JPH0681984A - Tube joint - Google Patents

Abstract

PURPOSE:To improve an anti-slip effect of pipe through simple and reliable holding of the pipe and perform excellent mutualconnection of a pipe and a tube joint with sealing ability only by fastening the grip ring of a joint body by means of a grip bolt and a nut. CONSTITUTION:The flange 2a of a packing 2 is nipped between a pipe and a joint body 1 by means of a packing press 3. A bolt 5 is inserted through the bolt hole 1d of the joint body 1 and joined in a screwed-in state with the female screw 3a of the packing press 3 and inserted through a plurality of bolt holes 4b and 4c formed axially of a grip ring 4 and a nut 5a is joined in a screwed-in state with the protruding end part of the bolt. Further, a grip bolt 6 is inserted through a bolt hole 4e extending in the tangential direction of the grip ring 4, and a nut 6a is joined in a screwed-in state with the protruding end part of the grip bolt. As noted above, a pipe can be simply and reliably grasped only by fastening the grip ring 4 by means of the grip bolt 6 and the nut 6a.

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 usable for drainage pipes, there is one disclosed in Japanese Utility Model Laid-Open No. 63-139390. This has a joint receiving hole into which a tip of a pipe to be connected is inserted, a joint main body in which flanges are projected on the outer periphery and axial bolt holes are provided at 120 ° intervals, a ring-shaped rubber packing, and the rubber. A ring-shaped collar arranged so as to sandwich the packing with the joint body and a thread on the inner peripheral surface for preventing axial movement of the pipe are formed so as to be expandable by the slit portion, Bolt holes in the tangential direction are provided at both ends sandwiching the slit, and a push ring with axial bolt holes provided at 120 ° intervals and each bolt hole in the joint body are passed through to make each bolt hole in the axial direction of the push ring. This is a pipe joint having three bolts that penetrate therethrough, three nuts that screw into the bolts, bolts that penetrate through bolt holes in the tangential direction of the push ring, and nuts that screw into the bolts. To connect pipes using this pipe joint, after inserting the push ring, collar and rubber packing into the pipe, insert the pipe into the joint receiving port and tighten the axial bolts to secure the sealing performance. It is disclosed that a tangential bolt is tightened to prevent the tube from coming off.

[0003]

According to the above-mentioned prior art, since the tangential bolts are tightened after the axial bolts are tightened, when the tangential bolts tighten the push ring, the tangential bolt thrust is applied. There was a problem that it could not work effectively as a force for sandwiching the slit portion of the push ring, and the action of retaining the pipe was not sufficient. Also, at the connection site, it is necessary to insert a push ring, etc. into the pipe and assemble it into the joint body, and tighten the four bolts due to the three axial bolts and the tangential bolts. There is a problem that there are many. Therefore, it is an object of the present invention to provide a pipe joint which has a sufficient function of preventing the pipe from coming off and has a small amount of connection work on site.

[0004]

DISCLOSURE OF THE INVENTION The present invention is a joint having a pipe receiving portion into which a tip of a pipe to be connected is inserted, and a flange protruding on the outer periphery to form bolt holes in the pipe axial direction at a plurality of positions. A packing having a main body and a flange on the outer circumference, the inner diameter of which is smaller than the outer diameter of the pipe, and the flange of the packing are arranged so as to be sandwiched between the joint main body and a female screw in the pipe axial direction. Having a packing retainer engraved at a plurality of locations and a locking portion for preventing axial movement of the pipe on the inner peripheral surface,
Bolts formed so that they can be opened and closed by slits, tangential bolt holes are provided at both ends that sandwich the slits, and bolt holes in the pipe axis direction are provided at multiple locations. A grip ring formed in a long hole in the radial direction centered on the one bolt hole, and penetrates each bolt hole of the joint body, and is screwed into each female screw of the packing retainer,
A plurality of bolts penetrating through each axial bolt hole of the grip ring, a plurality of nuts screwed into the bolt, a grip bolt penetrating through a tangential bolt hole of the grip ring, and the grip bolt The above object is achieved by a pipe joint having a nut screwed to.

[0005]

[Operation] The joint body, packing, packing retainer and grip ring are pre-assembled with the bolt and nut in the pipe axial direction. At that time, set the dimension between the packing presser and the seat surface of the bolt head in the pipe axis direction to be slightly larger than the thickness of the grip ring, and tighten it so that the grip ring can be opened and closed. Means that the flange portion of the packing is sandwiched between both members and tightened so that the sealing property between the joint body and the packing can be secured. Thereafter, at the connection site, when the pipe is inserted into the pipe receiving portion of the joint body and the grip bolt is tightened, the pipe is gripped by the locking portion of the grip ring. On the other hand, the grip ring and the joint body are already connected by the bolts in the axial direction, the joint body and the packing are already sealed, and the initial inner diameter of the packing is smaller than the outer diameter of the pipe. Therefore, the packing and the pipe are also sealed, and eventually 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 grip bolt.

[0006]

The present invention will be described with reference to the drawings. 1 to 4 show an embodiment of the present invention, in which a joint body 1 of this pipe joint has a packing receiving portion 1a for receiving a packing 2, and a tip of a pipe 8 to be connected to the back side (left side in the drawing) of the packing receiving portion 1a. Is formed, and a cushion 7 is attached to the pipe receiving portion 1b. In this embodiment, flanges 1c are projected at three locations on the outer circumference of the joint body at 120 ° intervals, and axial bolt holes 1d are formed in each flange 1c. The packing 2 is arranged on the inlet side (right side in the drawing) of the joint body. The packing 2 has a flange 2a on the outer circumference, and the inner diameter of the packing 2 is smaller than the outer diameter of the pipe 8. The packing 2 is preferably a self-sealing type, and a double self-sealing type packing of the self-sealing portions 2b and 2d is used in this embodiment. Further, a circumferential projection 2c is provided on the back side of the self-sealing portion 2b, and when the pipe 8 is inserted into this joint as shown in FIG. 4, the deformation effect of the circumferential projection 2c enhances the sealing effect. ing. A disk-shaped packing retainer 3 is provided on the inlet side of the packing 2.
Are arranged, that is, the packing 2 and the packing presser 3 are arranged so that the flange 2a of the packing is sandwiched between the joint body 1 and the packing presser 3.
The packing retainer 3 is provided with three axial female screws 3a at 120 ° intervals.

A grip ring is arranged on the inlet side of the packing presser 3, and in this embodiment, the grip ring is composed of two grip ring pieces 4 and 4. Both grip ring pieces 4 and 4 are formed in a semicircular shape, and a locking projection 4a for preventing axial movement of the tube 8 is formed on the inner peripheral surface thereof.
A central bolt hole 4b and both-side bolt holes 4c, 4c arranged at 120 ° intervals are formed in both grip ring pieces 4, 4 in the axial direction of the pipe. The central bolt hole 4b is provided at one end of each of the grip ring pieces 4 and 4. In the vicinity of the central bolt hole 4b, one grip ring piece 4 has the lower half in the thickness direction cut off, and the other grip ring. The upper half of the piece 4 in the thickness direction is cut off, and thus both grip ring pieces 4 and 4 are engaged with each other in the central bolt hole 4b. The other end of each of the grip ring pieces 4 and 4 forms a slit 4d without coming into contact with each other.
Bolt holes 4e, 4e in the tangential direction are provided at both ends sandwiching. On the other hand, the bolt holes 4c, 4c on both sides are provided in the grip ring pieces 4, 4 respectively, and the bolt holes 4c, 4c on both sides are formed in a long hole in the radial direction centered on the central bolt hole 4b. Thus, both grip ring pieces 4 and 4 are formed so as to be openable and closable around the central bolt hole 4b. Bolts 5 pass through the bolt holes 4b, 4c, 4c in the axial direction of the grip ring piece, and the bolts 5 are screwed into the female screws 3a of the packing retainer 3 to form the bolt holes 1d of the joint body. , And nuts 5a are screwed onto the bolts. A grip bolt 6 penetrates through a tangential bolt hole 4e of the grip ring, and a nut 6a is screwed into the grip bolt 6.

This embodiment is constructed as described above,
The usage of this pipe joint is described below. First, the joint body 1, the cushion 7, the packing 2, the packing presser 3, and the grip ring pieces 4 and 4 are attached to the bolt 5 and the nut 5 in the axial direction.
It is assembled at the factory in advance with a. At this time, the dimension between the head bearing surface of the bolt 5 and the packing retainer 3 is such that the grip ring pieces 4 and 4 can be opened and closed.
The bolt 5 is screwed into the female screw 3a of the packing retainer at a position that is slightly larger than the thickness of the joint body 1
The nut 5a is screwed to the bolt 5 so that the sealing property between the packing 2 and the packing 2 can be ensured. Then, at the connection site, the pipe 8 is inserted into the pipe receiving portion 1b of the joint body so as to come into contact with the cushion 7, and the grip bolt 6 and the nut 6a are inserted.
When and are tightened, the tube 8 is gripped by the locking protrusion 4a of the grip ring piece, and the tube connection is completed as shown in FIG. On the other hand, the grip ring pieces 4, 4 and the joint body 1 are already connected by the bolt 5 in the axial direction, the joint body 1 and the packing 2 are already sealed, and the initial inner diameter of the packing 2 is a pipe. Since it is smaller than the outer diameter of 8, the gap between the packing 2 and the pipe 8 is also sealed, and after all, this pipe joint connects the pipe 8 with a sealing property simply by tightening one grip bolt 6, and therefore the amount of work on site Is reduced to 1/4 compared to the conventional product.

In this embodiment, the axial bolt 5 is inserted from the grip ring side toward the joint body 1 side, but it may be inserted in the opposite direction. At that time, between the joint body 1 and the packing 2. The bolt 5 is screwed to the female screw 3a of the packing presser so that the sealing property can be secured, and then the nut 5a is screwed into the bolt 5 to such an extent that the grip ring can be opened and closed. Further, in the present embodiment, the grip ring is composed of the pair of grip ring pieces 4 and 4 for the purpose of facilitating the opening and closing of the grip ring. It is also possible to integrally form the ring pieces 4 and 4.

[0010]

According to the present invention, the grip ring pieces 4,
Since only 4 is tightened with the grip bolt 6 and the nut 6a, the gripping force of the pipe is fully exerted, the pipe retaining action is sufficient, and the joint body, packing, packing retainer and grip ring are secured with sealing property. Since they can be preliminarily connected in the axial direction, the pipe and the pipe joint can be connected with a sealing property by simply tightening the grip bolt at the connection site, and the connection work amount at the site is greatly reduced.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a cross-sectional view taken along the line BB of FIG. 1 excluding the portion taken along the line AA.

FIG. 4 is a vertical cross-sectional view showing the completion of pipe connection.

[Explanation of symbols]

1 ... Joint body 1a ... Packing receiving part 1
b ... Pipe receiving portion 1c ... Flange 1d ... Bolt hole 2
… Packing 2a… Flange 3… Packing retainer 3
a ... female screw 4 ... grip ring piece 4a ... locking part 4
b ... central bolt hole 4c ... bolt holes on both sides 4d ... slit 4
e ... Bolt hole 5 ... Bolt 5a ... Nut 6
… Grip bolt 6a… Nut 7… Cushion 8
…tube

Claims (2)

[Claims] 1. A joint main body having a pipe receiving portion into which a tip of a pipe to be connected is inserted, and a flange protruding on the outer periphery to form bolt holes in a pipe axial direction at a plurality of positions, and a flange on the outer periphery. The packing retainer has an inner diameter smaller than the outer diameter of the pipe, and the packing flange is sandwiched between the joint body and the female screw in the pipe axial direction. And a locking portion for preventing axial movement of the pipe is formed on the inner peripheral surface so that it can be opened and closed by slitting, and tangential bolt holes are provided at both ends sandwiching the slit, Direction and a grip ring having a plurality of bolt holes provided at a plurality of positions, penetrate each bolt hole of the joint body, screw into each female screw of the packing retainer, and penetrate each bolt hole of the grip ring in the axial direction. A plurality of bolt members and screwed to the bolts A plurality of nut members, a grip bolt member penetrating a tangential bolt hole of the grip ring, and a nut member screwed to the grip bolt. 2. The grip ring comprises two grip ring pieces concentric with one bolt hole in the pipe axis direction,
The pipe joint according to claim 1, which is formed to be openable and closable.