Ultra-high pressure metal bellows compensation device

Abstract

The present invention provides an ultra-high-pressure metal bellows compensation device, which relates to the technical field of pipeline equipment and includes: a first flange, a second flange, a first bellows, a second bellows, and an adjusting piston. The first flange has a fluid passage, is provided with a mounting hole and an internal connecting hole, and the adjusting piston is disposed in the mounting hole. The mounting hole is divided into a first cavity and a second cavity by the adjusting piston. The first cavity is connected to a storage space, and the second cavity is connected to the fluid passage of the first flange via the internal connecting hole. The adjusting piston has a first pressure-bearing surface and a second pressure-bearing surface, which face away from each other in the longitudinal direction of the adjusting piston, with the first pressure-bearing surface located in the first cavity and the second pressure-bearing surface located in the second cavity. The device can utilize the fluid transmitted in the pipeline to achieve pressure compensation on the outer side of the first bellows, significantly increasing the design pressure of the bellows compensation device, broadening its scope of use, and effectively extending its service life.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline equipment, and in particular to an ultra-high pressure metal bellows compensation device. Background Art

[0002] In industrial systems, piping structures are often installed to transport materials such as steam, water, and oil. However, in practical applications, factors such as thermal expansion and foundation settlement often necessitate the installation of flexible compensators within the piping equipment to compensate for pipeline deformation. Furthermore, in some specific situations, these devices can also be used to reduce vibration and isolate equipment.

[0003] At present, the flexible compensation devices used in the industrial field mainly include metal bellows, rubber tubes, etc. Among them, most metal bellows are single-layer designs. Although this design method can meet the needs of most industrial systems, for some ultra-high pressure applications, single-layer metal bellows often suffer from the problem of bellows instability, deformation and failure, which makes it difficult to meet the use requirements. Summary of the Invention

[0004] The present invention provides an ultra-high pressure metal bellows compensation device to solve the problem in the prior art that single-layer metal bellows often suffer from instability, deformation and failure in ultra-high pressure applications, making it difficult to meet usage requirements.

[0005] The present invention provides an ultra-high pressure metal bellows compensation device, comprising: a first flange, a second flange, a first bellows, a second bellows and an adjusting piston.

[0006] The first bellows is coaxially sleeved on the inner side of the second bellows, with both ends of the first bellows being sealedly connected to the first flange and the second flange respectively, and both ends of the second bellows being sealedly connected to the first flange and the second flange respectively, forming an accommodation space between the first bellows and the second bellows, and the accommodation space being filled with a pressure medium;

[0007] The first flange has a fluid passage, a mounting hole and an internal connecting hole are provided inside the first flange, the adjusting piston is disposed in the mounting hole and is movable along the length direction of the mounting hole, the mounting hole is divided into a first cavity and a second cavity by the adjusting piston, the first cavity is connected to the accommodating space, and the second cavity is connected to the fluid passage of the first flange via the internal connecting hole;

[0008] The regulating piston has a first pressure-bearing surface and a second pressure-bearing surface, which face away from each other in the length direction of the regulating piston. The first pressure-bearing surface is located in the first cavity, and the second pressure-bearing surface is located in the second cavity.

[0009] According to an ultra-high pressure metal bellows compensation device provided by the present invention, the regulating piston includes a first shaft and a second shaft, the first shaft and the second shaft are coaxially connected, the diameter of the first shaft is larger than the diameter of the second shaft, the mounting hole includes a first inner hole and a second inner hole, the first inner hole and the second inner hole are coaxially connected, the inner diameter of the first inner hole is larger than the inner diameter of the second inner hole, the first inner hole is connected to the accommodating space, the first shaft is located in the first inner hole, and the second shaft is inserted into the second inner hole.

[0010] The end surface of the first shaft facing away from the second shaft is the first pressure-bearing surface;

[0011] The end surface of the second shaft facing away from the first shaft is the second pressure-bearing surface, or the end surface of the first shaft connected to the second shaft is the second pressure-bearing surface.

[0012] According to an ultra-high pressure metal bellows compensation device provided by the present invention, the end surface of the second shaft facing away from the first shaft is the second pressure-bearing surface.

[0013] The first flange is provided with an external connection hole, and the first inner hole forms a third cavity on one side of the end surface where the first shaft is connected to the second shaft, and the third cavity is connected to the outside of the first flange through the external connection hole.

[0014] According to an ultra-high pressure metal bellows compensation device provided by the present invention, the end surface where the first shaft is connected to the second shaft is the second pressure-bearing surface.

[0015] The first flange is provided with an external connection hole, and the second inner hole forms a third cavity on a side of the second shaft facing away from the end surface of the first shaft, and the third cavity is connected to the outside of the first flange through the external connection hole.

[0016] According to an ultra-high pressure metal bellows compensation device provided by the present invention, the inner wall of the first inner hole is provided with a first mounting groove surrounding the first shaft rod, and a first sealing ring is provided in the first mounting groove, and the first sealing ring can form a seal between the first mounting groove and the first shaft rod.

[0017] According to an ultra-high pressure metal bellows compensation device provided by the present invention, the inner wall of the second inner hole is provided with a second mounting groove surrounding the second shaft rod, and a second sealing ring is provided in the second mounting groove, and the second sealing ring can form a seal between the second mounting groove and the second shaft rod.

[0018] According to an ultra-high pressure metal bellows compensation device provided by the present invention, the projected area of ​​the first pressure-bearing surface in the length direction of the regulating piston is larger than the projected area of ​​the second pressure-bearing surface in the length direction of the regulating piston.

[0019] According to the ultra-high pressure metal bellows compensation device provided by the present invention, the pressure medium is hydraulic oil or pure water.

[0020] According to an ultra-high pressure metal bellows compensation device provided by the present invention, a first metal transition ring is provided on the side of the first flange facing the second flange, and a second metal transition ring is provided on the side of the second flange facing the first flange, and the two ends of the first bellows are respectively sealed and connected to the first metal transition ring and the second metal transition ring.

[0021] According to an ultra-high pressure metal bellows compensation device provided by the present invention, a third metal transition ring is provided on the side of the first flange facing the second flange, and a fourth metal transition ring is provided on the side of the second flange facing the first flange, and both ends of the second bellows are sealed and connected to the third metal transition ring and the fourth metal transition ring respectively.

[0022] The ultra-high-pressure metal bellows compensation device provided by the present invention includes: a first flange, a second flange, a first bellows, a second bellows, and an adjusting piston. The device can use the fluid transmitted in the pipeline to achieve pressure compensation on the outside of the first bellows, which can significantly increase the design pressure of the bellows compensation device and expand its scope of use. Moreover, the first bellows and the second bellows can cooperate with each other to withstand pressure, which can effectively increase the service life, reduce the frequency of maintenance, and have better economic efficiency. In addition, when one of the first bellows and the second bellows is damaged, the other can still play a sealing role, which can prevent the leakage of hazardous substances in a short time and has higher safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 12 is a schematic structural diagram of an ultra-high pressure metal bellows compensation device according to one embodiment of the present invention;

[0025] Figure 2 yes Figure 1 Enlarged view of part A;

[0026] Figure 3 is a force analysis diagram of the regulating piston in this embodiment;

[0027] Figure 4 1 is a schematic diagram of a partial installation of an adjusting piston in an ultra-high pressure metal bellows compensation device according to another embodiment of the present invention;

[0028] Figure 5 This is a force analysis diagram of the regulating piston in yet another embodiment.

[0029] Reference numerals:

[0030] 1. First flange; 11. First metal transition ring; 12. Third metal transition ring; 2. Second flange; 21. Second metal transition ring; 22. Fourth metal transition ring; 3. First bellows; 4. Second bellows; 5. Adjusting piston; 51. First shaft; 52. Second shaft; 6. Mounting hole; 61. First mounting groove; 62. Second mounting groove; 7. Internal connecting hole; 8. External connecting hole; 9. First sealing ring; 10. Second sealing ring. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0032] In one embodiment of the present invention, an ultra-high pressure metal bellows compensation device is provided. The device can be installed in a pipeline system. The double-layer bellows structure can realize pressure distribution inside the pipeline system, reduce the pressure resistance requirements of single-layer bellows, and is applicable to pipeline systems under ultra-high pressure conditions. Figures 1 to 5 The figure further describes the ultra-high pressure metal bellows compensation device in this embodiment.

[0033] Specifically, if Figure 1 and Figure 2 As shown, the ultra-high pressure metal bellows compensation device in this embodiment includes: a first flange 1 , a second flange 2 , a first bellows 3 , a second bellows 4 and an adjusting piston 5 .

[0034] The first bellows 3 is coaxially sleeved on the inner side of the second bellows 4. The two ends of the first bellows 3 are respectively sealed with the first flange 1 and the second flange 2. The two ends of the second bellows 4 are respectively sealed with the first flange 1 and the second flange 2. An accommodating space is formed between the first bellows 3 and the second bellows 4, and the accommodating space is filled with a pressure medium.

[0035] The first flange 1 has a fluid passage. A mounting hole 6 and an internal connecting hole 7 are provided inside the first flange 1. An adjusting piston 5 is disposed in the mounting hole 6 and is movable along the length of the mounting hole 6. The mounting hole 6 is divided into a first cavity a and a second cavity b by the adjusting piston 5. The first cavity a is connected to the accommodating space, and the second cavity b is connected to the fluid passage of the first flange 1 via the internal connecting hole 7.

[0036] The regulating piston 5 has a first pressure-bearing surface S1 and a second pressure-bearing surface S2, which are separated from each other in the length direction of the regulating piston 5. The first pressure-bearing surface S1 is located in the first cavity a, and the second pressure-bearing surface S2 is located in the second cavity b.

[0037] For example, both the first flange 1 and the second flange 2 can be constructed of metal. They can be configured as tubular structures of a certain length or as plate-like structures of a certain thickness with through holes. The distal end surfaces of the first and second flanges 1 and 2 can be connected to a pipeline. Furthermore, both the first and second flanges 1 and 2 have fluid passages through which fluid can flow.

[0038] The first bellows 3 and the second bellows 4 are both metal bellows, for example, they can be made of carbon steel or stainless steel, etc. The first bellows 3 and the second bellows 4 have the same structure, and both are constructed to be regular wave-like pipes. Figure 1 As shown, both ends of the first bellows 3 and both ends of the second bellows 4 can be sealedly connected to the first flange 1 and the second flange 2 respectively, for example, by welding.

[0039] In this embodiment, if Figure 1 As shown, the first bellows 3 is coaxially sleeved on the inner side of the second bellows 4 .

[0040] There is a gap between the first bellows 3 and the second bellows 4, which serves as an accommodation space. Furthermore, both ends of the accommodation space can be sealed by the first flange 1 and the second flange 2. The accommodation space is fully filled with a pressure medium, which is used to apply a compensating pressure to the first bellows 3 from the outside.

[0041] For example, the pressure medium may be hydraulic oil or pure water, or other fluid substances.

[0042] Furthermore, if Figure 2 As shown, the mounting hole 6 inside the first flange 1 can be extended along the thickness direction of the first flange 1, one end of the mounting hole 6 is connected to the accommodating space, and an adjusting piston 5 is provided in the mounting hole 6. The adjusting piston 5 can at least separate the mounting hole 6 into two first cavities a and second cavities b that are sealed and isolated from each other.

[0043] The first cavity a is connected to the accommodating space, and the pressure medium in the accommodating space can enter the first cavity a.

[0044] The second cavity b is connected to the fluid channel of the first flange 1 via the internal connecting hole 7. It will be understood that the first flange 1 has a fluid channel in its central portion, and the internal connecting hole 7 can extend radially inward and penetrate the fluid channel. When the first flange 1 is connected to an external piping structure, the fluid in the piping structure can enter the fluid channel and then enter the second cavity b through the internal connecting hole 7.

[0045] The regulating piston 5 has a first pressure-bearing surface S1 and a second pressure-bearing surface S2 that are opposite to each other in the length direction of the regulating piston 5. Optionally, the first pressure-bearing surface S1 and the second pressure-bearing surface S2 can be perpendicular to the length direction of the regulating piston 5. The first pressure-bearing surface S1 is located in the first cavity a, and the pressure medium entering the first cavity a can apply pressure to the first pressure-bearing surface S1. The second pressure-bearing surface S2 is located in the second cavity b, and the fluid entering the second cavity b can apply pressure to the second pressure-bearing surface S2.

[0046] In actual application scenarios, the ultra-high-pressure metal bellows compensation device can be installed in an ultra-high-pressure system pipeline using the first flange 1 and the second flange 2. During fluid transmission in the system pipeline, the fluid in the pipeline can flow in the first bellows 3 and exert outward pressure on the inner side of the first bellows 3. In addition, some of the fluid can enter the second cavity b through the internal connection hole 7. At this time, the fluid in the second cavity b can exert pressure on the second end surface S2 of the regulating piston 5. This pressure is transmitted to the pressure medium through the regulating piston 5, and the pressure medium then transmits the pressure to the first bellows 3.

[0047] Thus, with the ultra-high-pressure metal bellows compensation device in this embodiment, pressure compensation can be achieved on the outside of the first bellows 3 using the fluid transmitted in the pipeline, significantly increasing the design pressure of the bellows compensation device and broadening its scope of use. Furthermore, the first bellows 3 and the second bellows 4 can cooperate with each other to withstand pressure, effectively extending their service life and reducing maintenance frequency, resulting in better economic efficiency. Furthermore, if one of the first bellows 3 and the second bellows 4 is damaged, the other can still function as a seal, preventing the leakage of hazardous substances in a short period of time, thus providing greater safety.

[0048] Furthermore, the regulating piston 5 includes a first shaft rod 51 and a second shaft rod 52, which are coaxially connected, and the diameter of the first shaft rod 51 is larger than the diameter of the second shaft rod 52. The mounting hole 6 includes a first inner hole and a second inner hole, and the first inner hole and the second inner hole are coaxially connected, and the inner diameter of the first inner hole is larger than the inner diameter of the second inner hole. The first inner hole is connected to the accommodating space, the first shaft rod 51 is located in the first inner hole, and the second shaft rod 52 is inserted into the second inner hole.

[0049] An end surface of the first shaft 51 facing away from the second shaft 52 is a first pressure-bearing surface S1 .

[0050] The end surface of the second shaft 52 facing away from the first shaft 51 is the second pressure-bearing surface S2 , or the end surface of the first shaft 51 connected to the second shaft 52 is the second pressure-bearing surface S2 .

[0051] It can be understood that the regulating piston 5 can be considered a stepped shaft formed by connecting two shafts of different diameters, wherein the larger diameter portion is the first shaft 51, and the smaller diameter portion is the second shaft 52. The mounting hole 6 can be considered a stepped hole, wherein the larger inner diameter portion is the first inner hole, and the smaller inner diameter portion is the second inner hole. The outer wall of the first shaft 51 matches the inner wall of the first inner hole, and the outer wall of the second shaft 52 matches the inner wall of the second inner hole.

[0052] One end of the first inner hole facing away from the second inner hole is connected to the accommodating space, and the end face of the first shaft 51 facing away from the second shaft 52 is the first pressure-bearing surface S1. The cavity in the first inner hole located on one side of the first pressure-bearing surface S1 is the first cavity a. At this time, the pressure medium in the accommodating space can enter the first cavity a and contact the first pressure-bearing surface S1 on the first shaft 51.

[0053] The second pressure-bearing surface S2 may be the end surface of the second shaft 52 facing away from the first shaft 51 , or the end surface of the first shaft 51 connected to the second shaft 52 .

[0054] When the end face of the second shaft 52 facing away from the first shaft 51 is the second pressure-bearing surface S2, the fluid transmitted in the external pipeline can enter the second inner hole through the internal connecting hole 7 and contact the second pressure-bearing surface S2, thereby exerting pressure on it, and finally transmitting the pressure to the outside of the first bellows 3 to achieve pressure compensation.

[0055] When the end face of the first shaft 51 connected to the second shaft 52 is the second pressure-bearing surface S2, the fluid transmitted in the external pipeline can enter the first inner hole through the internal connecting hole 7 and contact the second pressure-bearing surface S2, thereby applying pressure thereto, and finally transmitting the pressure to the outside of the first bellows 3 to achieve pressure compensation.

[0056] In this embodiment, if Figure 2 As shown, the end surface of the second shaft 52 facing away from the first shaft 51 is the second pressure-bearing surface S2.

[0057] The first flange 1 is provided with an external connection hole 8 , and the first inner hole forms a third cavity c on one side of the end surface where the first shaft 51 is connected to the second shaft 52 . The third cavity c is connected to the outside of the first flange 1 via the external connection hole 8 .

[0058] It can be understood that the first shaft 51 separates the first inner hole into two independent areas, one of which is the first cavity a connected to the accommodating space, and the other is the third cavity c connected to the second inner hole. Moreover, the third cavity c can be connected to the external atmospheric environment via the external connecting hole 8.

[0059] Accordingly, since the second shaft 52 is inserted into the second inner hole, the end face of the second shaft 52 facing away from the first shaft 51 and the remaining area of ​​the second inner hole form a second cavity b, and the second cavity b can be connected to the fluid channel of the first flange 1 via the internal connecting hole 7.

[0060] In actual use, after the ultra-high pressure metal bellows compensation device is installed in the ultra-high pressure system pipeline using the first flange 1 and the second flange 2, the fluid transmitted in the system pipeline can flow in the first bellows 3 and exert outward pressure on the inner side of the first bellows 3. In addition, part of the fluid can enter the second cavity b through the internal connection hole 7. Figure 3 As shown, the fluid in the second cavity b can exert a first pressure P1 on the second end surface S2 of the regulating piston 5. This pressure is transmitted to the pressure medium via the regulating piston 5. The pressure medium then exerts a second pressure P2 on the first end surface S1 of the regulating piston 5. The pressure medium can also transmit this pressure to the first bellows 3. At this time, since the third cavity c is connected to the external atmosphere, a vacuum in the third cavity c can be avoided, ensuring that the regulating piston 5 can move normally within the mounting hole 6.

[0061] In yet another embodiment, Figure 4 As shown, the end surface where the first shaft 51 is connected to the second shaft 52 is the second pressure-bearing surface S2.

[0062] The first flange 1 is provided with an external connection hole 8 , and the second inner hole forms a third cavity c on the side of the second shaft 52 away from the end surface of the first shaft 51 . The third cavity c is connected to the outside of the first flange 1 via the external connection hole 8 .

[0063] It can be understood that the first shaft 51 separates the first inner hole into two independent areas, one of which is the first cavity a connected to the accommodating space, and the other is the second cavity b connected to the second inner hole and the fluid channel connected to the first flange 1 via the internal connecting hole 7.

[0064] Correspondingly, since the second shaft rod 52 is inserted into the second inner hole, the end face of the second shaft rod 52 facing away from the first shaft rod 51 and the remaining area of ​​the second inner hole form a third cavity c, and the third cavity c can be connected to the external atmospheric environment via the external connecting hole 8.

[0065] In actual use, after the ultra-high pressure metal bellows compensation device is installed in the ultra-high pressure system pipeline using the first flange 1 and the second flange 2, the fluid transmitted in the system pipeline can flow in the first bellows 3 and exert outward pressure on the inner side of the first bellows 3. In addition, part of the fluid can enter the second cavity b through the internal connection hole 7. Figure 5 As shown, the fluid in the second cavity b can exert a first pressure P1 on the second end surface S2 of the regulating piston 5. This pressure is transmitted to the pressure medium via the regulating piston 5. The pressure medium then exerts a second pressure P2 on the first end surface S1 of the regulating piston 5. The pressure medium can also transmit this pressure to the first bellows 3. At this time, since the third cavity c is connected to the external atmosphere, a vacuum in the third cavity c can be avoided, ensuring that the regulating piston 5 can move normally within the mounting hole 6.

[0066] Optionally, a projected area of ​​the first pressure-bearing surface S1 in the longitudinal direction of the regulating piston 5 is larger than a projected area of ​​the second pressure-bearing surface S2 in the longitudinal direction of the regulating piston 5 .

[0067] Through the above-mentioned arrangement, the pressure borne by the pressure medium in the accommodating space can be made smaller than the pressure exerted by the fluid, thereby achieving pressure compensation and reducing the pressure-bearing requirement of the single-layer bellows.

[0068] by Figure 2Taking the structure shown in as an example, the first pressure-bearing surface S1 and the second pressure-bearing surface S2 are both perpendicular to the length direction of the regulating piston 5, and the surface area of ​​the first pressure-bearing surface S1 is twice the surface area of ​​the second pressure-bearing surface S2. In actual application, the pressure exerted by the fluid transmitted in the pipeline on the second pressure-bearing surface S2 is twice the pressure exerted by the pressure medium in the accommodating space on the first pressure-bearing surface S1. At this time, the pressure exerted by the pressure medium on the outside of the first bellows 3 is half of the pressure exerted by the fluid on the inside of the first bellows 3.

[0069] Based on the above design, the pressure borne by the first bellows 3 is equal to the pressure of the fluid in the tube minus the pressure of the pressure medium in the accommodating space, which is half of the pressure of the fluid in the tube, while the pressure borne by the second bellows 4 is the pressure of the pressure medium in the accommodating space, which is also half of the pressure of the fluid in the tube, thereby reducing the pressure-bearing requirement of the single-layer bellows.

[0070] Of course, the area relationship between the first pressure-bearing surface S1 and the second pressure-bearing surface S2 can be flexibly adjusted according to actual usage requirements.

[0071] Furthermore, in order to ensure that the two cavities separated by the first shaft 51 in the first inner hole have sufficient sealing effect to avoid fluid leakage, as shown in FIG. Figure 2 As shown, the inner wall of the first inner hole is formed with a first mounting groove 61 surrounding the first shaft 51 , and a first sealing ring 9 is arranged in the first mounting groove 61 , which can form a seal between the first mounting groove 61 and the first shaft 51 .

[0072] It can be understood that the first mounting groove 61 is an annular groove surrounding the first shaft rod 51, and the first sealing ring 9 can be an annular rubber sealing ring. The first sealing ring 9 can simultaneously abut against the first mounting groove 61 and the first shaft rod 51, thereby achieving sealing between the first mounting groove 61 and the first shaft rod 51.

[0073] Moreover, in order to further improve the sealing effect, there can be multiple first mounting grooves 61 , which are spaced apart along the length direction of the first inner hole, and each first mounting groove 61 is provided with a first sealing ring 9 .

[0074] Similarly, in order to ensure that the two cavities separated by the second shaft 52 in the second inner hole have sufficient sealing effect to avoid fluid leakage, as shown in FIG. Figure 2 As shown, the inner wall of the second inner hole is formed with a second mounting groove 62 surrounding the second shaft 52 , and a second sealing ring 10 is arranged in the second mounting groove 62 . The second sealing ring 10 can form a seal between the second mounting groove 62 and the second shaft 52 .

[0075] It can be understood that the second mounting groove 62 is an annular groove surrounding the second shaft rod 52, and the second sealing ring 10 can be an annular rubber sealing ring. The second sealing ring 10 can simultaneously abut against the second mounting groove 62 and the second shaft rod, thereby achieving sealing between the second mounting groove 62 and the second shaft rod 52.

[0076] Moreover, in order to further improve the sealing effect, there can be multiple second mounting grooves 62 , which are spaced apart along the length direction of the second inner hole, and each second mounting groove 62 is provided with a second sealing ring 10 .

[0077] In this embodiment, in order to ensure that the first bellows 3 can be effectively connected to the first flange 1 and the second flange 2, as shown in FIG. Figure 1 As shown, a first metal transition ring 11 is provided on the side of the first flange 1 facing the second flange 2, and a second metal transition ring 21 is provided on the side of the second flange 2 facing the first flange. Both ends of the first bellows 3 are sealedly connected to the first metal transition ring 11 and the second metal transition ring 21 respectively.

[0078] For example, one side of the first flange 1 in the longitudinal direction is used to connect to an external pipeline, and the other side is provided with a first metal transition ring 11. The first metal transition ring 11 can be integrally formed and provided on the first flange 1. Subsequently, one end of the first bellows 3 is sealed and connected to the first metal transition ring 11 by welding.

[0079] Similarly, one side of the second flange 2 in the longitudinal direction is used to connect to the external pipeline, and the other side is provided with a second metal transition ring 21, which can be integrally formed and provided on the second flange 2. Thereafter, the other end of the first bellows 3 is sealed and connected to the second metal transition ring 21 by welding.

[0080] The structure of the second bellows 4 is the same as that of the first bellows 3 , and the second bellows 4 can be connected to the first flange 1 and the second flange 2 in the same manner.

[0081] For example, a third metal transition ring 12 is provided on the side of the first flange 1 facing the second flange 2, and a fourth metal transition ring 22 is provided on the side of the second flange 2 facing the first flange 1. The two ends of the second bellows 4 are sealedly connected to the third metal transition ring 12 and the fourth metal transition ring 22 respectively.

[0082] Exemplarily, the third metal transition ring 12 is arranged in the same manner as the first metal transition ring 11, and the third metal transition ring 12 is arranged on the outside of the first metal transition ring 11; the fourth metal transition ring 22 is arranged in the same manner as the second metal transition ring 21, and the fourth metal transition ring 22 is arranged on the outside of the second metal transition ring 21.

[0083] In addition, both the first flange 1 and the second flange 2 can be connected to the external pipeline by means of a bolt structure.

[0084] As a way to implement Figure 1 and Figure 2 As shown, the outer wall of the first flange 1 is provided with a first flange structure extending outward in its radial direction. The first flange structure is extended in the circumferential direction of the first flange 1 and is provided with a mounting hole penetrating along the length direction of the first flange 1.

[0085] Therefore, in actual use, when the first flange 1 needs to be connected to an external pipe, the bolts can pass through the mounting holes on the first flange structure and engage with the external pipe.

[0086] Similarly, the outer wall of the second flange 2 is provided with a second flange structure extending outward in its radial direction. The second flange structure is extended in the circumferential direction of the second flange 2 and is provided with a mounting hole penetrating along the length direction of the second flange 2 .

[0087] Therefore, in actual use, when the second flange 2 needs to be connected to an external pipe, the bolts can be passed through the mounting holes on the second flange structure and engaged with the external pipe.

[0088] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An ultra-high pressure metal bellows compensation device, characterized in that: include: a first flange, a second flange, a first bellows, a second bellows and an adjusting piston, The first bellows is coaxially sleeved on the inner side of the second bellows, with both ends of the first bellows being sealedly connected to the first flange and the second flange respectively, and both ends of the second bellows being sealedly connected to the first flange and the second flange respectively, forming an accommodation space between the first bellows and the second bellows, and the accommodation space being filled with a pressure medium; The first flange has a fluid passage, a mounting hole and an internal connecting hole are provided inside the first flange, the adjusting piston is disposed in the mounting hole and is movable along the length direction of the mounting hole, the mounting hole is divided into a first cavity and a second cavity by the adjusting piston, the first cavity is connected to the accommodating space, and the second cavity is connected to the fluid passage of the first flange via the internal connecting hole; The regulating piston has a first pressure-bearing surface and a second pressure-bearing surface, the first pressure-bearing surface and the second pressure-bearing surface are separated from each other in the length direction of the regulating piston, the first pressure-bearing surface is located in the first cavity, and the second pressure-bearing surface is located in the second cavity; The regulating piston includes a first shaft and a second shaft, the first shaft and the second shaft are coaxially connected, the diameter of the first shaft is larger than the diameter of the second shaft, the mounting hole includes a first inner hole and a second inner hole, the first inner hole and the second inner hole are coaxially connected, the inner diameter of the first inner hole is larger than the inner diameter of the second inner hole, the first inner hole is connected to the accommodating space, the first shaft is located in the first inner hole, and the second shaft is inserted into the second inner hole. The end surface of the first shaft facing away from the second shaft is the first pressure-bearing surface; The end surface of the second shaft facing away from the first shaft is the second pressure-bearing surface, or the end surface of the first shaft connected to the second shaft is the second pressure-bearing surface; The inner wall of the first inner hole is provided with a first mounting groove surrounding the first shaft rod, and a first sealing ring is provided in the first mounting groove, and the first sealing ring can form a seal between the first mounting groove and the first shaft rod; The inner wall of the second inner hole is provided with a second mounting groove surrounding the second shaft rod. A second sealing ring is provided in the second mounting groove. The second sealing ring can form a seal between the second mounting groove and the second shaft rod.

2. The ultra-high pressure metal bellows compensation device according to claim 1, characterized in that: The end surface of the second shaft facing away from the first shaft is the second pressure-bearing surface. The first flange is provided with an external connection hole, and the first inner hole forms a third cavity on one side of the end surface where the first shaft is connected to the second shaft, and the third cavity is connected to the outside of the first flange through the external connection hole.

3. The ultra-high pressure metal bellows compensation device according to claim 1, characterized in that: The end surface of the first shaft connected to the second shaft is the second pressure-bearing surface. The first flange is provided with an external connection hole, and the second inner hole forms a third cavity on a side of the second shaft facing away from the end surface of the first shaft, and the third cavity is connected to the outside of the first flange through the external connection hole.

4. The ultra-high pressure metal bellows compensation device according to claim 1, characterized in that: A projected area of ​​the first pressure-bearing surface in the longitudinal direction of the regulating piston is larger than a projected area of ​​the second pressure-bearing surface in the longitudinal direction of the regulating piston.

5. The ultra-high pressure metal bellows compensation device according to claim 1, characterized in that: The pressure medium is hydraulic oil or pure water.

6. The ultra-high pressure metal bellows compensation device according to claim 1, characterized in that: A first metal transition ring is provided on the side of the first flange facing the second flange, and a second metal transition ring is provided on the side of the second flange facing the first flange. Both ends of the first bellows are sealed with the first metal transition ring and the second metal transition ring respectively.

7. The ultra-high pressure metal bellows compensation device according to claim 1, characterized in that: A third metal transition ring is provided on the side of the first flange facing the second flange, a fourth metal transition ring is provided on the side of the second flange facing the first flange, and both ends of the second bellows are sealedly connected to the third metal transition ring and the fourth metal transition ring respectively.

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