Flange sealing structure of Stirling cryocooler and Stirling cryocooler

Abstract

The utility model relates to a Stirling cryocooler sealing structure and a Stirling cryocooler, the Stirling cryocooler sealing structure comprises a first sealing flange, a second sealing flange, a third sealing flange and a fourth sealing flange, the first sealing flange is provided with a radial extension part and an axial extension part, and a first groove is arranged at the intersection of the radial extension part and the axial extension part; the second sealing flange is matched with the first sealing flange, and a second groove corresponding to the first groove in position is formed in the second sealing flange; and the sealing piece is integrally contained in a containing space defined by the first groove, the second groove and the peripheral face of the axial extending part so as to seal an axial matching gap between the axial extending part and the second sealing flange. The axial matching gap formed by matching of the parts is sealed through the sealing piece, so that the problem of internal gas leakage is solved, and the sealing effect is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of stirling cryocooler, especially a flange sealing structure of stirling cryocooler and stirling cryocooler. BACKGROUND

[0002] In the structure design of stirling cryocooler, usually adopt the mode that sets up the sealing groove at the flange contact surface and fills the sealing material in the sealing groove to realize the sealing effect, to prevent the gas working substance from leaking to the outside through the installation gap, for example, the patent application with the application number 202223029548.8, the patent name "a stirling cryocooler", realize the gap sealing through the mode that embeds the sealing element in the sealing groove, but in the above-mentioned sealing structure, the position of its sealing groove, sealing element is far away from the longitudinal matching place of two housings, cannot block the gap of the longitudinal matching place, and when the internal gas leaks, flows into the radial matching place through the gap of the longitudinal matching place, and then escapes, if the gap of the longitudinal matching place cannot be blocked, the source of internal gas leakage cannot be sealed, when there is assembly precision error problem, internal gas still has the possibility of leaking through the gap of the longitudinal matching place, radial matching place, lead to the sealing effect cannot reach the expectation. SUMMARY

[0003] The utility model discloses a sealing structure and stirling cryocooler of stirling cryocooler, which seals the axial matching gap formed by the cooperation of the sealing element and the components, to solve the problem of internal gas leakage and enhance the sealing effect.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0005] On the one hand, a sealing structure of stirling cryocooler is provided, which includes:

[0006] The first sealing flange has a radial extension and an axial extension, and a first groove is formed at the intersection of the radial extension and the axial extension;

[0007] The second sealing flange cooperates with the first sealing flange and has a second groove corresponding to the position of the first groove;

[0008] And a sealing element is contained in the accommodation space formed by the first groove, the second groove and the outer circumferential surface of the axial extension, to close the axial matching gap between the axial extension and the second sealing flange.

[0009] Preferably, the second sealing flange has an internal cavity that matches with the axial extension.

[0010] Preferably, the surface of the sealing member towards the outer circumferential surface of the axial extension is in contact with the outer circumferential surface of the axial extension.

[0011] Preferably, the sealing member is in the shape of a prism or a circular prism, and has a bottom surface in contact with the outer circumferential surface of the axial extension, and a top surface for closing the radial gap formed by the cooperation of the radial extension and the second sealing flange.

[0012] Preferably, the top surface closes the radial gap formed by the cooperation of the radial extension and the second sealing flange.

[0013] Preferably, a first gap is formed between the outer surface of the sealing member and the inner surface of the first groove, and a first gasket is arranged in the first gap and connected to the inner surface of the first groove and the outer surface of the sealing member.

[0014] Preferably, the first gasket is made of soft metal.

[0015] Preferably, a second gap is formed between the outer surface of the sealing member and the inner surface of the second groove, and a second gasket is arranged in the second gap and connected to the inner surface of the second groove.

[0016] Preferably, the second gasket is made of soft metal.

[0017] In another aspect, a Stirling refrigerator is also provided, which comprises the flange sealing structure.

[0018] In summary, the present application has the following advantages compared with the prior art:

[0019] The axial gap formed by the cooperation of the sealing member and the components is sealed to ensure that the gas in the internal cavity cannot flow out through the axial gap, and the radial gap is closed by the top surface of the sealing member in the shape of a prism or a circular prism, thereby further enhancing the sealing effect. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a sectional view of the sealing structure in the present application.

[0021] Figure 2 is an enlarged view of A in Example 2. Figure 1 is an enlarged view of A in Example 2.

[0022] Figure 3 is an enlarged view of A in Example 3. Figure 1 is an enlarged view of A in Example 3. DETAILED DESCRIPTION

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0024] Example 1

[0025] like Figure 1 As shown, this embodiment provides a sealing structure for a Stirling refrigerator, which includes:

[0026] The first sealing flange 1 has a radial extension 11 and an axial extension 12, and in this embodiment, the radial extension 11 and the axial extension 12 can be integrally formed.

[0027] The second sealing flange 2 has an internal cavity 21 that fits with the axial extension 12, and the free end of the axial extension 12 extends into the internal cavity 21.

[0028] And the sealing element 3, in this embodiment, the sealing element 3 can be made of materials such as rubber and plastic;

[0029] A first groove 13 is formed at the intersection of the lower end face of the radial extension 11 and the outer peripheral surface of the axial extension 12. A second groove 22 corresponding to the position of the first groove 13 is formed at the intersection of the upper end face of the second sealing flange 2 and the inner wall surface. The sealing member 3 is entirely accommodated within the accommodating space formed by the first groove 13, the second groove 22, and the outer peripheral surface of the axial extension 12. At the same time, the surface of the sealing member 3 facing the outer peripheral surface of the axial extension 12 contacts the outer peripheral surface of the axial extension 12 to close the axial fitting gap S1 between the axial extension 12 and the second sealing flange 2.

[0030] Before assembling the first sealing flange 1 and the second sealing flange 2, the upper part of the sealing element 3 can be fixed in the first groove 13 by means of bonding or other methods, and the sealing element 3 can be connected to the outer peripheral surface of the axial extension 12 by means of bonding or other methods. During assembly, the axial extension 12 is aligned with the internal cavity 21, and the axial extension 12 is inserted into the internal cavity 21. Thus, the sealing element 3 is deformed by the compression of the sealing element 3 by the second sealing flange 2, so as to close the axial fitting gap S1 between the first flange conical surface 11 and the second flange conical surface 21, thereby achieving a seal. The first sealing flange 1 and the second sealing flange 2 can then be connected by bolts or other components.

[0031] Therefore, in the embodiment, the source of leakage of the working gas, i.e. the axial fitting gap S1 between the axial extension 12 and the second sealing flange 2, is sealed by the sealing member 3, so as to ensure that the gas in the internal cavity 21 cannot flow out through the axial fitting gap S1, and fundamentally solve the problem of internal gas leakage, so as to achieve the expected sealing effect.

[0032] Embodiment 2:

[0033] The difference between the embodiment and the embodiment 1 is that, as shown in the figure, the sealing member 3 is a prism or circular prism structure as a whole, which has a bottom surface 31 in contact with the outer circumferential surface of the axial extension 12, and a top surface 32 for closing the radial fitting gap S2 formed by the cooperation of the lower end surface of the radial extension 11 and the upper end surface of the second sealing flange 2, and the bottom surface 31 and the top surface 32 are parallel to each other, so as to simultaneously close the axial fitting gap S1 and the radial fitting gap S2, thereby further enhancing the sealing effect. Figure 2 Embodiment 3:

[0034] The difference between the embodiment and the embodiment 1 is that, as shown in the figure, the sealing member 3 is a prism or circular prism structure as a whole, which has a bottom surface 31 in contact with the outer circumferential surface of the axial extension 12, and a top surface 32 for closing the radial fitting gap S2 formed by the cooperation of the lower end surface of the radial extension 11 and the upper end surface of the second sealing flange 2, and the bottom surface 31 and the top surface 32 are parallel to each other;

[0035] Figure 3 Meanwhile, a first gap 14 is formed between the outer surface of the sealing member 3 and the inner surface of the first groove 13, and a first gasket 15 connected with the inner surface of the first groove 13 and the outer surface of the sealing member 3 is arranged in the first gap 14; a second gap 23 is formed between the outer surface of the sealing member 3 and the inner surface of the second groove 22, and a second gasket 24 connected with the inner surface of the second groove 22 is arranged in the second gap 23;

[0036] In the embodiment, the first gasket 15 and the second gasket 24 can be multiple, and one or both of the first gasket 15 and the second gasket 24 is made of soft metal, so that when the first gasket 15 and the second gasket 24 are squeezed, they can be deformed under pressure to fill the small gap between the components, adapt to the position change of the components caused by the assembly precision error, and at the same time, the second gasket 24 can also block the channel of the internal gas in the internal cavity 21 flowing to the radial fitting gap S2, so as to enhance the sealing effect.

[0037] Embodiment 4:

[0038] The difference between the embodiment and the embodiment 1 is that, as shown in the figure, the sealing member 3 is a prism or circular prism structure as a whole, which has a bottom surface 31 in contact with the outer circumferential surface of the axial extension 12, and a top surface 32 for closing the radial fitting gap S2 formed by the cooperation of the lower end surface of the radial extension 11 and the upper end surface of the second sealing flange 2, and the bottom surface 31 and the top surface 32 are parallel to each other;

[0039] ​The embodiment provides a Stirling cryogenic machine, which comprises the flange sealing structure described in any one of embodiments 1 to 3.

[0040] In summary, the utility model discloses a sealing piece is sealed between the axial cooperation gap between the axial extension and the second sealing flange, to ensure that the gas in the internal cavity cannot flow out through the axial cooperation gap, fundamentally solve the problem of internal gas leakage, to achieve the desired sealing effect, at the same time, the radial cooperation gap of the top surface of the sealing piece of the prism or circular cone structure is also closed, to further enhance the sealing effect.

[0041] In addition, the gasket made of soft metal is arranged in the first groove and the second groove, which can be deformed under pressure to adapt to the position change of the components caused by assembly precision error, and the sealing effect is enhanced.

[0042] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A seal structure for a Stirling cryocooler, characterised in that, The flange sealing structure comprises: a first sealing flange having a radial extension and an axial extension, and a first groove is formed at the intersection of the radial extension and the axial extension; a second sealing flange matched with the first sealing flange, and a second groove is formed at a position corresponding to the first groove; and a sealing element accommodated in a receiving space formed by the first groove, the second groove and the outer circumferential surface of the axial extension, so as to close an axial matching gap between the axial extension and the second sealing flange.

2. The seal structure of claim 1, wherein An inner cavity is formed in the second sealing flange and matched with the axial extension.

3. The seal structure of claim 1, wherein The surface of the sealing element towards the outer circumferential surface of the axial extension is in contact with the outer circumferential surface of the axial extension.

4. The seal structure of claim 1, wherein The sealing element is in the structure of a prism or a circular prism, and has a bottom surface in contact with the outer circumferential surface of the axial extension, and a top surface for matching with the radial extension and the second sealing flange to form a radial matching gap.

5. The seal structure of claim 4, wherein The top surface closes the radial matching gap formed by the radial extension and the second sealing flange.

6. The seal structure of claim 1, wherein A first gap is formed between the outer surface of the sealing element and the inner surface of the first groove, and a first gasket is arranged in the first gap and connected with the inner surface of the first groove and the outer surface of the sealing element respectively.

7. The seal structure of claim 6, wherein The first gasket is made of soft metal.

8. The seal structure of claim 1, wherein A second gap is formed between the outer surface of the sealing element and the inner surface of the second groove, and a second gasket is arranged in the second gap and connected with the inner surface of the second groove.

9. The seal structure of claim 8, wherein The second gasket is made of soft metal.

10. A Stirling cryocooler characterised in that, The flange sealing structure comprises the flange sealing structure according to any one of claims 1-9.

Images