Compression assembly and Stirling refrigerator

Abstract

The utility model discloses a compression assembly and a Stirling cryocooler. The assembly comprises an air cylinder body, a compression connecting rod and a compression piston which is arranged in the air cylinder body and reciprocates, the compression piston comprises a piston barrel and an end face plug, the end face plug is arranged at the first end of the piston barrel, a compression pin shaft is arranged on the piston barrel, and the compression pin shaft is connected with the compression connecting rod. One end of the compression connecting rod is connected to the compression pin shaft, the other end of the compression connecting rod extends out of the second end of the piston barrel, a stable pressure spring is arranged in the piston barrel and is in a compressed state, and the two ends of the stable pressure spring abut against the end face plug and the compression pin shaft respectively. The compression assembly is simple in structure, the compression piston is of a split structure, the assembly difficulty of the compression assembly is effectively reduced, the assembly efficiency is improved, the assembly precision and consistency of the compression assembly are improved, and then the reliability of the refrigerating machine is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of Stirling refrigerators, in particular to a compression component and a Stirling refrigerator. Background Art

[0002] Stirling refrigerators are ideal cooling sources for infrared detectors, superconducting filters and other devices due to their compact structure, small size, light weight and high efficiency. They are widely used in the cryogenic industry, scientific research and military fields.

[0003] The compression assembly is an important component in the Stirling refrigerator. At present, in the compression assembly, the stabilizing spring is sleeved on the compression connecting rod and is located on the side of the compression pin close to the large end of the compression connecting rod. The stabilizing spring is assembled first, and then the compression pin is installed. The compression pin can only be positioned and fixed by knocking. During the knocking process, the compression pin will pass through the compression piston pin hole, the end face of the stabilizing spring and the inner hole of the bearing. The stabilizing spring will exert lateral force on the compression pin due to elastic deformation due to compression, so that the compression pin will scratch and bump against the compression piston pin hole, the end face of the stabilizing spring and the inner wall of the bearing during the knocking installation process, resulting in scratches, pits, peeling and other problems on the contact surfaces of the above parts, which may cause increased mechanical noise of the refrigerator, increased current fluctuations, jamming, and jamming, affecting the use effect of the refrigerator. Utility Model Content

[0004] In order to solve the above problems, on the one hand, the utility model provides a compression assembly, including a cylinder body, a compression connecting rod and a compression piston arranged in the cylinder body for reciprocating movement, the compression piston including a piston cylinder and an end face plug, the end face plug is arranged at the first end of the piston cylinder, a compression pin is provided on the piston cylinder, one end of the compression connecting rod is connected to the compression pin, and the other end extends out of the second end of the piston cylinder, a stabilizing compression spring is provided in the piston cylinder, the stabilizing compression spring is in a compressed state and its two ends are respectively in contact with the end face plug and the compression pin.

[0005] Furthermore, the end face plug is detachably connected to the piston cylinder.

[0006] Furthermore, the end face plug is threadedly connected to the piston cylinder.

[0007] Furthermore, the end face plug is provided with a plurality of operating holes, each of the operating holes is arranged along the circumference of the end face plug, and each of the operating holes is arranged corresponding to the end face of the piston cylinder.

[0008] Furthermore, one end of the compression link close to the stabilizing compression spring extends into the stabilizing compression spring.

[0009] Furthermore, a limiting structure that cooperates with the compression pin is provided on the contact surface of the stabilizing compression spring and the compression pin.

[0010] Furthermore, a bearing is provided at one end of the compression connecting rod connected to the compression pin, and the bearing is sleeved on the compression pin.

[0011] Furthermore, two pin holes are provided on the piston cylinder, and both ends of the compression pin shaft are respectively mounted on the two pin holes, and the axial direction of the compression pin shaft is parallel to the radial direction of the piston cylinder.

[0012] Furthermore, the compression pin is fixed to the pin hole by gluing.

[0013] On the other hand, the present invention further provides a Stirling refrigerator, comprising a drive motor and the compression assembly as described above, wherein the drive motor is connected to the compression piston.

[0014] The assembly process of the compression assembly of the present invention is as follows: the bearing component is assembled on the small end of the compression connecting rod, the small end of the compression connecting rod is placed in the piston cylinder, and then the compression pin is installed on the piston cylinder. The compression pin passes through the bearing component to connect the compression connecting rod and the compression pin, and then the stabilizing compression spring is inserted from the first end of the piston cylinder, and finally the end face plug is installed at the first end of the piston cylinder. After the end face plug is installed, the stabilizing compression spring is pre-tightened between the end face plug and the compression pin to ensure that the compression pin and the bearing component are stably matched and there is no intermittent collision when the refrigerator moves.

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

[0016] The compression assembly provided by the utility model has a simple structure. The compression piston adopts a split structure and is assembled from a piston cylinder and an end face plug. The compression pin and the compression connecting rod can be assembled first, and then the stabilizing compression spring is pre-tightened between the end face plug and the compression pin. The compression pin does not need to be knocked during assembly, thereby avoiding scratches, pits, peeling and other problems on the contact surfaces of various parts of the compression pin caused by knocking, effectively reducing the assembly difficulty of the compression assembly, improving assembly efficiency, and improving the assembly accuracy and consistency of the compression assembly, thereby improving the reliability of the refrigerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic structural diagram of the compression assembly provided by the present invention;

[0019] Figure 2 This is a schematic structural diagram of the compression piston in the compression assembly provided by the present utility model;

[0020] Figure 3 This is a schematic structural diagram of the end face plug in the compression assembly provided by the utility model.

[0021] 1-cylinder body; 2-piston cylinder; 21-second thread; 22-pin hole; 3-end face plug; 31-end panel; 32-plug side wall; 33-first thread; 34-operating hole; 4-compression connecting rod; 5-compression pin; 6-stabilizing compression spring; 7-bearing. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings of the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention. In the drawings, the size and relative sizes of some parts may be exaggerated for clarity.

[0023] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connection" and "connected" should be interpreted broadly. 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.

[0024] In the description of the present invention, the terms "up", "down", "left", "right", "front", "back", "center", "horizontal", "vertical", "top", "bottom", "inside", "outside" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0025] Furthermore, in the description of this utility model, the terms "first" and "second" are used solely to distinguish between the features in the description and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Furthermore, features designated as "first" or "second" may explicitly or implicitly include one or more of the features.

[0026] Example 1

[0027] As the instruction manual Figure 1 As shown, the present invention provides a compression assembly, comprising a cylinder body 1, a compression connecting rod 4, and a compression piston reciprocatingly disposed in the cylinder body 1, the compression piston comprising a piston cylinder 2 and an end plug 3, the end plug 3 being disposed at the first end of the piston cylinder 2, a compression pin 5 being disposed on the piston cylinder 2, one end of the compression connecting rod 4 being connected to the compression pin 5, and the other end extending out of the second end of the piston cylinder 2, a stabilizing compression spring 6 being disposed within the piston cylinder 3, the stabilizing compression spring 6 being in a compressed state and having its two ends respectively abutting against the end plug 3 and the compression pin 5. In this embodiment, the compression pin 5 passes through the chamber of the piston cylinder 2 and is used to mount the compression connecting rod 4 on the piston cylinder 2, and the axial direction of the stabilizing compression spring is parallel to the axial direction of the compression connecting rod.

[0028] In this embodiment, the cylinder body 1 is used to accommodate the compression piston, and the compression connecting rod 4 is used to connect the compression pin 5 to the external driving power structure, so that the compression pin 5 drives the compression piston to reciprocate within the cylinder body 1. In this embodiment, the compression piston adopts a split structure, and the compression piston is assembled by a piston cylinder 2 and an end plug 3. The cylinder body 1 is sleeved on the piston cylinder 2, and the two are clearance-matched. During the assembly process, the compression connecting rod 4 and the compression pin 5 can be assembled first, and the assembly position can be aligned. Then, the stabilizing spring 6 is installed. Finally, the end plug 3 is assembled on the piston cylinder 2. The stabilizing spring 6 is pre-tightened between the compression pin 5 and the end plug 3, and the two ends are respectively abutted against the compression pin 5 and the end plug 3, ensuring that the compression pin 5 and the compression connecting rod 4 are stably matched, and intermittent collisions will not occur during the operation of the refrigerator. The split structure of the compression piston changes the assembly method of the compression component, effectively reduces the difficulty of the compression component assembly, improves the assembly accuracy and consistency of the compression component, and thus improves the reliability of the refrigerator.

[0029] In an optimized embodiment, the end plug 3 is detachably connected to the piston cylinder 2. The compression piston adopts a split structure, and the end plug 3 and the piston cylinder 2 are detachably connected. While adjusting the assembly method and reducing the assembly difficulty, the stabilizing compression spring 6 can also be replaced or recovered to ensure the normal operation of the compression assembly.

[0030] In practical applications, the end plug 3 and the piston cylinder 2 can be connected by means of buckles, bolts, screws, etc. Of course, in some embodiments, the end plug 3 can be welded to the piston cylinder 2.

[0031] Optional implementation methods, such as the attached instructions Figure 2 and 3As shown, the end face plug 3 is threadedly connected to the piston cylinder 2.

[0032] In an optimized embodiment, the end plug 3 includes an end panel 31 and a plug sidewall 32. The plug sidewall 32 is mounted on the end panel 31 and forms an integral structure with the end panel 31. A cavity is formed within the plug sidewall 32 to accommodate the stabilizing compression spring 6. The plug sidewall 32 of the end plug 3 is provided with a first thread 33, and the first end of the piston cylinder 2 is provided with a second thread 21 that mates with the first thread 33. In this embodiment, the first thread 33 is an external thread, and the second thread 21 is an internal thread. The end plug 3 is inserted into the piston cylinder 2 and is secured thereto by screwing.

[0033] In an optimized embodiment, the diameter of the end panel 31 of the end face plug 3 is larger than the diameter of the plug sidewall 32. The end panel 31 has an extension extending beyond the plug sidewall 32. A plurality of operating holes 34 are provided on the end panel 31. Each of these operating holes 34 is arranged circumferentially along the end panel 31. The operating holes 34 are located on the extension and correspond to the end face of the piston cylinder 2 to ensure sealing within the compression piston. The provision of operating holes 34 on the end panel 31 facilitates operation with an installation tool, allowing installation and removal of the end face plug 3. The diameter of the end panel 31 is equal to the outer diameter of the piston cylinder 2, facilitating assembly of the compression piston into the cylinder body 1.

[0034] An optimized implementation method is that the end of the compression connecting rod 4 extending into the piston cylinder 2 is the small end, and the end extending out of the piston cylinder 2 is the large end. A through hole is provided on the small end of the compression connecting rod 4 for installing a bearing member 7. The bearing member 7 is fixed to the compression connecting rod 4 by interference fitting, and the end equipped with the bearing member 7 is extended into the piston cylinder 2. Two pin holes 22 are provided on the piston cylinder 2, and the two pin holes 22 are arranged along the radial direction of the piston cylinder 2. The bearing member 7 is aligned with the pin holes 22. One end of the compression pin shaft 5 first passes through one of the pin holes 22 and the bearing member 7 until it reaches the pin hole 22 on the other side of the piston cylinder 2. The compression connecting rod 4 is installed in the piston cylinder 2. The compression pin shaft 5 is installed along the radial direction of the piston cylinder 2, and the bearing member 7 is sleeved on the compression pin shaft 5.

[0035] In an optimized implementation manner, both ends of the compression pin shaft 5 are glued and fixed to the pin hole 22 of the piston cylinder 2 .

[0036] In an optimized embodiment, the bearing member 7 is a needle roller bearing or a deep groove ball bearing. In this embodiment, the bearing member is a needle roller bearing.

[0037] In one embodiment, a through hole is provided on the large end of the compression connecting rod 4 for installing a deep groove ball bearing. The deep groove ball bearing is used to enable the end of the compression connecting rod 4 located outside the piston cylinder 2 to be connected to an external shaft.

[0038] In an optimized embodiment, the end of the compression connecting rod 4, closest to the stabilizing spring 6, extends into the stabilizing spring. The end plug 3 is tightened onto the piston cylinder 2. The stabilizing spring 6 has a certain preload, which can exert a force on the compression pin 5, ensuring a stable fit between the compression pin 5 and the needle bearing, and preventing intermittent collisions during the operation of the refrigerator.

[0039] In one embodiment, the degree of compression of the stabilizing compression spring 6 can be adjusted by adjusting the degree of screwing of the end face plug 3 on the piston sleeve 2, so as to adjust the force applied by the stabilizing compression spring 6 on the compression pin 5 to meet different usage requirements.

[0040] In one embodiment, a limiting structure is provided on the contact surface between the stabilizing compression spring 6 and the compression pin 5 to limit the position of the compression pin. The limiting structure includes an arcuate groove on the contact surface of the stabilizing compression spring 6. The curvature of the arcuate groove matches that of the compression pin 5. The compression pin 5 can be partially embedded in the arcuate groove to achieve position limiting between the stabilizing compression spring 6 and the compression pin 5.

[0041] Example 2

[0042] The present invention also provides a Stirling refrigerator, comprising a drive motor and a compression assembly as described in Example 1, wherein the drive motor is connected to the compression piston via a compression connecting rod 4, and drives the compression piston to reciprocate in the cylinder body 1.

[0043] At the same time, the contents not described in detail in this specification belong to the existing technology well known to those skilled in the art.

[0044] Those skilled in the art will appreciate that the present invention may be implemented in many other specific forms without departing from the spirit and scope of the present invention. Although embodiments of the present invention have been described, it should be understood that the present invention should not be limited to these embodiments, and those skilled in the art may make changes and modifications within the spirit and scope of the present invention as defined by the appended claims.

Claims

1. A compression assembly comprising a cylinder body, a compression connecting rod, and a compression piston disposed in the cylinder body and reciprocating, characterized in that: The compression piston includes a piston cylinder and an end face plug, the end face plug is arranged at the first end of the piston cylinder, a compression pin is provided on the piston cylinder, one end of the compression connecting rod is connected to the compression pin, and the other end extends out of the second end of the piston cylinder, a stabilizing compression spring is provided in the piston cylinder, the stabilizing compression spring is in a compressed state and its two ends are respectively in contact with the end face plug and the compression pin.

2. The compression assembly according to claim 1, wherein The end face plug is detachably connected to the piston cylinder.

3. The compression assembly according to claim 2, wherein: The end face plug is threadedly connected to the piston cylinder.

4. The compression assembly according to claim 1, wherein The end face plug is provided with a plurality of operating holes, each of which is arranged along the circumference of the end face plug, and each of which is arranged corresponding to the end face of the piston cylinder.

5. The compression assembly according to claim 1, wherein One end of the compression link close to the stabilizing compression spring extends into the stabilizing compression spring.

6. The compression assembly according to claim 1, wherein A limiting structure that cooperates with the compression pin is provided on the contact surface of the stabilizing compression spring and the compression pin.

7. The compression assembly according to claim 1, wherein A bearing is provided on one end of the compression connecting rod connected to the compression pin shaft, and the bearing is sleeved on the compression pin shaft.

8. The compression assembly according to claim 1, wherein The piston cylinder is provided with two pin holes, and the two ends of the compression pin shaft are respectively mounted on the two pin holes, and the axial direction of the compression pin shaft is parallel to the radial direction of the piston cylinder.

9. The compression assembly according to claim 8, wherein The compression pin is glued and fixed to the pin hole.

10. A Stirling refrigerator, characterized in that: It comprises a drive motor and the compression assembly according to any one of claims 1 to 9, wherein the drive motor is connected to the compression piston.

Images