away from the filter screen (530) is fixedly connected with a circular sealing ring (580) contacting with the inserting cavity (120), and the communicating parts of the inserting cavity (120) and the air holes (520) facing away from the circulating pump (300) are all arranged on the inner side of the circular sealing ring (580).

Description

Micro negative pressure circulation purifying device of cryogenic separation cold box Technical Field The utility model relates to the technical field of cold boxes, in particular to a micro negative pressure circulation purifying device for a cryogenic separation cold box. Background The cryogenic separation cold box is a closed type device integrating a high-efficiency heat exchanger, a low-temperature separation component and an adiabatic system, and the condensation liquefaction and the step-by-step purification are realized by cooling the gas below-100 ℃ (the extreme working condition can reach-196 ℃), and utilizing the boiling point difference between the components. At present, chinese patent discloses a cryogenic separation cold box micro negative pressure circulation purifier (authorized bulletin number CN 219976891U), circulation air supply mechanism includes the suction fan, first circulation pipeline and second circulation pipeline, one side welding of cryogenic separation box has the fixed plate, the bottom screw fixation of suction fan is in one side of fixed plate, the both ends of first circulation pipeline are connected respectively at the top of suction fan and are run through the inside of rose box and carry out extraction gas, second circulation pipeline both ends are connected respectively at the bottom of suction fan and are run through the inside of cryogenic separation box and carry out gas, the surface screw fixation of cryogenic separation box has the backup pad, the other end of backup pad is connected and is supported the reinforcement at the surface of first circulation pipeline, circulation air supply mechanism is located filtering module's top. The current system adopts external circulation pipeline to match with a fan for gas delivery, and can realize the gas circulation purification function, but because the circulation pipeline is exposed in the external environment, the temperature of the flowing gas is easily influenced by the ambient temperature and rises, and the fluctuation of the internal temperature of the cold box is caused, so that the efficient recovery of the tail gas cold quantity by the plate-fin heat exchanger is influenced. Disclosure of utility model Based on the above, it is necessary to provide a micro negative pressure circulation purifying device for a cryogenic separation cold box, which aims at the problem that the temperature fluctuation in the cryogenic separation cold box is increased in the conventional micro negative pressure circulation purifying device for the cryogenic separation cold box. A cryogenic separation cold box micro negative pressure circulation purification device, comprising: The heat-insulating shell is provided with an airflow circulation cavity at the bottom and an inserting cavity at the top; the composite heat insulation layer is a filling material member formed by interweaving a metal frame and pearlife; The circulating pump is embedded and installed at the inner side of the airflow circulating cavity, and the air inlet end of the circulating pump faces the inserting cavity; The number of the built-in air ducts is two, the built-in air ducts are fixedly connected to the bottom of the heat insulation shell, and the two built-in air ducts are respectively communicated with two openings of the air flow circulation cavity; the filtering mechanism is arranged in the inserting cavity. In one embodiment, the filtering mechanism comprises a collecting box inserted into the inserting cavity, air holes communicated with the air flow circulating cavity are formed in two ends of the collecting box, and a filter screen is embedded into the air holes close to the circulating pump. In one embodiment, the number of the inserting cavities and the number of the filtering mechanisms are the same and are not less than three, and the mesh diameter of the filter screen is larger than that of the filter screen adjacent to the circulating pump. In one embodiment, a protective cover in contact with the heat insulating shell is fixedly connected to the top of the collecting box, and the protective cover is larger than the horizontal section size of the inserting cavity. In one embodiment, the top of the protective cover is rotatably connected with a screw, and the bottom of the screw sequentially penetrates through the protective cover and the collecting box and is in threaded connection with the inserting cavity. In one embodiment, the top of the screw is fixedly connected with a rotating handle, and corners of the rotating handle are rounded. In one embodiment, the top of the protective cover is embedded and provided with a square sealing ring which is in contact with the heat insulation shell, and the inserting cavity is arranged on the inner side of the square sealing ring. In one embodiment, one end of the collecting box, which is opposite to the filter screen, is fixedly connected with a circular sealing ring which is in contact with the inserti