JPH0979222A - Clamp for piping flange - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a liquid leakage surely from occurring by installing plural pieces of blocks circularly in each outer peripheral part of two piping flanges in succession, inserting a clamping force transmitting means slidably into these blocks, and clamping the one end to the block and connecting the other end to the block through a detachable clamping means. SOLUTION: A lower end of a knob 143 is made into a state of coming off a spherical seat 122a of a block 12, and a clamp 10 is installed in the circumference of flanges 70 as inserting a outer peripheral part 72 into two grooves 111 and 121. Next, the lower end of the knob 143 is engaged with the spherical seat 122a and then, when this knob is rotated and a thread part 141 is clamped tight, a belt member 13 is pulled in a T-type groove 112, both blocks 11 and 12 are pushed in the radial direction, two fitting surfaces 111a and 121a of both groove parts 111 and 121 shift in the radial direction as coming into contact with a fitting surface 72a, whereby an interval between two peripheral parts 72 is pushed and narrowed in the axial direction, and thereby an O-ring 74b is closely contacted with a flange surface 70a, and thus both flanges 70 are joined together via a center ring 74. Therefore any fluid leakage is preventable from occurring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe flange clamp, and more particularly to a pipe flange clamp used when connecting NW type flanges at the ends of pipes connected to a sanitary device or a vacuum device. Regarding

[0002]

2. Description of the Related Art FIG. 6 is a schematic view showing an NW type flange and a conventional clamp for piping flanges of this type.
Is a front view and (b) is a sectional view taken along line I-I in (a). The pipe connecting portion 71 is formed of, for example, stainless steel into a substantially cylindrical shape having an inner radius R ₁ and an outer radius R ₂ .
An outer peripheral portion 72 having an outer radius of R ₃ extends outward from one end of the pipe connecting portion 71, and a fitting surface 72 of the outer peripheral portion 72 is provided.
a is formed in a tapered shape. These pipe connections 7
1. Including ISO (International Standar)
A dW organization standard NW type flange (hereinafter simply referred to as a flange) 70 is configured. A pipe 73 made of, for example, stainless steel is provided on the other end side of the pipe connecting portion 71, and a groove portion 73a is formed at the end portion of the pipe 73. The flange 70 and the pipe 73 are connected by bringing the end face into contact with each other and welding the groove portion 73a. A center ring 74, for example, is interposed between the two flanges 70. The center ring 74 has a stainless steel ring body 74a having a step 74a _1.
And an O-ring 74b having a substantially circular cross section disposed on the outer peripheral portion of the ring body 74a.

On the other hand, the flange 70 and the center ring 7
Clamp bodies 61 and 62 having a substantially rectangular cross-section and a substantially semicircular shape in a front view are arranged to face each other on the outer periphery of 4, and the radii R ₄ are provided on the inner peripheral portions of the clamp bodies 61 and 62. Groove portions 61a and 62a are formed,
The fitting surfaces 61b and 62b of 62a are set in the same tapered shape as the fitting surface 72a. Clamp body 61, 62
While one end of the screw body 641 is rotatably supported by the connecting body 63 via the connecting pin 63a, one end of the screw portion 641 is rotatably supported by the other end of the clamp body 61 via the pin 64a. The wing nut portion 6 is attached to the other end of the screw portion 641.
42 is screwed together. A groove 643 is formed at a predetermined position on the other end of the clamp body 62.
The other end of the screw portion 641 is detachably engaged with the screw 3. These screw parts 641, wing nut parts 642, groove parts 64
The tightening means 64 is configured to include 3 and the like. And two flanges 70 with a center ring 74 interposed
When the outer peripheral portion 72 of the clamp body 61, 62 is inserted into the groove portions 61a, 62a and the clamp main bodies 61, 62 are tightened by using the tightening means 64, the lower surfaces of the clamp main bodies 61, 62 do not contact the outer peripheral surface of the pipe connecting portion 71. It is set. A split type pipe flange clamp 60 including the clamp bodies 61 and 62, the connecting body 63, the tightening means 64, and the like.
Is configured.

When the pipe flange clamp 60 having such a structure is used, first, the screw portion 641 is formed into the groove portion 643.
With the connecting pin 63a as the center of rotation, the clamp bodies 61 and 62 are rotated in the direction of arrow K to open. Next, after rotating the clamp bodies 61 and 62 in the direction of arrow L to close while inserting the outer peripheral portion 72 into the groove portions 61a and 62a, the screw portion 641 is inserted into the groove portion 643 and the wing nut portion 642 is closed by a predetermined amount. wear. Then, the clamp bodies 61 and 62 are pushed in the radius (center) direction,
The fitting surfaces 61b and 62b of the grooves 61a and 62a are the fitting surface 7
It moves in the radius (center) direction while being in contact with 2a, and as a result, the outer peripheral portions 72 are narrowed in the axial direction. When the flange surface 70a and the stepped portion 74a ₁ abuts, with O-ring 74b comes into close contact with the flange surface 70a, and if the flange 70 through the center ring 74 is coupled.

FIG. 7 is a schematic view showing a NW type flange and the like and another conventional piping flange clamp. FIG. 7A is a front view and FIG. 7B is a sectional view taken along line JJ in FIG. is there. The flange 70 and the center ring 74 are configured similarly to those shown in FIG. 6, and a plurality of blocks 81 to 83 each having a substantially rectangular parallelepiped shape are arranged on the outer periphery of the flange 70 and the center ring 74. 83 is formed by a resin injection molding method into a mold. Further, a groove portion 811 having a radius R ₄ is provided on the inner peripheral portion of the blocks 81 to 83.
831 are respectively formed, and the fitting surfaces 811a to 831a of the groove portions 811 to 831 are set in the same tapered shape as the fitting surface 72a. A connecting plate 84 having a predetermined length is arranged between the blocks 81 to 83, and the connecting plate 84 and the blocks 81 to 83 are rotatably supported by a connecting pin 84a. A hole (not shown) is formed at a predetermined position of the block 82, and a stopper portion 851 is formed in this hole.
The screw part 851 having a is inserted,
The front end of 1 is screwed into a screw hole (not shown) formed in the block 83. The tightening means 85 is configured to include the screw portion 851, the screw hole, and the like. And two flanges 70 with a center ring 74 interposed
When the outer peripheral portion 72 of the is inserted into the groove portions 811 to 831 and the blocks 81 to 83 are tightened using the tightening means 85,
The lower surfaces of the blocks 81 to 83 are set so as not to contact the outer peripheral surface of the pipe connecting portion 71. These blocks 81
˜83, the connecting plate 84, the tightening means 85, and the like, a chain-type pipe flange clamp 80 is configured.

In the case of using the pipe flange clamp 80 having such a structure, first, the threaded portion 851 is provided in the block 8.
3 and the connection pins 84a are set as rotation centers, and the blocks 81 to 83 and the connection plate 8 are provided.
Rotate 4 in the direction of arrow K to open it. Next, the groove 811
831 while inserting the outer peripheral portion 72 into the block 81-
83, the connecting plate 84 is rotated in the direction of the arrow L to close,
The screw portion 851 is screwed into the screw hole and tightened until the stopper portion 851a comes into contact with the end surface of the block 82.
Then, the blocks 81 to 83 and the connecting plate 84 are pushed in the radius (center) direction while being pulled in the circumferential direction. Then, the fitting surfaces 811a to 831a of the groove portions 811 to 831 move in the radius (center) direction while being in contact with the fitting surface 72a, and as a result, the outer peripheral portions 72 are narrowed in the axial direction. When the flange surface 70a and the stepped portion 741a come into contact with each other, the O-ring 74b comes into close contact with the flange surface 70a, and the flanges 70 are joined together via the center ring 74.

[0007]

In the above-mentioned split type pipe flange clamp 60, when the clamp bodies 61 and 62 are tightened by using the tightening means 64, the radius near the center of the clamp bodies 61 and 62 is increased. The amount of movement in the direction becomes relatively large, while the amount of movement of the clamp bodies 61, 62 in the vicinity of the connecting body 63 and the tightening means 64 in the radial direction becomes relatively small. As a result, the tightening force is unbalanced, and so-called uneven tightening is likely to occur.
The chain type pipe flange clamp 8 described above
0, the block 81 is tightened by using the tightening means 85.
When ~ 83 is tightened, frictional resistance is generated between the fitting surfaces 811a-831a and the fitting surface 72a. As a result, the block 81 is less likely to be pulled in the circumferential direction as it moves away from the blocks 82, 83, and the movement of the block 81 in the radial direction is prevented. As a result, imbalance in the tightening force is likely to occur. Then, the flange surface 70a and the O-ring 74b
The fluid easily leaks from the portion where the tightening force between and is weak, especially when the pressure or vacuum degree in the flange 70 and the pipe 73 is relatively high or the diameters of the flange 70 and the pipe 73 are relatively large. However, there is a problem that it is difficult to stably use.

In the chain type pipe flange clamp 80 described above, when the blocks 81 to 83 are made of resin, they are formed by an injection molding method, and when they are made of aluminum, they are formed by a die casting method. Since the mold cost is high, there is a problem that the manufacturing cost is relatively high.

The present invention has been made in view of the above problems, and it is possible to surely prevent the fluid from leaking out by uniformly tightening the flange, and whether the pressure or vacuum in the flange and the pipe is high. Alternatively, it is an object of the present invention to provide a pipe flange clamp that can be stably used even when these diameters are large and can reduce the manufacturing cost.

[0010]

In order to achieve the above object, a pipe flange clamp according to the present invention comprises a plurality of blocks each having a groove portion that fits on the outer peripheral portion of two pipe flanges. The tightening force transmitting means is slidably inserted through the insertion portion formed in the block continuously arranged in a circular shape, and one end of the tightening force transmitting means is fixed to a predetermined block. The other end of the tightening force transmission means is connected to a tightening means detachably engaged with a predetermined block (1).

According to the above-mentioned pipe flange clamp (1), when the block is tightened by using the tightening means, the direction of tightening is provided between the fitting surfaces of the groove portion and the outer peripheral portion of the pipe flange. Even if frictional resistance occurs,
The tightening force is evenly transmitted to the plurality of continuous blocks through the tightening force transmitting means inserted through the insertion portion. Therefore, the blocks are evenly moved in the radial direction, and the pipe flanges are reliably joined to each other over substantially the entire outer peripheral portion. As a result, it is possible to surely prevent the fluid from leaking in and out from between the pipe flanges, and it is possible to use it stably even when the pressure in the pipe flange is high or the diameter is large.

Further, in the pipe flange clamp according to the present invention, a plurality of blocks each having a groove portion fitted to the outer peripheral portions of two pipe flanges are arranged in a circular shape, and a spacer is provided between the blocks. The fastening force transmission means is slidably inserted through an insertion portion formed between the spacer and the block, and one end portion of the fastening force transmission means is fixed to a predetermined block while the predetermined force is applied. The other end of the tightening force transmitting means is connected to a tightening means that is detachably engaged with the block (2).

According to the above-mentioned pipe flange clamp (2), the space between the blocks can be maintained by the spacer, and when the block is tightened by the tightening means, the groove portion and the pipe flange are secured. Even if frictional resistance in the tightening direction occurs between the fitting surfaces of the outer peripheral part and the outer peripheral part, the tightening force is evenly applied to each of the plurality of blocks through the tightening force transmitting means inserted in the inserting part. Will be transmitted to. Therefore, the blocks are evenly moved in the radial direction, and the pipe flanges are reliably coupled to each other at a predetermined position on the outer peripheral portion. As a result, it is possible to reliably prevent the fluid from leaking in and out from between the pipe flanges, and it is possible to use the fluid stably even when the degree of vacuum in the pipe flange is high or the diameter is large. Since part of the block is omitted, the manufacturing cost can be reduced as compared with the pipe flange clamp (1).

Further, in the pipe flange clamp according to the present invention, in the pipe flange clamp (1) or (2), the tightening force transmitting means is constituted by a belt member, and the insertion is formed in the outer peripheral portion of the block. Part is T
It is characterized by being formed by a groove (3).

According to the above-mentioned piping flange clamp (3), the belt member slides smoothly in the T-shaped groove, and the tightening force generated by the tightening means through the belt member. Can be reliably transmitted to a plurality of blocks. Moreover, since the block including the T-shaped groove and the like can be easily formed by machining, the manufacturing cost can be reduced.

Further, in the pipe flange clamp according to the present invention, in the pipe flange clamp (1) or (2), the tightening force transmitting means is composed of a wire, and the insertion portion formed in the block has a cross section. It is characterized by being constituted by a circular through hole (4).

According to the above-mentioned pipe flange clamp (4), the wire slides smoothly in the through hole, and the tightening force generated by the tightening means is applied through the wire. It can be reliably transmitted to the block.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a pipe flange clamp according to the present invention will be described below with reference to the drawings. Note that components having the same functions as those of the conventional example are denoted by the same reference numerals. 1A and 1B are schematic diagrams showing a pipe flange clamp according to Embodiment 1, where FIG. 1A is a front view and FIG. 1B is a sectional view taken along line AA in FIG. The flange 70 and the center ring 74 are configured similarly to those shown in FIG. 6, and a plurality of blocks 11 and one block 12 are continuously formed in a circular shape on the outer periphery of the flange 70 and the center ring 74. It is arranged. The blocks 11 and 12 are made of, for example, an aluminum-magnesium alloy in a fan shape in a front view, and the inner peripheral portions of the blocks 11 and 12 have groove portions 111 and 12 having a radius R ₄ .
1 are respectively formed, and the fitting surfaces 1 of the groove portions 111 and 121 are formed.
11a and 121a are set in the same tapered shape as the fitting surface 72a. Further, a T-shaped groove 112 as an insertion portion is formed in the outer peripheral portion of each block 11 along the circumferential direction,
A belt member 13 as a tightening force transmission means is slidably inserted into each T-shaped groove 112, and the belt member 1
3 is formed in a thin plate shape using, for example, stainless steel. A groove portion 122 is formed on the outer peripheral portion of the block 12, and a spherical seat 122a extends from the groove portion 122. One end of the belt member 13 is fixed to the upper surface of the groove 122 by using a screw 123 or the like, and the other end of the belt member 13 is attached to one end of the screw portion 141 by the caulking member 14.
It is connected using 2 etc. A knob 143 formed in a substantially columnar shape is screwed to the other end side of the screw portion 141, and the lower end of the knob 143 formed in a spherical shape is detachable in the spherical seat 122a of the block 12. Engaged. These screw portion 141, knob 143, spherical seat 122a
The tightening means 14 is configured to include the above. Then, when the outer peripheral portions 72 of the two flanges 70 with the center ring 74 interposed are inserted into the groove portions 111 and 121 and the blocks 11 and 12 are tightened using the tightening means 14, the lower surfaces of the blocks 11 and 12 are piped. It is set so as not to contact the outer peripheral surface of the connecting portion 71. Other configurations are shown in FIG.
Since it is similar to that shown in FIG. 7, a detailed description of its configuration will be omitted here. These blocks 1
The piping flange clamp 10 is configured to include the first and the second members 12, the belt member 13, the tightening means 14, and the like.

In the case of the block 11, using one machine tool, first, the outer and inner circumferences of a pipe material having a predetermined shape are turned to a predetermined size, and then a T-shaped groove 112 is formed on this outer peripheral portion, and After forming the groove portion 111 on the inner peripheral portion, the ring portion having a predetermined thickness is cut off. The blocks 11 are then easily manufactured by radially cutting the ring using another machine tool.

In the case of using the pipe flange clamp 10 having the above-described structure, the lower end of the knob 143 is first removed from the spherical seat 122a of the block 12, and the outer peripheral portion 72 is inserted into the groove portions 111 and 121. Meanwhile, the pipe flange clamp 10 is mounted around the flange 70. Next, after the lower end of the knob 143 is engaged with the spherical seat 122a, the knob 143 is rotated to tighten the screw portion 141, and the belt member 13 slides in the T-shaped groove 112 and is pulled in the circumferential direction. , The blocks 11 and 12 are pushed in in the radius (center) direction. Then, the fitting surfaces 111a and 121a of the groove portions 111 and 121 move in the radius (center) direction while contacting the fitting surface 72a, and as a result, the outer peripheral portions 72 are pressed and narrowed in the axial direction. When the flange surface 70a and the stepped portion 741a come into contact with each other, the O-ring 74b comes into close contact with the flange surface 70a, and the flanges 70 are joined together via the center ring 74.

As is apparent from the above description, in the pipe flange clamp 10 according to the first embodiment, when the blocks 11 and 12 are tightened using the tightening means 14, the groove parts 111 and 121 and the outer peripheral part 72 of the flange 70 are tightened. Even if frictional resistance occurs in the tightening direction between the mating surfaces 111a, 121a, 72a, the plurality of blocks 11 and 12 are connected to each other through the tightening force transmission means 13 inserted into the insertion portion 112. The tightening force is transmitted evenly. Therefore, the blocks 11 are evenly moved in the radial direction, and the flanges 70 are reliably coupled to each other on the substantially entire surface of the outer peripheral portion 72. As a result, it is possible to reliably prevent the fluid from leaking in and out from between the flanges 70, and it is possible to use it stably even when the pressure inside the flange 70 is high or the diameter thereof is large.

Further, the belt member 13 slides smoothly in the T-shaped groove 112, and the tightening means 1 is inserted through the belt member 13.
The tightening force generated by using 4
It can be surely transmitted to the first and the twelfth. Also T-shaped groove 1
Since the blocks 11 and 12 including 12 and the like can be easily formed by machining, the manufacturing cost can be reduced.

FIG. 2 is a schematic view showing a pipe flange clamp according to the second embodiment, wherein (a) is a partial front view,
(B) is a sectional view taken along line BB in (a). The blocks 11 are formed in the same manner as shown in FIG. 1, and spacers 21 each having a predetermined length are arranged between the blocks 11, and the ends of the spacers 21 and the end faces of the blocks 11 are in contact with each other. The spacer 21 is formed by bending a stainless thin plate, for example, and a T-shaped groove 21a as an insertion portion is formed in the upper portion of the spacer 21. A belt member 13 as a fastening force transmission means is inserted into the T-shaped groove 21a. There is. Since other configurations are similar to those shown in FIG. 1, detailed description of the configuration will be omitted here. The pipe flange clamp 20 is configured by including the spacer 21, the block 11, the belt member 13, and the like.

When the pipe flange clamp 20 constructed in this way is used, the lower end of the knob 143 is first removed from the spherical seat 122a of the block 12 as in the case shown in FIG. The piping flange clamp 20 is mounted around the flange 70 while inserting the outer peripheral portion 72 into the inside 121. Next, after the lower end of the knob 143 is engaged with the spherical seat 122a of the block 12, the knob 1
When 43 is rotated and the screw part 141 is tightened, the belt member 13 is pulled in the circumferential direction while sliding in the T-shaped grooves 112 and 21a, and the blocks 11 and 12 and the spacer 21 are moved in the radius (center) direction. Pushed in. Then the groove 11
The mating surfaces 111a and 121a of the Nos. 1 and 121 are the mating surfaces 72a.
While moving in the radial direction (center), the outer peripheral portions 72 are narrowed in the axial direction. When the flange surface 70a and the step portion 741a come into contact with each other, the flange surface 7
The O-ring 74b is brought into close contact with 0a, and the flanges 70 are joined together via the center ring 74.

As is apparent from the above description, in the pipe flange clamp 20 according to the second embodiment, the spacer 2 is used.
1, the distance between the blocks 11 can be maintained,
When the blocks 11 and 12 are tightened using the tightening means 14, the groove parts 111 and 121 and the outer peripheral part 7 of the flange 70.
Even if frictional resistance in the tightening direction occurs between the mating surfaces 111a, 121a, 72a with the insertion portions 112, 21a.
The tightening force is evenly transmitted to the plurality of blocks 11 and 12 through the tightening force transmitting means 13 which is inserted in the block.
Therefore, the blocks 11 and 12 are evenly moved in the radial direction, and the flanges 70 are reliably coupled to each other at a predetermined position on the outer peripheral portion 72. As a result, the flange 7
It is possible to reliably prevent the leakage and ingress of fluid between 0,
In particular, even when the degree of vacuum in the flange 70 is high or the diameter is large, it can be used stably. Further, since part of the block 11 is omitted, the manufacturing cost can be reduced as compared with the pipe flange clamp 10.

FIG. 3 is a schematic view showing a pipe flange clamp according to another embodiment, (a) is a partial front view, and (b) is a sectional view taken along the line CC in (a). The block 11 is formed similarly to that shown in FIG. 1, and spacers 31 each having a predetermined length are arranged between the blocks 11, and the end portions of the spacer 31 and the end surface of the block 11 are in contact with each other. The spacer 31 is formed in a generally arcuate shape when viewed from the front by, for example, a resin injection molding method.
A through hole 31a having a substantially rectangular shape in cross section as an insertion portion is formed in the inside of 1 in a substantially arc shape.
A belt member 13 as a tightening force transmission means is inserted through a. Since other configurations are similar to those shown in FIG. 2, detailed description of the configuration will be omitted here. The piping flange clamp 30 is configured to include the spacer 31, the block 11, the belt member 13, and the like.

In the case of using the piping flange clamp 30 having such a structure, since the through hole 31a of the spacer 31 is formed in a substantially arc shape, the belt member between the through hole 31a and the T-shaped groove 112 is formed. The movement of 13 can be made smooth.

In the above-described first and second embodiments and the other embodiments, the case where the belt member 13 is formed of stainless steel into a thin plate shape has been described. The surface may be coated with Teflon.

FIG. 4 is a schematic view showing a pipe flange clamp according to the third embodiment, in which (a) is a front view,
(B) is the DD sectional view taken on the line (a), and (c) is the EE sectional view taken on the (a). Block 41,
42 is formed in a substantially fan shape in a front view by an injection molding method of, for example, polyethylene resin or polypropylene resin, and the groove portions 11 having a radius R ₄ are formed on the inner peripheral portions of the blocks 41 and 42.
1 and 121 are formed respectively, and the fitting surfaces 111a and 121a of the groove portions 111 and 121 are set in the same tapered shape as the fitting surface 72a. Two through-holes 412 are formed inside the block 41 as insertion portions. The through-holes 412 are set to have a substantially arcuate shape in a front view, and the distance between the through-holes 412 is set to a distance d. Block 41
A spacer 44 having a predetermined length is arranged between them, and the end portion of the spacer 44 and the end surfaces of the blocks 41 and 42 are in contact with each other. The spacer 44 is formed in a generally arcuate shape in a front view by, for example, a resin injection molding method, and two through holes 44a as insertion portions are formed inside the spacer 44.
The through hole 44a is set to have a substantially arcuate shape in a front view, and
A distance d is set between the through holes 44a. A wire 43 as a tightening force transmitting means is inserted into the through holes 44a and 412.

5A and 5B are schematic views showing an example of a connecting means for connecting the tightening means and the wire. FIG. 5A is a front sectional view, and FIG. 5B is a sectional view taken along the line GG in FIG. FIG. 6C is a sectional view taken along line HH (side surface) in FIG. A flange portion 451 having a substantially rectangular parallelepiped plate shape is attached to one end of the screw portion 141 of the screw tightening means 14, and the flange portion 451 has a guide groove 452a having a substantially U shape in a plan view.
A guide portion 452 having a
The distance 52a is set to the distance d. Guide groove 452a
A substantially central portion of the wire 43 is inserted therein, and a cover 453 is attached on the guide portion 452 so as to cover the wire 43 and the like. These flange portions 45
The connection means 45 is configured to include 1, the guide portion 452, the cover 453, etc., and the wires 43 are distributed through the guide portion 452, so that the tightening force is always evenly distributed to each of the two wires 43. It is being distributed.

A spherical seat 422a with which the tightening means 14 is engaged is formed at a predetermined position on the outer peripheral portion of the block 42, while concave portions 423 are formed on both side surfaces of the block 42, and the wire 43 is formed in the concave portion 423. Both ends of are fixed by using fasteners 424, screws 424a, and the like. Since other configurations are similar to those shown in FIG. 1, detailed description of the configuration will be omitted here. A piping flange clamp 40 is configured by including these blocks 41, 42, wires 43, spacers 44, tightening means 14, and the like.

As is clear from the above description, in the pipe flange clamp 40 according to the third embodiment, the through hole 41 is provided.
The wire 43 is smoothly slid on the 2, 44a,
The tightening force generated by using the tightening means 14 can be reliably transmitted to the blocks 41 and 42 via the.

In the above-described third embodiment, the spacer 44 is interposed between the blocks 41 and 42, but in the other embodiment, the spacer 44 is interposed. It does not have to be dressed.

In each of the above-described first to third embodiments, the case where the two flanges 70 with the center ring 74 interposed are joined together has been described. A backup ring may be arranged on the outer circumference, and the flange 70 on one side may be a blind flange, a reducer, an elbow, or the like.

[Brief description of drawings]

FIG. 1 is a schematic view showing a first embodiment of a pipe flange clamp according to the present invention, in which (a) is a front view and (b) is a schematic view.
FIG. 7A is a sectional view taken along line AA in (a).

2A and 2B are schematic views showing a pipe flange clamp according to Embodiment 2, where FIG. 2A is a partial front view and FIG. 2B is a sectional view taken along line BB in FIG.

3A and 3B are schematic diagrams showing a pipe flange clamp according to another embodiment, wherein FIG. 3A is a partial front view and FIG. 3B is a sectional view taken along line CC in FIG. 3A.

4A and 4B are schematic diagrams showing a pipe flange clamp according to Embodiment 3, where FIG. 4A is a front view and FIG.
6 is a sectional view taken along line D-D in FIG.
It is E sectional drawing.

5A and 5B are schematic views showing an example of a connecting means for connecting the tightening means and the wire in the pipe flange clamp according to the third embodiment, wherein FIG. 5A is a front sectional view and FIG.
6A is a cross-sectional view taken along line GG (planar) in (a), and (c) is a cross-sectional view taken along line HH (side) in FIG.

FIG. 6 is a schematic view showing an NW type flange and a conventional clamp for piping flange of this kind, (a) is a front view,
(B) is a sectional view taken along line II in (a).

FIG. 7 is a schematic view showing a NW type flange and the like and another conventional pipe flange clamp, (a) is a front view,
(B) is a JJ line sectional view in (a).

[Explanation of symbols]

 10 Piping Flange Clamps 11, 12 Blocks 111, 121 Grooves 112 T-shaped Grooves 13 Belt Member 14 Tightening Means 70 Flange 72 Outer Perimeter

Claims (4)

[Claims] 1. A plurality of blocks, each of which has a groove portion that fits on the outer peripheral portions of two pipe flanges, are continuously arranged in a circular shape, and a tightening force transmitting means is provided on an insertion portion formed in the block. The fastening force transmitting means is slidably inserted and one end portion of the fastening force transmitting means is fixed to a predetermined block, while the other end portion of the fastening force transmitting means is connected to the fastening means detachably engaged with the predetermined block. Clamps for piping flanges that are connected. 2. A plurality of blocks each having a groove portion that fits on the outer peripheral portions of two pipe flanges are arranged in a circular shape, and a spacer is interposed between the blocks, and the spacer and the block. The tightening force transmission means is slidably inserted through the insertion portion formed in and, and one end portion of the tightening force transmission means is fixed to a predetermined block and detachably engaged with the predetermined block. A pipe flange clamp, wherein the other end of the tightening force transmitting means is connected to the tightening means. 3. The tightening force transmitting means is constituted by a belt member, and the insertion portion formed on the outer peripheral portion of the block is constituted by a T-shaped groove. Clamp for pipe flange. 4. The tightening force transmitting means is formed of a wire, and the insertion portion formed in the block is formed of a through hole having a circular cross section. Clamp for pipe flange.