Staggered flange under-pressure leaking stoppage clamp

Abstract

The utility model discloses a dislocation flange under-pressure leaking stoppage clamp, which relates to the field of flange clamps and comprises a first flange clamp and a second flange clamp, a plurality of first connecting holes are arranged on the first flange clamp, and a plurality of second connecting holes are arranged on the second flange clamp. A first bolt penetrates through each pair of the first connecting hole and the second connecting hole which are communicated with each other, the two ends of each first bolt are each sleeved with a first nut, and each of the first flange clamp and the second flange clamp comprises a first clamping part and a second clamping part which are movably connected; when the end face of the first clamping part is connected with the end face of the second clamping part, the first flange clamp and the second flange clamp form a closed through hole, and the outer diameter of the first bolt is smaller than the inner diameter of the first connecting hole and / or the second connecting hole. The first connecting hole and the second connecting hole are formed in the first flange clamp and the second flange clamp, so that the purposes that the adjusting space is large during installation, and the leaking stoppage position of a staggered flange is accurate and firm are achieved.

Description

Technical Field

[0001] The utility model relates to the field of flange clamps, in particular to a misaligned flange pressure plugging clamp. Background Art

[0002] Due to the process and design of petroleum and natural gas chemical plants, some parts of the system cannot be isolated from the medium alone during the production process. The non-stop pressure plugging technology can re-establish a new sealing structure at the leaking part as soon as possible without affecting the normal operation and destroying the original sealing structure, and eliminate the leakage safely and reliably under temperature and pressure, so that the device can operate normally to avoid huge economic losses caused by shutdown. Therefore, the non-stop pressure plugging technology is used. The installed new sealing structure has a high degree of fit and strength with the leaking parts to meet the needs of resealing. It can reduce the unplanned shutdown of the system, thereby ensuring the long-term operation of the device and eliminating the risk of accidents such as fire and explosion caused by leaking media.

[0003] At present, there are many problems in the design, processing and installation of fixtures for sealing misaligned flanges. For example, it is difficult to make the sealing fixtures, the eccentricity angle is not easy to control accurately, and the finished products cannot meet the sealing requirements. At the same time, it is difficult to accurately control the installation angle during assembly and installation, resulting in a decrease in the fit between the fixture and the surface of the leaking part.

[0004] In view of this, this application is hereby filed. Utility Model Content

[0005] The utility model aims to provide a misaligned flange pressure plugging clamp, which solves the problem of inaccurate plugging position caused by difficulty in adjustment during installation in the prior art by configuring the clamp to be a first flange clamp and a second flange clamp that can overlap, arranging a first connecting hole and a second connecting hole on the flange clamp, and then passing a first bolt with a smaller outer diameter through the first connecting hole and the second connecting hole to connect the first flange and the second flange.

[0006] The utility model embodiment is realized by the following technical scheme: the utility model embodiment provides a misaligned flange pressure plugging clamp, including a first flange clamp and a second flange clamp, the first flange clamp is provided with a plurality of first connecting holes, the second flange clamp is provided with a plurality of second connecting holes, when the first flange clamp and the second flange clamp are placed overlapping, each first connecting hole is communicated with a single second connecting hole;

[0007] A first bolt is passed through each pair of the first connecting holes and the second connecting holes that are connected to each other, and a first nut is sleeved on both ends of the first bolt, wherein the first nut at one end is arranged on the outer side of the first flange clamp, and the first nut at the other end is arranged on the outer side of the second flange clamp;

[0008] The first flange clamp and the second flange clamp both include a first clamping portion and a second clamping portion that are movably connected. When the end surface of the first clamping portion is connected to the end surface of the second clamping portion, the first flange clamp and the second flange clamp form a closed through hole. When the end surfaces of the first clamping portion and the second clamping portion are separated, the through hole is in an open state.

[0009] The outer diameter of the first bolt is smaller than the inner diameter of the first connecting hole and / or the second connecting hole.

[0010] Preferably, the outer diameter of the first bolt is smaller than the inner diameters of the first connecting hole and the second connecting hole, and the inner diameters of the first connecting hole and the second connecting hole are equal.

[0011] Preferably, the outer diameter of the first bolt is d 1 , the inner diameter of the first connecting hole is d 2 , where 2mm>d 2 -d 1 >7mm.

[0012] Preferably, the first clamping portion includes two first end faces, the second clamping portion includes two second end faces, a first ear plate is respectively arranged on the side faces next to the two first end faces, a second ear plate is respectively arranged on the side faces next to the two second end faces, each first ear plate and each second ear plate are provided with ear holes, the ear hole on one of the first ear plates and the ear hole on one of the second ear plates are simultaneously penetrated by a second bolt, the ear hole on the other first ear plate and the ear hole on the other second ear plate are also penetrated by a second bolt, and a second nut is provided at both ends of each second bolt.

[0013] Preferably, the first clamping portion is hinged to the second clamping portion at one end, and the other end is detachably connected, and the detachable connection is a bolt connection.

[0014] Preferably, the first flange clamp and / or the second flange clamp is provided with an injection hole, and the injection hole is connected to the inner side wall of the through hole.

[0015] Preferably, an injection groove is provided on the inner side wall of the first flange clamp and / or the second flange clamp, and the injection groove is connected to the injection hole.

[0016] Preferably, the cross-sections of the first clamping portion and the second clamping portion are both semi-circular, and the closed shape of the through hole is cylindrical.

[0017] Preferably, the first connection holes and the second connection holes are both arranged in a ring array, and the number of the arranged holes is an even number.

[0018] Preferably, a rubber gasket is provided between the first nut on one side of the first flange clamp and the first flange clamp, and a rubber gasket is also provided between the first nut on one side of the second flange clamp and the second flange clamp.

[0019] Compared with the prior art, the embodiments of the present invention have the following advantages and beneficial effects:

[0020] 1. A clamp for plugging leaks with pressure on a misaligned flange provided in an embodiment of the utility model is used for installation on the outer side of the misaligned flange, the clamp is provided with a first flange plate and a second flange plate, and the first flange plate and the second flange plate both include a first clamping portion and a second clamping portion, when the end face of the first clamping portion is connected to the end face of the second clamping portion, the first flange clamp and the second flange clamp form a closed through hole, when the end faces of the first clamping portion and the second clamping portion are separated, the through hole is in an open state, during the installation operation, the end faces of the first clamping portion and the second clamping portion can be separated first, and the first clamping portion and the second clamping portion can be sleeved on the outer side of the misaligned flange, after the installation position is preliminarily determined, the end faces of the first clamping portion and the second clamping portion are brought close together and then connected to realize the fastening and clamping of the misaligned flange, that is, in the clamping state, the misaligned flange is arranged in the through hole, when the clamp provided in the embodiment of the utility model is needed, it is only necessary to separate the end faces of the first clamping portion and the second clamping portion;

[0021] In an embodiment of the utility model, the first flange clamp and the second flange clamp are a movably connected structure, which provides space for position adjustment before the entire clamp is installed on the offset flange and is completely fixed, thereby providing a more precise plugging effect. Specifically, a first connecting hole is set on the first flange clamp, and a second connecting hole is set on the second flange clamp. When the first flange clamp and the second flange clamp are placed overlapping, each first connecting hole is connected to a single second connecting hole. The connecting structure allows the first bolt to pass through the first connecting hole and the second connecting hole together, and then a first nut is respectively set on both sides of the first bolt to realize the fixed connection between the first flange clamp and the second flange clamp, wherein the outer diameter of the first bolt is smaller than the inner diameter of the first connecting hole and / or the second connecting hole, so that the first flange clamp and the second flange clamp have a certain offset and offset angle for adjustment when paired. There is no need to find the maximum end of the offset in advance during installation. It is only necessary to move the first flange clamp and the second flange clamp, and the difference between the diameter of the first connecting hole and / or the second connecting hole and the first bolt to compensate for the flange offset, so as to achieve the pressure plugging sealing requirement, and then screw the first nut and the first bolt together to fix it.

[0022] 2. The difference between the inner diameter of the connecting hole and the outer diameter of the first bolt is set to a range of 2mm-7mm. Compared with the existing fitting structure of the bolt and the connecting hole, it is more adjustable, allowing the second connecting hole connected to the first connecting hole to be appropriately misaligned to compensate for the misaligned displacement of the misaligned flange, so as to improve the leak-proof fit and accuracy of the clamp.

[0023] In general, an embodiment of the utility model provides a misaligned flange pressure plugging clamp, which is configured to be a first flange clamp and a second flange clamp that can overlap, a first connecting hole and a second connecting hole are provided on the flange clamp, and then a first bolt with a smaller outer diameter is passed through the first connecting hole and the second connecting hole to connect the first flange plate and the second flange plate, so as to achieve a large adjustment space during installation and accurate and firm plugging position of the misaligned flange. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the structure of the misaligned flange pressure plugging fixture provided in an embodiment of the utility model;

[0026] Figure 2 A side view of the misaligned flange pressure plugging fixture provided by the embodiment of the utility model;

[0027] Figure 3 This is a diagram of the installation structure of the offset flange pressure plugging fixture provided in an embodiment of the utility model.

[0028] Marks and corresponding parts names in the attached drawings:

[0029] 1-first flange clamp, 2-second flange clamp, 3-first nut, 4-first clamping part, 5-second clamping part, 6-through hole, 7-first ear plate, 8-second ear plate, 9-second nut, 10-injection hole, 11-injection groove, 12-rubber gasket, 13-first bolt, 14-second bolt, 15-first connecting hole, 16-second connecting hole, 17-offset flange. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. The components of the embodiment of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the present invention, it should be noted that the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0034] Example

[0035] like Figure 1-3 As shown, the embodiment of the utility model provides a pressure-sealing clamp for misaligned flange 17, which is used to be installed on the outside of the misaligned flange 17 and is used to seal the gap after the flange is misaligned. Specifically, it includes a first flange clamp 1 and a first flange clamp 2. When installed, the first flange clamp 1 and the first flange clamp 2 are parallelly sleeved on the misaligned flange 17 to clamp the misaligned flange 17 together. In the embodiment of the utility model, the first flange clamp 1 and the first flange clamp 2 are movably connected. Specifically, the first flange clamp 1 is provided with a plurality of first connecting holes 15, and the first flange clamp 2 is provided with a plurality of second connecting holes 16. When the first flange clamp 1 and the first flange clamp 2 are placed overlapping, each first connecting hole 16 is provided. The connection holes 15 are all connected to a single second connection hole 16; each pair of interconnected first connection holes 15 and second connection holes 16 is penetrated by a first bolt 13, and a first nut 3 is respectively sleeved on both ends of the first bolt 13, wherein the first nut 3 at one end is arranged on the outer surface of the first flange clamp 1, and the first nut 3 at the other end is arranged on the outer surface of the first flange clamp 2; that is, the connection structure of the first flange clamp 1 and the first flange clamp 2 is to penetrate the first bolt 13 through the first connection hole 15 and the second connection hole 16 at the same time, and then set a first nut 3 on both sides of the first flange clamp 1 and the first flange clamp 2 respectively, so as to fix the first flange clamp 1 and the first flange clamp 2. It should be noted that the number of the first connection holes 15 and the second connection holes 16 here is equal and the specific number is not limited, and can be set according to the size of the clamp of the utility model, as long as sufficient connection stability can be achieved, and the first connection hole 15 can be set to one, two, three, four, etc.

[0036] At the same time, the first flange clamp 1 and the first flange clamp 2 both include a first clamping portion 4 and a second clamping portion 5 that can be movably connected. When the end face of the first clamping portion 4 is connected to the end face of the second clamping portion 5, the first flange clamp 1 and the first flange clamp 2 form a closable through hole 6. When the end faces of the first clamping portion 4 and the second clamping portion 5 are separated, the through hole 6 is in an open state. Specifically, the first flange clamp 1 and the first flange clamp 2 are spliced ​​by the first clamping portion 4 and the second clamping portion 5. The movable connection between the first clamping portion 4 and the second clamping portion 5 can limit the opening of the through hole 6. When the entire first flange clamp 1 and the first flange clamp 2 are sleeved on the offset flange 17, if the through hole 6 is in an open state, the clamp and the offset flange 17 are relatively loose, because during the installation process, the offset flange 17 is located in the through hole 6. When the through hole 6 is closed, the inner wall of the through hole 6 will gradually fit with the outer wall of the offset flange 17 until the clamp generates a clamping force on the offset flange 17 and blocks the offset gap. At this time, the first clamping part 4 and the second clamping part 5 can be connected and limited to ensure that the entire clamp stably clamps the offset flange 17. It should be noted that the connection between the first clamping member and the end face of the second supporting member here generally refers to a movable connection. Of course, in other embodiments, it can also be a fixed connection, which is not limited here. As a preferred embodiment of the utility model, in order to improve the flexibility and practicality of the entire clamp, the first clamping member and the end face of the second supporting member are movably connected. In the embodiment of the utility model, the outer diameter of the first bolt 13 is set to be smaller than the inner diameter of the first connecting hole 15 and / or the second connecting hole 16. In this way, during the connection process of the first flange clamp 1 and the first flange clamp 2, the first flange clamp 1 and the first flange clamp 2 have a certain offset and offset angle for adjustment when they are paired. During installation, there is no need to find the maximum end of the misalignment in advance. It is only necessary to move the first flange clamp 1 and the first flange clamp 2, and compensate for the flange misalignment by the difference in diameter between the first connecting hole 15 and / or the second connecting hole 16 and the first bolt 13 to achieve the pressure-sealing requirement, and then screw the first nut 3 and the first bolt 13 together to fix them.

[0037] It should be noted that the sizes of the first connection hole 15 and the second connection hole 16 can be set to be equal or unequal, and there is no restriction here, as long as the first bolt 13 can be penetrated. For example, the inner diameter of the first connection hole 15 is equal to the outer diameter of the first bolt 13, and the inner diameter of the second connection hole 16 is larger than the outer diameter of the first bolt 13; for another example, the inner diameter of the first connection hole 15 is larger than the outer diameter of the first bolt 13, and the inner diameter of the second connection hole 16 is larger than the outer diameter of the first bolt 13. As a preferred embodiment of the utility model, the outer diameter of the first bolt 13 is set to be smaller than the inner diameters of the first connection hole 15 and the second connection hole 16, and the inner diameters of the first connection hole 15 and the second connection hole 16 are equal. This structure can realize the simultaneous adjustment function of the first bolt 13 in the first connection hole 15 and the second connection hole 16. Setting the inner diameters of the first connection hole 15 and the second connection hole 16 to be the same can also simplify processing and increase the accuracy of adjustment. More preferably, the outer diameter of the first bolt 13 is set to d 1 , the inner diameter of the first connecting hole 15 is set to d 2 , where 2mm>d 2 -d 1 >7mm. Within this size difference range, not only the misalignment compensation range between the first flange clamp 1 and the first flange clamp 2 can be guaranteed, but also the connection stability between the first flange clamp 1 and the first flange clamp 2 can be guaranteed.

[0038] For ease of understanding, the cross-sections of the first clamping portion 4 and the second clamping portion 5 of the embodiment of the utility model are both semi-circular, and the closed shape of the through hole 6 is cylindrical, that is, the entire clamp is in the shape of a cylinder, which can reduce unnecessary damage and waste of materials caused by the edges of the clamp. Of course, in other embodiments, the cross-sectional shapes of the first clamping portion 4 and the second clamping portion 5 are not restricted, and the outer edges can be quadrilaterals, pentagons, etc. The shape of the through hole 6 is generally set according to the structure of the offset flange 17, and is not restricted in other embodiments. For ease of understanding, in the subsequent description, the cross-sections of the first clamping portion 4 and the second clamping portion 5 are described as semi-circular, and the through hole 6 is described as cylindrical.

[0039] In order to improve the flexibility of the clamp, the connection structure between the first clamping part 4 and the second clamping part 5 can be limited. Specifically, the first clamping part 4 includes two first end faces, and the second clamping part 5 includes two second end faces. A first ear plate 7 is respectively arranged on the side faces next to the two first end faces, and a second ear plate 8 is respectively arranged on the side faces next to the two second end faces. Each first ear plate 7 and each second ear plate 8 are provided with ear holes, and the ear holes on one of the first ear plates 7 and the ear holes on one of the second ear plates 8 are penetrated by a second bolt 14 at the same time, and the ear holes on the other first ear plate 7 and the ear holes on the other second ear plate 8 are also penetrated by a second bolt 14, and each second bolt 14 is provided with a second nut 9 at both ends. This structure realizes the closed connection between the first clamping part 4 and the second clamping part 5 by simultaneously passing the second bolt 14 through the first ear plate 7 and the second ear plate 8, and then tightening them through the second nut 9. Of course, in other embodiments, it is not limited to the above structure, as long as the through hole 6 can be opened freely and can achieve a firm clamping effect after closing.

[0040] Exemplarily, the first clamping portion 4 is hinged at one end to the second clamping portion 5, and the other end is detachably connected, and the detachable connection method is a bolt connection method, that is, one end of the first clamping portion 4 and the second clamping portion 5 of the structure is connected by a hinged manner, and the other end is detachable. The detachable end of the first clamping portion 4 and the second clamping portion 5 can be used to open and close the through hole 6, thereby realizing the installation and disassembly of the flange clamp. When the through hole 6 needs to be closed, the detachable ends of the first clamping portion 4 and the second clamping portion 5 are fixedly connected by bolts.

[0041] Furthermore, the first flange clamp 1 and / or the first flange clamp 2 are provided with an injection hole 10, and the injection hole 10 is connected to the inner wall of the through hole 6. This structure allows the sealant to be injected through the injection hole 10, and the sealant will enter the inner wall of the through hole 6, and finally reach the gap of the offset flange 17, and work together with the mechanical seal of the clamp to improve the plugging effect of the offset flange 17. Preferably, the first flange clamp 1 and / or the first flange clamp 2 are provided with an injection groove 11 on the inner wall, and the injection groove 11 is connected to the injection hole 10. By providing the injection groove 11, the injection can be made to flow more smoothly through the clamp, alleviate the influence of flow velocity and hydraulic pressure, and make the injection more evenly distributed inside the clamp, further improving the sealing performance of the clamp. As a preferred embodiment of the present invention, the first connection holes 15 and the second connection holes 16 are both arranged in an annular array, and the number of the arrangement is an even number, for example, two, four, six, etc. By arranging an even number of the first connection holes 15 and the second connection holes 16, when the first flange clamp 1 and the first flange clamp 2 are displaced, they can reach the maximum end of the misalignment, achieve a greater tolerance for misalignment, and improve the scope of application and flexibility of the clamp. It should be noted that in other embodiments, the plurality of first connection holes 15 and the second connection holes 16 are not limited to the annular array arrangement, as long as the purpose of stable connection can be achieved. Of course, in the embodiment of the present invention, the arrangement of the annular array can improve the uniformity of the connector and the connection stability of the entire device.

[0042] In order to further improve the anti-slip property of the first nut 3 and reduce the wear of the first nut 3 on the flange clamp, a rubber gasket 12 is arranged between the first nut 3 on one side of the first flange clamp 1 and the first flange clamp 1, and a rubber gasket 12 is also arranged between the first nut 3 on one side of the first flange clamp 2 and the first flange clamp 2. The preferred thickness of the rubber gasket 12 is 0.5-2mm. This structure also utilizes the elasticity and sealing performance of the rubber gasket 12 to ensure that the first bolt 13 and the first nut 3 are connected more tightly and firmly.

[0043] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model. It should be noted that the structures or components illustrated in the drawings are not necessarily drawn to scale, and the utility model omits the description of known components and processing technologies and processes to avoid unnecessary limitations on the utility model.

Claims

1. A misaligned flange pressure plugging clamp, comprising a first flange clamp (1) and a second flange clamp (2), characterized in that: The first flange clamp (1) is provided with a plurality of first connection holes (15), and the second flange clamp (2) is provided with a plurality of second connection holes (16), and when the first flange clamp (1) and the second flange clamp (2) are placed overlapping, each of the first connection holes (15) is communicated with a single second connection hole (16); A first bolt (13) is inserted through each pair of mutually connected first connecting holes (15) and second connecting holes (16), and a first nut (3) is sleeved on both ends of the first bolt (13), wherein the first nut (3) at one end is arranged on the outer side surface of the first flange clamp (1), and the first nut (3) at the other end is arranged on the outer side surface of the second flange clamp (2); The first flange clamp (1) and the second flange clamp (2) both comprise a first clamping portion (4) and a second clamping portion (5) that are movably connected. When the end surface of the first clamping portion (4) is connected to the end surface of the second clamping portion (5), the first flange clamp (1) and the second flange clamp (2) form a closed through hole (6). When the end surfaces of the first clamping portion (4) and the second clamping portion (5) are separated, the through hole (6) is in an open state. The outer diameter of the first bolt (13) is smaller than the inner diameter of the first connecting hole (15) and / or the second connecting hole (16).

2. The misaligned flange pressure plugging fixture according to claim 1 is characterized in that: The outer diameter of the first bolt (13) is smaller than the inner diameters of the first connecting hole (15) and the second connecting hole (16), and the inner diameters of the first connecting hole (15) and the second connecting hole (16) are equal.

3. The misaligned flange pressure plugging fixture according to claim 2 is characterized in that: The outer diameter of the first bolt (13) is d1, and the inner diameter of the first connecting hole (15) is d2, wherein 2mm>d2-d1>7mm.

4. The misaligned flange pressure plugging fixture according to claim 1 is characterized in that: The first clamping portion (4) comprises two first end faces, and the second clamping portion (5) comprises two second end faces. A first ear plate (7) is respectively arranged on the side faces next to the two first end faces, and a second ear plate (8) is respectively arranged on the side faces next to the two second end faces. Each of the first ear plates (7) and each of the second ear plates (8) is provided with an ear hole. A second bolt (14) is simultaneously passed through the ear hole on one of the first ear plates (7) and the ear hole on one of the second ear plates (8), and a second bolt (14) is simultaneously passed through the ear hole on the other first ear plate (7) and the ear hole on the other second ear plate (8), and a second nut (9) is provided at both ends of each of the second bolts (14).

5. The misaligned flange pressure plugging fixture according to claim 1 is characterized in that: The first clamping part (4) and the second clamping part (5) are hinged at one end and detachably connected at the other end, and the detachable connection is a bolt connection.

6. The misaligned flange pressure plugging fixture according to claim 5 is characterized in that: The first flange clamp (1) and / or the second flange clamp (2) is provided with an injection hole (10), and the injection hole (10) is connected to the inner wall of the through hole (6).

7. The misaligned flange pressure plugging fixture according to claim 6 is characterized in that: An injection groove (11) is provided on the inner side wall of the first flange clamp (1) and / or the second flange clamp (2), and the injection groove (11) is connected to the injection hole (10).

8. The misaligned flange pressure plugging fixture according to claim 7 is characterized in that: The cross-sections of the first clamping portion (4) and the second clamping portion (5) are both semi-circular, and the closed shape of the through hole (6) is cylindrical.

9. The misaligned flange pressure plugging fixture according to claim 1 is characterized in that: The first connection holes (15) and the second connection holes (16) are both arranged in a ring array, and the number of the arranged holes is an even number.

10. The misaligned flange pressure plugging fixture according to claim 1, characterized in that: A rubber gasket (12) is provided between the first nut (3) on one side of the first flange clamp (1) and the first flange clamp (1), and a rubber gasket (12) is also provided between the first nut (3) on one side of the second flange clamp (2) and the second flange clamp (2).

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