Vibration reduction corrugated pipe assembly and refrigerating machine

Abstract

The utility model discloses a vibration reduction corrugated pipe assembly and a refrigerating machine, which comprise a corrugated pipe main body, a corrugated pipe upper connecting flange, a corrugated pipe lower connecting flange and a telescopic support assembly, the two ends of the corrugated pipe main body are respectively connected with the corrugated pipe upper connecting flange and the corrugated pipe lower connecting flange; 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 utility model relates to the technical field of refrigerators, in particular to a vibration-damping bellows assembly and a refrigerator. Background Art

[0002] In order to ensure the normal operation of a superconducting quantum computer, a prerequisite is to provide it with a stable and quiet low-temperature environment. The device that can provide this low-temperature environment is currently the most commonly used dilution refrigerator, and the pulse tube refrigerator is the most commonly used pre-cooling equipment on the dilution refrigerator.

[0003] However, the pulse tube refrigerator will generate vibration during operation. This vibration will be gradually transmitted from top to bottom along the dilution refrigerator to the lowest quantum chip installation area, thereby affecting the normal and stable operation of the quantum chip.

[0004] In the prior art, the vibration reduction of the pulse tube refrigerator is achieved through a bellows, and the main connection method is: a normal temperature flange is installed on the top of the low temperature thermostat, and it is installed on the top bracket of the secondary bracket through the bellows. The two ends of the bellows are connected to the top bracket of the secondary bracket and the normal temperature flange by welding. In this way, the bellows mechanically isolates the bracket of the low temperature thermostat and the normal temperature flange, so that the vibration will not be transmitted downward to the low temperature thermostat, and at the same time forms a sealed space with the components under the normal temperature cold plate of the low temperature thermostat. However, this vibration reduction structure has the following problems:

[0005] 1. The vibration reduction structure introduces a secondary bracket, which increases the volume of the structure and occupies 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 radial vibration generated by the pulse tube refrigerator is poorly attenuated. The radial vibration cannot be effectively suppressed, causing additional sway or shear of the structure. The noise generated by the vibration is finally coupled to the noise of the quantum chip. In addition, the additional vibration will increase the difficulty of achieving 10mK temperature control for the dilution refrigerator, making it more difficult to ensure the extremely low temperature environment required for the normal operation of the quantum chip.

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

[0008] Therefore, how to improve the vibration reduction effect of the refrigerator is a technical problem that technicians in this field currently need to solve. Utility Model Content

[0009] One object of the utility model is to provide a vibration-damping bellows assembly, which can effectively improve its vibration-damping effect. Another object is to provide a refrigerator including the vibration-damping bellows assembly.

[0010] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0011] A vibration-damping bellows assembly, comprising:

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

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

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

[0015] Preferably, the empty spring assembly includes an empty spring body, an empty spring upper end plate and an empty spring lower end plate, the two ends of the empty spring body are respectively connected to the empty spring upper end plate and the empty spring lower end plate, the empty spring upper end plate is connected to the upper connecting flange of the bellows, and the empty spring lower end plate is connected to the lower connecting flange of the bellows.

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

[0017] Preferably, the upper end plate of the empty spring is clamped with the upper connecting flange of the bellows, and the lower end plate of the empty spring is clamped with the lower connecting flange of the bellows.

[0018] Preferably, the upper end surface of the upper end plate of the empty spring and the lower end surface of the lower end plate of the empty spring are respectively provided with a wedge-shaped groove, and 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 are respectively provided with a wedge-shaped boss that cooperates with the wedge-shaped groove.

[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, a plurality of groups of the air spring assemblies evenly distributed along the circumferential direction are provided between the upper connecting flange of the bellows and the lower connecting flange of the bellows.

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

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

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

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

[0026] 1. The bellows body is connected to the cold head and the room temperature cold plate through the bellows upper connecting flange and the bellows lower connecting flange. Compared with the existing vibration reduction components, the secondary bracket can be omitted, so the structure can be made more compact. Under the same conditions, the weight of the whole machine will be reduced and the floor space will be reduced.

[0027] 2. An empty spring assembly is provided between the upper connecting flange of the bellows and the lower connecting flange of the bellows. The empty spring assembly has good vertical and radial stiffness. It can support the cold head of the pulse tube refrigerator vertically, avoiding the direct support of the cold head by the main body of the bellows, thereby improving the service life of the bellows and the vertical vibration reduction effect of the main body of the bellows. Moreover, the empty spring assembly also has a certain vibration reduction effect in the vertical direction. The empty spring assembly can also absorb the radial vibration transmitted by the cold head, thereby playing a radial vibration reduction role. After the radial vibration is absorbed by the empty spring assembly, it avoids the radial vibration from directly shearing the main body of the bellows, further improving the service life of the main body of the bellows.

[0028] 3. A retractable support rod and a radial attenuation element are provided between the cold head and the room temperature cold plate. The retractable support rod is tilted, which can not only reduce vibration in the axial and radial directions, but also support the cold head. In addition, the radial attenuation element can reduce vibration in the radial direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0030] Figure 1 A cross-sectional view of a vibration-damping bellows assembly provided in a specific embodiment of the utility model;

[0031] Figure 2 A cross-sectional view of a vibration-damping bellows assembly provided in another specific embodiment of the utility model;

[0032] Figure 3 A cross-sectional view of a vibration-damping bellows assembly having a telescopic support rod and a radial attenuation element provided in a specific embodiment of the utility model.

[0033] The reference numerals are as follows:

[0034] 1 is the bellows body, 2 is the bellows upper connecting flange, 3 is the bellows lower connecting flange, 4 is the cold head, 41 is the mounting flange, 5 is the room temperature cold plate, 6 is the empty spring assembly, 61 is the empty spring body, 62 is the empty spring upper end plate, 63 is the empty spring lower end plate, 7 is the empty spring adjusting rod, 8 is the adjusting nut, 9 is the counterweight ring, 10 is the telescopic support rod, and 11 is the radial attenuation element. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] Please refer to Figure 1 The vibration-damping bellows assembly provided by the embodiment of the utility model can be applied to a pulse tube refrigerator. The vibration-damping bellows assembly includes: a bellows body 1, a bellows upper connecting flange 2, a bellows lower connecting flange 3, and a retractable support assembly. The two ends of the bellows body 1 are respectively connected to the bellows upper connecting flange 2 and the bellows lower connecting flange 3. The bellows upper connecting flange 2 is connected to the mounting flange 41 of the cold head 4. The bellows lower connecting flange 3 is connected to the normal temperature cold plate 5. The bellows body 1 is connected to the cold head 4 and the normal temperature cold plate 5 through the bellows upper connecting flange 2 and the bellows lower connecting flange 3. Compared with the existing vibration-damping 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 space can be reduced. The retractable support assembly is directly or indirectly connected to the cold head 4 and the normal temperature cold plate 5, respectively. The retractable support assembly can support the cold head 4, so that the bellows body 1 can be adjusted to a natural elongated state, thereby improving the service life of the bellows body 1.

[0037] In some embodiments, the retractable support assembly is an empty spring assembly 6, and the two ends of the empty spring assembly 6 are respectively connected to the upper connecting flange 2 of the bellows and the lower connecting flange 3 of the bellows. The empty spring assembly 6 has good vertical stiffness and radial stiffness, and can support the cold head 4 of the pulse tube refrigerator vertically, avoiding the bellows body 1 directly supporting the cold head 4, thereby improving the service life of the bellows, and also improving the vertical vibration reduction effect of the bellows body itself, and the empty spring assembly 6 also has a certain vibration reduction effect in the vertical direction, which can expand the vibration reduction effect of the vibration reduction bellows assembly, and in the radial direction, the empty spring assembly 6 can also absorb the radial vibration transmitted by the cold head 4, thereby playing a radial vibration reduction role, which can solve the problem of poor radial vibration reduction of a single bellows, and after the radial vibration is absorbed by the empty spring assembly 6, it is avoided that the radial vibration directly forms a shearing effect on the bellows body 1, further improving the service life of the bellows body 1.

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

[0039] In some embodiments, the empty spring assembly 6 also includes an empty spring adjustment rod 7 and an adjustment nut 8, the mounting flange 41 and the upper connecting flange 2 of the bellows are provided with a mounting hole for the empty spring adjustment rod 7 to pass through, the lower end of the empty spring adjustment rod 7 is connected to the upper end plate 62 of the empty spring, and the adjustment nut 8 is threadedly connected to the upper end of the empty spring adjustment rod 7. The initial height of the empty spring body 61 can be adjusted by adjusting the nut 8 to ensure that the bellows body 1 is in a natural elongation state, wherein two adjustment nuts 8 can be connected to the upper end of the empty spring adjustment rod 7 to prevent loosening. In addition, the empty spring adjustment rod 7 and the adjustment nut 8 can also fix the upper connecting flange 2 of the bellows. The lower connecting flange 3 of the bellows can also be connected to the normal temperature cold plate 5 by bolts. That is, the connection mode of the upper connecting flange of the bellows and the cold head 4 and the connection mode of the lower connecting flange 3 of the bellows and the normal temperature cold plate 5 are respectively detachable connections, which can facilitate the disassembly and maintenance of the bellows.

[0040] In some embodiments, please refer to Figure 2, the upper end plate 62 of the empty spring is clamped with the upper connecting flange 2 of the bellows, and the lower end plate 63 of the empty spring is clamped with the lower connecting flange 3 of the bellows. Among them, the upper end surface of the upper end plate 62 of the empty spring and the lower end surface of the lower end plate 63 of the empty spring are respectively provided with a wedge-shaped groove, and the lower end surface of the upper connecting flange 2 of the bellows and the upper end surface of the lower connecting flange 3 of the bellows are respectively provided with a wedge-shaped boss that cooperates with the wedge-shaped groove. The wedge-shaped connection structure can play a role in radial limiting the empty spring assembly 6, thereby ensuring the connection stability of the empty spring assembly 6.

[0041] In some embodiments, a weight ring 9 is provided at the upper end of the mounting flange 41. The weight ring 9 of different masses can be used to adjust the initial height of the empty spring body 61 to ensure that the bellows is in a naturally extended state. The weight ring 9 can be magnetically adsorbed on the upper end surface of the mounting flange 41, or can be detachably connected to the upper end surface of the mounting flange 41 in other ways.

[0042] In some embodiments, multiple groups of empty spring assemblies 6 evenly distributed along the circumferential direction are provided between the upper connecting flange 2 of the bellows and the lower connecting flange 3 of the bellows. For example, three groups of empty spring assemblies 6 can be distributed on the periphery of the bellows body 1. In addition, other multiple numbers of empty spring assemblies 6 can also be distributed, and the specific selection can be made according to actual needs.

[0043] In some embodiments, Figure 3 As shown, the telescopic support assembly includes a telescopic support rod 10 and a radial attenuation element 11. Specifically, three groups of telescopic support rods 10 and radial attenuation 11 evenly distributed along the circumferential direction can be arranged to form a three-point support stable structure. One end of the telescopic support rod 10 is connected to the cold head 4, and the radial attenuation element 11 is connected to the room temperature cold plate 5. The radial stiffness and damping of the radial attenuation element 11 can be designed according to the actual radial vibration reduction needs. The radial attenuation element 11 can adopt a composite damping steel plate. The other end of the telescopic support rod 10 is hinged to the radial attenuation element 11, and both preferably adopt a ball joint to adjust the assembly problems caused by small processing errors. The axis of the telescopic support rod 10 is tilted relative to the axis of the cold head 4, and the inclination angle can be selected according to actual needs.

[0044] In some embodiments, the upper end of the room temperature cold plate 5 is provided with a groove for accommodating the lower connecting flange 3 of the bellows. The groove can play a radial limiting role on the lower connecting flange 3 of the bellows, thereby ensuring the position accuracy of the lower connecting flange 3 of the bellows installed on the room temperature cold plate 5.

[0045] An embodiment of the utility model further provides a refrigerator, comprising the vibration-damping bellows assembly provided by any of the above embodiments. The refrigerator may be a pulse tube refrigerator. The beneficial effects of the refrigerator may refer to the above vibration-damping bellows assembly and will not be described in detail here.

[0046] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0047] The above is a detailed introduction to a vibration-damping bellows assembly and a refrigerator provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiment is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A vibration-damping bellows assembly, characterized in that: include: A bellows body (1), a bellows upper connecting flange (2) and a bellows lower connecting flange (3), wherein two ends of the bellows body (1) are respectively connected to the bellows upper connecting flange (2) and the bellows lower connecting flange (3), the bellows upper connecting flange (2) is used to connect to a mounting flange (41) of a cold head (4), and the bellows lower connecting flange (3) is used to connect to a room temperature cold plate (5); A retractable support assembly is directly or indirectly connected to the cold head (4) and the room temperature cold plate (5) respectively.

2. The vibration damping bellows assembly according to claim 1, characterized in that: The telescopic support assembly is an empty spring assembly (6), and the two ends of the empty spring assembly (6) are respectively connected to the upper connecting flange (2) of the bellows and the lower connecting flange (3) of the bellows.

3. The vibration damping bellows assembly according to claim 2, characterized in that: The empty spring assembly (6) includes an empty spring body (61), an empty spring upper end plate (62) and an empty spring lower end plate (63), the two ends of the empty spring body (61) are respectively connected to the empty spring upper end plate (62) and the empty spring lower end plate (63), the empty spring upper end plate (62) is connected to the bellows upper connecting flange (2), and the empty spring lower end plate (63) is connected to the bellows lower connecting flange (3).

4. The vibration damping bellows assembly according to claim 3, characterized in that: The empty spring assembly (6) also includes an empty spring adjustment rod (7) and an adjustment nut (8); the mounting flange (41) and the connecting flange (2) on the bellows are provided with mounting holes for the empty spring adjustment rod (7) to pass through; the lower end of the empty spring adjustment rod (7) is connected to the empty spring upper end plate (62); and the adjustment nut (8) is threadedly connected to the upper end of the empty spring adjustment rod (7).

5. The vibration-damping bellows assembly according to claim 3, characterized in that: The upper end plate (62) of the empty spring is clamped with the upper connecting flange (2) of the bellows, and the lower end plate (63) of the empty spring is clamped with the lower connecting flange (3) of the bellows.

6. The vibration-damping bellows assembly according to claim 5, characterized in that: The upper end surface of the empty spring upper end plate (62) and the lower end surface of the empty spring lower end plate (63) are respectively provided with a wedge-shaped groove, and the lower end surface of the bellows upper connecting flange (2) and the upper end surface of the bellows lower connecting flange (3) are respectively provided with a wedge-shaped boss that cooperates with the wedge-shaped groove.

7. The vibration-damping bellows assembly according to claim 6, characterized in that: 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 vibration-damping bellows assembly according to claim 2, characterized in that: A plurality of groups of the empty spring components (6) evenly distributed along the circumferential direction are arranged between the upper connecting flange (2) of the bellows and the lower connecting flange (3) of the bellows.

10. The vibration-damping bellows assembly according to claim 1, characterized in that: The telescopic support assembly comprises a telescopic support rod (10) and a radial attenuation element (11), one end of the telescopic support rod (10) is connected to the cold head (4), the radial attenuation element (11) is connected to the room temperature cold plate (5), the other end of the telescopic support rod (10) is hinged to the radial attenuation element (11), and the axis of the telescopic support rod (10) is inclined relative to the axis of the cold head (4).

11. The vibration-damping bellows assembly according to claim 1, characterized in that: The upper end of the room temperature cold plate (5) is provided with a groove for accommodating the lower connecting flange (3) of the bellows.

12. A refrigerator, characterized in that: A vibration-damping bellows assembly comprising any one of claims 1 to 9.

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