Rotating shaft mounting structure of Stirling cryocooler and Stirling cryocooler

Abstract

The utility model relates to a Stirling cryocooler rotating shaft installation structure and a Stirling cryocooler, and the Stirling cryocooler rotating shaft installation structure comprises a base which is provided with a base internal installation space; the boss is provided with a boss internal mounting space; the base and the boss are of an integrally-formed structure, and the boss is connected with the upper surface of the base and the inner mounting space of the base and the inner mounting space of the boss to be communicated with each other. A rotating shaft of the Stirling cryocooler is located in the base inner installation space and the boss inner installation space, and the upper end and the lower end of the rotating shaft are correspondingly contained in the top of the boss inner installation space and the bottom of the base inner installation space respectively. The coaxial installation precision of the rotating shaft can be guaranteed through the integrated structural design, deflection of the rotating shaft is avoided, meanwhile, the length of the rotating shaft can be shortened, and the size and weight of equipment are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of stirling cryocooler, especially a kind of stirling cryocooler's rotating shaft mounting structure and stirling cryocooler. BACKGROUND

[0002] Stirling cryocooler is widely used in infrared refrigeration detector and other fields with its compact structure, small volume, light weight and other characteristics, which mainly drives each kinematic pair to move by the rotation of internal rotating shaft to realize the refrigeration function of cryocooler.

[0003] The existing rotating stirling cryocooler body is mostly upper and lower split structure, that is, the upper shell and the base are assembled through flange and other structures, and each bearing chamber is provided in the upper shell and the base for installing bearing, and the upper end and the lower end of rotating shaft are matched with the bearings in the two bearing chambers respectively to complete the assembly of rotating shaft.

[0004] In the above rotating shaft assembly process, the two bearing chambers, bearings and rotating shaft are required to be coaxial, but in fact, due to the problems of assembly accuracy, structure machining error and other problems in the assembly process, the two bearing chambers are difficult to be coaxial, so that the rotating shaft installed in the center of bearing is inclined, which leads to poor stability when each kinematic pair is moved under the driving action of rotating shaft, and problems such as shortening the service life of stirling cryocooler occur. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of stirling cryocooler's rotating shaft mounting structure and stirling cryocooler, which can ensure the coaxial installation accuracy of rotating shaft through integrated structure design, avoid the inclination of rotating shaft, shorten the length of rotating shaft, and reduce the volume and weight of equipment.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] On the one hand, a kind of stirling cryocooler's rotating shaft mounting structure is provided, which comprises:

[0008] The base has a base internal mounting space;

[0009] The boss has a boss internal mounting space;

[0010] The base and the boss are integrally formed, and the boss is connected to the upper surface of the base, and the base internal mounting space and the boss internal mounting space are in communication with each other;

[0011] The rotating shaft of the Stirling cryocooler is located in the inner mounting space of the base and the inner mounting space of the boss, and the upper end and the lower end of the rotating shaft correspond to the top of the inner mounting space of the boss and the bottom of the inner mounting space of the base respectively.

[0012] Preferably, the top of the inner mounting space of the boss has a boss bearing chamber, and the bottom of the inner mounting space of the base has a base bearing chamber, and the boss bearing chamber and the base bearing chamber are respectively used for corresponding installation of the upper bearing and the lower bearing, and the upper end and the lower end of the rotating shaft correspond to the upper bearing and the lower bearing respectively.

[0013] Preferably, the end of the base away from the boss has a notch in communication with the base bearing chamber, and the rotating shaft mounting structure further comprises a base cover plate located in the notch and connected to the base to close the notch.

[0014] Preferably, the diameter of the notch is not less than the diameter of the base bearing chamber.

[0015] In another aspect, a Stirling cryocooler is also provided, which comprises a rotating shaft, a housing, a stator assembly, a rotor assembly, a compression assembly, preferably an expansion assembly, and the rotating shaft mounting structure described above;

[0016] The housing is sleeved on the periphery of the boss and connected to the base.

[0017] The rotor assembly is connected to the outer wall surface of the rotating shaft and located in the inner mounting space of the boss, and the stator assembly is connected to the inner wall surface of the housing.

[0018] The rotating shaft is an eccentric rotating shaft with an eccentric structure, which connects the compression assembly and the expansion assembly through the eccentric structure, and the eccentric structure is located in the inner mounting space of the base.

[0019] Preferably, the Stirling cryocooler further comprises a gland cover, which is sleeved on the boss and connected to the housing.

[0020] Preferably, a gland cover through hole is formed on the gland cover, and the top of the boss is provided with a mounting piece; a fastener passes through the gland cover through hole and is connected to the mounting piece.

[0021] Preferably, a compression assembly mounting cavity for mounting the compression assembly is formed on the base, and the compression assembly mounting cavity is in communication with the inner mounting space of the base.

[0022] Preferably, the compression assembly mounting cavity penetrates through the base, and the base is connected with a compression end cover for closing the compression assembly mounting cavity.

[0023] Preferably, the base is further provided with an expander assembly mounting cavity communicating with the internal mounting space of the base. The expander assembly includes a pushing module and a cold storage module. The pushing module is installed in the expander assembly mounting cavity, and the cold storage module is connected to the pushing module.

[0024] In summary, the present invention has the following advantages compared with the prior art:

[0025] The rotating shaft mounting structure of this utility model is an integrated design, with the rotating shaft entirely housed within this integrated structure. This eliminates the need to assemble different components to achieve the mounting structure, thus completely avoiding misalignment of the upper and lower bearing chambers due to assembly errors. Furthermore, it allows for easier process control to ensure higher coaxiality between the boss bearing chamber and the base bearing chamber, further guaranteeing the coaxial mounting accuracy of the rotating shaft and preventing or reducing problems such as unstable component operation and reduced operational reliability caused by rotating shaft misalignment. Simultaneously, since the upper and lower ends of the rotating shaft are respectively housed within the boss bearing chamber and base bearing chamber of the integrated structure, without needing to extend into other components outside the integrated structure, the overall length of the rotating shaft can be reduced. Attached Figure Description

[0026] Fig. 1 This is an overall structural diagram of the rotating shaft mounting structure of this utility model.

[0027] Fig. 2 This is a cross-sectional view of the rotating shaft mounting structure of this utility model.

[0028] Fig. 3 This is a cross-sectional view of the Stirling refrigeration unit in this utility model. Detailed Implementation

[0029] 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.

[0030] Example 1

[0031] like Figs. 1-3 As shown, this embodiment provides a shaft mounting structure for a Stirling refrigerator, which includes:

[0032] The base 1 has an internal mounting space 11, and the bottom of the internal mounting space 11 is a base bearing chamber 12;

[0033] a boss 2 having a boss inner mounting space 21, and a top of the boss inner mounting space 21 is a boss bearing chamber 22;

[0034] The base 1 and the boss 2 are an integral structure, the boss 2 is connected to an upper surface of the base 1, and a base inner mounting space 11 and the boss inner mounting space 21 are in communication with each other;

[0035] The boss bearing chamber 22 and the base bearing chamber 12 are respectively used for corresponding installation of an upper bearing 100 and a lower bearing 200, a rotating shaft 300 of a Stirling refrigerator is accommodated in a space formed by the base inner mounting space 11 and the boss inner mounting space 21, and upper and lower ends of the rotating shaft 300 are respectively matched with the upper bearing 100 and the lower bearing 200, so that the upper and lower ends of the rotating shaft 300 are respectively accommodated in the boss bearing chamber 22 and the base bearing chamber 12;

[0036] The boss bearing chamber 22, the base bearing chamber 12, the upper bearing 100, the lower bearing 200, and the rotating shaft 300 are coaxially arranged.

[0037] Therefore, in the embodiment, the rotating shaft 300 is arranged in the integral structure formed by the base 1 and the boss 2 as a whole, and the installation structure of the rotating shaft 300 does not need to be obtained by assembling different components, such as assembling the upper housing and the base through a flange in the prior art, so that the misalignment of the upper and lower bearing chambers can be completely avoided, and when the integral structure is manufactured, the boss bearing chamber 22 and the base bearing chamber 12 can have higher coaxiality through process control, so as to further ensure the installation accuracy of the rotating shaft 300 and avoid problems such as unstable operation of components, reduced operation reliability (such as component failure) caused by deflection of the rotating shaft 300.

[0038] Meanwhile, since the upper and lower ends of the rotating shaft 300 are respectively accommodated in the boss bearing chamber 22 and the base bearing chamber 12 of the integral structure, other components outside the integral structure are not needed to be extended into, so that the overall length of the rotating shaft 300 can be reduced, and the volume and weight of the equipment as a whole are further reduced.

[0039] Embodiment 2:

[0040] The difference between the embodiment and the embodiment 1 is that, as shown in Figs. 1-3 The rotating shaft mounting structure further includes:

[0041] A mounting piece 3 connected to a top of the boss 2, used for connecting the rotating shaft mounting structure as a whole to other components;

[0042] and a base cover plate connected to the base 1, used for closing a bottom of the base bearing chamber 12.

[0043] For example, in this embodiment, a threaded hole 31 is formed in the mounting member 3 along the axial direction, and a fastener such as a bolt can be screwed into the threaded hole 31 after passing through other components, thereby achieving connection and installation between different structures. Meanwhile, a notch 13 is formed in the base 1 away from the end of the boss 2, and the base cover plate is located in the notch 13 and connected to the base 1, thereby achieving sealing of the bottom of the base bearing chamber 12 and preventing dust and other foreign matter from entering the interior and affecting the operation of the components, and preventing leakage of the internal gas working medium.

[0044] The diameter of the notch 13 is not less than the diameter of the base bearing chamber 12. When installing the rotating shaft, the upper bearing 100 is first installed in the boss bearing chamber 22, then the upper end of the rotating shaft 300 is inserted into the boss bearing chamber 22 through the notch 13, and the rotating shaft 300 is inserted into the space formed by the internal mounting space 11 of the base, the base bearing chamber 12, the internal mounting space 21 of the boss, and the boss bearing chamber 22, and then the upper end of the rotating shaft 300 is matched with the upper bearing 100. Then the lower bearing 200 is installed in the base bearing chamber 12, and the lower end of the rotating shaft 300 is pressed into the lower bearing 200. Finally, the notch 13 is closed by the base cover plate.

[0045] Further, the mounting member 3 and the boss 2 can also be integrally formed, and the outer diameter of the mounting member 3 is less than the outer diameter of the boss 2. Therefore, the base 1, the boss 2, and the mounting member 3 can be integrally machined from the same material, such as metal.

[0046] Embodiment 3:

[0047] The present embodiment provides a Stirling refrigerator, as shown in the figure, which comprises a rotating shaft 300, a housing 400, a rotating shaft mounting structure according to embodiments 1 or 2, a stator assembly 500, a rotor assembly 600, a compression assembly, and an expander assembly. Fig. 3

[0048] The housing 400 is sleeved around the mounting member 3 and the boss 2, and the lower end surface of the housing 400 abuts against the upper end surface of the base 1, and the housing 400 and the base 1 are connected by a flange or other structure.

[0049] The rotor assembly 600 is connected to the outer wall surface of the rotating shaft 300 by adhesion or other means, and rotates synchronously with the rotating shaft 300. The stator assembly 500 is connected to the inner wall surface of the housing 400 by adhesion or other means.

[0050] ​The gland 700 is covered on the boss 2 by a structure such as a compression ring, and is connected with the shell 400, for enclosing the mounting piece 3 and the boss 2 inside the shell 400; preferably, a through hole 701 of the gland 700 is arranged corresponding to the position of the mounting piece 3, so that the fastener can be screwed with the threaded hole 31 of the mounting piece 3 through the through hole 701 of the gland, to realize the connection between the gland 700 and the mounting piece 3.

[0051] The rotating shaft 300 is an eccentric rotating shaft with an eccentric structure, which connects the compression assembly and the expansion assembly through the eccentric structure, and the eccentric structure is arranged in the internal mounting space 11 of the base;

[0052] Meanwhile, the base 1 is provided with a compression assembly mounting cavity 14 for mounting the compression assembly, the central axis of the compression assembly mounting cavity 14 is perpendicular to the central axis of the rotating shaft 300, and the compression assembly mounting cavity 14 is in communication with the internal mounting space 11 of the base; further, the compression assembly mounting cavity 14 is arranged through the base 1, and the base 1 is connected with a compression end cover 15 for enclosing the compression assembly mounting cavity 14.

[0053] Further, the expansion machine assembly comprises a push module and a cold accumulator module connected with the push module, and the base 1 is further provided with an expansion machine assembly mounting cavity 16 in communication with the internal mounting space 11 of the base, and the push module is arranged in the expansion machine assembly mounting cavity 16.

[0054] The stator assembly 500 and the rotor assembly 600 constitute a motor system to drive the rotating shaft 300 to rotate, and further convert the rotary motion of the rotating shaft 300 into reciprocating motion of the compression assembly and the expansion machine assembly, so as to compress the gas working medium (such as helium) in the compression cavity, so that the high-pressure gas working medium releases heat at the hot end during compression and absorbs heat at the cold end during expansion, to achieve the refrigeration effect; the structure design and working principle of the compression assembly and the expansion machine assembly are both prior art, and will not be described in detail.

[0055] In summary, the rotating shaft mounting structure in the utility model is designed as an integrated structure, which is simple and compact in overall structure, and the rotating shaft is arranged in the integrated structure, so that the rotating shaft mounting structure is obtained without assembling different components, thus the misalignment of the upper and lower bearing chambers can be completely avoided, and the boss bearing chamber and the base bearing chamber can be easily controlled to have higher coaxiality, so as to further ensure the coaxial mounting precision of the rotating shaft, and avoid or reduce the problems of unstable operation of components, reduced operation reliability (such as component failure) and the like caused by the deflection of the rotating shaft.

[0056] Meanwhile, as the upper and lower ends of the rotating shaft are respectively accommodated in the boss bearing chamber and the base bearing chamber of the integrated structure, no other components need to extend outside the integrated structure, thus the overall length of the rotating shaft can be reduced, and the volume and weight of the equipment as a whole are further reduced.

[0057] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A shaft mounting structure for a Stirling refrigerator, characterized in that, The application relates to a rotating shaft mounting structure of a Stirling refrigerator. The rotating shaft mounting structure comprises a base and a boss. The base and the boss are integrally formed, and the boss is connected to the upper surface of the base. The rotating shaft is located in the base inner mounting space and the boss inner mounting space, and the upper end and the lower end of the rotating shaft are respectively accommodated in the top of the boss inner mounting space and the bottom of the base inner mounting space. The top of the boss inner mounting space is provided with a boss bearing chamber, and the bottom of the base inner mounting space is provided with a base bearing chamber.

2. The pivot mounting structure according to claim 1, wherein The base is provided with a slot at the end away from the boss, and the slot is connected to the base bearing chamber.

3. The pivot mounting structure according to claim 2, wherein The diameter of the slot is not less than the diameter of the base bearing chamber.

4. The pivot mounting structure according to claim 3, wherein: The Stirling refrigerator further comprises the rotating shaft mounting structure according to any one of claims 1-4.

5. A Stirling cryocooler comprising a rotating shaft, a housing, a stator assembly, a rotor assembly, a compression assembly and an expansion assembly, characterised in that, The shell is sleeved on the periphery of the boss and connected to the base. The rotor assembly is connected to the outer wall surface of the rotating shaft and located in the boss inner mounting space. The stator assembly is connected to the inner wall surface of the shell. The rotating shaft is an eccentric rotating shaft with an eccentric structure.

6. A Stirling cryocooler as claimed in claim 5, characterised in that, The Stirling refrigerator further comprises a gland cover.

7. A Stirling cryocooler as claimed in claim 6, characterised in that, The gland cover is provided on the boss and connected to the shell.

8. A Stirling cryocooler as claimed in claim 6, characterised in that, The Stirling refrigerator further comprises a compression assembly mounting cavity.

9. A Stirling cryocooler as claimed in claim 8, characterised in that, The Stirling refrigerator further comprises a compression end cover.

10. A Stirling cryocooler as claimed in claim 8, characterised in that, The Stirling refrigerator further comprises an expander assembly mounting cavity. The expander assembly comprises a push module and a regenerator module.

Images