JP2001173853A - Detachment preventive device for tube fitting part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and easily manufacture a detachment preventive device while certainly displaying excellent detachment preventive function and rotation preventive function by rational reconstruction against a falling-stop member. SOLUTION: A first biting projected part 8A free to bite on an outer peripheral surface 2a of an insertion tube part 2 along a direction where a component in the tube peripheral direction becomes a main body is formed on an inside surface 8b of a falling-stop member 8 provided between the outer peripheral surface 2a of the insertion tube part 2 and an inner peripheral surface of a push ring 4, and a whirling-stop member 12 furnished with a second biting projected part 12A free to bite on an outer peripheral surface 2A of the insertion tube part 2 along a direction including a component in a tube shaft center X direction is provided on the falling-stop member 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer peripheral surface of an insertion tube portion inserted and connected to a receiving tube portion, and fixedly connected to the receiving tube portion in a state of being fitted to the inserting tube portion from a tube axis direction. Between the inner peripheral surface of the pressing ring and an inner peripheral surface of the insertion tube portion, a stopper member capable of biting the outer peripheral surface of the insertion tube portion, and pressing means for pressing the stopper member against the outer peripheral surface of the insertion tube portion are provided. The present invention relates to a device for preventing detachment of a part.

[0002]

2. Description of the Related Art As shown in FIGS. 10 and 11, a detachment preventing member 50 is detachably mounted on the inner peripheral surface of the pressing ring 4 from the inside in the pipe diameter direction as shown in FIGS. A bolt 9 is formed on the outer peripheral surface of the press ring 4 by forming a concave portion 9 that can be mounted, and forming a pressing means A for applying a pressing force inward in the pipe diameter direction to the retaining member 50 in the concave portion 9. And a flat cam surface 11a formed at the tip of the bolt 11 and the inclined outer surface 50a of the retaining member 50,
The cam means B for displacing the retaining member 50 inward in the radial direction of the tube with the relative detachment movement of the receiving tube portion 1 and the insertion tube portion 2 in the tube axis X direction, and On the inner surface 50b, the outer peripheral surface 2 of the insertion tube portion 2 extends along the tube circumferential direction.
a two first biting projections 50A that can bite into a
The one formed integrally with one second biting projection 50B that can bite into the outer peripheral surface 2a of the insertion pipe part 2 along the pipe axis X direction is arranged in a substantially D-shape. It has been proposed (for example, see Japanese Patent Application Laid-Open No. 7-280147).

[0003]

In the conventional device for preventing detachment of a pipe joint, a bolt constituting the pressing means A is tightened to apply a pressing force to the retaining member 50 inward in the pipe diameter direction. The first biting projection 50A and the second biting projection 50B formed on the inner surface of the retaining member 50 are
Not only can it exert a detachment preventing function of preventing the relative movement of the connected receiving tube portion 1 and insertion tube portion 2 in the direction of the tube axis X by biting into the outer peripheral surface 2a of the receiving portion. Since a rotation preventing function for preventing relative rotation between the pipe portion 1 and the insertion pipe portion 2 can also be exerted, in particular, devices such as an air valve and a fire hydrant are connected in the middle of the piping system. Even when it is necessary to maintain a specific posture, special support work for preventing rotation for maintaining the specific posture of the device is unnecessary, and the cost of pipe connection work can be reduced. However, conventionally, since the first biting projection 50A and the second biting projection 50B having different directions are formed on the inner surface of the retaining member 50, for example, the retaining member manufactured by casting is used. When the first biting projection 50A and the second biting projection 50B are cut, it is easy to take time, and in particular, the first biting projection 50A and the second biting projection 50B are easily cut.
When the biting projection 50B is continuous or close, there is a problem that much labor is required for cutting.

[0004] The present invention has been made in view of the above-mentioned situation, and its main problem is to use a reasonable modification to the retaining member to ensure that the excellent detachment prevention function and rotation prevention function can be fully exhibited. An object of the present invention is to provide a pipe joint detachment prevention device which can be manufactured efficiently and easily.

[0005]

According to a first aspect of the present invention, there is provided a fuel cell system comprising: an outer peripheral surface of an insertion tube portion inserted and connected to a reception tube portion; Between the inner peripheral surface of the pressing ring fixedly connected to the tube portion from the tube axis direction, a stopper member capable of biting into the outer peripheral surface of the insertion tube portion is provided, and the stopper member is pressed against the outer peripheral surface of the insertion tube portion. A device for preventing disengagement of a pipe joint portion provided with a pressing means, wherein an inner surface of the retaining member can bite into an outer peripheral surface of the insertion pipe portion along a direction in which a component in a pipe circumferential direction is mainly used. A detent having a first biting projection and a second biting projection on the retaining member that can bite into the outer peripheral surface of the insertion tube along a direction including a component in the tube axis direction. The point is that a member is provided.

According to the above-mentioned feature, when the retaining member is pressed against the outer peripheral surface of the insertion tube by the pressing means, the first
The biting projection and the second biting projection bite into the outer peripheral surface of the insertion tube portion, and the second biting projection extends along the direction in which the component in the tube circumferential direction becomes main.
1 With the biting projection, it is possible to exhibit a detachment prevention function that prevents relative movement in the tube axis direction between the connected receiving tube portion and insertion tube portion, and includes a component in the tube axis direction. With the second biting projections along the direction, a rotation preventing function for preventing relative rotation between the receiving tube portion and the insertion tube portion can be exhibited. Moreover, since the first biting projection is formed on the inner surface of the retaining member and the second biting projection is formed on the rotation preventing member provided on the retaining member, one of the first biting projections is formed. The projection or the second biting projection does not hinder the processing of the other second biting projection or the first biting projection. Therefore, with a simple and inexpensive remodeling in which a detent member having the second biting projection is provided on the detent member, it can be efficiently and easily manufactured while reliably exhibiting excellent separation prevention function and rotation prevention function. be able to.

A feature of the device for preventing a pipe joint from being detached according to a second aspect of the present invention is that the rotation preventing member is configured to be detachable from the retaining member. According to the above-mentioned characteristic configuration, when devices such as an air valve and a fire hydrant are connected in the middle of the piping system, and when it is necessary to maintain those devices in a specific posture, a first biting projection is provided. By attaching a rotation preventing member having a second biting projection to the retaining member, both the relative disengagement movement and the relative rotation of the connected receiving tube portion and insertion tube portion in the tube axis direction are prevented. hand,
The device can be maintained in a specific position. In the case of a piping system buried underground or the like, and in the case where an external force in the circumferential direction of the pipe such as a rotational force or a torsion force acts due to uneven settlement or an earthquake, a first biting projection is provided. Second from the retaining member
By removing the detent member provided with the biting projection, while preventing the relative detachment movement of the connected receiving tube portion and the insertion tube portion, the relative rotation of the receiving tube portion and the insertion tube portion allows the removal. External force in the circumferential direction of the tube can be absorbed. Therefore,
A device having a detachment preventing function and a rotation preventing function by a simple operation of only attaching and detaching the rotation preventing member having the second biting projection to and from the retaining member having the first biting projection. And a device having only a detachment prevention function.

According to a third aspect of the present invention, there is provided a device for preventing a pipe joint from being detached, wherein the protrusion of the second biting projection from the inner surface of the retaining member is provided between the retaining member and the rotation preventing member. In that an adjusting means for adjusting the distance is provided. According to the above-mentioned characteristic configuration, the amount of protrusion of the second biting projection from the inner surface of the retaining member can be freely adjusted by the adjusting means provided between the retaining member and the rotation preventing member. It is possible to obtain an anti-rotation force according to conditions such as the material of the insertion tube portion and the retaining member and the shape of each biting projection.

According to a fourth aspect of the present invention, there is provided a device for preventing a pipe joint from being detached, wherein the second biting projection extends along a direction including a component in a pipe axis direction and a component in a pipe circumferential direction. The point is that it is formed in an annular shape. According to the above feature configuration,
Not only can the detachment preventing function and the rotation preventing function be exerted by the second biting projection, but also the cutting of the second biting projection can be performed efficiently and easily.

According to a fifth aspect of the present invention, there is provided a pipe joint detachment preventing device, wherein the adjusting means is formed on a female screw of a mounting hole formed through the retaining member and an outer peripheral surface of the rotation preventing member. In that it consists of a male screw. According to the above-mentioned characteristic configuration, the adjusting means can be advantageously manufactured in terms of manufacturing cost by using the screw for detachably attaching the rotation preventing member to the retaining member.

According to a sixth aspect of the present invention, there is provided a device for preventing a pipe joint from being detached, wherein a retaining member is detachably attached to a plurality of locations on an inner peripheral surface of the press ring and at predetermined intervals in a pipe circumferential direction. The present invention is characterized in that a concave portion to be mounted on the concave portion is formed, and at least one of the retaining members mounted on the concave portion is provided with the rotation preventing member. According to the above-mentioned characteristic configuration, as a retaining member to be mounted in the plurality of recesses of the pressing wheel, a member provided with a rotation preventing member and a member not provided with a rotation preventing member can be appropriately selected. It can be easily changed to the most appropriate separation prevention force and rotation prevention force according to the use conditions.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIGS.
FIG. 3 shows a device for preventing a detachment of a pipe joint of a fluid transport pipe (for example, a water pipe or a gas pipe), and an insertion pipe section of another fluid transport pipe P inserted and connected to a receiving pipe section 1 of one fluid transport pipe P; A sealing material 3 made of synthetic rubber (for example, styrene-butadiene rubber) capable of sealing between an inner peripheral surface 1c of the receiving tube portion 1 and an outer peripheral surface 2a of the insertion tube portion 2; A press ring 4 made of cast iron that can be pressed to a sealed state (watertight state) by pressing the ring from the pipe axis X direction is externally provided, and the press ring 4 and the receiving pipe 1 are connected in the pipe axis X direction. A fastening means 5 for tightening and fixing is provided.

The fastening means 5 includes a plurality of bolt insertion holes 1b formed at a plurality of positions in the circumferential direction of the connecting flange portion 1a of the receiving tube portion 1, and a plurality of bolt inserting holes 1b of the first connecting flange portion 4a of the pressing ring 4 in the circumferential direction. Of the bolt insertion hole 4b formed in
It is composed of a T-shaped bolt 5A inserted across the bolt insertion holes 1b and 4b opposed to each other in the tube axis direction, and a nut 5B screwed to a protruding screw portion of the bolt 5A. The push ring 4 is formed at one end of the push ring 4 in the tube axis X direction by a relative approach movement in the direction of the tube axis X between the push ring 4 and the receiving pipe section 1 due to the tightening operation of the bolts 5A and the nuts 5B. The seal material 3 is compressed and deformed by the seal pressing portion 4c,
Between the inner peripheral surface 1c and the outer peripheral surface 2a of the insertion tube portion 2.

The pressing ring 4 is composed of a pair of divided pressing ring bodies 4A which are divided into two in the circumferential direction of the pipe. Bolts 6 and nuts 7 are fastened to both ends of the split pressing ring bodies 4A in the circumferential direction of the pipe. A second connecting flange portion 4d for fixed connection with each other via means is integrally formed, and an outer circumferential surface 2a of the insertion pipe portion 2 is provided at a plurality of locations on the inner circumferential surface of each split pressing body 4A in the circumferential direction of the tube. A recess 9 is formed in which a retaining member 8 capable of biting into the tube is movably mounted in the radial direction of the tube.
a cam means B for displacing the retaining member 8 inward in the radial direction of the pipe as the receiving pipe part 1 and the insertion pipe part 2 move away from each other in the pipe axis X direction. Are provided.

The pressing means A has a screw hole 10 formed at a position corresponding to each concave portion 9 of the split pressing body 4A so as to penetrate in a direction perpendicular to the outer surface 8a of the retaining member 8 mounted in the concave portion 9. At the same time, each screw hole 10 has a recess 9
A push bolt 11 that presses the outer surface 8a of the retaining member 8 mounted inside to the inside in the pipe radial direction is detachably screwed.

The outer side surface 8a of the retaining member 8 is formed as a tapered inclined surface which is separated from the outer peripheral surface 2a of the insertion tube portion 2 toward the distal end side of the insertion tube portion 2. The tip surface 11a is formed as a flat cam surface parallel or almost parallel to the inclined outer surface 8a of the retaining member 8, and the inclined outer surface 8a of the retaining member 8 and the push bolt 11 are formed.
With the cam surface 11a, the cam means B for moving the retaining member 8 further to the biting side with the relative detachment movement in the pipe axis X direction between the receiving pipe section 1 and the insertion pipe section 2 is provided. It is configured.

Then, on the inner surface 8b of the retaining member 8,
In addition, a first biting projection 8A that can bite into the outer peripheral surface 2a of the insertion pipe portion 2 along the pipe circumferential direction is integrally formed near both ends in the pipe axis X direction. The member 8 is made of a columnar metal integrally formed with a second biting projection 12A that can bite into the outer peripheral surface 2a of the insertion pipe 2 along a direction including at least a component in the pipe axis X direction. (For example, chrome molybdenum steel)
Is provided so as to be detachable. Further, between the retaining member 8 and the rotation preventing member 12, there is provided an adjusting means C for adjusting a protrusion allowance of the second biting projection 12 from the inner side surface 8b of the retaining member 8. Is provided.

The cross-sectional shape of the first biting projection 8A,
And, the cross section of the second biting projection 12A is
In addition to being formed in a sharp triangular shape, the second biting projection 12A is formed in an annular shape along a direction including a component in the pipe axis X direction and a component in the pipe circumferential direction.

The adjusting means C includes a female screw 8 c having a mounting hole formed through the retaining member 8 along the bolt axis direction of the push bolt 11, and a male screw 12 a formed on the outer peripheral surface of the rotation preventing member 12. When the male screw 12a of the rotation stopper 12 is screwed into the female screw 8c of the retaining member 8, the second thread from the inner surface 8b of the retaining member 8 is formed.
The protrusion allowance of the biting projection 12 can be adjusted. The other end of the rotation stopper 12 is provided with the rotation stopper 1.
Hexagonal operation hole 12b for rotating operation of 2 with a tool
Are formed.

The retaining members 8 are engaged with the locking holes 15 formed in the side walls of the corresponding recesses 9 from the peripheral direction of the tube on both side surfaces of the retaining members 8 in the peripheral direction of the tube. A mounting hole 17 for a temporary fixing member 16 made of rubber or synthetic resin for temporarily fixing and holding the predetermined position in the concave portion 9 is formed.

The temporary fixing member 16 is inserted when the retaining member 8 in the concave portion 9 is pressed inward in the radial direction of the tube by the screwing operation of the push bolt 11, or when the receiving tube 1 is inserted. When a pressing force to the biting side is applied to the retaining member 8 with the relative detachment movement in the pipe axis X direction from the pipe portion 2, the retaining member 8 is forcibly moved inward in the pipe radial direction. It is configured to allow.

When the retaining member 8 mounted in the recess 9 is pressed against the outer peripheral surface 2a of the insertion tube portion 2 by a screwing operation of the pressing means A onto the tightening side of the push bolt 11,
Both first biting projections 8A formed integrally with the retaining member 8;
And a second member formed integrally with the tip of the rotation preventing member 12.
The biting projection 12A bites into the outer peripheral surface 2a of the insertion tube portion 2 and is long along the pipe circumferential direction (or long along the direction in which the component in the pipe circumferential direction is main). And the tube axis X of the connected receiving tube portion 1 and insertion tube portion 2
A second function of preventing the relative movement in the direction can be exhibited, and the second function is long at least along the direction including the component in the tube axis X direction (or is long only along the tube axis X direction). With the biting projection 12A, a rotation preventing function for preventing relative rotation between the receiving tube 1 and the insertion tube 2 can also be exhibited.

As shown in FIG. 7, if devices such as an air valve 20 and a fire hydrant are connected in the middle of the piping system and it is necessary to maintain those devices in a specific posture,
1 By attaching the detent member 12 provided with the second biting projection 12A to the retaining member 8 provided with the biting projection 8A, the stopper tube 12 of the fluid transport pipe P connected to one of the fluid transport pipes P is connected. Both the relative disengagement movement and the relative rotation of the other fluid transport pipe P with respect to the insertion pipe portion 2 in the pipe axis X direction are prevented, and the apparatus can be maintained in a specific posture.

In the case of a piping system buried underground or the like and where external forces in the circumferential direction of the pipe, such as a rotational force or a torsion force, are applied due to uneven settlement or an earthquake, etc. By removing the anti-rotation member 12 having the second biting projection 12A from the retaining member 8 having the portion 8A, the receiving pipe portion 1 of one fluid transport pipe P and the other fluid transport pipe which are connected to each other are connected. It is possible to absorb external force in the circumferential direction of the pipe by the relative rotation of the receiving pipe 1 and the insertion pipe 2 while reliably preventing the relative detachment movement of the P from the insertion pipe 2.

Therefore, with a simple operation of simply attaching and detaching the rotation preventing member 12 having the second biting projection 12A to and from the retaining member 8 having the first biting projection 8A,
It can be selectively used for those having the detachment prevention function and the rotation prevention function, and those having only the detachment prevention function.

In addition, it is not necessary to provide a rotation preventing member 12 for all of the retaining members 8 held in the respective concave portions 9 of the pressing wheel 4, and at least one of the retaining members 8 may be provided with the rotating preventing member 12. I just need.

Further, as the retaining member 8 to be mounted in the plurality of recesses 9 of the pressing wheel 4, a member provided with the rotation preventing member 12 and a member not provided with the rotation preventing member 12 are appropriately selected. Therefore, it is possible to easily change to the most appropriate separation prevention force and rotation prevention force according to the use conditions.

[Second Embodiment] In the above-described first embodiment, the rotation preventing member 12 having the second biting projection 12A is different from the retaining member 8 having the first biting projection 8A.
Is detachably screwed, and the second biting projection 1 is
2A is formed in an annular shape along a direction including a component in the pipe axis X direction and a component in the pipe circumferential direction. However, as shown in FIGS. 8 and 9, the first biting projection 8A is provided. Retaining member 8
A non-rotatable prismatic detent member 12 having a linear second biting projection 12A that can bite into the outer peripheral surface 2a of the insertion pipe portion 2 along the pipe axis X direction. The first mounting hole 8d having a rectangular shape to be fitted and held and the second biting projection 12A fitted and held in the first mounting hole 8d are secured to the retaining member 8.
May be formed so as to communicate with the second mounting hole 8e for mounting the bolt 21 to be tightened and fixed from the outside in the pipe diameter direction.
Since other configurations are the same as those described in the first embodiment, the same components are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.

[Other Embodiments] (1) In each of the above-described embodiments, the retaining member 8 is connected to the receiving tube 1 and the insertion tube 2 as the tube moves relative to each other in the direction of the tube axis X. Although the cam means B for displacing radially inward is provided,
The technique of the present invention may be applied to such a pipe joint detachment prevention device that does not include the cam means B. That is, even if the technology of the present invention is applied to a pipe joint detachment prevention device including only a pressing means A that presses the retaining member 8 mounted in each of the concave portions 9 against the outer peripheral surface 2a of the insertion pipe portion 2. Good.

(2) In each of the above-described embodiments, the first biting projection 8A of the retaining member 8 is formed long along the pipe circumferential direction. May be formed long along the direction intersecting with. in short,
The first biting projection 8A of the retaining member 8 may be either continuous or intermittent, but it is only necessary that the first biting projection 8A be long along the direction in which the component in the circumferential direction of the tube is the main component. Further, the number of the first biting projections 8A is one,
The number may be two as in the above embodiment, or may be three.

(3) In the above-described first embodiment, the second biting projection 12A is formed in an annular shape along a direction including a component in the pipe axis X direction and a component in the pipe circumferential direction. Also, the second
In the embodiment, the second biting projection 12A is connected to the pipe axis X
Although formed linearly along the direction, the second biting projection 12A may be formed linearly or curved along a direction intersecting the tube axis X direction. In short, the second biting projection 12A may be either continuous or intermittent, but as long as it is long along the direction including at least the component in the tube axis X direction.

(4) The first biting projection 8A and the second
The tip of each of the biting projections 12A may be formed in a waveform, or may be formed in an inclined shape or the like in which the amount of protrusion increases toward one end in the longitudinal direction.

(5) When the rotation preventing member 12 provided with the second biting projection 12A is detachably attached to the retaining member 8 provided with the first biting projection 8A, each of the above-described embodiments is performed. In the example, the screw system is adopted, but instead of such a screw system, a detachable structure may be adopted by a fitting system.

(6) After the retaining member 8 having the first biting projection 8A and the detent member 12 having the second biting projection 12A are separately manufactured, the detent member 12 is retained. It may be carried out by being fixed to the member 8 by a fixing means as appropriate.

[Brief description of the drawings]

FIG. 1 is a cross-sectional side view of a pipe joint detachment prevention device according to a first embodiment of the present invention.

FIG. 2 is a sectional front view.

FIG. 3 is an enlarged partial cutaway front view of a main part.

FIG. 4 is an enlarged sectional side view of a main part.

FIG. 5 is an enlarged exploded perspective view of a retaining member and a rotation preventing member.

FIG. 6 is an enlarged inner side view of the retaining member and the rotation preventing member.

FIG. 7 is a side view showing an example of a piping system.

FIG. 8 is an enlarged partially cutaway front view of a pipe joint detachment prevention device showing a second embodiment of the present invention.

FIG. 9 is an enlarged inner side view of the retaining member and the rotation preventing member.

FIG. 10 is a cross-sectional side view showing a conventional pipe joint detachment prevention device.

FIG. 11 is a perspective view of a retaining member.

[Explanation of symbols]

 Reference Signs List A Pressing means C Adjusting means X Tube axis 1 Receiving pipe part 2 Inserting pipe part 2a Outer peripheral surface 4 Pressing ring 8 Detachment member 8A First biting projection part 8c Female screw 12 Detenting member 12A Second biting projection part 12a Male screw

Claims (6)

[Claims] 1. An outer peripheral surface of an insertion tube portion inserted and connected to a receiving tube portion, and an inner periphery of a press wheel fixedly connected to the receiving tube portion in a state of being fitted to the insertion tube portion from a tube axis direction. Between the surface and the outer surface of the insertion pipe portion, a stopper member capable of biting into the outer peripheral surface of the insertion tube portion, and a pressing means for pressing the stopper member against the outer peripheral surface of the insertion tube portion are provided. A first biting projection that can bite into the outer peripheral surface of the insertion tube portion along the direction in which the component in the pipe circumferential direction is mainly formed on the inner surface of the retaining member, and the retaining member has A device for preventing detachment of a pipe joint part provided with a detent member provided with a second biting projection that can bite into an outer peripheral surface of the insertion pipe part along a direction including a component in a pipe axis direction. 2. The detachment prevention device for a pipe joint according to claim 1, wherein the rotation preventing member is configured to be detachable from the retaining member. 3. Between the retaining member and the rotation preventing member,
The detachment prevention device for a pipe joint according to claim 1 or 2, further comprising an adjusting means for adjusting a protrusion of the second biting projection from the inner surface of the retaining member. 4. The pipe according to claim 1, wherein the second biting projection is formed in an annular shape along a direction including a component in a pipe axis direction and a component in a pipe circumferential direction. Detachment prevention device for joints. 5. The pipe joint according to claim 3, wherein said adjusting means comprises a female screw of a mounting hole formed through the retaining member and a male screw formed on the outer peripheral surface of the rotation preventing member. Detachment prevention device. 6. A retaining member for detachably mounting a retaining member at a plurality of locations on an inner peripheral surface of the pressing ring and at predetermined intervals in a pipe circumferential direction, and a retaining member attached to the concave portion. The detachment prevention device for a pipe joint according to any one of claims 1 to 5, wherein at least one of the first and second members is provided with the rotation preventing member.