Throttling refrigeration assembly and detector

Abstract

The utility model relates to the technical field of throttling refrigeration detectors, in particular to a throttling refrigeration assembly and a detector. The throttling refrigeration assembly comprises a refrigerator and a Dewar which are connected in a coupled mode, the refrigerator comprises a mandrel and a heat exchanger, the heat exchanger is wound on the mandrel, the throttling refrigeration assembly further comprises a filling layer arranged between the Dewar and the heat exchanger in a clamped mode, and the filling layer is made of flexible materials. The first matching surface is pressed against the surface of the heat exchanger, and the second matching surface is attached to the Dewar flask. According to the refrigerator, the flexible filling layer is arranged on the refrigerator, when the refrigerator is assembled with the Dewar, the refrigerator is simple to assemble and high in assembly precision, and can be effectively matched with a gap between the heat exchanger and the Dewar, so that the gap is filled, the Dewar and the heat exchanger are protected, and the Dewar and the heat exchanger are prevented from being damaged; and moreover, the precision requirement on the winding process of the heat exchanger can be greatly reduced, so that the yield of the throttling refrigerator and the detector is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of throttling refrigeration detectors, in particular to a throttling refrigeration component and a detector. Background Art

[0002] The throttling cooler can cool down the high-pressure working fluid through the small hole to produce the throttling effect, and use the counterflow channel for heat exchange and refrigeration cycle to obtain the low temperature of the liquid phase of the refrigerant, and cool the detector cold head chip to the corresponding temperature. The gap between the cooler and the dewar constitutes the counterflow channel of the refrigerant, which plays a key role in the heat exchange of the refrigeration component and directly affects the performance of the refrigeration component.

[0003] The counterflow channel is determined by the coupling between the cooler and the cold finger of the dewar. The smaller the coupling gap, the better the heat exchange effect of the counterflow channel, but the more difficult it is to assemble. Due to the influence of manual operation factors during the manufacturing process of the cooler, the actual appearance of the cooler will deviate, and it is difficult to ensure the consistency of the coupling gap. If the gap is too large, the performance of the cooler will be significantly reduced. If the gap is too small, it will be difficult for the cooler to couple with the dewar, and it may even crush the cold finger of the dewar, destroy the vacuum of the dewar, and make the detector scrapped.

[0004] In the existing refrigerator manufacturing process, due to the influence of the manufacturing process, there will be local differences in the gaps between different refrigerators and the same Dewar cold finger. Usually, nylon wire is wound between the heat exchangers of the refrigerator, but there are the following problems: 1) The nylon wire is relatively thin, usually at the level of more than ten microns, with a small elastic margin and a small range of gaps that can be filled. The coupling gap between the throttling refrigerator and the Dewar is at the micron level. Due to the irregular shape of the refrigerator heat exchanger, it is easy for a local heat exchanger to press the Dewar cold finger during assembly, and the local heat exchanger is too far away from the Dewar cold finger. The former is easy to cause damage to the cold finger and scrap the Dewar, and the latter will cause the performance of the heat exchanger to decline; 2) The reliability of the nylon wire is poor. There are cases of misalignment, falling off or even complete looseness during the actual assembly process, which seriously affects the use of the refrigerator; 3) It is difficult to wind the nylon wire around the irregular fin tube heat exchanger, and there are many uncontrollable factors in the process. It needs to be manually made by experienced workers, and the appearance and performance of the finished product are difficult to control. Utility Model Content

[0005] In order to solve the above problems, on the one hand, the utility model provides a throttling refrigeration component, including a refrigerator and a dewar coupled to each other, the refrigerator including a core shaft and a heat exchanger, the heat exchanger is wound on the core shaft, and also includes a filling layer sandwiched between the dewar and the heat exchanger, the filling layer is made of flexible material and has a first mating surface pressed against the surface of the heat exchanger and a second mating surface fitted with the dewar.

[0006] Furthermore, the filling layer is made of porous flexible material.

[0007] Furthermore, the packing layer is pre-tightened between the heat exchanger and the Dewar, the original porosity of the packing layer is 50% to 95%, and the porosity of the packing layer after pre-tightening is no more than 5%.

[0008] Furthermore, the filling layer is a hollow frustum; the inner wall of the filling layer forms the first mating surface, and the outer wall of the filling layer forms the second mating surface.

[0009] Furthermore, a mounting portion is provided at one end of the filling layer, and the mounting portion is connected to the refrigerator flange.

[0010] Furthermore, a mounting hole is provided on the mounting portion, and the mounting portion is detachably connected to the refrigerator through the mounting hole.

[0011] Furthermore, the filling layer is an integrated structure.

[0012] Furthermore, the refrigerator further comprises an air inlet flange, the core shaft is arranged on the air inlet flange, and the heat exchanger is wound around the outside of the core shaft in a single helix or a double helix.

[0013] Furthermore, the heat exchanger is a partition type heat exchanger.

[0014] On the other hand, the utility model further provides a detector, comprising the throttling refrigeration assembly as described above.

[0015] Due to the adoption of the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0016] 1) The throttling refrigeration component provided by the utility model is provided with a flexible filling layer on the refrigerator. When assembled with the dewar, the assembly is simple and accurate. The gap between the heat exchanger and the dewar can be effectively matched so that the gap can be filled, thereby protecting the dewar and the heat exchanger and avoiding damage to the dewar and the heat exchanger. The accuracy requirements for the winding process of the heat exchanger can be greatly reduced, thereby greatly improving the yield of the throttling refrigerator and the detector.

[0017] 2) The throttling refrigeration component provided by the utility model has a filling layer made of porous flexible material, which is assembled with the Dewar. The gap between the heat exchanger and the Dewar is fully filled, and the second mating surface is in contact with the Dewar. The porous medium will not hinder the flow of the backflow gas, thereby ensuring sufficient heat exchange between the backflow working fluid and the heat exchanger, and will not affect the refrigerator, thereby improving the yield of the detector. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the structure of the throttling refrigeration assembly provided by the utility model;

[0020] Figure 2 An exploded view of the throttling refrigeration assembly provided by the utility model;

[0021] Figure 3 This is a schematic diagram of a filling layer in a throttling refrigerator provided by the utility model.

[0022] 1-refrigerator; 11-heat exchanger; 12-inlet flange; 13-core shaft; 2-filling layer; 21-first mating surface; 22-second mating surface; 23-installation part; 24-avoidance hole; 25-installation hole; 3-Dewar; 31-Dewar cold finger. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. In the drawings, the size and relative size of some parts may be enlarged for clarity.

[0024] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connection" and "connected" should be interpreted in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the description of the present invention, terms such as "upper", "lower", "left", "right", "front", "backward", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In addition, in the description of the present invention, the terms "first" and "second" are only used to distinguish in the description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0027] Example 1

[0028] As the instruction manual Figure 1-3 As shown, the utility model provides a throttling refrigeration component, including a coupled refrigerator 1 and a dewar 3, the refrigerator 1 including a core shaft 13 and a heat exchanger 11, the heat exchanger 11 is wound on the core shaft 13, and also includes a filling layer 2 sandwiched between the dewar 3 and the heat exchanger 11, the filling layer 2 is made of flexible material, and has a first mating surface 21 pressed against the surface of the heat exchanger 11 and a second mating surface 22 in contact with the dewar 3.

[0029] Specifically, a flexible filling layer 2 is installed on the refrigerator 1. The filling layer 2 has a certain elasticity and can be squeezed under the action of external force, and return to its original state after the external force disappears; the filling layer 2 is installed on the outside of the heat exchanger 11 and fits with the inner Dewar cold finger 31 of the Dewar 3. On the one hand, it can protect the heat exchanger 11 and the Dewar cold finger 31, and on the other hand, it can reduce the precision requirements for the winding process of the heat exchanger 11. In actual products, the size of the outer envelope of the heat exchanger 11 is difficult to control accurately. If it is slightly loose during the winding process, the gap with the Dewar cold finger 31 will be too small, or even interference will occur, which will affect the performance at the least and crush the Dewar cold finger 31 at the worst, causing the detector to be scrapped. If the winding is too tight, the gap between the heat exchanger 11 and the Dewar cold finger 31 will be too large, and the backflow gas cannot fully exchange heat, causing cold loss and affecting performance. After the filling layer 2 is set on the outside of the heat exchanger 11, the precision requirements for the heat exchanger winding process can be reduced. After the refrigerator and the Dewar 3 are assembled, the gap between the heat exchanger 11 of the refrigerator 1 and the Dewar cold finger 31 can be filled. The first mating surface 21 and the second mating surface 22 are respectively set according to the heat exchanger 11 and the Dewar cold finger 31, and are adapted to the heat exchanger 11 and the Dewar cold finger 31.

[0030] In an optimized implementation mode, the filling layer 2 is made of flexible material, which can be highly elastic rubber, silicone or other flexible materials. The flow of the working medium after coupling is controlled by the compressible amount, and the value of the compressible amount depends on the structural size of the refrigerator 1, and the compressible amount is generally 50%-95%; preferably, the filling layer 2 is made of porous flexible material, including but not limited to porous cotton, foamed plastic, etc., whose porosity is adapted to the refrigerator 1 and has a certain heat insulation effect, and is heat-insulated from the surface of the Dewar 3 to reduce losses. The flow of the working medium after coupling is controlled by its porosity, and the value of the porosity depends on the structural size of the refrigerator 1. The original porosity ranges from 50%-95%, ensuring that the porosity after the coupling assembly of the refrigerator 1 and the Dewar 3 is less than 5%, so that the counterflow channel is completely established between the finned tubes of the heat exchanger, and the working medium cannot flow out axially along the wall of the Dewar 3.

[0031] In an optimized implementation manner, the filling layer 2 is a hollow cone, and a cavity adapted to the heat exchanger 11 is provided inside the filling layer 2; the inner wall of the filling layer 2 forms the first matching surface 21, and the outer wall of the filling layer 2 forms the second matching surface 22.

[0032] Preferably, a mounting portion 23 is provided at one end of the filling layer 2, and the mounting portion 23 is flange-connected to the refrigerator 1; the mounting portion 23 is arranged at the larger end of the filling layer 2, and a avoidance hole 24 is opened at the smaller end of the filling layer 2 for making way for the top pipe of the heat exchanger 11. An expansion cavity is formed between the smaller end of the filling layer 2 and the Dewar cold finger 31, and the expansion cavity is used for throttling the refrigerant to generate cold. The size of the expansion cavity is set according to demand.

[0033] The filling layer 2 is provided with a mounting portion 23, and the refrigerator 1 also includes an air inlet flange 12, and the mounting portion 23 is detachably connected to the air inlet flange 12 of the refrigerator 1; preferably, mounting holes 25 are respectively provided on the mounting portion 23 and the air inlet flange 12, and the mounting holes 25 on the mounting portion 23 are arranged one-to-one with the mounting holes 25 on the air inlet flange 12, and the filling layer 2 can be fixed on the refrigerator 1 by fasteners; the fasteners can be screws or bolts, etc.

[0034] Of course, the mounting portion 23 may also be bonded to the air inlet flange 12 to achieve fixation of the filling layer 2 and the refrigerator 1 .

[0035] Preferably, the mounting portion 23 is a circular ring and is compatible with the mating surfaces of the air inlet flange 12 and the dewar 3. The side of the mounting portion 23 that contacts the air inlet flange 12 is a planar structure and contacts the surface of the air inlet flange 12. The side of the mounting portion 23 that contacts the dewar 3 is a planar structure and contacts the surface of the dewar 3. The mounting portion 23 fills the gap between the air inlet flange 12 and the dewar 3 and can play a certain sealing role, so that after the refrigerator 1 is coupled with the dewar 3, the internal chamber is isolated from the external atmospheric environment, and at the same time, water vapor in the atmosphere is prevented from entering the refrigerator 1 and causing the throttle hole to be blocked.

[0036] In an optimized implementation mode, the filling layer 2 is an integrated structure; the filling layer 2 is easy to install and disassemble.

[0037] In an optimized implementation mode, the heat exchanger 11 is a partition-type heat exchanger, preferably a fin-tube heat exchanger; the filling layer is pre-tightened between the heat exchanger and the Dewar, and the second mating surface is in contact with the Dewar cold finger, so that the backflow flows through the channel formed by the fins of the fin tube as much as possible, thereby effectively utilizing the heat exchange area and improving the heat exchange efficiency.

[0038] A filling layer 2 is filled between the refrigerator 1 and the Dewar 3. Firstly, it can protect the heat exchanger 11 and the Dewar 3 and prevent damage to the heat exchanger 11 and the Dewar 3. Secondly, the margin of the gap between the refrigerator body 1 and the Dewar 3 can be increased at the design end, which can reduce the assembly accuracy, improve the yield, reduce the risk of manual operation, facilitate automated production, and be more efficient and reliable. Thirdly, the gap between the heat exchanger 11 and the Dewar cold finger 31 is fully filled, and the porous medium will not hinder the flow of the backflow gas. The second mating surface 22 of the filling layer 2 is in contact with the Dewar cold finger 31, so that the backflow gas flows along the wall of the fin-tube heat exchanger 11, which can still ensure sufficient heat exchange between the backflow medium and the heat exchanger 11, without affecting the performance of the refrigerator, thereby improving the yield of the detector.

[0039] In an optimized implementation manner, the refrigerator 1 comprises an air inlet flange 12 , the core shaft 13 is arranged on the air inlet flange 12 , and the heat exchanger 11 is wound around the outside of the core shaft 13 in a single helix or a double helix.

[0040] In an optimized implementation mode, the refrigerator 1 is detachably connected to the Dewar 3, and the Dewar 3 is preferably a vacuum Dewar. In practical applications, the refrigerator 1 and the Dewar 3 can be connected by bolts or screws, and the filling layer 2 is filled between the refrigerator 1 and the Dewar cold finger 31, and the shape and size of the Dewar cold finger 31 match the refrigerator 1. After the refrigerator 1 and the Dewar 3 are assembled, the filling layer 2 is pre-tightened between the refrigerator 1 and the Dewar cold finger 31.

[0041] Example 2

[0042] The utility model also provides a detector, comprising the throttling refrigeration component as described in Example 1.

[0043] Preferably, the chip of the detector is arranged in the vacuum chamber of the Dewar.

[0044] In summary, the utility model provides a throttling refrigeration component and a detector. The throttling refrigeration component includes a refrigerator and a vacuum dewar. The heat exchanger 11 is preferably a fin-tube heat exchanger. The heat exchanger 11 and the dewar cold finger 31 are coupled and assembled. The assembly gap between the heat exchanger 11 and the dewar cold finger 31 is the reflux channel of the working medium outflow detector. During the outflow process, the fluid inside and outside the fin-tube heat exchanger exchanges heat, so that the working medium in the tube is cooled down; the filling layer 2 adopts a loose and porous flexible element, which fills the gap between the heat exchanger 11 and the dewar cold finger 31. The second mating surface 22 fits the dewar cold finger 31. While protecting the heat exchanger 11 and the dewar 3 from damage, it will not hinder the flow of reflux gas, and can still ensure sufficient heat exchange between the reflux working medium and the fin-tube heat exchanger. The filling layer 2 adopts a porous element, and the porosity matches the requirements of the refrigerator 1, which can optimize the flow resistance outside the fin-tube heat exchanger, enhance the heat exchange of the fluid inside and outside the fin-tube heat exchanger, and thus improve the refrigeration performance of the refrigerator.

[0045] Those skilled in the art will appreciate that the present invention can be implemented in many other specific forms without departing from the spirit and scope of the present invention. Although the embodiments of the present invention have been described, it should be understood that the present invention should not be limited to this embodiment, and those skilled in the art can make changes and modifications within the spirit and scope of the present invention as defined by the attached claims.

Claims

1. A throttling refrigeration assembly, comprising a coupled refrigerator and a dewar, wherein the refrigerator comprises a mandrel and a heat exchanger, and the heat exchanger is wound on the mandrel, characterized in that: It also includes a filling layer sandwiched between the Dewar and the heat exchanger. The filling layer is made of flexible material and has a first matching surface pressed against the surface of the heat exchanger and a second matching surface in contact with the Dewar.

2. The throttling refrigeration assembly according to claim 1, characterized in that: The filling layer is made of porous flexible material.

3. The throttling refrigeration assembly according to claim 2, characterized in that: The packing layer is pre-tightened between the heat exchanger and the Dewar, the original porosity of the packing layer is 50% to 95%, and the porosity of the packing layer after pre-tightening is not greater than 5%.

4. The throttling refrigeration assembly according to claim 1, characterized in that: The filling layer is a hollow truncated cone; the inner wall of the filling layer forms the first matching surface, and the outer wall of the filling layer forms the second matching surface.

5. The throttling refrigeration assembly according to claim 1, characterized in that: A mounting portion is provided at one end of the filling layer, and the mounting portion is connected to the refrigerator flange.

6. The throttling refrigeration assembly according to claim 5, characterized in that: The mounting portion is provided with a mounting hole, and the mounting portion is detachably connected to the refrigerator through the mounting hole.

7. The throttling refrigeration assembly according to claim 1, characterized in that: The filling layer is an integrated structure.

8. The throttling refrigeration assembly according to claim 1, characterized in that: The refrigerator further comprises an air inlet flange, the core shaft is arranged on the air inlet flange, and the heat exchanger is wound around the outside of the core shaft in a single helix or a double helix.

9. The throttling refrigeration assembly according to claim 1, characterized in that: The heat exchanger is a partition type heat exchanger.

10. A detector, characterized in that: It comprises a throttling refrigeration component as described in any one of claims 1 to 9.

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