Sealing structure for Stirling cryocooler and Stirling cryocooler

Abstract

The utility model discloses a sealing structure for a Stirling cryocooler. The sealing structure comprises a machine body and a sealing piece. An inflation hole, a sealing hole and a connecting hole are formed in the machine body, the sealing hole communicates with the inflation hole, and the connecting hole communicates with the end, away from the inflation hole, of the sealing hole; the sealing element is detachably connected to the connecting hole, and one end of the sealing element can extend into the sealing hole and is in sealing contact with the inner wall of the sealing hole so as to separate the inflating hole from the connecting hole. By the adoption of the sealing structure, when air is inflated through the air inflation hole, the sealing piece is detached; when the inflation hole needs to be sealed, the sealing piece is connected to the connecting hole, one end of the sealing piece can stretch into the sealing hole and make sealing contact with the inner wall of the sealing hole, the inflation hole and the connecting hole are separated, and sealing of the inflation hole is achieved. Compared with an existing packing mode for sealing, due to the fact that the sealing piece is integrally arranged, adhesion between the sealing piece and the machine body is avoided, and the inflation hole is prevented from being blocked. The utility model further discloses the Stirling cryocooler.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mechanical sealing structure, and particularly relates to a sealing structure for a Stirling cryocooler and the Stirling cryocooler. BACKGROUND

[0002] The Stirling cycle is composed of two isothermal processes and two constant-volume regenerative processes, and its working principle is to exchange and convert heat in the compression and expansion processes of gas. The Stirling cryocooler is a refrigeration device based on the Stirling cycle, and through the collaborative work of reasonably designed compressor, cooler, regenerator and expander and other components, it exhibits high potential in realizing low-temperature refrigeration.

[0003] With the wide application of the Stirling cryocooler in the fields of aviation, medical treatment and exploration, the reliability requirement of the Stirling cryocooler is also increasing. The sealing property of the working gas in the Stirling cryocooler is crucial to the cryocooler. At present, the charging hole of the Stirling cryocooler is usually sealed by using the packing sealing mode, and the packing is prone to be adhered to the body after being sealed, and is not easy to handle. CONTENT OF THE INVENTION

[0004] The technical problem to be solved by the application is that the packing is adhered to the body after being sealed by the current packing sealing mode, and is not easy to handle. In order to solve the technical problem, the application provides a sealing structure for a Stirling cryocooler, which can seal the charging hole and will not be adhered to the body.

[0005] The technical scheme provided by the application is as follows:

[0006] A sealing structure for a Stirling cryocooler, comprising:

[0007] A body provided with a charging hole, a sealing hole and a connecting hole, the sealing hole being in communication with the charging hole, and the connecting hole being in communication with one end of the sealing hole away from the charging hole;

[0008] A sealing element detachably connected to the connecting hole, and one end of the sealing element being capable of extending into the sealing hole and being in sealing contact with the inner wall of the sealing hole to block the charging hole and the connecting hole.

[0009] The sealing structure is used to detach the sealing element when charging through the charging hole, and the sealing element is connected to the connecting hole when the charging hole needs to be sealed. One end of the sealing element can extend into the sealing hole and be in sealing contact with the inner wall of the sealing hole, and the charging hole and the connecting hole are blocked, so that the sealing of the charging hole is realized. Compared with the existing packing sealing mode, the sealing element is integrally arranged and will not be adhered to the body, so that the charging hole is prevented from being blocked.

[0010] Further, the sealing member comprises a connecting section and a sealing section, the connecting section is detachably connected with the connecting hole, and the sealing section is capable of extending into the sealing hole and sealingly contacting with the inner wall of the sealing hole.

[0011] Further, the connecting section is threadedly connected with the connecting hole.

[0012] Further, the sealing member further comprises an intermediate section, and the connecting section and the sealing section are respectively connected with opposite ends of the intermediate section.

[0013] Further, the diameter of the connecting hole is larger than the diameter of the sealing hole, and one end of the intermediate section connected with the sealing section sealingly contacts with the bottom wall of the connecting hole.

[0014] Further, the radial dimension of the intermediate section is smaller than the diameter of the connecting hole.

[0015] Further, the sealing hole comprises a tapered section, one end of the tapered section away from the connecting hole is communicated with the inflation hole, and the diameter of the tapered section gradually increases from the end communicated with the inflation hole to the end communicated with the connecting hole.

[0016] The end of the sealing member extending into the sealing hole comprises a tapered part, the tapered part is matched with the tapered section to sealingly contact with the inner wall of the tapered section.

[0017] Further, the sealing hole further comprises a cylindrical section, two ends of the cylindrical section are respectively communicated with the tapered section and the connecting hole.

[0018] The end of the sealing member extending into the sealing hole further comprises a cylindrical part connected with the tapered part, and the cylindrical part is capable of sealingly contacting with the inner wall of the cylindrical section.

[0019] Further, the material of the sealing member is hard metal.

[0020] A Stirling cryogenic machine comprises the sealing structure for Stirling cryogenic machine as described above. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the embodiments of the present application and explain the present application together with the embodiments of the present application, but do not limit the present application.

[0022] Figure 1 The structural schematic diagram of the sealing structure provided by an embodiment of the present application is shown in the figure;

[0023] Figure 2 The structural schematic diagram of the sealing structure provided by an embodiment of the present application is shown in the figure; Figure 1 The structural schematic diagram of the sealing structure provided by an embodiment of the present application is shown in the figure;

[0024] Label Description:

[0025] 100, body; 110, charging hole; 120, sealing hole; 121, conical section; 122, cylindrical section; 130, connecting hole; 200, sealing member; 210, connecting section; 220, sealing section; 221, conical part; 222, cylindrical part; 230, intermediate section. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0028] In one aspect, as shown in Figure 1 and Figure 2 An embodiment of the present application provides a sealing structure for a Stirling refrigerator, which comprises a body 100 and a sealing member 200. The body 100 is a part of the Stirling refrigerator. The body 100 is provided with a charging hole 110, a sealing hole 120 and a connecting hole 130. The sealing hole 120 communicates with the charging hole 110. The connecting hole 130 communicates with one end of the sealing hole 120 away from the charging hole 110.

[0029] The sealing member 200 is detachably connected to the connecting hole 130. One end of the sealing member 200 can extend into the sealing hole 120 and be in sealing contact with the inner wall of the sealing hole 120, so as to cut off the charging hole 110 and the connecting hole 130, thereby achieving sealing of the charging hole 110.

[0030] The sealing structure is used to detach the sealing member 200 when inflating through the inflation hole 110, and connect the sealing member 200 to the connecting hole 130 when sealing the inflation hole 110, so that one end of the sealing member 200 can extend into the sealing hole 120 and be in sealing contact with the inner wall of the sealing hole 120, and the inflation hole 110 and the connecting hole 130 are separated, thereby achieving the sealing of the inflation hole 110. Compared with the existing filler sealing method, the sealing member 200 is integrally arranged and does not adhere to the machine body 100, thereby avoiding the blockage of the inflation hole 110.

[0031] Preferably, the sealing member 200 is made of a hard metal. In this way, the sealing member 200 is not easy to deform, and the sealing property of the inflation hole 110 can be ensured in the long-term use, thereby improving the reliability of the sealing structure.

[0032] In one embodiment, the sealing member 200 includes a connecting segment 210 and a sealing segment 220 connected to each other, the connecting segment 210 is detachably connected to the connecting hole 130, and the sealing segment 220 can extend into the sealing hole 120 and be in sealing contact with the inner wall of the sealing hole 120, thereby separating the inflation hole 110 and the connecting hole 130 and sealing the inflation hole 110. Preferably, the connecting segment 210 is threadedly connected to the connecting hole 130, so as to facilitate the disassembly and assembly of the sealing member 200 and improve the operation efficiency. Meanwhile, the threaded connection can also seal the connecting segment 210 and the connecting hole 130, thereby separating the sealing hole 120 from the outside and further improving the sealing property.

[0033] Further, the sealing member 200 further includes an intermediate segment 230, and the connecting segment 210 and the sealing segment 220 are respectively connected to opposite ends of the intermediate segment 230. Further, the radial dimension of the intermediate segment 230 is smaller than the hole diameter of the connecting hole 130, so as to form a buffer space between the intermediate segment 230 and the inner wall of the connecting hole 130, thereby buffering the leaked gas and further improving the sealing property and slowing down the gas leakage rate.

[0034] In one embodiment, the hole diameter of the connecting hole 130 is larger than the hole diameter of the sealing hole 120, and one end of the intermediate segment 230 connected to the sealing segment 220 is in sealing contact with the bottom wall of the connecting hole 130, thereby further improving the sealing property.

[0035] In one embodiment, the sealing hole 120 includes a tapered segment 121 and a cylindrical segment 122, one end of the tapered segment 121 away from the cylindrical segment 122 is in communication with the inflation hole 110, and the hole diameter of the tapered hole gradually increases from the one end in communication with the inflation hole 110 to the one end in communication with the cylindrical segment 122. Meanwhile, the end of the sealing member 200 extending into the sealing hole 120 can be in sealing contact with the inner wall of the tapered segment 121 and the cylindrical segment 122.

[0036] It needs to be explained that if the sealing hole 120 is cylindrical, the end of the sealing element 200 extending into the sealing hole 120 is also cylindrical, in order to realize the extension of the sealing element 200, there may be a gap between the sealing element 200 and the inner wall of the sealing hole 120, thereby affecting the sealing performance; by setting the tapered section 121, the contact area between the sealing element 200 and the inner wall of the sealing hole 120 can be increased, and the sealing performance can be improved.

[0037] In one embodiment, the end of the sealing element 200 extending into the sealing hole 120 includes a tapered portion 221 and a cylindrical portion 222 connected to each other, as known from the above embodiment, the sealing section 220 includes the tapered portion 221 and the cylindrical portion 222 connected to each other, and the cylindrical portion 222 is connected to the intermediate section 230, and the tapered portion 221 is located at the end of the cylindrical portion 222 away from the intermediate section 230. The tapered portion 221 matches the tapered section 121 to be in sealing contact with the inner wall of the tapered section 121; the cylindrical portion 222 matches the cylindrical section 122 to be in sealing contact with the inner wall of the cylindrical section 122.

[0038] On the other hand, the application also provides a Stirling cryogenic machine, which includes the sealing structure for the Stirling cryogenic machine in the above embodiments.

[0039] It needs to be explained that the sealing structure described above realizes the sealing of the inflation hole 110, which means that the gas leakage rate at the inflation hole 110 meets the requirements. For example, the sealing structure described above can be applied to high temperature of 100℃ and low temperature of 55℃, and the helium leakage rate is 7.6x10 -10 pa / m 3 .

[0040] Although the embodiments of the application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the application, and the scope of the application is defined by the appended claims and their equivalents.

Claims

1. A seal structure for a Stirling cryocooler, characterized by, The application relates to a sealing structure for a Stirling refrigerating machine. The sealing structure comprises a body provided with an inflation hole, a sealing hole and a connecting hole, the sealing hole is communicated with the inflation hole, and the connecting hole is communicated with one end of the sealing hole far from the inflation hole. A sealing member is detachably connected to the connecting hole, and one end of the sealing member can be inserted into the sealing hole and in sealing contact with the inner wall of the sealing hole to cut off the inflation hole and the connecting hole.

2. A seal structure for a Stirling cryocooler according to claim 1, characterized by, The sealing member comprises a connecting section and a sealing section connected to each other, the connecting section is detachably connected to the connecting hole, and the sealing section can be inserted into the sealing hole and in sealing contact with the inner wall of the sealing hole.

3. A seal structure for a Stirling cryocooler according to claim 2, characterised in that, The connecting section is threadedly connected to the connecting hole.

4. The seal structure for a Stirling cryocooler according to claim 2, characterized by, The sealing member further comprises an intermediate section, and the connecting section and the sealing section are respectively connected to opposite ends of the intermediate section.

5. A seal structure for a Stirling cryocooler according to claim 4, characterised in that, The diameter of the connecting hole is larger than that of the sealing hole, and one end of the intermediate section connected to the sealing section is in sealing contact with the bottom wall of the connecting hole.

6. A seal structure for a Stirling cryocooler according to claim 4, characterized by, The radial dimension of the intermediate section is smaller than the diameter of the connecting hole.

7. The seal structure for a Stirling cryocooler according to claim 1, characterized by, The sealing hole comprises a tapered section, one end of the tapered section far from the connecting hole is communicated with the inflation hole, and the diameter of the tapered section gradually increases from the end communicated with the inflation hole to the end communicated with the connecting hole. The end of the sealing member inserted into the sealing hole comprises a tapered part matched with the tapered section to be in sealing contact with the inner wall of the tapered section.

8. A seal structure for a Stirling cryocooler according to claim 7, characterised in that, The sealing hole further comprises a cylindrical section, and two ends of the cylindrical section are respectively communicated with the tapered section and the connecting hole. The end of the sealing member inserted into the sealing hole further comprises a cylindrical part connected to the tapered part, and the cylindrical part can be in sealing contact with the inner wall of the cylindrical section.

9. The seal structure for a Stirling cryocooler according to claim 1, characterized by, The material of the sealing member is hard metal.

10. A Stirling cryocooler characterised in that, The application further discloses a sealing structure for a Stirling refrigerating machine.

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