Regenerator and Stirling refrigerator

Abstract

The utility model discloses a regenerator and a Stirling cryocooler. Comprising a regenerator shell, a first silk screen unit, a second silk screen unit and a third silk screen unit are sequentially arranged in the regenerator shell from the regenerator hot end to the regenerator cold end, and the number of silk screens filled in the second silk screen unit is smaller than the number of silk screens filled in the first silk screen unit and the number of silk screens filled in the third silk screen unit. The first silk screen unit, the second silk screen unit and the third silk screen unit are sequentially arranged in the regenerator shell and are filled with silk screens with different mesh numbers, particularly, the second silk screen unit is filled with silk screens with small mesh numbers, and the silk screens with large pore diameters are used for reducing the influence on blockage of the silk screens when water vapor is condensed; the risk that the silk screen is blocked due to water vapor pollution can be reduced or improved, and then the reliability of long-time operation of the refrigerator is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cold accumulators, in particular to a cold accumulator and a Stirling refrigerator. Background Art

[0002] Stirling refrigerators, with their compact structure, small size, light weight, and high efficiency, are ideal cooling sources for devices such as infrared detectors and superconducting filters, and are widely used in the cryogenic industry, scientific research, and military fields. The regenerator, a key component of the Stirling refrigerator's expander, consists of several layers of metal mesh with a defined porosity stacked from the hot end to the cold end to ensure effective heat recovery of the helium working medium as it flows through the regenerator.

[0003] Existing regenerators are filled with a metal mesh with a single porosity. Stirling refrigerators are filled with high-purity helium as a working fluid, utilizing the periodic expansion of the working fluid to cool the cold end of the regenerator. However, various metal and non-metallic components within the refrigerator continuously release condensable gases. Due to the very low temperature at the cold end during operation, these condensable gases gradually accumulate and condense in specific areas of the regenerator mesh, reducing the Stirling refrigerator's heat recovery efficiency, cooling performance, and even causing it to not reach the desired temperature, seriously impacting the refrigerator's reliability and lifespan. Utility Model Content

[0004] In order to solve the above problems, on the one hand, the utility model provides a cold storage device, including a cold storage device shell, in which a first wire mesh unit, a second wire mesh unit and a third wire mesh unit are arranged in sequence from the hot end to the cold end of the cold storage device in the cold storage device shell, and the mesh number of the wire mesh filled in the second wire mesh unit is smaller than the mesh number of the wire mesh filled in the first wire mesh unit and the third wire mesh unit.

[0005] Furthermore, the mesh size of the wire mesh filled in the second wire mesh unit is 100 to 200 meshes.

[0006] Furthermore, the mesh size of the wire mesh filled in the first wire mesh unit is 300 to 600 meshes.

[0007] Furthermore, the mesh size of the wire mesh filled in the third wire mesh unit is 300 to 600 meshes.

[0008] Furthermore, the length of the second screen unit does not exceed 10 mm.

[0009] Furthermore, the second screen unit is filled with screens of at least two different mesh sizes.

[0010] Furthermore, the distance between the second wire mesh unit and the hot end of the cold storage device is L1, L1 = L*(T a -T c ) / (Ta -T1), where T a is the hot end temperature of the cold storage device, T c is the cold end temperature of the cold storage tank, T1 is the temperature of the second wire mesh unit, and L is the total length of the wire mesh filled in the cold storage tank shell.

[0011] Furthermore, the wire meshes filled in the first wire mesh unit, the second wire mesh unit and the third wire mesh unit are all metal wire meshes.

[0012] Furthermore, the cold storage device shell is a non-metallic shell.

[0013] On the other hand, the present invention also provides a Stirling refrigerator, comprising the cold storage device as described above.

[0014] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0015] The cold storage device provided by the utility model is provided with a first wire mesh unit, a second wire mesh unit and a third wire mesh unit in sequence in the cold storage device shell, which are filled with wire meshes of different mesh sizes, especially the second wire mesh unit is filled with wire meshes of small mesh size. The wire meshes with large apertures are used to reduce the effect of water vapor condensation on the clogging of the wire mesh, which can reduce or improve the risk of clogging of the wire mesh due to water vapor contamination, thereby improving the reliability of the long-term operation of the refrigerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1 This is a structural schematic diagram of the cold storage device provided by the utility model.

[0018] 1-cold storage housing; 2-first wire mesh unit; 3-second wire mesh unit; 4-third wire mesh unit. DETAILED DESCRIPTION

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] Example 1

[0024] As the instruction manual Figure 1 As shown, the utility model provides a cold accumulator, including a cold accumulator shell 1, in which a first wire mesh unit 2, a second wire mesh unit 3 and a third wire mesh unit 4 are sequentially arranged from the hot end to the cold end of the cold accumulator. The mesh number of the wire mesh filled in the second wire mesh unit 3 is smaller than the mesh number of the wire mesh filled in the first wire mesh unit 2 and the third wire mesh unit 3.

[0025] Specifically, the condensable gas inside the refrigerator is mainly water vapor. When filling the cold storage mesh, it is necessary to consider the solidification temperature of water vapor under the partial pressure of the refrigerator working fluid gas. The temperature change from the cold end to the hot end of the cold storage is linearly distributed. Combining the cold end temperature and the hot end temperature of the cold storage, the solidification range of water vapor in the cold storage shell can be obtained. The second wire mesh unit 3 is the water vapor solidification range. The mesh number filled in the determined second wire mesh unit 3 is smaller than the mesh number of the wire mesh in other areas of the cold storage shell. The smaller the mesh number, the larger the aperture, which can effectively reduce the impact of water vapor condensation on the wire mesh clogging. At the same time, by filling the first wire mesh unit 2 and the third wire mesh unit 4 with wire meshes of different mesh numbers, the heat exchange efficiency of the working fluid gas flowing through the wire mesh can be further guaranteed, thereby improving the reliability of the long-term operation of the refrigerator.

[0026] As the instruction manual Figure 1 As shown in the figure, the left end of the cold accumulator shell 1 is the hot end of the cold accumulator, and the right end is the cold end of the cold accumulator. The wire mesh in the cold accumulator shell 1 is stacked and filled in sequence along the horizontal direction.

[0027] In an optimized implementation manner, the mesh size of the wire mesh filled in the second wire mesh unit 3 is 100 to 200 meshes.

[0028] In an optimized implementation manner, the mesh size of the wire mesh filled in the first wire mesh unit 2 is 300 to 600 meshes.

[0029] In an optimized implementation mode, the mesh size of the wire mesh filled in the third wire mesh unit 4 is 300 to 600 meshes.

[0030] Preferably, the wire meshes filled in the first wire mesh unit 2, the second wire mesh unit 3 and the third wire mesh unit 4 are all metal wire meshes, and can be stainless steel wire meshes or metal wire meshes with high thermal conductivity.

[0031] In this embodiment, the second wire mesh unit 3 can be filled with a wire mesh of a single mesh size, or with wire meshes of several different mesh sizes, and the mesh sizes of the wire meshes filled therein are all smaller than the mesh sizes of the wire meshes in the first wire mesh unit 2 and the third wire mesh unit 4. Of course, the first wire mesh unit 2 can be filled with a wire mesh of a single mesh size, or with wire meshes of several different mesh sizes. The third wire mesh unit 4 can be filled with a wire mesh of a single mesh size, or with wire meshes of several different mesh sizes. This prevents water vapor from condensing in the water vapor condensation zone and clogging the wire mesh, while also ensuring the heat exchange efficiency of the working gas when it flows through the wire mesh in the cold storage housing 1.

[0032] In an optimized implementation method, the second wire mesh unit 3 is filled with at least two wire meshes of different mesh sizes, and a combination of wire meshes of different mesh sizes is filled in the second wire mesh unit 3, which can improve the heat exchange efficiency of the working gas while reducing the clogging of the wire mesh due to water vapor contamination.

[0033] In one embodiment, the second screen unit 3 is filled with two screens of different mesh sizes, and the mesh sizes of the two screens are both 100 to 200. The mesh size of the screen near the hot end of the regenerator in the second screen unit 3 is larger than the mesh size of the screen near the cold end of the regenerator.

[0034] In one embodiment, the second wire mesh unit 3 is filled with three or more wire meshes of different mesh sizes, and the mesh size of each type of wire mesh is 100 to 200. The mesh size of the wire mesh filled in the second wire mesh unit 3 gradually decreases from the hot end to the cold end of the cold storage device.

[0035] In an optimized embodiment, the position of the second wire mesh unit 3 in the cold storage housing 1 can be calculated by the following formula:

[0036] L1=L*(T a -T c ) / (T a -T1) Formula 1)

[0037] In formula 1), L1 is the distance between the second screen unit 3 and the hot end of the cold storage device, T a is the hot end temperature of the cold storage device, T c is the cold end temperature of the cold storage tank, T1 is the temperature of the second wire mesh unit, and L is the total length of the wire mesh filled in the cold storage tank shell.

[0038] The position of the second wire mesh unit 3 in the cold storage housing 1 can be obtained by the above formula 1, and the wire mesh can be filled.

[0039] In an optimized implementation manner, the length of the second screen unit 3 is 8 to 12 mm, that is, the thickness of the screen layer filled in the second screen unit 3 is 8 to 12 mm.

[0040] In one embodiment, the distance L1 between the second wire mesh unit 3 and the hot end of the cold storage device is calculated by formula 1. Taking into account the temperature error and the comprehensive volume of the wire mesh in the water vapor condensation zone, the wire mesh filling area in the second wire mesh unit 3 is (L1-5) mm to (L1+5) mm.

[0041] In an optimized implementation manner, the wire meshes filled in the first wire mesh unit 2, the second wire mesh unit 3 and the third wire mesh unit 4 are all stainless steel wire meshes, and the mesh number of the stainless steel wire meshes is 100 mesh to 600 mesh.

[0042] In an optimized implementation manner, the cold storage device housing 1 is a non-metallic housing, such as a Peek housing (Peek is polyetheretherketone).

[0043] In the utility model, by filling the cold storage shell of the refrigerator with wire meshes of different mesh sizes, especially filling the water vapor condensation area with wire meshes of small mesh sizes, the risk of wire mesh being blocked due to water vapor contamination can be reduced or improved. This method is simple to operate and improves the reliability of the long-term operation of the refrigerator.

[0044] Example 2

[0045] The present invention also provides a Stirling refrigerator, which includes the cold storage device as described in Example 1.

[0046] 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.

[0047] 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 cold storage device, comprising a cold storage device housing, characterized in that: A first wire mesh unit, a second wire mesh unit and a third wire mesh unit are sequentially arranged in the cold storage shell from the hot end to the cold end of the cold storage, and the mesh number of the wire mesh filled in the second wire mesh unit is smaller than the mesh number of the wire mesh filled in the first wire mesh unit and the third wire mesh unit.

2. The cold storage device according to claim 1, characterized in that The mesh size of the wire mesh filled in the second wire mesh unit is 100 to 200 meshes.

3. The cold storage device according to claim 1, characterized in that The mesh size of the wire mesh filled in the first wire mesh unit is 300 to 600 meshes.

4. The cold storage device according to claim 1, characterized in that The mesh number of the wire mesh filled in the third wire mesh unit is 300 to 600 meshes.

5. The cold storage device according to claim 1, characterized in that The length of the second screen unit does not exceed 10 mm.

6. The cold storage device according to claim 1, characterized in that The second wire mesh unit is filled with at least two wire meshes of different mesh sizes.

7. The cold storage device according to claim 1, characterized in that The distance between the second wire mesh unit and the hot end of the cold storage device is L1, L1 = L*(T a -T c ) / (T a -T1), where T a is the hot end temperature of the cold storage device, T c is the cold end temperature of the cold storage tank, T1 is the temperature of the second wire mesh unit, and L is the total length of the wire mesh filled in the cold storage tank shell.

8. The cold storage device according to claim 1, characterized in that The wire meshes filled in the first wire mesh unit, the second wire mesh unit and the third wire mesh unit are all metal wire meshes.

9. The cold storage device according to claim 1, characterized in that The cold storage device shell is a non-metal shell.

10. A Stirling refrigerator, characterized in that: The invention comprises the cold storage device according to any one of claims 1 to 9.

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