End cover assembly and Stirling refrigerator

Abstract

The end cover assembly comprises a cover body, the cover body is connected with a machine base of the Stirling cryocooler and covers the end portion of a compressor, a vent groove is formed in the cover body in the radial direction, and the vent groove is communicated with a compression cavity of the compressor and a machine base vent hole formed in the machine base. The vent groove is formed in the cover body, so that impact on the air cylinder is reduced, air cylinder deviation is avoided, meanwhile, abrasion objects generated when the piston moves in the air cylinder are adsorbed through the magnetic adsorption part, the abrasion objects are prevented from entering components such as padding, a bearing and a friction pair, and the movement trend of the air cylinder is weakened or even offset through magnetic attraction force; and micro motion of the air cylinder is effectively inhibited.

Description

Technical Field

[0001] The utility model relates to the field of Stirling refrigerators, in particular to an end cover assembly and a Stirling refrigerator. Background Art

[0002] The patent application with the application number 201610502384.6 and the patent name "Rotary Double-Piston Compressor and Stirling Refrigeration Device" has two gas paths, both of which converge at the air holes on the machine base, and each gas path includes a first channel located on the corresponding cylinder and a second channel located on the machine base, and the first channel is communicated with the second channel.

[0003] However, in the above structural design, since the first channel is opened on the cylinder, when the refrigerant gas flow passes through or stays, it will generate an impact force on the cylinder, resulting in unbalanced movement of the cylinder. Moreover, during the movement of the piston, the pollutants generated by wear will partially enter components such as the energy storage wire mesh, bearings, and friction pairs along with the gas flow, affecting the refrigeration performance, the operating life of the bearings, and the movement state of the friction pairs. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an end cover assembly and a Stirling refrigerator, which open the ventilation groove on the cover body to reduce the impact on the cylinder and avoid the cylinder from shifting. At the same time, the magnetic adsorbing parts are used to adsorb the wear debris generated during the movement of the piston in the cylinder, preventing the wear debris from entering components such as the packing, bearings, and friction pairs, and weakening or even offsetting the movement tendency of the cylinder through the magnetic attraction force, thereby effectively suppressing the micro-movement of the cylinder.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] On the one hand, an end cover assembly is provided, which includes:

[0007] A cover body, which is connected to the machine base of the Stirling refrigerator and covers the end of the compressor. The cover body is provided with a ventilation groove along the radial direction, and the ventilation groove communicates with the compression chamber of the compressor and the machine base ventilation hole opened on the machine base.

[0008] Preferably, one end of the ventilation groove communicating with the compression chamber is located at the center of the cover body and corresponds to the center of the piston.

[0009] Preferably, the end cover assembly further includes:

[0010] A first installation groove, which is opened on the cover body;

[0011] A first magnetic adsorbing part, which is completely accommodated in the first installation groove as a whole and adsorbs to the cylinder of the compressor.

[0012] Preferably, a receiving cavity for collecting wear debris is formed between the first magnetic attachment and the first mounting groove.

[0013] Preferably, the first magnetic attachment is integrally of a stepped structure, and the end portion facing the inner wall surface of the first mounting groove abuts against the inner wall surface of the first mounting groove to form the receiving cavity.

[0014] Preferably, the first mounting groove is integrally of an arc-shaped or circular structure, the shape of the first magnetic attachment matches that of the first mounting groove, and the inner diameter of the first magnetic attachment is smaller than the inner diameter of the cylinder.

[0015] Preferably, the end cap assembly further includes:

[0016] a second mounting groove formed on the side wall of the ventilation groove;

[0017] and a second magnetic attachment that is entirely received in the second mounting groove and is used for adsorbing wear debris in the gas flowing in the ventilation groove.

[0018] Preferably, a plurality of second mounting grooves are correspondingly formed on the side walls on both sides of the ventilation groove, and at least one second magnetic attachment is correspondingly received in each second mounting groove.

[0019] On the other hand, a Stirling refrigerator is further provided, which includes:

[0020] a machine base provided with a machine base ventilation hole and a compressor installation space;

[0021] the above-mentioned end cap assembly, the cover of which is connected to the machine base and covers the end of the compressor;

[0022] a compressor installed in the compressor installation space.

[0023] Preferably, the Stirling refrigerator further includes:

[0024] an O-shaped buffer member installed in the compressor installation space and located between a stepped portion formed on the inner wall surface of the machine base and an extension portion formed on the outer wall surface of the cylinder;

[0025] and a seal installed in a seal installation groove formed on the surface of the machine base and pressed by the end cap assembly.

[0026] In summary, the present utility model has the following beneficial effects compared with the prior art:

[0027] In the present utility model, the ventilation groove is formed on the cover instead of directly on the cylinder, so that the working medium gas flows through the cover, and the reaction force generated by the air flow will not be transmitted to the cylinder, thereby reducing the impact on the cylinder and avoiding the offset of the cylinder;

[0028] Meanwhile, wear debris generated during the movement of the piston adsorbed by the magnetic adsorbent in the cylinder is prevented from entering components such as packings, bearings, and friction pairs, so as to ensure the working performance of the components, extend the service life of the refrigerator, and the magnetic attraction generated by the first magnetic adsorbent weakens or even cancels the movement tendency of the cylinder, thereby effectively suppressing the micro-movement of the cylinder. Brief Description of the Drawings

[0029] Figure 1 It is a cross-sectional view of the end cover assembly in the present utility model.

[0030] Figure 2 It is an overall structure diagram of the cover body in the present utility model.

[0031] Figure 3 It is a partial structure diagram of the cover body in the present utility model.

[0032] Figure 4 It is an overall structure diagram of the first magnetic adsorbent in the present utility model. Detailed Embodiments

[0033] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0034] Embodiment 1

[0035] As Figure 1 shown, this embodiment provides an end cover assembly 2, which includes:

[0036] A cover body 2-3, which is detachably connected to the base 1 of the Stirling refrigerator through components such as screws and covers the end of the compressor. The cover body 2-3 is provided with a ventilation groove 2-1 along the radial direction, and the ventilation groove 2-1 is respectively communicated with the base ventilation hole 1-3 opened on the base 1 and the compression chamber 1-4 of the compressor. The base ventilation hole 1-3 is communicated with the guiding end 1-2 (such as an expander);

[0037] In this embodiment, the compressor includes a compression chamber 1-4, a cylinder 3, and a piston 4 installed in the cylinder 3. During operation, a crank (not shown) drives the piston 4 of the Stirling refrigerator to perform a linear reciprocating motion in the cylinder 3 (i.e., Figure 1 the direction indicated by the double-headed arrow), and when the piston 4 compresses the gas, the gas flows through the ventilation groove 2-1 and the base ventilation hole 1-3 in sequence and then enters the guiding end 1-2 to form a refrigeration effect.

[0038] Thus, in this embodiment, the ventilation groove 2-1 is formed on the cover body 2-3 instead of directly on the cylinder 3, so that the working medium gas for refrigeration flows through the cover body 2-3, and the reaction force generated by the air flow will not be transmitted to the cylinder 3, thereby reducing the impact on the cylinder 3, maintaining the stable position of the cylinder 3, and preventing the cylinder 3 from shifting.

[0039] Preferably, one end of the ventilation groove 2-1 communicating with the compression chamber 1-4 is located at the center of the cover body 2-3 and corresponds to the center of the piston 4. Therefore, when the air flow moves, the reaction force generated on the piston 4 will also be applied to the central position of the piston 4, without affecting the movement balance of the piston 4.

[0040] Embodiment 2:

[0041] The difference between this embodiment and Embodiment 1 is only that, as Figures 2-3 shown, the end cover assembly 2 further includes:

[0042] A first installation groove 2-5, which is formed on the cover body 2-3, can intersect with the ventilation groove 2-1 and is in communication with the ventilation groove 2-1. Preferably, the first installation groove 2-5 is integrally in an arc or circular structure, and the center of the circle corresponding to the arc-shaped first installation groove 2-5 coincides with the position of the end of the ventilation groove 2-1 communicating with the cylinder 3;

[0043] A first magnetic attachment 2-4, which is entirely accommodated in the first installation groove 2-5 and applies a magnetic attraction force to the cylinder 3 to adsorb to the cylinder 3 of the compressor. At the same time, a receiving cavity 2-6 for collecting wear debris generated by the movement of the piston 4 is formed between the first magnetic attachment 2-4 and the first installation groove 2-5. For example, in this embodiment, as Figure 4 shown, the first magnetic attachment 2-4 is integrally in a stepped structure, and the end facing the inner wall surface of the first installation groove 2-5 abuts against the inner wall surface of the first installation groove 2-5 to form the receiving cavity 2-6; at the same time, the shape of the first magnetic attachment 2-4 matches the first installation groove 2-5 (that is, the overall shape of the first magnetic attachment 2-4 is also in an arc or circular structure), and the inner diameter of the first magnetic attachment 2-4 is smaller than the inner diameter of the cylinder 3. Thus, it can be ensured that the wear debris generated when the piston 4 moves in the cylinder 3 can fully and completely enter the receiving cavity 2-6 under the adsorption action of the first magnetic attachment 2-4; at the same time, when the piston 4 moves to the left, the sliding friction force between the piston 4 and the cylinder 3 drives the cylinder 3 to move to the left, and the magnetic attraction force generated by the first magnetic attachment 2-4 can weaken or even offset the movement tendency of the cylinder 3, thereby effectively suppressing the micro-movement of the cylinder 3;

[0044] A second mounting groove 2-7, which is provided on the side wall of the ventilation groove 2-1;

[0045] and a second magnetic adsorption member 2-2 (which may be a block structure), which is completely accommodated in the second mounting groove 2-7 and is used to adsorb wear materials in the gas flowing in the ventilation groove 2-1;

[0046] In this embodiment, a plurality of second mounting grooves 2-7 are correspondingly formed on the side walls on both sides of the ventilation groove 2-1, and each second mounting groove 2-6 correspondingly accommodates at least one second magnetic adsorption component 2-2.

[0047] Therefore, this embodiment uses the magnetic adsorption component to adsorb the wear materials generated when the piston 4 moves in the cylinder 3, thereby preventing the wear materials from entering the filler, bearings, friction pairs and other components, so as to ensure the working performance of the components and improve the life of the refrigerator. At the same time, the magnetic attraction generated by the first magnetic adsorption component 2-4 weakens or even offsets the movement trend of the cylinder 3, thereby effectively suppressing the micro-motion of the cylinder 3.

[0048] Embodiment 3:

[0049] This embodiment provides a Stirling refrigerator, such as Figure 1 As shown, it includes:

[0050] A machine base 1 is provided with a machine base vent hole 1-3 and a compressor installation space 1-1, and a step portion 11 is formed on the inner wall surface of the machine base 1;

[0051] The end cover assembly 2 described in embodiment 1 or 2, wherein the cover body 2-3 is detachably connected to the base 1 by means of screws or other components;

[0052] And a compressor, which is installed in the compressor installation space 1-1, and the compressor installation space 1-1 is interconnected with the compression chamber 1-4.

[0053] Specifically, the compressor comprises:

[0054] Compression chamber 1-4;

[0055] A cylinder 3, which is installed in the compressor installation space 1-1 and has an extension portion 31 formed on its outer wall;

[0056] A piston 4 installed in the cylinder 3;

[0057] The O-shaped buffer 5 is installed in the compressor installation space 1-1 and is located between the stepped portion 11 and the extending portion 31. Thus, when the piston 4 moves to the left and the sliding friction force between the piston 4 and the cylinder 3 drives the cylinder 3 to move to the left, the extending portion 31 of the cylinder 3 exerts a pressure on the O-shaped buffer 5, causing the O-shaped buffer 5 to deform and further exerting a force on the cylinder 3 in the direction opposite to its movement to buffer the movement of the cylinder 3.

[0058] And the seal 6 is installed in the seal installation groove formed on the surface of the machine base 1 and is pressed by the end cover assembly 2.

[0059] In summary, in the present utility model, the ventilation groove is opened on the cover body instead of directly on the cylinder, so that the working medium gas flows through the cover body, and the reaction force generated by the airflow will not be transmitted to the cylinder, thereby reducing the impact on the cylinder and avoiding the offset of the cylinder. At the same time, the wear debris generated during the movement of the piston in the cylinder is adsorbed by the magnetic adsorbent, preventing the wear debris from entering components such as the packing, bearings, and friction pairs, so as to ensure the working performance of the components, extend the service life of the refrigerator, and the magnetic attraction force generated by the first magnetic adsorbent weakens or even cancels the movement tendency of the cylinder, thereby effectively suppressing the micro-movement of the cylinder.

[0060] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. An end cap assembly, characterized in that, Comprising: A cover body, which is connected to the base of the Stirling refrigerator and covers the end of the compressor. The cover body is provided with a ventilation groove in the radial direction, and the ventilation groove communicates with the compression chamber of the compressor and the base ventilation hole opened on the base.

2. The end cap assembly according to claim 1, characterized in that, One end of the ventilation groove that communicates with the compression chamber is located at the center of the cover body and corresponds to the center of the piston.

3. The end cap assembly according to claim 1, wherein The end cover assembly further comprises: A first installation groove, which is opened on the cover body; A first magnetic attachment, which is entirely and completely accommodated in the first installation groove and adsorbs to the cylinder of the compressor.

4. The end cap assembly according to claim 3, characterized in that, A receiving cavity for collecting wear debris is formed between the first magnetic attachment and the first installation groove.

5. The end cap assembly according to claim 4, wherein The first magnetic attachment is of a stepped structure as a whole, and the end portion facing the inner wall surface of the first installation groove abuts against the inner wall surface of the first installation groove to form the receiving cavity.

6. The end cap assembly according to claim 3, wherein, The first installation groove is of an arc-shaped or circular structure as a whole. The shape of the first magnetic attachment matches that of the first installation groove, and the inner diameter of the first magnetic attachment is smaller than the inner diameter of the cylinder.

7. The end cap assembly according to claim 1, characterized in that The end cover assembly further comprises: A second installation groove, which is opened on the side wall of the ventilation groove; And a second magnetic attachment, which is entirely and completely accommodated in the second installation groove and is used to adsorb the wear debris in the gas flowing in the ventilation groove.

8. The end cap assembly according to claim 7, characterized in that, A plurality of second installation grooves are correspondingly opened on both side walls of the ventilation groove, and at least one second magnetic attachment is correspondingly accommodated in each second installation groove.

9. A Stirling refrigerator, characterized in that, Comprising: A base, which is provided with a base ventilation hole and a compressor installation space; The end cover assembly according to any one of claims 1-8, the cover body of which is connected to the base and covers the end of the compressor; A compressor, which is installed in the compressor installation space.

10. The Stirling refrigerator according to claim 9, characterized in that, The Stirling refrigerator further comprises: An O-shaped buffer, which is installed in the compressor installation space and is located between the stepped portion formed on the inner wall surface of the base and the extending portion formed on the outer wall surface of the cylinder; And a seal, which is installed in the seal installation groove opened on the surface of the base and is pressed by the end cover assembly.

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