A non-metallic straight pipe pressure balance type expansion joint with leakage monitoring

Abstract

The present invention provides a non-metallic straight pipe pressure balance type expansion joint with leakage monitoring, which includes a front flange, a front middle flange, a rear middle flange, a rear flange, a tie rod structure, and a rolling deformation component. The front flange is connected to the rear middle flange through the tie rod structure, and the rear flange is connected to the front middle flange through the tie rod structure. The front middle flange and the rear middle flange are connected in a manner that allows relative displacement; a rolling deformation member is arranged between the front flange and the front middle flange, and a rolling deformation member is arranged between the rear flange and the rear middle flange. The rolling deformation member can deform in a rolling deformation manner along the left-right direction, enabling relative displacement between the front flange and the front middle flange, and / or relative displacement between the rear flange and the rear middle flange; the present invention can increase the axial compensation ability, is beneficial to reducing the radial and axial lengths of the expansion joint, optimizes the installation space requirements of the expansion joint, and can also reduce the axial stiffness and radial stiffness of the expansion joint.

Description

Technical Field

[0001] The present invention relates to the technical field of expansion joints, and particularly relates to a non-metallic straight pipe pressure balance type expansion joint with leakage monitoring. Background Art

[0002] To avoid the pressure thrust generated by the unconstrained expansion joint acting on the equipment and affecting the normal operation of the equipment, a straight pipe pressure balance type expansion joint is usually selected to restrain the pressure thrust. The existing metal straight pipe pressure balance type expansion joint ( Figure 1 ) or non-metallic straight pipe pressure balance type expansion joint ( Figure 2 ) often consists of two groups of working bellows, a balance bellows in the middle, and structural components such as tie rods and end plates, and is mainly used to absorb the axial direction and can restrain the pressure thrust of the bellows.

[0003] When the conventional structure straight pipe pressure balance type expansion joint compensates for the lateral displacement, the three groups of bellows (two groups of working bellows and one group of balance bellows) distribute the displacement according to the stiffness ratio, and the large lateral displacement compensation function of the compound bellows cannot be realized. Within the limited length dimension range, the ability to compensate for the lateral displacement is very limited, and the stiffness is relatively large, resulting in a large elastic reaction force on the equipment nozzle.

[0004] At the same time, in the conventional structure straight pipe pressure balance type expansion joint, a bellows structure is often adopted. During the process of compensating for the axial displacement, in addition to the axial deformation of the bellows, the elastic element in the bellows will also undergo radial deformation (such as Figure 5 , which can be understood as the force deformation schematic of a small section of the corrugated structure in the bellows in the figure, and can also correspond to Figure 2 at K), which causes the entire bellows to produce an overall lateral deformation, resulting in a relatively large radial stiffness. This also leads to the fact that in the existing straight pipe pressure balance type expansion joint, it is often difficult to adopt a relatively thin wall thickness for the bellows.

[0005] Therefore, for the straight pipe pressure balance type expansion joint in the prior art, on the premise of the given compensation requirements of the pipeline, the expansion joint requires a longer installation dimension, which may cause layout conflicts in some cases; at the same time, on the premise of the given allowable installation dimension limit of the pipe system, the expansion joint has a relatively large stiffness, and it is necessary to enhance the strength of the pipe system restraint structure or the strength of the equipment nozzle, which undoubtedly has relatively high requirements for the thick wall material properties of the relevant components of the expansion joint. Both of the above situations will increase the construction cost. Summary of the Invention

[0006] In view of this, the present invention aims to provide a non-metallic straight pipe pressure balance type expansion joint with leakage monitoring to solve the problems of relatively large stiffness and excessive size of the conventional straight pipe pressure balance type expansion joint in the prior art.

[0007] To achieve the above object, the technical solution of the present invention is implemented as follows:

[0008] A non-metallic straight pipe pressure balance type expansion joint with leakage monitoring, comprising a front flange, a front middle flange, a rear middle flange, a rear flange, a tie rod structure, and a rolling deformation component. The front flange is connected to the rear middle flange through the tie rod structure, the rear flange is connected to the front middle flange through the tie rod structure, and the front middle flange and the rear middle flange are connected in a manner that allows relative displacement; a rolling deformation member is arranged between the front flange and the front middle flange, and a rolling deformation member is arranged between the rear flange and the rear middle flange. The rolling deformation member can deform in a rolling deformation manner along the left-right direction, so that relative displacement can occur between the front flange and the front middle flange, and / or relative displacement can occur between the rear flange and the rear middle flange.

[0009] Furthermore, the rolling deformation member is a U-shaped elastic element, the U-shaped opening of the rolling deformation member faces left or right, and any one end of the rolling deformation member can move relative to the other end of the rolling deformation member in a form along the left-right direction, so that the whole of the rolling deformation member can deform in a rolling deformation manner in the left-right direction.

[0010] Furthermore, a balance cavity is formed among the front flange, the front middle flange, the rear middle flange, and the rear flange. The balance cavity is communicated with the pipe cavity of the pipeline, and the U-shaped opening of the rolling deformation member faces the balance cavity and is communicated with the balance cavity.

[0011] Furthermore, between the front flange and the front middle flange, one end of the rolling deformation member is connected to the front flange and the other end is connected to the front middle flange; between the rear flange and the rear middle flange, one end of the rolling deformation member is connected to the rear flange and the other end is connected to the rear middle flange.

[0012] Furthermore, an outer gasket ring and an outer compression flange are sequentially arranged on the side of the front middle flange away from the rear middle flange, and an outer gasket ring and an outer compression flange are sequentially arranged on the side of the rear middle flange away from the front middle flange. The rolling deformation member is sequentially connected to the outer gasket ring and the outer compression flange; an inner gasket ring and an inner compression flange are sequentially arranged on the side of the front flange close to the rear flange, and an inner gasket ring and an inner compression flange are sequentially arranged on the side of the rear flange close to the front flange. The rolling deformation member is sequentially connected to the inner gasket ring and the inner compression flange.

[0013] Furthermore, the rolling deformation member is of a double-layer structure. The outer gasket ring is provided with a detection hole, and a first monitoring meter is arranged outside the detection hole. The detection end of the first monitoring meter penetrates through the detection hole and extends between the inner layer and the outer layer of the rolling deformation member for detecting whether the inner layer of the rolling deformation member is damaged and leaking.

[0014] Furthermore, a plug-in component or a flange groove is provided on the side of the front middle flange facing the rear middle flange, a flange groove or a plug-in component is provided on the side of the rear middle flange facing the front middle flange, the plug-in component is arranged in the flange groove, and the plug-in component can move left and right along the flange groove.

[0015] Furthermore, a seal is provided between the outer wall of the plug-in component and the inner wall of the flange groove.

[0016] Furthermore, a second monitoring gauge is provided on the outer wall of the flange groove. The detection end of the second monitoring gauge penetrates the outer wall of the flange groove and communicates with the annular cavity between the plug-in component and the flange groove, for detecting whether there is breakage and leakage at the seal.

[0017] Furthermore, the tie rod structure includes a ball head bolt and a locking assembly. The tie rod structure has two assembly structural forms: Form 1: The ball head bolt sequentially penetrates the front flange and the rear middle flange, and the locking assembly is arranged on the side of the rear middle flange away from the front flange and is connected to the ball head bolt; Form 2: The ball head bolt sequentially penetrates the rear flange and the front middle flange, and the locking assembly is arranged on the side of the front middle flange away from the rear flange and is connected to the ball head bolt; In the circumferential direction of the expansion joint, Form 1 and Form 2 are arranged alternately.

[0018] Compared with the prior art, the non-metallic straight pipe pressure balance type expansion joint with leakage monitoring of the present invention has the following advantages:

[0019] The non-metallic straight pipe pressure balance type expansion joint with leakage monitoring of the present invention, compared with the straight pipe pressure balance type expansion joint with a bellows provided in the prior art, does not need to be provided with a conventional bellows form. By providing rolling deformation components, the compression and tensile deformation of the traditional bellows structure is avoided (as shown in the attached Figure 5 figure), and the traditional compression and tensile deformation is changed to the rolling deformation of the rolling deformation components (as shown in the attached Figure 6 figure). This improvement in the structure, on the one hand, in the axial direction, can greatly reduce the axial stiffness of the expansion joint and at the same time increase the axial compensation ability. Correspondingly, it is beneficial to reduce the radial and axial lengths of the expansion joint, which is beneficial to optimizing and reducing the size of the expansion joint and optimizing the installation space requirements of the expansion joint; on the other hand, it enables the expansion joint to only produce rolling deformation in the left and right directions and no longer participate in radial deformation, and no longer faces the problem that "the bellows will produce overall lateral deformation, resulting in a relatively large radial stiffness", which can further reduce the overall radial stiffness of the expansion joint.

[0020] Meanwhile, for rolling deformation only in the left - right direction, most of the loads on the rolling deformation member in the working state are borne by the front flange and the rear flange. Under the same design pressure conditions, the wall thickness of the rolling deformation member in this application can be smaller than that of the elastic element of a conventional non - metallic expansion joint, further reducing the overall stiffness of the expansion joint, to a certain extent reducing the requirement for enhancing the strength of the pipe system restraint structure or the strength of the equipment nozzle, and also avoiding the requirement for the performance of thick - wall materials in the prior art. Brief Description of the Drawings

[0021] The drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0022] Figure 1 is a schematic structural diagram of a conventional metal straight - pipe pressure - balanced expansion joint in the prior art;

[0023] Figure 2 is a schematic structural diagram of a conventional non - metallic straight - pipe pressure - balanced expansion joint in the prior art;

[0024] Figure 3 is a schematic structural diagram of a non - metallic straight - pipe pressure - balanced expansion joint with leakage monitoring according to an embodiment of the present invention;

[0025] Figure 4 Another schematic structural diagram of a non - metallic straight - pipe pressure - balanced expansion joint with leakage monitoring according to an embodiment of the present invention;

[0026] Figure 5 is a schematic diagram of the force - deformation situation of the bellows section in a straight - pipe pressure - balanced expansion joint in the prior art;

[0027] Figure 6 is a schematic diagram of the rolling deformation of the rolling deformation member in a non - metallic straight - pipe pressure - balanced expansion joint with leakage monitoring according to an embodiment of the present invention.

[0028] Explanation of the Reference Numerals:

[0029] 1. Front flange; 2. Ball head bolt; 3. Outer compression flange; 4. Rolling deformation part; 5. Shipping nut; 6. Front middle flange; 7. Sealing element; 8. Rear middle flange; 9. Locking assembly; 10. Outer gasket ring; 11. Rear flange; 12. Inner gasket ring; 13. Inner compression flange; 14. First monitoring table; 15. Second monitoring table; A. End pipe; B. Working bellows; C. Tie rod; D. Balance bellows; E. First end plate; F. Second end plate; G. Straight pipe flange; H. Stud; I. Ball conical gasket; J. End face flange; K. Non-metallic elastic element; L. Middle flange; M. Limit screw; N. Straight pipe flange; O. Inner compressive ring; P. Reinforcing wire; Q. Outer compressive ring. Detailed implementation manners

[0030] The inventive concepts of the present disclosure will hereinafter be described using terms that are ordinarily used by those skilled in the art to convey the substance of their work to other artisans in the art. However, these inventive concepts may be embodied in many different forms and should not be construed as limited to the embodiments described herein. The "left and right" in this application are based on the coordinates in the Figure 3 accompanying drawings. At the same time, terms such as "axial direction, radial direction (or transverse direction), circumferential direction" are all conventional terms in the field of straight pipe expansion joints and are all referenced with the central axis of the pipeline.

[0031] It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention may be combined with each other.

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0033] For the straight pipe pressure balance type expansion joint in the prior art, within a limited length dimension range, the ability to compensate for lateral displacement is very limited, and the stiffness is relatively large, resulting in a large elastic reaction force on the equipment nozzle. On the premise of the given compensation requirements of the pipeline, the expansion joint requires a longer installation dimension, which may cause layout conflicts in some cases; at the same time, on the premise of the given allowable installation dimension limit of the pipe system, the expansion joint has a relatively large stiffness, and it is necessary to enhance the strength of the pipe system restraint structure or the strength of the equipment nozzle, which undoubtedly requires higher material performance requirements for the components related to the expansion joint.

[0034] In order to solve the problems of relatively large stiffness and excessive size of the conventional straight pipe pressure balance type expansion joint in the prior art, this embodiment proposes a non-metallic straight pipe pressure balance type expansion joint with leakage monitoring, as shown in the Figure 3-4As shown, the expansion joint includes a front flange 1, a front middle flange 6, a rear middle flange 8, a rear flange 11, a tie rod structure, and a rolling deformation assembly. The front flange 1 is connected to the rear middle flange 8 through the tie rod structure. The rear flange 11 is connected to the front middle flange 6 through the tie rod structure. The front middle flange 6 and the rear middle flange 8 are connected in a manner that allows relative displacement. A rolling deformation member 4 is provided between the front flange 1 and the front middle flange 6, and a rolling deformation member 4 is provided between the rear flange 11 and the rear middle flange 8. The rolling deformation member 4 can deform in a rolling manner along the left-right direction, enabling relative displacement between the front flange 1 and the front middle flange 6, and / or relative displacement between the rear flange 11 and the rear middle flange 8.

[0035] Specifically, the rolling deformation member 4 is a U-shaped elastic element. The U-shaped opening of the rolling deformation member 4 faces left or right. Any one end of the rolling deformation member 4 can move relative to the other end along the left-right direction, enabling the overall rolling deformation member 4 to deform in a rolling manner in the left-right direction.

[0036] Compared with the straight pipe pressure balance type expansion joint with a bellows in the prior art, this application does not require the setting of a conventional bellows form. By setting the rolling deformation member 4, the compression and tensile deformation of the traditional bellows structure is avoided (as shown in the attached figure). Figure 5 And the traditional compression and tensile deformation is changed to the rolling deformation of the rolling deformation member 4 (as shown in the attached figure). Figure 6 This improvement in the structure, on the one hand, in the axial direction, can significantly reduce the axial stiffness of the expansion joint while increasing the axial compensation ability. Correspondingly, it is beneficial to reduce the radial and axial lengths of the expansion joint, optimize the size of the expansion joint, and optimize the installation space requirements of the expansion joint. On the other hand, it enables the expansion joint to only generate rolling deformation in the left-right direction, no longer participate in radial deformation, and no longer face the problem that "the bellows will generate overall lateral deformation, resulting in a relatively large radial stiffness", which can further reduce the overall radial stiffness of the expansion joint.

[0037] At the same time, for the rolling deformation only in the left-right direction, most of the loads of the rolling deformation member 4 in the working state are borne by the front flange 1 and the rear flange 11. Under the same design pressure conditions, the wall thickness of the rolling deformation member 4 in this application can be smaller than that of the elastic element of the conventional non-metallic expansion joint, further reducing the overall stiffness of the expansion joint, reducing to a certain extent the requirement for enhancing the strength of the pipe system constraint structure or the strength of the equipment nozzle, and also avoiding the requirement for the performance of thick-walled materials in the prior art.

[0038] A balance chamber is formed between the front flange 1, the front middle flange 6, the rear middle flange 8, and the rear flange 11. Specifically, a cavity is enclosed among the front flange 1, the rolling deformation member 4, the front middle flange 6, the rear middle flange 8, the rolling deformation member 4, and the rear flange 11. The balance chamber is communicated with the lumen of the pipeline. For any rolling deformation member 4, the U-shaped opening of the rolling deformation member 4 faces the balance chamber and is communicated with the balance chamber, so that the rolling deformation member 4 can deform correspondingly with the pressure change in the pipeline.

[0039] For the U-shaped rolling deformation member 4, between the front flange 1 and the front middle flange 6, one end of the rolling deformation member 4 is connected to the front flange 1, and the other end is connected to the front middle flange 6. Between the rear flange 11 and the rear middle flange 8, one end of the rolling deformation member 4 is connected to the rear flange 11, and the other end is connected to the rear middle flange 8.

[0040] The balance principle of the expansion joint in this application is the same as that of the conventional pressure balance type expansion joint. The effective area of the balance assembly composed of the front middle flange 6 and the rear middle flange 8 is twice the effective area of the rolling deformation member 4, that is, Ap = 2×Ag

[0041] Among them, Ap is the effective area of the balance assembly; Ag is the effective area of the rolling deformation member 4;

[0042] At this time, the pressure thrust acting on the annular range where the rear middle flange 8 contacts the medium is equal to and opposite in direction to the pressure thrust acting on the annular range where the front flange 1 contacts the medium, and the force is transmitted through the tie rod structure between the rear middle flange 8 and the front flange 1, so as to achieve force balance. The force balance between the front middle flange 6 and the rear flange 11 is the same and will not be elaborated.

[0043] Regarding the connection conditions at both ends of the rolling deformation member 4, this application is further improved:

[0044] The outer cushion ring 10 and the outer compression flange 3 are sequentially arranged on the side of the front middle flange 6 away from the rear middle flange 8. The outer cushion ring 10 and the outer compression flange 3 are sequentially arranged on the side of the rear middle flange 8 away from the front middle flange 6. For any rolling deformation member 4, in addition to the connection with the middle flange structure (front middle flange 6 or rear middle flange 8), the rolling deformation member 4 is sequentially connected to the outer cushion ring 10 and the outer compression flange 3;

[0045] The inner cushion ring 12 and the inner compression flange 13 are sequentially arranged on the side of the front flange 1 close to the rear flange 11. The inner cushion ring 12 and the inner compression flange 13 are sequentially arranged on the side of the rear flange 11 close to the front flange 1. For any rolling deformation member 4, in addition to the connection with the end flange structure (front flange 1 or rear flange 11), the rolling deformation member 4 is sequentially connected to the inner cushion ring 12 and the inner compression flange 13.

[0046] Thus, through further improvement of the connection structures at both ends of the rolling deformation member 4, on the one hand, the connection reliability and sealing performance at the end positions of the rolling deformation member 4 are improved. On the other hand, by providing an outer pressing flange 3 and an inner pressing flange 13 at both ends of the rolling deformation member 4, not only is the rolling deformation member 4 restricted in the radial direction, enabling the rolling deformation member 4 to only roll and deform in the left-right direction, but also the outer pressing flange 3 and the inner pressing flange 13 can respectively bear part of the load under the pressure of the rolling deformation member 4, which is beneficial to reducing the self-pressure of the rolling deformation member 4 and further reducing the thickness of the rolling deformation member 4, and further reducing the overall stiffness of the expansion joint. Preferably, both ends of the rolling deformation member 4 are respectively welded to the above-mentioned various related components (middle flange structure, end flange structure, outer gasket ring 10, outer pressing flange 3, inner gasket ring 12, inner pressing flange 13, etc.).

[0047] For the connection between the front middle flange 6 and the rear middle flange 8, on the side of the front middle flange 6 facing the rear middle flange 8, a plug-in member is provided, on the side of the rear middle flange 8 facing the front middle flange 6, a flange groove is provided, the plug-in member is arranged in the flange groove, and the plug-in member can move left and right along the flange groove. Preferably, a seal 7 is provided between the outer wall of the plug-in member and the inner wall of the flange groove, which can provide a sealing effect for the balance cavity while ensuring the relative movement between the front middle flange 6 and the rear middle flange 8. The seal 7 can be a single-sided lip seal (such as attached Figure 3 ), or a double lip seal (such as attached Figure 4 ). Correspondingly, in this application, the structure can also be interchanged, with a flange groove provided on the front middle flange 6 and a plug-in member provided on the front middle flange 6. The assembly form and sealing form between the flange groove and the plug-in member remain unchanged and will not be elaborated. The flange groove is an annular groove, the plug-in member is also an annular member, and the seal is also an annular seal.

[0048] For the tie rod structure, the tie rod structure includes a ball head bolt 2 and a locking assembly 9. The tie rod structure has two assembly structural forms:

[0049] Form One: The ball head bolt 2 sequentially penetrates through the front flange 1 and the rear middle flange 8, and the locking assembly 9 is arranged on the side of the rear middle flange 8 away from the front flange 1 and is connected to the ball head bolt 2;

[0050] Form Two: The ball head bolt 2 sequentially penetrates through the rear flange 11 and the front middle flange 6, and the locking assembly 9 is arranged on the side of the front middle flange 6 away from the rear flange 11 and is connected to the ball head bolt 2;

[0051] In the circumferential direction of the expansion joint, Form One and Form Two are arranged alternately.

[0052] The locking assembly 9 includes a slotted nut and a spherical conical washer. Through the staggered arrangement of the tie rod structure and the use of the slotted nut and the spherical conical washer, it is beneficial to improve the ability of the expansion joint to compensate for lateral displacement. In addition, considering the possible space obstruction caused by the structural dimensions of the front middle flange 6 and the rear middle flange 8, the ball head bolt 2 in Form 1 can sequentially penetrate through the front flange 1, the front middle flange 6, and the rear middle flange 8, and the ball head bolt 2 in Form 2 can sequentially penetrate through the rear flange 11, the rear middle flange 8, and the front middle flange 6; correspondingly, the shipping nut 5 in the attached drawings is arranged on the side of the front middle flange 6 away from the rear middle flange 8 in Form 1 and is connected to the ball head bolt 2, and is arranged on the side of the rear middle flange 8 away from the front middle flange 6 in Form 2 and is connected to the ball head bolt 2. The setting of the shipping nut 5 mainly locks the relevant components of the expansion joint during the shipping process to avoid unnecessary displacement of the components during the shipping process. Correspondingly, the shipping nut 5 needs to be removed before the expansion joint is used, that is, the shipping nut 5 is not provided in the normal use state of the expansion joint.

[0053] The expansion joint includes a leakage monitoring device for detecting the breakage and leakage conditions at the rolling deformation member 4 and / or the seal 7.

[0054] For the detection at the rolling deformation member 4, it can be achieved through the first monitoring table 14; the rolling deformation member 4 is a double-layer structure, the outer gasket ring 10 is provided with a detection hole, the first monitoring table 14 is arranged outside the detection hole, and the detection end of the first monitoring table 14 penetrates through the detection hole and extends between the inner layer and the outer layer of the rolling deformation member 4 for detecting whether the inner layer of the rolling deformation member 4 is damaged and leaking.

[0055] For the detection at the seal 7, it is mainly for the detection of the double lip seal (as shown in the attached Figure 4 ) and can be achieved through the second monitoring table 15; the outer wall of the flange groove of the rear middle flange 8 (considering the structural interchange, it can also be the flange groove of the front middle flange 6) is provided with the second monitoring table 15, and the detection end of the second monitoring table 15 penetrates through the outer wall of the flange groove and communicates with the annular cavity between the plug-in member and the flange groove for detecting whether the seal 7 (especially the inner lip seal of the double lip seal) is damaged and leaking.

[0056] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A non-metallic straight pipe pressure balance type expansion joint with leakage monitoring, characterized in that, The expansion joint includes a front flange (1), a front middle flange (6), a rear middle flange (8), a rear flange (11), a tie rod structure, and a rolling deformation assembly. The front flange (1) is connected to the rear middle flange (8) through the tie rod structure. The rear flange (11) is connected to the front middle flange (6) through the tie rod structure. The front middle flange (6) and the rear middle flange (8) are connected in a manner that allows relative displacement. A rolling deformation member (4) is provided between the front flange (1) and the front middle flange (6), and a rolling deformation member (4) is provided between the rear flange (11) and the rear middle flange (8). The rolling deformation member (4) can deform in a rolling deformation manner along the left-right direction, enabling relative displacement between the front flange (1) and the front middle flange (6), and / or relative displacement between the rear flange (11) and the rear middle flange (8). A balance chamber is formed among the front flange (1), the front middle flange (6), the rear middle flange (8), and the rear flange (11). The balance chamber is communicated with the lumen of the pipeline. The U-shaped opening of the rolling deformation member (4) faces the balance chamber and is communicated with the balance chamber. On the side of the front middle flange (6) facing the rear middle flange (8), a plug-in member or a flange groove is provided. On the side of the rear middle flange (8) facing the front middle flange (6), a flange groove or a plug-in member is provided. The plug-in member is arranged in the flange groove and can move left and right along the flange groove.

2. The non-metallic straight pipe pressure balance type expansion joint with leakage monitoring according to claim 1, characterized in that, The rolling deformation member (4) is a U-shaped elastic element. The U-shaped opening of the rolling deformation member (4) faces left or right. Any one end of the rolling deformation member (4) can move relative to the other end of the rolling deformation member (4) in a form along the left-right direction, enabling the whole rolling deformation member (4) to deform in a rolling deformation manner in the left-right direction.

3. The non-metallic straight pipe pressure balance type expansion joint with leakage monitoring according to claim 1, characterized in that, Between the front flange (1) and the front middle flange (6), one end of the rolling deformation member (4) is connected to the front flange (1), and the other end is connected to the front middle flange (6). Between the rear flange (11) and the rear middle flange (8), one end of the rolling deformation member (4) is connected to the rear flange (11), and the other end is connected to the rear middle flange (8).

4. The non-metallic straight pipe pressure balance type expansion joint with leakage monitoring according to claim 1, wherein, On the side of the front middle flange (6) away from the rear middle flange (8), an outer gasket ring (10) and an outer compression flange (3) are sequentially arranged. On the side of the rear middle flange (8) away from the front middle flange (6), an outer gasket ring (10) and an outer compression flange (3) are sequentially arranged. The rolling deformation member (4) is sequentially connected to the outer gasket ring (10) and the outer compression flange (3). On the side of the front flange (1) close to the rear flange (11), an inner gasket ring (12) and an inner compression flange (13) are sequentially arranged. On the side of the rear flange (11) close to the front flange (1), an inner gasket ring (12) and an inner compression flange (13) are sequentially arranged. The rolling deformation member (4) is sequentially connected to the inner gasket ring (12) and the inner compression flange (13).

5. A non-metallic straight pipe pressure balance type expansion joint with leakage monitoring according to claim 4, characterized in that, The rolling deformation member (4) has a double-layer structure. The outer cushion ring (10) is provided with a detection hole, and a first monitoring meter (14) is arranged outside the detection hole. The detection end of the first monitoring meter (14) penetrates through the detection hole and extends between the inner layer and the outer layer of the rolling deformation member (4) for detecting whether the inner layer of the rolling deformation member (4) is damaged and leaking.

6. The non-metallic straight pipe pressure balance type expansion joint with leakage monitoring according to claim 1, characterized in that, A seal (7) is arranged between the outer wall of the plug-in member and the inner wall of the flange groove.

7. A non-metallic straight pipe pressure balance type expansion joint with leakage monitoring according to claim 6, characterized in that, A second monitoring meter (15) is arranged on the outer wall of the flange groove. The detection end of the second monitoring meter (15) penetrates through the outer wall of the flange groove and communicates with the annular cavity between the plug-in member and the flange groove for detecting whether there is damage and leakage at the seal (7).

8. A non-metallic straight pipe pressure balance type expansion joint with leakage monitoring according to claim 1, characterized in that, The tie rod structure includes a ball head bolt (2) and a locking assembly (9). The tie rod structure has two forms of assembly structures: Form 1: The ball head bolt (2) sequentially penetrates through the front flange (1) and the rear middle flange (8). The locking assembly (9) is arranged on the side of the rear middle flange (8) away from the front flange (1) and is connected to the ball head bolt (2). Form 2: The ball head bolt (2) sequentially penetrates through the rear flange (11) and the front middle flange (6). The locking assembly (9) is arranged on the side of the front middle flange (6) away from the rear flange (11) and is connected to the ball head bolt (2). In the circumferential direction of the expansion joint, Form 1 and Form 2 are arranged alternately.

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