Detachable high-precision filter applied to cold box of helium refrigerator

Abstract

The detachable high-precision filter comprises a filter element cylinder, a sintered filter element assembly and a flange assembly, the lower portion of the filter element cylinder penetrates into the cold box, and an outlet connecting pipe and an inlet connecting pipe are arranged at the bottom and the side face of the filter element cylinder correspondingly; the sintered filter element assembly is arranged in the portion, extending into the cold box, of the filter element cylinder, the bottom of the sintered filter element assembly faces the outlet connecting pipe, and the side face of the sintered filter element assembly faces the inlet connecting pipe so that gas can sequentially pass through the outlet connecting pipe, the sintered filter element assembly and the inlet connecting pipe. The flange assembly is fixed to the top of the filter element cylinder in a sealed mode, when the sintered filter element assembly needs to be maintained and replaced, the flange assembly can be directly opened, the sintered filter element assembly can be taken out from the top of the filter element cylinder, non-stop online replacement is achieved, and a cold box does not need to be disassembled.

Description

Technical Field

[0001] This invention relates to the field of cryogenic equipment technology, and in particular to a detachable high-precision filter used in the cold box of a helium refrigeration machine. Background Technology

[0002] Helium cryogenic refrigerators are core equipment in cutting-edge fields such as superconducting magnets, quantum computing, and aerospace exploration. Their stable operation depends on the high cleanliness of the internal refrigeration system. During long-term operation, the cold box may become clogged due to the precipitation of internal adsorbent materials, the precipitation of impurities from the operation of the cryogenic heat exchanger, or the introduction of particulate matter from external contamination, which can seriously affect the refrigeration efficiency and equipment lifespan.

[0003] Currently, most helium refrigerators use welded fixed filters inside the cold box. Their structure is not removable, and maintenance requires the entire machine to be shut down and the cold box to be disassembled, which consumes a lot of time and cannot guarantee continuous operation of the cold box. There are also some removable cryogenic filters in the existing technology, but their sealing structure is in the ultra-low temperature range for a long time and is inside the vacuum cold box, which has a great risk of leakage. Summary of the Invention

[0004] To address the issue of slow cleaning efficiency, this invention proposes a detachable high-precision filter for use in the cold box of a helium refrigeration unit.

[0005] This invention is achieved through the following technical solution: This invention proposes a detachable high-precision filter for use in a helium refrigeration unit cold box, comprising a filter element cylinder, a sintered filter element assembly, and a flange assembly, wherein: The lower part of the filter element cylinder extends into the interior of the cold box. The bottom and side of the filter element cylinder are respectively provided with an outlet pipe and an inlet pipe. The sintered filter element assembly is disposed inside the part of the filter element cylinder that extends into the cold box. The bottom of the sintered filter element assembly faces the outlet pipe, and the side of the sintered filter element assembly faces the inlet pipe, so that the gas passes through the outlet pipe, the sintered filter element assembly, and the inlet pipe in sequence. The flange assembly is sealed and fixed to the top of the filter element cylinder.

[0006] Furthermore, it also includes a support assembly, which includes support rods, filter element caps, and support plates. The tops of the multiple support rods are connected to the support plates, and the bottoms are connected to the filter element caps. The filter element caps are fixedly connected to the top of the sintered filter element assembly.

[0007] Furthermore, the flange assembly includes a flange cover and a fixed flange. The fixed flange is fixed to the top of the filter element cylinder. A sealing gasket is provided between the flange cover and the fixed flange. The flange cover is fixed to the top of the fixed flange and presses the sealing gasket to seal.

[0008] Furthermore, a spring assembly is provided between the flange cover and the support plate, the spring assembly being used to apply pressure to the support plate.

[0009] Furthermore, multiple radiation shields are arranged on the support rod.

[0010] Furthermore, the method also includes a sealing component, which is disposed between the outer wall of the sintered filter element assembly and the inner wall of the filter element cylinder, and the sealing component is used to complete the sealing between the sintered filter element assembly and the filter element cylinder.

[0011] The beneficial effects of this invention are: The detachable high-precision filter proposed in this invention, used in the cold box of a helium refrigeration unit, has part of the filter element cylinder inside the cold box and part outside the cold box. At the same time, the sintered filter element assembly is set inside the filter element cylinder, so that the gas passes through the outlet pipe, the sintered filter element assembly and the inlet pipe in sequence to complete the filtration. When the sintered filter element assembly needs to be repaired or replaced, the flange assembly can be opened directly and the sintered filter element assembly can be taken out from the top of the filter element cylinder, realizing online replacement without stopping the machine and without disassembling the cold box. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of the removable high-precision filter of the present invention used in the cold box of a helium refrigeration machine; Figure 2 This is an overall structural diagram of the detachable high-precision filter of the present invention used in the cold box of a helium refrigeration machine; In the figure: 1. Filter cartridge body; 2. Sintered filter cartridge assembly; 3. Filter cartridge cover; 4. Sealing assembly; 5. Support plate; 6. Spring assembly; 7. Flange cover; 8. Fixed flange; 9. Support rod; 10. Radiation shield; 11. Outlet pipe; 12. Inlet pipe. The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0013] To more clearly and completely illustrate the technical solution of the present invention, the present invention will be further described below with reference to the accompanying drawings.

[0014] Please refer to Figures 1-2 This invention proposes a detachable high-precision filter for use in a helium refrigeration unit cold box, comprising a filter element cylinder 1, a sintered filter element assembly 2, and a flange assembly, wherein: The lower part of the filter element cylinder 1 extends into the interior of the cold box. The bottom and side of the filter element cylinder 1 are respectively provided with an outlet pipe 11 and an inlet pipe 12. The sintered filter element assembly 2 is located inside the part of the filter element cylinder 1 that extends into the cold box. The bottom of the sintered filter element assembly 2 faces the outlet pipe 11 and the side of the sintered filter element assembly 2 faces the inlet pipe 12, so that the gas passes through the outlet pipe 11, the sintered filter element assembly 2 and the inlet pipe 12 in sequence. The flange assembly is sealed and fixed to the top of the filter element cylinder 1.

[0015] In a specific embodiment, the filter element cylinder 1 is welded to the partition flange of the vacuum cold box. The top of the filter element cylinder 1 is sealed by the flange assembly. The upper half of the filter element cylinder 1 is located in the normal temperature and pressure region, and the lower half is located inside the cold box. An inlet pipe 12 is provided on the side of the filter element cylinder 1 that enters the cold box, and an outlet pipe 11 is provided at the bottom of the filter element cylinder 1. The sintered filter element assembly 2 is inserted into the cylinder. The sintered filter element assembly 2 is hollow. The side of the sintered filter element assembly 2 is aligned with the inlet pipe 12, and the bottom faces the inlet pipe 12. When filtering the gas, the gas first enters the inlet pipe 12, then the sintered filter element assembly 2, and after being filtered by the sintered filter element assembly 2, it enters the outlet pipe 11 at the bottom to complete the filtration. When the sintered filter element assembly 2 needs to be repaired or replaced, the flange assembly can be opened directly and the sintered filter element assembly 2 can be taken out from the top of the filter element cylinder 1, realizing online replacement without stopping the machine and without disassembling the cold box.

[0016] Furthermore, it also includes a support assembly, which includes support rods 9, filter element caps 3 and support plates 5. The top of the multiple support rods 9 is connected to the support plates 5 and the bottom is connected to the filter element caps 3. The filter element caps 3 are fixedly connected to the top of the sintered filter element assembly 2.

[0017] In a specific embodiment, the filter element cap 3 is used to seal the top of the sintered filter element assembly 2 to prevent gas from entering the outside through the inlet pipe 12. At the same time, the filter element cap 3 can be used to connect the sintered filter element assembly 2. The top of the filter element cap 3 is connected to the support plate 5 by the support rod 9. It is more convenient to remove the sintered filter element assembly by the support rod 9. At the same time, the support assembly can better isolate the low temperature part and the normal temperature part, reducing the loss of cold energy.

[0018] Furthermore, the flange assembly includes a flange cover 7 and a fixed flange 8. The fixed flange 8 is fixed to the top of the filter element cylinder 1. A sealing gasket is provided between the flange cover 7 and the fixed flange 8. The flange cover 7 is fixed to the top of the fixed flange 8 and presses the sealing gasket to seal.

[0019] In a specific embodiment, the sealing gasket is a PTFE gasket, the fixing flange 8 is fixed to the top of the filter element cylinder 1, the sealing flange is used to seal the top of the filter element cylinder 1, and the sealing gasket is used to enhance the seal.

[0020] Furthermore, a spring assembly 6 is provided between the flange cover 7 and the support plate 5, and the spring assembly 6 is used to apply pressure to the support plate 5.

[0021] In a specific embodiment, the spring assembly 6 applies downward pressure to the support plate 5, which better secures the sintered filter element assembly 2 and prevents it from moving. It also further improves the seal between the bottom of the sintered filter element assembly 2 and the filter element cylinder 1. Furthermore, multiple radiation shields are arranged on the support rod 9.

[0022] In a specific implementation, the radiation-proof cold screen 10 uses three layers of aluminum sheets, which can effectively reduce heat leakage.

[0023] Furthermore, it also includes a sealing component 4, which is disposed between the outer wall of the sintered filter element assembly 2 and the inner wall of the filter element cylinder 1. The sealing component 4 is used to complete the sealing between the sintered filter element assembly 2 and the filter element cylinder 1.

[0024] In a specific embodiment, the sealing component 4 is made of polytetrafluoroethylene material with excellent low-temperature sealing performance. The sealing component 4 can effectively seal the airflow between the inlet pipe 12 and the outlet pipe 11, preventing the airflow from directly entering the outlet pipe 11 from the inlet pipe 12.

[0025] Of course, the present invention may have many other embodiments. Based on this embodiment, other embodiments obtained by those skilled in the art without any creative effort are all within the scope of protection of the present invention.

Claims

1. A detachable high-precision filter used in the cold box of a helium refrigeration unit, characterized in that, Includes filter cartridge body, sintered filter cartridge assembly, and flange assembly, wherein: The lower part of the filter element cylinder extends into the interior of the cold box. The bottom and side of the filter element cylinder are respectively provided with an outlet pipe and an inlet pipe. The sintered filter element assembly is disposed inside the part of the filter element cylinder that extends into the cold box. The bottom of the sintered filter element assembly faces the outlet pipe, and the side of the sintered filter element assembly faces the inlet pipe, so that the gas passes through the outlet pipe, the sintered filter element assembly, and the inlet pipe in sequence. The flange assembly is sealed and fixed to the top of the filter element cylinder.

2. The detachable high-precision filter used in the cold box of a helium refrigeration unit according to claim 1, characterized in that, It also includes a support assembly, which includes support rods, filter element caps and support plates. The top of the multiple support rods is connected to the support plate and the bottom of the filter element caps. The filter element caps are fixedly connected to the top of the sintered filter element assembly.

3. The detachable high-precision filter used in the cold box of a helium refrigeration unit according to claim 2, characterized in that, The flange assembly includes a flange cover and a fixed flange. The fixed flange is fixed to the top of the filter element cylinder. A sealing gasket is provided between the flange cover and the fixed flange. The flange cover is fixed to the top of the fixed flange and presses the sealing gasket to seal.

4. The detachable high-precision filter used in the cold box of a helium refrigeration unit according to claim 3, characterized in that, A spring assembly is also provided between the flange cover and the support plate, and the spring assembly is used to apply pressure to the support plate.

5. The detachable high-precision filter used in the cold box of a helium refrigeration unit according to claim 2, characterized in that, Multiple radiation shields are arranged on the support rod.

6. The detachable high-precision filter used in the cold box of a helium refrigeration unit according to claim 1, characterized in that, The system also includes a sealing component disposed between the outer wall of the sintered filter element assembly and the inner wall of the filter element cylinder, the sealing component being used to seal the sintered filter element assembly and the filter element cylinder.

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