WO2019087981A1

WO2019087981A1 - Pipe-connecting clamp

Info

Publication number: WO2019087981A1
Application number: PCT/JP2018/039948
Authority: WO
Inventors: 章一杉田
Original assignee: 日章アステック株式会社
Priority date: 2017-10-31
Filing date: 2018-10-26
Publication date: 2019-05-09
Also published as: JPWO2019087981A1; CN111279109A; TW201923272A

Abstract

[PROBLEM] To provide a pipe-connecting clamp that has a simplified structure and enables adequate detection of leakage in a flange connection part. [SOLUTION] Provided is a clamp (A1) for connecting pipes that each have a flange (92) on an end part thereof, said clamp comprising a pair of clamp bodies (1) that: extend in a semi-circular arc shape; each have on the inner-peripheral side thereof a recessed groove (11) to which a pair of flanges (92) can be fitted; and can be assembled so as to form a ring. Each clamp body (1) comprises a through-hole (13) that passes from the outer-peripheral side of said body to the recessed groove (11). The through-hole (13) is in the form of an elongated hole having a first dimension (L1) greater than a second dimension (L2), the first dimension (L1) being the length along the direction perpendicular to the axial direction of the clamp body (1) viewed in the radial direction of the clamp body (1), and the second dimension (L2) being the length in the axial direction of the clamp body (1).

Description

Pipe connection clamp

The present invention relates to a clamp for connecting pipes, and more particularly to a clamp for connecting pipes having flanges.

Conventionally, a flange joint having a flange at an end is known as a pipe joint for sending a fluid. As a connection method of the flange joint, there is a method in which a packing is interposed between the ends (flanges) of the pair of flange joints, and the flanges are sandwiched by using a pipe connection clamp. The pipe connection clamps attached to the flanges are, for example, provided with a pair of clamp bodies each extending in a semicircular arc shape, and these clamp bodies are used in a combined state to form a ring. Each clamp body has a recessed groove on the inner circumferential side. The pipe connection clamps are combined in a ring shape such that a pair of flanges fit in the recessed groove. Then, by clamping both ends of the clamp body with a fastening means such as a bolt, for example, the pair of flanges are pressed in the direction in which they approach each other, and the packing sandwiched between the pair of flanges is compressed. Thereby, when the clamp for piping connection is attached, the fluid flowing in the piping is prevented from leaking to the outside from between the pair of opposing flanges.

In this type of flange joint, when a fluid leak inspection is performed after piping, a leak inspection liquid is generally used. In a leak test using a leak test solution, if a leak occurs at a portion to which the leak test solution is attached, bubbles are generated and the leak can be detected. For this reason, it is necessary to apply the leak inspection solution around the entire circumference of the connection portion of the pair of flanges. Here, in the case of the above-described clamp for piping connection, the both ends of the pair of clamp bodies are attached so as to be positioned up and down, and the leakage inspection solution is injected from the gap between the ends of the clamp bodies located above. The leak inspection solution injected into the upper part of the flange flows from the upper part of the flange to both sides in the circumferential direction and adheres to the entire circumference of the flange or the packing. Then, the excess leak test liquid is discharged from the gap between the ends of the clamp body located below. When a leak occurs at the flange connection, bubbles generated at the leak leak out of the clamp body.

However, in the method of injecting the leak inspection solution from between the ends of the clamp body as described above, the gap between the ends of the clamp body is narrow, and a fastening bolt passes through the gap. As a result, the leak test solution can not be injected properly, and the leak test solution injected from the upper portion of the flange may not extend to both sides in the circumferential direction of the flange but may run on only one side. If the leak test liquid does not bend on one side of the flange in the circumferential direction, the leak at the flange connection can not be properly detected.

On the other hand, Patent Document 1 discloses a technique in which a resin member is interposed between a pair of flanges and a clamp body to form a leak flow path from the resin member to the clamp body. The resin member is generally ring-shaped and surrounded so as to straddle a pair of flanges. A leak port (4) is provided at an appropriate position of the clamp body. The leak port comprises a small number of holes penetrating from the outer peripheral side to the inner peripheral side of the clamp body. When a leak occurs at any part of the flange connection, the leaked fluid is collected in the space (concave groove 15) surrounded by the pair of flanges and the resin member and discharged through the leak port. The leak test can be performed by applying a leak test solution to the outlet of the leak port.

However, in the configuration described in Patent Document 1 described above, since it is necessary to separately prepare the resin member, the cost increases. Further, the work of attaching the resin member is complicated, and when the resin member is not properly attached, the leaked fluid may be dissipated to the outside of the clamp body without passing through the leak port. If such a situation is caused, the leak at the flange connection can not be detected.

JP, 2015-10621, A

The present invention has been conceived under such circumstances, and provides a clamp for piping connection capable of appropriately performing a leak inspection of a flange connection while simplifying the structure. As the main issue.

In order to solve the above problems, the present invention takes the following technical measures.

The clamp for pipe connection provided by the present invention is a clamp for connection of a pipe having a flange at an end, and each of the clamps extends in a semicircular arc shape and a concave groove in which a pair of flanges can be fitted on the inner peripheral side And a pair of clamp bodies that can be brought together to form a ring, each clamp body being provided with a through hole leading from the outer periphery to the recess A first dimension which is a length along a direction perpendicular to an axial direction of the clamp main body when viewed in a radial direction of the clamp main body is a length in the axial direction of the clamp main body; It is a long hole shape larger than 2 dimensions.

In a preferred embodiment, the through hole is provided at the center in the circumferential direction of the clamp body.

In a preferred embodiment, the first dimension is at least three times the second dimension.

In a preferred embodiment, the first dimension is 10 mm or more.

In a preferred embodiment, the through hole is provided over an angular range of 15 ° or more in the circumferential direction of the clamp body.

In a preferred embodiment, the peripheral edge connected to the concave groove in the through hole is rounded.

In a preferred embodiment, the second dimension is 1.5 mm or more.

Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

It shows an example of a clamp for pipe connection according to the present invention, and is a front view in a state of being attached to a flange joint. It is a top view of the clamp for piping connection shown in FIG. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. It is an expanded sectional view which follows the IV-IV line of FIG. It is a figure for demonstrating the effect | action of the clamp for piping connection shown in FIG. 1, and is sectional drawing similar to FIG. It is a figure for demonstrating the effect | action of the clamp for piping connection shown in FIG. 1, and is sectional drawing similar to FIG. The other example of the clamp for piping connection which concerns on this invention is shown, and it is a top view of the state attached to the flange joint. The other example of the clamp for pipe connection which concerns on this invention is shown, and it is a top view of the state attached to the flange joint.

Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

1 to 4 show an example of a pipe connection clamp according to the present invention. The pipe connection clamp A1 of the present embodiment is used by being attached to the flange joint B1. The flange joint B1 is called, for example, a ferrule and has a cylindrical tube portion 91 and a flange 92. The flange 92 is provided at one end of the cylindrical tube portion 91. As shown in FIG. 4, an annular packing groove 921 is formed on the end face of the flange 92. The pair of flange joints B1 are connected with the packing 94 interposed. Specifically, the flanges 92 of the pair of flange joints B1 are disposed to face each other, and the packing 94 is sandwiched between them. The packing 94 is formed in an annular shape, and has a pair of convex portions 941. The convex portions 941 project in opposite directions from both surfaces in the thickness direction of the packing 94, and are fitted in the packing grooves 921 of the both flanges 92 in the pair of flange joints B1. As the packing 94, different types of packings are used depending on the application of the pipe and the like, and the packing 94 can be identified by, for example, changing the color according to the type of the packing 94.

The pipe connection clamp A 1 includes a pair of clamp bodies 1. The pair of clamp bodies 1 each extend in a semicircular shape and can be combined to form a ring. A recessed groove 11 is formed on the inner peripheral side of each clamp body 1. The recessed groove 11 extends in a series along the circumferential direction of the clamp body 1. As shown in FIG. 4, the recessed groove 11 has a pair of inclined surfaces 111. The inclined surfaces 111 are spaced apart from each other in the radial direction in a cross section cut along the radial direction.

Bosses 12 are provided at both ends in the circumferential direction of the clamp body 1. In the boss portion 12, a bolt through hole 121 for bolt fastening is formed. At both ends of the pair of clamp bodies 1, the bosses 12 are opposed to each other, and the bosses 12 are fastened together using the bolt 2 and the nut 3. When the bolt 2 and the nut 3 are fastened, the pair of flanges 92 are pressed in the direction in which they approach each other, and the packing 94 sandwiched between the pair of flanges 92 is compressed. As a result, when the pipe connection clamp A1 is attached, the fluid flowing in the pipe is prevented from leaking from between the pair of opposing flanges 92 to the outside.

A through hole 13 is formed in each clamp body 1. The through hole 13 leads from the outer peripheral side of the clamp body 1 to the recessed groove 11. As shown in FIG. 2 and FIG. 3, in the present embodiment, the through hole 13 is in the form of a long hole extending along the circumferential direction of the clamp body 1. As shown in FIGS. 2 to 4, a first dimension L1 which is a length along a direction perpendicular to the axial direction of the clamp body 1 when viewed in the radial direction of the clamp body 1 corresponds to the axial direction of the clamp body 1 It is larger than the second dimension L2 which is the length.

In the present embodiment, the through hole 13 is provided at the center of the clamp body 1 in the circumferential direction. Further, the first dimension L1 of the through hole 13 is, for example, three times or more of the second dimension L2, and preferably five times or more of the second dimension L2. The first dimension L1 and the second dimension L2 of the through hole 13 are appropriately set according to the size of the pipe connection clamp A1 (size of the flange joint B1). If specific examples of these dimensions L1 and L2 are given, the first dimension L1 is 10 mm or more, for example, about 10 to 80 mm. The second dimension L2 is 1.5 mm or more, for example, about 1.5 to 10 mm. Note that an example shown in the drawings in the present embodiment shows the case where the size of the flange joint B1 is 2 inches, and the first dimension L1 is about 20 mm and the second dimension L2 is about 2 mm.

Further, as shown in FIG. 3, the through holes 13 are provided in an angular range α in the circumferential direction of the clamp body 1 and over a range of 15 ° or more. The angle range α in which the through holes 13 are provided is appropriately set according to the size of the pipe connection clamp A1 (size of the flange joint B1), and is, for example, about 15 to 90 °.

In the present embodiment, as shown in FIG. 3 and FIG. 4, the peripheral portion 131 connected to the recessed groove 11 in the through hole 13 is rounded.

Next, the operation of the present embodiment will be described.

As shown in FIG. 5, when a leak test is performed after attaching the pipe connection clamp A1 to the flange joint B1, a leak test solution is injected through the through hole 13 of the clamp main body 1 located above. The leak inspection liquid is accommodated, for example, in a container (not shown) to which the nozzle N1 (represented by an imaginary line in the drawing) is attached, and after being discharged from the tip of the nozzle N1, is applied to the connecting portion of the flange through the through hole 13. .

As described with reference to FIGS. 2 to 4, the through hole 13 has a first dimension L1 which is a length along a direction perpendicular to the axial direction of the clamp body 1 when viewed in the radial direction of the clamp body 1. Is an elongated hole larger than a second dimension L2 which is a length of the clamp body 1 in the axial direction. According to such a configuration, as shown in FIG. 5, the injection operation of the leak inspection solution can be easily performed while changing the position from the appropriate position in the longitudinal direction of the through hole 13 as appropriate. As a result, the leak test solution injected into the upper portion of the flange 92 can be divided and flowed from the upper portion of the flange 92 to both sides in the circumferential direction, and the leak test solution is attached all around the flange 92 to the packing 94 It can be done. Therefore, according to the present embodiment, it is possible to appropriately perform the leak inspection of the flange connection portion. The surplus portion of the injected leak test liquid is discharged to the outside of the pipe connection clamp A1 through the through hole 13 of the clamp main body 1 located below.

Moreover, in the present embodiment, the clamp body 1 is characterized in that the through hole 13 having a unique configuration is provided. Therefore, complication of the overall structure of the pipe connection clamp A1 is avoided.

The through holes 13 are elongated in the circumferential direction of the clamp body 1. According to such a configuration, as understood from FIG. 2 and FIG. 4 etc., the packing 94 covered with the clamp main body 1 is a through hole in a state where the pipe connection clamp A1 is attached to the flange joint B1. It can be seen from the outside through 13. Therefore, it is possible to easily determine the type of the packing 94 attached to the flange joint B1 from the outside.

In the present embodiment, the first dimension L1 (dimension in the longitudinal direction) of the through hole 13 is 10 mm or more, and is three times or more the second dimension L2 in relation to the second dimension L2. The through holes 13 are provided in an angular range α in the circumferential direction of the clamp main body 1 and in a range of 15 ° or more. Thus, an appropriate size is secured for the first dimension L1 (dimension in the longitudinal direction) of the through hole 13.

According to such a configuration, as shown in FIG. 6, the through holes 13 of the clamp main body 1 located on the upper side are at the top even if the clamp main body 1 is attached slightly offset in the circumferential direction compared with the case of FIG. From the top of the flange 92 as viewed from the side, it is located straddling the left and right in the circumferential direction of the flange 92. As a result, even in the case shown in FIG. 6, the leak inspection liquid injected into the upper portion of the flange 92 can be reliably divided and flowed from the upper portion of the flange 92 to both sides in the circumferential direction. The leak test solution can be attached over the entire circumference. Further, the through hole 13 of the lower clamp body 1 is positioned from the lowermost point of the flange 92 to the left and right in the circumferential direction of the flange 92 when viewed from below. As a result, even in the case of FIG. 6, the surplus of the injected leak test liquid is discharged through the through hole 13 of the clamp main body 1 located below. Therefore, according to the present embodiment, while the leak inspection can be appropriately performed, the workability at the time of attachment of the pipe connection clamp A1 is also excellent.

The peripheral edge portion 131 connected to the recessed groove 11 in the through hole 13 is rounded. According to such a configuration, generation of burrs and the like in the peripheral portion 131 of the through hole 13 can be avoided when the clamp body 1 is manufactured, and through the through hole 13 of the clamp body 1 located below in the leak inspection. The leak test solution discharged is smoothly discharged without any obstruction of the flow.

7 and 8 show another example of a pipe connection clamp according to the present invention. In the drawings after FIG. 7, the same or similar elements as or to those of the embodiment described above are designated by the same reference numerals, and the description thereof will be appropriately omitted.

In the pipe connection clamp A2 shown in FIG. 7, the configuration of the through hole 13 is different from the above-described pipe connection clamp A1. In the present embodiment, the through holes 13 are inclined so as to intersect the circumferential direction of the clamp body 1. Also in the pipe connection clamp A2 of the present embodiment, the same function and effect as the above-described pipe connection clamp A1 can be obtained.

In the pipe connection clamp A3 shown in FIG. 8, the configuration of the through hole 13 is different from the above-described pipe connection clamp A1. In the present embodiment, the through holes 13 are inclined so as to intersect the circumferential direction of the clamp body 1. Further, a plurality of (three in the present embodiment) through holes 13 are provided, and these through holes 13 are provided at intervals in the circumferential direction of the clamp main body 1. Also in the pipe connection clamp A3 of the present embodiment, the same function and effect as the above-described pipe connection clamp A1 can be obtained.

As mentioned above, although specific embodiment of this invention was described, this invention is not limited to this, A various change is possible within the range which does not deviate from the thought of invention. The specific configuration of each part of the pipe connection clamp according to the present invention can be varied in design in many ways. The clamp for pipe connection according to the present invention is not limited to the type in which the clamp main body 1 of two splits shown in the above embodiment is fastened with a bolt and a nut, for example, a pair of clamp main bodies are connected by a hinge or the like. It is good also as composition.

Claims

A connecting clamp for a pipe having a flange at its end,
A pair of clamp bodies, each extending in a semicircular arc shape and having a recessed groove on the inner peripheral side into which a pair of flanges can fit, forming a ring; Equipped
Each clamp body is provided with a through hole communicating with the recessed groove from the outer peripheral side,
The first dimension, which is a length along the direction perpendicular to the axial direction of the clamp body when viewed in the radial direction of the clamp body, is the second dimension in which the through hole has a length in the axial direction of the clamp body Clamp for piping connection, which is elongated hole shape larger than.
The pipe connection clamp according to claim 1, wherein the through hole is provided at the center in the circumferential direction of the clamp body.
The pipe connection clamp according to claim 1, wherein the first dimension is three or more times the second dimension.
The pipe connection clamp according to any one of claims 1 to 3, wherein the first dimension is 10 mm or more.
The pipe connection clamp according to any one of claims 1 to 4, wherein the through hole is provided over an angle range of 15 ° or more in a circumferential direction of the clamp body.
The piping connection clamp according to any one of claims 1 to 5, wherein a peripheral edge portion connected to the concave groove in the through hole is rounded.