JPH0246831B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pipe connecting device for interconnecting opposite ends of linearly arranged pipe bodies.

[Problems to be solved by conventional technology and invention]

As a conventional pipe connection device of this type, Japanese Patent Application Laid-open No. 55-76282
The one disclosed in the above publication is known. That is,
A cylindrical joint main body having an inclined surface with a diameter increasing outward on both ends of the inner wall surface and a screw threaded onto the outer peripheral surface of both ends, and a cylindrical joint main body having a screw threaded into the main body on one end side of the inner wall surface. A screw is screwed into the screw, and the opposite end has a pair of left and right tightening ring bodies each having an inclined surface that widens as it goes away from the insertion opening. , a holding member made of an elastic body in which a large number of balls serving as biting members are disposed in each of the tightening rings, an airtight member interposed on the inclined surface of the main body, and a combination of the airtight member and the holding member. This pipe connecting device has a built-in stop ring that is interposed between the two members to press and move the two members, and allows pipes inserted into the joint body from both ends to be tightened and connected by the ring body that is screwed into the joint body. According to the publication, spheres 7, 7, which are biting members, are arranged at a constant interval in the circumferential direction of the annular elastic holding member 8.
Open holes are provided for fitting the spheres 7, 7, etc. into the open holes, respectively.

For example, when the pipe connecting device is buried underground, depending on the underground condition, the spheres 7, 7... supported by the elastic holding member 8 may be connected to the outer surface of the pipe body 6 and the tightening ring. When it is pressed by the inclined surface b of 4 and bites into the outer surface of the tube 6, it has a point contact structure with the tube 6, so it easily slips and has a sufficient prevention effect and seal. There were some cases where the results were not as expected. In particular, the tube body 6
In the case of synthetic resin pipes, etc., which have slippery surfaces, the above-mentioned drawbacks are noticeable.

In addition, the above-mentioned slip phenomenon of the sphere can be prevented and a sufficient biting effect can be expected.
The one described in Japanese Utility Model Application Publication No. 99542 and the one described in Japanese Utility Model Application Publication No. 105114/1988 are known, but
The device described in 99524 has a rectangular clasp 7 fitted into a fitting hole opened in the axial direction at the center of an annular synthetic resin holder 6 in a manner corresponding to the radius of the synthetic resin holder 6. It is formed into a rounded shape, and the end of the clasp is formed into a sharp edge 8 on the surface of the center hole of the synthetic resin holder, and the edge 8 is cut into the surface of the cylinder 4. It is. Therefore, when rotating and fastening the fastener 10, the fastener 10
is screwed in while pressing the synthetic resin holder 6 from above, but since the edge 8 of the clasp 7 bites into the surface of the cylindrical body 4, the synthetic resin holder 6 There is a defect in that the fastener 10 does not rotate, and therefore the tightening torque of the fastener 10 becomes extremely large, making the fastening operation difficult. Also, Mikiakiaki
52-10514, a socket end 2 is formed at the connecting end of a cast iron pipe 1, a rubber packing 4 is interposed in the socket part 2, and a tightening bolt is installed in the socket part 2. A pressing ring 6 is attached by 5.
Then, the rubber packing 4 is crimped onto the inner step 7 of the receptacle 2 to watertightly connect the cast iron pipe 1 and the steel pipe 3 to be connected. Further, several metal rods 8 are pushed into the rubber packing 4 at equal intervals in the radial direction and inclined downward in the axial direction. Therefore, when the rubber packing 4 is pressed and tightened by the pressing ring 6, the metal rod 8 is strongly pressed between the inclined inner surface of the socket 2 and the outer peripheral surface of the steel pipe 3, and comes to press against both surfaces. be. Therefore, what is described in the publication is cast iron pipe 1.
By fastening the socket part 2 and the pressing ring 6 with the tightening bolts 5, both ends of the metal rod 8 embedded in the rubber packing 4 are bitten into the inner surface of the socket part 2 and the surface of the steel pipe 3. Since the structure is such that the two are connected together, there is no need to roll the rubber packing 4 and the metal rod 8 onto the surface of the steel pipe 3. Therefore,
Although the above-mentioned operation is possible, it is completely impossible to use in a case where both pipe bodies are connected by a screw operation of the fastening ring.

Therefore, the two pipe bodies are brought together at the intermediate portion of the joint body, and further, a tightening ring body is provided which is screwed into the male threaded portion provided at both ends of the joint body, and a tightening ring is provided inside both ends of the joint body. In a pipe connecting device in which an elastic airtight member, a retaining ring, and an elastic member for holding a biting member are arranged in parallel between the inclined surface provided on the side surface and the inclined surface provided on the inner surface of the tightening ring body, There are technical issues that need to be solved in order to ensure sufficient pipe retention and sealing effects, and to minimize the tightening torque of the tightening ring to ensure smooth tightening operations. A problem arises, and it is an object of the present invention to solve this problem.

[Means to solve the problem]

This invention has been proposed to achieve the above object, and male threads 2, 2' are screwed on the outer periphery of both left and right ends of the joint body 1.
A tapered inclined surface a is formed at both ends of the inner circumferential surface of the joint body 1 and in the vicinity thereof so that the diameter becomes larger at a steep slope toward the outer circumferential end of the joint body 1. a male thread 2 screwed on the portion of the shaped inclined surface a and the outer periphery of both left and right ends of the joint body 1;
an inclined surface facing the opposite side that is relatively gentle compared to the degree of inclination of the inclined surface a formed on the tightening ring body 4, 4' provided with a female thread 5, 5' that is screwed into the tightening ring 2'; An annular elastic airtight member 3 made of rubber or the like, a stopper ring 11 and an elastic member 8 for holding the biting member are inserted from the front position between the part of the tapered inclined surface b having
are arranged in parallel and interposed therebetween, and when the tightening ring body 4 screws and rotates to tighten the joint body 1, the stop ring 11 is in an intermediate position, and the elastic member 8 for holding the biting member is arranged. While installing the elastic airtight member 3, the portion of the elastic airtight member 3 presses into contact with the portion of the tapered inclined surface a, and at the same time, the elastic member 8 for holding the biting member
The portion is pressed into contact with the portion of the tapered inclined surface b, and the diameter of the insertion opening of the connecting tube 6 located at the outer peripheral end of the tightening ring 4 is slightly smaller than the outer diameter of the tube 6. In a pipe connecting device in which an annular groove 9 is formed in the center position of the inner circumferential surface of the joint body 1, and an elastic member 10 having a protrusion 10' is fitted into the annular groove 9, the above-mentioned biting The member is formed of a cylindrical body 7, and the annular biting member holding elastic member 8 is provided with holding holes 8a, 8a that penetrate inward and outward in the axial center direction at a constant interval in the axially central portion. ... are opened, and the holding holes 8a, 8a... are provided so that the longitudinal direction of the cylindrical bodies 7, 7... is directed toward the axial direction, and the tightening ring bodies 4, 4' is configured so that while rolling on the surface of the tube body 6, the linear portion c in the longitudinal direction of the cylindrical bodies 7, 7... can bite into the surface of the tube body 6. It is an object of the present invention to provide a pipe connecting device characterized by the following.

[Examples and effects]

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings. For convenience of explanation, conventionally known configurations and effects will also be explained at the same time. Male threads 2, 2' are threaded on the outer periphery of both left and right ends of the joint body 1, and male screws 2, 2' are threaded on the outer periphery of both the left and right ends of the joint body 1, and at both end positions of the inner circumferential surface of the joint body 1 and near the positions, there are screw threads extending toward the outer peripheral end of the joint body 1. A tapered inclined surface a is formed so that the diameter becomes larger at a steep slope, and male screws 2 and 2' are threaded on the outer periphery of the tapered inclined surface a and the left and right ends of the joint body 1. female screw 5 screwed into the
A portion of a tapered inclined surface b having an inclined surface facing the opposite side that is relatively gentle compared to the degree of inclination of the portion of the inclined surface a formed on the tightening ring 4, 4' provided with a diameter 5'. A biting member holding elastic member 8 in which an elastic airtight member 3 such as rubber, a retaining ring 11 and a cylindrical body 7 are fitted at regular intervals from the front position is interposed in parallel between the tightening ring member and the tightening ring member. 4, the retaining ring 11 is placed in an intermediate position when the retaining ring 11 is screwed and rotated on the joint body 1, and the elastic member 8 for holding the biting member, in which the elastic airtight member 3 and the cylindrical body 7 are fitted, is disposed on both sides of the retaining ring 11. while the elastic airtight member 3 is in pressure contact with the tapered inclined surface a,
At the same time, the portion of the biting member holding elastic member 8 into which the cylindrical body 7 is fitted comes into pressure contact with the portion of the tapered inclined surface b, and the connecting tube located at the outer peripheral end of the tightening ring 4 The diameter of the insertion port 6 is made slightly larger than the outer diameter of the tube body 6, and an annular groove 9 is formed at the center of the inner peripheral surface of the joint body 1, and a protrusion 10' is formed in this annular groove 9. Surrounding elastic member 10
This is a pipe connection device fitted with a

The cylindrical body 7, which is the biting member, is fitted in the central part of the biting member holding elastic member 8 at a constant interval. Holding holes 8a, 8a, etc. are opened in the shaft center direction and penetrate inside and outside, and also,
The holding holes 8a, 8a... are provided so that the longitudinal direction of the cylindrical bodies 7, 7... faces the axial direction, and the tightening rings 4, 4' are fitted into the holding holes 8a, 8a...
The cylindrical bodies 7, 7, . . . are configured so that their linear portions c in the longitudinal direction can bite into the surface of the tube 6 while rolling on the surface of the tube 6 when tightened.

Next, the effects will be explained based on the above configuration.
Note that the effects based on conventionally known configurations will also be explained at the same time. An elastic airtight member 3 is applied to the inclined surface a formed on the inner wall at both left and right ends of the joint body 1, and is further formed on the tightening ring body 4 to the male threads 2 and 2' provided on the outer periphery of the left and right ends of the joint body 1. The female screws 5 and 5' are engaged, and the biting member holding elastic member 8 and the retaining ring 11 fitted with the cylindrical bodies 7, 7, etc. are lined up on the elastic airtight member 3, and are directed into the joint body 1. The two tube bodies 6 are inserted through both openings of the joint body 1 so as to face each other, and then the two tube bodies 6 are inserted to the position of the annular stopper elastic member 10 provided at the center of the joint body 1. , and then insert the tightening ring 4,
By rotating 4' along the male screws 2, 2', the threading of the screws progresses. And an elastic member 8 for holding the biting member into which the cylindrical bodies 7, 7... are fitted.
and the elastic airtight member 3 strongly press against and contact the inner wall inclined surfaces a and b, respectively, due to the function of the retaining ring 11 interposed between these members, so that the resistance of the portions of the inclined surfaces a and b is reduced. Then, the elastic member 8 for holding the biting member 8, which has the cylindrical body 7 fitted onto the outer peripheral surface of the tube body 6, and the elastic airtight member 3 are pressed together to generate an airtight holding force and exhibit an airtight effect. Further, the cylindrical bodies 7, 7, etc., which are fitted and held at appropriate intervals in the circumferential direction of the elastic member 8 for holding the biting member, roll when the tube body 6 moves, and roll onto the inclined surface b. As a result, it is strongly pressed and finally bites strongly into the outer peripheral surface of the tube body 6.
This prevents the tube body 6 from moving in the direction of exit.
Furthermore, the more the tube body 6 moves in the direction of withdrawal, the more the pressing force on the cylindrical bodies 7, 7, . It turns out.

In addition, even if the pipe body 6 is bent due to ground subsidence or the like, and the degree of inclination, that is, the radial angle of movement that occurs due to the bending, the biting member holding elastic member 8 and the elastic airtight member 3 absorb this. Therefore, cracks in the tube body 6 can be prevented.

In addition, in the pipe connecting device of the present invention, as a means to prevent the pipe body 6 from coming off from the connecting device, the inner wall surface of the tightening ring 4 is formed into a gentle slope b, and the portion of this tapered slope b is The cylindrical bodies 7, 7... are strongly pressed against the outer circumferential surface of the tubular body 6 to bite into them, and the cylindrical bodies 7, 7... are further held by the biting member holding elastic member 8 into which the cylindrical bodies 7, 7... are fitted. 7, 7... come into contact with the gently sloped surface of the inner wall of the ring body 4, and as the tightening ring body 4 is tightened against the joint body 1 and moves in the direction of the central axis of the tube body 6, the pipe body rolls. By pressing the outer surface of the body 6, the cylindrical bodies 7, 7, . . . bite into the outer surface of the tube body 6, which has the effect of preventing the tube body 6 from coming off from the pipe connection device.

Moreover, the joint body 1 is located at both ends of the inner circumferential surface of the joint body 1 and near the position, compared to the tapered inclined surface b formed on the tightening rings 4, 4'.
A tapered inclined surface a is formed so as to have a steep slope and a large diameter toward the outer peripheral end of the tapered surface a, and the direction of the inclined surface a and the direction of the inclined surface b are opposite to each other. By doing so, the more the tightening ring bodies 4, 4 are tightened, the more the elastic member 8 for holding the biting member 8 fitted with the elastic airtight member 3 and the cylindrical bodies 7, 7, etc. is Furthermore, since the retaining ring 11 is interposed between the elastic members 3 and 8, the pressing action is strengthened.In particular, since the slope of the inclined surface a is steep, the elastic airtight member 3 This has the effect of strongly pressing the outer surface of the surrounding tubular body 6, the side surface of the stop ring 11, and the inclined surface a, thereby ensuring a reliable sealing effect.

Also, the slope of the slope part a is made steeper than the slope of the slope part b, and in particular, compared to the steeper slope part of the slope part a, the slope of the slope part b is made relatively steeper. By making it gentle, the elastic airtight member 3 acts as a filler whose main purpose is sealing, whereas the biting member holding elastic member 8 bites the cylindrical bodies 7, 7... into the outer surface of the tube body 6. The main purpose of this filling is to provide a sealing function, and the secondary purpose is a sealing function.
This has the effect of simultaneously solving the two conditions of ensuring that the material does not come off.

As described above, the present invention uses the biting member as the cylindrical body 7.
The annular biting member holding elastic member 8 has holding holes 8a, 8 that are spaced apart from each other at a constant interval in the axially central portion and penetrate inwardly and outwardly toward the axial center.
a... is opened, and these holding holes 8a, 8a
... are provided so that the longitudinal direction of the cylindrical bodies 7, 7... is directed toward the axial direction, and when the tightening rings 4, 4' are tightened, they roll on the surface of the tube body 6. Since the cylindrical bodies 7, 7 are configured so that the linear portion c in the longitudinal direction can bite into the surface of the tube body 6 while moving, the tightening ring body 4,
When tightening the tube 4', the cylindrical bodies 7, 7, . . . also roll well on the surface of the tube 6, following the spiral rotation of the tightening rings 4, 4'. Therefore, the tightening ring 4,
Since the tightening torque of 4' is reduced, smoothness of the tightening operation can be expected, and the longitudinal straight portions of the cylindrical bodies 7, 7... bite into the surface of the tube body 6, so that the tube body This makes the prevention of falling off in step 6 effective.

[Brief explanation of the drawing]

The drawings show an embodiment of the pipe connecting device according to the present invention, and FIG. 1 is a partially cutaway side view showing the state before the tightening ring is tightened, and FIG. 2 is the state after the ring is tightened. Fig. 3 is a cross-sectional view taken along the line X-X in Fig. 2, Fig. 4 is a partially cutaway side view showing Fig. 2
-Y line sectional view, Figure 5 is a partially cutaway side view of the elastic member for holding the biting member fitted with the cylindrical body, Figure 6 is a partially notched side view of the elastic airtight member, and Figure 7 is the cylindrical body. FIG. 1... Joint body, 2, 2'... Male thread, 3...
Elastic airtight member, 4... Tightening ring, 5, 5'
... Female thread, 6 ... Tube body, 7 ... Cylindrical body, 8 ...
Elastic member for holding the biting member, 8a...Retaining hole, 9
...Annular groove, 10...Annular stopper elastic member, 10'...Protrusion, 11...Stop ring, a, b...
Inclined surface, c...straight line part.

Claims (1)

[Claims] 1 Male screws 2, 2' are screwed on the outer periphery of both left and right ends of the joint body 1, and screws are provided at both end positions of the inner circumferential surface of the joint body 1 and near the positions thereof toward the outer peripheral end of the joint body 1. A tapered inclined surface a is formed so that the diameter becomes larger at a steep slope, and a male screw 2 is threaded on the outer circumference of the tapered inclined surface a and the left and right ends of the joint body 1. 2', a tightening ring 4 provided with female threads 5, 5' that are screwed together;
Rubber or the like is inserted from the front position between the portion of the tapered inclined surface b, which has an inclined surface facing the opposite side, which is relatively gentle compared to the degree of inclination of the inclined surface a formed in the section 4'. An annular elastic airtight member 3, a stop ring 11, and a biting member holding elastic member 8 are interposed in parallel, and when the tightening ring body 4 screws and rotates to the joint body 1 and tightens, the stop ring 11 and the biting member holding elastic member 8 are interposed in parallel. With the ring 11 in the intermediate position and the elastic member 8 for holding the biting member being disposed, the portion of the elastic airtight member 3 presses into contact with the portion of the tapered inclined surface a, and at the same time, the biting member holding elastic member 8 is placed in the middle position. The portion of the elastic member 8 is pressed into contact with the portion of the tapered inclined surface b, and the diameter of the insertion opening of the connection tube 6 located at the outer peripheral end of the tightening ring 4 is adjusted to the outside of the tube 6. An annular groove 9 is formed in the center position of the inner peripheral surface of the joint body 1, and a protrusion 1 is formed in this annular groove 9.
In a pipe connecting device in which an elastic member 10 having an opening 0' is fitted, the biting member is formed of a cylindrical body 7, and the annular biting member holding elastic member 8 has an axially central portion. Holding holes 8a, 8a... are opened at regular intervals and penetrate inside and outside toward the axial center direction, and the longitudinal direction of the cylindrical bodies 7, 7... is the axis of the holding holes 8a, 8a... The cylindrical bodies 7, 7... are provided so as to be fitted in the longitudinal direction, and roll on the surface of the tube body 6 when the tightening ring bodies 4, 4' are tightened. A pipe connecting device characterized in that the straight portion c is configured to be able to bite into the surface of the pipe body 6.