Compression assembly and Stirling refrigerator

Abstract

The utility model relates to a compression assembly and a Stirling cryocooler using the same, and the compression assembly comprises a compression piston which reciprocates in a through groove of a compression air cylinder; the compression pin shaft is transversely arranged in an inner cavity of the compression piston; the lower end of the compression connecting rod is connected to the compression pin shaft, and the upper end extends out of the compression air cylinder; the universal bearing and the polishing cloth are located in the compression connecting rod, an inner ring of the universal bearing is fixedly connected to the compression pin shaft in a sleeving mode, an outer ring of the universal bearing is fixed to the compression connecting rod, and the polishing cloth is arranged between the outer ring of the universal bearing and the compression connecting rod. According to the self-pretightening and self-cleaning compression assembly and the rotary Stirling cryocooler using the same, the pollutant cleaning effect is achieved through the design of the polishing cloth and the spring shaft sleeve, meanwhile, the structure is simple, the space is small, the size limitation of a connecting rod and abrasion of a friction pair are reduced, the long-term service life of the cryocooler is prolonged, and the service life of the cryocooler is prolonged. And the application range and field of the detector are expanded.

Description

Technical Field

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

[0002] The rotary Stirling refrigerator has the characteristics of high integration and small size, and is widely used in the fields of infrared detection, space detection, biomedicine, etc. However, ultra-high precision assembly and small structural size greatly limit the stability design of the refrigerator compression component, affecting the long-term reliability of the refrigerator. The Stirling refrigerator drives the motor shaft to move through the motor, and the compression and push connecting rods rotate with the eccentric wheel on the motor shaft to achieve reciprocating linear motion of the compression piston and the push piston.

[0003] The traditional refrigerator compression structure uses a spring mechanism to support the compression piston, or uses universal bearings and sleeves, and uses spring preload to achieve universal bearing deflection, but these methods have defects. The spring mechanism causes the piston and cylinder to be unable to be completely aligned, which can easily cause mechanical wear and limit the life and reliability of the refrigerator. Although the method of using universal bearings and wave spring preload can achieve free deflection of the piston, it is difficult to install, occupies a large space, and easily causes wear on the bearing sleeve and bearing. A strong mechanical connection is used to ensure the positional relationship between the piston and the connecting rod, but this cannot guarantee the coaxiality of the piston and the cylinder, resulting in eccentric wear, abnormal wear or jamming. Utility Model Content

[0004] In view of the above defects or improvements required in the prior art solutions, the main purpose of the utility model is to propose a compression assembly and a Stirling refrigerator using the same, which reduces the wear of the refrigerator bearing sleeve, achieves smooth deflection of the compression piston, reduces the wear of the friction pair, and improves the reliability of the refrigerator.

[0005] To achieve the above-mentioned purpose, in the first aspect, the utility model discloses a compression assembly, including a compression piston, which reciprocates in a through groove of a compression cylinder; a compression pin, which is transversely arranged in the inner cavity of the compression piston; a compression connecting rod, whose lower end is connected to the compression pin and whose upper end extends out of the compression cylinder; and also includes a universal bearing and a polishing cloth located in the compression connecting rod, the inner ring of the universal bearing is sleeved and fixed on the compression pin, the outer ring is fixed to the compression connecting rod, and the polishing cloth is arranged between the outer ring of the universal bearing and the compression connecting rod.

[0006] Preferably, the compression connecting rod includes a bearing hole, the inner wall of the bearing hole includes a bevel and a straight edge, the universal bearing includes an upper spherical surface, a cylindrical surface and a lower spherical surface, the upper spherical surface of the universal bearing is in tangential contact with the bevel of the bearing hole, the polishing cloth is arranged between the straight edge of the bearing hole and the cylindrical surface of the universal bearing, and the polishing cloth is clearance-matched with the cylindrical surface of the universal bearing.

[0007] Preferably, the polishing cloth and the upper spherical surface of the universal bearing are in a slight interference fit.

[0008] Preferably, the polishing cloth is wool felt.

[0009] Preferably, the wool felt is annular and has a beveled groove, and the opening of the beveled groove faces the universal bearing.

[0010] Preferably, a spring sleeve is further included, the spring sleeve includes an annular fixing portion and an elastic portion extending obliquely downward from the inner ring of the fixing portion, and the lower spherical surface of the universal bearing is tangent to the elastic portion of the spring sleeve.

[0011] Preferably, a positioning groove is provided on the straight side of the bearing hole, and the outer ring of the fixing portion of the spring sleeve is clamped in the positioning groove and the two are interference fit.

[0012] Preferably, the elastic portion is provided with spring grooves, and the spring grooves are evenly distributed around the circumference.

[0013] Preferably, both ends of the compression pin are fixed to the compression piston by gluing.

[0014] In a second aspect, the utility model further discloses a Stirling refrigerator, comprising a motor and the above-mentioned compression assembly, wherein the motor is connected to the compression piston to provide power for the compression piston to reciprocate in the through groove of the compression cylinder.

[0015] The beneficial effects of the utility model are as follows: the utility model provides a self-preloaded and self-cleaning compression assembly and a rotary Stirling refrigerator using the same. The universal bearing realizes effective axial preload through the spring sleeve. The spring sleeve realizes the integration of the functions of the bearing and the retaining spring. At the same time, the built-in annular wool felt realizes continuous cleaning and polishing of the bearing and the sleeve during cyclic operation. This mechanism not only ensures the smooth operation of the bearing, but also effectively reduces the accumulation of wear particles; the compression connecting rod realizes the function of the bearing sleeve, significantly enhancing the strength and stability under the tiny structure, which not only improves the smoothness of the deflection of the compression piston, but also reduces the wear of the friction pair. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 is a cross-sectional schematic diagram of a compression assembly of an embodiment of the utility model;

[0018] Figure 2 is an exploded view of a compression assembly of an embodiment of the utility model;

[0019] Figure 3 It is a schematic diagram of the structure of a spring universal shaft sleeve according to an embodiment of the utility model.

[0020] Explanation of the reference numerals: 1-compression connecting rod, 2-compression piston, 3-polishing cloth, 4-compression pin, 5-universal bearing, 6-elastic bushing, 7-bevel groove, 8-positioning groove, 9-fixing part, 10-elastic part, 11-spring groove. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the utility model in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the utility model belong to the utility model.

[0022] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0023] See also Figure 1-3 The present embodiment provides an improved compression assembly for improving the performance and reliability of a refrigerator, including a compression piston 2, which is located in a compression cylinder and can reciprocate in a through groove; a compression pin 4 is transversely arranged in the inner cavity of the compression piston 2, and the compression pin 4 provides necessary support and movement guidance for the compression piston; a compression connecting rod 1, whose lower end is connected to the compression pin and whose upper end extends out of the compression cylinder, is a key component connecting the compression piston 2 with the rest of the compressor; and also includes a universal bearing 5 and a polishing cloth 3 located in the compression connecting rod 1, wherein the inner ring of the universal bearing 5 is sleeved and fixed on the compression pin 4, and the outer ring is fixed to the compression connecting rod 1, and the polishing cloth 3 is arranged between the outer ring of the universal bearing 5 and the compression connecting rod 1.

[0024] Furthermore, the compression connecting rod 1 includes a bearing hole, the inner wall of the bearing hole includes a bevel and a straight edge, the universal bearing 5 includes an upper spherical surface, a cylindrical surface and a lower spherical surface, the upper spherical surface of the universal bearing 5 is in tangential contact with the bevel of the bearing hole, allowing the compression connecting rod 1 to adapt to different angle changes during operation, thereby improving the flexibility and efficiency of movement; the polishing cloth 3 is arranged between the straight edge of the bearing hole and the cylindrical surface of the universal bearing 5, and the polishing cloth 3 is clearance-matched with the cylindrical surface of the universal bearing 5. The function of the polishing cloth 3 is to achieve continuous cleaning and polishing of the bearing during the movement of the bearing, thereby reducing wear and extending the service life of the bearing.

[0025] Furthermore, the polishing cloth 3 and the upper spherical surface of the universal bearing 5 can be designed to have a slight interference fit, so that there is a slight compression effect between the universal bearing 5 and the polishing cloth 3 during installation. This design not only ensures that the polishing cloth 3 maintains proper contact with the bearing during movement, but also helps to achieve more effective cleaning and maintenance. The polishing cloth 3 can be made of wool felt, sponge cloth, flannel cloth and fiber cloth, etc., preferably wool felt, and can be designed to be annular. This annular structure enables the wool felt to completely wrap the corresponding part of the universal bearing 5, ensuring uniform contact with the surface of the bearing during the entire operating cycle. In addition, the wool felt is also specially provided with a bevel groove 7, which is used to store wear particles generated during the movement of the universal bearing 5 to prevent them from being deposited in the friction pair. The advantage of this design is that it can not only effectively capture and store wear particles, but also prevent these particles from re-entering the bearing or other components, thereby reducing wear and extending the service life of the entire compression assembly.

[0026] In some embodiments, a spring sleeve 6 is further included, which includes an annular fixing portion 9 and an elastic portion 10 extending obliquely downward from the inner ring of the fixing portion. The lower spherical surface of the universal bearing 5 is tangent to the elastic portion 10 of the spring sleeve 6. The design of the spring sleeve 6 not only provides the necessary axial preload for the universal bearing 5, but also ensures the stable positioning of the bearing through the contact between its elastic portion 10 and the lower spherical surface.

[0027] A positioning groove 8 is provided on the straight side of the bearing hole, and the outer ring of the fixing portion 9 of the spring sleeve 6 is clamped in the positioning groove 8 and the two are interference fit. The outer ring edge of the fixing portion 9 is a beveled edge, which forms an interference fit with the positioning groove 8 of the compression connecting rod 1. During the installation process, the spring sleeve 6 is squeezed by its inherent elasticity so as to be installed in the positioning groove 10 in the bearing hole of the compression connecting rod 1. Once the installation is completed, the spring sleeve 6 returns to its original shape by its elasticity to achieve a tight and fixed position in the positioning groove 8. This design ensures the stability of the spring sleeve 6 and the correct position installation of the spring sleeve 6.

[0028] See also Figure 3In order to improve the functionality of the spring sleeve 6, spring grooves 11 are provided on the elastic part. These grooves increase the flexibility of the sleeve, help reduce the wear caused by stress concentration, and realize the self-adaptation of the axial position tolerance of the compression assembly through the slight deformation of the spring sleeve 6. Furthermore, these spring grooves 11 are evenly distributed in the spring sleeve 6 in a circumferential manner. This evenly distributed design helps to evenly disperse the pressure and ensure that the sleeve is evenly stressed during operation, thereby enhancing the stability and durability of the entire compression assembly. The wear particle contaminants on the lower spherical surface of the universal bearing 5 can also be removed through the spring grooves 11 of the spring sleeve 6.

[0029] In some embodiments, the two ends of the compression pin 4 are fixed to the compression piston 2 by adhesive, and a deep groove ball bearing is installed inside the top end of the compression connecting rod 1. The deep groove ball bearing can effectively withstand the radial and axial loads of the compression connecting rod 1 during operation due to its strong load-bearing capacity and good adaptability.

[0030] See also Figure 1-2 The installation method of the compression assembly in this embodiment is as follows: First, the universal bearing 5 is installed in the bearing hole of the compression connecting rod 1, ensuring that the upper spherical surface of the universal bearing 5 is in tangential contact with the bevel of the bearing hole of the compression connecting rod 1. This tangential contact method is crucial to ensure the stability and accuracy of the universal bearing during movement. Next, the polishing cloth 3 is installed inside the compression connecting rod 1. The polishing cloth 3 forms a clearance fit with the cylindrical surface of the universal bearing 5, and forms a slight interference fit with the upper spherical surface section of the universal bearing 5. This design allows the polishing cloth 3 to clean and polish the spherical surface during the deflection of the universal bearing 5, thereby maintaining the cleanliness of the bearing and reducing wear. The particle contaminants worn out from the upper part fall into the bevel groove inside the polishing cloth 3 to prevent them from being deposited in the friction pair. Subsequently, the elastic sleeve 6 is installed to achieve pre-tightening and limiting of the universal bearing 5. This step is the key to ensuring that the universal bearing 5 remains stable and accurate during movement. The particle contaminants worn out from the lower spherical surface can also be removed through the spring groove 11 of the spring sleeve 6. Finally, the compression connecting rod 1 is connected by the compression pin 4 and the compression piston 2. Here, the compression pin 4 and the compression piston 2 are connected by adhesive, which is both stable and allows a certain degree of adjustment to adapt to slight changes in movement.

[0031] Other embodiments of the utility model also disclose a Stirling refrigerator, including a motor and the above-mentioned compression assembly, wherein the motor is connected to the compression piston 2 to provide power for the compression piston 2 to reciprocate in the through groove of the compression cylinder. This embodiment adopts a structural design idea to optimize the design of the rotary Stirling refrigerator compression assembly. By combining the motor with the advanced compression assembly, this design utilizes the stability and controllability of the motor and the structural optimization of the compression assembly to jointly improve the performance of the entire refrigeration system.

[0032] The utility model provides a compression assembly, which is particularly suitable for a rotary Stirling refrigerator. Its core innovation is that this patent discloses an improved compression assembly, which is specially designed to improve the efficiency and reliability of the refrigerator. Wool felt is arranged in the connecting rod to realize the cleaning and polishing structure of the universal bearing. An elastic sleeve is adopted to realize the structural form in which the bearing and the retaining spring function are integrated, thereby reducing the space limitation of the compression connecting rod structure. At the same time, the axial size deviation of the universal bearing can be adaptively adjusted by the outer ring bevel of the elastic sleeve. These innovative designs enable the compression assembly to perform excellently in reducing wear, improving movement flexibility and enhancing structural stability, thereby significantly improving the overall performance and reliability of the refrigerator.

[0033] The above figures are only schematic illustrations of the processes included in the method according to the exemplary embodiments of the present application, and are not intended to be limiting. It is easy to understand that the processes shown in the above figures do not indicate or limit the time sequence of these processes. In addition, it is also easy to understand that these processes can be performed synchronously or asynchronously, for example, in multiple modules.

[0034] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be performed without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A compression assembly, comprising a compression piston, reciprocating in a through groove of a compression cylinder; a compression pin, transversely arranged in the inner cavity of the compression piston; a compression connecting rod, the lower end of which is connected to the compression pin, and the upper end of which extends out of the compression cylinder; characterized in that: It also includes a universal bearing and a polishing cloth located in the compression connecting rod. The inner ring of the universal bearing is sleeved and fixed on the compression pin shaft, the outer ring is fixed to the compression connecting rod, and the polishing cloth is arranged between the outer ring of the universal bearing and the compression connecting rod.

2. The compression assembly according to claim 1, characterized in that: The compression connecting rod includes a bearing hole, the inner wall of the bearing hole includes a bevel and a straight edge, the universal bearing includes an upper spherical surface, a cylindrical surface and a lower spherical surface, the upper spherical surface of the universal bearing is in tangential contact with the bevel of the bearing hole, the polishing cloth is arranged between the straight edge of the bearing hole and the cylindrical surface of the universal bearing, and the polishing cloth is clearance-matched with the cylindrical surface of the universal bearing.

3. The compression assembly according to claim 2, characterized in that: The polishing cloth and the upper spherical surface of the universal bearing are in slight interference fit.

4. The compression assembly according to any one of claims 1 to 3, characterized in that: The polishing cloth is wool felt.

5. The compression assembly according to claim 4, characterized in that: The wool felt is annular and has an oblique groove, wherein the opening of the oblique groove faces the universal bearing.

6. The compression assembly according to claim 2, characterized in that: It also includes a spring sleeve, which includes an annular fixing portion and an elastic portion extending obliquely downward from the inner ring of the fixing portion. The lower spherical surface of the universal bearing is tangent to the elastic portion of the spring sleeve.

7. The compression assembly according to claim 6, characterized in that: A positioning groove is provided on the straight side of the bearing hole, and the outer ring of the fixing part of the spring sleeve is clamped in the positioning groove and the two are interference fit.

8. The compression assembly according to claim 6, characterized in that: The elastic part is provided with spring grooves, which are evenly distributed around the circumference.

9. The compression assembly according to claim 1, characterized in that: The two ends of the compression pin are fixed to the compression piston by gluing.

10. A Stirling refrigerator, characterized in that: It comprises a motor and a compression assembly as described in any one of claims 1 to 9, wherein the motor is connected to the compression piston to provide power for the compression piston to reciprocate in the through groove of the compression cylinder.

Images