Sleeve type heat regenerator structure of pulse tube refrigerator

Abstract

The utility model relates to the technical field of pulse tube refrigerators, and particularly provides a sleeve type heat regenerator structure of a pulse tube refrigerator. Wherein the sleeve type heat regenerator structure comprises a first-stage heat regenerator pipe wall, a second-stage heat regenerator pipe wall, a first-stage cold end copper block, a first-stage heat exchanger and a first sleeve structure, and a first mounting cavity penetrating in the axis direction is formed in the first-stage heat regenerator pipe wall; a second mounting cavity is formed in the pipe wall of the second-stage heat regenerator in the axial direction in a penetrating manner; the first-stage cold end copper block is connected with the outer side walls of the adjacent ends of the first-stage heat regenerator pipe wall and the second-stage heat regenerator pipe wall, and a communicating channel communicating with the first mounting cavity and the second mounting cavity is formed in the first-stage cold end copper block. The primary heat exchanger is detachably arranged in the communicating channel; the first sleeve structure is assembled in the first mounting cavity in an interference mode, and a first containing cavity is formed in the first sleeve structure and used for containing the first-stage cold storage filler. The cold accumulation packing of the heat regenerator of the pulse tube refrigerator can be quickly disassembled, assembled and replaced.

Description

TECHNICAL FIELD

[0001] The utility model relates to pulse tube refrigerator technical field especially pulse tube refrigerator's bushing type regenerator structure of a kind of. BACKGROUND

[0002] Pulse tube refrigerator is gradually replacing GM refrigerator to become the most widely used small cryogenic refrigerator in practical application because of the cold head without moving parts, with low vibration, high reliability and long life and many advantages. Pulse tube refrigerator usually needs multi-stage structure to obtain lower refrigeration temperature. Currently, commercial liquid helium temperature zone pulse tube refrigerator adopts two-stage gas coupling structure, and is widely used in quantum computing, condensed matter physics research and other fields.

[0003] As the key core component of pulse tube refrigerator, regenerator not only plays the role of cold storage and heat recovery, but also is an important place for work gas power heat conversion, and its quality directly determines the refrigeration performance and service life of pulse tube refrigerator. In the prior art, after the refrigerator is integrally welded, the filling of the second-stage regenerator and the first-stage regenerator is sequentially performed, and the cold storage filler is directly filled in the regenerator pipe wall. The cold storage filler of the second-stage regenerator mainly includes metal particles of different particle sizes such as Lead, Er3Ni and HoCu2, and the cold storage filler of the first-stage regenerator mainly includes stainless steel wire mesh and copper mesh of different mesh numbers. After the assembly of the refrigerator is completed, the refrigerator is usually integrated into a low-temperature scientific instrument or a dilution refrigerator to realize more complex system functions.

[0004] After long-term operation of the refrigerator, the particle type cold storage filler is continuously subjected to high and low pressure washing by working gas, and is prone to breakage, which may cause blockage of the regenerator. The wire mesh type cold storage filler is also prone to various contaminations brought by working gas, thereby reducing the heat recovery efficiency. Or when the cold storage filler itself has quality problems, these factors will significantly deteriorate the refrigeration performance of the refrigerator.

[0005] In the prior art, problems of the regenerator of the refrigerator will directly affect the performance of the refrigerator, and more seriously, will directly affect the service life of the refrigerator, and the cold storage filler needs to be completely removed and replaced. Most users pay more attention to the second-stage refrigeration performance during use of the refrigerator, and the particle type cold storage filler in the second-stage regenerator is more prone to problems. At this time, the wire mesh type cold storage filler in the first-stage regenerator needs to be removed first, then the particle type cold storage filler in the second-stage regenerator needs to be removed, and finally the second-stage regenerator and the first-stage regenerator need to be sequentially refilled. For low-temperature scientific instruments and dilution refrigerator systems, the pulse tube refrigerator needs to be completely removed from the system when the cold storage filler of the regenerator has problems, which often requires a lot of time and effort. UTILITY MODEL CONTENTS

[0006] The utility model provides a kind of double-pipe regenerator structure of pulse tube refrigerator, to solve the defect that when needing to replace cold storage filler in prior art, the refrigerator in whole system must be removed first, and according to order, cold storage filler in first regenerator is removed before removing second regenerator, this process is complex and time-consuming, increase maintenance cost and downtime, realize the quick disassembly and replacement of refrigerator regenerator cold storage filler.

[0007] The utility model provides a kind of double-pipe regenerator structure of pulse tube refrigerator, comprising:

[0008] First regenerator pipe wall, first installation cavity is formed in the first regenerator pipe wall along the direction of axis and penetrates;

[0009] Second regenerator pipe wall, the second regenerator pipe wall is coaxial with the first regenerator pipe wall and is arranged with mutual spacing, second installation cavity is penetrated in the second regenerator pipe wall along the direction of axis;

[0010] First cold end copper block, the first cold end copper block is connected with the outer side wall of adjacent end of the first regenerator pipe wall and the second regenerator pipe wall respectively, and the first cold end copper block is equipped with the communication passage that communicates the first installation cavity and the second installation cavity;

[0011] First heat exchanger, the first heat exchanger is detachably arranged in the communication passage;

[0012] First sleeve structure, the first sleeve structure is assembled in the first installation cavity with interference, first containing cavity is formed in the first sleeve structure, and the containing cavity is used to place first cold storage filler.

[0013] According to the double-pipe regenerator structure of pulse tube refrigerator provided by the utility model, the first sleeve structure includes first sleeve and room temperature end heat exchanger, one end of the first sleeve is provided with first opening away from the second regenerator, the first opening is communicated with the first containing cavity, and the room temperature end heat exchanger is blocked at the first opening.

[0014] According to the double-pipe regenerator structure of pulse tube refrigerator provided by the utility model, first connecting hole is equipped on the outer side wall of one end of the first sleeve close to the first opening, second connecting hole is equipped at the position corresponding to the first connecting hole of the room temperature end heat exchanger, and the first sleeve is connected and fixed with the room temperature end heat exchanger by fastener through the first connecting hole and the second connecting hole.

[0015] According to the double-pipe regenerator structure of pulse tube refrigerator provided by the utility model, thread hole is opened on the side of the room temperature end heat exchanger away from the first sleeve, and the thread hole is used to cooperate bolt to take out the first sleeve structure from the first installation cavity.

[0016] According to the sleeve type regenerator structure of the pulse tube refrigerator, the first sleeve is provided with a cold end vent hole at an end portion close to one end of the primary heat exchanger, and the room temperature end heat exchanger is provided with a hot end vent hole, and the cold end vent hole and the hot end vent hole are communicated with the first containing cavity.

[0017] According to the sleeve type regenerator structure of the pulse tube refrigerator, an annular sealing groove is formed in the outer wall of the first sleeve, and the sleeve type regenerator structure of the pulse tube refrigerator comprises a sealing element, the sealing element is arranged in the sealing groove, and abuts between the inner wall surface of the first mounting cavity and the outer surface of the first sleeve structure.

[0018] According to the sleeve type regenerator structure of the pulse tube refrigerator, the primary regenerator pipe wall, the primary cold end copper block and the secondary regenerator pipe wall are integrally connected.

[0019] According to the sleeve type regenerator structure of the pulse tube refrigerator, the sleeve type regenerator structure of the pulse tube refrigerator further comprises a second sleeve structure, the second sleeve structure is interference fitted in the second mounting cavity, the second sleeve structure has a second containing cavity and a second opening communicated with the second containing cavity, the second containing cavity is used for placing secondary regenerative filler, and the primary heat exchanger is blocked at the second opening.

[0020] The sleeve type regenerator structure of the pulse tube refrigerator provided by the utility model, through the first sleeve structure added in the primary regenerator pipe wall, when the secondary regenerative filler needs to be replaced, the operator only needs to pull out the first sleeve structure from the first mounting cavity of the primary regenerator pipe wall, and then take out the primary heat exchanger, so that the granular regenerative material in the second mounting cavity can be directly poured out of the refrigerator. This process does not need to disassemble the whole refrigerator or sequentially disassemble the regenerative fillers of multiple regenerators, greatly simplifies the replacement process, and realizes quick disassembly and replacement of the regenerative filler of the pulse tube refrigerator regenerator. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0022] Figure 1 It is a structure schematic view of one embodiment of the sleeve type regenerator structure of the pulse tube refrigerator provided by the utility model.

[0023] Figure 2 is another embodiment of the sleeve type regenerator structure of the pulse tube refrigerator provided by the utility model.

[0024] Reference signs:

[0025] 10, sleeve type regenerator structure of the pulse tube refrigerator;

[0026] 100, primary regenerator tube wall; 110, first mounting cavity;

[0027] 200, primary cold end copper block; 210, communication passage;

[0028] 300, primary heat exchanger;

[0029] 400, secondary regenerator tube wall; 410, second mounting cavity;

[0030] 500, first sleeve structure; 510, first sleeve; 511, first containing cavity; 512, first opening; 513, first connecting hole; 514, cold end air hole; 515, sealing groove; 520, room temperature end heat exchanger; 521, second connecting hole; 522, threaded hole; 523, hot end air hole;

[0031] 600, fastener;

[0032] 700, primary regenerator filler;

[0033] 800, secondary regenerator filler;

[0034] 900, room temperature end stainless steel flange. DETAILED DESCRIPTION

[0035] The embodiments of the utility model will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the utility model, but cannot be used to limit the scope of the utility model.

[0036] In the description of the embodiments of the utility model, it should be explained that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relationship based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the embodiments of the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0038] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0040] The following is combined Figures 1 to 2 The structure of the coaxial regenerator of the pulse tube refrigerator provided in this utility model embodiment will be described in detail through specific embodiments and application scenarios.

[0041] In the embodiments of this utility model, such as Figures 1 to 2As shown, the double-pipe regenerator structure 10 of the pulse tube refrigerator comprises a primary regenerator pipe wall 100, a secondary regenerator pipe wall 400, a primary cold end copper block 200, a primary heat exchanger 300 and a first double-pipe structure 500. The first installation cavity 110 is formed in the primary regenerator pipe wall 100 and penetrates along the axial direction. The secondary regenerator pipe wall 400 is coaxial with the primary regenerator pipe wall 100 and is arranged at intervals. The second installation cavity 410 is formed in the secondary regenerator pipe wall 400 and penetrates along the axial direction. The primary cold end copper block 200 is connected to the outer side wall of the adjacent end of the primary regenerator pipe wall 100 and the secondary regenerator pipe wall 400. The communication passage 210 is arranged in the primary cold end copper block 200 and communicates the first installation cavity 110 and the second installation cavity 410. The primary heat exchanger 300 is detachably arranged in the communication passage 210. The first double-pipe structure 500 is interference-fitted in the first installation cavity 110. The first containing cavity 511 is formed in the first double-pipe structure 500 and is used for placing the primary regenerator filler 700.

[0042] The primary regenerator pipe wall 100 is the basic part of the double-pipe regenerator structure. It provides a closed space, i.e. the first installation cavity 110, for installing and fixing the first double-pipe structure 500. The installation cavity penetrates the entire primary regenerator pipe wall 100 along the axial direction, ensuring that the working gas can flow smoothly therein and exchange heat with the regenerator filler.

[0043] The secondary regenerator pipe wall 400 is coaxial with the primary regenerator pipe wall 100 and is arranged at intervals, forming an independent heat exchange area. In the secondary regenerator pipe wall 400, a second installation cavity 410 also penetrates along the axial direction. The second installation cavity 410 is used for containing the secondary regenerator filler 800 or as a channel for secondary heat exchange.

[0044] The primary cold end copper block 200 is connected to the outer side wall of the adjacent end of the primary regenerator pipe wall 100 and the secondary regenerator pipe wall 400. This connection not only enhances the overall stability of the refrigerator structure, but also realizes the distribution of working gas volume between the two regenerators through the communication passage 210 in the primary cold end copper block 200 and the primary heat exchanger 300.

[0045] The primary heat exchanger 300 is designed to be detachably arranged in the communication passage 210. The primary heat exchanger 300 mainly functions to further cool the working gas and improve the refrigeration efficiency, while also serving to distribute the working gas volume between the two regenerators.

[0046] The first sleeve structure 500 is interference-fitted into the first mounting cavity 110 of the first-stage regenerator tube wall 100 to ensure good sealing and thermal insulation. Within the sleeve structure, a first receiving cavity 511 is formed for placing the first-stage cold storage packing 700. This effectively encapsulates the cold storage packing within the sleeve, facilitating subsequent disassembly and replacement.

[0047] It should be noted that in this application, the primary cold storage filler 700 is stainless steel wire mesh and copper mesh of different mesh sizes, and the secondary cold storage filler 800 is metal particles such as Lead, Er3Ni and HoCu2 of different particle sizes.

[0048] This application adds a first sleeve structure 500 inside the tube wall 100 of the first-stage regenerator. When the first-stage cold storage packing 700 needs to be replaced, the operator only needs to pull the first sleeve structure 500 out of the first mounting cavity 110 of the tube wall 100 of the first-stage regenerator, and then remove the first-stage heat exchanger 300. The granular cold storage material in the second mounting cavity 410 can then be directly poured out of the refrigerator. This process does not require dismantling the entire refrigerator or sequentially removing the cold storage packing of multiple regenerators, greatly simplifying the replacement process and enabling rapid disassembly, assembly, and replacement of the cold storage packing in the pulse tube refrigerator regenerator.

[0049] In one embodiment, the first sleeve 510 is made of a non-metallic material, which can significantly reduce heat leakage between the working gas, the cold storage packing, and the regenerator tube wall, thereby improving heat exchange efficiency. Specifically, the non-metallic material includes polytetrafluoroethylene, epoxy resin, fiberglass, etc.

[0050] Reference Figure 1 According to the present invention, a sleeve-type regenerator structure 10 for a pulse tube refrigerator is provided. The first sleeve structure 500 includes a first sleeve 510 and a room temperature end heat exchanger 520. The first sleeve 510 is provided with a first opening 512 at the end away from the secondary regenerator. The first opening 512 is connected to the first receiving cavity 511. The room temperature end heat exchanger 520 is sealed at the first opening 512.

[0051] Understandably, the first sleeve 510 provides a closed containment space for the primary cold storage packing 700, while also serving as a channel for gas flow. The first sleeve 510 is located within the first mounting cavity 110, and its design allows the cold storage packing to be installed or replaced as a whole. One end of it is provided with a first opening 512, which communicates with the first receiving cavity 511, allowing the cold storage packing to be placed or removed.

[0052] The first opening 512 provides access to the first receiving cavity 511, allowing the cold storage packing to be easily installed or replaced. The first opening 512 is located at the end of the first sleeve 510 furthest from the secondary regenerator and communicates with the first receiving cavity 511.

[0053] The room temperature end heat exchanger 520 plays a dual role of plugging and heat exchange in the first sleeve structure 500. The room temperature end heat exchanger 520 is plugged at the first opening 512, which not only pluggs the first storage cavity 511 containing the first-stage regenerative material, but also better transfers the heat from the low-temperature end to the environment as part of the heat exchange. While ensuring the integrity of the thermodynamic cycle of the pulse tube refrigerator, it also provides convenience for replacing the regenerative filler.

[0054] Referring to Figure 1 and Figure 2 According to the sleeve type regenerator structure 10 of the pulse tube refrigerator provided by the utility model, the first sleeve 510 is provided with a first connecting hole 513 on the outer side wall of the end close to the first opening 512, and the room temperature end heat exchanger is provided with a second connecting hole 521 corresponding to the position of the first connecting hole 513. The first sleeve 510 and the room temperature end heat exchanger are fixed and connected through the fastener 600 passing through the first connecting hole 513 and the second connecting hole 521.

[0055] It can be understood that the first connecting hole 513 is located on the outer side wall of the end of the first sleeve 510 close to the first opening 512, which provides a mechanical connection point for fixing the first sleeve 510 and the room temperature end heat exchanger 520 together. The design of the first connecting hole 513 allows the fastener 600 (such as a bolt, a screw or a screw rod, etc.) to pass through, so as to realize the mechanical connection of the first sleeve 510 and the room temperature end heat exchanger 520. It is ensured that the sleeve structure can remain stable during the operation of the refrigerator and will not be displaced due to vibration or other external forces.

[0056] The second connecting hole 521 is located on the room temperature end heat exchanger 520 and corresponds to the first connecting hole 513 of the first sleeve 510, which is also a hole position for mechanical connection. The existence of the second connecting hole 521 allows the fastener 600 to pass through the room temperature end heat exchanger 520 and the first sleeve 510, and completes the fixed connection of the two. The corresponding design ensures the accuracy and reliability of the connection.

[0057] Of course, in other embodiments, a plurality of first connecting holes can be arranged along the circumferential direction of the end of the first sleeve 510 close to the first opening 512, and the corresponding room temperature end heat exchanger is provided with a plurality of second connecting holes 521, which are not specially limited here.

[0058] The fastener 600 (such as a bolt, a screw, etc.) is used to pass through the first connecting hole 513 and the second connecting hole 521 to tightly connect and fix the first sleeve 510 and the room temperature end heat exchanger 520. The use of the fastener 600 provides the necessary clamping force to ensure that the connection between the first sleeve 510 and the room temperature end heat exchanger 520 is firm and will not leak or loosen due to temperature changes or vibration during the refrigeration process.

[0059] Referring to Figure 1 and Figure 2 According to the sleeve type regenerator structure 10 of the pulse tube refrigerator provided by the utility model, the room temperature end heat exchanger is provided with a threaded hole 522 on the side away from the first sleeve 510, and the threaded hole 522 is used for cooperating with a bolt to take out the first sleeve structure 500 from the first installation cavity 110.

[0060] It can be understood that the threaded hole 522 is located on the side of the room temperature end heat exchanger away from the first sleeve 510, which provides a mechanical operation interface for taking out the first sleeve structure 500 from the first installation cavity 110 when the regenerative filler is maintained or replaced. The threaded hole 522 is internally provided with threads, which can cooperate with the threads of the bolt to form a reliable locking mechanism.

[0061] When the regenerative filler needs to be replaced, the operator can screw the bolt into the threaded hole 522, and the first sleeve structure 500 is smoothly pulled out of the first installation cavity 110 through the axial force generated by rotating the bolt. In this way, damage or deformation caused by directly applying force to the sleeve structure can be avoided.

[0062] Referring to Figure 1 According to the sleeve type regenerator structure 10 of the pulse tube refrigerator provided by the utility model, the first sleeve 510 is provided with a cold end air hole 514 at the end close to the one end of the primary heat exchanger 300, and the room temperature end heat exchanger is provided with a hot end air hole 523, and the cold end air hole 514 and the hot end air hole 523 are in communication with the first containing cavity 511.

[0063] It can be understood that the cold end air hole 514 is located at the end of the first sleeve 510 close to the one end of the primary heat exchanger 300, so as to allow gas to flow into or out of the first sleeve 510 from the primary heat exchanger 300 in the refrigeration cycle.

[0064] The cold end air hole 514 ensures that the refrigerator gas can flow between the primary heat exchanger 300 and the first sleeve 510 to achieve effective heat exchange.

[0065] The cold end air hole 514 is in communication with the first containing cavity 511, so that the gas can flow in the regenerative filler, thereby storing and releasing heat by using the heat capacity of the filler.

[0066] The hot end air hole 523 is located on the room temperature end heat exchanger, which allows gas to flow into or out of the room temperature end heat exchanger 520 from the first sleeve 510 in the refrigeration cycle.

[0067] The hot end air hole 523 ensures that the refrigerator gas can flow between the first sleeve 510 and the room temperature end heat exchanger 520.

[0068] The hot end vent hole 523 is in communication with the first containing cavity 511, so that the gas can form a continuous flow path in the entire regenerator, improving the heat exchange efficiency.

[0069] With reference to Figure 1 According to the sleeve type regenerator structure 10 of the pulse tube refrigerator, the annular sealing groove 515 is arranged on the outer wall of the first sleeve 510, the sleeve type regenerator structure 10 of the pulse tube refrigerator comprises a sealing piece, the sealing piece is arranged around the sealing groove 515, and abuts between the inner wall surface of the first mounting cavity 110 and the outer side surface of the first sleeve structure 500.

[0070] It can be understood that the annular sealing groove 515 is arranged on the outer wall of the first sleeve 510. The sealing piece provides a mounting position to ensure the sealing between the first sleeve 510 and the first mounting cavity 110.

[0071] The sealing piece is arranged around the sealing groove 515 and abuts between the inner wall surface of the first mounting cavity 110 and the outer side surface of the first sleeve structure 500. The sealing piece is usually made of elastic material, such as rubber or silicone, and has good elasticity and sealing performance.

[0072] The main function of the sealing piece is to prevent the working gas from leaking from the gap between the first sleeve 510 and the first mounting cavity 110. During the operation of the pulse tube refrigerator, the direct heat exchange between the cold end and the hot end working gas is prevented, and the refrigeration capacity is lost.

[0073] In some embodiments, the primary regenerator tube wall 100, the primary cold end copper block 200 and the secondary regenerator tube wall 400 are integrally connected.

[0074] It can be understood that the integral connection means that the primary regenerator tube wall 100, the primary cold end copper block 200 and the secondary regenerator tube wall 400 are integrally connected together by a welding process to form a relatively stable overall structure. The mechanical strength, heat conduction efficiency and air tightness of the structure of the pulse tube refrigerator itself are improved.

[0075] In some embodiments, the sleeve type regenerator structure 10 of the pulse tube refrigerator further comprises a second sleeve structure, the second sleeve structure is interference fitted in the second mounting cavity 410, the second sleeve structure has a second containing cavity and a second opening in communication with the second containing cavity, the second containing cavity is used for placing the secondary regenerator filler 800, and the primary heat exchanger 300 is blocked at the second opening.

[0076] It can be understood that, similar to the design of the first sleeve structure 500, the second sleeve structure makes the replacement of the secondary regenerator filler 800 more convenient. Through the interference fit, it can be stably installed in the second mounting cavity 410, and it is convenient to quickly disassemble and reinstall, simplifying the maintenance process.

[0077] The second sleeve structure is made of non-metallic material, effectively reducing the heat leakage between the working gas, the cold storage filler and the regenerator pipe wall, and improving the heat exchange efficiency. The sealing groove 515 can be arranged on the second sleeve structure to ensure that the cold and hot end working gases do not mix, avoiding temperature control instability, heat leakage and other problems.

[0078] The second containing cavity provides a safe and stable storage space for the secondary cold storage filler 800 (such as metal particles of different particle sizes). When the secondary cold storage filler 800 needs to be replaced or cleaned, the second sleeve structure can be pulled out to directly pour or replace the filler therein, greatly simplifying the operation steps.

[0079] The second opening directly communicates with the second containing cavity, making the filling and replacement of the secondary cold storage filler 800 more convenient without complex disassembly steps.

[0080] The primary heat exchanger 300 serves as a plugging member to ensure the sealing of the cold storage filler inside the second sleeve structure, maintaining the pressure balance and temperature control of the system. The primary heat exchanger 300 not only plays a plugging role, but also serves as an important heat exchange component, and can effectively realize reasonable distribution of the refrigeration machine primary and secondary working gas, ensuring effective use of cold energy.

[0081] In summary, in the embodiment, by introducing the second sleeve structure and fitting it into the second installation cavity 410 with interference, the cold storage filler in the primary regenerator and the secondary regenerator of the pulse tube refrigerator can be quickly removed and replaced without pulling out the entire pulse tube refrigerator.

[0082] The utility model also provides a kind of cold storage filler replacement method of sleeve type regenerator structure 10 of pulse tube refrigerator as described above, and cold storage filler replacement method includes the following steps:

[0083] Use bolt to pull out the entire first sleeve structure 500 from the first installation cavity 110 by thread hole 522;

[0084] After removing the first sleeve structure 500, disassemble the screw rod, remove the room temperature end heat exchanger 520, and replace the primary cold storage filler 700 in the first containing cavity 511;

[0085] Remove the primary heat exchanger 300, and replace the secondary cold storage filler 800 in the second installation cavity 410;

[0086] After the secondary cold storage filler 800 in the second installation cavity 410 is replaced, the primary heat exchanger 300 is installed back into the communication passage 210;

[0087] The first sleeve structure 500 with the replaced first-stage regenerative filler 700 is interference-fitted into the first installation cavity 110.

[0088] In the replacement of the second-stage regenerative filler in the second installation cavity 410, it is determined whether the second sleeve structure is present,

[0089] If yes, the second sleeve structure is removed, and the second sleeve structure is replaced with the second-stage regenerative filler 800 in the second accommodating cavity;

[0090] If no, the second-stage regenerative filler 800 in the second installation cavity 410 is directly poured out of the refrigerator.

[0091] The room-temperature end stainless steel flange 900, the first-stage regenerator pipe wall 100, the first-stage cold-end copper block 200, the second-stage regenerator pipe wall 400 and the second-stage cold-end copper block (not shown in the figure) are integrally welded together.

[0092] Specifically, the first sleeve structure is pulled out of the first-stage regenerator pipe wall 100 by using bolts through the threaded holes 522, and the first-stage regenerator 300 is removed, and then the granular regenerative material in the second-stage regenerator can be directly poured out of the refrigerator. After the sleeve structure is removed, the screw rod is disassembled, and the room-temperature end regenerator 520 is removed, and the first-stage regenerative filler 700 in the first accommodating cavity 511 can be replaced. If the second sleeve structure is used in the second-stage regenerator, the second sleeve structure is pulled out of the second-stage regenerator pipe wall 400 by using the method of disassembling the first sleeve structure, so as to replace the second-stage regenerative filler 800 in the second accommodating cavity, without the need of disassembling the refrigerator for pouring, which can avoid the repeated disassembly and assembly of the refrigerator from more complex low-temperature scientific instruments and dilution refrigerators.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A coaxial regenerator structure for a pulse tube refrigerator, characterized in that, include: The first-stage regenerator tube wall has a first mounting cavity formed inside the tube wall along the axial direction; The secondary regenerator tube wall is coaxial with the primary regenerator tube wall and spaced apart from each other, and a second mounting cavity extends through the secondary regenerator tube wall along the axial direction. A primary cold-end copper block is provided, which is connected to the outer side wall of the adjacent ends of the primary regenerator tube wall and the secondary regenerator tube wall respectively. The primary cold-end copper block is provided with a connecting channel connecting the first mounting cavity and the second mounting cavity. A primary heat exchanger, wherein the primary heat exchanger is detachably disposed in the communicating channel; The first sleeve structure is interference-fitted into the first mounting cavity, and a first receiving cavity is formed inside the first sleeve structure for placing the first-stage cold storage packing.

2. The shell-and-tube regenerator structure of the pulse tube refrigerator according to claim 1, characterized in that, The first sleeve structure includes a first sleeve and a room temperature end heat exchanger. The first sleeve has a first opening at the end away from the secondary regenerator. The first opening communicates with the first receiving cavity. The room temperature end heat exchanger is sealed at the first opening.

3. The shell-and-tube regenerator structure of the pulse tube refrigerator according to claim 2, characterized in that, The first sleeve has a first connection hole on the outer wall near the first opening, and the room temperature heat exchanger has a second connection hole corresponding to the first connection hole. Fasteners are passed through the first connection hole and the second connection hole to connect and fix the first sleeve to the room temperature heat exchanger.

4. The shell-and-tube regenerator structure of the pulse tube refrigerator according to claim 2, characterized in that, The room temperature heat exchanger has a threaded hole on the side away from the first sleeve, and the threaded hole is used to fit a bolt to remove the first sleeve structure from the first mounting cavity.

5. The shell-and-tube regenerator structure of the pulse tube refrigerator according to claim 2, characterized in that, The first sleeve has a cold end vent hole at the end near the first stage heat exchanger, and the room temperature end heat exchanger has a hot end vent hole. Both the cold end vent hole and the hot end vent hole are connected to the first receiving cavity.

6. The shell-and-tube regenerator structure of the pulse tube refrigerator according to claim 5, characterized in that, An annular sealing groove is provided on the outer wall of the first sleeve. The sleeve-type regenerator structure of the pulse tube refrigerator includes a sealing element. The sealing element is arranged around the sealing groove and abuts against the inner wall surface of the first mounting cavity and the outer surface of the first sleeve structure.

7. The coaxial regenerator structure of the pulse tube refrigerator according to any one of claims 1-6, characterized in that, The primary regenerator tube wall, the primary cold-end copper block, and the secondary regenerator tube wall are integrally connected.

8. The coaxial regenerator structure of the pulse tube refrigerator according to any one of claims 1-6, characterized in that, The sleeve-type regenerator structure of the pulse tube refrigerator also includes a second sleeve structure. The second sleeve structure is interference-fitted into the second mounting cavity. The second sleeve structure has a second receiving cavity and a second opening communicating with the second receiving cavity. The second receiving cavity is used to place the secondary cold storage packing. The primary heat exchanger is sealed at the second opening.

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