Rotor assembly of linear Stirling cryocooler

Abstract

The utility model relates to the field of linear Stirling cryocoolers, in particular to a mover assembly of a linear Stirling cryocooler, which comprises a framework, a plurality of magnetic steels distributed along the circumferential direction are arranged on the peripheral surface of the framework; the hoop is arranged on the outer surface of the magnetic steel in a sleeving manner and is used for fixing the magnetic steel on the framework; the framework gland is arranged at the end part of the framework and is used for tightly pressing the end surface of the magnetic steel; the compression piston has the beneficial effects that the gluing groove is formed in the matching surface of the compression piston and the magnetic steel framework, glue is coated in the gluing groove, laser welding is carried out after the glue is used for bonding, the connection strength of the compression piston and the magnetic steel framework is improved, meanwhile, the rectangular groove is formed in the outer wall of the trapezoidal magnetic steel, and the two semi-circular hoops are bonded in the groove, so that the compression piston and the magnetic steel framework are more stable. The magnetic steel sheets are connected into a whole through the two semicircular hoops, radial looseness of the magnetic steel sheets is prevented, and the magnetic steel sheets are bonded through glue after being axially pressed by the magnetic steel framework gland, so that axial looseness of the magnetic steel sheets is prevented.

Description

Technical Field

[0001] This utility model relates to the field of linear Stirling refrigerators, specifically to a moving part assembly for a linear Stirling refrigerator. Background Technology

[0002] Stirling coolers are electrically driven mechanical refrigerators that are characterized by their compact structure, small size, light weight, and high efficiency. They are widely used in infrared cooling detectors, scientific research, and aerospace fields.

[0003] The mover assembly is one of the power components for the operation of a linear Stirling refrigerator. The coil is connected to an AC power source, which generates an electromagnetic field that interacts with the magnet. As the AC power changes, it controls the reciprocating motion of the refrigerator's mover.

[0004] Linear Stirling refrigerators are compact in structure, operate for long periods, and are difficult to maintain. Therefore, they require high reliability and stability. The magnets and the magnet frame are glued together, while the compression piston is laser-welded to the magnet frame. Since the mover assembly is one of the power components for the operation of the linear Stirling refrigerator, the magnets, the magnet frame, and the compression piston are constantly subjected to force, which can easily lead to the magnets loosening and the compression piston falling off. Utility Model Content

[0005] The purpose of this invention is to provide a mover assembly for a linear 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 mover assembly for a linear Stirling refrigerator includes:

[0008] A skeleton, wherein a plurality of magnets are provided on the outer peripheral surface of the skeleton;

[0009] A ring clamp is fitted onto the outer surface of the magnet and is used to fix the magnet onto the frame.

[0010] A frame cover is disposed at the end of the frame and is used to press the end face of the magnet.

[0011] Preferably, the magnet is an arc-shaped strip, and the projection of the magnet on the radial plane is trapezoidal.

[0012] Preferably, each of the magnets has at least one groove formed on its outer surface, and the ring is fitted inside the groove.

[0013] Preferably, the ring is a semi-circular arc structure, and two rings are provided on the same circumferential plane, with the ends of the two rings connected to each other.

[0014] Preferably, each of the magnets and the frame is coated with adhesive, and each of the magnets is pre-connected to the frame by the adhesive.

[0015] Preferably, adhesive is applied between the ring and the groove to pre-connect the ring and the groove.

[0016] Preferably, the frame cap includes a hollow annular cap, the center of the cap having an annular first connecting portion extending away from the frame, and the outer edge of the cap having an annular second connecting portion extending close to the frame, the second connecting portion being used to press the end face of the magnet.

[0017] Preferably, a leaf spring is engaged with the end face of the first connecting part, and the leaf spring has a hollow annular structure.

[0018] Preferably, a compression piston is inserted into the interior of the skeleton cover, and one end of the compression piston is inserted into the interior of the first connecting part.

[0019] Preferably, the end of the compression piston is provided with a coating groove at the internal position corresponding to the first connecting part, and the inside of the coating groove is coated with glue.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] 1. The mating surfaces of the compression piston and the magnetic steel frame are provided with glue grooves. The glue grooves are coated with glue, and then laser welding is performed after the glue is used to bond them together, which increases the connection strength between the compression piston and the magnetic steel frame.

[0022] 2. The magnets are set in a trapezoidal shape. Because the magnets repel each other, after the first magnet is installed, the distance between the two magnets will be less than the width of the magnet, making it more difficult to assemble the last magnet. However, if trapezoidal magnets are used, it is easier to assemble them with the narrower end.

[0023] 3. A rectangular groove is provided on the outer wall of the trapezoidal magnet. Two semi-circular rings are bonded in the groove, and the two semi-circular rings connect the sheet magnets into one piece to prevent the magnets from loosening radially.

[0024] 4. After the magnet is axially pressed together, the magnet frame cap is glued to prevent the magnet from loosening axially. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the moving part assembly structure of this utility model;

[0026] Figure 2 This is a cross-sectional schematic diagram of the moving part assembly structure of this utility model;

[0027] Figure 3This is a schematic diagram of the rectangular magnet assembly of this utility model;

[0028] Figure 4 This is a schematic diagram of the assembly of the trapezoidal magnet of this utility model.

[0029] In the diagram: 1. Frame; 2. Ring; 3. Magnet; 4. Frame cover; 41. First connecting part; 42. Second connecting part; 5. Leaf spring; 6. Compression piston; 7. Glue application groove; 8. Groove. Detailed Implementation

[0030] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] Example 1:

[0036] Please see Figures 1 to 4 This utility model provides a technical solution: a moving part assembly for a linear Stirling refrigerator, comprising:

[0037] The frame 1 has multiple magnets 3 distributed circumferentially on its outer periphery.

[0038] Ring 2, ring 2 is fitted on the outer surface of magnet 3, and is used to fix magnet 3 to frame 1;

[0039] The frame cover 4 is located at the end of the frame 1 and is used to press the end face of the magnet 3.

[0040] Specifically, there can be 6 magnets 3. The 6 magnets 3 are fixed to the frame 1 as a whole by the ring 2 to prevent the magnets 3 from loosening radially. At the same time, the magnets 3 are axially pressed by the frame cover 4 to prevent the magnets 3 from loosening axially.

[0041] Example 2:

[0042] like Figures 2 to 4 As shown, the moving part assembly of the linear Stirling refrigerator disclosed in Embodiment 2 of this utility model has a structure that is basically the same as that in Embodiment 1, except that:

[0043] Magnet 3 is an arc-shaped strip, and the projection of magnet 3 on the radial plane is trapezoidal.

[0044] Due to the interaction force between magnets 3, after the first 5 magnets 3 are installed, the distance between two magnets 3 will be less than the width of magnet 3, making it more difficult to assemble the last magnet 3. Using trapezoidal magnets 3, it is easier to assemble with the narrower end.

[0045] Specifically, each magnet 3 has at least one groove 8 formed on its outer surface, and the ring 2 is fitted into the groove 8. After installation, the outer surface of the ring 2 is flush with the outer surface of the magnet 3.

[0046] Specifically, the ring 2 has an arc-shaped structure, and two ring 2 can be set on the same circumferential plane, with the two ring 2 arranged symmetrically along the axial direction of the skeleton 1.

[0047] Specifically, the ring 2 can be glued into the groove 8 to connect the 6 magnets 3 into one piece and prevent the magnets 3 from loosening radially.

[0048] Specifically, multiple sets of grooves 8 can be provided, and the fixation of the magnet 3 can be further strengthened through the cooperation of multiple sets of grooves 8 and the internal ring 2.

[0049] Specifically, each magnet 3 and the frame 1 are coated with glue, and each magnet 3 is pre-connected to the frame 1 by the glue.

[0050] Specifically, the frame cover 4 includes a hollow annular cover body, the center of which has an annular first connecting portion 41 extending away from the frame 1, and the outer edge of which has an annular second connecting portion 42 extending close to the frame, the second connecting portion 42 being used to press the end face of the magnet 3.

[0051] Specifically, a leaf spring 5 is engaged with the end face of the first connecting part 41, and the leaf spring 5 has a hollow annular structure.

[0052] Specifically, the leaf spring 5 and the frame cover 4 can be pre-connected with glue and then welded.

[0053] A compression piston 6 is inserted into the inside of the skeleton cover 4, and one end of the compression piston 6 is connected to the top of the skeleton cover 4.

[0054] A glue-applying groove 7 is provided at the end of the compression piston 6 corresponding to the end of the skeleton cover 4. The glue-applying groove 7 is annular and is coated with glue. The compression piston 6 is fixed inside the skeleton cover 4 by the glue.

[0055] 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.

[0056] 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 mover assembly for a linear Stirling refrigerator, characterized in that, include: A skeleton (1) is provided with a plurality of circumferentially distributed magnets (3) on its outer peripheral surface. Ring hoop (2), the ring hoop (2) is sleeved on the outer surface of the magnet (3) and is used to fix the magnet (3) on the frame (1); A frame cover (4) is provided at the end of the frame (1) and is used to press the end face of the magnet (3).

2. The mover assembly of the linear Stirling refrigerator according to claim 1, characterized in that, The magnet (3) is an arc-shaped strip, and the projection of the magnet (3) on the radial plane is trapezoidal.

3. The mover assembly of the linear Stirling refrigerator according to claim 2, characterized in that, Each of the magnets (3) has at least one groove (8) formed on its outer surface, and the ring (2) is fitted inside the groove (8).

4. The mover assembly of the linear Stirling refrigerator according to claim 3, characterized in that, The ring (2) is a semi-circular arc structure, and two rings (2) are set on the same circumferential plane, with the ends of the two rings (2) connected to each other.

5. The mover assembly of the linear Stirling refrigerator according to claim 1, characterized in that, Adhesive is applied between each of the magnets (3) and the frame (1), and each of the magnets (3) is pre-connected to the frame (1) by the adhesive.

6. The mover assembly of the linear Stirling refrigerator according to claim 3, characterized in that, Adhesive is applied between the ring (2) and the groove (8) to pre-connect the ring (2) and the groove (8).

7. The mover assembly of the linear Stirling refrigerator according to claim 1, characterized in that, The frame cover (4) includes a hollow annular cover body. The center of the cover body has an annular first connecting part (41) extending in a direction away from the frame (1). The outer edge of the cover body has an annular second connecting part (42) extending in a direction close to the frame. The second connecting part (42) is used to press the end face of the magnet (3).

8. The mover assembly of the linear Stirling refrigerator according to claim 7, characterized in that, A leaf spring (5) is snapped onto the end face of the first connecting part (41), and the leaf spring (5) has a hollow ring structure.

9. The mover assembly of the linear Stirling refrigerator according to claim 7, characterized in that, A compression piston (6) is inserted into the inside of the skeleton cover (4), and one end of the compression piston (6) is inserted into the inside of the first connecting part (41).

10. The mover assembly of the linear Stirling refrigerator according to claim 9, characterized in that, The end of the compression piston (6) is provided with a glue-coating groove (7) at the internal position of the first connecting part (41), and the inside of the glue-coating groove (7) is coated with glue.

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