Stirling refrigerator
By employing a spherical connection between the expansion connecting rod and the expansion piston, along with a magnetic spring and flexible ring design, combined with a gas bearing and magnetic yoke structure, the challenges of machining and debugging have been overcome, resulting in higher reliability and longer service life.
Patent Information
- Application Number
- CN202423289896.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-12-31
AI Technical Summary
In existing Stirling refrigerators, the connecting rod and expansion piston need to be coaxial, which makes machining and debugging quite difficult.
An expansion connecting rod and an expansion piston are connected by a spherical pair, and magnetic springs and flexible rings are used to reduce precision requirements, reduce direct contact and vibration, and combine gas bearings and magnetic yoke structure to simplify the machining and debugging process.
It reduces the difficulty of machining and adjusting the expansion connecting rod and expansion piston, extends their service life, reduces wear and noise, and improves the reliability of the refrigeration unit.
Smart Images
Figure CN223755603U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of refrigeration equipment technology, specifically relating to a Stirling refrigeration machine. Background Technology
[0002] The Stirling cycle consists of two isothermal processes and two isochoric regenerative processes. Its working principle involves the exchange and conversion of heat during the compression and expansion of a gas. A Stirling refrigerator is a refrigeration device based on the Stirling cycle. Through the coordinated operation of rationally designed components such as the compressor, cooler, regenerator, and expander, it demonstrates high potential for achieving low-temperature refrigeration.
[0003] As Stirling refrigerators are widely used in aerospace, medical, and exploration fields, their reliability requirements are also increasing. Existing Stirling refrigerators require a long connecting rod to connect the expander piston to the expander assembly. Due to the length of the connecting rod and the need to ensure coaxiality and precision, machining and debugging are quite challenging. Utility Model Content
[0004] The technical problem to be solved by this application is that the connecting rod and expansion piston in the existing Stirling refrigerator need to be coaxial, which is difficult to process and debug. In order to solve this technical problem, a Stirling refrigerator that can reduce the difficulty of processing and debugging is provided.
[0005] The technical solution proposed in this application is as follows:
[0006] A Stirling refrigerator, comprising:
[0007] A housing and a cylinder, wherein the cylinder is fixedly connected to the housing;
[0008] An expansion piston is reciprocally disposed within the cylinder in a first direction;
[0009] A magnetic spring is disposed within the housing, and the magnetic spring includes a stator and a mover, the stator being fixedly connected to the housing;
[0010] An expansion connecting rod extends along the first direction, and one end of the expansion connecting rod is connected to the expansion piston through a spherical joint to drive the expansion piston to reciprocate along the first direction. The other end of the expansion connecting rod is connected to the mover.
[0011] Furthermore, the Stirling refrigerator also includes a vibration damper connected to the outer side of the housing near the magnetic spring.
[0012] Furthermore, the Stirling refrigerator also includes a flexible ring disposed between the expansion connecting rod and the expansion piston.
[0013] Further, the Stirling cryocooler further comprises a compression piston, the compression piston is arranged in the cylinder reciprocally along the first direction, the expansion connecting rod penetrates the compression piston and is coaxially arranged with the compression piston.
[0014] Further, the Stirling cryocooler further comprises an outer magnetic yoke, an inner magnetic yoke, a skeleton and a magnetic ring, the outer magnetic yoke is fixedly connected to the shell, the inner magnetic yoke is fixedly connected to the cylinder, and the outer magnetic yoke and the inner magnetic yoke are arranged in a spaced manner along a direction perpendicular to the first direction, the skeleton is fixedly connected to the compression piston, and the skeleton partially extends into the space between the outer magnetic yoke and the inner magnetic yoke, and the magnetic ring is arranged on the part of the skeleton extending into the space between the outer magnetic yoke and the inner magnetic yoke; a coil is arranged on the outer magnetic yoke.
[0015] Further, the outer magnetic yoke and the inner magnetic yoke are arranged in a spaced manner with the skeleton.
[0016] Further, the gap between the outer magnetic yoke and the inner magnetic yoke and the skeleton is 0.2-0.6mm.
[0017] Further, the Stirling cryocooler further comprises a gas bearing, the gas bearing is arranged between the compression piston and the cylinder.
[0018] Further, the Stirling cryocooler further comprises a fixed shell and a wire mesh, the fixed shell is fixedly connected to the outer side of the expansion piston, and the wire mesh is filled in the fixed shell.
[0019] Further, the expansion piston is provided with a spherical recess, the end of the expansion connecting rod away from the magnetic spring is provided with a spherical protrusion, and the spherical protrusion is connected with the spherical recess.
[0020] By using the above Stirling cryocooler, the spherical pair is arranged between the expansion connecting rod and the expansion piston, so that the expansion connecting rod and the expansion piston can relatively move, thereby reducing the precision requirement of the butt joint between the two, and reducing the processing difficulty and the debugging difficulty. Meanwhile, the end of the expansion connecting rod away from the expansion piston is connected with the magnetic spring, compared with the plate spring connected with the expansion connecting rod, the installation and debugging difficulty is reduced, and the service life is prolonged. 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 present application together with the embodiments thereof, and explain the present application, but are not for restricting the present application.
[0022] Figure 1 The structure schematic diagram of the Stirling cryocooler provided by an embodiment of the present application.
[0023] Label explanation:
[0024] 110, housing; 111, outer shell; 112, end cap; 120, cylinder; 130, expansion piston; 140, magnetic spring; 141, stator; 142, rotor; 150, expansion link; 151, spherical protrusion; 160, damper; 170, flexible ring; 180, fixed shell; 190, wire mesh; 210, compression piston; 220, outer magnetic yoke; 230, inner magnetic yoke; 240, backbone; 250, magnetic ring; 260, coil. DETAILED DESCRIPTION
[0025] 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 of ordinary skill in the art without creative labor fall within the scope of protection of the present application.
[0026] 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 devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0027] As shown in Figure 1 The present application provides a Stirling refrigerator, which comprises a housing 110 and a cylinder 120. The housing 110 and the cylinder 120 are fixedly connected, and can be fixedly connected by means of glue bonding or welding. Specifically, Figure 1 The cylinder 120 is located at one end of the housing 110 along a first direction. Further, the housing 110 comprises an outer shell 111 and an end cap 112, the cylinder 120 is connected to one end of the outer shell 111, and the end cap 112 is connected to the other end of the outer shell 111 away from the cylinder 120. It can be understood that the first direction is Figure 1 the left-right direction in
[0028] In one embodiment, the Stirling cryocooler further comprises an expansion piston 130, a magnetic spring 140 and an expansion connecting rod 150. The expansion piston 130 is arranged in the cylinder 120 to be reciprocable in the first direction, the magnetic spring 140 is arranged in the housing 110 and fixedly connected with the end cover 112, and the expansion connecting rod 150 extends in the first direction and has one end connected with the expansion piston 130 and the other end connected with the magnetic spring 140 to drive the expansion piston 130 to reciprocate in the first direction.
[0029] Further, the magnetic spring 140 comprises a stator 141 and a rotor 142, the stator 141 is fixedly connected with the end cover 112, the rotor 142 is movably arranged relative to the stator 141 and connected with the expansion connecting rod 150, and the expansion connecting rod 150 has one end connected with the expansion piston 130 through a spherical pair. Figure 1 In the embodiment shown, the expansion piston 130 is provided with a spherical recess, and the expansion connecting rod 150 is provided with a spherical protrusion 151 at the end away from the magnetic spring 140, and the spherical protrusion 151 is connected with the spherical recess. Of course, in other embodiments, a spherical protrusion 151 can be arranged on the expansion piston 130, and a spherical recess connected with the spherical protrusion 151 can be arranged on the expansion connecting rod 150, as long as the two can be connected through a spherical pair and can move relative to each other, which is not limited herein.
[0030] With the Stirling cryocooler described above, the expansion connecting rod 150 and the expansion piston 130 are connected through a spherical pair, so that the expansion connecting rod 150 and the expansion piston 130 can move relative to each other, thereby reducing the precision requirement of the butt joint between the two, and reducing the processing difficulty and debugging difficulty. At the same time, the end of the expansion connecting rod 150 away from the expansion piston 130 is connected with the magnetic spring 140, which reduces the installation and debugging difficulty compared with connecting the expansion connecting rod 150 with the magnetic spring 140 through a plate spring, and prolongs the service life.
[0031] In one embodiment, the Stirling cryocooler further comprises a shock absorber 160 connected with the outside of the housing 110. Specifically, Figure 1 In the embodiment shown, the shock absorber 160 is connected with the end cover 112 to reduce the vibration of the cryocooler during operation.
[0032] In one embodiment, the Stirling cryocooler further comprises a flexible ring 170 arranged between the expansion connecting rod 150 and the expansion piston 130. Specifically, Figure 1In the shown embodiment, the flexible ring 170 is arranged between the spherical recess and the spherical protrusion 151 to avoid contact between the two while achieving connection of the two by a spherical pair, thereby reducing vibration and wear between the expansion connecting rod 150 and the expansion piston 130 and reducing noise. Specifically, the flexible ring 170 is an O-ring and can be made of rubber or other flexible and wear-resistant materials.
[0033] In one embodiment, the Stirling refrigerator further comprises a fixed shell 180 fixedly connected to the outside of the expansion piston 130 and a wire mesh 190 filled in the fixed shell 180 to achieve a regenerative effect during refrigeration. The fixed shell 180 can be connected to the expansion piston 130 by means of adhesive.
[0034] In one embodiment, the Stirling refrigerator further comprises a compression piston 210 arranged in the cylinder 120 in a reciprocating manner along the first direction, and the expansion connecting rod 150 penetrates the compression piston 210 and is coaxially arranged with the compression piston 210. Further, the compression piston 210 penetrates a central hole along the first direction, and the expansion connecting rod 150 penetrates the central hole. In combination with the above embodiment, the expansion connecting rod 150 and the expansion piston 130 are connected by a spherical pair, and the expansion connecting rod 150 can also adapt to the friction gap between the expansion connecting rod 150 and the compression piston 210, thereby reducing vibration and wear between the expansion connecting rod 150 and the compression piston 210.
[0035] In one embodiment, the Stirling refrigerator further comprises a gas bearing arranged between the compression piston 210 and the cylinder 120 to enable the compression piston 210 to reciprocate in the cylinder 120 along the first direction while reducing friction and vibration during movement and reducing noise. Similarly, to reduce friction and vibration between the expansion piston 130 and the cylinder 120, a gas bearing can also be arranged between the expansion piston 130 and the cylinder 120.
[0036] In one embodiment, the Stirling refrigerator further comprises an outer magnetic yoke 220 fixedly connected to the shell 110, an inner magnetic yoke 230 fixedly connected to the cylinder 120, and a skeleton 240 fixedly connected to the compression piston 210 and partially extending between the outer magnetic yoke 220 and the inner magnetic yoke 230, and a magnetic ring 250 arranged on the part of the skeleton 240 extending between the outer magnetic yoke 220 and the inner magnetic yoke 230. Figure 1 The outer magnetic yoke 220 and the inner magnetic yoke 230 are arranged in a direction perpendicular to the first direction, i.e.
[0037] It should be noted that after the coil 260 is passed through the alternating current, the magnetic ring 250 reciprocates along the first direction under the action of the alternating electromagnetic force, thereby driving the skeleton 240 and the compression piston 210 to reciprocate along the first direction. The expansion piston 130 is driven by gas, and the displacement phase difference between the expansion piston 130 and the compression piston 210 can generate a refrigeration effect during the reciprocating movement of the expansion piston 130 and the compression piston 210. The specific principle is well known in the art and will not be repeated here.
[0038] In summary, the Stirling refrigerator in the above embodiments has at least the following advantages:
[0039] 1. The expansion connecting rod 150 and the expansion piston 130 are separately arranged and connected through a spherical pair, which reduces the difficulty of machining and installation and debugging;
[0040] 2. The flexible ring 170 is arranged between the spherical convex part 151 and the spherical concave part to avoid direct contact between the expansion connecting rod 150 and the expansion piston 130 while achieving connection through a spherical pair, thereby reducing wear and vibration;
[0041] 3. The end of the expansion connecting rod 150 away from the expansion piston 130 is connected with the mover 142 of the magnetic spring 140, which not only reduces the difficulty of installation and debugging, but also prolongs the service life;
[0042] 4. The pneumatic bearing is arranged between the compression piston 210 and the cylinder 120, which reduces the friction therebetween and enables the compression piston 210 to be free of radial support and reciprocating elastic force provided by a leaf spring.
[0043] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.
Claims
1. A Stirling cryocooler characterised in that, The shell and the cylinder are fixedly connected; The expansion piston is arranged in the cylinder and is reciprocally movable in the first direction; The magnetic spring is arranged in the shell, and the magnetic spring comprises a stator and a mover, and the stator is fixedly connected to the shell; The expansion connecting rod extends in the first direction, and one end of the expansion connecting rod is connected to the expansion piston through a spherical pair to drive the expansion piston to reciprocally move in the first direction, and the other end of the expansion connecting rod is connected to the mover. The shock absorber is connected to the shell outside and close to one end of the magnetic spring.
2. A Stirling cryocooler according to claim 1 characterised in that, The flexible ring is arranged between the expansion connecting rod and the expansion piston.
3. A Stirling cryocooler according to claim 1 characterised in that, The compression piston is arranged in the cylinder and is reciprocally movable in the first direction, the expansion connecting rod penetrates the compression piston and is coaxially arranged with the compression piston.
4. A Stirling cryocooler according to claim 1 characterised in that, The outer magnetic yoke is fixedly connected to the shell, the inner magnetic yoke is fixedly connected to the cylinder, and the outer magnetic yoke and the inner magnetic yoke are arranged in a direction perpendicular to the first direction, the skeleton is fixedly connected to the compression piston, and the skeleton partially extends into the outer magnetic yoke and the inner magnetic yoke, and the magnetic ring is arranged on the part of the skeleton extending into the outer magnetic yoke and the inner magnetic yoke; the coil is arranged on the outer magnetic yoke.
5. A Stirling cryocooler according to claim 4 characterised in that, The outer magnetic yoke and the inner magnetic yoke are arranged in a direction perpendicular to the first direction.
6. A Stirling cryocooler according to claim 5 characterised in that, The gap between the outer magnetic yoke, the inner magnetic yoke and the skeleton is 0.2-0.6mm.
7. A Stirling cryocooler according to claim 6 characterised in that, The gas bearing is arranged between the compression piston and the cylinder.
8. A Stirling cryocooler according to claim 4 characterised in that, The fixed shell is fixedly connected to the outside of the expansion piston, and the wire mesh is filled in the fixed shell.
9. A Stirling cryocooler according to claim 1 characterised in that, The expansion piston is provided with a spherical recess, and the expansion connecting rod is provided with a spherical protrusion at the end away from the magnetic spring, and the spherical protrusion is connected to the spherical recess.
10. A Stirling cryocooler according to claim 1 characterised in that,