JPH0942550A - Tube fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tube fitting used mainly to a drainage piping, and having a small connecting work amount and a small working load at the working site. SOLUTION: A tube fitting main body 1 having a pipe receiver 11 and a projection 12; a packing 2 having a tongue 21, a leg 22, an arm 23, and a trunk 24; a band 31 having flanges 31A and 31B to surround the side surface of the outer periphery of the arm 23 and the trunk 24 of the packing 2; a fastening band 3 which consists of bolt fasteners 32 provided opposing to both end of the band 31; and a bolt 4 screwed to a bolt fastener; are provided to this tube fitting, and after a pipe P to be connected is inserted to a pipe receiver, the bolt 4 is fastened to fasten the band 31 and contract it in the direction of inner diameter, and the packing arm 23 and the trunk 24 are pressure contacted, so as to seal the pipe P closely, and at the same time, the pipe is connected by grasping it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for connecting drainage pipes of building equipment.

[0002]

2. Description of the Related Art As a pipe joint that can be used for drainage pipes and the like, there is a pipe joint shown in FIG. 3 and disclosed in Japanese Utility Model Publication No. 6-18108. This has a joint receiving hole a1 into which the tip of a pipe P to be connected is inserted, a joint main body a having a flange a2 projecting on the outer periphery and axial bolt holes provided at 120 ° intervals, and a ring-shaped rubber packing. b, a ring-shaped collar c in which this rubber packing b is arranged so as to be attached to the joint body a, and a thread d1 for preventing axial movement of the pipe on the inner peripheral surface, and the slit portion It is formed so that it can be expanded, and tangential bolt holes d2 are provided at both ends that sandwich this slit, and axial bolt holes a3 are provided at 120 ° intervals for the push ring d and each bolt hole of the joint body. a3, three bolts e penetrating each axial bolt hole d3 of the push ring d, three nuts f screwed to the bolt e, and a tangential bolt hole d2 of the push ring d. It is a pipe joint having a bolt g and a nut screwed to the bolt g. To connect the pipes using this pipe joint, the push ring d, the collar c, and the rubber packing b are inserted into the pipe p, then the pipe p is inserted into the joint receiving port a1, and the axial bolt e is attached. It was to secure the sealing property by tightening, and to tighten the bolt g in the tangential direction to prevent the pipe from coming off.

[0003]

According to the above-mentioned conventional pipe joint, at the connection site, the push ring d and the like are inserted into the pipe P and incorporated in the joint body a, and the three axial bolts e and the tangential bolt g are provided. Therefore, it is necessary to tighten the four bolts, which results in a large amount of work at the connection site. Moreover, since this pipe joint is usually made of casting, it is heavy by itself, and when connecting work with a relatively large diameter (approximately 4 inches or more), a considerable amount of weight including pipes will be handled.
There has been a problem that the burden on the worker is enormous.
Therefore, it is an object of the present invention to provide a pipe joint that reduces the amount of connection work and the work load on site.

[0004]

According to the present invention, there is provided a joint main body having a pipe receiving portion into which a pipe to be connected is inserted, and a projection portion provided on an outer periphery thereof, and one end of the joint main body so as to sandwich the pipe receiving portion of the joint main body. None, one arm of which surrounds the outer periphery of the pipe receiving part, the other leg is housed in the pipe receiving part, has a tongue with which the tip of the connected pipe abuts, and the other end of the connected pipe. A packing formed of a body for sealing between the packing and the outer periphery of the packing, and a flange portion at one end engages with a side surface of the protrusion of the joint body, and a flange portion at the other end is a body of the packing. The pipe joint is composed of a band portion that engages with the end surface of the portion, and a fastening band that has fastening portions provided at opposite ends of the band portion in a tangential direction.

[0005]

The above-mentioned pipe joint is preassembled by the fastening band, with the packing mounted over the pipe receiving portion of the joint body and the outer periphery thereof. At this time, the tongue portion of the packing is mounted along the inner wall, the leg portion extends along the inner wall of the pipe receiving portion, and the arm portion is in close contact with the outer periphery of the pipe receiving portion up to the protruding portion. The fastening band surrounds the outer periphery of the packing including the body portion, and the fastening portion is tightened to some extent. However, in this temporarily tightened state, the inner diameter of the packing is still larger than the outer diameter of the pipe to be connected, and the pipe can be inserted smoothly. Further, since one flange of the fastening band is engaged with the inside of the protrusion of the main body, the packing and the fastening band do not fall off from the joint body.

Thereafter, at the connection site, when the pipe is inserted into the pipe receiving portion of the joint body and the opposite fastening portions are tightened, one fastening portion is tightened and the band contracts in the radial direction, so that the packing is also compressed. Then, the packing body strongly presses the outer circumference of the pipe to hermetically seal between them and hold the pipe. On the other hand, since the packing arm is also compressed in the same manner, it is strongly pressure-bonded to the outer circumference of the pipe receiving part to hermetically seal the space therebetween. Further, the tip of the tube is in contact with the tongue of the packing, and absorbs thermal expansion of the tube, and at the same time, the tongue, the leg and the packing body absorb vibrations and noises transmitted to the tube. As described above, the pipe and the pipe joint are connected so as to prevent axial movement of the pipe with a sealing property only by tightening the fastening band.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing the embodiments. 1 and 2 show an embodiment of the pipe joint of the present invention, FIG. 1 is a vertical sectional view of FIG. 2, and FIG. 2 is a side view. The joint body 1 is made of a cast product such as gray cast iron or black core malleable cast iron, and although only one end is shown in the figure, there are also cheese type and 90 ° elbow type. It has a pipe receiving portion 11 at its end, and a protrusion 12 on its outer periphery. The inside of the pipe receiving portion 11 accommodates a packing leg portion 22 which will be described later, and the tip of the pipe P to be connected is the packing tongue portion 21 on the inner side (left side in the drawing).
There is a back wall 13 that stops through.

A packing 2 is arranged on the joint body so as to sandwich the pipe receiving portion 11. The packing 2 is made of synthetic rubber and has a tongue portion 21, a leg portion 22, and an arm portion outside the leg portion 22 from the back side.
It consists of 23 and body 24. When the packing 2 is attached to the tube receiving portion, the tongue portion 21 has a shape that substantially follows the inner wall 13,
The leg portion 22 is dimensioned so as to be crimped to the inner wall side of the pipe receiving portion 11. At the same time, the arm portion 23 is also crimped to the outer wall side of the tube receiving portion 11. On the other hand, the packing body 24 has an inner diameter slightly larger than the outer diameter of the pipe P so that the pipe P can be smoothly inserted. Further, the packing inlet surface is chamfered 25, and the surface to be pressure-bonded to the outer surface of the tube later has the uneven surface 26 to enhance the sealing effect. Further, an annular recess 27 is provided in the middle portion of the outer diameter portion of the packing 2 in the pipe axis direction to enhance the sealing effect between the packing arm portion 23 and the body portion 24.

A band 31 surrounds the outer peripheries of the arm portion 23 and the body portion 24 of the packing. The band member is preferably made of steel such as ordinary steel or stainless steel, and has flange portions 31A and 31B at both ends. The flange portion 31A side is wrapped around the outside surface of the packing body portion 24, and the flange portion 31B side is wrapped around the inside surface of the protrusion 12 of the pipe receiving portion. Both ends of the band 31 are overlapped with each other, and bolt fastening portions are provided at the band end portions of this portion so as to face each other in the tangential direction. That is, a female screw is attached to one end of the band 31.
One of the fastening portions 32B having 33 is provided, and the other end of the band 31 is provided with the other 32A of the fastening portions having the through hole 34 so as to face each other and are welded. Incidentally, the attachment may be performed not by welding means but by integral molding by plastic deformation. Next, the bolts 4 are attached to the bolt fastening portions, and in this example, two bolts 4 are provided in parallel with each other. By screwing the bolt 4 and the female screw 33, the fastening portion 32B side is fastened to the fastening portion 32A.
The band 31 is pulled up to the side, and as a result, the band 31 is tightened to be contracted in the radial direction.

The construction of the above pipe joint will be described below. First, in the factory, the packing 2 is attached to the joint body 1 in advance, the outer periphery of the packing 2 is surrounded by the band member 31, and the bolts 4 are lightly tightened to perform temporary assembly. In this state, the packing 2 has an inner diameter slightly larger than the outer diameter of the pipe P to be connected, so that the pipe can be smoothly inserted. Then, at the connection site, the pipe P is inserted into the pipe receiving portion 11 so that the tip of the pipe comes into contact with the packing tongue portion 21,
When the bolt 4 of the bolt fastening portion is tightened, the fastening portion on the female screw side is tightened, the band 31 contracts in the radial direction, and the arm portion 23 and the body portion 24 of the packing are compressed. Therefore, the packing body portion 24 swells toward the inner diameter side to press and seal the outer periphery of the pipe P and hold the pipe. Further, since the packing arm portion 23 also bulges toward the inner diameter side, the outer wall side of the pipe receiving portion 11 can be pressure-bonded and sealed. As described above, the pipe is easy to insert, and since it is connected with a sealing property by simply tightening two bolts, the amount of work and work load at the site are greatly reduced.

[0011]

According to the present invention, the pipe joint can be preliminarily assembled at the factory in advance, and in this state, the packing and the fastening band do not fall off from the main body, and the insertion resistance of the pipe is small and the pipe can be smoothly inserted. it can. At the connection site, the band can be contracted by simply tightening the bolts to connect the pipe and the pipe joint with a sealing property and a pullout preventing force. Therefore, the amount of connection work and connection burden at the site were greatly reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a pipe joint showing an embodiment of the present invention.

FIG. 2 is a side view of the pipe joint of FIG.

FIG. 3 is a partial vertical cross-sectional view showing an example of a conventional drainage pipe joint.

[Explanation of symbols]

1 ... Fitting body 2 ... Packing
3 ... Fastening band 4 ... Bolt 11 ... Pipe receiving part
12 ... Projection 13 ... Back wall 14 ... Pipe receiving part outer wall 21 ... Packing tongue 22 ... Packing leg
23 ... Packing arm 24 ... Packing body 31 ... Band 32 ... Bolt fastening part
33 ... Female thread 34 ... Through hole 31A, 31B ... Flange

Claims (1)

[Claims] 1. A pipe receiving portion into which a pipe to be connected is inserted,
A joint body having a protrusion on its outer periphery, one end of which is arranged so as to sandwich the pipe receiving portion of the joint body, one arm of which surrounds the outer periphery of the pipe receiving portion, and the other leg is housed in the pipe receiving portion. And a packing having a tongue portion with which the tip of the connected pipe abuts, and the other end having a body portion that seals between the connected pipe, and a flange portion of one end that surrounds the outer periphery of the packing. And a band portion that engages with the side surface of the protrusion of the joint body, and the flange portion at the other end engages with the end surface of the body portion of the packing,
A pipe joint, comprising: a fastening band having fastening portions provided at both ends of the band portion so as to face each other in a tangential direction.