Compression end component of small linear Stirling cryocooler
By rearranging the weld position and adopting a stop structure, the problem of the compressed end shell structure of the traditional Stirling refrigerator is easily leaked and difficult to design under extreme conditions, achieving higher reliability and smaller volume.
Patent Information
- Application Number
- CN202510264584.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-07
- Publication Date
- 2025-06-20
AI Technical Summary
The compressed end shell structure of the traditional linear split-type Stirling refrigerator is prone to weld cracking under extreme usage conditions, resulting in working-quality gas leakage, and it is difficult to arrange standard threads in miniaturized design, increasing the risk of shell strength.
The new installation structure is adopted to rearrange the weld position, transfer the weld position from the end face to the outer cylindrical surface of the shell, providing a lower and shorter fixed structure, and replacing the traditional threaded structure with a stop structure to improve design flexibility and space utilization.
It effectively alleviates the problem of welds under pressure, improves the reliability and life of the shell structure, and at the same time realizes the miniaturization and lightweight of the refrigerator, reducing the risk of shell strength.
Smart Images
Figure CN120176320A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of Stirling refrigerator manufacturing and assembly, and particularly to a compression end component of a small linear Stirling refrigerator. Background Art
[0002] Based on the Stirling refrigeration cycle principle, a linear split Stirling refrigerator is driven by a linear motor to perform a reciprocating compression and expansion cycle of the working fluid gas at the compression end and the expansion end of the refrigerator, realizing the function of creating a low-temperature environment at the expansion end (the Dewar assembly coupled at the expansion end needs a low-temperature environment to work properly). The linear Stirling refrigerator has the advantages of low wear, small vibration, high reliability, etc., and is widely used in infrared thermal imaging systems.
[0003] The structure of a split linear Stirling refrigerator mainly consists of structures such as an expansion end and a compression end. The compression end adopts a moving magnet structure of a linear motor with a piston compressor, and is internally equipped with a spring support structure. This support structure is connected to the end face structure of the compression end housing by welding. The load of the reciprocating linear motion of the piston acts on the compression end housing through the spring support structure, and its general structure is as Figure 1 Figure 2 shown.
[0004] As an important component of a linear split refrigerator, the structure of the compression end housing of the refrigerator needs to ensure the realization of the following functions:
[0005] 1. Sealing: The compression end housing needs to be welded into a sealed cavity, and at the same time, the weld does not break under the reciprocating pressure load conducted by the spring structure, maintaining the working pressure of the working fluid gas in the cavity without leakage;
[0006] 2. Fixing the stationary magnet structure: By assembling with structures such as a pressure ring, etc., the stationary magnet and other structures arranged on the compression end housing structure are tightened.
[0007] Currently, the structure of the compression end housing of traditional linear split Stirling refrigerators faces the dual pressures of reliability risks and the requirements of miniaturized structural design:
[0008] 1. In practical applications, due to the fact that the welds of the housing have long borne the load brought by the reciprocating motion of the piston, cracks often occur under extreme usage conditions, resulting in the leakage of the working fluid gas in the compression end cavity and the failure of the refrigerator;
[0009] 2. Under the trend of miniaturization and lightweight design of linear split refrigerators, the internal space is becoming increasingly tense. The traditional design of arranging threads on the housing has certain requirements for the housing thickness. The selection combination of the thread diameter, height, and housing diameter size is limited. Traditional standard threads are difficult to be arranged on a smaller diameter and thinner compression end housing. At the same time, the thread grooves on the thin-walled structure increase the strength risk of the housing. Summary of the Invention
[0010] An embodiment of the present application provides a compression end component of a small linear Stirling refrigerator, which can avoid conflicts with the weld structure, prevent the fixed magnet structure from being hindered from being sleeved and arranged on the cylindrical cavity at the compression end, and provide a lower and shorter fixing structure.
[0011] An embodiment of the present application provides a compression end component of a small linear Stirling refrigerator, including:
[0012] A housing 1, on one end of which there are provided a first fixed stop 11, a first stop channel 12 and a rotation channel 13, wherein the first fixed stop 11 is used to fix a first pressure ring 111, the first stop channel 12 is used to pass through a second fixed stop 21 after the first pressure ring 111 is sleeved on one end of the housing 1, and the rotation channel 13 is used to pass through the second fixed stop 21 when the first pressure ring 111 is rotated;
[0013] The first pressure ring 111 includes the second fixed stop 21, a third fixed stop 22, and a second stop channel 23. The second fixed stop 21 is used to provide a fastening pressure to axially fix the first pressure ring 111, and the second stop channel 23 is used to pass through the first fixed stop 11 when the first pressure ring 111 is sleeved on the housing 1;
[0014] A second pressure ring 3 includes a first fastening inclined surface 31 and a threaded cylinder 32. The fastening inclined surface 31 is used to cooperate with a second fastening inclined surface 41 of a third pressure ring 4 to fasten the third pressure ring 4 and adjust concentricity, and the threaded cylinder 32 is used to cooperate with a threaded hole of the first pressure ring 111 so that the second pressure ring 3 and the first pressure ring 111 generate relative displacement to press the third pressure ring 4;
[0015] The third pressure ring 4 includes a second fastening inclined surface 41 and a third fastening inclined surface 42. The third fastening inclined surface 42 is used to cooperate with a fixed magnet to perform concentric adjustment and fastening on a moving magnet.
[0016] Optionally, it further includes an end face flange 5, including a weld position, and the weld position is arranged on the end face of the outer cylindrical surface of the housing 1.
[0017] Optionally, the height portion of the first fixed stop 11 is higher than the outer cylindrical surface of the housing 1.
[0018] Optionally, the first pressure ring 111 further includes a threaded hole, and the threaded hole is used to cooperate with the second pressure ring 3 to adjust and press the second pressure ring 3.
[0019] Optionally, the second pressure ring 3 further includes a knurled cylinder 33, and the knurled cylinder 33 is used to rotate the second pressure ring 3.
[0020] Optionally, the first fixed stop 11 is symmetrically distributed on the outer circular end face of the housing 1.
[0021] The embodiment of the present application adopts a new installation structure, rearranges the position of the weld, realizes no conflict with the weld structure, does not prevent the fixed magnet structure from being sleeved and arranged on the cylindrical cavity at the compression end, and provides a lower and shorter fixed structure.
[0022] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically describes the specific embodiments of the present application. Brief Description of the Drawings
[0023] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:
[0024] Figure 1 Schematic diagram of the structure of a split linear Stirling refrigerator in the prior art;
[0025] Figure 2 Schematic diagram of the classical structure at the compression end of a split linear Stirling refrigerator in the prior art;
[0026] Figure 3 Schematic diagram of the structure of the compression end component in the embodiment of the present application;
[0027] Figure 4 Schematic diagram of the A surface structure of the compression end component in the embodiment of the present application;
[0028] Figure 5 Schematic diagram of the housing part of the compression end component in the embodiment of the present application;
[0029] Figure 6 Schematic diagram of the first compression ring part of the compression end component in the embodiment of the present application;
[0030] Figure 7 Schematic diagram of the second compression ring part of the compression end component in the embodiment of the present application;
[0031] Figure 8 Schematic diagram of the third compression ring part of the compression end component in the embodiment of the present application;
[0032] Figure 9 Schematic diagram of the end face flange part of the compression end component in the embodiment of the present application;
[0033] Figure 10Schematic diagram of the weld length extension of the compression end component in the embodiment of the present application;
[0034] Figures 11 - 13 Usage example of the compression end component in the embodiment of the present application. Detailed implementation manners
[0035] Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be completely conveyed to those skilled in the art.
[0036] In the prior art, since the compression end housing bears the load brought by the reciprocating motion of the piston for a long time, under extreme usage conditions, the weld of the housing will crack, resulting in the leakage of the working medium gas in the compression end cavity and the failure of the refrigerator.
[0037] Since the threaded structure for installing the compression ring is arranged on the thin-walled housing, the standard thread height cannot be freely designed. At the same time, considering the strength factor, the thickness of the threaded part of the housing structure is often large, occupying the precious internal space of the compression end cavity, which is not conducive to the miniaturization and light weight of the refrigerator.
[0038] The embodiment of the present application provides a compression end component for a small linear Stirling refrigerator, as Figure 3 , Figure 4 shown, including:
[0039] A housing 1, as Figure 5 shown, having a first fixed stop 11, a first stop channel 12 and a rotation channel 13 provided at one end thereof, wherein the first fixed stop 11 is used to fix the first compression ring 111, the first stop channel 12 is used to pass through the second fixed stop 21 after the first compression ring 111 is sleeved on one end of the housing 1, and the rotation channel 13 is used to pass through the second fixed stop 21 when the first compression ring 111 is rotated. In some embodiments, the first fixed stops 11 are symmetrically distributed on the outer circular end face of the housing 1.
[0040] A first compression ring 111, as Figure 6 shown, including the second fixed stop 21, a third fixed stop 22, and a second stop channel 23. The second fixed stop 21 is used to provide a fastening pressure to axially fix the first compression ring 111, and the second stop channel 23 is used to pass through the first fixed stop 11 when the first compression ring 111 is sleeved on the housing 1.
[0041] A second compression ring 3, as Figure 7As shown, it includes a first fastening inclined surface 31 and a threaded cylinder 32. The fastening inclined surface 31 is used to cooperate with the second fastening inclined surface 41 of the third compression ring 4 to fasten the third compression ring 4 and adjust concentricity. The threaded cylinder 32 is used to cooperate with the threaded hole of the first compression ring 111, so that the second compression ring 3 and the first compression ring 111 generate relative displacement to press the third compression ring 4.
[0042] The third compression ring 4, as Figure 8 shown, includes a second fastening inclined surface 41 and a third fastening inclined surface 42. The third fastening inclined surface 42 is used to cooperate with the fixed magnet to perform concentric adjustment and fastening on the moving magnet.
[0043] In some embodiments, as Figure 8 shown, it further includes an end face flange 5, including a weld position 51. The weld position 51 is arranged on the end face of the outer cylindrical surface of the housing 1.
[0044] The embodiment of the present application adopts a new installation structure, rearranges the weld position, realizes no conflict with the weld structure, does not prevent the fixed magnet structure from being sleeved and arranged on the cylindrical cavity at the compression end, and provides a lower and shorter fixing structure.
[0045] In some embodiments, the height part of the first fixed stop 11 is higher than the outer cylindrical surface of the housing 1.
[0046] In some embodiments, the first compression ring 111 further includes a threaded hole, and the threaded hole is used to cooperate with the second compression ring 3 to adjust and press the second compression ring 3.
[0047] In some embodiments, as Figure 7 shown, the second compression ring 3 further includes a knurled cylinder 33, and the knurled cylinder 33 is used to rotate the second compression ring 3.
[0048] The components of the embodiment of the present application rearrange the weld position, as Figure 10 shown, and rearrange the weld at the end face on the outer cylindrical surface of the housing. On the one hand, it increases the weld length, so that the piston pressure is evenly distributed on a longer weld, alleviating the pressure borne by the weld per unit length; on the other hand, it improves the welding processability of the compression end housing structure at this place.
[0049] The installation structure provided by the present application meets the following technical requirements: a) does not conflict with the weld structure; b) does not prevent the fixed magnet structure from being sleeved and arranged on the cylindrical cavity at the compression end (its structure shall not be higher than the cylindrical surface); c) can provide a lower (lower than the standard thread height) and shorter fixing structure (stop structure).
[0050] The embodiment of the present application also proposes an implementation case of the compression end components of a small linear Stirling refrigerator, including the following steps:
[0051] First, the end face flange and the housing are welded through a circumferential surface weld to form a compression end chamber structure;
[0052] As Figure 11 shown, the first compression ring 111, the second compression ring 3, and the third compression ring 4 are axially assembled together through threaded holes and the first fastening inclined surface 31, where the first compression ring 111 is in close contact with the second compression ring 3.
[0053] Press the assembly obtained in the previous step against the housing to ensure that the second fixed stop 21 is located in the rotation channel 13. Rotate the first compression ring 111 to align the first fixed stop 11 and the third fixed stop 22.
[0054] As Figure 12 , Figure 13 shown, pull out the first compression ring 111 outward. After the first fixed stop 11 engages with the third fixed stop 22, rotate the second compression ring 3 (at this time, the first compression ring 111 has been fixed by the stop), so that the first compression ring 111 and the second compression ring 3 are separated in the opposite direction. The second compression ring 3 pushes the third compression ring 4 to slide towards the fixed magnet until the third compression ring 4 presses and fixes structures such as the fixed magnet, and the first compression ring 111 presses against the first fixed stop 11 of the housing.
[0055] So far, the installation of the compression end housing structure of the refrigerator is completed, and structures such as the fixed magnet are fixed.
[0056] The removal method is opposite to the installation operation. Rotate the second compression ring 3 so that the first compression ring 111 and the second compression ring 3 close together until they are in close contact. Push the first compression ring 111 and rotate it until the first fixed stop 11 is aligned with the first stop channel 12. Pull out the compression ring assembly and remove components such as the fixed magnet.
[0057] This application uses a stop structure to replace the traditional threaded structure on the housing structure. Since the height of the stop can be lower than the height provided by the standard thread, on the basis of meeting the axial fixing function of the compression ring, the height and quantity of the stops can be flexibly selected according to needs. Among the limited combinations of different housing diameters and standard thread heights, the design flexibility can be improved, the internal space of the housing cavity can be saved, which is beneficial to the miniaturization and lightweight of the refrigerator;
[0058] This application uses a new structure, making it possible to adjust the welding position of the housing under the requirements of limited structural space and weight. The welding position is transferred from the original end face to the outer circumferential surface of the housing, and the length of the weld is extended, greatly reducing the alternating load borne by the weld per unit length, and improving the service life and reliability of the refrigerator.
[0059] This application protects the weldability of the thin-walled structure. The weldability of the circumferential surface position is higher than that of the end face position. The change of the weld position reduces the requirements for welding fixtures and improves the welding processability;
[0060] During the testing process of the refrigerator, the housing structure of the present application does not affect the installation of other structures on the cylindrical surface of the housing, making it possible to frequently replace the permanent magnet and repeatedly detect and maintain the product during the refrigerator testing period.
[0061] It should be noted that in the embodiments of the present application, the terms "including", "comprising" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the presence of additional identical elements in the process, method, article or device including the element.
[0062] The serial numbers of the embodiments of the present application above are only for description and do not represent the superiority or inferiority of the embodiments.
[0063] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims. All of these are within the protection scope of the present application.
Claims
1. A small linear Stirling refrigerator compression end member, characterized in that: include: A shell (1), one end of which is provided with a first fixed stop (11), a first stop channel (12) and a rotation channel (13), wherein the first fixed stop (11) is used to fix a first pressure ring (111), the first stop channel (12) is used to pass through a second fixed stop (21) after the first pressure ring (111) is inserted into one end of the shell (1), and the rotation channel (13) is used to pass through the second fixed stop (21) when the first pressure ring (111) is rotated; The first pressure ring (111) comprises the second fixed stopper (21), a third fixed stopper (22), and a second stopper channel (23), wherein the second fixed stopper (21) is used to provide a tightening pressure to axially fix the first pressure ring (111), and the second stopper channel (23) is used to pass through the first fixed stopper (11) when the first pressure ring (111) is inserted into the housing (1); The second pressing ring (3) comprises a first fastening bevel (31) and a threaded cylinder (32), wherein the fastening bevel (31) is used to cooperate with the second fastening bevel (41) of the third pressing ring (4) to fasten the third pressing ring (4) and adjust the concentricity, and the threaded cylinder (32) is used to cooperate with the threaded hole of the first pressing ring (111) so that the second pressing ring (3) and the first pressing ring (111) generate relative displacement to press the third pressing ring (4); The third pressing ring (4) comprises a second fastening inclined surface (41) and a third fastening inclined surface (42), wherein the third fastening inclined surface (42) is used to cooperate with the fixed magnet to perform concentric adjustment and fastening on the moving magnet.
2. The small linear Stirling refrigerator compression end member according to claim 1, characterized in that: It also includes an end face flange (5) including a welding seam position, and the welding seam position is arranged on the end face of the outer cylindrical surface of the housing (1).
3. The small linear Stirling refrigerator compression end member according to claim 1, characterized in that: The height portion of the first fixed stop (11) is higher than the outer cylindrical surface of the housing (1).
4. The small linear Stirling refrigerator compression end member according to claim 1, characterized in that: The first pressing ring (111) further comprises a threaded hole, wherein the threaded hole is used to cooperate with the second pressing ring (3) to adjust and tighten the second pressing ring (3).
5. The small linear Stirling refrigerator compression end member according to claim 1, characterized in that: The second pressure ring (3) further comprises a knurled cylinder (33), and the knurled cylinder (33) is used to rotate the second pressure ring (3).
6. The small linear Stirling refrigerator compression end member according to claim 1, characterized in that: The first fixed stoppers (11) are symmetrically distributed on the outer circular end surface of the housing (1).