KR102392302B1 - Apparatus for connecting pipes - Google Patents

Abstract

A pipe joint device according to an embodiment of the present invention, has at least one end, the joint pipe is inserted into the connecting pipe to the end; and a pipe fixing member coupled to an end of the fitting pipe to fix the connector inside the fitting pipe, wherein the pipe fixing member includes a sealing fitted inside the fitting pipe, and disposed in front of the sealing A second pressure ring to be formed, a stopper disposed in front of the second pressure ring, a first pressure ring disposed in front of the stopper, and a clamp unit surrounding an end of the joint pipe and a portion of the first pressure ring Including, an outer surface of the stopper and an inner surface of the second pressure ring are in surface contact with each other, and the outer surface of the stopper and the inner surface of the second pressure ring are directed toward the sealing from the first pressure ring. It is characterized in that it is formed to be inclined in a direction in which the diameter decreases.

Description

pipe fittings {Apparatus for connecting pipes}

The present invention relates to a pipe fitting device.

In general, in order to connect a plurality of pipes installed in water and sewage, firefighting, gas, electricity, and various industrial plants to each other, ends of pipes to be connected are buttted to each other, or a separate joint device is used.

In the prior art below, it is disclosed that a clamp member is applied to connect two tubes.

In detail, the clamp member is surrounded by the outer peripheral surfaces of the two pipes in contact with each other, in a state in which a plurality of clamps are connected by fastening bolts. Then, a tightening force retaining nut is fitted to an end of the fastening bolt to tighten the fastening bolt.

Then, when the diameter of the clamp is reduced by tightening the fastening bolt, a radial force is applied to the upper surface of the pressure contact ring while the diameter of the clamp is reduced. At this time, since the upper surface of the pressure contact ring in contact with the inner surface of the clamp is inclined, the radial force acting during the clamping process is divided into a radial force vector and an axial force vector and acts on the upper surface of the pressure contact ring do.

Then, the elastic ring is pressed in the axial direction of the joint pipe by the axial force vector acting on the pressure contact ring, and the shape is distorted. As a result, the inner surface of the elastic ring is more closely attached to the outer circumferential surface of the fitting, and separation of the fitting is prevented.

In the case of a joint pipe device having such a structure, the elastic ring is deformed in shape only by a force acting in the axial direction, and the adhesion between the elastic ring and the joint pipe increases, so the pipe connection performance is poor.

In addition, since the magnitude of the axial force acting on the elastic ring is smaller than the magnitude of the radial force acting on the clamp, the force required to tighten the clamp must be large, and thus work efficiency is lowered.

Korean Patent Registration No. 10-1678379 (November 16, 2016)

The present invention is proposed to improve the above problems.

A pipe joint device according to an embodiment of the present invention for achieving the above object, a joint pipe having at least one end, a connecting pipe is inserted into the end; and a pipe fixing member coupled to an end of the fitting pipe to fix the connector inside the fitting pipe, wherein the pipe fixing member includes a sealing fitted inside the fitting pipe, and disposed in front of the sealing a second pressure ring, a stopper disposed in front of the second pressure ring, a first pressure ring disposed in front of the stopper, and a clamp unit surrounding an end of the joint pipe and a portion of the first pressure ring Including, an outer surface of the stopper and an inner surface of the second pressure ring are in surface contact with each other, and the outer surface of the stopper and the inner surface of the second pressure ring are directed toward the sealing from the first pressure ring. It is formed to be inclined in a direction in which the diameter decreases, and the joint pipe includes a cylindrical joint, a tube seat extending from the front end of the joint, and a tube fixing part that expands and extends from the front end of the tube seat, and , The inner circumferential surface of the tube fixing portion includes a second cylindrical portion extending in a cylindrical shape from the front end of the inclined portion and an inclined portion inclined in a direction in which the diameter increases from the front end of the inner circumferential surface of the tube seating portion, and the front end of the second cylindrical portion Including a stepped portion extending in the radial direction, and a first cylindrical portion extending in a cylindrical shape from an end of the stepped portion, the outer diameter of the second pressing ring is formed to have a size corresponding to the inner diameter of the first cylindrical portion, the It is characterized in that by the axial force vector Fa acting on the second pressing ring and acting in a direction parallel to the central axis of the joint pipe, the second pressing ring can move in the axial direction until it is caught on the stepped portion. do it with

The stopper may include a C-ring having both ends spaced apart from each other and having an elastic force.

One or a plurality of tightening protrusions may protrude from the inner circumferential surface of the stopper.

The first pressing ring includes a ring body inserted into the fitting pipe, and a ring head extending in a radial direction from the front end of the ring body, and is inclined in a shape of decreasing diameter toward the front end of the ring head. An inclined surface may be formed on the front surface of the ring head.

The outer peripheral surface of the sealing may include a cylindrical portion and an inclined portion extending from the rear end of the cylindrical portion.

The inclined portion may be formed to be inclined in a direction in which a diameter decreases from the front end to the rear end of the sealing.

One or a plurality of tightening projections may protrude from the inner circumferential surface of the sealing.

A flange may extend outwardly in a radial direction of the joint pipe at an end of the joint pipe, and the clamp unit may be formed to surround the flange and the ring head.

The clamp unit may include a first clamp; a second clamp having one end rotatably connected to one end of the first clamp; a third clamp having one end connected to the other end of the second clamp; a connection clamp connecting the other end of the first clamp and the other end of the third clamp; and a fastening member integrally coupling the other end of the third clamp, the connecting clamp, and the other end of the first clamp.

The fastening member may include a fastening bolt sequentially passing through the other end of the third clamp, the connecting clamp, and the other end of the first clamp, a washer fitted to an outer circumferential surface of the fastening bolt, and the first clamp It may include a fastening nut fitted to the outer peripheral surface of the fastening bolt passing through the other end of the.

According to the pipe joint device according to an embodiment of the present invention having the configuration as described above, the inner surface of the clamp forms a wide inclined surface contact with the first pressing ring. Therefore, as the diameter of the clamp is reduced by tightening the clamp, it is possible to press the first pressing ring in the radial and axial directions with sufficient magnitude of force and displacement.

In addition, since the stopper and the second pressure ring are coupled in a inclined surface contact, the axial force transmitted by the first pressure ring presses the stopper in the axial direction, and the stopper is again tightened by the second pressure ring, It is possible to maintain a state in which the pipe to be connected is stably coupled to the pipe joint device.

In addition, since the fastening force of the stopper is relatively large compared to the conventional pipe joint device, the internal pressure to withstand the pressure in the pipe in the state in which the pipe to be connected is fastened is advantageous compared to the conventional case.

1 is a perspective view of a pipe joint device according to an embodiment of the present invention.
Figure 2 is an exploded perspective view of the pipe joint device.
Fig. 3 is a side cross-sectional view of the pipe joint device taken along line 3-3 of Fig. 1;
Figure 4 is a front cross-sectional view of the pipe joint device taken along 4-4 of Figure 3;
Figure 5 is a front perspective view of the first pressing ring constituting the tube fixing member according to the embodiment of the present invention.
6 is a rear perspective view of the first pressing ring;
7 is a front perspective view of a stopper constituting a tube fixing member according to an embodiment of the present invention.
Figure 8 is a front perspective view of the second pressing ring constituting the tube fixing member according to the embodiment of the present invention.
9 is a front perspective view of a sealing constituting a tube fixing member according to an embodiment of the present invention.
10 is a rear perspective view of a fitting constituting the pipe fitting device of the present invention.
FIG. 11 is a side cross-sectional view of a fitting taken along line 11-11 of FIG. 10;
12 is a cross-sectional view of a pipe joint device showing a state before flange tightening after inserting a connecting pipe.
13 is a cross-sectional view of the pipe joint device showing the state after the flange tightening is completed.

Hereinafter, a pipe joint device according to an embodiment of the present invention will be described in detail with reference to the drawings.

1 is a perspective view of a pipe joint device according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the pipe joint device, and FIG. 3 is a side cross-sectional view of the pipe joint device cut along 3-3 of FIG. 4 is a front cross-sectional view of the pipe joint device cut along 4-4 of FIG.

For reference, it should be noted that the drawings of the pipe joint device disclosed in FIGS. 1 to 4 are views showing only one end portion of the pipe joint device. That is, the pipe joint structure of the same type is also provided at the other end of the joint pipe.

1 to 4 , the pipe fitting device 10 according to an embodiment of the present invention includes a fitting pipe 11 and a pipe fixing member inserted into the fitting pipe 11 .

The joint pipe 11 may be formed in a straight shape, an L shape, or a T shape, and the pipe fixing member is provided at the ends of the joint pipe 11 in the same way. In addition, the ends into which the tube fixing member is inserted may be designed to have the same shape.

Here, a structure in which the end into which the connecting pipe is inserted is formed only at one end of the joint pipe 11 is also possible. For example, a structure in which one end of the joint pipe is formed as one body with the first connecting pipe, and a pipe joint structure is formed only at the other end of the joint pipe is also possible.

Hereinafter, the pipe fixing member inserted into one end of the joint pipe 11 and its function will be described, and redundant description of the pipe fixing member inserted into the other end and its function will be omitted.

The tube fixing member may include a clamp unit 12 .

In detail, the clamp unit 12 may be formed in a form in which a plurality of clamp pieces are rotatably connected to each other. For example, the clamp unit 12 may include a first clamp 121 , a second clamp 122 , a third clamp 123 , and a connection clamp 124 .

One end of the first clamp 121 and the third clamp 123 may be rotatably connected to the left end and the right end of the second clamp 122 by a hinge 125 , respectively. In addition, the first to third clamps 121 to 123 may have a shape surrounding the outer circumferential surface of the joint pipe 11 .

The connection clamp 124 may include an overlapping portion 124a and a connection rib 124b protruding from an outer circumferential surface of the overlapping portion 124a.

A stepped portion or a recessed portion for accommodating the overlapping portion 124a is formed on the inner surface of the other end of the first clamp 121 and the inner surface of the other end of the third clamp 123 . In addition, the other end of the first clamp 121 and the other end of the third clamp 123 are in close contact with the left side and the right side of the connection rab 124b, respectively.

In addition, fastening holes 121a , 123a , and 124c may be respectively formed at the other end of the first clamp 121 , the other end of the third clamp 123 , and the connection rib 124b. And, when the clamp unit 12 is coupled to the outer circumferential surface of the joint pipe 11 , the centers of the fastening holes 121a , 123a , and 124c are aligned so that the fastening bolt 17 can be inserted.

In detail, a washer 18 may be fitted to the fastening bolt 17 , and the fastening bolt 17 passes through the fastening holes 121a , 123a and 124c in a state where the washer 18 is fitted. A fastening nut 19 is fitted to an end of the fastening bolt 17 passing through the fastening holes 121a, 123a, and 124c.

When the fastening bolt 17 is rotated using a driver or the like, the length of the fastening bolt 17 passing through the fastening nut 19 is increased, and the other end of the first clamp 121 and the third clamp ( As the other end of the 123 is gradually closer to the connecting rib 124b of the connecting clamp 124, the diameter of the clamp unit 12 is reduced.

Here, the clamp unit 12 included in the scope of the present invention includes a structure consisting of two pieces of clamps symmetrical to each other, or a structure consisting of a single circular clamp, in addition to the structure consisting of a three-piece clamp as shown. make it clear that you can

In detail, the structure consisting of two pieces of clamps symmetrical to each other includes a first clamp and a second clamp having symmetrical shapes, and one end of the first clamp and one end of the second clamp are rotatably connected by a hinge. It can be understood as a structure in which the other end of the first clamp and the other end of the second clamp are connected by a fastening bolt.

In addition, the structure consisting of a single clamp may be understood as a structure in which one end and the other end of the substantially circular member are connected by a fastening bolt.

Meanwhile, the tube fixing member may further include a first pressing ring 13 . The first pressing ring 13 may be made of an elastically deformable material, and may be assembled to be seated at an end of the joint pipe 11 . The clamp unit 12 applies a pressing force in the axial direction and the radial direction of the first pressing ring (or the fitting pipe) 13 in a state in which the first pressing ring 13 is wrapped.

The tube fixing member may further include a stopper 14 placed at the rear of the first pressing ring 13 .

Here, the direction from the end of the joint pipe 11 toward the center of the joint pipe 11 is defined as rear, and the opposite direction is defined as the front. Accordingly, the stopper 14 may be defined as being placed behind the first pressing ring 13 .

Meanwhile, the tube fixing member may further include a second pressing ring 15 placed at the rear of the stopper 14 . The second pressing ring 15 functions to press the stopper 14 radially inward of the fitting pipe 11 when the clamp unit 12 is tightened.

The tube fixing member may further include a sealing ring (16) placed on the rear of the second pressing ring (15). The sealing 16 functions to prevent the fluid flowing along the fitting pipe 11 from leaking into a gap between the fitting pipe 11 and the connecting pipe. Furthermore, the sealing 16 may be described as strongly adhering to the outer circumferential surface of the connection pipe, and also partially performing a function of preventing the connection pipe from being separated from the joint pipe 11 .

Hereinafter, each of the components constituting the fitting pipe 11 and the pipe fixing member constituting the pipe fitting device 10 according to the present invention will be described in more detail with reference to the drawings.

Figure 5 is a front perspective view of the first pressure ring constituting the tube fixing member according to the embodiment of the present invention, Figure 6 is a rear perspective view of the first pressure ring.

5 and 6 , a through hole 134 through which a connection pipe passes is formed inside the first pressing ring 13 according to an embodiment of the present invention.

In detail, the first pressing ring 13 may include a cylindrical ring body 131 and a ring head 132 formed at the front end of the ring body 131 .

In addition, the front surface of the ring head 132 is formed with an inclined surface 133 inclined to the rear of the first pressing ring 13 from the inner edge to the outer edge. That is, the surface or a straight line passing through the front end of the ring head 132 may be inclined at a predetermined angle toward the rear end of the ring head 132 .

The rear surface of the ring head 132 is seated on the end of the fitting pipe 11 , and the ring body 131 is inserted into the fitting pipe 11 . And, when the clamp unit 12 is clamped, a radial urging force generated by the clamp unit 12 acts on the inclined surface 133 of the ring head 132 .

In addition, the force acting perpendicular to the inclined surface 133 is divided into a radial force vector and an axial force vector of the first pressing ring 13 . And, by the radial force vector of the first pressing ring 13, the first pressing ring 13 can be pressed into close contact with the outer circumferential surface of the connection pipe, and the stopper 14 is moved by the axial force vector It is pressed in the axial direction of the fitting pipe (11).

7 is a front perspective view of a stopper constituting a tube fixing member according to an embodiment of the present invention.

Referring to FIG. 7 , the stopper 14 according to the embodiment of the present invention has a C-ring shape in which both ends 141 and 142 are spaced apart, and when the clamp 12 is tightened, both ends of the stopper 14 ( 141,142) are reduced in diameter until they come into contact.

In detail, the stopper 14 may be made of a metal material, and the outer circumferential surface may form an inclined surface 144 . The inclined surface 144 may be inclined in a direction in which the outer diameter of the stopper 14 decreases from the front end to the rear end of the stopper 14 .

In addition, one or a plurality of tightening protrusions 143 may be protruded from the inner circumferential surface of the stopper 14 . The tightening protrusion 143 may be surrounded in the circumferential direction of the stopper 14 and may have a triangular cross-sectional shape with a sharp tip.

The tightening protrusion 143 may protrude obliquely in a form in which an inner diameter decreases from the front end to the rear end of the stopper 14 . Then, the connection pipe does not act as a resistance in the process of being inserted into the fitting pipe 11, but when a force is applied to the coupling pipe in a direction to separate the coupling pipe from the fitting pipe 11, the tightening protrusion 143 ) acts as a resistance that prevents the separation of the connecting tube.

8 is a front perspective view of a second pressing ring constituting a tube fixing member according to an embodiment of the present invention.

Referring to FIG. 8 , the second pressing ring 15 according to the embodiment of the present invention has a cylindrical shape so that a through hole 152 is formed therein. And, the second pressing ring 15 is placed on the rear of the stopper (14). And, when the clamp 12 is tightened, an axial pressing force from the stopper 14 acts on the second pressing ring 15 .

In detail, an inclined surface 151 is formed on the inner peripheral surface of the second pressing ring 15, and the inclined surface 151 is inclined in a direction in which the inner diameter decreases from the front end to the rear end of the second pressing ring 15. . That is, the inclined surface 151 of the second pressing ring 15 and the inclined surface 144 of the stopper 14 are inclined at the same or similar inclination angle, so that they can be in close contact with each other.

9 is a front perspective view of a sealing constituting a tube fixing member according to an embodiment of the present invention.

Referring to FIG. 9 , the sealing 16 according to the embodiment of the present invention may have a cylindrical shape having a through hole 161 formed therein.

The sealing 16 may be made of a rubber or silicone material having elasticity, and one or a plurality of tightening protrusions 164 may be formed on the inner circumferential surface 163 . The fastening protrusion 164 has the same shape as the fastening protrusion 143 formed on the inner circumferential surface of the stopper 14 and performs the same function.

In addition, the outer peripheral surface 162 of the sealing 16 may be formed of a cylindrical portion 162a and an inclined portion 162b. The inclined portion 163b may be formed from the rear end of the cylindrical portion 162a to the rear end of the sealing 16 , and may be inclined in a direction in which the outer diameter decreases toward the rear end of the sealing 16 .

10 is a rear perspective view of a fitting constituting the pipe fitting device of the present invention, and FIG. 11 is a side cross-sectional view of the fitting pipe cut along 11-11 of FIG. 10 .

10 and 11, the pipe fixing member is inserted into the inside of one end of the joint pipe 11 according to the embodiment of the present invention.

In detail, the joint pipe 11 includes a cylindrical joint 111, a pipe seat 112 extending from the front end of the joint 111, and an expansion and It may include a tube fixing portion 113 that extends.

The outer diameter of the tube seating portion 112 may be formed to be larger than the outer diameter of the joint portion 111 , and the tube seating jaw 112a on which the end of the connecting pipe is seated is provided on the inner surface of the tube seating portion 112 . can be formed. The tube seating protrusion 112a may be formed by designing an inner diameter of the joint portion 111 to be smaller than an inner diameter of the tube seating portion 112 .

The inner circumferential surface of the tube fixing part 113 includes an inclined portion 113d (or expanded tube portion) that is inclined in a direction in which the diameter increases from the front end of the inner peripheral surface of the tube seating portion 112, and the front end of the inclined portion 113d. may include a second cylindrical portion 113c extending in a cylindrical shape, and a first cylindrical portion 113a extending from a front end of the second cylindrical portion 113c.

The diameter of the first cylindrical part 113a is designed to be larger than the diameter of the second cylindrical part 113c, and the stepped part 113b is formed at the point where the first cylindrical part 113a and the second cylindrical part 113c meet. ) can be formed.

In addition, a flange 114 may extend to one end of the joint pipe 11 , specifically, a front end of the pipe fixing part 113 . That is, the flange 114 may be understood as a portion protruding radially outward from the end of the joint pipe 11 .

12 is a cross-sectional view of a pipe joint device showing a state before flange tightening after inserting a connecting pipe, and FIG. 13 is a cross-sectional view of a pipe joint device showing a state after flange tightening is completed.

First, referring to FIG. 12 , a sealing 16, a second pressure ring, a stopper 14 and a first pressure ring are fitted to the tube fixing part 113 of the joint pipe 11, and the clamp unit 12 In this loosely loosened state, the connecting pipe 20 is inserted into the fitting pipe 11 .

In this state, the fastening bolt 17 penetrates the ends of the first clamp 121 and the third clamp 123 and is only inserted into the fastening nut 19. Therefore, the clamping paper unit 12 This can be seen as loosely unwound.

And, the clamp unit 12 surrounds the flange 114 of the joint pipe 11 and the ring head 132 of the first pressure ring 13, and the flange 114 is the clamp unit 12 It remains hung at the rear end of the

Also, the inclined surface 133 of the ring head 132 is in close contact with the inner surface of the clamp unit 12 . In detail, the clamp unit 12 is bent in an approximately n-shape, so that the rear bent portion is caught on the flange 114 , and the inner surface of the front bent portion is inclined to be in close contact with the ring head 132 .

Referring to FIG. 13 , when the clamp unit 12 is gradually tightened by rotating the fastening bolt 17 , the inner diameter of the clamp unit 12 is gradually reduced and approaches the outer circumferential surface of the connection pipe 20 . .

And, as the diameter of the clamp unit 12 decreases, the pressing force F acts on the ring head 132 in a direction perpendicular to the inclined surface 133 . Of course, a pressing force may also act radially inward from the edge of the ring head 132 .

In detail, the axial force vector of the pressing force F acting on the inclined surface 133 of the ring head 132 acts as a force pushing the stopper 14 in the axial direction.

In addition, the radial force vector of the pressing force F acting on the inclined surface 133 of the ring head 132 and the pressing force acting in the radial direction from the edge of the ring head 132 may cause the stopper 14 to be an axis. After pushing in the direction, the inner peripheral surface of the first pressing ring 13 is strongly attached to the connecting pipe 20 .

On the other hand, the axial force vector acting on the stopper 14 acts on the inclined surface 151 of the second pressing ring 15, first in the axial direction, so that the rear end face of the second pressing ring 15 is The second pressing ring 15 is pushed until it touches the stepped portion 113b of the tube fixing portion 113 . And, when the stopper 14 is further pushed in the axial direction in a state in which the second pressing ring 15 is in contact with the stepped portion 113b and is no longer pushed, the stopper 14 is radially inner by the inclined surface of the stopper 14 . , that is, it is dispersed by the force of adhering to the connecting pipe 20 .

Due to the dispersion of this force, the inner peripheral surface of the stopper 14 strongly adheres to the connecting pipe 20 , and at the same time, the second pressing ring 15 pushes the sealing ring 16 in the axial direction.

In the sealing 16 , the inclined portion 162b of the sealing 16 moves along the inclined portion 113d of the joint pipe 11 by the axial pressing force transmitted from the second pressing ring 15 . it becomes Accordingly, the cross-sectional shape of the sealing 16 is deformed in a direction in which the axial cross-sectional length of the sealing 16 decreases while the radial cross-sectional length increases. As a result, the inner circumferential surface of the sealing 16 strongly adheres to the outer circumferential surface of the connecting pipe 20 .

In this way, the stopper 14 and the second pressing ring 15 are in inclined surface contact, so that the stopper 14 is strongly in close contact with the connecting pipe 20, and the connecting pipe 20 and the pipe joint device ( 10) can be stably maintained.

Claims (12)

a joint pipe having at least one end and a connecting pipe inserted into the end; and
It is coupled to the end of the joint pipe, comprising a pipe fixing member for fixing the connecting pipe to the inside of the joint pipe,
The tube fixing member,
a sealing fitted inside the joint pipe;
a second pressure ring disposed in front of the sealing;
a stopper disposed in front of the second pressing ring;
a first pressing ring disposed in front of the stopper;
and a clamp unit surrounding an end of the joint pipe and a portion of the first pressure ring,
The outer surface of the stopper and the inner surface of the second pressing ring are in surface contact with each other,
The outer surface of the stopper and the inner surface of the second pressure ring are formed to be inclined in a direction in which a diameter decreases from the first pressure ring toward the sealing,
The joint is
A cylindrical joint, and
A tube seating portion extending from the front end of the joint portion,
Including a pipe fixing part that expands and extends from the front end of the pipe seating part,
The inner peripheral surface of the tube fixing part,
an inclined portion inclined in a direction in which the diameter increases at the front end of the inner peripheral surface of the tube seating portion;
a second cylindrical portion extending in a cylindrical shape from the front end of the inclined portion;
a stepped portion extending in a radial direction from the front end of the second cylindrical portion;
Including a first cylindrical portion extending in a cylindrical shape from the end of the stepped portion,
The outer diameter of the second pressing ring is formed to have a size corresponding to the inner diameter of the first cylindrical portion,
By means of an axial force vector (Fa) acting on the second pressing ring but acting in a direction parallel to the central axis of the joint pipe, the second pressing ring is movable in the axial direction until it is caught on the stepped portion. Characterized pipe joint. The method of claim 1,
Both ends of the stopper are spaced apart, and the pipe joint device includes a C-ring shape. 3. The method of claim 2,
A pipe joint device, characterized in that one or a plurality of tightening projections protrude from the inner circumferential surface of the stopper. The method of claim 1,
The first pressure ring,
a ring body inserted into the fitting pipe;
and a ring head extending radially from the front end of the ring body;
A pipe joint device, characterized in that the inclined surface is formed on the front surface of the ring head in a form that the diameter decreases toward the front end of the ring head. The method of claim 1,
The outer peripheral surface of the sealing is,
cylindrical part,
A pipe joint device including an inclined portion extending from the rear end of the cylindrical portion. 6. The method of claim 5,
The inclined portion is a pipe joint device, characterized in that incline in a direction in which the diameter decreases from the front end to the rear end of the sealing. 6. The method of claim 5,
A pipe joint device, characterized in that one or a plurality of tightening projections protrude from the inner circumferential surface of the sealing. 5. The method of claim 4,
At the end of the fitting, a flange extends outward in the radial direction of the fitting,
The clamp unit is a pipe joint device, characterized in that surrounding the flange and the ring head. 9. The method of claim 8,
The clamp unit,
first clamp;
a second clamp having one end rotatably connected to one end of the first clamp;
a third clamp having one end connected to the other end of the second clamp;
a connection clamp connecting the other end of the first clamp and the other end of the third clamp; and
and a fastening member integrally coupling the other end of the third clamp, the connecting clamp, and the other end of the first clamp. 10. The method of claim 9,
The fastening member is
a fastening bolt sequentially passing through the other end of the third clamp, the connecting clamp, and the other end of the first clamp;
a washer fitted to the outer circumferential surface of the fastening bolt;
A pipe joint device including a fastening nut fitted to an outer circumferential surface of the fastening bolt that has passed through the other end of the first clamp. delete delete

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