Cold compressor assembly applied to superfluid helium refrigerating machine

Abstract

The utility model relates to a cold compressor assembly applied to a superfluid helium refrigerator, the cold compressor assembly is used for being skid-mounted in a main cold box, the cold compressor assembly comprises a cold compressor, a flange plate and a cooling structure, the cold compressor and the cooling structure are both arranged on the flange plate, and the cooling structure is arranged close to the cold compressor. The cold compressor assembly is used for being installed in a main cold box in a skid-mounted mode, so that the cold compressor assembly and the main cold box can share a vacuum environment, the cold compressor assembly does not need to be installed by independently configuring a cold box, and due to the fact that the cold compressor unit is installed in a skid-mounted mode, when the cold compressor assembly needs to be replaced and disassembled, the cold compressor assembly can be replaced conveniently. The cold compressor assembly can be moved out of the main cold box only by directly cutting off a pipeline connected with the cold compressor assembly, the cold compressor assembly is relatively independent, and replacement and maintenance of the cold compressor assembly basically have no influence on other components in the main cold box.

Description

Technical Field

[0001] The utility model relates to the technical field of ultra-low temperature refrigeration, in particular to a cold compressor component applied to a superfluid helium refrigerator. Background Art

[0002] Superfluid helium has a very high thermal conductivity, which is much higher than the thermal conductivity of metals and thousands of times that of copper. Because superfluid helium has excellent flow and heat transfer properties, it is often used to cool superconducting magnets in many applications. Superfluid helium is almost non-viscous and can easily penetrate into the interior of the magnet, quickly eliminating thermal disturbances. Using superfluid helium to cool accelerators and superconducting magnets can improve stability and reduce energy consumption and operating costs. With the widespread application of superfluid helium in high-energy physics, nuclear fusion, superconducting power and other fields, large-scale superfluid helium cryogenic systems have become indispensable infrastructure. The cold compressor unit is a key component of the large superfluid helium cryogenic system, but the disassembly and assembly of the cold compressor unit is usually difficult, and the disassembly and assembly will interfere with the operation of other components of the superfluid helium cryogenic system, thereby greatly affecting the operating efficiency of the superfluid helium cryogenic system. Utility Model Content

[0003] Based on this, it is necessary to provide a cold compressor assembly for a superfluid helium refrigerator, which is used to be skid-mounted in a main cold box, so that the cold compressor assembly can share a vacuum environment with the main cold box, and there is no need to separately configure a cold box to install the cold compressor assembly. Moreover, since the cold compressor assembly adopts a skid-mounted installation method, when the cold compressor assembly needs to be replaced and removed, it is only necessary to directly cut off the pipeline connected to the cold compressor assembly and then move the cold compressor assembly out of the main cold box. It is relatively independent, and its replacement and maintenance have basically no effect on other components in the main cold box. In addition, since the cold compressor assembly is equipped with a cooling structure, the cooling structure is arranged near the cold compressor, and the cooling structure can reduce heat leakage of the entire cold compressor assembly.

[0004] A cold compressor assembly applied to a superfluid helium refrigerator, the cold compressor assembly is used to be skidded into a main cold box, the cold compressor assembly comprises a cold compressor, a flange and a cooling structure, the cold compressor and the cooling structure are both arranged on the flange, and the cooling structure is arranged adjacent to the cold compressor.

[0005] In one embodiment, the cold compressor comprises a plurality of cold compressors, and the plurality of cold compressors are arranged in series or in parallel on the flange.

[0006] In one embodiment, the cold compressor assembly further includes a connecting pipe, and a plurality of the cold compressors are connected in series or in parallel via the connecting pipe.

[0007] In one of the embodiments, a temperature sensor and / or a pressure gauge is provided near the inlet and outlet of the cold compressor.

[0008] In one embodiment, the cooling structure includes a liquid nitrogen cooling shield.

[0009] In one of the embodiments, the liquid nitrogen cold shield includes a cold shield main board and a liquid nitrogen coil, wherein the cold shield main board is arranged on the bottom side of the flange, and the liquid nitrogen coil is arranged on a side of the cold shield main board facing the flange.

[0010] In one of the embodiments, the liquid nitrogen coil is arranged along the edge of the cold screen mainboard and around the cold compressor, and both ends of the liquid nitrogen coil extend to above the flange, and a liquid nitrogen input port and a liquid nitrogen output port are respectively provided at both ends of the liquid nitrogen coil.

[0011] In one of the embodiments, the cold compressor assembly further includes a fixing assembly, and the fixing assembly is used to fix the cold shield mainboard to the bottom side of the flange.

[0012] In one embodiment, the fixing assembly includes a tie rod seat, a tie rod and a locking nut. The tie rod seat is arranged on the bottom side of the flange plate, the first end of the tie rod is connected to the tie rod seat, the second end of the tie rod is passed through the cold shield main board and is threadedly matched with the locking nuts located on both sides of the cold shield main board to fix the cold shield main board to the bottom side of the flange plate.

[0013] In one embodiment, the cold compressor assembly is a vertical structure, the main cold box is a horizontal cold box, the cold compressor assembly is used to be pried mounted on the inner side of the top of the main cold box, and an installation port is provided on the top of the main cold box.

[0014] Since the cold compressor assembly used in the superfluid helium refrigerator of the present application is used to be skid-mounted in the main cold box, the cold compressor assembly can share the vacuum environment with the main cold box, and there is no need to separately configure a cold box to install the cold compressor assembly. In addition, since the cold compressor assembly is skid-mounted, when it is necessary to replace or remove the cold compressor assembly, it is only necessary to directly cut off the pipeline connected to the cold compressor assembly and then move the cold compressor assembly out of the main cold box. It is relatively independent, and its replacement and maintenance have basically no effect on other components in the main cold box. In addition, since the cold compressor assembly is equipped with a cooling structure, the cooling structure is arranged near the cold compressor, and the cooling structure can reduce heat leakage of the entire cold compressor assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the combination of a cold compressor assembly and a main cold box provided in an embodiment of the utility model;

[0016] Figure 2 A schematic structural diagram of a cold compressor assembly provided in an embodiment of the utility model;

[0017] Figure 3 A structural schematic diagram of a cold compressor assembly from another perspective provided by an embodiment of the utility model;

[0018] Figure 4 for Figure 2 The enlarged schematic diagram of point A in the middle;

[0019] Figure 5 A schematic diagram of the partial structure of a cold compressor assembly provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0023] like Figure 1 and Figure 2 As shown, the present application provides a cold compressor assembly 100 for a superfluid helium refrigerator, wherein the cold compressor assembly 100 is used to be skidded into a main cold box 200, and the cold compressor assembly 100 includes a cold compressor 110, a flange 120, and a cooling structure 130, wherein the cold compressor 110 and the cooling structure 130 are both arranged on the flange 120, and the cooling structure 130 is arranged adjacent to the cold compressor 110.

[0024] Since the cold compressor assembly 100 used in the superfluid helium refrigerator of the present application is used to be skid-mounted in the main cold box 200, the cold compressor assembly 100 can share the vacuum environment with the main cold box 200, and there is no need to separately configure a cold box to install the cold compressor assembly 100. In addition, since the cold compressor assembly 100 adopts a skid-mounted installation method, when it is necessary to replace and remove the cold compressor assembly 100, it is only necessary to directly cut off the pipeline connected to the cold compressor assembly 100 and then move the cold compressor assembly 100 out of the main cold box 200. It is relatively independent, and its replacement and maintenance have basically no effect on other components in the main cold box 200. In addition, since the cold compressor assembly 100 is equipped with a cooling structure 130, the cooling structure 130 is arranged near the cold compressor 110, and the cooling structure 130 can reduce heat leakage of the entire cold compressor assembly 100.

[0025] like Figure 1 As shown, specifically, the cold compressor assembly 100 is a vertical structure, and the main cold box 200 is a horizontal cold box. The cold compressor assembly 100 is used to be pried and installed on the inner side of the top of the main cold box 200. A mounting port 210 is provided on the top of the main cold box 200. The operator can install or remove the cold compressor assembly 100 relative to the main cold box 200 through the mounting port 210 on the top of the main cold box 200. The cold compressor assembly 100 is relatively independent, and its replacement and maintenance have little effect on other components in the main cold box 200.

[0026] like Figure 3 As shown, further, the cold compressor 110 includes a plurality of cold compressors 110, and the plurality of cold compressors 110 are arranged in series or in parallel on the flange 120. Specifically in this embodiment, the cold compressor 110 includes 4 cold compressors, and the 4 cold compressors 110 are arranged in series on the flange 120. It can be understood that in other embodiments, the number of cold compressors 110 can be 1 or more than 2, and the specific arrangement method can be reasonably selected according to actual needs.

[0027] like Figure 4 As shown, the flange 120 is provided with mounting holes 121, which penetrate the top and bottom sides of the flange 120, and the cold compressor 110 is installed in the mounting holes 121. Specifically, there are a plurality of mounting holes 121, which are arranged at intervals on the flange 120, and the plurality of mounting holes 121 correspond to the plurality of cold compressors 110 one by one.

[0028] like Figure 2 As shown, the cold compressor assembly 100 also includes a connecting pipe 150, and multiple cold compressors 110 are connected in series or in parallel through the connecting pipe 150. Specifically, the connecting pipe 150 connects the inlet and outlet of the multiple cold compressors 110 to achieve the mutual series or parallel connection between the multiple cold compressors 110.

[0029] A temperature sensor 151 and / or a pressure gauge are provided near the inlet and outlet of the cold compressor 110, wherein the temperature sensor 151 is used to detect the temperature of the inlet and outlet of the cold compressor 110, and the pressure gauge is used to detect the pressure of the inlet and outlet of the cold compressor 110, so as to judge whether the working state of the cold compressor 110 is normal according to the detection results of the temperature sensor 151 and / or the pressure gauge. Preferably, a temperature sensor 151 and a pressure gauge are provided near the inlet and outlet of each cold compressor 110.

[0030] like Figure 2 As shown, further, a temperature sensor 151 and a pressure gauge connection joint 152 are provided on the connection pipe 150 connecting the inlet and outlet of the cold compressor 110, and the pressure gauge connection joint 152 is used to connect the pressure gauge.

[0031] Furthermore, the connecting pipe 150 is a deformable hose, such as a bellows, so that the stress of the connecting pipe 150 can be reduced, thereby avoiding the risk of damage to the inlet and outlet of the compressor due to excessive stress on the connecting pipe 150.

[0032] like Figure 2 and Figure 5 As shown, in an optional embodiment, the cooling structure 130 includes a liquid nitrogen cold shield 140, and the liquid nitrogen cold shield 140 includes a cold shield main board 141 and a liquid nitrogen coil 142. The cold shield main board 141 is arranged on the bottom side of the flange 120, and the liquid nitrogen coil 142 is arranged on the side of the cold shield main board 141 facing the flange 120. Specifically, liquid nitrogen is used as a refrigerant to provide cold capacity to the cold shield main board 141. The liquid nitrogen flows into the liquid nitrogen coil 142 through the input port of the liquid nitrogen coil 142 to exchange heat with the cold shield main board 141, and then flows out of the liquid nitrogen coil 142 through the output port of the liquid nitrogen coil 142 to the outside of the liquid nitrogen coil 142, so that the temperature of the entire cold shield main board 141 is reduced, thereby achieving the effect of reducing the heat leakage of the entire cold compressor assembly 100.

[0033] The input port of the liquid nitrogen coil 142 is used to connect the liquid nitrogen tank body. The liquid nitrogen flows out of the liquid nitrogen tank body and flows into the liquid nitrogen coil 142 through the input port of the liquid nitrogen coil 142 to exchange heat with the cold shield main board 141, and then flows out of the liquid nitrogen coil 142 through the output port of the liquid nitrogen coil 142. Specifically, the liquid nitrogen coil 142 is evenly laid on the cold shield main board 141, and the liquid nitrogen enters the liquid nitrogen coil 142 through the input port of the liquid nitrogen coil 142, and exchanges heat with the cold shield main board 141 through the tube wall of the liquid nitrogen coil 142, so that the temperature of the entire cold shield main board 141 is reduced, thereby achieving the effect of reducing the heat leakage of the entire cold compressor assembly 100.

[0034] Specifically in this embodiment, the liquid nitrogen coil 142 is arranged along the edge of the cold screen mainboard 141 and around the cold compressor 110, and both ends of the liquid nitrogen coil 142 extend to the top of the flange 120, and the two ends of the liquid nitrogen coil 142 are respectively provided with a liquid nitrogen input port and a liquid nitrogen output port.

[0035] Preferably, the cold shield mainboard 141 and the liquid nitrogen coil 142 are both made of high thermal conductivity materials, such as copper or aluminum alloy.

[0036] like Figure 4 and Figure 5 As shown, the cold compressor assembly 100 further includes a fixing assembly 170 , and the fixing assembly 170 is used to fix the cold shield mainboard 141 to the bottom side of the flange 120 .

[0037] The fixing assembly 170 includes a tie rod seat 171, a tie rod 172 and a locking nut 173. The tie rod seat 171 is arranged on the bottom side of the flange 120. The first end of the tie rod 172 is connected to the tie rod seat 171. The second end of the tie rod 172 is passed through the cold shield main board 141 and is threadedly matched with the locking nuts 173 located on both sides of the cold shield main board 141 to fix the cold shield main board 141 to the bottom side of the flange 120. Specifically, the tie rod seat 171 can be welded and fixed to the bottom side of the flange 120, the tie rod 172 can be made of a low thermal conductivity material, the first end of the tie rod 172 is inserted into the tie rod seat 171, and the locking nut 173 is sleeved on the outside of the tie rod 172.

[0038] In order to improve the fixing stability of the cold shield mainboard 141 relative to the flange 120 , there are multiple fixing components 170 , and the multiple fixing components 170 are arranged at intervals on the outer periphery of the cold shield mainboard 141 along the circumference of the cold shield mainboard 141 .

[0039] Specifically, the flange 120 and the cold shield mainboard 141 are spaced apart from top to bottom, the flange 120 and the cold shield mainboard 141 are arranged in parallel, the cold shield mainboard 141 is disc-shaped, the cold shield mainboard 141 and the flange 120 are arranged coaxially, and the diameter of the cold shield mainboard 141 is smaller than the diameter of the flange 120 .

[0040] Furthermore, the cold shield mainboard 141 is provided with avoidance holes 143 arranged corresponding to the mounting holes 121 and the cold compressor 110. The avoidance holes 143 are used for the passage of the cold compressor 110. That is to say, the cold compressor 110 is sequentially passed through the mounting holes 121 and the avoidance holes 143. There are multiple avoidance holes 143, and the multiple avoidance holes 143 are arranged at intervals on the cold shield mainboard 141. The multiple avoidance holes 143 correspond one by one to the multiple mounting holes 121 and the multiple cold compressors 110, respectively.

[0041] like Figure 2As shown, further, a lug 180 is provided on the top side of the flange 120 to facilitate the hoisting operation of the cold compressor assembly 100. Preferably, there are multiple lugs 180, and multiple lugs 180 are arranged at intervals on the top side of the flange 120. Specifically, in this embodiment, there are 4 lugs 180, and the 4 lugs 180 are distributed in a cross shape on the top side of the flange 120. It can be understood that in other embodiments, the number of lugs 180 can be 1 or more than 2, and the specific setting method can be reasonably selected according to actual needs.

[0042] like Figure 1 As shown, further, a plurality of functional components 300 are arranged at intervals in the main cold box 200 . Specifically, each functional component 300 is skid-mounted in the main cold box 200 .

[0043] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The above embodiments only express the preferred implementation of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A cold compressor assembly for a superfluid helium refrigerator, characterized in that: The cold compressor assembly is used for being skidded into the main cold box. The cold compressor assembly comprises a cold compressor, a flange and a cooling structure. The cold compressor and the cooling structure are both arranged on the flange, and the cooling structure is arranged adjacent to the cold compressor.

2. The cold compressor assembly for superfluid helium refrigerator according to claim 1, characterized in that: The cold compressors include a plurality of cold compressors, which are arranged in series or in parallel on the flange.

3. The cold compressor assembly for superfluid helium refrigerator according to claim 1, characterized in that: The cold compressor assembly also includes a connecting pipeline, and a plurality of the cold compressors are connected in series or in parallel via the connecting pipeline.

4. The cold compressor assembly for a superfluid helium refrigerator according to claim 1, characterized in that: A temperature sensor and / or a pressure gauge is arranged near the inlet and outlet of the cold compressor.

5. The cold compressor assembly for superfluid helium refrigerator according to claim 1, characterized in that: The cooling structure includes a liquid nitrogen cooling shield.

6. The cold compressor assembly for a superfluid helium refrigerator according to claim 5, characterized in that: The liquid nitrogen cold shield comprises a cold shield main board and a liquid nitrogen coil. The cold shield main board is arranged on the bottom side of the flange, and the liquid nitrogen coil is arranged on a side of the cold shield main board facing the flange.

7. The cold compressor assembly for superfluid helium refrigerator according to claim 6, characterized in that: The liquid nitrogen coil is arranged along the edge of the cold screen mainboard and around the cold compressor, and both ends of the liquid nitrogen coil extend to above the flange, and the two ends of the liquid nitrogen coil are respectively provided with a liquid nitrogen input port and a liquid nitrogen output port.

8. The cold compressor assembly for use in a superfluid helium refrigerator according to claim 6, characterized in that: The cold compressor assembly also includes a fixing assembly, which is used to fix the cold shield mainboard to the bottom side of the flange.

9. The cold compressor assembly for use in a superfluid helium refrigerator according to claim 8, characterized in that: The fixing assembly includes a tie rod seat, a tie rod and a locking nut. The tie rod seat is arranged on the bottom side of the flange, the first end of the tie rod is connected to the tie rod seat, the second end of the tie rod is passed through the cold shield main board and cooperates with the locking nut threads located on both sides of the cold shield main board to fix the cold shield main board to the bottom side of the flange.

10. The cold compressor assembly for superfluid helium refrigerator according to claim 1, characterized in that: The cold compressor assembly is a vertical structure, the main cold box is a horizontal cold box, the cold compressor assembly is used to be pried mounted on the inner side of the top of the main cold box, and a mounting port is provided on the top of the main cold box.

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