CN218936703U

CN218936703U - Rotary Stirling refrigerator

Info

Publication number: CN218936703U
Application number: CN202223039140.9U
Authority: CN
Inventors: 黄晟; 黄立; 曹永刚; 刘斌; 郭亚军; 王洪兵; 孙建; 张晓�
Original assignee: Wuhan Gaoxin Technology Co Ltd
Current assignee: Wuhan Gaoxin Technology Co Ltd
Priority date: 2022-11-15
Filing date: 2022-11-15
Publication date: 2023-04-28
Anticipated expiration: 2032-11-15

Abstract

The utility model relates to a rotary Stirling refrigerator, which comprises a machine case and a rotating shaft, wherein two groups of bearing seats are arranged in the machine case, two ends of the rotating shaft are respectively arranged on the two groups of bearing seats, and at least one group of bearing seats is a floating bearing seat; the chassis is internally provided with a guide seat in a matching way, the floating bearing seat is movably arranged on the guide seat, the moving direction of the floating bearing seat is parallel to the axial direction of the rotating shaft, and the floating bearing seat is provided with an axial buffer structure. The utility model configures the bearing seat for the rotating shaft and designs the bearing seat as a floating bearing seat, allows the bearing seat and the rotating shaft to generate axial displacement within a certain range, avoids the situation of shafting movement unbalance caused by overlarge rigidity of a rotating shaft mounting structure, and well avoids abnormal situations of a refrigerator such as noise, jiao Wen fluctuation, current fluctuation and the like; the floating bearing seat is provided with the axial buffer structure, so that the floating bearing seat can play a role in buffering and better protect related parts such as a rotating shaft and the like.

Description

Rotary Stirling refrigerator

Technical Field

The utility model relates to a rotary Stirling refrigerator.

Background

Infrared detectors are a core component of infrared technology and are also leading developments in infrared technology. The infrared detector has very wide application in civil and military fields such as missile guidance, aerospace detection, early warning satellite, reconnaissance and the like. The refrigerator is an important component of the refrigeration type infrared detector, is a core of a moving part, and the stability and balance of shafting movement are one of important characteristics of long-service-life operation of the refrigerator.

The shafting of the rotary Stirling refrigerator is connected with the compression part and the pushing part of the refrigerator, helium working medium in the refrigerator is subjected to compression and expansion processes in the whole refrigeration cycle, and the movement conditions of the compression piston and the pushing piston directly determine the refrigeration performance and long-term reliability of the refrigerator. The shafting motion balance of the conventional Stirling refrigerator is regulated by the axial gap of a bearing and the rigidity of a wave spring, wherein the bearing is generally adopted at the bottom and the middle of a rotating shaft, the wave spring is generally adopted at the upper part of the rotating shaft, the bearing is generally a deep groove ball bearing, and the wave spring adopts a single-piece or multi-piece structure; the axial clearance of the deep groove ball bearing is small, the service life of the bearing can be directly influenced once the axial clearance exceeds the preset clearance of the bearing, the load can be increased due to continuous operation, and abnormal conditions such as motion retardation, noise, current fluctuation and the like can be further caused, so that the performance of the detector is directly influenced; the wave spring has small precision, large tolerance range of height and rigidity, no axial fixation, no precise assembly, and certain influence on the stability of the shaft system.

Disclosure of Invention

The utility model relates to a rotary Stirling refrigerator, which can at least solve part of defects in the prior art.

The utility model relates to a rotary Stirling refrigerator, which comprises a machine case and a rotating shaft, wherein two groups of bearing seats are arranged in the machine case, two ends of the rotating shaft are respectively arranged on the two groups of bearing seats, and at least one group of bearing seats is a floating bearing seat; the floating bearing seat is movably arranged on the guide seat, the moving direction of the floating bearing seat is parallel to the axial direction of the rotating shaft, and the floating bearing seat is provided with an axial buffer structure.

As one embodiment, the axial buffer structure comprises a plate spring, and the plate spring is connected with the corresponding guide seat.

As one of implementation modes, the plate spring is an annular plate spring, an inner ring of the plate spring is fixedly connected with the floating bearing seat coaxially, and an outer ring of the plate spring is fixedly connected with the corresponding guide seat.

As one of the implementation modes, the inner ring of the plate spring is connected with the floating bearing seat through a plurality of first threaded fasteners, and the first threaded fasteners are uniformly distributed at intervals along the circumferential direction of the plate spring; and/or the outer ring of the plate spring is connected with the guide seat through a plurality of second threaded fasteners, and the second threaded fasteners are uniformly distributed at intervals along the circumferential direction of the plate spring.

As one embodiment, the plate surface of the plate spring is perpendicular to the axial direction of the rotating shaft.

As one of implementation modes, a guide groove is formed in the guide seat, and the floating bearing seat is movably arranged in the corresponding guide groove and is in clearance fit with the groove wall of the guide groove.

As one embodiment, the plate spring is connected around the notch of the corresponding guide groove.

As one of implementation modes, a cushion block is clamped at the joint between the plate spring and the guide seat.

As one of the implementation modes, a guide groove is formed in the guide seat, and the floating bearing seat is movably arranged in the corresponding guide groove and is in clearance fit with the groove wall of the guide groove; the guide groove is a stepped groove, and the peripheral side wall of the floating bearing seat is correspondingly stepped.

As one of the implementation modes, the case comprises a main case and a driving case, the main case is in flange assembly with the driving case, one end of the rotating shaft is positioned in the driving case and connected with a power unit in the driving case, and the other end of the rotating shaft is positioned in the main case and connected with a transmission structure in the main case.

The utility model has at least the following beneficial effects:

according to the Stirling refrigerator provided by the utility model, the bearing seat is configured for the rotating shaft and is designed as the floating bearing seat, so that the bearing seat and the rotating shaft are allowed to generate axial displacement within a certain range, the situation that shafting movement is unbalanced due to overlarge rigidity of a rotating shaft mounting structure is avoided, and abnormal refrigerator situations such as noise, jiao Wen fluctuation and current fluctuation are well avoided; the bearing seat receives the bearing, maintains the circumferential rotary motion of the bearing, can effectively maintain the working stability of the rotating shaft and the bearing, and prolongs the service life of parts.

The floating bearing seat is provided with an axial buffer structure, so that the floating bearing seat can play a role in buffering and can better protect related parts such as a rotating shaft and the like; when the plate spring is adopted to connect the floating bearing seat and the guide seat, the plate spring can play a role in buffering, can well restrain the floating bearing seat, and improves the working reliability and stability of a shafting, thereby improving the working reliability and the refrigeration precision of the refrigerator; the leaf spring has the characteristic of precise machining, can ensure the precision of parameters such as size, rigidity and the like, realizes precise assembly, and can remarkably improve the stability of shafting movement; under the constraint action of the guide seat on the floating bearing seat and the constraint action of the plate spring on the floating bearing seat, the requirement on bearing precision can be correspondingly reduced, and the cost increase caused by adopting precision parts such as high-precision bearings and the like is avoided.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an isometric view of a Stirling refrigerator provided in an embodiment of the utility model;

FIG. 2 is a cross-sectional view of a Stirling cooler provided in an embodiment of the utility model;

fig. 3 is a schematic structural diagram of a spindle with a leaf spring according to an embodiment of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Example 1

As shown in fig. 1 and fig. 2, the embodiment of the utility model provides a rotary stirling refrigerator, which comprises a case 1 and a rotating shaft 2, wherein two groups of bearing seats 3 are arranged in the case 1, two ends of the rotating shaft 2 are respectively arranged on the two groups of bearing seats 3, and at least one group of bearing seats 3 is a floating bearing seat 3; the inside of the case 1 is provided with a guide seat 13 in a matching way, the floating bearing seat 3 is movably arranged on the guide seat 13, the moving direction of the floating bearing seat 3 is parallel to the axial direction of the rotating shaft 2, and the floating bearing seat 3 is provided with an axial buffer structure.

Wherein, floating bearing frame 3 and guide holder 13 direction cooperation, that is guide holder 13 can reliably guide the axial activity of floating bearing frame 3 promptly, restricts the activity of other directions of floating bearing frame 3, can guarantee the activity smoothness, the position accuracy and the operational reliability of floating bearing frame 3 and pivot 2. In one embodiment, as shown in fig. 2, a guide groove is formed in the guide seat 13, and the floating bearing seat 3 is movably disposed in the corresponding guide groove and is in clearance fit with the groove wall of the guide groove, and the groove depth direction of the guide groove is parallel to the axial direction of the rotating shaft 2.

Further, as shown in fig. 2, the guide groove is a stepped groove, and the outer peripheral side wall of the floating bearing seat 3 is correspondingly stepped, so that, on the one hand, a multi-stage guide structure can be formed to improve the guide reliability, and on the other hand, the stepped surface of the stepped groove can play a role in stroke restriction.

In an alternative embodiment, the buffer pad is arranged on the step surface and/or the groove bottom of the step-shaped groove, so that the buffer effect can be achieved, and related parts such as the rotating shaft 2 and the like can be better protected; the cushion pad may accordingly form the axial cushion structure described above.

In one of the embodiments, as shown in fig. 2 and 3, the axial damping structure comprises a leaf spring 4, said leaf spring 4 being connected to a corresponding guide seat 13.

The plate spring 4 is an archimedes spiral plate spring, and the plate surface is preferably perpendicular to the axial direction of the rotating shaft 2, so that the restraint and buffer effects can be reliably exerted.

In a preferred scheme, the plate spring 4 is an annular plate spring, the inner ring of the plate spring 4 is fixedly connected with the floating bearing seat 3 coaxially, and the outer ring of the plate spring 4 is fixedly connected with the corresponding guide seat 13; based on the structure, the uniformity of the stress of the floating bearing seat 3 in all directions can be ensured, and the phenomenon that the axial mobility of the rotating shaft 2 is influenced and the working abnormality of a refrigerator is caused due to the overlarge friction resistance between the floating bearing seat 3 and the guide seat 13 is avoided.

The plate spring 4 and the floating bearing seat 3 are preferably detachably connected, for example, an inner ring of the plate spring 4 is connected with the floating bearing seat 3 through a plurality of first threaded fasteners, the first threaded fasteners can be screws and the like, and the first threaded fasteners are preferably uniformly distributed at intervals along the circumferential direction of the plate spring 4, so that the uniformity of the deformation degree of the plate spring 4 is ensured; the plate spring 4 and the guide seat 13 are also preferably detachably connected, for example, an outer ring of the plate spring 4 is connected with the guide seat 13 through a plurality of second threaded fasteners, the second threaded fasteners can be screws, and the second threaded fasteners are uniformly distributed at intervals along the circumferential direction of the plate spring 4, so that the uniformity of the deformation degree of the plate spring 4 is ensured.

In the above-described solution provided with guide grooves, the leaf springs 4 are preferably connected around the notches of the corresponding guide grooves.

In one embodiment, a cushion block 41 is clamped at the connection part between the leaf spring 4 and the guide seat 13, so that the leaf spring 4 is prevented from being in direct contact with the guide seat 13.

The guide seat 13 is located in the chassis 1, and may be integrally formed with the inner wall of the chassis, for example, the guide groove may be integrally formed on the inner wall of the chassis, or may be separately fixed in the chassis 1.

In the Stirling refrigerator provided by the embodiment, the bearing seat 3 is configured for the rotating shaft 2, the bearing seat 3 is designed to be a floating bearing seat 3, the bearing seat 3 and the rotating shaft 2 are allowed to generate axial displacement within a certain range, the situation that shafting movement is unbalanced due to overlarge rigidity of a rotating shaft mounting structure is avoided, and refrigerator abnormal conditions such as noise, jiao Wen fluctuation and current fluctuation are well avoided; the bearing seat 3 receives the bearing 31, maintains the circumferential rotation motion of the bearing 31, can effectively maintain the working stability of the rotating shaft 2 and the bearing 31, and improves the service life of parts.

The floating bearing seat 3 can play a role in buffering due to the arrangement of an axial buffering structure, so that related parts such as the rotating shaft 2 and the like are better protected; when the plate spring 4 is adopted to connect the floating bearing seat 3 and the guide seat 13, the plate spring 4 can play a role in buffering, and can well restrain the floating bearing seat 3, so that the working reliability and stability of a shafting are improved, and the working reliability and the refrigerating precision of the refrigerating machine are improved; the leaf spring 4 has the characteristic of precise machining, can ensure the precision of parameters such as size, rigidity and the like, realizes precise assembly, and can remarkably improve the stability of shafting movement; under the constraint action of the guide seat 13 on the floating bearing seat 3 and the constraint action of the plate spring 4 on the floating bearing seat 3, the requirement on bearing precision can be correspondingly reduced, and the cost increase caused by adopting precision parts such as high-precision bearings and the like is avoided.

Wherein, it is preferable to design two groups of bearing seats 3 to be the floating bearing seats 3, and the floating amounts of the two groups of floating bearing seats 3 are mutually restrained and mutually complemented, so that the stability and reliability of the shafting movement can be further improved. When only one set of bearing blocks 3 is designed as a floating bearing block 3, the bearing 31 in the other bearing block 3 is correspondingly designed to be axially movable.

Under the condition that the structural size of the refrigerator is allowed, the plate springs 4 arranged on each group of floating bearing seats 3 can be not limited to one, and when the number of the plate springs 4 is increased, the stability of shafting movement can be correspondingly improved, and the axial movement amount of the floating bearing seats 3 is controlled more accurately.

Example two

This embodiment further optimizes the stirling cooler provided in the first embodiment described above.

As shown in fig. 1 and 2, the case 1 includes a main case 11 and a driving case 12, the main case 11 and the driving case 12 are respectively provided with a sealing flange 14 and are correspondingly flange-assembled, one end of the rotating shaft 2 is located in the driving case 12 and is connected with a power unit in the driving case 12, and the other end of the rotating shaft 2 is located in the main case 11 and is connected with a transmission structure in the main case 11.

In one embodiment, the power unit comprises a motor stator and a motor rotor which are matched, and the rotating shaft 2 is connected with the motor rotor.

In one embodiment, the transmission structure comprises an eccentric wheel mounted on the rotating shaft 2, the eccentric wheel drives a compression piston and the like to move through a compression connecting rod, and the eccentric wheel drives a pushing piston to move through a pushing connecting rod.

Further preferably, as shown in fig. 2, the refrigerator further comprises an annular seal 6; the annular sealing grooves 5 are arranged on the flange faces of the two sealing flanges 14, and the sealing element 6 is embedded in the sealing groove 5 on one flange face and is extruded to the sealing groove 5 on the other flange face.

Based on the structure, the sealing pieces 6 are respectively filled with the annular sealing grooves 5 on the two sealing flanges 14, so that the difficulty of escape leakage of high-pressure gas in the case 1 through gaps between the sealing flanges 14 is greatly increased, the structural tightness of the case 1 is effectively improved, and the influence on the normal operation of the refrigerator due to the leakage of the high-pressure gas is prevented.

In one embodiment, a plurality of sealing grooves 5 are formed on one flange surface, so that the sealing member 6 is continuously extruded and deformed, the tortuosity of the gas leakage path is obviously increased, the labyrinth sealing effect is achieved, and the structural tightness of the chassis 1 can be further improved. Further, when a plurality of seal grooves 5 are provided on the flange surface, the seal grooves 5 are concentrically arranged on the flange surface.

When one of the flange faces is provided with a plurality of seal grooves 5 (defined as first seal grooves) and the other flange face is provided with one seal groove 5 (defined as second seal groove), the notch of each first seal groove is preferably located within the notch range of the second seal groove, the main body of the seal 6 is accommodated in the second seal groove, and the projecting portion is pressed into each first seal groove. With this structure, the probability of damage to the sealing member 6 can be reduced, and the service life of the sealing member 6 can be prolonged.

In one embodiment, as shown in fig. 2, at least part of the sealing grooves 5 are V-shaped grooves 51, so that the contact tightness between the sealing element 6 and the V-shaped sealing grooves 51 is higher, and the sealing effect can be correspondingly improved; when the partial seal groove 5 is a rectangular groove and the partial seal groove 5 is a V-shaped groove 51, a seal mode combining face seal and line seal can be formed, the seal area is increased in a limited size space, and the resistance in the high-pressure gas leakage process is further increased. Alternatively, as shown in fig. 2, the second sealing groove 5 is a rectangular groove, the first sealing groove 5 is a V-shaped groove 51, and a sealing structure that one rectangular groove is matched with a plurality of V-shaped grooves 51 is adopted, so that higher sealing reliability can be obtained.

Wherein, the main body of the sealing element 6 is embedded in the sealing groove 5 on one flange surface, and the sealing groove 5 can adopt a relatively larger groove depth; the extruded portion of the sealing member 6 fills the sealing groove 5 on the other flange face except for the main body portion, and the sealing groove 5 may employ a relatively small groove depth to ensure a tight contact between the sealing member 6 and each sealing groove 5.

In one embodiment, the seal 6 is a soft metal seal, including but not limited to, a soft metal such as tin, silver, copper, and the like.

Further preferably, as shown in fig. 2, an annular limiting boss 141 is formed on the flange surface of the sealing flange 14 of the driving casing 12, and the limiting boss 141 is inserted into the inner ring of the sealing flange 14 of the main casing 11, so that the structure can better limit radial movement between the driving casing 12 and the main casing 11, and further improve the stability of shafting movement.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. The utility model provides a rotation type Stirling refrigerator, includes quick-witted case and pivot, its characterized in that: two groups of bearing seats are arranged in the case, two ends of the rotating shaft are respectively arranged on the two groups of bearing seats, and at least one group of bearing seats is a floating bearing seat; the floating bearing seat is movably arranged on the guide seat, the moving direction of the floating bearing seat is parallel to the axial direction of the rotating shaft, and the floating bearing seat is provided with an axial buffer structure.

2. A rotary stirling cooler according to claim 1 wherein: the axial buffer structure comprises a plate spring, and the plate spring is connected with the corresponding guide seat.

3. A rotary stirling cooler according to claim 2 wherein: the plate spring is an annular plate spring, the inner ring of the plate spring is fixedly connected with the floating bearing seat coaxially, and the outer ring of the plate spring is fixedly connected with the corresponding guide seat.

4. A rotary stirling cooler according to claim 3 wherein: the inner ring of the plate spring is connected with the floating bearing seat through a plurality of first threaded fasteners, and the first threaded fasteners are uniformly distributed at intervals along the circumferential direction of the plate spring; and/or the outer ring of the plate spring is connected with the guide seat through a plurality of second threaded fasteners, and the second threaded fasteners are uniformly distributed at intervals along the circumferential direction of the plate spring.

5. A rotary stirling cooler according to claim 2 wherein: the plate surface of the plate spring is perpendicular to the axial direction of the rotating shaft.

6. A rotary stirling cooler according to claim 2 wherein: and the guide seat is provided with a guide groove, and the floating bearing seat is movably arranged in the corresponding guide groove and is in clearance fit with the groove wall of the guide groove.

7. A rotary stirling cooler according to claim 6 wherein: the plate spring is connected around the notch of the corresponding guide groove.

8. A rotary stirling cooler according to claim 6 wherein: and a cushion block is clamped at the joint between the plate spring and the guide seat.

9. A rotary stirling cooler according to claim 1 wherein: the floating bearing seat is movably arranged in the corresponding guide groove and is in clearance fit with the groove wall of the guide groove; the guide groove is a stepped groove, and the peripheral side wall of the floating bearing seat is correspondingly stepped.

10. A rotary stirling cooler according to claim 1 wherein: the machine case comprises a main case and a driving machine shell, the main case is in flange assembly with the driving machine shell, one end of the rotating shaft is positioned in the driving machine shell and connected with a power unit in the driving machine shell, and the other end of the rotating shaft is positioned in the main case and connected with a transmission structure in the main case.