A cold head structure and a refrigeration structure using the same

Abstract

The application discloses a cold head structure, which comprises a cold head shell, a hollowed-out fixed piston cylinder body is arranged at the bottom of the cold head shell, a passage is arranged between the piston cylinder body and the cold head shell, the top of the piston cylinder body is an open structure and is internally provided with an expansion piston head which is not in contact, the top of the expansion piston head is sealed, at least two expansion piston springs are connected to the lower side in parallel, the expansion piston springs are fixed to the inner wall of the piston cylinder body, a cold head connecting rod is fixed in the middle of the expansion piston springs, the cold head connecting rod is connected to the expansion piston head at the top and is fixed to the hollowed-out connecting part at the bottom of the cold head shell. The reciprocating movement of the piston is realized through the fixing of the connecting rod and the reciprocating of the spring, which is different from the traditional reciprocating movement of the connecting rod to push the piston to move, the overall structure is independent, the refrigeration effect is ensured, the volume is reduced, and the integration is higher.

Description

TECHNICAL FIELD

[0001] The application relates to the field of refrigeration, in particular to a cold head structure. BACKGROUND

[0002] Unlike the traditional cycle theory, the cycle theory adopted by the thermoacoustic compressor is a more efficient thermodynamic theory, and with the continuous development of new technologies, the thermoacoustic compressor is also more and more valued by technicians.

[0003] In the existing structure of the thermoacoustic refrigerator, the expansion piston is coaxially arranged with the piston rod of the power piston, and the gas suspension state is formed to reduce friction, so that the high-efficiency operation of the current thermoacoustic refrigeration structure is formed.

[0004] Moreover, the expansion piston part and the power piston part of the traditional thermoacoustic compressor form a connected whole, and the spring structure is arranged at the bottom of the compressor.

[0005] However, friction is difficult to avoid, and therefore a new refrigeration structure needs to be developed to separate the two parts. SUMMARY

[0006] To solve the above problems, the application provides a cold head structure, which realizes the reciprocating motion of the piston through the fixation of the connecting rod and the reciprocating motion of the spring, is different from the traditional reciprocating motion of the connecting rod to push the piston to move, and has an independent overall structure, so that the refrigeration effect is ensured, the volume is further reduced, and the integration is higher.

[0007] To achieve the above object, the technical scheme adopted by the application is as follows: a cold head structure, comprising a cold head shell, a piston cylinder body is fixedly arranged in the bottom of the cold head shell in a hollow connection mode, a passage is arranged between the piston cylinder body and the cold head shell, the top of the piston cylinder body is an open structure and is not in contact with the inside, an expansion piston head is arranged in the inside, the top of the expansion piston head is sealed, at least two expansion piston springs are connected in parallel on the lower side of the expansion piston head, the expansion piston springs are fixed to the inner wall of the piston cylinder body, a cold head connecting rod is fixed in the middle of the expansion piston springs, the cold head connecting rod is connected to the expansion piston head at the top and fixed to the hollow connection part on the bottom side of the cold head shell at the bottom center position.

[0008] Further, the gap of the passage is 5mm.

[0009] Further, the cold head shell is provided with heat dissipation fins on the lower side and a cold guide end on the top side.

[0010] Based on the cold head structure, a refrigeration structure is further developed.

[0011] The refrigeration structure is connected to a mover structure through the connecting end on the bottom side of the cold head structure, and the mover structure is provided with the cold head structure on one side or both sides.

[0012] Further, the mover structure comprises a mover shell, a fixed support is arranged in the inner side of the mover shell, a power cavity is arranged in the middle of the fixed support, a power assembly is arranged in the power cavity, the power assembly is connected with a power piston head on one side or both sides of a connecting rod, the power piston head is arranged in a cylinder sleeve fixed in the inner side of the fixed support, and the connecting rod is fixed with a reed at the bottom side of the cylinder sleeve, and the mover shell is provided with a connecting opening on one side or both sides.

[0013] Further, the power assembly comprises a coil arranged in the power cavity, and further comprises a magnet arranged in the coil and connected by the connecting rod.

[0014] Further, the magnet reciprocates in the power cavity.

[0015] Further, the connecting rod is connected with the power piston head on both sides.

[0016] Further, the power piston head and the connecting rod are fixed by bolts.

[0017] Further, the connecting rod is fixed with the reed in both directions.

[0018] Further, the connecting opening is arranged on both sides as an external fixed end.

[0019] Further, 3.5MPa helium is arranged in the mover shell.

[0020] In summary, the present application has the following advantages:

[0021] The cold head structure provided by the present application realizes the reciprocating movement of the piston through the fixing of the connecting rod and the reciprocating movement of the elastic sheet, which is different from the traditional reciprocating movement of the connecting rod to push the piston to move, and the overall structure is independent, which can not only ensure the refrigeration effect but also reduce the volume and improve the integration.

[0022] In the refrigeration structure, the cold head of the thermoacoustic compressor and the mover part are independent, and the double-head cold end effect can be achieved, without being coaxial with the shaft of the expansion piston, so that the volume is small, the double-head refrigeration is achieved, the overall performance is better, and the selectivity is high. DETAILED DESCRIPTION

[0023] Figure 1 is a schematic view of a cold head structure;

[0024] Figure 2 is a schematic view of a refrigeration structure

[0025] Figure 3 is a schematic view of a mover structure. DETAILED DESCRIPTION

[0026] The present application will be further described below in combination with the drawings and embodiments:

[0027] Embodiment 1:

[0028] A cold head structure, as shown in Figure 1 The cold head structure comprises a cold head shell 1-1, a piston cylinder 1-2 fixedly connected in the hollowed part at the bottom of the cold head shell 1-1, and a passage 1-4 between the piston cylinder 1-2 and the cold head shell 1-1, which serves as a gas passage with a gap of 5 mm.

[0029] It is worth noting that the hollowed part at the connecting end of the piston cylinder 1-2 and the cold head shell 1-1 is a lateral hollowed part, which forms a lateral flow passage for the gas.

[0030] Continuing to refer to the accompanying Figure 1 The top of the piston cylinder 1-2 is an open structure without internal contact, and is provided with an expansion piston head 1-5. The gap is smaller than that of the passage 1-4.

[0031] The gas passage forms a circulating effect of in-out.

[0032] The expansion piston head 1-5 is sealed at the top and is connected in parallel with at least two expansion piston springs 1-6 at the bottom, which are two in this embodiment. The expansion piston springs 1-6 are fixed to the inner wall of the piston cylinder, and a cold head connecting rod 1-7 is fixed in the center of the expansion piston springs 1-6. The cold head connecting rod 1-7 is connected to the expansion piston head at the top and is fixed to a hollowed connecting part 1-8 at the bottom side of the cold head shell 1-1 at the center position.

[0033] That is, the cold head connecting rod is fixed, and the piston is driven to push the flow of the gas by the power structure cooperating with the expansion piston springs, forming a reciprocating motion. Unlike the traditional structure in which the connecting rod drives the reciprocating motion, the length of the reciprocating contact is shorter, and the frictional effect is smaller, so that the refrigeration effect is more optimal.

[0034] Further, the cold head shell 1-1 is provided with a heat dissipation fin 1-9 at the bottom side, and a cold end 1-10 is provided at the top side, preferably made of red copper.

[0035] Embodiment 2:

[0036] This embodiment is a cold end structure, which is applied to the cold end structure in Embodiment 1.

[0037] Specifically, the cold end structure is connected to the mover structure 100 through the connecting end 1-11 at the bottom side. The mover structure 100 is provided with the cold end structure on one side or on both sides. In this embodiment, the cold end structure is provided on both sides.

[0038] Continuing to refer to the accompanying Figure 2 The mover structure comprises a mover shell 1, which is provided with a heat dissipation structure, which can be a heat dissipation fin, for heat dissipation of the mover structure.

[0039] The inner structure is provided with a fixed support 2 inside the mover shell 1, which is a support structure of the whole mover interior, and a power cavity 21 is arranged in the middle of the fixed support 2.

[0040] The power cavity 21 is provided with a power assembly 22, and the power assembly 22 is connected to the power piston head 3 on one side or on both sides through a through connecting rod 221.

[0041] In this embodiment, the connecting rod 221 is connected to the power piston head 3 on both sides, that is, a double-sided cold head can be formed, and double-sided refrigeration is realized.

[0042] Continue to refer to the accompanying drawings Figure 1 The power assembly 22 includes a coil 222 arranged in the power cavity 21, and further includes a magnet 223 arranged inside the coil 222 and connected through the connecting rod 221, and the magnet 223 reciprocates in the power cavity 21.

[0043] Therefore, the connecting rod 221 can reciprocate in the whole fixed support 2, specifically, the connecting rod 221 penetrates the through hole arranged on the upper and lower sides of the power cavity, and the inside of the power cavity is a power source, that is, the coil drives the magnet to move.

[0044] Under the driving of the connecting rod 221, the power piston head 3 arranged in the cylinder sleeve 4 fixed inside the fixed support 2 also moves, and the connecting rod 221 is fixed with the reed 5 on the bottom side of the cylinder sleeve 4, specifically, the center point is fixed, and the both sides are connected, so that the power piston head 3 connected on both sides reciprocates in the cylinder sleeve.

[0045] When arranged on one side, the side without the cylinder sleeve is also fixed with the reed 5, which is fixed on the fixed support, and is used for auxiliary positioning and reciprocating movement of the connecting rod, and the power shell is closed on this side.

[0046] It is worth noting that the power piston head 3 and the connecting rod 221 are fixed through the bolt 7.

[0047] Continue to refer to the accompanying drawings Figure 1 The mover shell 1 is provided with a connecting port 6 on one side or on both sides, which is provided on both sides in this embodiment, and is an external fixed end, which is used for connection with the cold head end, that is, the expansion piston end.

[0048] The whole mover shell is provided with 3.5MPa helium.

[0049] In the working mechanism of the structure, when the power piston head is driven by the coil to move towards the cold head, the reciprocating movement is realized in cooperation with the bidirectional reed, when the power piston head moves towards the cold head, the gas at the cold head part moves outward through upward, downward between the expansion piston and the cylinder body, to form a cycle, at this time, the expansion piston and the power piston head move relatively.

[0050] Therefore, the refrigeration structure has small overall noise, the mover part is separated, the double cold end effect is formed, the refrigeration structure does not need to be coaxially arranged with the shaft rod of the expansion piston, and the overall performance is better

[0051] In summary, the cold head structure of the scheme is fixed through the connecting rod, reciprocating motion of the piston is realized through the reciprocating of the elastic sheet, the overall structure is independent, the refrigeration effect is guaranteed, the volume is reduced, and the integration is higher.

[0052] In the refrigeration structure, the cold head of the thermoacoustic compressor is separated from the mover part, the double cold end effect is formed, the refrigeration structure does not need to be coaxially arranged with the shaft rod of the expansion piston, the volume is small, double refrigeration is formed, the overall performance is better, and the selectivity is high.

[0053] The above-mentioned embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent transformation or modification according to the spirit and essence of the present application should be covered within the protection scope of the present application.

[0054] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection, it can be mechanical connection, or electrical connection, it can be direct connection, or indirect connection through intermediate medium, or internal connection of two elements.

[0055] For those skilled in the art, the specific meanings of the above-mentioned terms in the present application can be understood according to specific circumstances.

[0056] It should be understood that the above-mentioned embodiments are only exemplary and not limiting, and those skilled in the art can make various obvious or equivalent modifications or replacements to the above-mentioned details without departing from the basic principles of the present application, which will be included in the scope of claims of the present application.

Claims

1. A cold head structure, characterized by: The cold head shell (1-1) is hollowed out at the bottom and connected to the fixed piston cylinder (1-2), and a passage (1-4) is arranged between the piston cylinder (1-2) and the cold head shell (1-1), the top of the piston cylinder (1-2) is an open structure and is not in contact with the inside, and the expansion piston head (1-5) is arranged inside, the top of the expansion piston head (1-5) is sealed, and the lower side is connected to at least two expansion piston springs (1-6), the expansion piston spring (1-6) is fixed inside the piston cylinder (1-2), and the cold head connecting rod (1-7) is fixed in the center of the expansion piston spring (1-6), and the top of the cold head connecting rod (1-7) is connected to the expansion piston head (1-5), and the bottom center of the cold head shell (1-1) is fixed to the hollow connection part (1-8) on the bottom side.

2. The cold head structure of claim 1, wherein: The gap of the passage (1-4) is 5mm.

3. The cold head structure of claim 1, wherein: The cold head shell (1-1) is provided with a heat dissipation fin (1-9) on the lower side and a cold end (1-10) on the top side.

4. A refrigeration structure characterized by: The cold head structure according to any one of claims 1-3 is connected to the mover structure (100) through the connecting end (1-11) on the bottom side, and the mover structure (100) is provided with the cold head structure on one side or both sides.

5. A refrigeration structure according to claim 4, wherein: The mover structure (100) includes a mover shell (1), a fixed support (2) is arranged on the inner side of the mover shell (1), a power cavity (21) is arranged in the center of the fixed support (2), a power assembly (22) is arranged in the power cavity (21), a connecting rod (221) of the power assembly (22) is connected to a power piston head (3) on one side or both sides, the power piston head (3) is arranged in a cylinder sleeve (4) fixed on the inner side of the fixed support (2), and the connecting rod (221) is fixed to a spring sheet (5) on the bottom side of the cylinder sleeve (4), and the mover shell (1) is provided with a connecting port (6) on one side or both sides and fixed to the connecting end (1-11).

6. A refrigeration structure according to claim 5, wherein: The power assembly (22) includes a coil (222) arranged in the power cavity (21), and further includes a magnet (223) arranged inside the coil (222) and connected by the connecting rod (221).

7. A refrigeration structure according to claim 5, wherein: The power piston head (3) and the connecting rod (221) are fixed by a bolt (7).

8. A refrigeration structure according to claim 7, characterized in that: The connecting rod (221) is connected to the power piston head (3) on both sides.

9. A refrigeration structure according to claim 8, characterized in that: The connecting rod (221) is fixed to the spring sheet (5) in both directions.

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