JPH0726632Y2 - Pipe fitting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a pipe joint for connecting a joint body and a connecting pipe.

<Prior art> Conventionally, for example, when connecting a pressure pipe with a pulsating flow in a high-rise apartment house, the flange of the pipe joint, the locking ring, and the rubber packing are externally fitted to the connection pipe, and the connection pipe end is received in the joint body. Then, the locking ring and the packing are crimped to the outer circumference of the connecting pipe by tightening the flange and the joint body to secure the watertightness and the connecting strength of the connecting portion.

<Problems to be solved by the invention> However, in such a conventional pipe joint, the gripping force of the connecting pipe due to the tightening of the flange to the joint body is small, which is insufficient for pressure pipes with a large impact pressure. It was natural.

Therefore, there has been proposed a pipe joint in which a part of a push wheel (corresponding to the above-mentioned flange) that presses the packing is made into a clamp structure with a cut ring, and a thread is formed on the inner peripheral surface of the push wheel (for example, See Japanese Utility Model Publication No. 63-139390).

According to this pipe joint, the flange portion of the push ring is bolted to the joint body to ensure water tightness by the packing, and the slit portion of the push ring is tightened with bolts to crimp the inner peripheral surface of the push ring to the outer peripheral surface of the connecting pipe. Therefore, the gripping force of the connecting pipe was improved.

However, in this pipe joint, since the packing part and the clamp part have an integrated structure, special caution is required for the tightening.

For example, when the clamp portion is tightened after the flange portion is tightened, unless the flange portion is tightened uniformly, the clamp portion will be tilted to the outer peripheral surface of the connecting pipe and tightened.
Therefore, the crimping force due to the screw thread is insufficient, the packing is in one-sided state, sufficient pipe gripping force and watertightness cannot be obtained, and an excessive tightening force is required for tightening the clamp part. Atsuta

Also, when tightening the clamp part before tightening the flange part, if the distance from the clamp part to the connecting pipe end is larger than the specified value, the pipe end will contact the stopper part on the joint body side before the packing is tightened, There was a problem that the watertightness could not be secured. In this case, if tightened further, the tightening force acts as a compressive stress at the end of the pipe and the connecting portion may be damaged due to thermal expansion and contraction of the connecting pipe due to the flow of hot and cold water.

Also, if the distance between the clamp part and the connecting pipe end is smaller than the specified value, a large gap is formed between the pipe end and the stopper part of the joint body, and dirt, etc. in the drainage is accumulated in the gap and clogging occurs. There was a problem that caused the.

As described above, connection of the connecting pipe to the joint body requires time and effort for setting the tightening position of the pipe joint, tightening the flange portion and the clamp portion, and requires skill.

The present invention has been made to solve the above-mentioned problems, and the purpose thereof is to ensure proper watertightness by a simple work and to firmly grip the connecting pipe. It is intended to provide a pipe joint.

<Means for Solving the Problem> The present invention has been made to achieve the above object, and a pipe joint of the first invention is to insert a connecting pipe end into a receiving port having a flange portion of a joint body. In addition, a pipe joint for connecting the connecting pipe by sandwiching a packing between the receiving port, and having a pressing portion formed in a substantially annular shape, the connection standing upright on the pressing portion. A flange provided with an ear piece having a band hole penetrating in a direction orthogonal to the axis of the pipe and having a mounting hole penetrating in a direction parallel to the axis, and the flange attached to the ear piece of the flange, and the connecting pipe And a gripping band having a grip portion capable of being crimped on the outer peripheral surface thereof, and a gripping band formed on the inner peripheral surface of the grip portion so as to prevent the grip from coming off.

The pipe joint of the second invention is a pipe joint in which a connecting pipe end is inserted into a socket having an external thread of the joint body and a packing is inserted between the socket and the socket to connect the connecting pipe. At the same time, it has an annular pressing portion that is provided at one end of the cylindrical body.
An ear piece having a band hole penetrating in a direction orthogonal to the axis of the connecting pipe is provided upright on the pressing portion, and the inner peripheral surface of the main body portion is screwed to the male screw portion of the joint main body. A bag nut having a threaded portion and an ear piece of the bag nut, which is attached to the outer peripheral surface of the connecting pipe and has a grip portion that can be crimped to prevent the inner peripheral surface of the grip portion from coming off. A gripping band having irregularities is provided, which is a pipe joint.

The gripping band in the first and second inventions may be formed of a flat plate-shaped member and may have a gripping portion curved in a substantially semicircular shape. <Operation> This invention is configured as described above. In the first invention, the flange is tightened to the joint body through the mounting hole, and the pressing portion presses the packing or the like to ensure watertightness. Then, the gripping band is attached to the ear piece of the flange, and the inner peripheral surface of the gripping portion having irregularities is crimped to the outer peripheral surface of the connecting pipe to grip the connecting pipe and prevent the connecting pipe from moving in the pipe axial direction.

In the second invention, the bag nut is screwed into the joint body by the female screw portion thereof, and the pressing portion presses the packing or the like to ensure watertightness. Then, the gripping band is attached to the ear piece of the bag nut, and the inner peripheral surface of the gripping portion having irregularities is pressure-bonded to the outer peripheral surface of the connecting pipe to grip the connecting pipe to prevent the connecting pipe from moving in the pipe axial direction.

Further, when gripping the connection pipe in the pressure pipe having a relatively small impact pressure, the connection pipe is gripped using a grip band made of a flat plate-shaped member.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

First, referring to FIG. 1 to FIG.
An example will be described.

The pipe joint of the first embodiment mainly comprises a flange 10 having a pressing portion 11 and a pair of ear pieces 16, and a pair of grip bands 20 having a grip portion 21.

The flange 10 has a deformed polygonal pressing portion 11 having a substantially annular shape in the embodiment, and a fitting hole 12 into which the connecting pipe 6 can be fitted is provided at the center thereof.

Further, at a predetermined position of the pressing portion 11, a mounting hole 13 corresponding to a flange portion mounting hole of the joint body 1 which will be described later is provided so as to be parallel to the pipe axis of the connecting pipe 6. Further, the pressing portion 11
A pair of ear pieces 16 are erected axially symmetrically on the outer peripheral portion of the upper surface of the. Each ear piece 16 is provided with a band hole 17 in a direction orthogonal to the tube axis.

The grip band 20 has a grip portion 21 that is curved and formed in a substantially semicircular shape corresponding to the outer peripheral surface of the connecting pipe 6, and mounting leg portions 22 are provided at both ends thereof. A thread having a triangular cross section is threaded on the inner peripheral surface of the grip portion 21, and a hole 23 for mounting the ear piece 16 is formed in the mounting leg portion 22.

The pipe joint configured as described above is mounted between the joint body 1 and the connecting pipe 6 as shown in FIGS. 5 and 7,
Both are connected.

This joint body 1 is provided with a receiving port 2 having a flange portion 3, and the inside of the receiving port 2 is formed so that a connecting pipe 6 can be inserted therein. Further, the flange portion 3 has a mounting hole for the flange 10. Reference numeral 5 is a stopper portion for positioning the end of the connecting pipe 6.

The connecting pipe 6 includes a flange 10 and an annular locking ring 7,
The collar 8 and the packing 9 are externally fitted, and the pipe end portion is inserted into the receiving port 2 of the joint body 1.

Then, the end of the connecting pipe 6 is brought into contact with the stopper portion 5 for positioning, and the packing 9 is brought into close contact with the receiving opening 2 and the flange 10 is brought into contact. At this time, the ear piece 16 is positioned so as to project toward the connecting tube 6 side.

In this state, 3 sets of bolts 18 and nuts 19 allow the flange 1
Tighten 0 to the joint body 1. As a result, the pressing portion 11 of the flange 10 presses the locking ring 7, the collar 8 and the packing 9 in the tube axis direction. Incidentally, as shown in FIG. 6, there is also a mode in which the locking ring and the collar are not attached. Then, the packing 9 is deformed by compression and pressure-bonded to the inner peripheral surface of the receiving port 2 and the outer peripheral surface of the connecting pipe 6 to ensure watertightness.

Further, two grip bands 20 are attached to the pair of ear pieces 16 of the flange 10. The two gripping bands 20 are aligned with the axes of the holes 23 and the band holes 17 of the ear pieces 16 with the connecting tube 6 sandwiched therebetween, and are fastened to the ear pieces 16 with two sets of bolts 27 and nuts 28.

By this tightening, the grip portions 21 of both grip bands 20 are pressed against substantially the entire circumferential surface of the connecting pipe 6, and the threads formed on the inner peripheral surface of the grip portion 21 firmly grip the connecting pipe 6.

Then, the movement of the connecting pipe 6 in the axial direction is prevented, and the influence of the withdrawal of the connecting pipe 6 due to impact pressure and the thermal expansion and contraction of the connecting pipe 6 due to the flow of hot and cold water at the connecting portion is suppressed.

As described above, according to this pipe joint, the tightening for crimping the packing 9 by the flange 10 and the tightening for gripping the connecting pipe 6 by the grip band 20 can be performed individually and individually without being influenced by each other. It can be done accurately.

Since the grip band 20 has a substantially semi-circular shape, it can be attached after the flange 10 is tightened and does not affect the flange 10 tightening work.

8 to 12 show another embodiment of the present invention,
The pressing member of the packing is characterized in that it is formed in a bag nut shape.

The pipe joint of the second embodiment includes a pressing portion 31 and a pair of ear pieces.
The bag nut 30 having 36 and the pair of grip bands 20 described above are mainly configured.

The bag nut 30 has a cylindrical main body 33, and an annular pressing portion 31 is formed at one end thereof.

A fitting hole 32 into which the connecting pipe 6 can be fitted is provided in the center of the pressing portion 31.
Are provided, and a pair of ear pieces 36 are erected axially symmetrically on the outer peripheral portion of the upper surface of the pressing portion 31. This earpiece 36 has
Band holes 37 are formed in the respective directions orthogonal to the tube axis.

Further, on the inner peripheral surface of the main body portion 33, a female thread portion 34 that is paired with a male thread portion 53 of the joint main body 51, which will be described later, is threaded, and further on the outer peripheral surface of the main body portion 33, a spline-shaped ridge 35 is formed. Has been formed.

As shown in FIG. 11, the joint main body 51 adapted to the second embodiment is provided with a male screw portion 53 on the outer peripheral side of a receiving port 52 into which the connecting pipe 6 can be inserted. Incidentally, 55 is a stopper portion of the connecting pipe 6.

According to the pipe joint of the second embodiment, the bag nut 30 and the packing 59 are fitted onto the connecting pipe 6, and the pipe end thereof is inserted into the socket 52 of the joint body 51. Then, the female thread portion 34 of the bag nut 30 is screwed into the male thread portion 53 of the joint body 51, and the bag nut 30 is rotated to advance in the axial direction.

As a result, the pressing portion 31 presses the packing 59,
Watertightness is secured by crimping 59 onto the joint body 51 and the outer peripheral surface of the connecting pipe 6.

On the other hand, two grip bands 20 are attached to the pair of ear pieces 36 of the bag nut 30 by the bolts 27 and nuts 28 as in the first embodiment, and the connection pipe 6 is gripped by the tightening. 21,2
Strongly gripped by 1.

13 and 14 show another embodiment of the grip band of this invention.

The grip band 40 is formed of a flat plate-shaped member, and has a grip portion 41 that is curved and formed in a substantially semicircular shape corresponding to the outer peripheral surface of the connection pipe 6.
And mounting leg portions 42 respectively provided at both ends thereof. Reference numeral 43 is a hole for a bolt to be attached to the ear piece.

Depending on the degree of impact pressure, grip band 20 or grip band 40
It is preferable to select either of the above.

The present invention is not limited to the above description and the illustrated examples, and its embodiment can be changed without departing from the technical idea of the present invention.

For example, the unevenness formed on the inner peripheral surface of the grip portion 21 of the grip band 20 may be a projection having a triangular cross section formed in a mesh shape, or formed by a large number of hemispherical projections. It may be one that has been processed.

Further, the grip band may be composed of one body as shown in FIGS. 15 and 16. The grip band 60 has a C-shaped grip portion 61, and an inner peripheral surface of which is threaded. Further, mounting leg portions 62 are provided at both ends of the grip portion 61 in a relative shape, and the mounting leg portions 62 are also projectingly provided on the outer peripheral portion on the opposite side. Each of the mounting leg portions 62 has a hole 63 for mounting.

The flange or bag nut may be provided with one ear piece. In this case, two gripping bands 20 or 40 described above or one gripping band 60 may be used to connect the connecting pipe. A cantilevered grip of 6 is performed.

<Effects of the Invention> Since the pipe joint of the present invention has the above-described configuration, the tightening for crimping the packing with the flange or the bag nut and the tightening for gripping the connecting pipe with the gripping band are performed.
It can be done individually and accurately without being affected by each other.

Therefore, proper watertightness of the packing can be ensured, and the connecting pipe can be gripped by a strong gripping force to prevent the connecting pipe from moving in the axial direction. Therefore, it is possible to prevent the influence of the connection pipe being pulled out by the impact pressure and the thermal expansion and contraction of the connection pipe due to the hot and cold water flow.

As described above, according to the pipe joint of the present invention, the position of the pipe joint can be easily set and tightened, and the connection pipe can be gripped with a large gripping force to make an accurate connection. Play.

[Brief description of drawings]

FIG. 1 is a plan view of a flange in a pipe joint of an embodiment of the present invention, FIG. 2 is a side view of the same, FIG. 3 is a plan view of a grip band, FIG. 4 is a side view of the same, and FIG. FIG. 6 is a side sectional view showing an example of the connection between the joint body and the connecting pipe by a joint, FIG. 6 is a side sectional view showing another example of the connection, FIG. 7 is a plane sectional view of FIG. 5, and FIG. A plan view of the bag nut of the second embodiment, FIG. 9 is a side view of the same, FIG. 10 is a side sectional view of the same, and FIG. 11 shows the connection between the joint body and the connecting pipe by the pipe joint of the second embodiment. Side sectional view, FIG. 12 is a front sectional view of FIG. 10, FIG. 13 is a plan view showing an example of another holding band, FIG. 14 is a side view of the same, and FIG. 15 is an example of yet another holding band. And FIG. 16 is a side sectional view of the same. 1,51 …… Coupling body, 6 …… Connection pipe, 10 …… Flange, 1
1,31 …… Pressing part, 16,36 …… Ear piece, 20,40 …… Grip band, 21,41 …… Grip part, 30 …… Bag nut.

Claims (3)

[Scope of utility model registration request] 1. A pipe joint in which a connecting pipe end is inserted into a receiving port having a flange portion of a joint body, and a packing is inserted between the receiving port and the connecting pipe to connect the connecting pipe, wherein the connecting pipe has a substantially annular shape. An ear piece having a pressing part formed on the pressing part and having a band hole penetrating in a direction perpendicular to the axis of the connecting pipe and provided on the pressing part and penetrating in a direction parallel to the axis. A flange having a hole for use, and a grip portion that is attached to the ear piece of the flange and that can be crimped on the outer peripheral surface of the connection pipe, and an unevenness for retaining is formed on the inner peripheral surface of the grip portion. And a gripping band that is provided. 2. A pipe joint for connecting the connecting pipe by inserting a connecting pipe end into a receiving port having an external thread portion of a joint body and sandwiching a packing between the receiving port and the connecting pipe. An ear piece having a ring-shaped pressing part provided at one end of the main body and having a band hole penetrating in a direction perpendicular to the axis of the connecting pipe and standing on the pressing part, and A bag nut having an internal thread on the inner peripheral surface of the main body that is screwed into the external thread of the joint body, and a gripping part that is attached to the ear piece of the bag nut and can be crimped to the outer peripheral surface of the connection pipe. And a gripping band having an unevenness for preventing the grip from being pulled out on the inner peripheral surface of the gripping part. 3. The grip band has a grip portion formed of a flat plate member and curved in a substantially semicircular shape.
Pipe fittings described in 1 and 2.