Transmission mechanism of Stirling cryocooler and Stirling cryocooler

Abstract

The utility model relates to the field of Stirling cryocoolers, and discloses a transmission mechanism of a Stirling cryocooler, which comprises a machine body, a crankshaft, a permanent magnet rotor, an isolation sleeve and a driving module, the isolation sleeve is connected to the side face of the machine body. One end of the crankshaft is rotationally connected with the machine body, and the other end is rotationally connected with the isolation sleeve; the permanent magnet rotor is arranged on the crankshaft and located in the isolation sleeve. The driving module and the end face of the permanent magnet rotor drive the permanent magnet rotor to rotate in a magnetic coupling mode so as to drive the crankshaft to rotate. The transmission mechanism can reduce vibration of the crankshaft, reduce abrasion and prolong the service life of the crankshaft. Meanwhile, the utility model further provides the Stirling cryocooler.

Description

Technical Field

[0001] The utility model relates to the field of Stirling refrigerators, in particular to a transmission mechanism of a Stirling refrigerator and a Stirling refrigerator. Background Art

[0002] At present, the most widely used field of Stirling refrigerators is the field of infrared detectors. In order to achieve the miniaturization of Stirling refrigerators, an integrated design is generally adopted, that is, the compression mechanism (compression piston, compression cylinder) and the expansion refrigeration mechanism (displacer, regenerator, expansion cylinder, cold end heat exchanger) are integrated into one, and the compression mechanism and the expansion refrigeration mechanism are coupled with the rotating crankshaft driven by the motor to form a Stirling refrigerator.

[0003] The traditional rotary Stirling refrigerator is driven by a motor directly connected to the crankshaft. When the motor is directly driven, the crankshaft is longer, which produces greater vibration and wear during operation. In addition, the motor shaft and the crankshaft have to be installed with higher precision, which increases the difficulty of installation and debugging.

[0004] Therefore, improving the driving mode of the rotary Stirling refrigerator is an issue that needs to be urgently addressed by technicians in the industry.

[0005] CN201310738087 discloses a magnetic transmission piston refrigeration compressor, comprising a compressor, a magnetic transmission machine, an outer cover and a motor; the compressor comprises a body, a piston, a connecting rod, a crankshaft and a cylinder sleeve; the magnetic transmission machine comprises an inner rotor, an outer rotor, a spacer sleeve, an inner magnet and an outer magnet, the inner rotor is embedded with an inner magnet along its outer circumferential surface, the outer rotor is embedded with an outer magnet along its inner circumferential surface, the inner rotor is embedded in the inner cavity of the outer rotor and is separated by a spacer sleeve, and the spacer sleeve is fixed on the compressor body; the inner rotor of the magnetic transmission device is coaxially connected to the crankshaft, and the spacer sleeve seals the inner rotor and the crankshaft to form a sealed cavity; the outer rotor of the magnetic transmission device is coaxially connected to the output shaft of the motor, and the outer cover is covered outside the transmission device and installed on the compressor body and the front end seat of the motor. The crankshaft of the magnetic transmission piston refrigeration compressor is rotatably connected to the body, and the inner rotor is arranged on the end of the crankshaft extending out of the body, in this way, the crankshaft extends out of the body due to the need to connect the inner rotor. Since the crankshaft is relatively long and has a free end that is not fixed, large vibrations may occur when the crankshaft rotates, causing the crankshaft to wear faster.

[0006] The technical problem to be solved by the utility model is: how to reduce the vibration and wear of the crankshaft in the Stirling refrigerator. Utility Model Content

[0007] The main purpose of the utility model is to provide a Stirling refrigerator based on magnetic coupling transmission, in which the two ends of the crankshaft are rotatably connected to the isolation sleeve and the machine body respectively, the permanent magnet rotor is connected to the crankshaft and is located in the isolation sleeve, and the crankshaft is driven to rotate by adopting magnetic coupling, so that the crankshaft is more stable during rotation and wear is reduced.

[0008] At the same time, a Stirling refrigerator is also provided.

[0009] To achieve the above objectives, the technical solutions adopted in this application are:

[0010] A transmission mechanism of a Stirling refrigerator comprises a machine body, a crankshaft, a permanent magnet rotor, an isolating sleeve, and a driving module; the isolating sleeve is connected to the side of the machine body; one end of the crankshaft is rotatably connected to the machine body, and the other end is rotatably connected to the isolating sleeve; the permanent magnet rotor is arranged on the crankshaft and is located in the isolating sleeve; the driving module drives the permanent magnet rotor to rotate through magnetic coupling with the end surface of the permanent magnet rotor, thereby driving the crankshaft to rotate.

[0011] Preferably, the isolation sleeve is provided with a first cavity for accommodating the permanent magnet rotor, and one side of the first cavity is a first opening; and the side of the isolation sleeve close to the first opening is connected to the machine body.

[0012] Preferably, the driving module comprises a conductor rotor and a motor; the conductor rotor is connected to the power output end of the motor; the conductor rotor and the permanent magnet rotor are coaxially arranged; the conductor rotor and the permanent magnet rotor are respectively located on both sides of the isolation sleeve.

[0013] Preferably, magnets are provided on the end surfaces of the conductor rotor and the permanent magnet rotor that are close to each other; and the magnets are arranged in a NSNS cross pattern.

[0014] Preferably, the driving module also includes a motor base; the motor base is provided with a second cavity for accommodating a conductor rotor and an isolation sleeve; one side of the second cavity is a second opening; a side of the motor base close to the second opening is connected to a side of the machine body close to the isolation sleeve; and the motor is arranged on the side of the motor base.

[0015] At the same time, a Stirling refrigerator is also provided, comprising a transmission mechanism and a refrigeration unit of any of the Stirling refrigerators described above; the refrigeration unit comprises a compression module and an expansion module; the compression module and the expansion module are both connected to the crankshaft; a first through hole for accommodating the compression module and a second through hole for accommodating the expansion module are provided in the body.

[0016] Preferably, the expansion module comprises an expansion rod and an expansion plunger; one end of the expansion rod is rotationally connected to the crankshaft, and the other end is rotationally connected to the expansion plunger; the expansion plunger is located in the second through hole.

[0017] Preferably, the crankshaft is provided with a balancing block; the balancing block is located on a side of the refrigeration unit close to the permanent magnet rotor and is located inside the machine body.

[0018] Compared with the prior art, this solution has the following beneficial effects:

[0019] The Stirling refrigerator in this case drives the crankshaft to rotate by means of magnetic coupling. Moreover, one end of the crankshaft is rotatably connected to the machine body, and the other end is rotatably connected to the isolation sleeve, thereby replacing the two ends of the crankshaft being rotatably connected to the machine body. When the crankshaft rotates, both ends of the crankshaft are supported, and the permanent magnet rotor and the refrigeration unit are located between the two ends of the crankshaft, so that the crankshaft rotates stably. Secondly, the planar magnetic coupling drive method, combined with the crankshaft installation method, can shorten the length of the crankshaft, thereby making the crankshaft rotation more stable, and at the same time, it is convenient for the staff to assemble and debug. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional view of the Stirling refrigerator of the present utility model;

[0021] Figure 2 It is a structural schematic diagram of the Stirling refrigerator (without the body) of the utility model;

[0022] Figure 3 It is a structural schematic diagram of the body of the utility model.

[0023] Among them: body 1; crankshaft 2; refrigeration unit 3; permanent magnet rotor 4; isolation sleeve 5; drive module 6; first cavity 51; conductor rotor 61; motor 62; motor base 63; second cavity 631; compression module 31; expansion module 32; expansion connecting rod 321; expansion plunger 322; balance block 21; first through hole 11; second through hole 12; bearing 7. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. The components of the present application implemented as described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Example 1

[0026] refer to Figure 1-3A transmission mechanism of a Stirling refrigerator comprises a body 1, a crankshaft 2, a permanent magnet rotor 4, an isolation sleeve 5, and a drive module 6; the isolation sleeve 5 is connected to the side of the body 1; one end of the crankshaft 2 is rotatably connected to the body 1, and the other end is rotatably connected to the isolation sleeve 5; the permanent magnet rotor 4 is arranged on the crankshaft 2 and is located in the isolation sleeve 5; the drive module 6 drives the permanent magnet rotor 4 to rotate through magnetic coupling with the end surface of the permanent magnet rotor 4, thereby driving the crankshaft 2 to rotate.

[0027] In this embodiment, the isolation sleeve 5 is installed on one side of the body 1, the crankshaft 2 is placed in the body 1, and one end of the crankshaft 2 is rotatably connected to the body 1 through the bearing 7, and the other end is rotatably connected to the isolation sleeve 5 through the bearing 7, and the permanent magnet rotor 4 is arranged in the isolation sleeve 5. The overall arrangement on the crankshaft 2 is the bearing 7, the permanent magnet rotor 4, the external refrigeration unit 3, and the bearing 7 in sequence, so that both ends of the crankshaft 2 are supported and the magnetic coupling transmission mode can be realized. In this way, since the crankshaft 2 only needs one bearing 7 to support it in the body 1, the length of the crankshaft 2 is shortened, and since the stress points of the crankshaft 2 are more in the body 1, the deflection of the crankshaft 2 is reduced, so that when the crankshaft 2 rotates, the vibration and wear of the crankshaft 2 are reduced, and the service life of the crankshaft 2 is increased.

[0028] The drive module 6 is installed on the side of the body 1 close to the isolation sleeve 5. The drive module 6 has no direct contact with the crankshaft 2 and is transmitted through planar magnetic coupling, which reduces the installation accuracy of the drive module 6 and the crankshaft 2 and reduces the labor intensity of the staff.

[0029] Preferably, the isolation sleeve 5 is provided with a first cavity 51 for accommodating the permanent magnet rotor 4 , and one side of the first cavity 51 is a first opening; and the side of the isolation sleeve 5 close to the first opening is connected to the machine body 1 .

[0030] In this embodiment, a groove for mounting the bearing 7 is provided on the side wall of the spacer sleeve 5. When the crankshaft 2 is rotatably connected to the spacer sleeve 5, the spacer sleeve 5 will not pass through the spacer sleeve 5, but is only connected to the bearing 7, so that the spacer sleeve 5 is rotatably connected to the crankshaft 2, and the sealing effect of the spacer sleeve 5 can be ensured to prevent the helium in the body 1 from leaking. Moreover, the permanent magnet rotor 4 is within the two supporting points of the crankshaft 2, which can keep the crankshaft 2 rotating smoothly.

[0031] Preferably, the driving module 6 comprises a conductor rotor 61 and a motor 62 ; the conductor rotor 61 is connected to the power output end of the motor 62 ; the conductor rotor 61 and the permanent magnet rotor 4 are coaxially arranged; the conductor rotor 61 and the permanent magnet rotor 4 are respectively located on both sides of the isolation sleeve 5 .

[0032] In this embodiment, the motor 62 is fixed on a side of the machine body 1 close to the permanent magnet rotor 4, and the conductor rotor 61 is outside the isolation sleeve 5, driving the permanent magnet rotor 4 to rotate and the crankshaft 2 to rotate through magnetic coupling.

[0033] Preferably, magnets are provided on the end surfaces of the conductor rotor 61 and the permanent magnet rotor 4 that are close to each other; and the magnets are arranged in a NSNS cross pattern.

[0034] In this embodiment, the conductor rotor 61 and the permanent magnet rotor 4 are driven by planar magnetic coupling. For the specific transmission principle, please refer to https: / / baike.baidu.com / item / %E7%A3%81%E6%80%A7%E8%81%94%E8%BD%B4%E5%99%A8 / 4108830?fr=ge_ala.

[0035] Preferably, the driving module 6 also includes a motor base 63; the motor base 63 is provided with a second cavity 631 for accommodating the conductor rotor 61 and the isolation sleeve 5; one side of the second cavity 631 is a second opening; the side of the motor base 63 close to the second opening is connected to the side of the body 1 close to the isolation sleeve 5; the motor 62 is arranged on the side of the motor base 63.

[0036] In this embodiment, the motor 62 is fixed to the machine body 1 through the motor base 63, and the power output end of the motor 62 passes through the motor base 63 and is fixedly connected to the conductor rotor 61. The conductor rotor 61 and the isolation sleeve 5 are placed in the second cavity 631. The motor base 63 can prevent external water, powder, etc. from entering the conductor rotor 61 and the isolation sleeve 5 to prevent the magnet on the conductor rotor 61 from being affected.

[0037] Example 2

[0038] refer to Figure 1-3 A Stirling refrigerator comprises a transmission mechanism and a refrigeration unit 3 of any of the above-mentioned Stirling refrigerators; the refrigeration unit 3 comprises a compression module 31 and an expansion module 32; the compression module 31 and the expansion module 32 are both connected to a crankshaft 2; a first through hole 11 for accommodating the compression module 31 and a second through hole 12 for accommodating the expansion module 32 are provided in the body 1.

[0039] In this embodiment, the overall arrangement on the crankshaft 2 is the bearing 7, the permanent magnet rotor 4, the expansion module 32, the compression module 31, and the bearing 7. The motor 62 drives the conductor rotor 61 to rotate, and the conductor rotor 61 and the permanent magnet rotor 4 drive the permanent magnet rotor 4 to rotate through magnetic coupling, and the permanent magnet rotor 4 drives the crankshaft 2 to rotate, and the crankshaft 2 drives the compression module 31 and the expansion module 32 to reciprocate on the first through hole 11 and the second through hole 12 respectively, and refrigeration is performed on the expansion module 32 through the Stirling cycle principle.

[0040] Preferably, the expansion module 32 includes an expansion connecting rod 321 and an expansion plunger 322 ; one end of the expansion connecting rod 321 is rotationally connected to the crankshaft 2 , and the other end is rotationally connected to the expansion plunger 322 ; the expansion plunger 322 is located in the second through hole 12 .

[0041] In this embodiment, an eccentric wheel is provided on the crankshaft 2, one end of the expansion connecting rod 321 is rotatably connected to the eccentric wheel on the crankshaft 2, and the other end is rotatably connected to the expansion plunger 322, and the expansion connecting rod 321 drives the expansion plunger 322 to reciprocate in the second through hole 12 through the rotation of the crankshaft 2. The structure of the compression module 31 is substantially the same as that of the expansion module 32.

[0042] Preferably, the crankshaft 2 is provided with a balancing block 21 ; the balancing block 21 is located on a side of the refrigeration unit 3 close to the permanent magnet rotor 4 and is located inside the machine body 1 .

[0043] In this embodiment, the balancing weight 21 is disposed on the crankshaft 2, located in the machine body 1, and between the refrigeration unit 3 and the permanent magnet rotor 4. The balancing weight 21 is used to balance the rotational inertia force of the crankshaft 2.

[0044] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A transmission mechanism of a Stirling refrigerator, comprising a body, a crankshaft, a permanent magnet rotor, a spacer sleeve, and a drive module; characterized in that: The isolation sleeve is connected to the side of the machine body; one end of the crankshaft is rotatably connected to the machine body, and the other end is rotatably connected to the isolation sleeve; the permanent magnet rotor is arranged on the crankshaft and is located in the isolation sleeve; the drive module and the end face of the permanent magnet rotor drive the permanent magnet rotor to rotate through magnetic coupling, thereby driving the crankshaft to rotate.

2. The transmission mechanism of the Stirling refrigerator according to claim 1, characterized in that: The isolation sleeve is provided with a first cavity for accommodating the permanent magnet rotor, and one side of the first cavity is a first opening; and the side of the isolation sleeve close to the first opening is connected to the machine body.

3. The transmission mechanism of the Stirling refrigerator according to claim 1, characterized in that: The driving module comprises a conductor rotor and a motor; the conductor rotor is connected to the power output end of the motor; the conductor rotor and the permanent magnet rotor are coaxially arranged; the conductor rotor and the permanent magnet rotor are respectively located on two sides of the isolation sleeve.

4. The transmission mechanism of the Stirling refrigerator according to claim 3, characterized in that: The end surfaces of the conductor rotor and the permanent magnet rotor that are close to each other are both provided with magnets; and the magnets are arranged in a NSNS cross pattern.

5. The transmission mechanism of the Stirling refrigerator according to claim 3, characterized in that: The driving module also includes a motor base; the motor base is provided with a second cavity for accommodating a conductor rotor and an isolation sleeve; one side of the second cavity is a second opening; a side of the motor base close to the second opening is connected to a side of the body close to the isolation sleeve; and the motor is arranged on the side of the motor base.

6. A Stirling refrigerator, characterized in that: It comprises a transmission mechanism and a refrigeration unit of a Stirling refrigerator as described in any one of claims 1 to 5; the refrigeration unit comprises a compression module and an expansion module; the compression module and the expansion module are both connected to a crankshaft; a first through hole for accommodating the compression module and a second through hole for accommodating the expansion module are provided in the body.

7. The Stirling refrigerator according to claim 6, characterized in that: The expansion module comprises an expansion connecting rod and an expansion plunger; one end of the expansion connecting rod is rotationally connected to the crankshaft, and the other end is rotationally connected to the expansion plunger; the expansion plunger is located in the second through hole.

8. The Stirling refrigerator according to claim 6, characterized in that: The crankshaft is provided with a balancing block; the balancing block is located on a side of the refrigeration unit close to the permanent magnet rotor and is located inside the machine body.

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