Force-balanced expansion joints for improving compensation and stability

Abstract

This invention provides a force-balanced expansion joint for improving compensation and stability, comprising: at least one bellows, at least two connecting plates, multiple mounting rods, and multiple balancing mechanisms; the connecting plates are arranged side-by-side and spaced apart, with the gap between adjacent connecting plates forming a clamping space, and each connecting plate having a through hole; the bellows is clamped within the clamping space, and the interior of the bellows communicates with the through holes of each connecting plate; each mounting rod is sequentially and movably inserted through each connecting plate, with both ends of each mounting rod positioned outside the connecting plate located on the side; each end of each mounting rod is provided with a balancing mechanism, and each balancing mechanism is used to balance the preset pressure when gas at a preset pressure is filled into the bellows. In this invention, each balancing mechanism can effectively counteract the preset pressure of the gas, making the expansion joint as a whole in a balanced state, and can also significantly reduce the stress on pipeline supports.

Description

Technical Field

[0001] This invention relates to the field of telescopic device technology, and more specifically, to a force-balanced telescopic joint for improving compensation and stability. Background Technology

[0002] Expansion joints are mechanical components that compensate for pipeline thermal displacement, installation displacement, and foundation settlement displacement. With the development of the power transmission and transformation industry, the role of expansion joints in pipelines is becoming increasingly important, with development trends towards larger compensation capacity, longer fatigue life, and improved stability. However, in cases of insufficient pipeline support strength or overhead pipelines, existing expansion joints cannot effectively counteract the gas expansion force within the bellows, increasing the burden on the pipeline supports. Summary of the Invention

[0003] In view of this, the present invention proposes a force-balanced expansion joint for improving compensation and stability, aiming to solve the problem that the expansion joint in the prior art cannot effectively counteract the gas expansion force inside the bellows.

[0004] This invention proposes a force-balanced expansion joint for improving compensation and stability. The force-balanced expansion joint includes: at least one bellows, at least two connecting plates, multiple mounting rods, and multiple balancing mechanisms. The connecting plates are arranged side-by-side and spaced apart, with the gap between adjacent connecting plates forming a clamping space. Each connecting plate has a through hole. The bellows is clamped within the clamping space, and the interior of the bellows communicates with the through holes of each connecting plate. Each mounting rod is sequentially and movably inserted through each connecting plate, with both ends of each mounting rod positioned outside the connecting plate located on its side. Each end of each mounting rod is provided with a balancing mechanism, and each balancing mechanism is used to balance the preset pressure when gas at a preset pressure is filled into the bellows.

[0005] Furthermore, the force-balanced expansion joint used to improve compensation and stability further includes: a linkage mechanism; wherein, when there are at least two bellows and at least three connecting plates, the number of bellows is one less than the number of connecting plates, and each clamping space formed by each connecting plate corresponds one-to-one with each bellows, and each bellows is clamped in the corresponding clamping space; the linkage mechanism is provided on each connecting plate to make each bellows move synchronously.

[0006] Furthermore, in the force-balanced expansion joint described above for improving compensation and stability, when there are two bellows and three connecting plates, each mounting rod is locked to the connecting plate located in the middle position.

[0007] Furthermore, in the force-balanced expansion joint described above for improving compensation and stability, each balancing mechanism includes: a positioning tube, a first locking member, a second locking member, an indicator, a scale member with graduations, and an elastic member with a preset constant force and a preset compression amount; wherein, the first locking member is located at the end of the mounting rod, the elastic member is sleeved on the rod body of the mounting rod located outside the connecting plate on the side and clamped between the first locking member and the connecting plate on the side, and the indicator is located on the first locking member; the second locking member is located at a preset position on the rod body of the mounting rod and is located on both sides of the connecting plate on the side, respectively, with the first locking member on the side; the positioning tube is detachably sleeved on the mounting rod and clamped between the connecting plate on the side and the second locking member; the scale member is located on the connecting plate on the side and extends outward, and the scale member is parallel to the mounting rod.

[0008] Furthermore, in the force-balanced expansion joint described above for improving compensation and stability, a gasket is provided between the elastic element and the connecting plate located on the side; a pressure cap is provided between the positioning tube and the second locking element.

[0009] Furthermore, in the force-balanced expansion joint described above for improving compensation and stability, the positioning tube includes two arc-shaped bodies; wherein the two arc-shaped bodies can be connected in an apposition, and the two arc-shaped bodies, when appositioned, form a space for accommodating the mounting rod.

[0010] Furthermore, in the force-balanced expansion joint described above for improving compensation and stability, each balancing mechanism further includes: a sleeve; wherein the sleeve is movably fitted onto the outside of the mounting rod, and the sleeve is movably inserted through the connecting plate located on the side, with both ends of the sleeve abutting against the indicator and the pressure cap respectively; and an elastic element fitted onto the outside of the sleeve.

[0011] Furthermore, in the aforementioned force-balanced expansion joint for improving compensation and stability, the scale element is a cylindrical body with one open end and the other closed. The cylindrical body is made of transparent material and has scale lines on its outer wall. Multiple drainage holes are provided on the lower side wall of the cylindrical body. The open end of the cylindrical body is connected to a connecting plate located on the side. The cylindrical body covers the outside of the rod of the mounting rod located outside the connecting plate on the side. There is a preset distance between the end of the mounting rod and the closed end of the cylindrical body. The first locking element, the indicator element, and the elastic element are all placed inside the cylindrical body. And / or, the indicator element is annular and is sleeved on the mounting rod and sandwiched between the first locking element and the elastic element.

[0012] Furthermore, in the force-balanced expansion joint described above for improving compensation and stability, each mounting rod has a threaded outer wall, and each first locking element and each second locking element are nuts; locking nuts are provided on both sides of the connecting plate located in the middle position to clamp the connecting plate located in the middle position.

[0013] Furthermore, in the force-balanced expansion joint described above for improving compensation and stability, the linkage mechanism includes: at least one linkage component disposed on the outer side of each connecting plate; wherein each linkage component includes: two first linkage plates, two second linkage plates, and two third linkage plates; wherein the first ends of the two first linkage plates are rotatably connected and the connection point is rotatably connected to one of the connecting plates located on the side, the second ends of the two first linkage plates are rotatably connected to the first ends of the two second linkage plates in a one-to-one correspondence; the two second linkage plates intersect, the intersection of the two second linkage plates is rotatably connected and rotatably connected to the connecting plate located in the middle position, the second ends of the two second linkage plates are rotatably connected to the first ends of the two third linkage plates in a one-to-one correspondence, and the second ends of the two third linkage plates are rotatably connected and the connection point is rotatably connected to another connecting plate located on the side.

[0014] In this invention, a bellows is sandwiched in the space between two connecting plates. The interior of the bellows is connected to the through holes on the connecting plates to allow gas at a preset pressure to be introduced into it. Each mounting rod connects the connecting plates and the bellows together. Each end of each mounting rod is placed outside the connecting plate located on the side and is equipped with a balancing mechanism. Each balancing mechanism balances the preset pressure of the gas, effectively offsetting the preset pressure of the gas, so that the force-balanced expansion joint is in a balanced state, ensuring that the bellows is subjected to balanced forces. This solves the problem that the expansion joint in the prior art cannot effectively offset the gas expansion force inside the bellows. At the same time, when this expansion joint is applied to pipelines, it can significantly reduce the stress on pipeline supports. Attached Figure Description

[0015] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0016] Figure 1 This is a structural schematic diagram of a force-balanced expansion joint for improving compensation and stability, provided in an embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the balancing mechanism in a force-balanced expansion joint for improving compensation and stability, provided in an embodiment of the present invention.

[0018] Figure 3 This is a structural diagram of the elastic element in a force-balanced expansion joint for improving compensation and stability, as provided in an embodiment of the present invention. Detailed Implementation

[0019] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] See Figures 1 to 3 The figure shows a preferred structure of the force-balanced expansion joint used to improve compensation and stability in this embodiment. As shown, the force-balanced expansion joint includes: at least one bellows 1, at least two connecting plates 2, multiple mounting rods 4, and multiple balancing mechanisms 5. The connecting plates 2 are arranged side-by-side, i.e., parallel to each other. The connecting plates 2 are spaced apart, i.e., there is a preset gap between any two adjacent connecting plates 2, forming a clamping space. The bellows 1 is clamped within the corresponding clamping space, and the two ends of the bellows 1 are respectively connected to two adjacent connecting plates 2 in a one-to-one correspondence.

[0021] Each connecting plate 2 has a through hole located at its center. Furthermore, the interior of each bellows 1 is connected to the through hole of each connecting plate 2 to facilitate the introduction of gas at a preset pressure. Specifically, the diameter of the through hole on each connecting plate 2 matches the inner diameter of the bellows 1, the bellows 1 connects to the through hole of the connecting plate 2, and the interior of the bellows 1 is connected to the through hole.

[0022] Each mounting rod 4 is sequentially and movably inserted into each connecting plate 2, with both ends of each mounting rod 4 positioned outside the connecting plate 2 located on its side. Specifically, each connecting plate 2 has multiple through holes, with each through hole on each connecting plate 2 corresponding to the previous one. Each mounting rod 4 is sequentially inserted into the corresponding through hole on each connecting plate 2, and each mounting rod 4 can move within the through hole in a direction perpendicular to the connecting plate 2. Figure 1 The movement can be from left to right (as shown), or the connecting plate 2 can move relative to the mounting rod 4.

[0023] Each mounting rod 4 is movable relative to each connecting plate 2, and each end of each mounting rod 4 extends outside the connecting plate 2 located on the side. Specifically, the connecting plate 2 located on the side is referred to as the side connecting plate 22, then there are two side connecting plates 22, and the remaining connecting plates are located between the two side connecting plates 22. Each mounting rod 4 is spaced apart circumferentially on each connecting plate 2.

[0024] Each end of each mounting rod 4 is provided with a balancing mechanism 5. Specifically, the balancing mechanism 5 is located outside the side connecting plate 2 (i.e., side connecting plate 22) and is located at the end of the mounting rod 4. When gas at a preset pressure is filled into the bellows 1, each balancing mechanism 5 is used to balance the preset pressure, so that the preset pressure of the gas can be counteracted by each balancing mechanism 5, thereby keeping the force-balanced expansion joint in a balanced state. Specifically, each balancing mechanism 5 provides a constant reaction force to counteract the pressure thrust generated by the bellows 1, achieving the purpose of force balance.

[0025] In practical implementation, under working conditions requiring significant compensation, such as linear thermal displacement, installation displacement, and foundation settlement displacement, force-balanced expansion joints can achieve a large amount of compensation with high stability. At the same time, force-balanced expansion joints utilize the self-balancing of their own structure to reduce the requirements on the foundation, reduce the overall structural size, and save material costs.

[0026] As can be seen, in this embodiment, the bellows 1 is sandwiched in the space between the two connecting plates 2. The interior of the bellows 1 is connected to the through hole on the connecting plate 2 so as to allow gas at a preset pressure to be introduced into it. Each mounting rod 4 connects each connecting plate 2 and each bellows 1 together. Each end of each mounting rod 4 is placed outside the connecting plate 2 located on the side and is provided with a balancing mechanism 5. Each balancing mechanism 5 balances the preset pressure of the gas, effectively offsetting the preset pressure of the gas, so that the force-balanced expansion joint is in a balanced state. This solves the problem that the expansion joint in the prior art cannot effectively offset the gas expansion force in the bellows. At the same time, when this expansion joint is applied to pipelines, it can significantly reduce the stress on the pipeline support.

[0027] See Figure 1 In the above embodiments, when there are at least two bellows 1 and at least three connecting plates 2, the number of bellows 1 is one less than the number of connecting plates 2. The gap between any two adjacent connecting plates 2 forms a clamping space, thus forming multiple clamping spaces between each connecting plate 2. The number of clamping spaces is the same as the number of bellows 1, and each clamping space corresponds one-to-one with each bellows 1. Each bellows 1 is clamped within its corresponding clamping space. One end of each bellows 1 is connected to one of the adjacent connecting plates 2, and the other end of each bellows 1 is connected to the other adjacent connecting plate 2. The interior of each bellows 1 is connected to the through holes of each connecting plate 2 to facilitate the introduction of gas at a preset pressure.

[0028] The force-balanced expansion joint may further include a linkage mechanism 3. The linkage mechanism 3 is disposed on each connecting plate 2 to enable synchronous movement of each bellows 1. In this way, with multiple bellows 1, the compensation amount of the force-balanced expansion joint can be greatly increased. The linkage mechanism 3 enables synchronous movement of each bellows 1, ensuring the overall expansion and contraction compensation of the force-balanced expansion joint, improving the stability of the force-balanced expansion joint, and preventing instability of the bellows 1.

[0029] When there are two bellows 1 and three connecting plates 2, each mounting rod 4 is locked to the connecting plate 2 located in the middle position. Specifically, the three connecting plates 2 are parallel and spaced apart to form two clamping spaces. Each bellows 1 corresponds to one of the two clamping spaces, and each bellows 1 is clamped within its corresponding clamping space. Specifically, the connecting plate 2 in the middle is referred to as the middle connecting plate 21, and the other two connecting plates 2 on the sides are referred to as the side connecting plates 22. One end of each bellows 1 is connected to the middle connecting plate 21, and the other end of each bellows 1 is connected to the side connecting plate 22.

[0030] In practice, a connecting pipe 11 is provided on both the left and right sides of the intermediate connecting plate 21, and both connecting pipes 11 are located at the through holes of the intermediate connecting plate 21. The two connecting pipes 11 are welded to the intermediate connecting plate 21, and the corrugated pipes 1 on both sides of the intermediate connecting plate 21 are connected to the corresponding connecting pipes 11. The inner diameter of each connecting pipe 11 is equal to the diameter of the through hole and the inner diameter of the corrugated pipe 1.

[0031] In specific implementation, one end of each bellows 1 is welded to the connecting pipe 11, and the other end of each bellows 1 is welded to the through hole of the side connecting plate 22. Of course, other connection methods are also possible, and this embodiment does not impose any restrictions on them.

[0032] Each mounting rod 4 is locked to the intermediate connecting plate 21 and remains stationary after locking, thus limiting the rotation angle of the intermediate connecting plate 21 and eliminating the rotational degree of freedom of the bellows 1 end face, thereby improving the stability of the force-balanced expansion joint. The two ends of the bellows 1 can be considered fixed supports. The column instability is checked using a single bellows 1. According to the standard formula, the ultimate column instability pressure of this structure is four times that of the compound expansion joint, further improving the stability of the bellows 1. The two bellows 1 participate in compensation, with a compensation amount twice that of a single bellows 1, achieving the goal of large compensation.

[0033] As can be seen, in this embodiment, the linkage mechanism 3 enables the two bellows 1 to move synchronously, ensuring the overall expansion and contraction compensation of the force-balanced expansion joint and improving the stability of the force-balanced expansion joint. Each mounting rod 4 connects the three connecting plates 2 and the two bellows 1 together. Each end of each mounting rod 4 is placed outside the side connecting plate 22 and is equipped with a balancing mechanism 5. Each balancing mechanism 5 balances the preset pressure of the gas, so that the force-balanced expansion joint is in a balanced state. The two bellows 1 are independent units, which greatly increases the compensation of the expansion joint and also improves the stability of the bellows 1. There is no need to increase the number of bellows 1, thus avoiding the instability of the bellows 1.

[0034] See Figures 1 to 3 In the above embodiments, each balancing mechanism 5 includes: a positioning tube 51, a first locking member 52, a second locking member 53, an indicator 54, a scale member 55, and an elastic member 56. The scale member 55 is provided with scale lines, is disposed on the connecting plate 2 located on the side, and extends outward, i.e., away from the connecting plate 2 located on the side. Figure 2 Extending from left to right. The scale element 55 is parallel to the mounting rod 4. Specifically, the scale element 55 and the mounting rod 4 are parallel to the rod body located outside the side connecting plate 2 (i.e., side connecting plate 22), and there is a certain gap between the scale element 55 and the mounting rod 4. The scale lines are set along the length direction of the scale element 55, and the length direction of the scale element 55 is consistent with the length direction of the mounting rod 4, that is... Figure 2 The direction from left to right in the middle.

[0035] Preferably, the scale element 55 is a cylindrical body open at one end and closed at the other, and the cylindrical body is made of a transparent material. Furthermore, scale lines are provided on the outer wall of the cylindrical body, and the cylindrical body is positioned at the bottom (relative to...). Figure 2 The side wall of the expansion joint is provided with multiple drainage holes 10. Specifically, each drainage hole 10 is evenly and spaced along the length of the cylinder to facilitate the drainage of rainwater and condensation when the force-balanced expansion joint is used outdoors.

[0036] The open end of the cylinder is connected to the connecting plate 2 (i.e., the side connecting plate 22) located on the side. The cylinder covers the outside of the rod of the mounting rod 4, which is located outside the connecting plate 2 on the side. There is a preset distance between the end of the mounting rod 4 and the closed end of the cylinder. Specifically, the rod of the mounting rod 4, which is located outside the connecting plate 22 on the side, is suspended inside the cylinder. The end of the mounting rod 4 does not contact the closed end of the cylinder, but has a certain distance. This distance can be determined according to the actual situation, and this embodiment does not impose any restrictions on it.

[0037] In practice, the cylinder is made of transparent acrylic material.

[0038] The first locking element 52 is disposed at the end of the mounting rod 4. Specifically, the first locking element 52 is disposed at the end of the mounting rod 4 outside the side connecting plate 22. The first locking element 52 is locked to the mounting rod 4, that is, the first locking element 52 remains stationary. The first locking element 52 is placed inside the cylinder.

[0039] The elastic element 56 has a preset constant force and a preset compression amount. The elastic element 56 is sleeved on the outside of the rod body of the mounting rod 4, which is located outside the side connecting plate 2. Furthermore, the elastic element 56 is clamped between the first locking element 52 and the side connecting plate 2. Specifically, the elastic element 56 is placed inside the cylinder, and the elastic element 56 is sleeved on the outside of the rod body of the mounting rod 4, which is located outside the side connecting plate 22. The first end of the elastic element 56 contacts the first locking element 52, and the second end of the elastic element 56 contacts the side connecting plate 22. The preset compression amount of the elastic element 56 is determined based on the elastic reaction force of the corresponding elastic element 56, and the elastic reaction force of each elastic element 56 is determined based on a preset pressure.

[0040] In practice, the pressure thrust value of the bellows 1 is calculated based on the preset pressure of the gas, and then the pressure thrust value is evenly distributed to each elastic element 56 to determine the elastic reaction force value when each elastic element 56 is compressed. Then, the compression amount of each elastic element 56 is calculated based on each elastic reaction force value.

[0041] Preferably, the elastic element 56 is a constant force spring.

[0042] Preferably, a washer 6 is provided between the elastic element 56 and the connecting plate 2 located on the side. Specifically, the washer 6 is placed inside the cylinder, the washer 6 is sleeved on the rod body of the mounting rod 4, and the washer 6 is sandwiched between the elastic element 56 and the side connecting plate 22. The washer 6 is connected to the inner wall of the cylinder, such as by adhesive bonding, or other connections, as long as it can fix the washer 6 to the cylinder relatively. This embodiment does not impose any restrictions on this.

[0043] The indicator 54 is placed inside the cylinder and is disposed on the first locking member 52. Preferably, the indicator 54 is annular, the indicator 54 is sleeved on the outside of the mounting rod 4, and the indicator 54 is sandwiched between the first locking member 52 and the elastic member 56.

[0044] The second locking member 53 is disposed at a preset position on the rod body of the mounting rod 4. The second locking member 53 and the first locking member 52 are respectively positioned on opposite sides of the connecting plate 2 located on the side. That is, the second locking member 53 is positioned between the side connecting plate 22 and the connecting plate 2 located in the middle position, and is disposed at the preset position on the mounting rod 4. This preset position can be determined according to actual conditions, and this embodiment does not impose any restrictions on it.

[0045] The positioning tube 51 is detachably sleeved on the mounting rod 4 and clamped between the connecting plate 2 located on the side and the second locking member 53. That is, the positioning tube 51 is detachably connected to the mounting rod 4, the positioning tube 51 is sleeved on the outside of the mounting rod 4, and one end of the positioning tube 51 is in contact with the side connecting plate 22, and the other end of the positioning tube 51 is in contact with the second locking member 53.

[0046] Preferably, the positioning tube 51 includes two arc-shaped bodies. These two arc-shaped bodies are posteriorly connected, forming a space to accommodate the mounting rod 4. Specifically, the first ends of the two arc-shaped bodies are rotatably connected, and the second ends are locked together, allowing the two arc-shaped bodies to be opened or closed. The two arc-shaped bodies, when closed, form an accommodating space through which the mounting rod 4 passes, meaning the two arc-shaped bodies are fitted over the outside of the mounting rod 4.

[0047] In practice, the first ends of the two arc-shaped bodies can be connected by hinges to allow for rotation. The second ends of the two arc-shaped bodies can be connected by snap-fit, plug-in, pin, etc., as long as it can ensure that the second ends of the two arc-shaped bodies can be locked together. This embodiment does not impose any restrictions on this.

[0048] More preferably, a pressure cap 12 is provided between the positioning tube 51 and the second locking member 53. Specifically, the pressure cap 12 is annular and is sleeved on the rod body of the mounting rod 4, and a washer 6 is clamped between the positioning tube 51 and the second locking member 53. The pressure cap 12 can be connected to the second locking member 53.

[0049] In practice, during the movement of the elastic element 56, the cylinder can act as an external guide for the elastic element 56 to prevent it from becoming unstable and failing.

[0050] As can be seen, in this embodiment, each balancing mechanism 5 is balanced with the preset pressure of the gas by the elastic element 56 with the preset constant force and preset compression amount, so as to ensure the overall balance of the force-balanced expansion joint and increase the compensation amount of the force-balanced expansion joint. When the force-balanced expansion joint compensates, it reduces the axial stiffness reaction force of the bellows 1.

[0051] Preferably, the scale member 55 is a cylindrical body with one open end and the other closed. The cylindrical body is made of transparent material and has scale lines on its outer wall. Multiple drainage holes 10 are provided on the lower side wall of the cylindrical body. The open end of the cylindrical body is connected to the connecting plate 2 located on the side. The cylindrical body covers the outside of the rod of the mounting rod 4 located outside the connecting plate 2 on the side. There is a preset distance between the end of the mounting rod 4 and the closed end of the cylindrical body. The first locking member 52, the indicator member 54, and the elastic member 56 are all placed inside the cylindrical body. And / or, the indicator member 54 is annular and is sleeved on the mounting rod 4 and sandwiched between the first locking member 52 and the elastic member 56.

[0052] See Figures 1 to 3 In the above embodiments, the outer wall of each mounting rod 4 is provided with threads, and each first locking member 52 and each second locking member 53 is a nut. Each nut is screwed to the mounting rod 4 to ensure that the positions of each first locking member 52 and each second locking member 53 remain unchanged.

[0053] When there are two bellows 1 and three connecting plates 2, the structure for locking the mounting rod 4 to the connecting plate 2 located in the middle position can be as follows: Locking nuts 8 are provided on both sides of the connecting plate 2 located in the middle position to clamp the connecting plate in the middle position. Specifically, locking nuts 8 are provided on both sides of the middle connecting plate 21, and the two locking nuts 8 are screwed to the mounting rod 4. The two locking nuts 8 are respectively placed on the left and right sides of the middle connecting plate 21, and the two locking nuts 8 clamp the middle connecting plate 21.

[0054] As can be seen, in this embodiment, the first locking member 52 and the second locking member 53 have simple structures and are easy to implement. The intermediate connecting plate 21 and the mounting rod 4 are locked together by the locking nut 8, which is convenient for operation.

[0055] See Figures 1 to 3 In each of the above embodiments, each balancing mechanism 5 further includes a sleeve 7. The sleeve 7 is movably fitted onto the outside of the mounting rod 4 and movably passes through the connecting plate 2 located on the side. Specifically, the sleeve 7 is fitted onto the outside of the mounting rod 4 near its end, and there is a certain gap between the sleeve 7 and the mounting rod 4, allowing relative movement between the mounting rod 4 and the sleeve 7. The side connecting plate 22 has a through hole corresponding to each mounting rod 4, and the sleeve 7 is movably inserted through the corresponding through hole in the side connecting plate 22, allowing relative movement between the side connecting plate 22 and the sleeve 7.

[0056] The two ends of the sleeve 7 correspond one-to-one with the indicator 54 and the pressure cap 12. One end of the sleeve 7 abuts against the indicator 54, and the other end of the sleeve 7 abuts against the pressure cap 12. In this way, the relative positions of the sleeve 7, the mounting rod 4, the indicator 54, and the pressure cap 12 remain unchanged. When compression or stretching is required, the side connecting plate 22 will move, driving the scale member 55 to move, and simultaneously compressing the elastic member 56. The elastic member 56 is fitted onto the outside of the sleeve 7.

[0057] In practice, a pressure cap 12 is sandwiched between the sleeve 7 and the second locking member 53. At this time, the pressure cap 12 does not need to be connected to the second locking member 53.

[0058] In practice, each sleeve 7 can be made of copper.

[0059] As can be seen, in this embodiment, the sleeve 7 can effectively protect the mounting rod 4. When the outer wall of the mounting rod 4 is threaded, the sleeve 7 can protect the thread, preventing the mounting rod 4 from getting stuck with the side connecting plate 22 and hindering its movement. In addition, the sleeve 7 can act as an inner guide for the elastic element to prevent instability during displacement.

[0060] See Figures 1 to 3 In the above embodiments, the linkage mechanism 3 may include at least one linkage component. Each linkage component is disposed on the outer side of each connecting plate 2, preferably, the linkage components are evenly distributed along the circumference of the connecting plate 2.

[0061] In specific implementation, the structure of the linkage mechanism 3 can be determined according to the actual situation, as long as it can achieve synchronous movement between each bellows 1. This embodiment does not impose any restrictions on this.

[0062] Taking the structure of each linkage assembly when there are two bellows 1 and three connecting plates 2 as an example, the structure of one type of linkage mechanism 3 is described: Each linkage assembly includes: a first linkage plate 31, two second linkage plates 32, and two third linkage plates 33. The first ends of the two first linkage plates 31 are rotatably connected, and the connection point of the first ends of the two first linkage plates 31 is rotatably connected to one of the connecting plates 2 located on the side. The second ends of the two first linkage plates 31 correspond one-to-one with the first ends of the two second linkage plates 32, and the second end of each first linkage plate 31 is rotatably connected to the first end of the corresponding second linkage plate 32.

[0063] The two second linkage plates 32 intersect, specifically forming an "X" shape. The intersection of the two second linkage plates 32 is rotatably connected, and the intersection of the two second linkage plates 32 is rotatably connected to the connecting plate 2 (i.e., the intermediate connecting plate 21) located in the middle. The second ends of the two second linkage plates 32 correspond one-to-one with the first ends of the two third linkage plates 33, and the second end of each second linkage plate 32 is rotatably connected to the first end of the corresponding third linkage plate 33. The second ends of the two third linkage plates 33 are rotatably connected, and the connection point of the second ends of the two third linkage plates 33 is rotatably connected to another connecting plate 2 located on the side.

[0064] In specific implementation, each linkage component further includes: three fixing frames 9, each detachably mounted on the same side of the middle connecting plate 21 and the two side connecting plates 22. Preferably, the fixing frame 9 is bolted to each connecting plate 2. The interior of the fixing frame 9 is rectangular to restrict the degree of freedom of each link in the plane perpendicular to the direction of movement and to restrict the compressive displacement of the force-balanced telescopic joint. The connection point of the first ends of the two first linkage plates 31 is rotatably connected to the fixing frame 9 at one of the side connecting plates 22. The intersection of the two second linkage plates 32 is rotatably connected to the fixing frame 9 at the middle connecting plate 21, and the connection point of the second ends of the two third linkage plates 33 is rotatably connected to the fixing frame 9 at the other side connecting plate 22.

[0065] In practice, all the connecting plates are connected by a rotating shaft to achieve a rotatable connection. Of course, other rotatable connection methods can also be used, and this embodiment does not impose any restrictions on this.

[0066] In specific implementation, one of the first linkage plates 31, one of the second linkage plates 32, and one of the third linkage plates 33 in the linkage mechanism 3 are parallel to each other, and these three linkage plates form a first linkage group; correspondingly, another first linkage plate 31, another second linkage plate 32, and another third linkage plate 33 are parallel to each other, and these three linkage plates form a second linkage group. In this way, the linkage mechanism 3 forms two rhomboid frames.

[0067] The two second linkage plates 32 are of equal length, as are the two first linkage plates 31 and the two third linkage plates 33. Furthermore, the length of the second linkage plate 32 is twice the length of the first linkage plate 31. The thicknesses of the first linkage plate 31, second linkage plate 32, and third linkage plate 33 in the first linkage group are all equal. When the linkage plates are connected by a pivot, the first linkage plate 31, second linkage plate 32, and third linkage plate 33 in the second linkage group are all two parallel plates. These two plates clamp the corresponding linkage plates in the first linkage group and are connected by a pivot. In this case, twice the thickness of each plate is equal to the thickness of the linkage plate in the first linkage group.

[0068] In specific implementation, when there are at least two bellows 1 and at least three connecting plates 2, the two second connecting plates 32 in each linkage assembly can form a linkage group. There are multiple linkage groups. The two second connecting plates 32 in each linkage group intersect and are rotatably connected at the intersection. At the same time, the intersection is rotatably connected to the connecting plate 2 located in the middle. The corresponding ends of the second connecting plates 32 of two adjacent linkage groups are rotatably connected. The ends of the two second connecting plates 32 of the linkage group located on one side are rotatably connected to the second ends of the two first connecting plates 31. The ends of the two second connecting plates 32 of the linkage group located on the other side are rotatably connected to the first ends of the two third connecting plates 33.

[0069] As can be seen, in this embodiment, the linkage mechanism 3 can evenly distribute the displacement of the force-balanced expansion joint to each bellows 1, so that the compensation amount of the two bellows 1 is consistent. The two bellows 1 compensate at the same time, which increases the compensation amount. This structure is simple and can improve stability.

[0070] See Figures 1 to 3 The installation of a force-balanced expansion joint is described using two bellows 1 and three connecting plates 2 as an example: Two bellows 1 are sandwiched between three connecting plates 2, and the bellows 1 are welded to the connecting plates 2. Each mounting rod 4 is sequentially inserted through one of the three connecting plates 2. For one mounting rod 4, the structure of the remaining mounting rods 4 is the same. A locking nut 8 is set on both sides of the middle connecting plate 21, and the two locking nuts 8 clamp the middle connecting plate 21 in the middle. For one end of a mounting rod 4, the structure of the other end is the same: a washer 6 and an elastic element 56 are fitted onto the rod body of the mounting rod 4 outside the side connecting plate 22. The elastic element 56 is compressed, and when the elastic element 56 reaches the preset compression amount, it is locked by the first locking element 52. Due to the action of the elastic element 56, the side connecting plate 22 tends to compress the bellows 1. Between the side connecting plate 22 and the middle connecting plate 21, a positioning tube 51, a pressure cap 12 and a second locking member 53 are installed on the mounting rod 4 to prevent the side connecting plate 22 from compressing the bellows 1.

[0071] After installation, gas at a preset pressure is injected into the bellows 1. The elastic reaction force of the elastic element 56 is equal in magnitude and opposite in direction to the thrust of the gas inside the bellows 1, and they are in a state of equilibrium. At this time, the positioning tubes 51 are removed, and the force-balanced expansion joint can compensate freely. The outer surface of the cylinder is engraved with scales and readings. After relative displacement with the indicator 54 along the axial direction, the displacement value of a single bellows 1 is read according to the scale markings. Twice the displacement value of a single bellows 1 is the overall compensation amount of the force-balanced expansion joint.

[0072] In summary, in this embodiment, the bellows 1 is sandwiched between two connecting plates 2, and the interior of the bellows 1 is connected to the through holes on each connecting plate 2 to facilitate the introduction of gas at a preset pressure. The linkage mechanism 3 enables each bellows 1 to move synchronously, ensuring the overall expansion and contraction compensation of the force-balanced expansion joint. Each mounting rod 4 connects each connecting plate 2 and each bellows 1 together. Each end of each mounting rod 4 is placed outside the side connecting plate 22 and is equipped with a balancing mechanism 5. Each balancing mechanism 5 balances the preset pressure of the gas, so that the force-balanced expansion joint is in a balanced state. Each bellows 1 is an independent unit, which greatly increases the compensation amount and improves the stability of the bellows 1. There is no need to increase the number of bellows in the bellows 1, avoiding instability of the bellows 1. At the same time, when this expansion joint is applied to pipelines, it can significantly reduce the stress on pipeline supports.

[0073] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0074] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 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 according to the specific circumstances.

[0075] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A force balance type expansion joint for improving compensation amount and stability, characterized by, The utility model relates to a kind of corrugated pipes, including: At least one corrugated pipe (1), at least two connecting plates (2), multiple mounting rods (4) and multiple balancing mechanisms (5);Wherein, Each of the connecting plates (2) is arranged side by side and spaced apart, and the gap between the two adjacent connecting plates (2) forms a clamping space, and each of the connecting plates (2) is provided with a through hole; The corrugated pipe (1) is clamped in the clamping space, and the inside of the corrugated pipe (1) is communicated with the through hole of each of the connecting plates (2); Each of the mounting rods (4) is movably arranged in each of the connecting plates (2) in sequence, and the two ends of each of the mounting rods (4) are arranged outside the connecting plates (2) located at the side; Each end of each of the mounting rods (4) is provided with one of the balancing mechanisms (5), and each of the balancing mechanisms (5) is used to balance the preset pressure when the corrugated pipe (1) is filled with gas of the preset pressure; Each of the balancing mechanisms (5) comprises a positioning tube (51), a first locking member (52), a second locking member (53), an indicating member (54), a scale member (55) provided with a scale line, and an elastic member (56) having a preset constant force and a preset compression amount;Wherein, The first locking member (52) is arranged at the end of the mounting rod (4), the elastic member (56) is sleeved on the rod body of the mounting rod (4) arranged outside the connecting plate (2) located at the side and clamped between the first locking member (52) and the connecting plate (2) located at the side, and the indicating member (54) is arranged on the first locking member (52); The second locking member (53) is arranged at a preset position on the rod body of the mounting rod (4) and is arranged on both sides of the connecting plate (2) located at the side respectively with the first locking member (52), and the positioning tube (51) is detachably sleeved on the mounting rod (4) and clamped between the connecting plate (2) located at the side and the second locking member (53); The scale member (55) is arranged on the connecting plate (2) located at the side and extends outward, and the scale member (55) is parallel to the mounting rod (4); The scale member (55) is a cylinder with one end open and the other end closed, the cylinder is made of transparent material and has a scale line on the outer wall, and the side wall of the cylinder arranged below is provided with a plurality of drain holes (10); The open end of the cylinder is connected with the connecting plate (2) located at the side, the cylinder is arranged outside the rod body of the mounting rod (4) arranged outside the connecting plate (2) located at the side, and the end of the mounting rod (4) has a preset distance from the closed end of the cylinder; The first locking member (52), the indicating member (54) and the elastic member (56) are arranged in the cylinder;And / or The indicating member (54) is annular, and the indicating member (54) is sleeved on the mounting rod (4) and clamped between the first locking member (52) and the elastic member (56).

2. The force balance type expansion joint for improving compensation amount and stability according to claim 1, characterized by, Further comprising: A linkage mechanism (3);Wherein, When the corrugated pipe (1) is at least two, the connecting plate (2) is at least three, The number of the bellows (1) is one less than the number of the connecting plates (2), each of the connecting plates (2) forms a clamping space corresponding to each of the bellows (1), and each of the bellows (1) is clamped in the corresponding clamping space; The linkage mechanism (3) is arranged on each of the connecting plates (2) to enable synchronous movement of each of the bellows (1).

3. The force balance expansion joint for improving compensation and stability according to claim 2, wherein, When the number of the bellows (1) is two and the number of the connecting plates (2) is three, Each of the mounting rods (4) is locked with the connecting plate (2) located at the middle position.

4. The force balance expansion joint for improving compensation and stability according to claim 1, wherein, A gasket (6) is arranged between the elastic member (56) and the connecting plate (2) located at the side; A gland (12) is arranged between the positioning tube (51) and the second locking member (53).

5. The force balance type expansion joint for improving compensation amount and stability according to claim 1, wherein The positioning tube (51) comprises two arc-shaped bodies, wherein, The two arc-shaped bodies are connected in a foldable manner, and the two arc-shaped bodies form a space for accommodating the mounting rod (4) after being folded.

6. The force balance type expansion joint for improving compensation amount and stability according to claim 4, wherein Each of the balancing mechanisms (5) further comprises a sleeve (7), wherein, The sleeve (7) is movably sleeved on the outside of the mounting rod (4), and the sleeve (7) is movably penetrated through the connecting plate (2) located at the side, and the two ends of the sleeve (7) abut against the indicating member (54) and the gland (12), respectively; The elastic member (56) is sleeved on the outside of the sleeve (7).

7. The force balance expansion joint for improving compensation and stability according to claim 3, wherein, The outer wall of each of the mounting rods (4) is provided with a thread, and each of the first locking member (52) and the second locking member (53) is a nut; The connecting plate (2) located at the middle position is provided with locking nuts (8) on both sides to clamp the connecting plate (2) located at the middle position.

8. The force balance expansion joint for improved compensation and stability according to claim 3, wherein, The linkage mechanism (3) comprises at least one linkage assembly arranged on the outside of each of the connecting plates (2), wherein, Each of the linkage assemblies comprises two first linkage plates (31), two second linkage plates (32), and two third linkage plates (33); The first ends of the two first linkage plates (31) are rotatably connected and connected to one of the connecting plates (2) located at the side in a rotatable manner, and the second ends of the two first linkage plates (31) and the first ends of the two second linkage plates (32) are correspondingly and rotatably connected; The two second connecting plates (32) cross each other, the crossing of the two second connecting plates (32) is rotatably connected with the connecting plate (2) located in the middle position, the second ends of the two second connecting plates (32) are rotatably connected with the first ends of the two third connecting plates (33) one by one, and the second ends of the two third connecting plates (33) are rotatably connected and connected with the other connecting plate (2) located at the side.

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