Shock absorption device, shock absorption method and low-temperature refrigerator

Abstract

The present invention discloses a shock absorbing device, a shock absorbing method, and a low-temperature refrigerator, which relate to the field of shock absorption technology. The shock absorbing device includes: a fixed structure for mounting the vibration source device on the target device; an upper end bellows, the upper end of which is mounted on the fixed structure and the lower end is connected to the vibration source device; a lower end bellows, the upper end of which is connected to the vibration source device and the lower end is connected to the target device, the lower end bellows being used to transport the medium transmitted by the vibration source device to the target device; and a gas control module, which is connected to the inner cavity of the upper end bellows and is used to control the gas pressure in the upper end bellows to change the length of the upper end bellows. The shock absorbing device can change the length of the bellows by adjusting the gas pressure in the upper end bellows, thereby changing the vibration frequency, achieving vibration isolation and frequency regulation, ensuring the stability of medium transportation, and improving the adaptability and overall reliability of the shock absorbing device.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration reduction, and in particular to a vibration reduction device, a vibration reduction method and a low-temperature refrigerator. Background Art

[0002] During the operation of cryogenic refrigerators and related equipment, the source device often needs to deliver cryogenic medium to the target device. During this process, the vibration generated by the source device can directly affect the stability and performance of the target device. Especially in applications requiring a high degree of sealing, this vibration may cause medium leakage, affecting the cooling effect.

[0003] Traditionally, vibration damping has been achieved by mounting the source equipment to a frame using elastic devices such as springs to counteract vibration. However, this approach has limitations when it comes to tight sealing requirements and cannot effectively prevent media leakage. To overcome these shortcomings, current improvements are using bellows instead of springs as shock-absorbing supports and connectors. This reduces the inherent vibration of the vibration load and improves the airtightness of the conveyed media.

[0004] While bellows can provide a certain degree of vibration reduction, practical challenges remain. When the source device transmits different media, the vibration frequencies it generates may vary, leading to resonance and reducing the vibration reduction effect. Furthermore, if the source device is heavy, one end of the bellows may stretch while the other contract, even exceeding the bellows' expansion and contraction limits, resulting in more serious consequences. Summary of the Invention

[0005] Based on this, it is necessary to provide a shock absorbing device, a shock absorbing method and a low-temperature refrigerator that can balance the mass of the earthquake source and improve the shock absorption effect in order to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, a first embodiment of the present invention provides a shock absorbing device for shock absorbing a source device to reduce the vibration transmitted to a target device, comprising:

[0007] A fixing structure for mounting the source device on the target device;

[0008] An upper end bellows, the upper end of which is mounted on the fixed structure and the lower end of which is connected to the seismic source device;

[0009] A lower end bellows, the upper end of which is connected to the source device and the lower end of which is connected to the target device, and the lower end bellows is used to transport the medium transmitted by the source device to the target device;

[0010] The gas control module is communicated with the inner cavity of the upper end bellows and is used to control the gas pressure in the upper end bellows to change the length of the upper end bellows.

[0011] A second embodiment of the present invention provides a vibration reduction method, which is applied to the vibration reduction device provided in the first embodiment. The method includes:

[0012] During the operation of the shock absorbing device, detecting the vibration generated by the vibration source device and the upper end bellows and the lower end bellows;

[0013] If the vibration condition meets the preset shock absorption condition, the air pressure in the first sealed cavity of the upper end bellows is adjusted and the length of the upper end bellows is changed to reduce the vibration generated by the source equipment and the upper end bellows and the lower end bellows.

[0014] A third embodiment of the present invention provides a low-temperature refrigerator, comprising the shock absorbing device provided in the first embodiment.

[0015] A fourth embodiment of the present invention provides a low-temperature refrigerator, including the vibration reduction method provided in the second embodiment.

[0016] The aforementioned vibration reduction method, device, and cryogenic refrigerator utilize a fixed structure to mount the source device to the target device. The upper bellows are connected to the fixed structure, and the air pressure is adjusted via a gas control module to vary the bellows' length, thereby changing the vibration frequency and effectively absorbing and suppressing vibration transmission. Simultaneously, the lower bellows connects the source device to the target device, transmitting the medium and maintaining the continuity and tightness of the medium flow. This vibration reduction device not only achieves vibration isolation and frequency regulation, but also ensures the stability of medium delivery, improving the adaptability and overall reliability of the vibration reduction device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a structural schematic diagram of a shock absorbing device in one embodiment;

[0018] Figure 2 is another structural schematic diagram of a shock absorbing device in one embodiment;

[0019] Figure 3 is another structural schematic diagram of a shock absorbing device in one embodiment;

[0020] Figure 4 is a flow chart of a shock absorption control method according to an embodiment;

[0021] Figure 5 FIG. 1 is a schematic diagram of a process for suppressing resonance in an embodiment.

[0022] Description of the drawings: fixed structure 10; upper end bellows 11; lower end bellows 12; gas control module 13; third device 14; mounting member 20; support member 30; first support portion 301; first fixing portion 302; second support portion 303; mounting portion 304; third support portion 305; second fixing portion 306. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0024] The following describes in detail the implementation details of the technical solutions of the embodiments of the present application.

[0025] Figures 1 to 3 The following diagrams illustrate the structures of various vibration-absorbing devices. These devices are suitable for use in situations where vibrations are generated by source equipment during operation. They effectively reduce the transmission of vibrations to target equipment, improving the overall stability and reliability of the system. The following describes the structure and operating principle of the vibration-absorbing devices in detail using various embodiments.

[0026] In one embodiment, a shock absorbing device is provided. The shock absorbing device includes a fixing structure 10 , an upper bellows 11 , a lower bellows 12 , and a gas control module 13 .

[0027] The fixing structure 10 is used to securely mount the source device on the target device. It possesses sufficient structural strength to provide overall support and fixation to withstand the loads and dynamic reaction forces generated by the source device during operation. In practical applications, the fixing structure 10 can be installed on top of the target device and rigidly connected to the target device through welding or other connection methods.

[0028] The upper end of the upper bellows 11 is firmly mounted on the fixed structure 10, and the lower end is connected to the source device. The upper bellows 11 is a closed sealed structure, and a sealed cavity is formed inside, which can be connected to the gas control module 13. The gas control module 13 can selectively fill or extract gas into or out of the cavity of the upper bellows 11 as needed to adjust the air pressure inside the upper bellows 11. By adjusting the air pressure, the upper bellows 11 can change in the length direction, and this change can change the response characteristics of the vibration frequency of the system. Therefore, the gas control module 13 can achieve dynamic adjustment of the vibration frequency of the system by precisely adjusting the air pressure in the upper bellows 11, thereby improving the shock absorption effect of the shock absorption device.

[0029] The upper end of the lower bellows 12 is connected to the source device, and the lower end is connected to the target device, forming a medium transmission path. This path is used to transport the medium output from the source device to the target device for subsequent processing, ensuring a stable installation of the source device and smooth medium transportation.

[0030] It should be noted that the source device and target device are not components of the shock absorption device of the present invention; rather, they are external devices within the application environment of the shock absorption device. The source device is the device that generates vibrations and serves as the vibration source for the shock absorption device to control and isolate vibrations; the target device is used to receive the medium transmitted by the source device.

[0031] In this embodiment, by setting a sealed upper end bellows 11 to be connected to the gas control module 13, the length of the upper end bellows 11 can be controlled by adjusting the air pressure in the upper end bellows 11, thereby dynamically adjusting the vibration frequency of the system and enhancing the shock absorbing effect and stability of the shock absorbing device.

[0032] In one embodiment, to achieve superior shock absorption, the upper bellows 11 and lower bellows 12 of the shock absorption device are designed to be coaxially arranged, with their axes aligned in the same vertical direction. This vertical coaxial arrangement of the two bellows achieves structural symmetry and balance across the entire system, facilitating balanced force distribution across the source device and effective control of vibration direction.

[0033] The seismic source device is arranged between the upper bellows 11 and the lower bellows 12 and is suspended in the vertical direction. In order to make the seismic source device reach an ideal suspended state, the interior of the upper bellows 11 is adjusted to a negative pressure state through the gas control module 13. When the negative pressure acts on the internal space of the bellows, the bellows generates axial suction in the vertical direction, and this suction acts on the connected seismic source device, causing it to be pulled upward. Under this working condition, the seismic source device forms a balance between the suction generated by the upper bellows 11 and its own weight, and can adsorb the seismic source device between the two sections of the bellows, so that the seismic source device is in a suspended or partially suspended working state.

[0034] When the source device is in a suspended state, it relies on the combined effect of air pressure difference and the elastic support of the bellows, which can significantly reduce the path of vibration transmission outward and further enhance the anti-resonance ability of the shock absorber in the vertical direction.

[0035] In practical applications, the negative pressure inside the upper bellows 11 can be achieved through the gas control module 13. The gas control module 13 can monitor and regulate the pressure inside the bellows in real time to keep the source device in a dynamic equilibrium position. For example, during the initial operation, when the source device has not yet reached equilibrium, the system can rapidly increase the suction force by reducing the internal pressure of the upper bellows 11, bringing it closer to the target suspension height. During the steady-state operation phase, a constant negative pressure is maintained to ensure stable vertical suspension of the source device.

[0036] It should be noted that although the source device is on an ideal vertical axis in this embodiment, in actual applications, the shock absorbing device has a certain tolerance capability and can adapt to offsets within a certain range. Even if there is a slight axis offset or tilt, it can still effectively achieve vibration isolation and shock absorption functions.

[0037] In this embodiment, by arranging the upper end bellows 11 and the lower end bellows 12 coaxially in the vertical direction, and forming a negative pressure suction force inside the upper end bellows 11 to suspend the source device therein, the transmission of the natural vibration of the source device to the target device can be minimized, thereby improving the vibration isolation performance and stability of the overall system.

[0038] In one embodiment, in order to further improve the shock absorption performance and working stability of the device, the diameter of the upper end bellows 11 is set to be larger than the diameter of the lower end bellows 12, which helps to improve the negative pressure adsorption capacity, and also provides a more stable vertical suspension support for the source equipment, thereby achieving reliable suspension of the source equipment without relying on other external support devices.

[0039] Specifically, a seismic source device is provided between the upper bellows 11 and the lower bellows 12 arranged in the vertical direction. During the operation of the system, the upper bellows 11 forms an internal negative pressure through the gas control module 13, and the negative pressure acts on the top of the connected seismic source device to generate an upward suction force. When the diameter of the upper bellows 11 is larger than that of the lower bellows 12, on the one hand, the larger cross-sectional area of the upper bellows 11 can be utilized to form a larger total suction force. On the other hand, the suction force generated by the larger diameter of the upper bellows 11 can also balance or overcome the force generated by the lower bellows 12 and the weight of the equipment, ensuring that the seismic source device is always in the predetermined working position in the vertical direction.

[0040] In actual applications, even in specific applications, the lower end bellows 12 is in a negative pressure state. Since the diameter of the lower end bellows 12 is relatively small, the smaller diameter means that the total suction force generated by its negative pressure is limited, which is not enough to offset or destroy the suspension force provided by the upper end bellows 11. Therefore, the source equipment can still be stably in an approximate suspension state.

[0041] In this embodiment, through the optimized design that the diameter of the upper end bellows 11 is larger than the diameter of the lower end bellows 12, the shock absorbing device can form a suspended support state without the aid of other auxiliary means. Even in the presence of negative pressure interference from the lower end bellows 12, the shock absorbing performance and stability of the system can be maintained.

[0042] In one embodiment, the upper bellows 11 and the lower bellows 12 of the shock absorber each constitute an independently sealed negative pressure chamber, specifically comprising a first sealed chamber disposed within the upper bellows 11, and a second sealed chamber disposed within the lower bellows 12. The air pressure within the first sealed chamber and the second sealed chamber is set to be lower than the external ambient pressure of the shock absorber.

[0043] Here, the air pressure in the first sealed cavity is set to a negative pressure state lower than atmospheric pressure, so as to cooperate with the upper end bellows 11 to provide adsorption force to the source device. The air pressure in the second sealed cavity is set to a negative pressure state lower than atmospheric pressure, which can reduce the reaction force of the structure to the vibration response, thereby improving the overall vibration isolation effect. Based on this, when the source device vibrates, since the internal air pressure is lower than the ambient air pressure, the bellows can absorb and disperse the vibration more flexibly, and will not cause drastic changes in the bellows due to sudden changes in air pressure, thereby enhancing the supporting effect and shock absorption effect of the bellows on the source device, and effectively alleviating the impact of vibration on the equipment.

[0044] In this embodiment, by establishing independent low-pressure sealed cavities for the upper bellows 11 and the lower bellows 12 and ensuring that the internal air pressure is always lower than the external air pressure of the device, the system's isolation performance against vibration interference is improved, while providing a stable suspension and support foundation for the source equipment.

[0045] In one embodiment, Figure 1 and Figure 2 The fixed structure 10 of the vibration damping device is directly fixed to the target device. Specifically, the fixed structure 10 is designed to securely connect to the surface of the target device, typically through a rigid connection, creating a stable, immovable connection between the fixed structure 10 and the target device. This secure installation allows the source device and the target device to form an integrated structure, ensuring that the load and dynamic reaction force generated by the source device during operation are effectively transmitted to the target device through the fixed structure 10.

[0046] In one embodiment, when the fixing structure 10 is directly fixed to the target device, reference Figure 1 and Figure 2 The fixed structure 10 further includes a mounting member 20 and a supporting member 30, which are used to achieve the structural positioning of the upper end bellows 11 and the stable connection of the shock absorption system as a whole, so as to enhance the stability of the shock absorption device.

[0047] The mounting member 20 is used to install the upper end bellows 11, and serves as a direct mounting platform for the upper end bellows 11, providing a precise and secure mounting position for the upper end bellows 11. As a key shock-absorbing component, the upper end bellows 11 withstands and transmits axial vibrations from the source equipment during operation. Therefore, the mounting member 20 must have sufficient structural strength and connection stiffness to prevent the bellows from displacement, loosening, or performance degradation due to vibration. In practical applications, the mounting member 20 can be made of metal with high rigidity and excellent wear resistance, and is securely connected to the joint of the upper end bellows 11 by welding, bolting, or other mechanical fixing methods.

[0048] The support member 30 is used to provide an integral support base for the mounting member 20. A rigid connection structure is used between the support member 30 and the mounting member 20, so that the two form a rigid whole in the force transmission path, thereby effectively avoiding structural resonance caused by relative displacement or insufficient rigidity at the connection point. The support member 30 is also suitable for fixing to the target device. The arrangement of the support member 30 has a certain adaptability, such as Figure 2 As shown, the support member 30 can be directly fixed on the target device, so that the shock absorbing device forms an integrated structure with the target device; Figure 1 As shown, the support member 30 can also be indirectly connected to the target device. In actual application, the support member 30 can be implemented in the form of a frame, a support or a bracket according to the actual use scenario.

[0049] The rigid connection between the mounting member 20 and the support member 30 ensures the structural integrity of the shock absorber. When the source device is in operation, the vibration generated by it is transmitted upward through the upper end bellows 11, and acts on the support member 30 through the mounting member 20, and then transmitted to the target device installation surface.

[0050] In one embodiment, the fixed structure 10 of the shock absorbing device not only serves to fix the source device on the target device, but also has a channel provided on the fixed structure 10, so that the lower end bellows 12 is indirectly connected to the target device through the channel in the fixed structure 10, so as to realize smooth connection of medium transportation.

[0051] Specifically, one end of the lower bellows 12 is reliably connected to the source device, while the other end is securely fixed to the fixed structure 10. To ensure the continuity and sealing of the medium transported from the source device to the target device, a pre-set channel is provided within the fixed structure 10. This channel is used to connect the fluid path between the lower bellows 12 and the target device. In actual use, the installation position of the lower bellows 12 is connected to the channel of the fixed structure 10. After the medium is output from the source device, it enters the fixed structure 10 through the lower bellows 12 and is smoothly introduced into the target device through the channel in the fixed structure 10.

[0052] In this embodiment, the channel of the fixed structure 10 serves as an intermediate node between the lower end bellows 12 and the target device, thereby achieving the compactness of the overall device structure, ensuring the airtightness and safety of the transmission path, and effectively avoiding leakage or loss of the medium during transmission.

[0053] In one embodiment, when the fixed structure 10 is used as a fluid path for delivering the medium to the target device, the lower end of the lower bellows 12 of the shock absorbing device is adapted to be indirectly rigidly connected to the target device. Figure 2 As shown, the support member 30 includes a second support portion 303, a mounting portion 304, a third support portion 305 and a second fixing portion 306 to achieve a complete force transmission path from the upper end bellows 11 to the target device and ensure the connectivity of the medium transmission channel and the rigidity of the structure.

[0054] The upper end of the second support portion 303 is rigidly connected to the mounting member 20, supporting the upper bellows 11 and reliably transmitting the structural load it carries to the lower structure. This arrangement ensures that the upper bellows 11 remains stably attached to the mounting structure during vibration transmission, preventing lateral swing or non-axial displacement, thereby maintaining the operating accuracy of the shock absorber.

[0055] The mounting portion 304 is rigidly connected to the lower end of the second support portion 303 and is a key structure for connecting the lower bellows 12. The design of the mounting portion 304 not only provides a mounting platform for the lower bellows 12 but also, through the inclusion of a through hole, allows for a continuous flow of the medium. This through hole is precisely aligned axially with the transmission channel of the lower bellows 12, ensuring that the medium, after exiting the bellows, can continue along the predetermined path and flow into the lower structure.

[0056] The upper end of the third support portion 305 is rigidly connected to the mounting portion 304. Its function is to extend the structure further and provide support below the through-hole. It also serves as a relay in the vibration transmission path. The third support portion 305 is vertically arranged and internally defines a vertical channel. This channel is spatially connected to the through-hole of the mounting portion 304 and aligned with the inlet of the target device. This structural design allows the medium, after passing through the lower bellows 12, to be continuously transported downward along the vertical channel into the target device, thus completing the structural closed-loop transmission path.

[0057] A second fixing portion 306 is provided at the lower end of the third support portion 305 and is rigidly connected thereto. This second fixing portion 306 securely fastens the entire support structure to the target device, ensuring a stable and reliable connection between the lower bellows 12 and the target device. This second fixing portion 306 ensures that even if the lower bellows 12 does not directly contact the target device, media transmission and vibration energy conduction can still be achieved through the multi-stage support structure, thus meeting the rigid coupling requirements of the indirect structural connection.

[0058] In this embodiment, the combined structural design of the second support portion 303, the mounting portion 304, the third support portion 305 and the second fixing portion 306 realizes the rigid connection and medium transmission between the lower end bellows 12 and the target device in an indirect manner.

[0059] In one embodiment, the lower end of the lower bellows 12 of the shock absorber is suitable for being directly rigidly connected to the target device. This rigid connection structure ensures that the lower bellows 12 can achieve mechanical continuity with the target device when receiving medium transmission and vibration coupling, thereby improving the integrity and reliability of the entire shock absorber during the vibration control process. Figure 1 In the case where the lower end of the lower end bellows 12 is directly and rigidly connected to the target device, the specific structure of the support member 30 will be described in detail.

[0060] The support member 30 specifically includes a first support portion 301 and a first fixing portion 302. The upper end of the first support portion 301 is rigidly connected to the mounting member 20, providing the mounting member 20 with sufficient structural support to stably support the upper end of the corrugated pipe 11 mounted thereon. As the intermediate load-bearing member connecting the upper mounting structure with the lower mounting base, the first support portion 301 ensures that the connection structure will not loosen or deform even under conditions of sustained vibration of the seismic source equipment.

[0061] The lower end of the first supporting portion 301 is rigidly connected to the first fixing portion 302 , and the first fixing portion 302 is used to firmly fix the entire supporting structure on the target device.

[0062] This structure creates a continuous, rigid connection path from the upper bellows 11 mounting point to the target device. During operation, vibrations are transmitted through the bellows to the mounting member 20, and then, step by step, to the target device via the first support portion 301 and the first fixing portion 302. This enhances the overall rigidity and installation stability of the shock-absorbing device, while also improving its shock-absorbing performance.

[0063] In one embodiment, Figure 3As shown, the fixed structure 10 of the shock-absorbing device is not directly connected to the target device body. Instead, it is interposed between the two via a third device 14, acting as an intermediate connection medium to achieve indirect rigid fixation. Specifically, the third device 14 is provided with a connection interface compatible with the target device. One end is securely mounted to the target device body via a rigid connection, while the other end is rigidly connected to the fixed structure 10 to form a stable fit. This allows the fixed structure 10 to be securely mounted on the third device 14, thereby maintaining a stable posture and support configuration when subjected to disturbances transmitted by the source device.

[0064] In one embodiment, reference Figure 3 The fixed structure 10 of the shock absorbing device further includes a mounting member 20 and a support member 30, which are used to achieve the structural positioning of the upper end bellows 11 and the stable connection of the shock absorbing system as a whole, so as to enhance the stability of the shock absorbing device. The relevant description of the mounting member 20 and the support member 30 can refer to the relevant content of the above embodiment. It should be noted that, if Figure 3 As shown, the support member 30 of this embodiment is mounted together with the target device on a third device 14. This supports the weight of the target device and the support member 30, ensuring that the fixed structure 10 and the target device remain relatively stationary. This prevents the target device from being sucked into the target device due to the negative pressure in the first sealed chamber when the target device is lightweight. The third device 14 can be a ground-based or independently installed platform. Regardless of the mounting method used for the support member 30, it is intended to provide a stable mounting base for the shock absorber that does not shift with the workload, thereby effectively preventing performance degradation caused by relative structural movement.

[0065] In one embodiment, when the fixed structure 10 is fixed to the target device by the third device 14, the lower end of the lower end bellows 12 of the shock absorbing device is suitable for being directly rigidly connected to the target device. To achieve this connection, Figure 3 As shown, support member 30 includes a first support portion 301 and a first fixing portion 302. The upper end of first support portion 301 is rigidly connected to mounting member 20, providing mounting member 20 with sufficient structural support to stably support the upper end bellows 11 mounted thereon. First support portion 301 serves as an intermediate load-bearing structure connecting the upper mounting structure and the lower mounting base, ensuring that the connection structure will not loosen or deform under conditions of sustained vibration of the seismic source equipment.

[0066] The lower end of the first support portion 301 is rigidly connected to the first fixing portion 302, which is then mounted together with the target device on the third device 14. The third device 14 serves as a support base for the first fixing portion 302, ensuring that the third device 14 maintains a constant relative position to the target device during use and provides sufficient mounting strength.

[0067] Through this structure, the entire support member 30 forms a continuous, rigid connection path from the mounting point of the upper bellows 11 to the third device 14. During operation, vibrations are transmitted through the bellows to the mounting member 20, and then gradually transmitted through the first support portion 301 and the first fixing portion 302 to the third device 14. This enhances the overall rigidity and installation stability of the shock-absorbing device, while also improving its shock-absorbing performance.

[0068] It should be noted that the vibration source device in the vibration reduction device of different embodiments can be configured as a cryogenic refrigerator body, a cooling head, or a pipe for transmitting a medium, depending on specific application requirements. Specifically, when the vibration source device is a cryogenic refrigerator body, the mechanical vibration generated during operation can be effectively isolated by bellows installed above and below it, preventing the vibration from being transmitted to the target device, thereby improving the overall vibration suppression capability of the system. When the vibration source device is a cooling head, due to its relatively light weight, it may not meet the mass matching requirements of the bellows, which in turn affects the self-balancing state and vibration reduction performance of the system. To this end, an additional load or counterweight structure can be installed on the cooling head body or its connection to increase the overall mass and enhance its compatibility with the bellows, thereby improving the stability and vibration reduction effect of the system. Similarly, when the vibration source device is a pipe for transmitting a medium, if the pipe mass is relatively low, a counterweight component can be installed on its exterior to achieve an ideal equivalent mass distribution and self-balancing state in the vibration transmission path, thereby further optimizing the vibration reduction performance, dynamic response characteristics, and resonance avoidance capabilities.

[0069] In one embodiment, in order to further enhance the intelligent control capability of the shock absorbing device, the shock absorbing device further includes a detection module and a control module to realize real-time monitoring and air pressure regulation control of the vibration conditions between the source device and the bellows.

[0070] The detection module is configured to collect vibrations generated during the operation of the seismic source device, particularly the dynamic response of the vibrations as they are transmitted to the upper bellows 11 and lower bellows 12. The detection module may include an accelerometer, displacement sensor, or other type of vibration sensing element, positioned within the seismic source device, at the connection point of the upper bellows 11, or at the mounting point of the lower bellows 12, to obtain complete and continuous vibration data. By detecting vibrations at these key locations, it is possible to effectively determine whether the system exhibits dynamic characteristics of resonance.

[0071] The control module is connected to the detection module and is used to receive and analyze the vibration signal collected by the detection module. When the source device is conveying a medium, its vibration frequency may change due to the properties of the conveyed medium, which will cause the vibration frequency generated by the source device to be close to or coincide with the natural frequency of the shock absorbing device, thereby causing a resonance phenomenon and affecting the shock absorption performance of the system. The control module is internally provided with a control logic for judging whether the vibration condition meets the preset shock absorption conditions. The preset conditions may include one or more indicators such as the vibration frequency reaching the resonance range. When it is detected that the vibration condition meets the preset shock absorption conditions, the control module will output a control signal according to the judgment result, instructing the gas control module 13 to adjust the air pressure of the first sealed cavity in the upper end bellows 11 accordingly.

[0072] After receiving instructions from the control module, the gas control module 13 injects or exhausts gas from the first sealed chamber, thereby dynamically adjusting the pressure state of the upper bellows 11. This adjustment process directly affects the stiffness and vibration response frequency of the upper bellows 11, causing the natural frequency of the entire system to deviate from the current vibration frequency of the source device, thereby preventing resonance and effectively weakening the intensity of vibration propagation within the system.

[0073] In this embodiment, the detection module and control module collaborate to achieve automatic monitoring and closed-loop control of the vibration reduction process, enabling the vibration reduction device to respond in real time and achieve intelligent adjustment capabilities. This not only improves the vibration reduction efficiency but also significantly enhances the device's adaptability and stability under variable operating conditions or complex vibration conditions. In particular, in cryogenic refrigerators, where the vibration source equipment may experience frequency variations due to different operating phases, this structure allows for continuous adjustment of the operating state of the upper bellows 11 during system operation, ensuring that vibration interference during the refrigeration process remains within a controllable range.

[0074] It should be noted that the gas control module 13 of this embodiment can not only be used to isolate or suppress the mechanical vibrations generated by the source device, but can also be further applied to technical scenarios that require tracking the resonant frequency to achieve a resonant response effect. In such applications, the source device is not just a device that requires shock absorption, but requires efficient transmission of vibrations of a specific frequency or frequency range to the target device to achieve functions such as resonance enhancement, resonance measurement, or excitation of specific physical processes. Specifically, in this type of implementation, the gas control module 13 dynamically adjusts the air pressure in the first sealed cavity in the upper end bellows 11, thereby adjusting the natural frequency of the entire system to match or be close to the resonant frequency, forming a controlled resonant coupling state, and achieving the purpose of efficient resonance.

[0075] In one embodiment, Figure 4 As shown, a vibration reduction control method is provided, which is applicable to the vibration reduction device equipped with the above embodiment. The method may include the following steps:

[0076] Step S101 , during the operation of the shock absorbing device, detecting the vibration conditions generated by the source device and the upper and lower bellows.

[0077] During the actual operation of the shock-absorbing device, the vibration conditions generated by the source device and the upper bellows 11 and the lower bellows 12 are first monitored in real time. The vibration signal generated by the source device during operation can be obtained through the detection module in the shock-absorbing device. In actual applications, the vibration conditions may include relevant parameters such as vibration frequency and amplitude. Since the vibration characteristics exhibited by the cryogenic refrigerator at different operating stages are somewhat dynamic, the detection process needs to be continuous and real-time to promptly capture potential resonance trends or vibration enhancement phenomena.

[0078] Step S102: If the vibration condition meets the preset vibration reduction condition, the air pressure in the first sealed cavity of the upper bellows is adjusted, and the length of the upper bellows is changed to reduce the vibration generated by the source equipment and the upper and lower bellows.

[0079] The detected vibration is analyzed and processed to determine whether the current vibration meets the preset vibration reduction conditions. The preset vibration reduction conditions can be set according to actual application requirements, such as the vibration amplitude exceeding the threshold, the vibration frequency approaching the resonant frequency, etc.

[0080] When vibration conditions are detected that meet preset damping conditions, the air pressure in the first sealed cavity of the upper bellows 11 is adjusted. Specifically, air is pumped in or out of the sealed cavity, thereby changing the air pressure within the sealed cavity. Because the upper bellows 11 is a sealed structure, changes in air pressure will cause changes in the bellows' axial stiffness and structural response characteristics, thereby optimizing damping by leveraging the linkage between the structural natural frequency and response characteristics.

[0081] In one embodiment, in order to more accurately deal with the resonance phenomenon caused when the vibration frequency is close to or coincides with the natural frequency of the system, a method is proposed. Figure 5 A schematic diagram of a process for suppressing resonance is shown, which may include the following steps:

[0082] Step S201: During the operation of the shock absorbing device, it is detected whether the vibration source device and the upper end bellows and the lower end bellows resonate with each other.

[0083] During the operation of the shock absorbing device, the vibration state of the source device and its relationship with the upper bellows 11 and the lower bellows 12 is monitored in real time to determine whether resonance occurs. This can be achieved by a detection module in the shock absorbing device. In practical applications, the identification of resonance can be based on whether the detected system vibration characteristics are consistent with the natural frequencies of the upper and lower bellows structures. Specifically, it can be manifested as the vibration frequency approaching or equal to the natural frequency of the system structure, accompanied by typical resonance phenomena such as a significant increase in vibration response, an increase in amplitude, or a stable vibration period. Due to the differences in installation position, structural dimensions, and pressure state between the upper bellows 11 and the lower bellows 12, they each have different response characteristics to the excitation frequency transmitted by the source device. Therefore, it is necessary to pay attention not only to the operating frequency of the source device itself, but also to the frequency response of the bellows system under its action, so as to accurately determine whether there is a risk of structural resonance.

[0084] Step S202: If resonance occurs, adjust the air pressure in the first sealed cavity of the upper bellows and change the length of the upper bellows to make the vibration frequency generated by the source device and the upper and lower bellows deviate from the resonance frequency.

[0085] When resonance is detected in the system, the air pressure within the first sealed chamber of the upper bellows 11 is immediately adjusted. By adjusting the air pressure within the sealed chamber, the internal pressure of the sealed chamber changes, causing the axial length of the upper bellows 11 to change. This length change directly affects the natural frequency of the entire system. Through appropriate adjustments, the system's natural frequency deviates from the vibration frequency of the source device, effectively avoiding the resonance range, reducing vibration transmission caused by resonance, and improving the shock absorption effect.

[0086] In this embodiment, in order to further explain the physical mechanism of the shock absorption control method, Figure 1 Taking the shock absorption device shown in the figure as an example, the system forces in static equilibrium state and disturbance state are modeled and analyzed in detail.

[0087] The cross-sectional area of the upper end bellows 11 is , the initial pressure is , the bellows stiffness coefficient is , the initial length is The cross-sectional area of the lower end bellows 12 is , the initial pressure is , the bellows stiffness coefficient is , the initial length is . The quality of the source equipment , in a gravitational field, subject to gravity .

[0088] In the static equilibrium state (i.e., the source equipment is not vibrating), the force balance condition is satisfied and the total force on the system is 0, specifically:

[0089] (a)

[0090] in, represents the elastic restoring force of the upper end bellows 11, represents the elastic restoring force of the lower end bellows 12, Indicates the external environmental pressure, Indicates the length of the upper bellows 11 in a static equilibrium state, Indicates the length of the lower end bellows 12 in the static equilibrium state. Assume , which means that under the action of gas pressure, the bellows will be compressed. In the equilibrium state of the system, the length changes of the upper bellows 11 and the lower bellows 12 are interrelated, so we get , , .when , and The negative sign indicates that the force is in the opposite direction. Substituting these forces into the equilibrium equation (a), we obtain:

[0091] (b)

[0092] The upper bellows 11 is sealed, and the gas satisfies the relationship between volume and pressure (ideal gas state equation):

[0093] (c)

[0094] The above equation (c) describes the state of the gas in the bellows, indicating that the gas pressure and length The relationship between them.

[0095] Combining equations (b) and (c), we can eliminate , get about The equation is:

[0096]

[0097] This equation is combined with the previous equation to obtain a value for the bellows length. The equation reflects the equilibrium state of the system and can be solved to , specific The expression is:

[0098]

[0099] Among them, based on the discriminant of the quadratic equation, we can get:

[0100]

[0101] Based on this, it shows yes and In practical applications, It can also be measured at the equilibrium position.

[0102] Further analysis shows that when the source equipment is subjected to disturbed vibration, the vibration frequency is , the amplitude is The upper bellows 11 is a sealed chamber and the pressure becomes , then:

[0103]

[0104] The stress on the intermediate source equipment during vibration is:

[0105] (d)

[0106] Subtracting the mechanical equation for the equilibrium state (a) from the mechanical equation for the vibration state (d) yields:

[0107]

[0108] Will Substituting the expression into , we can get:

[0109]

[0110] For vibration, amplitude Usually much smaller than , according to the approximate conditions of Taylor expansion, when hour, , thus it can be deduced that the system can be approximated as a spring oscillator, where the equivalent elastic coefficient is:

[0111]

[0112] The natural frequency of the system can be obtained as:

[0113]

[0114] because yes function of the natural frequency Also follow Therefore, the vibration frequency of the source equipment When the pressure changes, the pressure in the first sealed cavity of the upper bellows 11 can be adjusted. , so that the system natural frequency Keep away from external excitation frequency , effectively avoid resonance and reduce vibration transmission.

[0115] This vibration control method is particularly suitable for two typical scenarios. First, as a vibration damping structure of a fluid delivery pipeline system, its vibration frequency is It is easily affected by flow rate and pressure disturbances, so the damping control method can dynamically adjust the natural frequency. keep away , play a shock-absorbing effect; second, applied to dry low-temperature refrigerators, its natural vibration frequency is usually around 1Hz, and the second sealed cavity 12 of the lower end of the bellows is often in a vacuum state (ie ), at this time, the air pressure of the first sealing chamber of the upper end bellows 11 is dynamically adjusted , the system natural frequency can be Adjust to the principle 1Hz area, thereby effectively achieving isolation control of low-frequency vibration.

[0116] It should be noted that the shock absorption control method of this embodiment can not only be used to isolate or suppress the mechanical vibrations generated by the source device, but can also be further applied to technical scenarios that require tracking the resonant frequency to achieve a resonant response effect. In such applications, the source device is not just a device that requires shock absorption, but it is necessary to efficiently transmit vibrations of a specific frequency or frequency range to the target device to achieve functions such as resonance enhancement, resonance measurement, or excitation of specific physical processes. Specifically, in this type of implementation, the air pressure in the first sealed cavity in the upper end bellows 11 is dynamically adjusted by obtaining real-time vibration frequency information, thereby adjusting the natural frequency of the entire system to match or be close to the resonant frequency, forming a controlled resonant coupling state.

[0117] In the above embodiment, the vibration conditions of the source device and the upper bellows 11 and lower bellows 12 are detected in real time during the operation of the shock absorbing device, and when it is detected that the vibration meets the preset shock absorbing conditions, the air pressure in the first sealed chamber of the upper bellows 11 is adjusted in time, thereby changing the length of the upper bellows 11, thereby achieving dynamic regulation of the natural frequency of the system. This method can flexibly respond to different vibration states according to actual working conditions, effectively avoid shock absorption failure caused by resonance or excessive vibration amplitude, and improve the adaptability and reliability of the shock absorbing device. In this way, not only can the transmission of vibration of the source device to the target device be significantly reduced, but it can also ensure that the system is always in the best shock absorption state under different media transportation or different working conditions.

[0118] In one embodiment, a low-temperature refrigerator is provided, comprising the shock absorbing device of any of the above embodiments. The specific working principle of the shock absorbing device can be referred to the description of any of the above embodiments of the shock absorbing device, and will not be repeated here.

[0119] In one embodiment, a low-temperature refrigerator is provided, including the vibration reduction method in any of the above embodiments. The specific working process of the vibration reduction method can refer to the description of any implementation method of the above vibration reduction method, which will not be repeated here.

[0120] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0121] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0122] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A vibration damping device, used in the field of low-temperature refrigerators, for damping the vibration of the source equipment and reducing the vibration transmitted to the target equipment, characterized in that: include: A fixing structure for mounting the source device on the target device; An upper end bellows, the upper end of which is mounted on the fixed structure and the lower end of which is connected to the seismic source device; A lower end bellows, the upper end of which is connected to the source device and the lower end of which is connected to the target device, and the lower end bellows is used to transport the medium transmitted by the source device to the target device; A gas control module is connected to the inner cavity of the upper bellows and is used to control the air pressure in the upper bellows to change the length of the upper bellows so that the vibration frequency generated by the seismic source device and the upper bellows and the lower bellows deviates from the resonance frequency; wherein the seismic source device is located between the upper bellows and the lower bellows, and the upper bellows generates negative pressure inside through the gas control module, thereby sucking the seismic source device into a suspended state.

2. The shock absorbing device according to claim 1, characterized in that The upper end bellows and the lower end bellows are coaxial, and the axis is on a vertical line.

3. The shock absorbing device according to claim 2, characterized in that: The diameter of the upper end bellows is greater than the diameter of the lower end bellows.

4. The shock absorbing device according to claim 1, characterized in that: The upper end bellows has a first sealed cavity, and the lower end bellows has a second sealed cavity. The air pressure of the first sealed cavity and the air pressure of the second sealed cavity are both lower than the external environment pressure of the shock absorbing device.

5. The shock absorbing device according to claim 1, characterized in that: The fixing structure is fixed to the target device.

6. The shock absorbing device according to claim 5, characterized in that: The fixed structure includes: A mounting piece, the mounting piece is used to mount the upper end bellows; A support member is rigidly connected to the mounting member and is suitable for being fixed to the target device.

7. The shock absorbing device according to claim 6, characterized in that: A channel is provided on the fixed structure, one end of the lower end bellows is fixed to the source device, and the other end is fixed to the fixed structure, and the lower end bellows is connected to the target device through the channel.

8. The shock absorbing device according to claim 7, characterized in that: The lower end of the lower end bellows is adapted to be indirectly rigidly connected to the target device; the support member comprises: a second supporting portion, wherein an upper end of the second supporting portion is rigidly connected to the mounting member; a mounting portion, the mounting portion being rigidly connected to the lower end of the second supporting portion and being used to mount the lower end of the lower end corrugated pipe, and the mounting portion having a through hole, the through hole being directly opposite to the transmission channel of the lower end corrugated pipe; a third supporting portion, an upper end of the third supporting portion being rigidly connected to the mounting portion; A second fixing portion is rigidly connected to the lower end of the third supporting portion and is suitable for being fixed to the target device, wherein a channel is defined between the upper and lower ends of the third supporting portion, and the channel faces the through hole and the inlet of the target device.

9. The shock absorbing device according to claim 6, characterized in that: The lower end of the lower end bellows is suitable for being directly and rigidly connected to the target device; the support member comprises: a first supporting portion, wherein an upper end of the first supporting portion is rigidly connected to the mounting member; A first fixing portion is rigidly connected to a lower end of the first supporting portion and is suitable for being fixed to the target device.

10. The shock absorbing device according to claim 1, characterized in that: The fixing structure is fixed to the target device via a third device, and the fixing structure, the third device and the target device are all rigidly connected.

11. The shock absorbing device according to claim 10, characterized in that: The fixed structure includes: A mounting piece, the mounting piece is used to mount the upper end bellows; A support member is rigidly connected to the mounting member and is adapted to be fixed to the third device together with the target device.

12. The shock absorbing device according to claim 11, characterized in that: The lower end of the lower end bellows is suitable for being directly and rigidly connected to the target device; the support member comprises: a first supporting portion, wherein an upper end of the first supporting portion is rigidly connected to the mounting member; A first fixing portion is rigidly connected to a lower end of the first supporting portion and is adapted to be fixed to the third device together with the target device.

13. The shock absorbing device according to claim 1, characterized in that The shock absorbing device further comprises: A detection module, used to detect vibrations generated by the source device and the upper and lower bellows; The control module is connected to the gas control module and the detection module respectively, and is used to control the gas control module to adjust the air pressure in the upper end bellows when the vibration condition meets the preset shock absorption condition, so that the vibration frequency generated by the source equipment and the upper end bellows and the lower end bellows deviates from the resonance frequency.

14. A shock absorption method, characterized in that: Applied to the shock absorbing device according to any one of claims 1 to 13, the method comprises: During the operation of the shock absorbing device, detecting the vibration generated by the vibration source device and the upper end bellows and the lower end bellows; If the vibration condition meets the preset shock absorption condition, the air pressure of the upper end bellows is adjusted and the length of the upper end bellows is changed to reduce the vibration generated by the source device and the upper end bellows and the lower end bellows.

15. The vibration reduction method according to claim 14, wherein: The method comprises: During the operation of the shock absorbing device, detecting whether resonance occurs between the vibration source device and the upper bellows and the lower bellows; If resonance occurs, the air pressure of the upper bellows is adjusted to change the length of the upper bellows so that the vibration frequency generated by the source device and the upper bellows and the lower bellows deviates from the resonance frequency.

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