JPH086850B2 - Pipe fittings and rubber packing - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention inserts an end portion of a joint pipe, in which a screw is not engraved, into a receiving portion of a pipe or a joint body,
The present invention relates to a pipe joint of a system in which a metal rubber packing with a wedge, an auxiliary packing, and a sheet member having excellent self-lubricating properties are interposed and fastened, and the rubber packing.

[0002]

2. Description of the Related Art In addition to the simple and inexpensive point, the above-mentioned pipe end screwless pipe joint has elasticity in the joint part, and therefore has a protective function of well absorbing vibration, elongation, distortion and the like of the pipe. Has a relatively small nominal diameter of 13 to 50 mm and a normal pressure of at most 5 kg / cm ^2.
It has been used favorably for joining methods of low-pressure pipes to a certain degree.

However, in the conventional pipe joint, the holding force of the rubber packing with respect to the joint pipe is determined according to the tightening force of the union nut at the time of joining work, so that it is necessary to strongly tighten it with a large pipe wrench or the like in a place where pressure is applied. there were.
In addition, if rust-preventing oil, oil during screw cutting, etc. adheres to the pipe, the force to hold the joint pipe is extremely reduced and it is extremely difficult to reliably prevent the joint pipe from coming off. Met.

Therefore, in the past, measures were taken to solve the problem of retaining the joint pipe by using an annular wedge made of metal. This is as shown in FIG. 10 which is a semi-longitudinal sectional view of FIG. 9 and a partially enlarged view thereof. As shown in the figure, a receiving portion 2 is formed on the pipe end side of the joint body 1, and a male screw 3 is engraved on the outer peripheral surface side of the receiving portion 2.

On the other hand, an annular metal wedge 5, a metallic washer 6 and an annular rubber packing 7 are externally fitted and attached to the joint pipe 4 having no pipe end. The metal wedge 5 has a so-called C-ring shape in which the middle is cut, the back side is a tapered surface 8 with a downward slope toward the rear end side, and the inner peripheral surface side has a serrated uneven portion 9. Has been formed.

Further, the union nut 10 is formed with an internal thread 11 on the inner peripheral surface side of the tip, and the inner surface side of the through hole at the bottom is a tapered surface 12 that abuts the tapered surface 8 of the metal wedge 5. ing.

In the conventional pipe joint thus constructed, when the union nut 10 is tightened, the metal wedge 5
Also, the rubber packing 7 advances through the washer 6 and comes into contact with the receiving portion 2 of the joint body 1 and also with the outer peripheral surface of the joint pipe 4. As the tightening of the union nut 10 progresses, the tapered surface 8 of the metal wedge 5 is pressed by the tapered surface 12 formed on the inner peripheral surface of the through hole, and the metal wedge 5
The sawtooth-shaped uneven portion 9 bites into the outer peripheral surface of the joint pipe 4. As a result, a strong pull-out resistance can be obtained, and the joining pipe 4 can be prevented from coming off.

Moreover, when the joining pipe 4 moves so as to deviate from the joint body 1 (movement to the left in FIG. 5 with respect to the joint body 1), the tapered surface 8 of the metal wedge 5 is unioned. The taper surface 12 of the nut 10 receives a downward pressing force, and the metal wedge 5 further digs into the outer peripheral surface of the joint pipe 4 to prevent deviation.

As described above, in the conventional pipe joint using the union nut 10, the withdrawal force of the joint pipe 4 is improved by using the metal wedge 5 in which the annular part is cut, and It is designed to prevent leakage of flowing fluid.

[0010]

However, in the fastening operation with the union nut 10, the tapered surface 12 of the union nut 10 strongly presses the tapered surface 8 of the metal wedge 5,
At the same time that the wedge 5 bites into the joint pipe 4, the joint pipe 4 is advanced, and as a result, the rubber packing 7 is pressed to secure a predetermined sealing property. Therefore, the rotation of the union nut 10 causes the plating of the tapered surface 8 of the metal wedge 5 to peel off, and abnormal corrosion of the metal wedge 5 progresses from this portion. If there is such abnormal corrosion, the metal wedge 5 is likely to be displaced in the axial direction, the force pressing the rubber packing 7 is reduced, and a seal failure is caused.

Further, as shown in FIG. 10, the step portion 1 cut into the metal wedge 5 is rotated by the rotation of the union nut 10 when it is fastened.
3 is formed, and when the pulling force to the left in the figure acts on the joint pipe 4, the tapered surfaces 8 and 12 between the union nut 10 and the metal wedge 5 do not slip, and the wedge 5 There was a drawback that the pressing force in the diameter reducing direction was not generated. In other words, the holding force of the joining pipe 4 may be reduced, and the joining pipe 4 may easily come off.

Further, since the joint body 1, the union nut 10, the wedge 5 and the joint pipe 4 are mechanically connected and coupled, respectively, these members are integrally locked by an excessive tightening torque. However, there is also a drawback that the expansion and contraction flexibility is lost and the vibration and strain of the pipe cannot be absorbed.

Furthermore, in the final stage of tightening,
Even if the union nut 10 is tightened, the joint pipe 4 may be tightened when the tips of the joint pipe 4 are in contact with each other in the joint body 1 or when the movement of the joint pipe 4 is restricted by the stopper member in the joint body. However, since the rubber packing 7 does not move forward, the rubber packing 7 may not be pressed and sufficient sealing properties may not be ensured. Further, in this case, the wedge 5 only has a reduced diameter, and if the joint pipe 4 is made of vinyl chloride, it has a drawback of weakening it.

As a countermeasure against the case where the wedge 5 does not move forward as described above, it is carried out while striking the rear end side of the metal wedge 5 using a screwdriver, a hammer or the like, but it is a complicated work. Yes, it was not preferable.

[0015]

DISCLOSURE OF THE INVENTION The present invention has been made by improving and removing the conventional problem in view of the above-mentioned problems, and it is a pipe joint which can secure a sufficient sealing property and pull-out resistance only by hand tightening. And the provision of rubber packing.

The first means adopted by the present invention in order to solve the above-mentioned problems is to provide a threaded joint pipe on a pipe or a joint body having a receiving portion with an external thread engraved on its outer peripheral surface. In a pipe joint with a structure in which the union nut is screwed and tightened into the receiving portion by inserting and inserting an annular rubber packing, face the inner bottom surface of the union nut and the back surface side of the rubber packing to the rear side. Taper surface with a downward slope, and a metal wedge is integrally connected to a part of the inner peripheral surface corresponding to the outer peripheral surface of the joining tube of the rubber packing, and the taper surface outer peripheral side facing the union nut side of the rubber packing. The pipe joint is characterized in that an annular auxiliary packing is disposed on the sheet, and a sheet member made of a synthetic resin material having excellent self-lubricating property is interposed between the auxiliary packing and the union nut.

In the second means adopted by the present invention, instead of the sheet member of the first means, one or both of the contact surfaces of the auxiliary packing and the union nut has a small sliding friction resistance, It is coated with a synthetic resin material such as Teflon that is slippery.

Further, the third means adopted by the present invention is to insert a threadless joint pipe into a pipe having a receiving portion or a joint body, insert a ring-shaped rubber packing and insert it, and insert a pressing ring into a bolt and a bolt. In a pipe joint having a structure in which it is tightened to a pipe or a joint body with a nut, the inner bottom surface of the push ring and the back surface side of the rubber packing are tapered surfaces with a downward slope toward the rear side, respectively,
A metal wedge is integrally connected to a part of the inner peripheral surface corresponding to the outer peripheral surface of the joining tube of the rubber packing, and an annular auxiliary packing is provided on the outer peripheral side of the tapered surface of the rubber packing facing the push ring. A pipe joint characterized in that a sheet member made of a synthetic resin material excellent in self-lubricating property is interposed between the auxiliary packing and the push ring.

Further, in the fourth means adopted by the present invention, in place of the sheet member of the second means, one or both of the contact surfaces of the auxiliary packing and the push ring has a small sliding friction resistance, It is coated with a synthetic resin material such as Teflon that is slippery.

Further, a fifth means adopted by the present invention is an annular rubber packing used when a threadless joint pipe is inserted into a pipe having a receiving portion or a joint body and fastened with a push ring or a union nut. In the above, a metal wedge is embedded in a part of the inner peripheral surface side corresponding to the outer peripheral surface of the joining tube of the rubber packing, and the metal wedge projects on the joining tube side surface of the metal wedge at predetermined intervals in the axial direction. The rubber packing is characterized in that protruding biting teeth are provided, and the entire surface side of the metal wedge is integrally covered with a rubber material.

[0021]

In the pipe joint according to the first means of the present invention, the taper of the annular rubber packing having the metal wedge integrally connected to a part of the inner peripheral surface side is provided on the outer peripheral surface side. An auxiliary packing is provided, and a sheet member made of synthetic resin such as Teflon having excellent self-lubricating property is interposed between the auxiliary packing and the inner peripheral surface of the union nut. This seat member effectively transmits the tightening torque of the union nut to the annular rubber packing without reducing the tightening torque by the frictional force between the union nut and the auxiliary packing, and it is sufficient even if it is manually tightened by the worker. The seal function and pullout resistance are obtained.

When the joining pipe moves so as to deviate, the union nut taper surface and the auxiliary packing taper surface press the annular rubber packing toward the joining pipe side with a strong force, and the annular rubber The metal wedge embedded in the packing is forced into the joint pipe to prevent deviation.

The pipe joint of the third means of the present invention is the same as that of the first means except that the union nut is replaced by a push ring, and the basic operation is the same as that of the first means. Further, the second and fourth means of the present invention, in place of the seat member of the first and third means, on one or both of the contact surface of the union nut or the push ring and the auxiliary packing,
It is coated with a synthetic resin material such as Teflon, and the basic operation is the same in this case as well.

In the rubber packing of the fifth means of the present invention, a wedge made of metal is embedded in a part of the inner peripheral surface side and covered with a rubber material, and the wedge member is separated from the rubber packing independently. Since it does not happen, construction work is extremely convenient. In addition, the wedge member does not mix into the joint pipe and the joint body during construction.

Further, the surface of the metal wedge on the side of the joint pipe is provided with biting teeth projecting at predetermined intervals in the axial direction. By disposing the biting teeth in this manner, the pressing force of the wedge can be centrally transmitted to the joining pipe, and as a result, a strong fastening force can be obtained.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below with reference to the embodiments shown in the drawings. The same reference numerals as in the conventional case are the same members. 1 to 5 relate to an embodiment of the first invention, FIG. 1 is a vertical sectional view of a pipe joint showing a state before fastening, and FIG. 2 is a vertical sectional view of a pipe joint showing a state after fastening. Fig. 3 is a vertical cross-sectional view when a pulling force acts on the joint pipe, Fig. 4 is a perspective view of the rubber packing as seen from the rear side, and Fig. 5 is a partial cross-sectional perspective view of the rubber packing as seen from the front side. is there.

As shown in FIGS. 1 to 3, the union nut 14 according to this embodiment has an inner bottom surface formed into a tapered surface 15 which is downwardly sloped rearward (to the left in FIG. 1).
As shown in FIGS. 1 to 5, the annular rubber packing 16
Is formed on the taper surface 17 of which the back side is downwardly inclined rearward (to the left in FIGS. 1 to 3), and the receiving portion 2 of the joint body 1 is formed.
The portion to be joined with the tapered surface is formed on the tapered surface 18 having a downward slope toward the tip side (right direction in FIGS. 1 and 2).

Further, metal wedges 19 are integrally connected to the rear end side of the rubber packing 16 at three positions equidistantly distributed on the circumference. The metal wedge 19 need not be exposed to the outer peripheral surface side of the rubber packing 16 as long as it is exposed to at least the inner peripheral surface side of the rubber packing 16 and is joined to the outer peripheral surface side of the joining pipe 4. . That is, the metal wedge 19 may be embedded on the inner peripheral surface side of the rubber packing 16.

The tapered surface 15 of the union nut 14
In the space between the rubber packing 16 and the tapered surface 17 of the rubber packing 16, auxiliary packings having the same tapered surfaces as the tapered surfaces 15 and 17 are provided. This auxiliary packing 20 is also annular and is made of a rubber material. Further, a protrusion (not shown) for rotation prevention is formed on a part of the inner peripheral surface on the tip side of the auxiliary packing 20, and the outer peripheral surface of the rubber packing 16 facing the protrusion is shown in FIG. As shown in FIG. 5, a recess 22 is formed. These protrusions and recesses 22 may be annular stripes and grooves.

Further, between the outer peripheral surface side of the auxiliary packing 20 and the inner peripheral surface side of the union nut 14, a synthetic resin sheet member 23 having excellent self-lubricating property is fitted. . Teflon is most suitable for the sheet member 23.

The inner diameters of the annular rubber packing 16 and the auxiliary packing 20 are set to be larger than the outer diameter of the threadless joint pipe 4 by a dimension t = 0.3 to 0.5 mm. It is designed so that the mounting work to the No. 4 can be performed easily. Further, the tip outer diameter C of the metal wedge 19 in FIGS. 1 to 3 of the rubber packing 16 is set to be smaller than the inner diameter D of the bottom of the union nut 14 when the union nut 14 is contracted.

This dimensional relationship is such that when a force in the direction of departure is applied to the joint pipe 4, a part of the metal wedge 19 enters the bottom of the union nut 14 together with the auxiliary packing 20, so that the metal Applying a force in the diameter reducing direction to the wedge 19,
This is for improving the tightening holding force of the joint pipe 4.
The area where the metal wedge 19 enters the bottom of the union nut 14 is sufficient from the left end side to a location of 1/4 to 1/2, and thus the thickness and the taper angle of the metal wedge 19 are large. It is set.

Next, an operation mode in the case where a pipe joint is constructed by using each member constructed as described above will be described. First,
The union nut 14, the seat member 23, the auxiliary packing 20, and the rubber packing 16 are externally fitted and mounted on the outer peripheral surface of the distal end of the joining pipe 4 in this order. And union nut 1
The female screw 11 of No. 4 is screwed into the male screw 3 of the joint body 1, and the tightening by hand is started as shown in FIG.

The tightening force of the union nut 14 advances the auxiliary packing 20 and the rubber packing 16 (moves to the right in FIGS. 1 to 3) through the synthetic resin sheet member 23 having excellent self-lubricating property. . Then, in the rubber packing 16, the taper surface 18 at the tip comes into contact with the receiving portion 2 of the joint body 1 in time, and thereafter, the stress is applied in the diameter reducing direction by this, and as shown in FIG. It comes into strong contact with the joint pipe 4, and the rubber packing 16 secures a sufficient sealing property between the socket 2 of the joint body 1 and the joint pipe 4.

In this case, the synthetic resin sheet member 23
Prevents the direct contact between the union nut 14 and the auxiliary packing 20 and significantly reduces the frictional force on the back side of the auxiliary packing 16, thereby reducing the tightening torque of the union nut 14 without decreasing the auxiliary packing 20.
The rubber packing 16 is effectively transmitted.

As a result, the receiving portion 2 of the rubber packing 16
Also, it is possible to increase the frictional force on the joint pipe 4 and to exert a sufficient sealing function. In this way, the auxiliary packing 2 is provided between the union nut 14 and the rubber packing 16.
0, and a sheet member 23 having excellent self-lubricating property is disposed between them to reduce a frictional force between the auxiliary packing 20 and the sheet member 23. Can be exhibited, and the work of constructing the pipe joint becomes extremely simple.

Auxiliary packing 20 and rubber packing 1
Since the tightening torque by the union nut 14 is effectively transmitted to 6, the metal wedge 19 partially integrally connected to the rubber packing 16 bites into the outer peripheral surface of the joint pipe 4 with sufficient force, and holds it tightly. Have the function to

Next, the case where the joint pipe 4 moves to deviate from the joint body 1 from such a state is shown in FIG.
Will be described with reference to. In this case, the joint pipe 4 is the joint body 1
On the other hand, it tries to move relatively to the left side of FIG.
However, when such a movement of the joint pipe 4 occurs, the auxiliary packing 20 utilizes the tapered surface 15 to the inner peripheral surface of the union nut 14 mechanically integrated with the joint body 1 to the left in FIG. And the compressive force of the auxiliary packing 20 increases.

As a result, the rubber packing 16 receives a stress in the diameter reducing direction due to the tapering action of the taper surface 17 on the rear side, and the metal wedge 19 further digs into the joint pipe 4, preventing the joint pipe 4 from escaping. Work. Also in this case, the sheet member 23 made of synthetic resin having excellent self-lubricating property
Prevents the auxiliary packing 20 and the union nut 14 from coming into direct contact with each other and remarkably reduces the frictional force on the back side of the auxiliary packing 20 to reduce the movement of the auxiliary packing 16 in the radial direction. The joint pipe 4 is converted and held with a strong force to prevent the joint pipe 4 from deviating.

In the second means of the present invention, instead of the sheet member 23 of the first means, a synthetic resin material such as Teflon which has the same function (low sliding friction resistance and is slippery) is used.
Union nut 14 inner peripheral surface side or auxiliary packing 2
The outer peripheral surface side of 0 or both of them are coated.

Next, an embodiment of the third means of the present invention will be described with reference to FIG. As shown in the figure, in this embodiment, a push ring 24 is used instead of the union nut 14 of the first means. This push ring 24
Is fastened to the flange 27 of the joint body 1 using the bolt 25 and the nut 26. Fastening with the bolt 25, the nut 26, and the flange 27 is performed at several places in the entire circumferential direction.

In the embodiment of the third means, the seat member 23, the auxiliary packing 20, and the annular rubber packing 16 are fitted in the push ring 24, and the push ring 24 is placed first in the fitting main body 1. It is more workable to temporarily fix the joint pipe 4 and then insert the joining pipe 4 into the receiving portion 2 of the joint body 1 by penetrating the push ring 24 and the rubber packing 16.

Therefore, if the push ring 24 is strongly fitted to the joint body 1 side before the joining pipe 4 is inserted, the diameter of the rubber packing 16 is reduced and it becomes difficult to insert the joining pipe 4. Therefore, in this embodiment, the temporary fixing member 28 made of hard vinyl chloride is mounted between the push ring 24 and the outer peripheral surface of the receiving portion 2 of the joint body 1. This temporary fixing member 2
8 is drawn flat when the final tightening is performed,
Intervene in that state. Other configurations and effects
This is the same as the case of the embodiment of the first invention described above.

In the fourth means of the present invention, the sheet member 23 of the third means is omitted, and instead, a synthetic resin material such as Teflon which has the same function (less sliding friction resistance and is slippery) is used as a push ring. The inner peripheral surface side of 24, the outer peripheral surface side of the auxiliary packing 20, or both of them are covered.

Next, an embodiment of the fifth means of the present invention will be described with reference to FIGS. In this example,
On the inner peripheral surface side of the metal wedge 19 embedded in the annular rubber packing 16, biting teeth 29 are projected and dispersed at predetermined intervals in the tube axis direction. In this way, by making the biting teeth 29 disperse and project, the metal wedge 19
The surface of the rubber material thinly coated on the inner peripheral surface side of the
A space 21 (see FIG. 7) can be formed between and. This space 21 is for securing a biting margin of the biting tooth 29 into the joint pipe 4.

Further, by distributing the biting teeth 29, it is possible to concentrate the stress acting on the metal wedges 19 on these distributed biting teeth 29. Therefore, due to the space 21 and the distributed biting teeth 29, the reducing force acting on the rubber packing 16 is concentrated on the biting teeth 29, and the biting teeth 29 are connected to each other within the range of the space 21. 4 will be bitten by a stronger force, and as a result, a strong tightening holding force for preventing deviation of the joint pipe 4 will be obtained.

Further, as shown in FIG. 8, the biting teeth 29 are manufactured by a ring-shaped split mold composed of left and right rubber molds 30 and 31 and a core mold 32. By providing the convex portion 33 that comes into contact with the concave portion between the biting teeth 29 of the metal wedge 19, the biting teeth 2 at the time of manufacturing
9 and the core die 32 do not come into contact with each other, and the life of the molding die can be extended.

By the way, the present invention is not limited to the above-mentioned embodiment, and for example, the metal wedge 19 may be partially embedded in a part of the rubber packing 16 on the inner peripheral surface side. Good. Further, the case where three metal wedges 19 are arranged at equal positions on the circumference has been described, but a plurality of metal wedges 19 may be provided. The number of installations may be determined according to the size of the joining pipe 4, the size of the metal wedge 19, and the like.

Further, the metal wedge 19 and the rubber packing 16
Needless to say, in addition to the case of integrally molding in a factory or the like, it may be integrally bonded in the field or the like by using an adhesive. Furthermore, the upper surface side of the rubber packing 16 may be a flat surface having substantially the same height as the maximum outer diameter surface of the metal wedge 19.

[0050]

As described above, in the first and second means of the present invention, a metal wedge is integrally connected to at least a part of the annular rubber packing on the inner peripheral surface side, and the rubber packing rear surface is formed. Since the auxiliary packing and the seat member made of synthetic resin with excellent self-lubricating property are arranged between the taper surface on the side and the taper surface side of the union nut or the push ring, the tightening torque of the union nut or the push ring can be adjusted. The auxiliary packing and the rubber packing can be reduced in diameter by being effectively transmitted to the auxiliary packing without being reduced by the frictional force between the push ring and the auxiliary packing, and a sufficient sealing function can be achieved even if the operator tightens it by hand. And pulling resistance can be exhibited.

Further, since the auxiliary packing and the rubber packing are interposed, the union nut or the pressing ring and the metal wedge are never in a mechanically locked state, and a force in the deviation direction is exerted on the joint pipe. Even if it works
It is possible to provide an excellent pipe joint of this type without always impairing the stretch flexibility.

Further, in the final stage of tightening, even if the tips of the joint pipes are in contact with each other in the joint body or the movement of the joint pipe is restricted by the stopper member in the joint body, The elastic force between the auxiliary packing and the rubber packing makes it possible to further tighten the union nut or the push ring. In this case, the elastic compression force between the auxiliary packing and the rubber packing becomes even stronger, and the metal wedge becomes the joint pipe. The rubber packing can secure excellent watertightness while being able to hold it tightly.

Furthermore, in the past, if rust-preventing oil, oil for thread cutting, etc. adhered to the pipe, the force for holding the joint pipe would be extremely reduced, and the joint pipe could be reliably removed. It was extremely difficult to prevent, but in the present invention, even when these oils are present, the metal wedge bites into the joint pipe,
It is possible to reliably prevent the deviation.

Further, when the joining pipe moves so as to deviate, the auxiliary packing is prevented from directly contacting the union nut or the push ring with the synthetic resin sheet member, and the frictional force on the back side of the auxiliary packing is reduced. By doing so, a large compressive force is generated in the auxiliary packing, and as a result, it is possible to reduce the diameter of the rubber packing and force the metal wedge to bite into the joint pipe to prevent the deviation.

On the other hand, in the rubber packing of the fifth means of the present invention, a metal wedge is embedded in a part of the inner peripheral surface side and covered with a rubber material, and the wedge member is independent of the rubber packing. Construction work is extremely convenient because it is not loose.
In addition, the wedge member does not mix into the joint pipe and the joint body during construction. In addition, since the metal wedge is not exposed, it does not cause abnormal corrosion.

Further, the surface of the metal wedge on the side of the joint pipe is provided with biting teeth dispersed at predetermined intervals in the axial direction, thereby providing a space for securing a biting margin with the joint pipe. Can be formed, and the pressing force of the wedge can be centrally transmitted to the joint pipe, resulting in a strong fastening force.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a state before fastening of a pipe joint according to a first means of the present invention.

FIG. 2 is a vertical cross-sectional view showing a state after fastening of the pipe joint according to the first means of the present invention.

FIG. 3 is a vertical cross-sectional view showing a case where a force in a departure direction is applied to the pipe joint according to the first means of the present invention.

FIG. 4 is a perspective view of a rubber packing according to the present invention viewed from the back side.

FIG. 5 is a partial cross-sectional perspective view of the rubber packing according to the present invention viewed from the front side.

FIG. 6 is a vertical sectional view of a pipe joint according to a third means of the present invention.

FIG. 7 is a vertical sectional view showing a pipe joint according to a fifth means of the present invention.

FIG. 8 is a partial vertical cross-sectional view showing a molding die for rubber packing according to a fifth means of the present invention.

FIG. 9 is a semi-longitudinal sectional view showing a conventional pipe joint.

FIG. 10 is a partially enlarged view of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Joint main body 2 ... Receptacle part 3 ... Male screw 4 ... Junction pipe 11 ... Female screw 14 ... Union nut 15 ... Union nut taper surface 16 ... Rubber packing 17 ... Tapered surface on the back side of rubber packing 18 ... Tip of rubber packing Side tapered surface 19 ... Metal wedge 20 ... Synthetic resin sheet member

Claims (5)

[Claims] 1. A pipe having a socket having an external thread engraved on the outer peripheral surface thereof, or a joint body, into which a threadless joint pipe is inserted, and an annular rubber packing is inserted and inserted to insert the union nut into the socket. In a pipe joint with a structure that is screwed and tightened, the inner bottom surface of the union nut and the back surface side of the rubber packing are tapered surfaces that slope downward toward the rear side, and the inner circumference corresponding to the outer peripheral surface of the joint tube of the rubber packing is A metal wedge is integrally connected to a part of the surface, and an annular auxiliary packing is arranged on the outer peripheral side of the taper surface facing the union nut side of the rubber packing, and between the auxiliary packing and the union nut. A pipe joint in which a sheet member made of a synthetic resin material having excellent self-lubricating property is interposed. 2. A pipe having a socket having an external thread engraved on its outer peripheral surface or a joint body is inserted into a joint pipe having no thread, and a ring-shaped rubber packing is inserted and inserted to insert the union nut into the socket. In a pipe joint with a structure that is screwed and tightened, the inner bottom surface of the union nut and the back surface side of the rubber packing are tapered surfaces that slope downward toward the rear side, and the inner circumference corresponding to the outer peripheral surface of the joint tube of the rubber packing is A metal wedge is integrally connected to a part of the surface, an annular auxiliary packing is arranged on the outer peripheral side of the tapered surface facing the union nut side of the rubber packing, and a contact surface between the auxiliary packing and the union nut. One or both of these are coated with a synthetic resin material such as Teflon, which has low sliding friction resistance and is slippery, and is coated. 3. A structure having a structure in which a threadless joint pipe is inserted into a pipe or a joint body having a receiving portion, an annular rubber packing is inserted and fitted, and a push ring is tightened to the pipe or the joint body with bolts and nuts. In the pipe joint, the inner bottom surface of the push ring and the back surface side of the rubber packing are tapered surfaces with a downward slope toward the rear side, respectively, and a part of the inner peripheral surface corresponding to the outer peripheral surface of the joining tube of the rubber packing is made of metal. A wedge is integrally connected, and an annular auxiliary packing is provided on the outer peripheral side of the tapered surface of the rubber packing that faces the pressing wheel side. A synthetic resin material having excellent self-lubricating property is provided between the auxiliary packing and the pressing wheel. A pipe joint characterized in that a sheet member of 4. A structure having a structure in which a threadless joint pipe is inserted into a pipe or a joint body having a receiving portion, an annular rubber packing is inserted and inserted, and a push ring is tightened to the pipe or the joint body with bolts and nuts. In the pipe joint, the inner bottom surface of the push ring and the back surface side of the rubber packing are tapered surfaces with a downward slope toward the rear side, respectively, and a part of the inner peripheral surface corresponding to the outer peripheral surface of the joining tube of the rubber packing is made of metal. A wedge is integrally connected, and an annular auxiliary packing is provided on the outer peripheral side of the tapered surface of the rubber packing that faces the pressing wheel side, and sliding friction resistance is provided on either or both of the contact surfaces between the auxiliary packing and the pressing wheel. A pipe joint characterized by being coated with a synthetic resin material such as Teflon that is less slippery and slippery. 5. A ring-shaped rubber packing used when a threadless joint pipe is inserted into a pipe having a socket or a joint body and fastened with a push ring or a union nut, the outer periphery of the joint pipe of the rubber packing. A metal wedge is embedded in a part of the inner peripheral surface side corresponding to the surface, and biting teeth projecting at predetermined intervals in the axial direction are projected on the joint pipe side surface of the metal wedge. A rubber packing in which the entire surface of the wedge is integrally covered with a rubber material.