Bellows assembly and method of pressure regulation of a bellows assembly

Abstract

The present application relates to the technical field of bellows, and discloses a bellows assembly and a pressure regulating method of the bellows assembly. The bellows assembly comprises a bellows unit, a gas content detection member and a gas delivery unit. The bellows unit comprises an inner layer bellows and an outer layer bellows. The outer layer bellows is sleeved on the outer periphery of the inner layer bellows at intervals, and a containing cavity is formed between the outer layer bellows and the inner layer bellows. The gas content detection member is arranged in the containing cavity and is used for detecting the gas content in the containing cavity in real time. The gas delivery unit is communicated with the containing cavity and is used for extracting the gas in the containing cavity according to the detection result of the gas content detection member, so that the containing cavity forms a vacuum or negative pressure state, or the gas delivery unit is used for delivering the gas into the containing cavity according to the detection result of the gas content detection member, so that the containing cavity forms a positive pressure state. The bellows assembly of the present application embodiment can dynamically adjust the gas content in the containing cavity in real time, so that the bellows unit can effectively balance the internal and external pressure difference thereof.

Description

Technical Field

[0001] This invention relates to the field of bellows technology, and in particular to a bellows assembly and a method for regulating the pressure of the bellows assembly. Background Technology

[0002] Corrugated pipes, as common flexible connecting elements, are widely used in aerospace, petrochemical, vacuum equipment and other fields. They are mainly used to compensate for displacement, absorb vibration and seal connections. The working principle of corrugated pipes is to use their own elastic deformation to absorb the dimensional changes of pipelines, containers or equipment caused by thermal expansion and contraction, thereby ensuring the stable transmission of the medium inside the corrugated pipe.

[0003] However, existing bellows technology faces risks such as sealing aging and thermal insulation performance degradation when dealing with dynamic pressure differences, extreme temperature cycles, or long-term service, resulting in poor service life and performance of the bellows. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a bellows assembly that can dynamically adjust the gas content in the receiving cavity in real time, thereby adjusting the internal pressure state of the receiving cavity. This allows the bellows unit to effectively balance its internal and external pressure difference, making the bellows assembly suitable for different working conditions. This solves the technical problem in the prior art where bellows have poor service life and working performance when dealing with dynamic pressure differences, extreme temperature cycles, or long-term service.

[0005] The present invention also aims to provide a pressure regulation method for the above-mentioned bellows assembly.

[0006] According to an embodiment of the present invention, a bellows assembly includes: a bellows unit comprising an inner bellows and an outer bellows, the outer bellows being spaced around the outer periphery of the inner bellows, and a receiving cavity being formed between the outer bellows and the inner bellows; a gas content detection element disposed within the receiving cavity, the gas content detection element being used to detect the gas content within the receiving cavity in real time; and a gas delivery unit communicating with the receiving cavity, the gas delivery unit being used to extract gas from the receiving cavity according to the detection result of the gas content detection element, so as to form a vacuum or negative pressure state in the receiving cavity; or, the gas delivery unit being used to deliver gas toward the receiving cavity according to the detection result of the gas content detection element, so as to form a positive pressure state in the receiving cavity.

[0007] According to embodiments of the present invention, the bellows assembly, by configuring the bellows unit to include an inner bellows and an outer bellows, the double-layer structure (inner bellows and outer bellows) can improve the structural strength of the bellows unit, thereby improving its pressure-bearing capacity and stability to a certain extent. Simultaneously, by placing a gas content detection element within the receiving cavity, the gas content detection element can detect the gas content inside the bellows unit in real time, realizing the monitoring of the internal pressure state of the bellows unit. This allows for subsequent real-time dynamic adjustment of the gas content in the receiving cavity, thereby adjusting the internal pressure state of the receiving cavity. Furthermore, by configuring the gas delivery unit to extract or deliver gas into the receiving cavity based on the detection results of the gas content detection element, the gas content in the receiving cavity can be changed, thereby changing the internal pressure of the receiving cavity. This effectively balances the internal and external pressure difference of the bellows unit, improving its pressure-bearing capacity and extending its service life. This allows the bellows assembly to adapt to different working conditions (high temperature, high pressure, or deep sea environments, etc.). In addition, the gas delivery unit can also reduce the difficulty of gas extraction or delivery.

[0008] In some embodiments, the bellows assembly further includes a controller, which is communicatively connected to the gas content detection element. The controller is used to control the gas delivery unit to extract gas from the receiving cavity or deliver gas toward the receiving cavity based on the detection result of the gas content detection element.

[0009] In some embodiments, the gas delivery unit includes a delivery pipe, a control valve, and one of an extraction device and a replenishment device. One end of the delivery pipe is connected to the receiving cavity, and the other end of the delivery pipe is connected to either the extraction device or the replenishment device. The extraction device is used to extract gas from the receiving cavity through the delivery pipe, and the replenishment device is used to deliver gas into the receiving cavity through the delivery pipe. The control valve is communicatively connected to the controller, and the controller is used to control the opening degree of the control valve to adjust the opening degree of the delivery pipe.

[0010] In some embodiments, the bellows assembly further includes a support seal disposed at both axial ends of the bellows unit, wherein the inner bellows and the outer bellows are both fixedly connected to the support seal, and at least a portion of the delivery pipe is integrated within the support seal.

[0011] In some embodiments, the gas content detection element is fixedly connected to the support seal.

[0012] In some embodiments, the bellows assembly further includes a getter pack disposed within the receiving cavity, the getter pack being used to adsorb gas within the receiving cavity to maintain the gas content of the receiving cavity.

[0013] In some embodiments, the inner wall of the receiving cavity is provided with a heat radiation suppressor, which is a metal plating layer, and the metal plating layer is a silver layer or a polytetrafluoroethylene layer.

[0014] In some embodiments, the inner surface of the inner corrugated pipe is provided with a corrosion-resistant and heat-insulating component; and / or, the outer surface of the outer corrugated pipe is provided with a reflective component.

[0015] In some embodiments, the corrosion-resistant and heat-insulating component includes a polytetrafluoroethylene component and a ceramic composite component stacked sequentially, and the reflective component is an aluminum foil component.

[0016] In some embodiments, the bellows assembly further includes a support unit, which is sleeved on the outer periphery of the inner bellows and connected between the inner bellows and the outer bellows.

[0017] In some embodiments, the support unit includes a first support ring, a heat insulation ring, and a second support ring. The first support ring is sleeved on the outer periphery of the inner corrugated pipe. Both the heat insulation ring and the second support ring include two rings. The two second support rings are respectively disposed on the radial sides of the first support ring. The two second support rings are respectively fixedly connected to the inner corrugated pipe and the outer corrugated pipe. The two heat insulation rings are respectively disposed between the first support ring and the second support ring.

[0018] In some embodiments, the first support ring is a shape memory alloy support ring; and / or, the second support ring is a metal ring.

[0019] In some embodiments, the heat insulation ring includes a first heat insulation ring and a second heat insulation ring, the first heat insulation ring and the second heat insulation ring being sequentially fitted together along the radial direction of the support unit, and one of the first heat insulation ring and the second heat insulation ring being formed as a heat insulation buffer ring.

[0020] In some embodiments, the support unit includes a plurality of support units, which are arranged at intervals along the axial direction of the bellows unit.

[0021] According to an embodiment of the present invention, a pressure regulating method for a bellows assembly, wherein the bellows assembly is the aforementioned bellows assembly, the pressure regulating method for the bellows assembly includes the following steps: detecting the gas content in the receiving cavity using a gas content detector; controlling the gas delivery unit to extract gas from the receiving cavity based on the detection result of the gas content detector; or, controlling the gas delivery unit to deliver gas toward the receiving cavity based on the detection result of the gas content detector.

[0022] According to the pressure regulation method of the bellows assembly of the present invention, based on the aforementioned bellows assembly, the pressure of the receiving cavity can be effectively and in real time, thereby balancing the internal and external pressure difference of the bellows unit, ensuring the working performance of the bellows assembly, and thus enabling the bellows assembly to adapt to different working conditions.

[0023] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention. Attached Figure Description

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0025] Figure 1 This is a cross-sectional view of a bellows assembly according to some embodiments of the present invention;

[0026] Figure 2 for Figure 1 A magnified view of region I in the middle;

[0027] Figure 3 This is a side view of a support unit according to some embodiments of the present invention;

[0028] Figure 4 for Figure 3 Sectional view along line AA;

[0029] Figure 5 This is a flowchart of a pressure regulation method for a bellows assembly according to some embodiments of the present invention.

[0030] Figure label:

[0031] 1000, Bellows assembly;

[0032] 100. Bellows unit; 110. Inner bellows; 120. Outer bellows; 130. Receiving cavity;

[0033] 200. Gas content detection device;

[0034] 300. Gas delivery unit; 310. Delivery pipe; 320. Control valve;

[0035] 400. Controller;

[0036] 500. Support seals;

[0037] 600. Getter pack;

[0038] 700, Support Unit;

[0039] 710. First support ring;

[0040] 720. Heat insulation ring; 721. First heat insulation ring; 722. Second heat insulation ring;

[0041] 730. Second support ring. Detailed Implementation

[0042] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0043] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] The bellows assembly 1000 of the present invention is described below with reference to the accompanying drawings.

[0045] like Figure 1 As shown, a bellows assembly 1000 according to an embodiment of the present invention includes: a bellows unit 100, a gas content detection element 200, and a gas delivery unit 300.

[0046] Among them, such as Figure 1 As shown, the bellows unit 100 includes an inner bellows 110 and an outer bellows 120. The outer bellows 120 are spaced around the outer periphery of the inner bellows 110, and a receiving cavity 130 is formed between the outer bellows 120 and the inner bellows 110. In other words, the bellows unit 100 of this application consists of two structural components (inner bellows 110 and outer bellows 120). The cooperation between the inner bellows 110 and the outer bellows 120 facilitates the improvement of the structural strength of the bellows unit 100, improves the pressure-bearing capacity and stability of the bellows unit 100 to a certain extent, significantly reduces the risk of the bellows unit 100 bursting, ensures the working performance of the bellows unit 100, and extends the service life of the bellows unit 100.

[0047] Meanwhile, compared with traditional single-layer bellows, the double-layer (inner bellows 110 and outer bellows 120) bellows unit 100 of this application has stronger pressure resistance and explosion resistance, and the double-layer bellows unit 100 has higher sealing performance and safety. Even if the inner bellows 110 is damaged by accident, the outer bellows 120 can still temporarily block the leakage of the medium, buy time for maintenance, and reduce the risk of safety accidents to a certain extent.

[0048] like Figure 1 As shown, a gas content detection element 200 is disposed within the receiving cavity 130. The gas content detection element 200 is used to detect the gas content within the receiving cavity 130 in real time. This enables the monitoring of the internal pressure state of the receiving cavity 130, allowing for real-time dynamic adjustment of the gas content within the receiving cavity 130, thereby adjusting the internal pressure state of the receiving cavity 130.

[0049] Simultaneously, the pressure value detected within the containment cavity 130 can be used to determine whether the internal medium of the bellows unit 100 is leaking, ensuring the safety of the bellows unit 100 and reducing the maintenance cost of the bellows assembly 1000. Without the gas content detection element 200, it would be impossible to directly determine whether the internal medium of the bellows unit 100 is leaking, requiring significant time and manpower for inspection. However, by using the gas content detection element 200, the change in the detected value can directly determine whether the internal medium of the bellows unit 100 is leaking, saving considerable time and manpower costs, thereby reducing the maintenance cost of the bellows assembly 1000.

[0050] In summary, compared to existing bellows which lack a detection mechanism and cannot sense the internal pressure state in real time, this application, by placing a gas content detector 200 inside the receiving cavity 130, can detect the gas content inside the receiving cavity 130 in real time. This facilitates dynamic adjustment of the pressure state of the receiving cavity 130 based on the detection results of the gas content detector 200. Furthermore, it can also promptly detect whether there is a medium leak based on the detection results of the gas content detector 200, so as to facilitate timely maintenance of the bellows unit 100 and reduce the maintenance time and cost of the bellows assembly 1000.

[0051] Combination Figure 1 and Figure 2As shown, the gas delivery unit 300 is connected to the receiving cavity 130. The gas delivery unit 300 is used to extract gas from the receiving cavity 130 according to the detection result of the gas content detection element 200, so that the receiving cavity 130 forms a vacuum or negative pressure state; or, the gas delivery unit 300 is used to deliver gas into the receiving cavity 130 according to the detection result of the gas content detection element 200, so that the receiving cavity 130 forms a positive pressure state. In other words, the gas delivery unit 300 of this application can be used to extract gas from the receiving cavity 130 or to deliver gas into the receiving cavity 130, thereby changing the gas content in the receiving cavity 130 and enabling the receiving cavity 130 to be in different states (vacuum, negative pressure, or positive pressure). This allows the receiving cavity 130 to decompose the internal and external pressures of the bellows unit 100 into multiple smaller pressure differential steps, thereby reducing the pressure difference between the receiving cavity 130 and the inner bellows 110, as well as the pressure difference between the receiving cavity 130 and the outer bellows 120. This results in minimal pressure on the inner bellows 110 and the outer bellows 120, effectively balancing the internal and external pressure differences of the bellows unit 100, preventing the bellows unit 100 from collapsing, improving the working performance of the bellows unit 100, and broadening the applicable environment and working conditions of the bellows unit 100.

[0052] It should be noted that, in the actual application of the bellows unit 100, the gas delivery unit 300 can be configured to extract gas from the receiving cavity 130 according to the detection result of the gas content detection element 200, depending on the application scenario of the bellows unit 100; or, the gas delivery unit 300 can be configured to deliver gas into the receiving cavity 130 according to the detection result of the gas content detection element 200.

[0053] Specifically, when the bellows unit 100 is used to transport liquefied natural gas (LNG), during the start-up and shutdown of the LNG pipeline system, the pressure inside the inner bellows 110 of the bellows unit 100 will suddenly rise from atmospheric pressure to 12 MPa. If the pressure inside the containment cavity 130 is not adjusted, the pressure inside the containment cavity 130 will be approximately atmospheric pressure, i.e., 0.1 MPa. At this time, the pressure difference borne by the inner bellows 110 is 12 MPa. To reduce the pressure difference borne by the inner bellows 110, the gas delivery unit 300 of the bellows unit 100 can be configured to be used for detection based on the gas content detection element 200. The measured results are directed to the receiving cavity 130 to increase the internal pressure of the receiving cavity 130, so that the internal pressure of the receiving cavity 130 is between 0.1MPa and 12MPa. In a specific example, the internal pressure of the receiving cavity 130 can be adjusted to between 5MPa and 6MPa. At this time, the pressure difference borne by the inner bellows 110 can be reduced from 12MPa to 6MPa-7MPa, so that the stress concentration factor of the inner bellows 110 is reduced by about 40%, and the crest deformation of the inner bellows 110 can be controlled within 0.5mm, thereby reducing the risk of weld cracking of the inner bellows 110.

[0054] In a specific example, when the bellows unit 100 is used to transport liquefied natural gas (LNG), the internal pressure of the inner bellows 110 is 12 MPa during the start-up and shutdown of the LNG pipeline system. At this time, the gas delivery unit 300 can be controlled to deliver gas toward the receiving cavity 130 to adjust the pressure in the receiving cavity 130 to 5 MPa, so that the pressure difference between the inner bellows 110 and the receiving cavity 130 can be controlled at about 7 MPa. At this time, the pressure difference between the outer bellows 120 and the receiving cavity 130 is about 5 MPa, thus achieving the purpose of reducing the pressure difference borne by the inner bellows 110 from 12 MPa to 6 MPa-7 MPa.

[0055] In summary, the internally pressure-adjustable accommodating cavity 130 of this application can decompose the internal and external pressures of the bellows unit 100 into multiple smaller pressure differential steps.

[0056] When the bellows unit 100 of this application is used in deep-sea or high-pressure scenarios for transporting gas, oil, etc., the pressure inside the inner bellows 110 will increase during transportation. Therefore, the gas delivery unit 300 of the bellows unit 100 can also be configured to deliver gas toward the receiving cavity 130 according to the detection result of the gas content detection element 200.

[0057] Specifically, the pressure inside the receiving cavity 130 can be adjusted by injecting an inert gas (such as nitrogen or argon) into the receiving cavity 130 through the gas delivery unit 300.

[0058] When the bellows unit 100 of this application is used for vacuuming, the pressure inside the inner bellows 110 of the bellows unit 100 will drop sharply. If the pressure inside the receiving cavity 130 is not adjusted, the pressure inside the receiving cavity 130 will be approximately atmospheric pressure, i.e., 0.1 MPa. At this time, the pressure difference borne by the inner bellows 110 is relatively large. In order to reduce the pressure difference borne by the inner bellows 110, the gas delivery unit 300 of the bellows unit 100 can be configured to extract gas from the receiving cavity 130 according to the detection result of the gas content detection element 200, so as to reduce the internal pressure of the receiving cavity 130, so that the internal pressure of the receiving cavity 130 is between the internal pressure of the inner bellows 110 and the external pressure of the outer bellows 120, thereby reducing the pressure difference borne by the inner bellows 110 and meeting the requirements for long-term service.

[0059] In the above embodiment, after the cavity 130 is designed to be under negative pressure, the inner bellows 110 is used to transport the medium, the outer bellows 120 is exposed to the atmosphere, and the cavity 130 is evacuated to a near-vacuum state, thereby forming a pressure difference step from vacuum to near-vacuum to atmosphere.

[0060] In the above embodiment, after the gas delivery unit 300 extracts the gas from the receiving cavity 130, the gas content in the receiving cavity 130 will also increase due to gas release or micro-leakage of the medium. When the gas content detection device 200 detects that it has risen to more than 1 Pa, the gas delivery unit 300 can be used again to extract the gas from the receiving cavity 130, so that the receiving cavity 130 is kept in a vacuum state. On the one hand, this reduces the pressure difference borne by the inner bellows 110, and on the other hand, the vacuum environment can effectively eliminate gas convection and conduction heat transfer, giving the bellows unit 100 an extremely low thermal conductivity, maximizing the blocking of energy transfer (such as heat) or preventing cross-contamination of the medium, and ensuring the working performance of the bellows unit 100.

[0061] Furthermore, when the cavity 130 is kept in a vacuum state, it can effectively block the propagation of sound, thereby giving the bellows unit 100 excellent sound insulation performance, which makes the bellows unit 100 suitable for occasions with extremely high noise control requirements.

[0062] In summary, the bellows assembly 1000 of this application not only has a double layer, but also can control the interlayer pressure to effectively balance the internal and external pressure difference, thereby improving the pressure bearing capacity of the bellows assembly 1000. This enables the bellows assembly 1000 to adapt to high pressure or high vacuum environments and improves the working performance of the bellows assembly 1000.

[0063] As can be seen from the above structure, the corrugated pipe assembly 1000 of the present invention, by setting the corrugated pipe unit 100 to include an inner corrugated pipe 110 and an outer corrugated pipe 120, can improve the structural strength of the corrugated pipe unit 100 by utilizing the cooperation of the outer corrugated pipe 120 and the inner corrugated pipe 110, and to a certain extent improve the pressure-bearing capacity and stability of the corrugated pipe unit 100, and significantly reduce the risk of the corrugated pipe unit 100 bursting.

[0064] Meanwhile, by setting up a gas content detection device 200 to detect the gas content in the accommodating cavity 130 in real time, not only can the internal pressure status of the bellows unit 100 be monitored in real time, but the safety of the bellows unit 100 in use can also be ensured, and the maintenance cost of the bellows assembly 1000 can be reduced.

[0065] Furthermore, by configuring the gas delivery unit 300 to connect to the receiving cavity 130, and using the gas delivery unit 300 to extract gas from the receiving cavity 130 or to deliver gas into the receiving cavity 130, the gas content of the receiving cavity 130 can be changed, thereby achieving dynamic adjustment of the gas pressure state inside the receiving cavity 130. This allows the receiving cavity 130 to be in a vacuum or negative pressure state, or in a positive pressure state, thereby balancing the internal and external pressure difference of the bellows unit 100. This enables the bellows unit 100 to adapt to different working conditions, thereby broadening the applicable environment range of the bellows assembly 1000.

[0066] It is understandable that, compared with the prior art, this application can dynamically adjust the internal pressure state of the receiving cavity 130 to achieve the purpose of balancing the internal and external pressure difference of the bellows unit 100, so that the bellows unit 100 can adapt to different working environments.

[0067] In some embodiments, the corrugated pipe unit 100 may be made of polyvinyl chloride, polypropylene, or stainless steel. Since polyvinyl chloride, polypropylene, or stainless steel have certain structural strength and high temperature resistance, the corrugated pipe unit 100 can simultaneously take into account both structural strength and high temperature resistance.

[0068] In a specific example, both the inner bellows 110 and the outer bellows 120 are made of stainless steel by hydroforming or slat welding, so that the bellows unit 100 has both structural strength and high temperature resistance.

[0069] In some embodiments, the inner corrugated pipe 110 and the outer corrugated pipe 120 adopt different wall thicknesses or wave pitches, which can adjust the structural strength and flexibility of the inner corrugated pipe 110 and the outer corrugated pipe 120. Without increasing the overall weight and cost, the material can be "allocated on demand", and the wall thickness or wave pitch of the inner corrugated pipe 110 and the outer corrugated pipe 120 can be rationally designed, thereby maximizing the compressive strength of the inner corrugated pipe 110 or the outer corrugated pipe 120, while maintaining the flexibility of the inner corrugated pipe 110 and the outer corrugated pipe 120.

[0070] In a specific example, since the force on the inner bellows 110 is greater than that on the outer bellows 120, the thickness of the outer bellows 120 can be set to 1 / 3 of the thickness of the inner bellows 110 to reduce the manufacturing cost of the outer bellows 120.

[0071] In some embodiments, the gas content detection device 200 includes a vacuum gauge and a pressure sensor. When a negative pressure or vacuum environment is formed inside the containment cavity 130, the vacuum gauge is used to detect the gas pressure inside the containment cavity 130. When a positive pressure is formed inside the containment cavity 130, the pressure sensor is used to detect the gas pressure inside the containment cavity 130, so as to collect the pressure status inside the containment cavity 130 and facilitate subsequent dynamic adjustment of the gas content in the containment cavity 130.

[0072] In some embodiments, such as Figure 1 As shown, the bellows assembly 1000 also includes a controller 400, which is communicatively connected to the gas content detector 200. The controller 400 is used to control the gas delivery unit 300 to extract gas from the receiving cavity 130 or deliver gas into the receiving cavity 130 based on the detection result of the gas content detector 200. In other words, the controller 400 receives signal information from the gas content detector 200 and controls the operation of the gas delivery unit 300, so that the gas delivery unit 300 can extract gas from the receiving cavity 130 according to the detection result of the gas content detector 200 to create a vacuum or negative pressure state in the receiving cavity 130; or, it can deliver gas into the receiving cavity 130 according to the detection result of the gas content detector 200 to create a positive pressure state in the receiving cavity 130, thereby achieving the purpose of balancing the pressure difference inside and outside the bellows unit 100 and reducing the control difficulty of the gas delivery unit 300.

[0073] In summary, by setting the controller 400 and the gas content detection element 200 to a communication connection, this application can realize the intelligentization and digitalization of the bellows assembly 1000, and achieve predictive maintenance of the bellows assembly 1000.

[0074] This application also supports IoT access.

[0075] In a specific example, the gas content detection device 200 can monitor the pressure status of the containment cavity 130 in real time. When a pinhole leak occurs in the inner bellows 110, causing the medium to seep into the containment cavity 130, the gas content in the containment cavity 130 will surge to more than 10 times. After detecting the abnormal value, the gas content detection device 200 transmits the abnormal value to the controller 400. Once the controller 400 receives the abnormal signal detected by the gas content detection device 200, it will immediately issue a fault warning and send a fault signal to the remote monitoring center through the wireless module in the controller 400. The warning response time is less than 10 seconds. After receiving the fault warning, the remote monitoring center can discover the hidden dangers of the bellows assembly 1000 several days in advance and carry out maintenance, thereby improving the maintenance convenience of the bellows assembly 1000 and avoiding safety accidents of the bellows assembly 1000, ensuring the safety of the bellows unit 100 in use.

[0076] In some embodiments, combined with Figure 1 and Figure 2 As shown, the gas delivery unit 300 includes a delivery pipe 310, a control valve 320, and one of a vacuum device or a gas replenishment device. One end of the delivery pipe 310 is connected to the receiving cavity 130, and the other end is connected to either the vacuum device or the gas replenishment device. The vacuum device is used to extract gas from the receiving cavity 130 through the delivery pipe 310, and the gas replenishment device is used to deliver gas into the receiving cavity 130 through the delivery pipe 310. Specifically, when the gas delivery unit 300 extracts gas from the receiving cavity 130, the gas delivery unit 300 includes the delivery pipe 310, the control valve 320, and the vacuum device (not shown in the figure). The vacuum device is used to extract gas from the receiving cavity 130 to create a vacuum or negative pressure state in the receiving cavity 130. When the gas delivery unit 300 delivers gas into the receiving cavity 130, the gas delivery unit 300 includes the delivery pipe 310, the control valve 320, and the gas replenishment device (not shown in the figure). The gas replenishment device is used to deliver gas into the receiving cavity 130 to create a positive pressure state in the receiving cavity 130.

[0077] The delivery pipe 310 reduces the difficulty for the gas delivery unit 300 to extract gas from or deliver gas into the receiving cavity 130, provides a gas guiding path, and ensures smooth gas flow.

[0078] Meanwhile, the control valve 320 can be used to control the flow rate of gas, so as to flexibly adjust the extraction rate or delivery rate of gas in the receiving cavity 130. It can also control the opening and closing of the delivery pipe 310 to adjust the gas content in the receiving cavity 130 and achieve the purpose of adjusting the internal pressure state of the receiving cavity 130 in real time.

[0079] In some embodiments, the control valve 320 is communicatively connected to the controller 400, which controls the opening of the control valve 320 to adjust the opening of the delivery pipe 310. This allows for the adjustment of the gas flow rate in the delivery pipe 310. By configuring the control valve 320 and the controller 400 to communicate, automated closed-loop control is achieved. This avoids judgment errors and operational delays during manual on-site operation, as well as errors caused by environmental interference (such as the inability to precisely adjust the control valve 320 at close range under high temperature and high pressure conditions), thereby improving the accuracy of the controller 400's adjustment and control of the opening of the delivery pipe 310.

[0080] In some embodiments, the control valve 320 is a miniature electronically controlled regulating valve.

[0081] In a specific example, the opening of the control valve 320 can be adjusted by the online control controller 400 of the remote monitoring center, so that when the gas delivery unit 300 draws gas from the receiving cavity 130 or delivers gas to the receiving cavity 130, the amount of gas flow in the delivery pipe 310 can be adjusted without disassembling the pipe.

[0082] Optionally, the volume of the controller 400 is ≤50cm². 3 (Compatible with small and medium diameter corrugated pipes), using a low-power chip (standby current <10mA), it can be powered by a battery or a solar panel installed outside the corrugated pipe unit 100 to meet the needs of long-term outdoor or deep-sea use.

[0083] In some embodiments, such as Figure 1 As shown, the bellows assembly 1000 also includes a support seal 500, which is disposed at both axial ends of the bellows unit 100. The inner bellows 110 and the outer bellows 120 are both fixedly connected to the support seal 500, and at least a portion of the delivery pipe 310 is integrated within the support seal 500. By fixing the inner bellows 110 and the outer bellows 120 to the support seal 500, the support seal 500 can stably support the inner bellows 110 and the outer bellows 120. On the other hand, the support seal 500 can seal the inner bellows 110 and the outer bellows 120, forming an absolutely sealed cavity 130 to a certain extent. This prevents external impurities (gas, dust, and moisture, etc.) from entering the cavity 130, thereby ensuring the internal pressure of the cavity 130.

[0084] Meanwhile, by integrating at least part of the delivery pipe 310 into the support seal 500, the difficulty of the gas delivery unit 300 in extracting or delivering gas can be reduced, and the support seal 500 can also be used to support the delivery pipe 310, ensuring the positional stability of the delivery pipe 310.

[0085] In a specific example, the support seal 500 is an end cap flange made of stainless steel.

[0086] In some embodiments, the support seal 500 is provided with a channel forming a delivery pipe 310 to integrate at least a portion of the delivery pipe 310 within the support seal 500.

[0087] In some embodiments, the end cover flange is sealed to the inner bellows 110 and the outer bellows 120 by argon arc welding, ensuring the reliability of the welds between the end cover flange and the inner bellows 110 and the outer bellows 120, thereby ensuring the permanent static seal of the accommodating cavity 130.

[0088] In some embodiments, such as Figure 1 As shown, the gas content detection element 200 is fixedly connected to the support seal 500. The support seal 500 supports the gas content detection element 200, ensuring the positional stability of the gas content detection element 200 and facilitating its operation.

[0089] Optionally, the gas content detection element 200 and the supporting seal element 500 can be fixedly connected by welding, bonding or screwing.

[0090] In some embodiments, combined with Figure 1 and Figure 2 As shown, the bellows assembly 1000 also includes a getter pack 600, which is disposed within the receiving cavity 130. The getter pack 600 is used to adsorb gas within the receiving cavity 130 to maintain the pressure within the receiving cavity 130. This improves the working performance of the bellows unit 100 and extends the service life of the bellows assembly 1000 to a certain extent.

[0091] It should be noted that when the bellows unit 100 is made of stainless steel, stainless steel will release gases such as hydrogen (H2) and carbon dioxide (CO2) during long-term operation. The getter pack 600 of this application can adsorb gases such as H2 and CO2, and work with the gas delivery unit 300 to extract the gas in the receiving cavity 130. In this way, when it is necessary to maintain a vacuum state in the receiving cavity 130, the gas content in the receiving cavity 130 can be stably maintained at 1×10 -2 The Pa level allows the bellows unit 100 to have a service life of more than 5 years, which is more than 2.5 times longer than the service life of the existing "one-time sealing" bellows structure (1-2 years), greatly improving the working performance and market competitiveness of the bellows unit 100.

[0092] At the same time, the getter pack 600 also ensures that the pressure in the receiving cavity 130 can always be maintained within a specific range after the gas content in the gas delivery unit 300 is adjusted.

[0093] In a specific example, the getter pack 600 contains a zirconium-aluminum alloy getter, which can efficiently adsorb residual gases in the environment and maintain the pressure state of the containment cavity 130.

[0094] In some embodiments, a heat radiation suppressor (not shown in the figure) is provided on the inner wall of the receiving cavity 130. The heat radiation suppressor is a metal plating layer, which is a silver layer or a polytetrafluoroethylene layer. The heat radiation suppressor can greatly block the heat radiation transfer between the inner bellows 110 and the outer bellows 120, enhance the heat insulation effect of the bellows unit 100, and prevent the temperature of the medium inside the inner bellows 110 from being excessively lost or increased due to radiative heat transfer, which is conducive to the stable transport of the medium.

[0095] It should be noted that during long-term use, the bellows unit 100 will release gas, resulting in some gas remaining in the receiving cavity 130. Especially when the receiving cavity 130 needs to maintain a vacuum state, this gas will accelerate the heat radiation transfer speed between the inner bellows 110 and the outer bellows 120, causing the bellows unit 100 to overheat. In order to ensure that the bellows unit 100 and the medium transported by the bellows unit 100 are within the normal operating temperature range, this application provides a heat radiation suppression component on the inner wall of the receiving cavity 130. The heat radiation suppression component can reflect or absorb this part of the radiation energy, thereby directly cutting off the heat exchange path and keeping the medium within the normal operating temperature range.

[0096] Meanwhile, when the heat radiation suppressor is a silver layer, since silver is one of the metals with the highest heat radiation reflectivity in nature, it can reflect more than 90% of infrared heat radiation. The heat radiation suppressor formed by the silver layer can block the radiative heat exchange between the inner bellows 110 and the outer bellows 120 to the greatest extent, thereby improving the heat insulation effect of the cavity 130.

[0097] In addition, when the heat radiation suppressor is a polytetrafluoroethylene layer, the surface of the polytetrafluoroethylene layer is smooth and has a certain heat radiation blocking ability, which enables the heat radiation suppressor to reduce the radiative heat exchange between the inner corrugated pipe 110 and the outer corrugated pipe 120, thus ensuring the heat insulation effect of the receiving cavity 130.

[0098] In some embodiments, the inner surface of the inner bellows 110 is provided with a corrosion-resistant and heat-insulating component (not shown in the figure). The corrosion-resistant and heat-insulating component has the dual ability to isolate heat transfer and resist the corrosion of the inner bellows 110 by the medium. It can reduce the corrosion rate of the medium on the inner surface of the inner bellows 110 and reduce the heat exchange between the medium and the inner surface of the inner bellows 110, thus ensuring the working performance of the inner bellows 110 and making the bellows unit 100 adaptable to scenarios with extreme temperature differences.

[0099] In some embodiments, the outer surface of the outer corrugated pipe 120 is provided with a reflective element (not shown in the figure). This can reflect thermal radiation from the external environment (such as sunlight, radiation from high-temperature equipment, etc.), preventing heat from the outer corrugated pipe 120 from being transferred to the interior of the inner corrugated pipe 110 through the receiving cavity 130, thereby further improving the overall heat insulation effect of the corrugated pipe unit 100. While ensuring that the corrugated pipe unit 100 is not greatly affected by the heat from thermal radiation, it can also ensure the temperature stability of the medium inside the corrugated pipe unit 100.

[0100] In some embodiments, the corrosion-resistant and heat-insulating component includes a polytetrafluoroethylene component and a ceramic composite component stacked sequentially, and the reflective component is an aluminum foil component. This arrangement improves the heat insulation system of the corrugated pipe unit 100.

[0101] Specifically, the reflective elements and the anti-corrosion and heat insulation elements complement each other, realizing the "prevention of external heat entering the interior" and "resistance of internal heat radiation" of the corrugated pipe unit 100, thereby improving the overall heat insulation effect of the corrugated pipe unit 100 and the temperature stability of the medium.

[0102] Of course, in other embodiments, the anti-corrosion and heat insulation components can also be polyimide components or aerogel, etc. Polyimide components or aerogel also have the functions of anti-corrosion and heat insulation. The reflective components can also be silver-plated film components or stainless steel components, etc., to a certain extent ensure the reflectivity of the reflective components and reduce the influence of heat radiation from the external environment on the outer corrugated pipe 120.

[0103] In some examples, a 0.1mm-0.2mm thick polytetrafluoroethylene-ceramic composite coating can be sprayed onto the inner wall of the inner bellows 110 to achieve the purpose of setting up anti-corrosion and heat insulation components on the inner surface of the inner bellows 110. This can reduce the corrosion rate of the medium (such as natural gas, corrosive liquids, etc.) on the pipe wall of the inner bellows 110 (to below 0.01mm / year) and reduce the heat exchange between the medium and the pipe wall of the inner bellows 110.

[0104] It should be noted that in a deep-sea high-salt environment (salinity of 3.5%), the corrosion rate of the corrugated pipe unit 100 with a polytetrafluoroethylene-ceramic composite coating is 0.01 mm / year. Compared with the existing corrugated pipes made only of stainless steel with a corrosion rate of 0.1 mm / year, the corrosion rate of the corrugated pipe unit 100 of this application is reduced by about 10 times. At the same time, the service life of the corrugated pipe unit 100 can be extended to more than 15 years, thus extending the service life of the corrugated pipe unit 100 and making the corrugated pipe unit 100 applicable to a wide range of environments.

[0105] In other examples, a reflective element is installed on the outer surface of the outer corrugated pipe 120 by wrapping a 0.05mm-0.1mm thick aluminum foil reflective layer around the outer wall of the outer corrugated pipe 120. The reflectivity of the aluminum foil reflective layer is ≥90%, thereby suppressing more than 70% of radiative heat transfer from the outside of the outer corrugated pipe 120, significantly reducing the impact of external heat from the outer corrugated pipe 120 on the inner corrugated pipe 110.

[0106] In some embodiments, such as Figure 1 As shown, the bellows assembly 1000 also includes a support unit 700, which is sleeved on the outer periphery of the inner bellows 110 and connected between the inner bellows 110 and the outer bellows 120. The support unit 700 stably supports the inner bellows 110 and the outer bellows 120 and fixes their relative positions, thereby ensuring the structural strength and positional stability of the bellows assembly 100. To a certain extent, this can prevent the inner bellows 110 and the outer bellows 120 from being crushed when the outer bellows 120 is subjected to external forces (such as installation tension, environmental compression, etc.) or when the inner bellows 110 is subjected to medium pressure, thus ensuring the working performance of the bellows assembly 100.

[0107] In some embodiments, combined with Figure 1 , Figure 3 and Figure 4 As shown, the support unit 700 includes a first support ring 710, a heat insulation ring 720, and a second support ring 730. The first support ring 710 is sleeved on the outer periphery of the inner corrugated pipe 110. Two heat insulation rings and two support rings 730 are each included, with the two second support rings 730 respectively located on the radial sides of the first support ring 710. The two second support rings 730 are fixedly connected to the inner corrugated pipe 110 and the outer corrugated pipe 120, respectively. The two heat insulation rings 720 are respectively located between the first support ring 710 and the second support ring 730. The heat insulation ring 720 blocks the heat conduction path between the first support ring 710 and the second support ring 730, further preventing the support unit 700 from directly contacting the corrugated pipe unit 100 and forming a thermal bridge, which is beneficial for maintaining a stable temperature of the medium transported inside the corrugated pipe unit 100.

[0108] Specifically, by placing two second support rings 730 on the radial sides of the first support ring 710, the first support ring 710 supports the second support ring 730, ensuring the structural strength and positional stability of the support unit 700. Furthermore, the two second support rings 730 support each other with the inner corrugated pipe 110 and the outer corrugated pipe 120, respectively, thereby improving the positional stability of the support unit 700 and the corrugated pipe unit 100 and reducing the connection difficulty between the support unit 700 and the corrugated pipe unit 100.

[0109] In the description of this invention, features defined as "first" and "second" may explicitly or implicitly include one or more of the features, used to distinguish and describe features, without any order or importance.

[0110] In some embodiments, the second support ring 730 can be fixedly connected to the inner corrugated pipe 110 and the outer corrugated pipe 120 by means of welding or bonding.

[0111] In some embodiments, the first support ring 710 is a shape memory alloy support ring. It should be noted that shape memory alloy refers to an alloy that can be compressed or folded at room temperature (for easy installation), and automatically returns to a pre-designed annular support shape when the bellows unit 100 is in operation (when the temperature rises or falls to its phase transition temperature).

[0112] Therefore, by setting the first support ring 710 as a shape memory alloy support ring, the "shape memory effect" of the shape memory alloy support ring can be utilized to enable the first support ring 710 to automatically restore the preset support shape at a specific temperature, thereby providing a stable and adaptive support force for the structure of the bellows unit 100 and effectively preventing the bellows unit 100 from becoming unstable under high temperature and high pressure differential.

[0113] In a specific example, the first support ring 710 is tightly fitted between the two second support rings 730 to achieve the purpose of placing the first support ring 710 between the inner bellows 110 and the outer bellows 120, forming a uniform support force. Even if temperature fluctuations cause slight deformation of the inner bellows 110 and the outer bellows 120, the shape memory alloy support ring can finely adjust its shape with temperature changes, always maintaining the spatial stability between the inner bellows 110 and the outer bellows 120, thus avoiding the problem of traditional support components failing due to temperature stress.

[0114] It should also be noted that traditional rigid support rings require precise alignment for installation, which is difficult to operate in confined spaces or complex pipeline layouts. In contrast, shape memory alloy support rings can be compressed to a smaller size at room temperature and easily placed into the receiving cavity 130. Moreover, the shape memory alloy support rings can automatically unfold and complete the support and positioning of the bellows unit 100 simply by heating with the medium temperature or triggering with the ambient temperature, which can significantly reduce installation time and labor costs.

[0115] In addition, because shape memory alloys have excellent corrosion resistance, fatigue resistance and mechanical strength, they can adapt to high temperature, low temperature or corrosive media environments, so that the first support ring 710 can withstand extreme working conditions and can extend the service life of the first support ring 710 to a certain extent, so that the first support ring 710 can continuously provide stable support force to the bellows unit 100.

[0116] Optionally, the shape memory alloy support ring can be made of nickel-titanium alloy or copper-zinc-aluminum alloy, etc.

[0117] In a specific example, the shape memory alloy support ring is a shape memory nickel-titanium alloy support ring. The shape memory nickel-titanium alloy support ring can provide basic support for the bellows unit 100 at room temperature. When the temperature rises, the radial dimension of the shape memory nickel-titanium alloy support ring will automatically increase, thereby providing stronger support for the bellows unit 100 and effectively improving the instability resistance of the large-diameter bellows unit 100 under high temperature difference and high pressure difference.

[0118] In some embodiments, the second support ring 730 is a metal ring. It can provide stable rigid support for the bellows unit 100 and ensure the positional stability of the bellows unit 100.

[0119] In a specific example, the second support ring 730 is made of stainless steel. Since the bellows unit 100 is also made of stainless steel, the second support ring 730 and the bellows unit 100 are made of the same material, so that the second support ring 730 and the bellows unit 100 can be welded together, thereby ensuring the reliability of the connection between the second support ring 730 and the bellows unit 100.

[0120] In some embodiments, such as Figure 4 As shown, the heat insulation ring 720 includes a first heat insulation ring 721 and a second heat insulation ring 722. The first heat insulation ring 721 and the second heat insulation ring 722 are sequentially fitted together along the radial direction of the support unit 700. One of the first heat insulation ring 721 and the second heat insulation ring 722 is formed as a heat insulation buffer ring. While ensuring that the heat insulation ring 720 can isolate heat transfer between the inner bellows 110 and the outer bellows 120, the heat insulation buffer ring also buffers the vibration impact between the bellows unit 100 and the support unit 700, thereby reducing the impact of vibration on the bellows unit 100 and ensuring the working performance of the bellows unit 100.

[0121] It should be noted that, when one of the first heat insulation ring 721 and the second heat insulation ring 722 is formed as a heat insulation buffer ring, it means that the first heat insulation ring 721 is formed as a heat insulation buffer ring; or, the second heat insulation ring 722 is formed as a heat insulation buffer ring. The heat insulation buffer ring not only serves as heat insulation, but also buffers the vibration and impact between the bellows unit 100 and the support unit 700, reducing the impact of external impact and vibration forces on the bellows unit 100, and ensuring the structural strength and positional stability of the bellows unit 100.

[0122] Alternatively, the heat-insulating buffer ring may be made of silicone rubber, aerogel composite felt, or polytetrafluoroethylene-glass fiber composite material.

[0123] In a specific example, the heat insulation buffer ring is a polytetrafluoroethylene-glass fiber heat insulation buffer layer, so that the heat insulation buffer ring has both heat insulation and buffering properties.

[0124] In some embodiments, the first heat insulation ring 721 and the second heat insulation ring 722 are both formed as heat insulation buffer rings, which further enhance the heat insulation effect and vibration damping capacity of the heat insulation ring 720, and to a certain extent block the heat conduction path between the first support ring 710 and the second support ring 730, avoid the support unit 700 from directly contacting the bellows unit 100 to form a thermal bridge, ensure the working temperature of the medium, and at the same time reduce the impact of external impact force and vibration force on the bellows unit 100, which is conducive to improving the structural strength and positional stability of the bellows unit 100.

[0125] It should be noted that in the scenario of aerospace engine fuel delivery (sudden temperature change from -196℃ to 800℃), the heat insulation buffer ring of the support unit 700 can absorb the stress of thermal expansion and contraction, further reducing the thermal fatigue crack incidence rate at the weld between the support seal 500 and the bellows unit 100 from 30% in the prior art to nearly 0, ensuring the stability of the weld between the support seal 500 and the bellows unit 100 and improving the sealing performance of the accommodating cavity 130.

[0126] Optionally, one of the first heat insulation ring 721 and the second heat insulation ring 722 is formed as a heat insulation buffer ring, and the other is formed as a heat insulation ring component. The heat insulation ring component can be made of materials such as polytetrafluoroethylene, ceramics (alumina, zirconium oxide, etc.) or glass fiber reinforced plastic.

[0127] It should be noted that the heat insulation ring in this application is a honeycomb ceramic heat insulation core, which utilizes the low thermal conductivity of ceramic (1.2W / (m²)). K)) blocks the heat conduction path of the metal ring.

[0128] In a specific example, the radial thickness of the shape memory nickel-titanium alloy support ring (first support ring 710) is 2mm-3mm, and the thickness of the heat insulation ring 720 is 5mm-8mm. This ensures the support strength of the support unit 700, which can withstand radial pressure of more than 10MPa without deformation. At the same time, it can reduce the heat conduction efficiency of the support unit 700, reducing the heat loss rate to below 3%, thereby reducing the heat transfer between the inner corrugated pipe 110 and the outer corrugated pipe 120.

[0129] It should be noted that the support unit 700 blocks thermal bridges through the heat insulation ring 720 (ceramic heat insulation core + heat insulation buffer layer), and simultaneously utilizes the first support ring 710 (shape memory alloy support ring) to achieve dynamic support. Therefore, the support unit 700 of this application has at least the following advantages for different application scenarios:

[0130] In the liquefied natural gas transportation scenario (-162℃), the cold loss rate of support components made solely of ceramic is 5%, and the cold loss rate of support components made solely of shape memory alloy is 10%-12%. The cold loss rate of the support unit 700 used in this application is reduced to below 3% compared to the 10%-15% of the prior art, making the cold loss rate far superior to that of ceramic support components and shape memory alloy support components.

[0131] In high-temperature steam transportation (300°C) scenarios, the heat loss rate of the support unit 700 used in this application is reduced from 12% to 4%, and the surface temperature of the outer corrugated pipe 120 can be controlled below 50°C, thereby avoiding the risk of burns to personnel.

[0132] Meanwhile, the dynamic adaptation characteristics of the first support ring 710 enable the support force of the bellows unit 700 to be automatically adjusted by 20%-30% within a temperature range of -196℃ (liquid oxygen) to 800℃ (high-temperature gas), so that the bellows unit 100 with a large diameter (above 1m) will not deform inward under normal pressure, and the integrity rate of the seal between the bellows unit 100 and the support seal 500 is close to 100%.

[0133] In some embodiments, such as Figure 1 As shown, the support unit 700 includes multiple units, which are arranged at intervals along the axial direction of the bellows unit 100. This ensures uniform support of the bellows unit 100 by the multiple support units 700, preventing local collapse or deformation of the bellows unit 100. At the same time, the multiple support units 700 can also disperse external forces and vibration forces, further improving the structural stability of the bellows unit 100 and extending its service life.

[0134] In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0135] The pressure regulation method of the bellows assembly 1000 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0136] like Figure 5 As shown, a pressure regulating method for a bellows assembly 1000 according to an embodiment of the present invention is described. The bellows assembly 1000 is the aforementioned bellows assembly 1000. The specific structure of the bellows assembly 1000 is not described in detail here. The pressure regulating method for the bellows assembly 1000 includes the following steps:

[0137] S1. The gas content in the receiving cavity 130 is detected by the gas content detection device 200.

[0138] In this step, the gas content in the containment cavity 130 can be obtained, so that the gas delivery unit 300 can be used for subsequent gas extraction or gas replenishment.

[0139] S2. Control the gas delivery unit 300 to extract gas from the receiving cavity 130 based on the detection result of the gas content detection device 200; or, control the gas delivery unit 300 to deliver gas into the receiving cavity 130 based on the detection result of the gas content detection device 200.

[0140] This step involves two scenarios: First, when the bellows unit 100 is used for vacuuming, the gas delivery unit 300 needs to be controlled to extract gas from the containment cavity 130 to reduce the gas content in the containment cavity 130, thereby creating a vacuum or negative pressure state in the containment cavity 130. Second, when the bellows assembly 1000 is used in deep-sea or high-pressure scenarios, the gas delivery unit 300 needs to be controlled to deliver gas into the containment cavity 130 to balance the internal and external pressure difference of the bellows unit 100 and prevent the bellows unit 100 from collapsing.

[0141] As can be seen from the above method, the pressure regulation method of the bellows assembly 1000 in this embodiment of the invention can effectively regulate the pressure of the receiving cavity 130 in real time, thereby balancing the internal and external pressure difference of the bellows unit 100 to ensure the working performance of the bellows assembly 1000, so that the bellows assembly 1000 can adapt to different working conditions.

[0142] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0143] Figure 1 The above illustration shows two support units 700 for illustrative purposes. However, those skilled in the art, after reading the above technical solution, will obviously understand that applying this solution to one, three, four or more support units 700 would also fall within the protection scope of this invention.

[0144] The specific working principles of other components of the bellows assembly 1000 and the pressure regulating method of the bellows assembly 1000 according to embodiments of the present invention, such as the gas content detection element 200 and the control valve 320, are known to those skilled in the art and will not be described in detail here.

[0145] In the description of this specification, references to terms such as "embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions 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 one or more embodiments or examples.

[0146] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A bellows assembly, characterized in that, include: A bellows unit (100) includes an inner bellows (110) and an outer bellows (120). The outer bellows (120) is spaced around the outer periphery of the inner bellows (110), and a receiving cavity (130) is formed between the outer bellows (120) and the inner bellows (110). A support unit (700) is sleeved on the outer periphery of the inner corrugated pipe (110) and connected between the inner corrugated pipe (110) and the outer corrugated pipe (120). A gas content detection element (200) is disposed in the receiving cavity (130) and is used to detect the gas content in the receiving cavity (130) in real time. A gas delivery unit (300) is connected to the receiving cavity (130). The gas delivery unit (300) is used to extract gas from the receiving cavity (130) according to the detection result of the gas content detection device (200) so that the receiving cavity (130) forms a vacuum or negative pressure state; or, the gas delivery unit (300) is used to deliver gas into the receiving cavity (130) according to the detection result of the gas content detection device (200) so that the receiving cavity (130) forms a positive pressure state. The support unit (700) includes a first support ring (710), a heat insulation ring (720), and a second support ring (730). The first support ring (710) is sleeved on the outer periphery of the inner corrugated pipe (110). Two heat insulation rings (720) and two second support rings (730) are included, with the two second support rings (730) respectively located on the radial sides of the first support ring (710). The two second support rings (730) are respectively connected to the inner corrugated pipe (110) and the outer corrugated pipe (730). The corrugated pipe (120) is fixedly connected, and the two heat insulation rings (720) are respectively disposed between the first support ring (710) and the second support ring (730). The heat insulation ring (720) includes a first heat insulation ring (721) and a second heat insulation ring (722). The first heat insulation ring (721) and the second heat insulation ring (722) are sequentially fitted together along the radial direction of the support unit (700). One of the first heat insulation ring (721) and the second heat insulation ring (722) is formed as a heat insulation buffer ring.

2. The bellows assembly according to claim 1, characterized in that, It also includes a controller (400), which is communicatively connected to the gas content detection device (200). The controller (400) is used to control the gas delivery unit (300) to extract gas from the receiving cavity (130) or deliver gas toward the receiving cavity (130) according to the detection result of the gas content detection device (200).

3. The bellows assembly according to claim 2, characterized in that, The gas delivery unit (300) includes a delivery pipe (310), a control valve (320), and one of an extraction device and a gas replenishment device. One end of the delivery pipe (310) is connected to the receiving cavity (130), and the other end of the delivery pipe (310) is connected to the extraction device or the gas replenishment device. The extraction device is used to extract gas from the receiving cavity (130) through the delivery pipe (310), and the gas replenishment device is used to deliver gas into the receiving cavity (130) through the delivery pipe (310). The control valve (320) is communicatively connected to the controller (400), and the controller (400) is used to control the opening degree of the control valve (320) to adjust the opening degree of the delivery pipe (310).

4. The bellows assembly according to claim 3, characterized in that, It also includes a support seal (500) which is disposed at both ends of the axial direction of the bellows unit (100). The inner bellows (110) and the outer bellows (120) are both fixedly connected to the support seal (500). At least part of the delivery pipe (310) is integrated into the support seal (500).

5. The bellows assembly according to claim 4, characterized in that, The gas content detection element (200) is fixedly connected to the support seal element (500).

6. The bellows assembly according to claim 1, characterized in that, It also includes a getter pack (600), which is disposed in the receiving cavity (130) and is used to adsorb the gas in the receiving cavity (130) to maintain the gas content in the receiving cavity (130).

7. The bellows assembly according to claim 1, characterized in that, The inner wall of the receiving cavity (130) is provided with a heat radiation suppressor, which is a metal coating, and the metal coating is a silver layer or a polytetrafluoroethylene layer.

8. The bellows assembly according to claim 1, characterized in that, The inner surface of the inner corrugated pipe (110) is provided with anti-corrosion and heat insulation components; and / or, the outer surface of the outer corrugated pipe (120) is provided with reflective components.

9. The bellows assembly according to claim 8, characterized in that, The corrosion-resistant and heat-insulating component includes a polytetrafluoroethylene component and a ceramic composite component stacked sequentially, and the reflective component is an aluminum foil component.

10. The bellows assembly according to claim 1, characterized in that, The first support ring (710) is a shape memory alloy support ring; and / or, the second support ring (730) is a metal ring.

11. The bellows assembly according to claim 1, characterized in that, The support unit (700) includes a plurality of units, which are arranged at intervals along the axial direction of the bellows unit (100).

12. A method for regulating the voltage of a bellows assembly, characterized in that, The bellows assembly is the bellows assembly according to any one of claims 1-11, and the pressure regulation method of the bellows assembly includes the following steps: The gas content in the receiving cavity (130) is detected by the gas content detection device (200); Based on the detection result of the gas content detector (200), the gas delivery unit (300) is controlled to extract gas from the receiving cavity (130); or, based on the detection result of the gas content detector (200), the gas delivery unit (300) is controlled to deliver gas into the receiving cavity (130).

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