Vibration reduction corrugated pipe assembly and refrigerating machine

Abstract

The vibration reduction corrugated pipe assembly comprises a corrugated pipe main body, a corrugated pipe upper connecting flange, a corrugated pipe lower connecting flange and a telescopic supporting assembly, and the two ends of the corrugated pipe main body are connected with the corrugated pipe upper connecting flange and the corrugated pipe lower connecting flange correspondingly; the corrugated pipe upper connecting flange is connected with the mounting flange of the cold head, the corrugated pipe lower connecting flange is connected with the normal-temperature cold disc, and the telescopic supporting assembly is directly or indirectly connected with the cold head and the normal-temperature cold disc. Through the corrugated pipe upper connecting flange and the corrugated pipe lower connecting flange, compared with an existing vibration reduction assembly, a secondary support can be omitted, the structure is more compact, the weight of the whole machine can be reduced under the same condition, and the occupied area can be reduced. In addition, the cold head can be supported through the telescopic supporting assembly, the corrugated pipe body can be conveniently adjusted to be in a natural extension state, and therefore the service life of the corrugated pipe body can be prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerators, and particularly relates to a vibration damping bellows assembly and a refrigerator. Background Art

[0002] For a superconducting quantum computer to operate properly, a prerequisite is to provide it with a stable and quiet low-temperature environment. Currently, the device commonly used to provide this low-temperature environment is a dilution refrigerator, and a pulse tube refrigerator is the most commonly used pre-cooling device on the dilution refrigerator.

[0003] However, the pulse tube refrigerator generates vibrations during operation, and these vibrations will gradually conduct downwards along the dilution refrigerator to the lowest-layer quantum chip installation area, thereby affecting the normal and stable operation of the quantum chip.

[0004] In the prior art, the vibration damping of the pulse tube refrigerator is achieved through a bellows. The connection method is mainly as follows: a normal-temperature flange is installed at the top of the cryostat, and it is installed on the top bracket of the secondary bracket through the bellows. When the two ends of the bellows are connected to the top bracket of the secondary bracket and the normal-temperature flange, they are welded. In this way, the bellows mechanically isolates the bracket of the cryostat and the normal-temperature flange, so that the vibration will not be transmitted down to the cryostat, and at the same time, a sealed space is formed with the components under the normal-temperature cold plate of the cryostat. However, this vibration damping structure has the following problems:

[0005] 1. The vibration damping structure introduces a secondary bracket, increasing the volume of the structure and occupying more installation space under the same conditions;

[0006] 2. Since the radial stiffness of the bellows is very small compared to the vertical stiffness, the attenuation of the radial vibration generated by the pulse tube refrigerator is very poor, and the radial vibration cannot be effectively suppressed, causing additional yaw or shear of the structure. Eventually, the noise generated by the vibration is coupled into the quantum chip noise. In addition, the additional vibration will also increase the difficulty of the dilution refrigerator to achieve temperature control at the 10 mK level, making it more difficult to ensure the extremely low-temperature environment required for the normal operation of the quantum chip;

[0007] 3. Due to the shearing effect of the radial vibration on the bellows, it is easy to cause fatigue failure of the connection surfaces at both ends of the bellows, reducing the service life of the bellows. In addition, the welding connection method is not conducive to later replacement and maintenance.

[0008] Therefore, how to improve the vibration damping effect of the refrigerator is a technical problem that those skilled in the art need to solve at present. Summary of the Invention

[0009] An object of the present invention is to provide a vibration damping bellows assembly that can effectively improve its vibration damping effect, and another object is to provide a refrigerator including the above vibration damping bellows assembly.

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] A vibration damping bellows assembly, comprising:

[0012] A bellows main body, an upper connecting flange of the bellows and a lower connecting flange of the bellows, both ends of the bellows main body are respectively connected to the upper connecting flange of the bellows and the lower connecting flange of the bellows, the upper connecting flange of the bellows is used for connecting with the mounting flange of the cold head, and the lower connecting flange of the bellows is used for connecting with the normal temperature cold plate;

[0013] A telescopic support assembly, the telescopic support assembly is directly or indirectly connected to the cold head and the normal temperature cold plate respectively.

[0014] Preferably, the telescopic support assembly is an air spring assembly, and both ends of the air spring assembly are respectively connected to the upper connecting flange of the bellows and the lower connecting flange of the bellows.

[0015] Preferably, the air spring assembly includes an air spring main body, an upper air spring plate and a lower air spring plate, both ends of the air spring main body are respectively connected to the upper air spring plate and the lower air spring plate, the upper air spring plate is connected to the upper connecting flange of the bellows, and the lower air spring plate is connected to the lower connecting flange of the bellows.

[0016] Preferably, the air spring assembly further includes an air spring adjusting rod and an adjusting nut, the mounting flange and the upper connecting flange of the bellows are provided with mounting holes for the air spring adjusting rod to pass through, the lower end of the air spring adjusting rod is connected to the upper air spring plate, and the adjusting nut is threadedly connected to the upper end of the air spring adjusting rod.

[0017] Preferably, the upper air spring plate is snap-connected to the upper connecting flange of the bellows, and the lower air spring plate is snap-connected to the lower connecting flange of the bellows.

[0018] Preferably, wedge-shaped grooves are respectively provided on the upper end surface of the upper air spring plate and the lower end surface of the lower air spring plate, and wedge-shaped bosses that are mutually matched with the wedge-shaped grooves are respectively provided on the lower end surface of the upper connecting flange of the bellows and the upper end surface of the lower connecting flange of the bellows.

[0019] Preferably, a counterweight ring is provided at the upper end of the mounting flange.

[0020] Preferably, the counterweight ring is magnetically adsorbed on the upper end surface of the mounting flange.

[0021] Preferably, multiple groups of the air spring assemblies are provided between the upper connecting flange of the bellows and the lower connecting flange of the bellows and are evenly distributed along the circumferential direction.

[0022] Preferably, the telescopic support assembly includes a telescopic support rod and a radial damping element. One end of the telescopic support rod is connected to the cold head, the radial damping element is connected to the normal temperature cold plate, the other end of the telescopic support rod is hinged to the radial damping element, and the axis of the telescopic support rod is inclined relative to the axis of the cold head.

[0023] Preferably, a groove for accommodating the lower connecting flange of the bellows is provided at the upper end of the normal temperature cold plate.

[0024] A refrigerator includes the vibration damping bellows assembly described in any one of the above.

[0025] Compared with the prior art, the above technical solution has the following advantages:

[0026] 1. The bellows main body is connected to the cold head and the normal temperature cold plate through the upper connecting flange and the lower connecting flange of the bellows. Compared with the existing vibration damping assembly, the secondary bracket can be omitted, so that the structure can be more compact, the weight of the whole machine can be reduced under the same conditions, and the floor area can be reduced.

[0027] 2. An air spring assembly is provided between the upper connecting flange and the lower connecting flange of the bellows. The air spring assembly has good vertical stiffness and radial stiffness. Vertically, it can support the cold head of the pulse tube refrigerator, avoiding the bellows main body directly supporting the cold head, thereby improving the service life of the bellows, and also enhancing the vertical vibration damping effect of the bellows body itself. Moreover, the air spring assembly also has a certain vibration damping effect vertically. The air spring assembly can also absorb the radial vibration transmitted by the cold head, thereby playing a radial damping role. After the radial vibration is absorbed by the air spring assembly, the direct shear action on the bellows main body by the radial vibration is avoided, further enhancing the service life of the bellows main body.

[0028] 3. A telescopic support rod and a radial damping element are provided between the cold head and the normal temperature cold plate. The telescopic support rod is inclined, which can not only play an axial and radial damping role, but also support the cold head. In addition, the radial damping element can play a radial damping role. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0030] Figure 1 It is a cross-sectional view of a vibration damping bellows assembly provided by a specific embodiment of the present invention;

[0031] Figure 2 A cross-sectional view of a shock-absorbing bellows assembly provided by another specific embodiment of the present invention;

[0032] Figure 3 A cross-sectional view of a shock-absorbing bellows assembly provided by a specific embodiment of the present invention, which has a telescopic support rod and a radial damping element.

[0033] The reference numerals are as follows:

[0034] 1 is the bellows main body, 2 is the upper connecting flange of the bellows, 3 is the lower connecting flange of the bellows, 4 is the cold head, 41 is the mounting flange, 5 is the normal temperature cold plate, 6 is the air spring assembly, 61 is the air spring main body, 62 is the upper end plate of the air spring, 63 is the lower end plate of the air spring, 7 is the air spring adjusting rod, 8 is the adjusting nut, 9 is the counterweight ring, 10 is the telescopic support rod, and 11 is the radial damping element. Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] Please refer to Figure 1 , a shock-absorbing bellows assembly provided by an embodiment of the present invention can be applied to a pulse tube refrigerator. The shock-absorbing bellows assembly includes: a bellows main body 1, an upper connecting flange 2 of the bellows, a lower connecting flange 3 of the bellows, and a telescopic support assembly. The two ends of the bellows main body 1 are respectively connected to the upper connecting flange 2 and the lower connecting flange 3 of the bellows. The upper connecting flange 2 of the bellows is connected to the mounting flange 41 of the cold head 4, and the lower connecting flange 3 of the bellows is connected to the normal temperature cold plate 5. The bellows main body 1 is connected to the cold head 4 and the normal temperature cold plate 5 through the upper connecting flange 2 and the lower connecting flange 3 of the bellows. Compared with the existing shock-absorbing assembly, the secondary bracket can be omitted, so that the structure can be made more compact, the weight of the whole machine can be reduced under the same conditions, and the floor area can be reduced. The telescopic support assembly is directly or indirectly connected to the cold head 4 and the normal temperature cold plate 5 respectively. The telescopic support assembly can support the cold head 4 so as to adjust the bellows main body 1 to the natural elongation state, so that the service life of the bellows main body 1 can be improved.

[0037] In some embodiments, the telescopic support assembly is an air spring assembly 6. The two ends of the air spring assembly 6 are respectively connected to the upper connection flange 2 of the bellows and the lower connection flange 3 of the bellows. The air spring assembly 6 has good vertical stiffness and radial stiffness. Vertically, it can support the cold head 4 of the pulse tube refrigerator, avoiding the bellows main body 1 directly supporting the cold head 4, thereby improving the service life of the bellows and enhancing the vertical vibration damping effect of the bellows body itself. Moreover, the air spring assembly 6 also has a certain vibration damping effect vertically, which can expand the vibration damping effect of the vibration damping bellows assembly. Radially, the air spring assembly 6 can also absorb the radial vibration transmitted by the cold head 4, thereby playing a role in radial vibration damping and solving the problem of poor radial vibration damping of a single bellows. After the radial vibration is absorbed by the air spring assembly 6, it avoids the direct shear action of the radial vibration on the bellows main body 1, further enhancing the service life of the bellows main body 1.

[0038] In some embodiments, the air spring assembly 6 includes an air spring main body 61, an air spring upper end plate 62, and an air spring lower end plate 63. The two ends of the air spring main body 61 are respectively connected to the air spring upper end plate 62 and the air spring lower end plate 63. The air spring upper end plate 62 is connected to the upper connection flange 2 of the bellows, and the air spring lower end plate 63 is connected to the lower connection flange 3 of the bellows. As Figure 1 shown, the upper surface of the air spring upper end plate 62 is in close contact with the lower end surface of the upper connection flange 2 of the bellows, and the lower end surface of the air spring lower end plate 63 is connected to the upper end surface of the lower connection flange 3 of the bellows through a wedge-shaped structure.

[0039] In some embodiments, the air spring assembly 6 further includes an air spring adjusting rod 7 and an adjusting nut 8. The mounting flange 41 and the upper connection flange 2 of the bellows are provided with mounting holes for the air spring adjusting rod 7 to pass through. The lower end of the air spring adjusting rod 7 is connected to the air spring upper end plate 62, and the adjusting nut 8 is threadedly connected to the upper end of the air spring adjusting rod 7. The initial height of the air spring main body 61 can be adjusted through the adjusting nut 8 to ensure that the bellows main body 1 is in a natural elongation state. Two adjusting nuts 8 can be connected to the upper end of the air spring adjusting rod 7 to play a role in preventing loosening. In addition, the air spring adjusting rod 7 and the adjusting nut 8 can also fix the upper connection flange 2 of the bellows. The lower connection flange 3 of the bellows can also be connected to the normal temperature cold plate 5 through bolts. That is, the connection methods of the upper connection flange of the bellows to the cold head 4 and the lower connection flange 3 of the bellows to the normal temperature cold plate 5 are both detachable connections, which can facilitate the disassembly, installation, and maintenance of the bellows.

[0040] In some embodiments, please refer to Figure 2, the upper end plate 62 of the air spring is snap - connected to the upper connection flange 2 of the bellows, and the lower end plate 63 of the air spring is snap - connected to the lower connection flange 3 of the bellows. Among them, wedge - shaped grooves are respectively provided on the upper end face of the upper end plate 62 of the air spring and the lower end face of the lower end plate 63 of the air spring, and wedge - shaped bosses that cooperate with the wedge - shaped grooves are respectively provided on the lower end face of the upper connection flange 2 of the bellows and the upper end face of the lower connection flange 3 of the bellows. The wedge - shaped connection structure can play a role in radially limiting the air spring assembly 6, thereby ensuring the connection stability of the air spring assembly 6.

[0041] In some embodiments, a counterweight ring 9 is provided at the upper end of the mounting flange 41. By using counterweight rings 9 of different masses, the initial height of the air spring main body 61 can be adjusted to ensure that the bellows is in a natural elongation state. The counterweight ring 9 can be magnetically adsorbed on the upper end face of the mounting flange 41. In addition, it can also be detachably connected to the upper end face of the mounting flange 41 by other means.

[0042] In some embodiments, multiple groups of air spring assemblies 6 evenly distributed in the circumferential direction are provided between the upper connection flange 2 of the bellows and the lower connection flange 3 of the bellows. For example, three air spring assemblies 6 can be distributed on the outer circumference of the bellows main body 1. In addition, other numbers of air spring assemblies 6 can also be provided, and the specific number can be selected according to actual needs.

[0043] In some embodiments, as Figure 3 shown, the telescopic support assembly includes a telescopic support rod 10 and a radial damping element 11. Specifically, three telescopic support rods 10 and radial dampings 11 evenly distributed in the circumferential direction can be provided to form a three - point support stable structure. One end of the telescopic support rod 10 is connected to the cold head 4, the radial damping element 11 is connected to the normal - temperature cold plate 5, the radial stiffness and damping of the radial damping element 11 can be designed according to actual radial vibration damping needs, the radial damping element 11 can adopt a composite damping steel plate, the other end of the telescopic support rod 10 is hinged to the radial damping element 11, and preferably a ball joint is used between them, which can adjust the assembly problems caused by small machining errors. The axis of the telescopic support rod 10 is inclined relative to the axis of the cold head 4, and the inclination angle can be selected according to actual needs.

[0044] In some embodiments, a groove for accommodating the lower connection flange 3 of the bellows is provided at the upper end of the normal - temperature cold plate 5. The groove can play a role in radially limiting the lower connection flange 3 of the bellows, thereby ensuring the position accuracy of the lower connection flange 3 of the bellows installed on the normal - temperature cold plate 5.

[0045] The embodiment of the present invention also provides a refrigerator, including the vibration - damping bellows assembly provided in any one of the above - mentioned embodiments. The refrigerator can be a pulse - tube refrigerator. For the beneficial effects of the refrigerator, reference can be made to the above - mentioned vibration - damping bellows assembly, and details are not described here again.

[0046] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0047] The above has introduced in detail a vibration damping bellows assembly and a refrigerator provided by the present invention. Specific examples are used herein to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A vibration damping bellows assembly, characterized in that, Comprising: A corrugated pipe main body (1), an upper connecting flange (2) of the corrugated pipe, and a lower connecting flange (3) of the corrugated pipe. The two ends of the corrugated pipe main body (1) are respectively connected to the upper connecting flange (2) of the corrugated pipe and the lower connecting flange (3) of the corrugated pipe. The upper connecting flange (2) of the corrugated pipe is used to connect with the mounting flange (41) of the cold head (4), and the lower connecting flange (3) of the corrugated pipe is used to connect with the normal temperature cold plate (5); A telescopic support assembly, which is directly or indirectly connected to the cold head (4) and the normal temperature cold plate (5) respectively.

2. The shock-absorbing corrugated pipe assembly according to claim 1, wherein, The telescopic support assembly is an air spring assembly (6), and the two ends of the air spring assembly (6) are respectively connected to the upper connecting flange (2) of the corrugated pipe and the lower connecting flange (3) of the corrugated pipe.

3. The shock-absorbing corrugated pipe assembly according to claim 2, wherein, The air spring assembly (6) includes an air spring main body (61), an upper air spring plate (62), and a lower air spring plate (63). The two ends of the air spring main body (61) are respectively connected to the upper air spring plate (62) and the lower air spring plate (63). The upper air spring plate (62) is connected to the upper connecting flange (2) of the corrugated pipe, and the lower air spring plate (63) is connected to the lower connecting flange (3) of the corrugated pipe.

4. The shock-absorbing corrugated pipe assembly according to claim 3, wherein, The air spring assembly (6) further includes an air spring adjusting rod (7) and an adjusting nut (8). The mounting flange (41) and the upper connecting flange (2) of the corrugated pipe are provided with mounting holes for the air spring adjusting rod (7) to pass through. The lower end of the air spring adjusting rod (7) is connected to the upper air spring plate (62), and the adjusting nut (8) is threadedly connected to the upper end of the air spring adjusting rod (7).

5. The shock-absorbing bellows assembly according to claim 3, characterized in that, The upper air spring plate (62) is snap-connected to the upper connecting flange (2) of the corrugated pipe, and the lower air spring plate (63) is snap-connected to the lower connecting flange (3) of the corrugated pipe.

6. The shock-absorbing bellows assembly according to claim 5, characterized in that, The upper end surface of the upper air spring plate (62) and the lower end surface of the lower air spring plate (63) are respectively provided with wedge-shaped grooves, and the lower end surface of the upper connecting flange (2) of the corrugated pipe and the upper end surface of the lower connecting flange (3) of the corrugated pipe are respectively provided with wedge-shaped bosses that cooperate with the wedge-shaped grooves.

7. The shock-absorbing bellows assembly according to claim 6, wherein, A counterweight ring (9) is provided at the upper end of the mounting flange (41).

8. The vibration damping bellows assembly according to claim 7, characterized in that, The counterweight ring (9) is magnetically adsorbed on the upper end surface of the mounting flange (41).

9. The shock-absorbing corrugated pipe assembly according to claim 2, wherein A plurality of groups of the air spring assemblies (6) evenly distributed in the circumferential direction are provided between the upper connecting flange (2) of the corrugated pipe and the lower connecting flange (3) of the corrugated pipe.

10. The shock-absorbing corrugated pipe assembly according to claim 1, characterized in that, The telescopic support assembly includes a telescopic support rod (10) and a radial damping element (11). One end of the telescopic support rod (10) is connected to the cold head (4), the radial damping element (11) is connected to the normal temperature cold plate (5), the other end of the telescopic support rod (10) is hinged to the radial damping element (11), and the axis of the telescopic support rod (10) is inclined with respect to the axis of the cold head (4).

11. The shock-absorbing corrugated pipe assembly according to claim 1, wherein, A groove for accommodating the lower connecting flange (3) of the corrugated pipe is provided at the upper end of the normal temperature cold plate (5).

12. A refrigerating machine, characterized in that, Comprising the shock-absorbing corrugated pipe assembly according to any one of claims 1 to 9.

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