A compression assembly and stirling cryocooler therefor

Abstract

The utility model relates to a stirling refrigerating machine technical field, concretely is a kind of compression assembly and its stirling refrigerating machine, it is related to big base, comprising: compression cylinder, the inside of compression cylinder is provided with compression piston;Compression pin shaft, it is arranged in the inside of compression piston along radial, and the connecting place of compression pin shaft and compression piston is provided with fastener;Compression connecting rod, one end is inserted in the inside of compression piston, and the compression connecting rod is connected with compression pin shaft.Connecting by fastening screw and compression pin shaft for compression piston, the reliability of compression piston and pin shaft connection can be improved, simultaneously, it is convenient to refrigerating machine inspection and maintenance compression piston, improve the maintainability of refrigerating machine, avoid the problem of lateral force and piston wear caused by interference assembly or adhesive fixed of traditional compression piston and compression pin shaft.

Description

Technical Field

[0001] This utility model relates to the field of Stirling refrigerator technology, specifically to a compression component and its Stirling refrigerator. Background Technology

[0002] With the continuous application of infrared technology in fields such as reconnaissance and alarm, guidance and control, and long-range air defense at medium and high altitudes, infrared focal plane detectors have been continuously developed. In recent years, with the changes in the application environment, the system has put forward increasingly strict requirements on the vibration of infrared detectors. When the vibration is large, it is easy to cause abnormalities such as image jitter. Rotary Stirling refrigerators are one of the most widely used refrigerators for infrared focal plane detectors.

[0003] Rotary integral Stirling refrigeration units typically consist of two parts: a compressor and an expander. Driven by the drive components, the rotor assembly rotates, thereby driving the compressor and expander to move. Due to the fixed phase difference between the accumulator in the expander and the compression piston in the compressor, the movement of the accumulator always leads the compression piston by a phase angle, thus producing a highly efficient refrigeration effect. Meanwhile, the reciprocating motion of the compression piston is driven by the rotating shaft cam structure to swing the compression connecting rod, which is connected to the compression piston through the compression pin, thus driving the compression piston to move. The compression piston and the compression pin are usually fixed by interference fit or adhesive.

[0004] Due to its mechanism, the reciprocating motion of the compression piston inevitably leads to lateral forces and piston wear. Once the piston is worn, replacement is difficult and requires complete disassembly of the machine for inspection and replacement. Furthermore, the adhesive bonding and interference fit between the compression piston and the compression pin can result in insufficient strength, leading to pin loosening. Utility Model Content

[0005] The purpose of this invention is to provide a compression component and its Stirling refrigerator to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A compression component, comprising:

[0008] A compression cylinder, wherein a compression piston is provided inside the compression cylinder;

[0009] A compression pin is radially disposed inside the compression piston, and a fastener is provided at the connection between the compression pin and the compression piston;

[0010] A compression connecting rod is inserted at one end into the interior of the compression piston, and the compression connecting rod is connected to the compression pin.

[0011] Preferably, the compression cylinder is disposed inside the large base, and an O-ring is provided between the compression cylinder and the large base.

[0012] Preferably, the end of the compression connecting rod connected to the compression pin is provided with a needle roller bearing, and the compression pin is inserted into the needle roller bearing.

[0013] Preferably, the end of the compression connecting rod away from the compression pin is connected to the Stirling refrigerator shaft inside the large base, and the end of the compression connecting rod connected to the Stirling refrigerator shaft is provided with a deep groove ball bearing.

[0014] Preferably, the end face of the compression piston is recessed to form a stepped portion, the compression pin abuts against the stepped portion, and the compression pin and the stepped portion are fixedly connected by fasteners.

[0015] Preferably, the compression pin has a threaded hole, and the fastener includes a fastening screw, one end of which passes through the stepped portion of the compression piston and is screwed into the threaded hole.

[0016] Preferably, a matching metal sealing ring is fitted between the nut of the fastening screw and the stepped portion.

[0017] Preferably, the end of the large base is provided with a matching compression end cap at the position corresponding to the opening end of the compression cylinder, and the large base and the compression end cap are connected by fastening screws.

[0018] Preferably, a Stirling refrigerator includes the aforementioned compression assembly.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] The compression piston of this invention is connected by fasteners and a compression pin, which can improve the reliability of the connection between the compression piston and the pin. At the same time, it facilitates the inspection and maintenance of the compression piston in the refrigeration machine, improves the maintainability of the refrigeration machine, and avoids the problems of lateral force and piston wear caused by the traditional compression piston and compression pin using interference fit or adhesive fixation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the assembly structure of the compression component of this utility model;

[0022] Figure 2 This is a schematic cross-sectional view of the compression piston structure of this utility model;

[0023] Figure 3 This is a schematic diagram of the compression piston structure of this utility model.

[0024] In the diagram: 1. Large base; 2. O-ring; 3. Compression cylinder; 4. Compression piston; 5. Metal sealing ring; 6. Fastening screw; 7. Compression pin; 8. Needle roller bearing; 9. Compression connecting rod; 10. Deep groove ball bearing; 11. Compression end cap. Detailed Implementation

[0025] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0026] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0027] Furthermore, it should be understood in the description of this utility model that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two main bodies at the connection point are not connected by an intermediate structure, but are simply connected to form a whole through a connecting structure. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0029] In this utility model, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. 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.

[0030] Example 1:

[0031] Please see Figures 1 to 3 This utility model provides a technical solution: a compression component, comprising:

[0032] A compression cylinder 3, wherein a compression piston 4 is provided inside the compression cylinder 3; both the compression cylinder 3 and the compression piston 4 are cylindrical, and the compression piston 4 is slidably disposed inside the compression cylinder 3 and the two are in clearance fit.

[0033] A compression pin 7 is radially disposed inside the compression piston 4, and a fastener is provided at the connection between the compression pin 7 and the compression piston 4, and the compression pin 7 and the compression piston 4 are connected by the fastener.

[0034] The compression connecting rod 9 has one end inserted into the inside of the compression piston 4 and the other end extending out of the outside of the compression piston 4. The compression connecting rod 9 is connected to the compression pin 7. The compression connecting rod 9 drives the compression pin 7 and the compression piston 4 to reciprocate within the compression cylinder 3.

[0035] The compression piston 4 and compression pin 7 are connected via fasteners, thereby improving their reliability. This also facilitates inspection and maintenance of the compression piston in the refrigeration unit, enhancing its maintainability. Furthermore, it avoids the lateral forces and piston wear problems associated with traditional interference fits or adhesive fastening methods for the compression piston and pin.

[0036] Example 2:

[0037] like Figure 2 As shown, the compression assembly and its Stirling refrigerator disclosed in Embodiment 2 of this utility model have a structure that is basically the same as that in Embodiment 1, except that:

[0038] It also includes a large base 1, and the compression cylinder 3 is disposed inside the large base 1. The outer wall of the compression cylinder 3 is adapted to the inner wall of the large base 1, and an O-ring 2 is provided between the compression cylinder 3 and the large base 1. The O-ring 2 is used to achieve a seal between the compression cylinder 3 and the large base 1 to prevent the internal refrigerant from leaking out.

[0039] The end of the compression connecting rod 9 connected to the compression pin 7 is provided with a needle roller bearing 8. The connecting rod ring at the end of the compression connecting rod 9 is sleeved on the outside of the needle roller bearing 8, and the compression pin 7 is inserted into the inside of the needle roller bearing 8. Through the cooperation of the needle roller bearing 8, the rotational connection between the compression pin 7 and the compression connecting rod 9 is realized.

[0040] The end of the compression connecting rod 9 away from the compression pin 7 is connected to the Stirling refrigerator shaft inside the large base 1, and a deep groove ball bearing 10 is provided at the end of the compression connecting rod 9 connected to the Stirling refrigerator shaft; the rotational connection between the compression connecting rod 9 and the large base 1 is achieved through the deep groove ball bearing 10. Specifically, the end of the compression connecting rod 9 connected to the Stirling refrigerator shaft has a connecting rod large ring, which is sleeved on the outside of the deep groove ball bearing 10. The deep groove ball bearing 10 is sleeved on the eccentric part of the Stirling refrigerator shaft, so that when the Stirling refrigerator shaft rotates, the compression piston 4 can be driven to reciprocate within the compression cylinder 3 through the compression connecting rod 9.

[0041] The end of the compression piston 4 away from the compression connecting rod 9 is closed, and the closed end face is sunken to form a stepped portion. Specifically, the outer periphery of the closed end face may be sunken, or only the two ends symmetrically along the center of the end face may be sunken. The compression pin 7 abuts against the side of the stepped portion located inside the compression piston 4, and the compression pin 7 and the stepped portion are fixedly connected by fasteners.

[0042] Specifically, the compression pin 7 has a threaded hole, and the fastener includes a fastening screw 6. One end of the fastening screw 6 passes through the stepped portion of the compression piston 4 and is screwed into the threaded hole. The nut of the fastening screw 6 is located outside the stepped portion. The compression pin 7 and the compression piston 4 are connected by the fastening screw 6. Preferably, there are two fastening screws 6.

[0043] A matching metal sealing ring 5 is fitted between the nut of the fastening screw 6 and the stepped portion. The metal sealing ring 5 is located between the nut of the fastening screw 6 and the outer side of the stepped portion to seal the gap between them.

[0044] The end of the large base 1 is provided with a matching compression end cap 11 at the position corresponding to the opening end of the compression cylinder 3; the compression end cap 11 achieves sealing and protection of the inside of the compression cylinder 3; the large base 1 and the compression end cap 11 are connected by fastening screws.

[0045] The compression assembly is assembled as follows: the compression pin 7 is installed into the needle roller bearing 8 located at one end of the compression connecting rod 9, the compression pin 7 is abutted against the inner side of the stepped part of the compression piston 4, the metal sealing ring 5 is placed in the countersunk hole of the compression piston 4, and then the compression piston 4 is fastened to the compression pin 7 by the screw 6.

[0046] Insert the O-ring 2 into the compression cylinder 3 and place it into the mounting hole on the large base 1. Place the compression piston 4 into the compression cylinder 3 and then install the compression end cap 11.

[0047] If the compression assembly inside the Stirling refrigeration unit becomes stuck or experiences current fluctuations during production or use, and the compression piston 4 needs to be replaced, remove the compression end cover 11, then remove the compression cylinder and O-ring 2, loosen the fastening screw 6, and then take out the compression piston 4. Check the condition of the compression piston 4. If the compression piston 4 needs to be replaced, replace it with a new compression piston 4 and install it in sequence according to the assembly method.

[0048] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0049] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A compression component, characterized in that, include: A compression cylinder (3) is provided with a compression piston (4) inside the compression cylinder (3); A compression pin (7) is radially disposed inside the compression piston (4), and a fastener is provided at the connection between the compression pin (7) and the compression piston (4); A compression connecting rod (9) is inserted into the inside of the compression piston (4) at one end, and the compression connecting rod (9) is connected to the compression pin (7).

2. The compression assembly according to claim 1, characterized in that, The compression cylinder (3) is disposed inside the large base (1), and an O-ring (2) is disposed between the compression cylinder (3) and the large base (1).

3. The compression assembly according to claim 1, characterized in that, The end of the compression connecting rod (9) connected to the compression pin (7) is provided with a needle roller bearing (8), and the compression pin (7) is inserted into the inside of the needle roller bearing (8).

4. The compression assembly according to claim 2, characterized in that, The end of the compression connecting rod (9) away from the compression pin (7) is connected to the Stirling refrigerator shaft inside the large base (1), and a deep groove ball bearing (10) is provided at the end of the compression connecting rod (9) connected to the Stirling refrigerator shaft.

5. The compression assembly according to claim 1, characterized in that, The end face of the compression piston (4) is recessed to form a stepped portion, the compression pin (7) abuts against the stepped portion, and the compression pin (7) and the stepped portion are fixedly connected by fasteners.

6. The compression assembly according to claim 5, characterized in that, The compression pin (7) has a threaded hole, and the fastener includes a fastening screw (6). One end of the fastening screw (6) passes through the stepped part of the compression piston (4) and is screwed into the threaded hole.

7. The compression assembly according to claim 6, characterized in that, A matching metal sealing ring (5) is fitted between the nut of the fastening screw (6) and the stepped portion.

8. The compression assembly according to claim 2, characterized in that, The end of the large base (1) is provided with a matching compression end cap (11) at the opening position of the compression cylinder (3), and the large base (1) and the compression end cap (11) are connected by fastening screws.

9. A Stirling refrigerator, characterized in that, Includes the compression component as described in any one of claims 1-8.

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