A miniature compact integrated linear Stirling refrigerator

Abstract

The present invention discloses a miniature, compact, integrated linear Stirling refrigerator, comprising a cold finger assembly, a linear compressor assembly, and an integrated base assembly. The cold finger assembly and the linear compressor assembly are mounted on the integrated base assembly in a T-shaped configuration. The present invention utilizes a compact structure in which the cold finger assembly and the linear compressor are mounted together on the integrated base assembly, with the cold finger assembly radially embedded within the linear compressor. This facilitates installation and removal by the user. Compared to a split-type Stirling refrigerator, the present invention eliminates the need for a connecting pipe structure, reduces the dead volume of the refrigerator, and improves the cooling efficiency of the refrigerator.

Description

Technical Field

[0001] The present invention relates to a Stirling refrigerator, in particular to a miniature compact integral linear Stirling refrigerator. Background Art

[0002] Infrared detection systems offer advantages such as high resolution, good concealment, and excellent anti-interference capabilities. They are widely used in aerospace infrared remote sensing, medical treatment, military affairs, communications, and toxic gas monitoring. Cryogenically cooling infrared detectors significantly improves their response speed, sensitivity, detection range, and reduces the impact of background noise. Therefore, Stirling coolers, with their compact structure, fast startup, and wide temperature control range, are widely used to cool the focal plane of infrared detectors. Split Stirling coolers, connected by connecting pipes between the compressor and expander, are bulky, have large dead volume, and are heavy, making them difficult to install and disassemble. Summary of the Invention

[0003] In view of this, the present invention provides a miniature compact integrated linear Stirling refrigerator to solve the problems of a split Stirling refrigerator having a large overall structure, heavy mass, and difficulty in installation and disassembly.

[0004] To achieve the above object, the present invention adopts the following structure:

[0005] A miniature compact integrated linear Stirling refrigerator comprises a cold finger assembly, an integrated base assembly, a linear compressor assembly, a rear end cover, a fixing nut, a column spring, a spring seat, and a shell; the cold finger assembly comprises an expansion cylinder assembly, a cold storage assembly, and a coupling assembly; the cold storage assembly is placed inside the expansion cylinder assembly; the front and rear ends of the integrated base assembly are respectively welded and fixed to the expansion cylinder assembly and the rear end cover, and the upper and lower sides thereof are respectively welded and fixed to the shell to form a closed space capable of bearing high pressure; the linear compressor assembly is placed in the closed space and welded and fixed to the integrated base assembly; the coupling assembly passes through the linear compressor assembly, one end of the coupling assembly is connected to the expansion cylinder assembly, and the other end is connected in sequence to the spring seat, the column spring, and the fixing nut; one end of the column spring is fixed to the spiral groove of the spring seat, and the other end is fixed to the spiral groove of the fixing nut.

[0006] Furthermore, the integral base assembly includes a base, a valve core, a clamping screw, a two-core connector and a shaft bushing; the base has a circular ring structure, a support frame is provided inside the base, the support frame is provided with a through hole, the central axis of the through hole coincides with the central axis of the base circular ring; the coupling assembly is placed in the through hole, the shaft bushing is placed between the support frame and the coupling assembly, and the shaft bushing is indirectly sealed with the support frame and the coupling assembly respectively; the support frame is provided with a boss and a threaded inner hole at a position perpendicular to the central axis of the through hole, the two-core connector is welded and fixed to the boss, the valve core is placed in the inner hole and is clamped by the clamping screw.

[0007] Furthermore, the expansion cylinder assembly includes an expansion cylinder and a cold head, and the cold head is welded and fixed to one end of the expansion cylinder; the cold storage assembly is placed in a cavity formed by the expansion cylinder and the cold head, and is sealed with a gap from the expansion cylinder.

[0008] Furthermore, the cold storage device assembly includes a cold end cover of the cold storage device, a cold storage device shell, a wire mesh, and a ball head seat; the cold end cover of the cold storage device is bonded to the front end of the cold storage device shell, the wire mesh is filled inside the cold storage device shell, and the ball head seat is bonded to the rear end of the cold storage device shell; through holes are provided in the middle and on both sides of the ball head seat, and the through holes are interconnected.

[0009] Furthermore, the coupling assembly includes a standard shaft, a ball head, and a ball head socket; the ball head contains an internal tapped thread, and the front end of the standard shaft is connected to the ball head through a thread; one side of the ball head socket is connected to the ball head seat, and one side is connected to the ball head; the ball head socket has chamfered edges on both sides, and vents are provided at the chamfered edges, which are connected to the vents on both sides of the ball head seat.

[0010] Furthermore, the linear compressor assembly includes a leaf spring assembly, a compression piston assembly, a magnetic steel assembly, an external magnetic circuit assembly, and an inner magnetic pole compressor cylinder; the compression piston assembly passes through the leaf spring assembly and is fixed by a nut; the magnetic steel assembly is welded and fixed to both sides of the compression piston assembly; the inner magnetic pole compressor cylinder is placed between the compression piston assembly and the magnetic steel assembly, and is indirectly sealed with the compression piston assembly; the external magnetic circuit assembly is placed on the outside of the magnetic steel assembly, and one end of the external magnetic circuit assembly is welded and fixed to the leaf spring assembly.

[0011] Furthermore, the linear compressor assembly has a symmetrical structure with the coupling assembly as the central axis; the coupling assembly is placed in the inner hole formed by the inner magnetic pole compressor cylinder which is symmetrical in the upper and lower directions.

[0012] Furthermore, the linear compressor assembly has a symmetrical structure with the compression piston assembly as the central axis.

[0013] Furthermore, the expansion cylinder assembly and the cold storage assembly form an expansion chamber; the integral base assembly and the coupling assembly form a first compression chamber; the linear compressor assembly and the integral base assembly form a second compression chamber; the expansion chamber is connected to the first compression chamber; and the first compression chamber is connected to the second compression chamber.

[0014] Compared with the existing structure, the advantages of the present invention are:

[0015] The present invention installs the cold finger assembly and the linear compressor together on an integral base assembly. The cold finger assembly is radially embedded in the linear compressor in a compact structure, which is convenient for users to install and disassemble. Compared with the split Stirling refrigerator, the connecting pipe structure is omitted, the dead volume of the refrigerator is reduced, and the refrigeration efficiency of the refrigerator is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of an integrated Stirling refrigerator in one embodiment;

[0017] Figure 2 This is a schematic diagram of the structure of an integral base assembly in one embodiment;

[0018] Figure 3 This is a schematic structural diagram of an expansion cylinder assembly in one embodiment;

[0019] Figure 4 This is a schematic structural diagram of a cold storage assembly in one embodiment;

[0020] Figure 5 This is a schematic structural diagram of a coupling assembly in one embodiment;

[0021] Figure 6 This is a schematic structural diagram of a linear compressor assembly in one embodiment;

[0022] The numbers in the figure are as follows:

[0023] Expansion cylinder assembly, 101-expansion cylinder, 102-cold head;

[0024] Cold storage assembly, 201-cold storage cold end cover, 202-cold storage shell, 203-wire mesh, 204-ball head seat;

[0025] Integral base assembly, 301-base (301), 302-valve core, 303-pressing screw, 304-two-core connector, 305-shaft bushing, 306-support frame;

[0026] Coupling assembly, 401-standard shaft, 402-ball head, 403-ball head socket;

[0027] Linear compressor assembly, 501-leaf spring assembly, 502-compression piston assembly, 503-magnetic steel assembly, 504-external magnetic circuit assembly, 505-inner magnetic pole compressor cylinder;

[0028] Rear end cover; 7-fixing nut; 8-column spring; 9-spring seat; 10-housing; 11-expansion chamber; 12-first compression chamber; 13-second compression chamber. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Combine Figures 1 to 6 This embodiment discloses a miniature compact integrated linear Stirling refrigerator, including a cold finger assembly, an integrated base assembly 3, a linear compressor assembly 5, a rear end cover 6, a fixing nut 7, a column spring 8, a spring seat 9, and a housing 10; the cold finger assembly is an integral structure, including an expansion cylinder assembly 1, a cold storage assembly 2, and a coupling assembly 4.

[0031] Among them, the expansion cylinder assembly 1 includes an expansion cylinder 101 and a cold head 102, and the cold head 102 is welded and fixed to one end of the expansion cylinder 101; the cold storage assembly 2 includes a cold storage cold end cover 201, a cold storage shell 202, a wire mesh 203, and a ball head seat 204; the cold storage cold end cover 201 is bonded to the front end of the cold storage shell 202, and the wire mesh 203 is filled inside the cold storage shell 202. Specifically, the number of wire meshes 203 is 800~1000 pieces, and the ball head seat 204 is bonded to the rear end of the cold storage shell 202; through holes are provided in the middle and on both sides of the ball head seat 204, and the through holes are interconnected. The cold storage assembly 2 is placed inside the expansion cylinder assembly 1. Specifically, the cold storage assembly 2 is placed in the cavity formed by the expansion cylinder 101 and the cold head 102, and is sealed with the expansion cylinder 101. Preferably, the single-side gap is 5~10μm; the expansion cylinder assembly 1 and the cold storage assembly 2 form an expansion cavity 11.

[0032] The coupling assembly 4 includes a standard shaft 401, a ball head 402, and a ball head socket 403; the ball head 402 contains an internal tapping thread, and the front section of the standard shaft 401 is connected to the ball head 402 by a thread. Specifically, the front end of the standard shaft 401 passes through the ball head 402 and is connected to the ball head socket 403, and the rear end is connected to the spring seat 9, the column spring 8, and the fixing nut 7 in sequence; specifically, the spring seat 9 is fixed on the standard shaft 401, and the column spring 8 is adjacently sleeved on the standard shaft 401 and locked by the fixing nut. More specifically, one end of the column spring 8 is fixed to the spiral groove of the spring seat 9, and the other end is fixed to the spiral groove of the fixing nut 7. One side of the ball head socket 403 is connected to the ball head seat 204, and the other side is connected to the ball head 402. It is foreseeable that the cold storage assembly 2 and the coupling assembly 4 form a whole through the ball head socket 403; as a preferred embodiment, the ball head socket 403 has chamfered edges on both sides, and vents are provided at the chamfered edges, which are connected to the vents on both sides of the ball head seat 204.

[0033] The integral base assembly 3 includes a base 301, a valve core 302, a tightening screw 303, a two-core connector 304 and a shaft bushing 305; the base 301 has a circular ring structure, and a support frame 306 is provided inside the base 301. Preferably, the base 301 and the support frame 306 are an integrated structure; the support frame 306 is provided with a through hole, wherein the central axis of the through hole coincides with the central axis of the circular ring of the base 301; the coupling assembly 4 is placed in the through hole, specifically, the standard shaft 401 in the coupling assembly 4 is located in the through hole; the shaft bushing 305 is placed between the support frame 306 and the coupling assembly 4, and the shaft bushing 305 It is indirectly sealed with the support frame 306 and the coupling assembly 4 respectively. Preferably, the unilateral gap between the shaft bushing 305 and the support frame 306 is 5~10μm, and the unilateral gap between the shaft bushing 305 and the coupling assembly 4 is less than 5μm; the support frame 306 is respectively provided with a boss and a threaded inner hole at a position perpendicular to the central axis of the through hole, and the two-core connector 304 is welded and fixed to the boss, and the valve core 302 is placed in the inner hole and is tightened by the clamping screw 303. More specifically, the other side of the valve core 302 is sealed by a seal, and the valve core 302 is squeezed by the clamping screw 303 to form a seal. The front and rear ends of the integral base assembly 3 are respectively welded to the expansion cylinder assembly 1 and the rear end cover 6, and the upper and lower sides are respectively welded to the outer shell 10 to form a closed space that can withstand high pressure. More specifically, the two ends of the through hole of the support seat 306 are respectively welded to the expansion cylinder 101 and the rear end cover 6, and the two sides of the base 301 are respectively welded to the outer shell to form a closed space that can withstand high pressure.

[0034] The linear compressor assembly 5 is placed in a closed space and welded to the integral base assembly 3; the coupling assembly 4 passes through the linear compressor assembly 5. The linear compressor assembly 5 includes a leaf spring assembly 501, a compression piston assembly 502, a magnetic steel assembly 503, an external magnetic circuit assembly 504, and an inner magnetic pole compressor cylinder 505; the compression piston assembly 502 passes through the leaf spring assembly 501 and is fixed by a nut. Preferably, the compression piston assembly 501 and the leaf spring assembly are coaxial; the magnetic steel assembly 503 is welded and fixed to both sides of the compression piston assembly 502. Specifically, the magnetic steel assembly 503 consists of a magnet, a magnetic steel support, and a magnetic steel pressing block. The magnet is glued to the inner wall of the magnetic steel support and the upper end is fixed to the inner wall groove of the magnetic steel support, and the lower end is welded and fixed to the magnetic steel pressing block. Preferably, the magnet consists of 12 tile-shaped magnetic steel active radial magnetic rings; the inner magnetic pole compressor cylinder 505 is placed between the compression piston assembly 502 and the magnetic steel assembly 503 and is fixed to the compression piston assembly. Component 502 is indirectly sealed, specifically, the outer surface of the compression piston assembly 502 has a lubricating coating, and the single-sided gap with the inner magnetic pole compression cylinder 505 is 5~10μm, and the gap between the inner magnetic pole compressor cylinder 505 and the magnetic steel assembly 503 is 0.3~0.5mm; the external magnetic circuit assembly 504 is placed on the outside of the magnetic steel assembly 503, one end of the external magnetic circuit assembly 504 is welded and fixed to the leaf spring assembly 501, and the other end is welded and fixed to the base 301, specifically, the external magnetic circuit assembly 504 includes an upper external magnetic pole, a lower external magnetic pole and a coil, wherein the coil is wrapped and fixed by the upper external magnetic pole and the lower external magnetic pole, the upper end of the upper external magnetic pole is welded and fixed to the leaf spring assembly 501, and the lower end is welded and fixed to the lower external magnetic pole, the upper end of the lower external magnetic pole is welded and fixed to the lower end of the upper external magnetic pole, and the lower end is welded and fixed to the base 301. Preferably, linear compressor assembly 5 has a symmetrical structure with coupling assembly 4 as the central axis. Specifically, linear compressor assembly 5 is symmetrical about the central axis of the through hole of support frame 306. Linear compressor assembly 5 also has a symmetrical structure with compression piston assembly 502 as the central axis. Specifically, linear compressor assembly 5 and compression piston assembly 502 are coaxially symmetrical, that is, linear compressor assembly 5 is vertically and bilaterally symmetrical. Coupling assembly 4 is positioned within the inner hole formed by the vertically symmetrical inner magnetic pole compressor cylinder 505.

[0035] Optionally, the expansion cylinder assembly 1 and the cold storage assembly 2 form an expansion chamber 11; the integral base assembly 3 and the coupling assembly 4 form a first compression chamber 12; the linear compressor assembly 5 and the integral base assembly 3 form a second compression chamber 13; the expansion chamber 11 is connected to the first compression chamber 12; and the first compression chamber 12 is connected to the second compression chamber (13).

[0036] The present invention adopts a compact structure in which the cold finger assembly and the compressor are installed together on an integral base assembly and the cold finger assembly is radially embedded in the compressor, thereby facilitating installation and disassembly by users, reducing the dead volume of the refrigerator, and improving the refrigeration efficiency of the refrigerator.

[0037] Finally, it should be noted that those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A miniature compact integrated linear Stirling refrigerator, characterized in that: The invention comprises a cold finger assembly, an integral base assembly (3), a linear compressor assembly (5), a rear end cover (6), a fixing nut (7), a column spring (8), a spring seat (9), and a housing (10); the cold finger assembly comprises an expansion cylinder assembly (1), a cold storage assembly (2), and a coupling assembly (4); the cold storage assembly (2) is placed inside the expansion cylinder assembly (1); the front and rear ends of the integral base assembly (3) are respectively welded to the expansion cylinder assembly (1) and the rear end cover (6), and the upper and lower sides thereof are respectively welded to the housing (10), forming a closed space capable of bearing high pressure; The linear compressor assembly (5) is placed in a closed space and is welded and fixed to the integral base assembly (3); the coupling assembly (4) passes through the linear compressor assembly (5), one end of the coupling assembly (4) is connected to the expansion cylinder assembly (1), and the other end is connected to the spring seat (9), the column spring (8), and the fixing nut (7) in sequence; one end of the column spring (8) is fixed to the spiral groove of the spring seat (9), and the other end is fixed to the spiral groove of the fixing nut (7); the integral base assembly (3) includes a base (301), a valve core (302), a pressing screw The base (301) has a circular ring structure, a support frame (306) is provided inside the base (301), the support frame (306) is provided with a through hole, the central axis of the through hole coincides with the central axis of the circular ring of the base (301); the coupling assembly (4) is placed in the through hole, the shaft bushing (305) is placed between the support frame (306) and the coupling assembly (4), and the shaft bushing (305) is indirectly sealed with the support frame (306) and the coupling assembly (4); the support frame ( 306) A boss and a threaded inner hole are respectively provided at positions perpendicular to the central axis of the through hole, the two-core connector (304) is welded and fixed on the boss, the valve core (302) is placed in the inner hole and is compressed by a clamping screw (303); the expansion cylinder assembly (1) includes an expansion cylinder (101) and a cold head (102), and the cold head (102) is welded and fixed to one end of the expansion cylinder (101); the cold storage assembly (2) is placed in a cavity formed by the expansion cylinder (101) and the cold head (102), and the gap with the expansion cylinder (101) is sealed.

2. A miniature compact integrated linear Stirling refrigerator according to claim 1, characterized in that: The cold storage device assembly (2) comprises a cold storage device cold end cover (201), a cold storage device shell (202), a wire mesh (203), and a ball head seat (204); the cold storage device cold end cover (201) is bonded to the front end of the cold storage device shell (202), the wire mesh (203) is filled in the interior of the cold storage device shell (202), and the ball head seat (204) is bonded to the rear end of the cold storage device shell (202); through holes are provided in the middle and on both sides of the ball head seat (204), and the through holes are interconnected.

3. The miniature compact integrated linear Stirling refrigerator according to claim 2, characterized in that: The coupling assembly (4) comprises a standard shaft (401), a ball head (402), and a ball head socket (403); the ball head (402) comprises an internal tapping thread, and the front end of the standard shaft (401) is connected to the ball head (402) via a thread; one side of the ball head socket (403) is connected to the ball head seat (204), and the other side is connected to the ball head (402); both sides of the ball head socket (403) are chamfered, and vent holes are provided at the chamfered edges, and the vent holes are communicated with the vent holes on both sides of the ball head seat (204).

4. The miniature compact integrated linear Stirling refrigerator according to claim 1, characterized in that: The linear compressor assembly (5) comprises a leaf spring assembly (501), a compression piston assembly (502), a magnetic steel assembly (503), an external magnetic circuit assembly (504), and an inner magnetic pole compressor cylinder (505); the compression piston assembly (502) passes through the leaf spring assembly (501) and is fixed by a nut; the magnetic steel assembly (503) is welded and fixed to both sides of the compression piston assembly (502); the inner magnetic pole compressor cylinder (505) is placed between the compression piston assembly (502) and the magnetic steel assembly (503), and is indirectly sealed with the compression piston assembly (502); the external magnetic circuit assembly (504) is placed outside the magnetic steel assembly (503), and one end of the external magnetic circuit assembly (504) is welded and fixed to the leaf spring assembly (501).

5. The miniature compact integrated linear Stirling refrigerator according to claim 4, characterized in that: The linear compressor assembly (5) has a symmetrical structure with the coupling assembly (4) as the central axis; the coupling assembly (4) is placed at the inner hole formed by the inner magnetic pole compressor cylinder (505) which is symmetrical in the upper and lower directions.

6. The miniature compact integrated linear Stirling refrigerator according to claim 4, characterized in that: The linear compressor assembly (5) has a symmetrical structure with the compression piston assembly (502) as the central axis.

7. The miniature compact integrated linear Stirling refrigerator according to claim 1, characterized in that: The expansion cylinder assembly (1) and the cold storage assembly (2) form an expansion chamber (11); the integral base assembly (3) and the coupling assembly (4) form a first compression chamber (12); the linear compressor assembly (5) and the integral base assembly (3) form a second compression chamber (13); the expansion chamber (11) is connected to the first compression chamber (12); and the first compression chamber (12) is connected to the second compression chamber (13).

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