A micro-diaphragm Stirling refrigeration system

Abstract

The present invention discloses a micro-diaphragm Stirling refrigeration system, which relates to the technical field of Stirling machines and includes a heat sink, a heat pipe, and a refrigerator body. The refrigerator body includes a housing, a cold head disposed within the housing, one end of the heat pipe connected to the cold head, and the other end of the heat pipe connected to the heat sink. An ejector diaphragm and a piston diaphragm are disposed below the cold head in sequence, a micro-dynamic motor is disposed below the piston diaphragm, and a protective adjustment assembly is disposed below the micro-dynamic motor. The present invention utilizes the aforementioned micro-diaphragm Stirling refrigeration system, which has a compact structure, small space dimensions, and low power consumption, and can achieve effective thermal management for electronic components.

Description

Technical Field

[0001] The present invention relates to the technical field of Stirling machines, in particular to a micro-diaphragm type Stirling refrigeration system. Background Art

[0002] Stirling refrigerators, with their high efficiency, low vibration, long life, and refrigerant-free design, are widely used in applications such as electronic equipment cooling and spacecraft temperature control. Conventional free-piston Stirling refrigerators employ a displacer-power piston design, requiring multiple gap sealing issues, resulting in high manufacturing costs and large axial dimensions. Summary of the Invention

[0003] The object of the present invention is to provide a micro-diaphragm Stirling refrigeration system to solve the problems raised in the above background technology and achieve cooling of electronic devices.

[0004] To achieve the above objectives, the present invention provides a micro-diaphragm Stirling refrigeration system, comprising a vapor chamber, a heat pipe, and a refrigerator body, wherein the refrigerator body comprises a housing, a cold head is provided inside the housing, one end of the heat pipe is connected to the cold head, and the other end of the heat pipe is connected to the vapor chamber;

[0005] An ejector diaphragm and a piston diaphragm are sequentially arranged below the cold head, a micro moving coil motor is arranged below the piston diaphragm, and a protection and adjustment component is arranged below the micro moving coil motor.

[0006] Preferably, an annular groove is provided on the inner wall of the casing, a regenerator is provided in the annular groove, a packaging end cover is provided on the top of the regenerator, the packaging end cover is sleeved on the top of the casing, and a through hole is provided in the center of the packaging end cover, the cold head is provided below the through hole, and the cold head, the ejector diaphragm and the piston diaphragm are all connected to the regenerator.

[0007] Preferably, the protection adjustment assembly includes a protection nut, an adjustment spring, a rubber buffer pad and an adjustment nut, a mounting groove is opened at the center of the adjustment nut, a connecting column is provided in the mounting groove, the rubber buffer pad is provided at the top of the connecting column, and the lower end of the adjustment spring is connected to the mounting groove;

[0008] The protective nut is arranged outside the bottom end of the casing.

[0009] Preferably, the micro moving coil motor includes an ejector piston rod disposed below the ejector diaphragm, the upper end of the ejector piston rod is connected to the ejector diaphragm via an end cap, and the lower end of the ejector piston rod is connected to the adjustment spring;

[0010] A folded ring is provided on the surface of the piston diaphragm, a winding coil is wound on the folded ring, and an outer stator and an inner stator are provided on the inner and outer sides of the winding coil respectively.

[0011] Preferably, the outer stator is made of permanent magnet material, and the inner stator is made of magnetic conductive material.

[0012] Preferably, an expansion chamber is formed between the cold head and the ejector diaphragm, a compression chamber is formed between the ejector diaphragm and the piston diaphragm, and a back pressure chamber is formed between the piston diaphragm and the adjusting nut. The back pressure chamber, the compression chamber, the expansion chamber and the regenerator together constitute a working medium circulation space.

[0013] Preferably, an outlet flange is provided at the circumferential edge of the compression chamber, a through hole is provided on the outlet flange, and the through hole is connected to the regenerator.

[0014] Preferably, a plurality of heat dissipation fins are evenly distributed on the outside of the housing.

[0015] Preferably, outer surfaces of the ejector diaphragm and the piston diaphragm are coated with a thermal insulation coating.

[0016] Preferably, the regenerator is made by pressing a metal mesh.

[0017] Therefore, the present invention adopts the above-mentioned micro-diaphragm Stirling refrigeration system, which has the following beneficial effects:

[0018] (1) This system combines heat pipes and the refrigerator body to achieve efficient thermal management of electronic components.

[0019] (2) The refrigerator body in this system uses a flexible diaphragm structure to replace the displacer piston and power piston in the traditional Stirling refrigerator, which greatly reduces the spatial size and noise vibration of the refrigeration system.

[0020] (3) The piston rod of the ejector in this system is equipped with an adjusting spring and an adjusting nut, which can adjust the volume of the back pressure chamber of the refrigerator body, the charging pressure and the axial stiffness of the ejector.

[0021] (4) The housing of the refrigerator body in this system is equipped with heat dissipation fins, which can effectively release the heat from the heat release end of the refrigerator to the environment.

[0022] (5) The refrigerator body in this system can operate as a generator under a certain temperature difference.

[0023] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1This is a structural schematic diagram of an embodiment of a micro-diaphragm Stirling refrigeration system of the present invention;

[0025] Figure 2 This is a schematic structural diagram of a refrigerator body of a micro-diaphragm Stirling refrigeration system according to the present invention;

[0026] Figure numerals: 100, heat spreader; 200, heat-conducting heat pipe; 300, refrigerator body; 1, cold head; 2, packaging end cover; 3, expansion chamber; 4, ejector diaphragm; 5, compression chamber; 6, outlet flange; 7, regenerator; 8, end cap; 9, piston diaphragm; 10, back pressure chamber; 11, ejector piston rod; 12, outer stator; 13, winding coil; 14, inner stator; 15, adjusting spring; 16, rubber cushion; 17, protective nut; 18, adjusting nut; 19, casing; 20, heat dissipation fin; 21, refrigerator heat absorption end; 22, refrigerator heat release end; 23, diaphragm-type push-force piston center opening. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0028] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0029] Example

[0030] See also Figure 1-Figure 2 The present invention provides a micro-diaphragm Stirling refrigeration system, comprising a vapor chamber 100, a heat pipe 200, and a refrigerator body 300, which is filled with helium as a working fluid. The refrigerator body 300 includes a housing 19, with a plurality of heat dissipation fins 20 evenly distributed on the exterior of the housing 19, which release heat from a heat release end 22 of the refrigerator body 300 to the surrounding environment.

[0031] A cold head 1 is provided inside the casing 19. The cold head 1 adopts a flat bottom structure. An ejector diaphragm 4 and a piston diaphragm 9 made of flexible materials are provided in sequence below the cold head 1. The outer surfaces of the ejector diaphragm 4 and the piston diaphragm 9 are coated with an insulating coating.

[0032] The vapor chamber 100 is attached to the heat source, and heat is transferred to the refrigerator body 300 via the heat pipe 200. One end of the heat pipe 200 is connected to the cold head 1, and the other end of the heat pipe 200 is connected to the vapor chamber 100. Multiple sets of heat pipes 200 are provided and fixedly connected to the cold head 1 and the vapor chamber 100 respectively by welding.

[0033] The inner wall of the housing 19 is provided with an annular groove, within which is mounted a regenerator 7, which is formed by pressing a metal mesh. A packaging end cap 2 is mounted on top of the regenerator 7, which is fitted over the top of the housing 19. A through-hole is provided in the center of the packaging end cap 2, beneath which is located a cold head 1. The cold head 1, the ejector diaphragm 4, and the piston diaphragm 9 are all connected to the regenerator 7.

[0034] A micro moving coil motor is provided below the piston diaphragm 9 , and a protection and adjustment component is provided below the micro moving coil motor.

[0035] like Figure 2 As shown, the micro moving coil motor includes a displacer piston rod 11 positioned below the displacer diaphragm 4. The displacer piston rod 11 passes through the central opening 23 of the diaphragm-type push piston and enters the backpressure chamber 10. The central opening 23 of the diaphragm-type push piston is located at the center of the piston diaphragm 9 and communicates with the backpressure chamber 10. The upper end of the displacer piston rod 11 is connected to the displacer diaphragm 4 via an end cap 8. The lower end of the displacer piston rod 11 is nested with an adjustment spring 15, which provides auxiliary stiffness and motion guidance. The displacer has an area difference between the expansion chamber 3 and the compression chamber 5. The surface of the piston diaphragm 9 is provided with a folded ring, around which a winding coil 13 is wound. The outer stator 12 and inner stator 14 are located on either side of the winding coil 13. The outer stator 12 is made of permanent magnet material, and the inner stator 14 is made of magnetic conductive material. The winding coil 13 is located in the magnetic gap between the outer stator 12 and the inner stator 14.

[0036] like Figure 2As shown, the protective adjustment assembly includes a protective nut 17, an adjustment spring 15, a rubber buffer pad 16, and an adjustment nut 18. A mounting groove is provided at the center of the adjustment nut 18, a connecting column is provided in the mounting groove, and the rubber buffer pad 16 is provided at the top of the connecting column. The rubber buffer pad 16 is provided to prevent the ejector from exceeding the stroke limit. The lower end of the adjustment spring 15 is fixedly connected in the mounting groove. The adjustment nut 18 has the functions of sealing the entire machine, adjusting the volume of the back pressure chamber 10, and adjusting the spring stiffness. The protective nut located at the bottom of the housing 19 of the refrigerator body 300 serves as the disassembly and assembly interface of the refrigerator body 300, and plays the role of protecting the internal structure of the entire machine.

[0037] like Figure 2 As shown, an expansion chamber 3 is formed between the cold head 1 and the displacer diaphragm 4, and a compression chamber 5 is formed between the displacer diaphragm 4 and the piston diaphragm 9. An outlet flange 6 is provided at the circumferential edge of the compression chamber 5. The outlet flange 6 has a through hole connected to the regenerator 7. A back pressure chamber 10 is formed between the piston diaphragm 9 and the adjusting nut 18. The back pressure chamber 10, the compression chamber 5, the expansion chamber 3, and the regenerator 7 together constitute the working medium circulation space.

[0038] The working principle of this system is as follows: when alternating current is passed through the winding coil 13, the piston diaphragm 9 oscillates back and forth, causing pressure fluctuations of the working gas in the working medium circulation space. The ejector diaphragm 4 oscillates back and forth under the action of the area difference on both sides, driving the working gas to flow back and forth between the expansion chamber 3 and the compression chamber 5. The working gas expands and absorbs heat in the expansion chamber 3, taking away the heat transferred by the cold head 1, and is compressed and released in the compression chamber 5, releasing the heat to the casing 19 and taken away by the heat dissipation fins 20.

[0039] The specific usage process of this system is as follows:

[0040] 1) Filling the micro-diaphragm Stirling refrigerator body 300 with a working gas of a certain pressure;

[0041] 2) Fix the heat sink 100 to the surface of the heat source;

[0042] 3) Connect the winding coil 13 terminals inside the refrigerator body 300 to the AC power supply;

[0043] 4) The micro-diaphragm Stirling refrigeration system starts to work, releasing the heat from the heat source to the heat release end 22 of the refrigerator.

[0044] In a specific embodiment, typical design and operating parameters are shown in the following table:

[0045] Table 1 Design and operation parameters

[0046] ;

[0047] In this embodiment, the cold head temperature refers to the temperature of the heat absorbing end 21 of the refrigerator (5°C). The system absorbs heat from the heat absorbing end 21 of the refrigerator and releases heat from the heat releasing end 22 of the refrigerator (room temperature), and the heat is released by the heat dissipation fins 20.

[0048] Therefore, the present invention adopts the above-mentioned micro-diaphragm Stirling refrigeration system, which has a compact structure, small space size, low power consumption and manufacturing cost, can achieve effective thermal management for electronic components, and provides a new alternative solution.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A micro-diaphragm Stirling refrigeration system, characterized by: The refrigerator comprises a vapor chamber, a heat pipe and a refrigerator body, wherein the refrigerator body comprises a housing, a cold head is provided inside the housing, one end of the heat pipe is connected to the cold head, and the other end of the heat pipe is connected to the vapor chamber; An ejector diaphragm and a piston diaphragm are sequentially arranged below the cold head, a micro moving coil motor is arranged below the piston diaphragm, and a protection and adjustment component is arranged below the micro moving coil motor; The protection adjustment assembly includes a protection nut, an adjustment spring, a rubber buffer pad and an adjustment nut. A mounting groove is provided at the center of the adjustment nut. A connecting column is provided in the mounting groove. The rubber buffer pad is provided at the top of the connecting column. The lower end of the adjustment spring is connected to the mounting groove. The protective nut is arranged outside the bottom end of the housing; The micro moving coil motor includes an ejector piston rod disposed below the ejector diaphragm, the upper end of the ejector piston rod is connected to the ejector diaphragm via an end cap, and the lower end of the ejector piston rod is connected to the adjustment spring; A folded ring is provided on the surface of the piston diaphragm, a winding coil is wound on the folded ring, and an outer stator and an inner stator are provided on the inner and outer sides of the winding coil respectively.

2. The micro-diaphragm Stirling refrigeration system according to claim 1, characterized in that: An annular groove is provided on the inner wall of the casing, a regenerator is provided in the annular groove, a packaging end cover is provided on the top of the regenerator, the packaging end cover is sleeved on the top of the casing, and a through hole is provided in the center of the packaging end cover, the cold head is provided below the through hole, and the cold head, the ejector diaphragm and the piston diaphragm are all connected to the regenerator.

3. The micro-diaphragm Stirling refrigeration system according to claim 2, characterized in that: The outer stator is made of permanent magnet material, and the inner stator is made of magnetic conductive material.

4. The micro-diaphragm Stirling refrigeration system according to claim 3, characterized in that: An expansion chamber is formed between the cold head and the ejector diaphragm, a compression chamber is formed between the ejector diaphragm and the piston diaphragm, and a back pressure chamber is formed between the piston diaphragm and the adjusting nut. The back pressure chamber, the compression chamber, the expansion chamber and the regenerator together constitute a working medium circulation space.

5. The micro-diaphragm Stirling refrigeration system according to claim 4, characterized in that: An outlet flange is provided at the circumferential edge of the compression chamber. A through hole is provided on the outlet flange, and the through hole is connected to the regenerator.

6. The micro-diaphragm Stirling refrigeration system according to claim 5, characterized in that: A plurality of heat dissipation fins are evenly distributed on the outside of the housing.

7. The micro-diaphragm Stirling refrigeration system according to claim 6, characterized in that: The outer surfaces of the displacer diaphragm and the piston diaphragm are coated with a thermal insulation coating.

8. The micro-diaphragm Stirling refrigeration system according to claim 7, characterized in that: The heat regenerator is made by pressing a metal wire mesh.

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