Small rotating Stirling cryocooler heat regenerator spherical joint leak detection tool

Abstract

The invention discloses a leak detection tool for a spherical joint of a regenerator of a small rotary Stirling cryocooler, and relates to the technology of Tore cryocoolers, the leak detection tool comprises a first sealing element and a cylindrical structure, the specification of the inner wall of the first sealing element is matched with the access end of a second sealing element, and the top of the first sealing element is provided with a through hole; a slot is formed in the other side of the top of the first sealing element; one end of the second sealing piece is provided with a KF interface, the other end of the second sealing piece is provided with a sealing groove, and the sealing groove is used for being connected and installed with the spherical joint; the fourth sealing piece is of a sheet-shaped structure, a clamping opening is formed in the fourth sealing piece, and the fourth sealing piece is used for being inserted into the inserting groove so as to clamp the spherical joint through the clamping opening; and the third sealing piece is of a columnar structure and is used for being connected with one end, protruding out of the other side of the top of the first sealing piece, of the spherical joint. The Stirling cryocooler is used for solving the problem of process quality and product consistency of the Stirling cryocooler.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of Trane refrigerators, in particular to a leak detection tool for a spherical joint of a regenerator of a small rotary Stirling refrigerator. BACKGROUND

[0002] The rotary Stirling refrigerator is based on the Stirling refrigeration cycle principle, and uses a linear motor to drive the reciprocating compression and expansion cycle of the working gas between the compression end and the expansion end of the refrigerator to achieve the function of creating a low-temperature environment at the expansion end (the Dewar assembly coupled to the expansion end needs a low-temperature environment to work normally). The rotary Stirling refrigerator has the advantages of small size, compact structure, high efficiency, etc., and is widely used in infrared thermal imaging systems.

[0003] The rotary Stirling refrigerator is mainly composed of an expansion end and a compression end. The expansion end is connected to the regenerator by an expansion piston component, which converts the rotary motion generated by the power motor into linear reciprocating motion. The working gas in the Stirling refrigerator reciprocates between the expansion end and the compression end by shuttling in the regenerator component, continuously transferring the "cold energy" generated by the reverse Stirling cycle effect to the cold head at the expansion end, and providing a low-temperature working environment for the infrared imaging chip at the cold head position.

[0004] The structure of the rotary Stirling refrigerator and the regenerator component is shown in Figure 1 As an important component of the rotary refrigerator, the spherical joint needs to be sealed at the ball and socket joint. The joint gap has a sealing structure to maintain the working pressure of the working gas in the cavity. Therefore, sealing detection of this position is helpful to improve the reliability and consistency of the refrigerator product.

[0005] The spherical joint structure is too small and the surface structure of the joint parts is complex, making it difficult to test the sealing of this position. SUMMARY

[0006] The embodiment of the present application provides a leak detection tool for a spherical joint of a regenerator of a small rotary Stirling refrigerator, which solves the problems of Stirling refrigerator process quality and product consistency.

[0007] The embodiment of the present application provides a leak detection tool for a spherical joint of a regenerator of a small rotary Stirling refrigerator, which solves the problems of Stirling refrigerator process quality and product consistency. The first sealing member is a cylindrical structure, the inner wall specification of the first sealing member is adapted to the access end of the second sealing member, the top of the first sealing member is provided with a through hole for the spherical joint to extend to the other side of the top of the first sealing member, and the other side of the top of the first sealing member is provided with a slot. The second sealing member is provided with a KF interface at one end and a sealing groove at the other end, the sealing groove is used for connecting and installing with the spherical joint, and after the spherical joint is installed, the first sealing member is connected to the second sealing member, and the spherical joint protrudes through the through hole of the first sealing member. The fourth sealing member is in a sheet structure, and is provided with a bayonet, and is used for being inserted into the insertion slot to clamp the spherical joint by using the bayonet. The third sealing member is in a columnar structure, and is used for being connected with one end of the spherical joint protruding from the other side of the top of the first sealing member.

[0008] Optionally, the first sealing member is provided with a threaded structure on the inner wall of the cylindrical structure.

[0009] Optionally, the first sealing member is provided with a sealing groove structure at a position corresponding to the through hole on the top wall of the cylindrical structure, and the sealing groove structure is used for cooperating with a first sealing gasket to seal the spherical joint.

[0010] Optionally, the fourth sealing member is in a strip structure, and both ends of the fourth sealing member are provided with the bayonet.

[0011] Optionally, the third sealing member is provided with a threaded structure inside one end, is used for being connected with one end of the spherical joint protruding, and is provided with a tightening structure at the other end, and the tightening structure is used for cooperating with an external tool to realize tightening.

[0012] Optionally, the tightening structure is an internal hexagonal structure.

[0013] Optionally, the second sealing gasket is further included, and the second sealing gasket is used for being arranged at one end of the spherical joint protruding, and realizes sealing after the third sealing member is tightened.

[0014] Optionally, the spherical joint is further provided with a clamping part matched with the bayonet.

[0015] The plurality of sealing members are cooperated to solve the problem of multi-position sealing of small rotary Stirling cryogenic machine regenerator spherical joint surface complex small parts, simplify the number of tool parts, simplify the process operation, provide a practical and feasible scheme for the requirement of Stirling cryogenic machine regenerator spherical joint structure leak detection.

[0016] The above description is only a summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, the specific embodiments of the application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments with reference made to the accompanying drawings. The drawings are for purposes of illustration only and are not intended to limit the scope of the present application. The same reference numbers in different drawings identify the same components throughout the text. In the drawings: Figure 1 Structure of a prior art rotary Stirling refrigerator and structure of a regenerator component; Figures 2a-5 Structure of a leak detection tooling of an embodiment of the present application; Figure 6 Structure of a gasket and a sealing ring of a leak detection tooling of an embodiment of the present application; Figures 7-9 Installation of a leak detection tooling of an embodiment of the present application; Figures 10-13 Installation flow of a leak detection tooling of an embodiment of the present application. DETAILED DESCRIPTION

[0018] Exemplary embodiments of the present disclosure will be described below in greater detail with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0019] An embodiment of the present application provides a small rotary Stirling refrigerator regenerator spherical joint leak detection tooling, as shown in FIG. 2- Figure 5 comprises: A first sealing member 1 in a cylindrical structure, the inner wall specification of the first sealing member 1 is adapted to the access end of a second sealing member 2, a through hole is provided at the top of the first sealing member 1 for the spherical joint to extend to the other side of the top of the first sealing member, and a slot 13 is provided at the other side of the top of the first sealing member.

[0020] A second sealing member 2, one end of which is provided with a KF interface 21 and the other end is provided with a sealing groove 23, the sealing groove 23 is used to connect and install the spherical joint, and after the spherical joint is installed, the first sealing member 1 is connected to the second sealing member 2, and the spherical joint extends out of the through hole of the first sealing member 1.

[0021] The fourth seal 4 is in a sheet shape, and is provided with a clamping portion 41. The fourth seal 4 is inserted into the slot 13 to clamp the spherical joint by the clamping portion 41. In some examples, the spherical joint is further provided with a clamped portion matched with the clamping portion 41. The fourth seal 4 is clamped after being connected to the clamped portion along the slot 13.

[0022] The third seal 3 is in a column shape, and is used to be connected to one end of the spherical joint protruding from the other side of the top of the first seal.

[0023] The embodiments of the present application solve the problem of multi-position sealing of small rotary Stirling cryogenic machine regenerator spherical joint surface complex small parts by cooperation of multiple seals, simplify the number of tool parts, and simplify the process operation, thereby providing a practical and feasible solution for the requirement of Stirling cryogenic machine regenerator spherical joint structure leak detection.

[0024] In some embodiments, the first seal 1 is provided with a threaded structure on the inner wall of the cylindrical structure, that is, the inner thread 11 of the first seal 1 is matched with the outer thread 22 of the second seal 2 to realize the connection of the first seal 1 to the second seal 2. The second seal 2 is provided with a sealing groove 23 at the position connected to the spherical joint.

[0025] In some embodiments, the first seal 1 is provided with a sealing groove structure 12 on the top wall of the cylindrical structure corresponding to the through hole, which is used to cooperate with the first sealing gasket to seal the spherical joint.

[0026] In some embodiments, as shown in Figure 6 The fourth seal 4 is in a strip shape, and is provided with the clamping portion 41 at both ends, which can improve the installation and testing efficiency of the tool.

[0027] In some embodiments, the third seal 3 is provided with a threaded structure 31 inside one end, which is used to be connected to the protruding end of the spherical joint, and is provided with a tightening structure 32 at the other end, which is used to cooperate with an external tool to realize tightening. In some embodiments, the tightening structure is a hexagonal structure, and can also be other fastening structures.

[0028] In some embodiments, a second sealing gasket is further included, which is used to be arranged at the protruding end of the spherical joint to realize sealing after the third seal 3 is tightened.

[0029] The scheme of the present application is targeted at using a new regenerator spherical joint leak detection tool: As shown in Figure 7As shown, the solution of this application is for sealing of the ball cup part: the sealing position of the ball cup structure is moved from the side to the bottom surface, and the sealing is achieved by the sealing ring 1. A sealing gasket 1 made of polytetrafluoroethylene material is attached to the surface in contact with the ball cup to reduce the friction between the tooling and the ball cup structure and enhance the sealing performance of the bottom surface.

[0030] As shown in Figure 8, the solution of this application is for the sealing of the ball head part: the ball head structure seal uses the sealing element 3 and the sealing gasket 2 to cooperate with the ball head thread and the sealing element 4 for sealing.

[0031] like Figure 9 As shown, the solution of this application addresses the fixing of the ball head component: to ensure that the ball head structure maintains a uniform vertical position during the leak detection process, sealing element 4 and sealing element 1 are used for positioning.

[0032] This application also proposes an implementation example of a leak detection tool for a small rotating Stirling refrigerator regenerator with a spherical joint, such as... Figures 10-13 As shown: First, the first sealing ring is placed in the sealing groove of the second sealing element 2.

[0033] Insert the ball joint component to be inspected into the passage of the second seal 2, and insert the sealing gasket onto the ball joint component.

[0034] Screw the first seal 1 into the second seal 2 through the thread, insert the fourth seal 4 into the ball joint along the slot 13, hold the first seal 1 and the second seal 2 by hand, and tighten them so that the sealing gasket, the ball joint cup structure, the second seal 2 and the sealing ring fit tightly together. Insert the sealing gasket onto the ball joint surface to be sealed via the stepped shaft. Insert the third sealing element 3 into the ball joint shaft via the thread. Hold the first sealing element 1 and the third sealing element 3 and tighten them to make the sealing gasket and the ball shaft sealing surface fit tightly together. Thus, the first installation of the leak detection fixture for the Stirling refrigeration unit's spherical joint is completed. The upper and lower sealing surfaces of the spherical joint are sealed by the compression deformation of the sealing ring and sealing gasket. The ball head of the spherical joint is vertically fixed by the slot between the fourth sealing element 4 and the first sealing element 1, thus forming a unified leak detection path.

[0035] The removal method is the reverse of the installation operation: unscrew the third seal 3, pull out the fourth seal 4, unscrew the first seal 1, and remove the test parts.

[0036] The small rotary Stirling cryogenic machine regenerator spherical joint leak detection tool of the application meets the requirements of Stirling cryogenic machine regenerator spherical joint structure leak detection, provides a realistic and feasible solution, and performs standard unified quality verification on the existing rotary Stirling cryogenic machine, thereby further improving the reliability and quality consistency of the cryogenic machine product.

[0037] The tool of the application realizes multi-position sealing of small and complex surface moving parts, can control the process of the Stirling cryogenic machine, and ensures the consistency of process quality. The screwing and slot design is adopted to unify the fixing action of the spherical joint ball bowl and ball shaft structure to the first sealing element, thereby simplifying the process operation and process difficulty of small parts. The tool of the application protects the important parts of the Stirling cryogenic machine, and adopts a new sealing method to avoid the pollution problem that may be caused by conventional sealing.

[0038] It should be noted that in the embodiments of the application, the terms "comprise", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the sentence "comprises a" does not exclude the presence of another identical element in the process, method, article or device including the element.

[0039] The above-mentioned serial numbers of the embodiments of the application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0040] The embodiments of the application are described above in combination with the drawings, but the application is not limited to the above-mentioned specific embodiments, the above-mentioned specific embodiments are only illustrative and not restrictive, and those skilled in the art can make many forms under the inspiration of the application without departing from the scope of the application and the protection scope of the claims, which are all within the protection scope of the application.

Claims

1. A small-sized rotary Stirling cryocooler regenerator spherical joint leak detection tooling, characterized in that, The utility model relates to a sealing device for a ball joint, comprising: a first sealing element in the shape of a cylinder, the inner wall of the first sealing element being adapted to the access end of a second sealing element, the top of the first sealing element being provided with a through hole for the ball joint to protrude to the other side of the top of the first sealing element, the other side of the top of the first sealing element being provided with a slot; a second sealing element, one end of which is provided with a KF interface and the other end of which is provided with a sealing groove for connecting and mounting the ball joint, the first sealing element being connected to the second sealing element after the ball joint is mounted and the ball joint protruding through the through hole of the first sealing element; a fourth sealing element in the shape of a sheet, the fourth sealing element being provided with a bayonet, the fourth sealing element being inserted into the slot to clamp the ball joint with the bayonet; a third sealing element in the shape of a column for connecting with one end of the ball joint protruding from the other side of the top of the first sealing element.

2. The small-scale rotary Stirling cryocooler regenerator ball joint leak detection tool of claim 1, wherein, The inner wall of the cylindrical structure of the first sealing element is provided with a threaded structure.

3. The small-scale rotary Stirling cryocooler regenerator ball joint leak detection tool of claim 2, wherein, The top wall of the cylindrical structure of the first sealing element is provided with a sealing groove structure at a position corresponding to the through hole, the sealing groove structure being used for cooperating with a first sealing gasket to seal the ball joint.

4. The small-scale rotary Stirling cryocooler regenerator ball joint leak detection tool of claim 1, wherein, The fourth sealing element is in the shape of a strip, both ends of the fourth sealing element being provided with the bayonet.

5. The small-scale rotary Stirling cryocooler regenerator ball joint leak detection tool of claim 1 wherein, The third sealing element is provided with a threaded structure at one end for connecting with one end of the ball joint protruding and a tightening structure at the other end for cooperating with an external tool to realize tightening.

6. The small-scale rotary Stirling cryocooler regenerator ball joint leak detection tool of claim 5, wherein, The tightening structure is in the shape of an internal hexagon.

7. The small-scale rotary Stirling cryogenic engine regenerator ball joint leak detection tooling of claim 5, wherein, The utility model further comprises a second sealing gasket, the second sealing gasket being used for being arranged at one end of the ball joint to realize sealing after the third sealing element is tightened.

8. The small-scale rotary Stirling cryocooler regenerator ball joint leak detection tool of claim 1, wherein, The ball joint is further provided with a clamping part adapted to the bayonet.

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