JP2003176888A - Insertion type tube fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insertion type tube fitting capable of certainly sealing and attaching a bellows pipe only by pressing a nut member. <P>SOLUTION: The insertion type tube fitting 16 for connecting the bellows pipe F is provided with a coupling body 26 of which an inner wall is stepped; a ring-like nut member 30 longitudinally slidably mounted to a tip end of the coupling body; a packing member 42 provided on the stepped part of the inner wall surface of the coupling body; a ring-like stopper member 44 butted to a tip end of the bellows pipe when the bellows pipe is inserted and inwardly inserting the bellows pipe while it is elastically expanded/contracted in a radial direction of the bellows pipe; a ring-like retainer 50 which presses the packing member upon insertion of the nut member and of which one end side can be elastically expanded/contracted in a center direction of the bellows pipe; and a stop ring member 40 for fixing the nut member when the nut member is inserted into the coupling body side. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plug-in type pipe joint having a good sealability, and mainly by inserting a bellows tube into the joint body and further pushing a nut member, a good sealability and a disconnection can be obtained. The present invention relates to a plug-in type pipe joint that can be stopped.

[0002]

2. Description of the Related Art Generally, as a plug-in type pipe joint for connecting a flexible pipe through which a fluid such as gas flows, a joint disclosed in, for example, Utility Model Publication No. 2565469 is known. FIG. 25 is a cross-sectional view showing the pipe joint disclosed in the above publication, and as shown in the drawing, this pipe joint has a socket 4 formed with a connection hole 2 into which a flexible bellows pipe F is inserted. A tightening member 6 screwed into the open end of the socket 4, and a substantially C-shaped member mounted between both ends of the socket 4 and the tightening member 6 for positioning the tightening member 6 at an initial screwing position. The positioning member 8, a plurality of retainers 10 radially arranged inside the connection hole 2 of the socket 4, the inner peripheral surface of which is formed in an uneven shape corresponding to the outer peripheral surface of the bellows tube F, and the plurality of retainers 10. The retainer 10 is provided with a holding member 12 that elastically holds the retainer 10 such that the inner diameter of the retainer 10 is enlarged or reduced. Then, after inserting the bellows tube F between the plurality of retainers 10, the positioning member 8 is removed and the tightening member 6 is screwed and tightened, thereby pressing the retainer 10 toward the bottom side of the connection hole 2 and the bellows. The tube F is fixed to the socket 4.

[0003]

By the way, in the above-mentioned conventional pipe joint, after inserting the bellows pipe F into the connection hole 2,
After removing the positioning member 8, the tightening member 6 is attached to the socket 4
This is done by using a tool not shown when tightening. Therefore, there is still a work of tightening with a tool, and therefore, there is a problem that, for example, after inserting the bellows tube F, the tightening may be forgotten and a leak may occur. In addition, it takes time to remove the positioning member, and the connection cannot be easily performed. Further, an elastic holding member for holding a plurality of retainers is required, and the structure is complicated.

[0004] Therefore, the applicant of the present invention is
No. 1-316155), a plug-in type pipe joint which can be connected simply by inserting a bellows pipe is disclosed. However, in the case of this pipe joint, although it has an advantage that it can be connected only by inserting it, it has an improvement in that the structure is slightly complicated because a spring or the like is provided inside. Further, as another conventional pipe joint, Japanese Patent Laid-Open No.
-164280, JP-A-5-31289, JP-A-6-58474 and JP-A-6-584.
Those disclosed in Japanese Patent No. 75, etc. are also known. In the pipe joints shown in each of these publicly known examples, all use ring springs that are ring-shaped and whose diameters are elastically expandable and contractable, and are fitted in the recesses of the bellows pipe to lock them. By doing so, the bellows tube is prevented from falling off and falling off.

However, in this case, since the ring spring has a structure in which it is mounted in the pipe joint in the expanded state, a member for maintaining the expanded state is required, and the number of parts is reduced. There was a problem of increasing. Further, the present applicant has proposed a plug-in type pipe joint that solves the above problems in Japanese Patent Application No. 2001-220433, but further improvements have been found by the subsequent research. The present invention has been made to pay attention to the above problems and to solve them effectively. An object of the present invention is to provide a plug-in type pipe joint which can be securely sealed and installed by inserting a bellows pipe into the joint body and further pushing a nut member, and which has a simple structure and is safe. It is a thing.

[0006]

According to a first aspect of the present invention, there is provided a plug-in type pipe joint for connecting a bellows pipe having a corrugated portion whose outer peripheral surface has a corrugated shape, for inserting the bellows pipe. A joint body in which a pipe insertion hole is formed and the inner wall surface is stepped, a ring-shaped nut member slidably attached to the tip of the joint body in the longitudinal direction thereof, and an inner wall surface of the joint body And a packing member provided on the stepped portion of the packing member, and the packing member provided on the base end side of the packing member and abutting against the tip of the bellows tube when the bellows tube is inserted, and a part of the packing member in the radial direction of the bellows tube. A ring-shaped stopper member that elastically expands and contracts to insert the bellows tube inward, and is interposed between the nut member and the packing member to press the packing member when inserting the nut member and Side is the bellows A ring-shaped retainer member that is elastically expandable / contractible in the direction of the center, and a stop ring member that is provided on the nut member and fixes the nut member when the nut member is inserted into the joint body side. The nut member is a plug-in type pipe joint characterized in that when the nut member is inserted into the joint body, the nut member comes into contact with the retainer member and deforms the retainer member in the diameter reducing direction.

According to this, when the bellows tube is inserted into the joint body, the bellows tube is inserted through the ring-shaped retainer member and the packing member, and the tip thereof comes into contact with the stopper member to make the diameter of the stopper member smaller. While expanding or contracting, one or more threads are inserted, and the inner peripheral end of the stopper member is fitted into the concave portion of the bellows tube. When the nut member is further pushed in this state, the tip comes into contact with the retainer member. The diameter of the retainer member is reduced so that one end of the retainer member is fitted into the recess of the bellows tube, and the nut member is fixed to the joint body side by the stop ring member. In this state, when a force is applied to the bellows tube in the pull-out direction, the stopper member and the packing member integrally move slightly in the pull-out direction to give a force to move the retainer member in the pull-out direction, or the retainer member Since one end is fitted in the recess of the bellows tube, a force for moving the retainer member in the pull-out direction is applied,
At this time, the retainer member that is in contact with the nut member acts so as to reduce the diameter of the retainer member and prevent the withdrawal of the bellows tube.Therefore, insert the bellows tube by fully inserting it into the joint body. It is possible to connect the bellows tube while maintaining a good sealing property simply by pushing in the nut member. Therefore, the connecting operation of the bellows pipe can be easily and surely performed without making the structure of the plug-in type pipe joint so complicated.

In this case, for example, as defined in claim 2, the retainer member has a cylindrical front brim portion which is slidably contacted with the inner wall of the nut portion, and the retainer member is in a state in which the retainer member is expanded to the outside when no load is applied. It consists of a thick rear protrusion. Further, for example, as defined in claim 3, on the inner surface side of the rear protrusion,
An expanding taper surface that contacts the bellows tube when the diameter is reduced is formed, and a diameter-decreasing taper surface that contacts the nut member is formed on the outer surface side. Further, for example, as defined in claim 4, a plurality of rear projections and the front brim are formed so as to be cut in the lengthwise direction while leaving a part of the end of the front brim. A notch groove is provided.

Further, for example, as defined in claim 5,
The stopper member is provided with a ring portion fixed to the joint body side, and a plurality of engagement pieces provided inside the ring portion and elastically deformed by contacting an outer peripheral surface of the inserted bellows tube. And consists of. Further, for example, as defined in claim 6, the nut member is provided with a spacer member that is detachable in order to prevent the nut member from being inserted more than a predetermined amount when inserted into the joint body, On the inner wall of the joint body, a diameter expansion for allowing the diameter expansion of the stop ring member to release the engagement between the nut member and the joint body when the nut member is inserted with the spacer member removed. A step is formed. According to this, in the case of disassembling the plug-in type pipe joint once assembled for re-execution, by removing the spacer member from the nut member and further pushing this nut member into the joint body side, The internal stop ring member fits into the diameter-expanded step portion and expands in diameter itself, whereby the engagement between the nut member and the joint body can be released.

Further, for example, as defined in claim 7,
The packing member includes a fireproof packing that expands due to high temperature and an airtight packing that has airtightness, and an annular expansion stop ring is provided between the fireproof packing and the airtight packing, and an inner wall of the joint body. A movement blocking step portion is formed on the base plate for blocking the movement of the expansion stop ring during expansion of the refractory packing. According to this, when the packing member is exposed to a high temperature such as in the case of fire, this part of the fireproof packing expands, but at this time, due to the action of the annular expansion stop ring fixed by the movement prevention step portion. , The fireproof packing can prevent the gap between the bellows pipe and the plug-in type pipe joint from expanding randomly, and it can be concentrated in one place, which maintains a high sealing property even in the event of a fire. It becomes possible to do.

Further, for example, as defined in claim 8,
The expansion stop ring has an L-shaped cross section. According to this, since the expansion stop ring has an L-shaped cross section, when the fireproof packing expands like a fire, it can be prevented from leaking to the outside, so that the sealability of the fireproof packing at the time of fire is further improved. Can be improved.

Further, for example, as defined in claim 9,
When the nut member is inserted, the one end surface of the packing member is brought into contact with the tip end of the nut member or the rear end of the retainer member to press the packing member and contact the nut member in a pressed state. Alternatively, a ring-shaped packing pressing member that is in a state of being in close proximity is provided.
According to this, when a force is applied to the bellows tube in the pulling-out direction after the bellows tube is assembled, the packing pressing member acts on the nut member even if the retainer member moves to some extent in the pulling-out direction. Since the packing pressing member hardly abuts and the packing member is pressed and maintained in a compressed state, the sealing property is not deteriorated and the high sealing property can be maintained. Become.

Further, for example, as defined in claim 10, when the nut member is inserted into one end surface of the packing member, the packing member comes into contact with the tip end of the nut member or the rear end of the retainer member. An elastic packing pressing member that reduces the diameter of the packing member while pressing the packing member is provided, and the inner wall of the joint body has a taper surface for reducing the diameter of the elastic packing pressing member, and the packing member is pressed. A pressing member fixing groove for expanding and fixing the elastic packing pressing member in the state is provided. According to this, when the nut member is pushed in, the elastic packing pressing member is fitted and fixed in the pressing member fixing groove in a state where the packing member is pressed and compressed. Even when a force is applied in the pulling direction, the action of the elastic packing pressing member keeps the packing member pressed and compressed, so that the sealing property does not deteriorate and the high sealing property is maintained. It becomes possible to do.

Further, for example, as defined in claim 11, the packing member is composed of a fireproof packing which expands at high temperature and an airtight packing having airtightness, and a circle is provided between the fireproof packing and the airtight packing. An annular expansion stop ring is provided, an inner diameter of the joint body is provided with a radially expanded elastic packing pressing member that is compressed in a diameter reducing direction, and an inner wall of the joint body is pressed with the packing member. A diametrical expansion pressing member fixing groove for expanding and fixing the diametrical expansion elastic packing pressing member in a state is provided. According to this, when the nut member is pushed in,
Since the expanded-diameter elastic packing pressing member is fitted and fixed in the expanded-diameter pressing member fixing groove in a state where the packing member is pressed and compressed, a force is applied to the bellows tube in the pulling-out direction after the assembly of the bellows tube is completed. Even in the case, since the packing member is kept pressed and compressed by the action of the expanded diameter elastic packing pressing member, it is possible to maintain the high sealing property without deteriorating the sealing property. .

Further, as defined in, for example, claim 12, the end portion of the nut member is formed with a slip-out preventing taper surface. Further, for example, as defined in claim 13, the nut member includes a head portion having a large outer diameter and a sliding portion having an outer diameter smaller than that of the head portion and being substantially inserted into the joint body. The erroneous insertion preventing collar member having a predetermined width and detachable is interposed between the head portion and the tip portion of the joint body. According to this, since the erroneous insertion preventing collar member is detachably mounted between the head portion of the nut member and the tip portion of the joint body, the nut member is erroneously attached to the inside of the joint body except at the time of construction. It is possible to prevent it from being pushed into.

Further, for example, as defined in claim 14, the erroneous insertion preventing collar member is a collar body made of a substantially ring-shaped elastic material in which a circular ring is partially cut out. It comprises a handle attached to the collar body. Further, for example, as defined in claim 15, when the sliding portion is inserted into the joint body, the head portion is provided between the head portion and the tip portion of the joint body. A disassembly ring member having a minute width and easily cut so as to be separated from the tip of the main body by a slight distance is provided, and the disassembly ring member is disassembled on the inner peripheral surface of the joint main body at the time of disassembly. A disassembled enlarged diameter stepped portion is formed for dropping the stop ring member when the ring member is removed and the nut member is further inserted into the joint body. According to this, when disassembling the plug-in type pipe joint for reconstructing the house or the like, it is interposed between the head portion of the nut member and the tip portion of the joint body. By cutting and removing the disassembly ring member, the nut member can be further pushed into the joint body side by a length corresponding to the width of the disassembly ring member,
And if this further pushing is performed, the stop ring member will be dropped into the disassembly step,
The locked state between the joint body and the nut member is released, and as a result, the nut member can be retracted in the pull-out direction, so that the bellows tube can also be pulled out.

In this case, for example, as defined in claim 16, a part of the disassembling ring member is formed with a thin portion having a small thickness for easy cutting. Further, for example, as defined in claim 17, a pulling ear portion for pulling when removing the disassembling ring member is formed in a part of the disassembling ring member. In addition, for example, as defined in claim 18, a disengagement prevention engaging portion that engages with the packing member and prevents disengagement of the packing member is formed on an inner wall of the joint body. According to this, when the tip reaches the packing member in the process of inserting the bellows tube, when the bellows tube is pulled out in the middle of insertion for confirmation for confirmation, the packing member is caught by the slip-out preventing engagement portion. The packing member can be prevented from moving in the removing direction, and as a result, only the bellows tube can be pulled out alone.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a plug-in type pipe joint according to the present invention will be described in detail below with reference to the accompanying drawings. <First Embodiment> First, a first embodiment of the present invention will be described. 1 is a sectional view showing a plug-in type pipe joint and a bellows pipe according to a first embodiment of the present invention, FIG. 2 is a perspective view showing a C-shaped stop ring member, and FIG. 3 is a perspective view showing a ring-shaped stopper member. FIG. 4, FIG. 4 is a diagram showing a stopper member, FIG. 5 is a perspective view showing a retainer member, FIG. 6 is a diagram for explaining the operation of the retainer member, and FIG. 7 is a diagram showing the plug-in type pipe joint of the first embodiment of the present invention. It is a flowchart showing a process of inserting a bellows tube. As shown,
The plug-in type pipe joint 16 is for connecting a flexible bellows pipe F made of, for example, stainless steel,
The outer peripheral surface of the bellows tube F has a wave-like concave portion 18 and convex portion 20.
Is formed and is covered with a coating layer 22 made of a soft resin such as soft vinyl chloride except for the connected tip portion.

The plug-in type pipe joint 16 has a stepped inner wall surface for inserting the bellows pipe F and has a pipe insertion hole 24.
And a ring-shaped nut member 30 having a tube insertion hole 28 formed in the center thereof. The nut member 30 is formed of brass or the like in a ring shape, and has a tube insertion hole 28 having a size capable of inserting the bellows tube F at the center. The nut member 30 has a head portion 30A having a large outer diameter, and a sliding portion 30B having an outer diameter smaller than that of the head portion 30A and being inserted into the joint body 26 in a substantially sliding state.
And consists of. The outer surface of the head portion 30A of the nut member 30 is, for example, cylindrical or hexagonal. The sliding portion 30B, which is the base end side of the nut member 30, is slidably fitted to the distal end of the joint body 24 along the longitudinal direction thereof, and the joining step portion of the outer peripheral surface has a circular shape. A watertight O-ring 34 made of a ring-shaped elastic body is interposed to prevent water from entering the inside.

A watertight packing 36 made of a circular ring-shaped elastic body is mounted along the circumferential direction on the inner peripheral surface of the nut member 30 on the tip side, and the inner projection 36A of the watertight packing 36 is provided. Covering layer 2 of the inserted bellows tube F
It seals in close contact with No. 2 to prevent corrosive water and the like from entering the pipe joint from the outside. A ring-shaped groove 38 having a rectangular cross section is formed on the outer peripheral surface of the nut member 30 on the base end side, and a part of the ring as shown in FIG. 2 is cut out in the groove 38. A C-shaped stop ring member 40 is accommodated. The stop ring member 40 is formed of, for example, spring steel having a circular cross section, and is housed in the groove portion 38 in a compressed state by reducing the diameter. Therefore, the stop ring member 40 acts to expand the diameter in this state.

A packing member 42 is provided on the step of the inner wall of the joint body 26. This packing member 42 is
Airtight packing 4 made of elastic material in the shape of a circular ring
2A and a fireproof packing 42B, which is continuously provided on the front end side and is made of a circular ring-shaped elastic body, are fixedly provided. The fireproof packing 42B may not have elasticity, may not be circular and may be, for example, C-shaped, and the installation position may not be continuous with the airtight packing 42A. The position on the tip side is not limited. The airtight packing 42A is made of, for example, NBR (nitrile rubber), fluororubber, or the like, and the fireproof packing 42B is made of an elastic body formed by integrally molding expansive graphite and a rubber material such as NBR. When exposed to a high temperature such as, the volume of the fireproof packing 42B expands to seal the inside. When the bellows tube F is inserted, the bellows tube F can be inserted while elastically pressing the inner peripheral surfaces of the both packings 42B and 42A.

A ring-shaped stopper member 44 as shown in FIGS. 3 and 4 is provided between the base end of the airtight packing 42A and the step of the inner wall of the joint body 26. To be FIG. 4A shows a plan view of the stopper member, and FIG. 4B shows the same sectional view. The stopper member 44 is a ring portion 4 fixed to the joint body 26 side.
6 and a plurality of engaging pieces 48 provided on the inner side thereof at equal intervals along the circumferential direction. The bellows tube F is inserted through the inside of the ring portion 46, and the engagement piece 48 extends toward the center of the ring portion 46 in the insertion direction of the bellows tube F by a predetermined angle θ, for example, 45. The inner diameter of the tip is set to be smaller than the diameter of the convex portion 20 of the bellows tube F.

The stopper member 44 is made of, for example, resin or metal and has some elasticity. Therefore,
When the bellows tube F reaches the ring-shaped stopper member 44, the bellows tube F abuts on the engaging piece 48 and elastically expands and contracts the engaging piece 48 to be inserted through the inside. A ring-shaped retainer member 50 is installed between the nut member 30 and the packing member 42. The retainer member 50 may be entirely formed of a metal such as a brass material or a stainless steel material, or may be formed by joining a resin and a metal. As shown in FIGS. 5 and 6,
The cylindrical front flange 52 and one end thereof are integrally formed with each other, and when the nut member 30 is pushed in, the refractory packing 4 is inserted.
The rear projection 54 is in contact with the end face of 2B. Specifically, the cylindrical front brim portion 52 is formed.
The length L1 (see FIG. 5) is set to, for example, about 5 mm, and the outer diameter D1 is set to be substantially the same as the inner diameter of the nut member 30 on the base end side or slightly smaller than this. The outer peripheral surface of the front brim portion 52 is in sliding contact with the inner wall of the nut member 30 so that it can be held or supported here.

The inner diameter of the front flange is set to be slightly larger than the outer diameter of the convex portion 20 of the bellows tube F so that the bellows tube F can be inserted into the front flange 52. Has become. The plurality of rear projections 54 integrally formed with the front brim portion 52 are disclosed in Japanese Patent Application No. 2001-22.
Unlike the case disclosed in 0433, when no load is applied, the diameter is increased so as to be inclined outward in the radial direction, that is, to open outward. Further, the rear projection 54 is made slightly thicker, and a projection 56 extending inward in the radial direction is formed on the base end side thereof. The inner diameter of the protrusion 56 is set to be larger than the outer diameter of the convex portion 20 of the bellows tube F. Then, the end surface 54A (see FIG. 6) on the base end side of the rear protrusion 54 is flattened,
The end surface 54A comes into contact with the end surface of the refractory packing 42B on the front end side. And each rear protrusion 5
4 can be expanded / contracted in the radial direction with the ring-shaped front flange 52 as a fulcrum.

An expanding taper surface 54B (see FIG. 6) which fits into the recess 18 of the bellows tube F when the diameter is reduced is formed on the inner surface of each of the rear projections 54. Further, in front of the outer surface side of each of the rear projections 54, when the nut member 30 is pushed in and when a force is applied to the bellows tube F in the pull-out direction, a pull-out preventing taper surface, which will be described later, provided on the nut member 30. 60 and the rear projections 54
54C is formed so as to elastically bend and deform in the direction of diameter reduction, that is, in the direction of the central axis of the pipe joint 16. The end portion of the nut member 30 may have any shape as long as it has a function of reducing the diameter of the retainer member 50 when the retainer member 50 is pressed. For example, instead of being a tapered surface, a curved surface shape with R may be used, or an end surface processed in multiple steps may be used, and further, a right-angled end surface obtained by simply cutting off the end vertically may be used. . Then, returning to FIG. 1, the proximal end portion of the nut member 30 is formed with a slip-off preventing taper surface 60 that is inclined at a predetermined angle along the distal end direction at a predetermined angle in the axial direction, When a force is applied in the pull-out direction of the bellows tube F that has been completely inserted, the reduced diameter tapered surface 54C of the retainer member 50.
However, the rear projection 54 can be moved in the axial direction by coming into contact with the slip-out preventing tapered surface 60.

Further, on the inner wall of the joint body 26 on the tip side,
A stop ring accommodating recess 62 is formed in correspondence with the position of the stop ring member 40 when the nut member 30 is not inserted (before being pushed). The stop ring accommodating recess 62 and the groove 38 of the nut member 30 facing the stop ring accommodating recess 62.
The stop ring member 40 is housed so as to extend over both of the above. The rear side surface of the stop ring accommodating recess 62 is formed with a taper surface 62A that is inclined toward the center as it goes deeper in the joint body 26, and when the nut member 30 is pushed in, the stop ring member 40 is tapered. The diameter is elastically reduced while moving along the surface 62A. And
An enlarged ring-shaped stop ring holding step 64 is formed on the inner wall of the joint body 26 at a position slightly apart from the rear end of the tapered surface 62A. The stop ring member 40, which has been elastically reduced in diameter, expands again in diameter and fixes the nut member 30 (see FIG. 7B).

At this time, the depth of the stop ring holding step portion 64 is set to be substantially the same as the depth of the stop ring accommodating concave portion 62, and the nut member 30 is used.
Stroke length SL1 which is the pushing amount (see Fig. 1)
Is set to be approximately the same as the distance between the stop ring accommodating recess 62 and the stop ring holding step 64. Further, a through hole is formed in a part of the joint main body 26 so as to pass through in the radial direction, and a selective permeable member 66 that allows gas to permeate from the inside to the outside but does not permeate solids or liquids is attached to the through hole. is there. The selective permeable member 66 does not necessarily have to be provided on the joint body 26 side, but a through hole may be provided on the nut member 30 side, or the joint body 2 may be provided.
It may be provided so as to be sandwiched between 6 and the nut member 30. Since gas permeates from the inside of the joint to the outside of the selectively permeable member 66, in the unlikely event that a gas is leaked due to a hole being punched in the bellows tube F, the surface of the bellows tube F and the resin coated on the outer surface thereof are prevented from leaking. The gas enters the joint through the gap between the coating layer 22 and the coating layer 22, and the gas permeates the selectively permeable member 66 and is ejected to the outside of the pipe joint 16. Therefore, by arranging the bellows pipe F and then bringing the gas leakage detector close to the portion of the selectively permeable member 66 of the pipe joint 16, it is possible to easily detect the piercing defect of the bellows pipe F, and it is possible to detect it in advance. Can prevent gas accidents.

Next, a method of using the plug-in type pipe joint configured as described above will be described. First, the worker is shown in FIG.
From the state shown in FIG.
The pipe insertion hole 28 and the pipe insertion hole 24 of the joint body 26 are inserted and then inserted. And further bellows tube F
6A and 7A, the tip of the bellows tube F is ring-shaped retainer member 50 as shown in FIG. 6A and FIG. 7A.
The tip reaches the stopper member 44 while being inserted through the inside and further elastically contacting with the inner circumference of the packing member 42. And
When the bellows tube F is further inserted, the tip of the bellows tube F is inserted into the plurality of engaging pieces 48 of the stopper member 44 while elastically expanding the plurality of engaging pieces 48. The insertion is stopped by coming into contact with the reduced diameter portion of the joint body 26. FIG. 7A shows a state in which one peak of the convex portion 20 at the tip of the bellows tube F is inserted, and in this state, the bellows tube F is temporarily fixed by the stopper member 44. In addition, if the position of the reduced diameter step portion of the joint body 26 is further retracted, a plurality of convex portions (mountains) will be inserted,
The number is not limited.

At this time, the operator feels a click every time the protrusion 20 of the bellows tube F is inserted into the stopper member 44, so that the bellows tube F is inserted to a predetermined position. Therefore, it is not necessary to make markings or the like on the bellows tube F to confirm the insertion amount. In this state, the bellows tube F is lightly pulled in the pull-out direction to confirm that it is temporarily fixed by the stopper member 44.

Next, as shown in FIG. 7B, the nut portion 30 is pushed toward the joint body 26 in the inserting direction until the gap between the two is almost eliminated. At this time, the removal preventing taper surface 60 of the tip end portion of the nut member 30 contacts the diameter-reducing taper surface 54C of the retainer member 50 to elastically center the rear protrusion 54, as shown in FIG. 6B. The rear projection 54 fits into the concave portion 18 of the bellows tube F, and firmly presses and fixes this portion. Further, at this time, the retainer member 50 moves to some extent in the pushing direction to move the end surface 5
4A (see FIG. 6) presses the packing member 42 in the compression direction, so that the packing member 42 is used as the bellows tube F.
Since it comes into pressure contact with the outer peripheral surface of, the sealability can be improved accordingly.

Simultaneously with the pushing of the nut member 30, the stop ring member 40 is slidably in contact with the tapered surface 62A in a state where the stop ring member 40 is partially accommodated in the groove portion 38, and the diameter thereof gradually elastically contracts. Once the nut member 30 has been diameterd and is fully pushed and inserted into the fitting body 26, the reduced diameter stop ring member 40
Will reach the stop ring holding step portion 64 and expand in diameter. As a result, the nut member 30 and the joint body 26 are fixed so as to be constrained to each other via the stop ring member 40 and are locked, and the assembling operation is completed. Also, at the same time when the bellows tube F is inserted,
The ring-shaped inner projecting portion 36A of the watertight packing 36 is in contact with the outer peripheral surface of the coating layer 22 of the bellows tube F in a bent state, and the watertightness thereof is maintained.

When a force is applied to the bellows tube F in the pull-out direction, the retainer member 50 is fitted into the recess 18 of the bellows tube F and is in a locked state with the recess 18.
Moves integrally in the pulling-out direction for a short distance. Then, since the reduced-diameter tapered surface 54C of the rear projection 54 of the retainer member 50 is in contact with the slip-out preventing tapered surface 60 of the nut member 30, The rear projection 54 is further pressed in the diameter reducing direction, that is, in the central axis direction of the pipe joint. As a result, the projection 56 of the rear projection 54 is
The bellows pipe F is prevented from coming off the pipe joint 16 and dropping out because the bellows pipe F is blocked because it is pressed against the concave portion 18 more strongly. In this way, the bellows pipe F is inserted into the pipe joint 16 without making the structure of the pipe joint 16 so complicated, and then the nut member 30 is simply pushed in to be mounted while maintaining a reliable sealing property. be able to. Moreover, the bellows pipe F is the pipe joint 16
It is also possible to prevent it from coming off and falling off. Also, every time the stopper member 44 crosses over one convex portion 20 of the bellows tube F, the operator can feel a click, and thus the insertion state can be grasped sensuously.

<Second Embodiment> Next, a second embodiment of the present invention will be described. In the above-described first embodiment, when the nut member 30 is pushed in and once in the locked state,
It was somewhat difficult to disassemble the pipe joint 16 for re-construction, but in the second embodiment, the bellows pipe F and the nut member 30 can be removed from the joint body 26 by a simple operation. And 8 is a sectional view showing a second embodiment of the present invention, FIG. 9 is a perspective view showing a spacer member, and FIG.
[Fig. 3] is a view showing a disassembling process of the plug-in type pipe joint. 1 to
The same parts as those described in FIG. 7 are designated by the same reference numerals, and the description thereof will be omitted. In FIG. 8, the upper half of the drawing shows the state before the nut member 30 is pushed in (before construction).
The figure in the lower half shows the state after pushing (after construction).

Here, as shown in FIG. 8, the joint body 2
On the inner wall of 6, the ring-shaped stop ring holding step 6 is formed adjacent to the stop ring holding step 64.
4, there is provided a ring-shaped disassembled enlarged diameter step portion 70 having an inner diameter larger than the inner diameter of 4, that is, an inner diameter capable of completely containing the stop ring member 40 therein. The disassembled enlarged diameter stepped portion 70 is adjacent to the pushing-in direction side of the bellows tube F.
Therefore, the inner wall of the joint main body 26 is in a state where two steps are formed in this portion by the stop ring holding step portion 64 and the disassembling enlarged diameter step portion 70.

The enlarged head portion 30A of the nut member 30 and the sliding portion 30B inserted into the joint body 26 side.
A spacer member 72 having a rectangular cross section, which is made of an elastic body formed in a C-shape as shown in FIG. 9, is interposed between the watertight O-ring 34 and the tip of the watertight O-ring 34. As described above, the spacer member 72 is made of an elastic body such as resin so that it can be attached and detached. Moreover, when the nut member 30 is pushed in, the head portion 30 is pressed.
This spacer member 72 is provided between A and the tip of the joint body 26.
Is interposed so that the nut member 30 cannot be further pushed in by an amount corresponding to this thickness. That is, the spacer member 72 prevents the nut member 30 from being inserted into the joint body 26 by a predetermined amount or more. In the case of this embodiment, the length of the sliding portion 30B from the groove portion 38 to the head portion 30A of the nut member 30 is set to be long by a distance corresponding to the thickness T1 of the spacer member 72.

In the second embodiment constructed as described above, if the spacer member 72 is attached to the nut member 30 as shown in FIG. As in the case of the embodiment, the bellows pipe F is inserted into the joint body 26, and then the nut member 30 is pushed in, whereby the whole assembly can be completed. In this case, the head portion 30A of the nut member 30
A spacer member 72 is interposed between and the end surface of the joint body 26.

If it becomes necessary to perform re-construction for some reason in such a state, first,
As shown in FIG. 10 (A), the spacer member 72 made of an elastic material is removed from the nut member 30, and then the nut member 30 is replaced with the spacer member 7 as shown in FIG. 10 (B).
2 is further pushed in by a length corresponding to the thickness T1. Then, the stop ring member 40, which has been positioned in the spring holding step portion 64 until now, is further pushed in by a short distance and is completely accommodated in the disassembling enlarged diameter step portion 70 having a larger inner diameter. As a result, the engagement between the nut member 30 and the joint body 26 is released. Next, as shown in FIG. 10C, by pulling out the disengaged nut member 30, both can be disassembled. Therefore, the retainer member 50 is in a free state, and the bellows space F can be pulled out integrally with the stopper member 44 and the packing member 42 fitted to the tip.

<Third Embodiment> Next, a third embodiment of the present invention will be described. In the first and second embodiments described above, in the event of a fire or the like, for example, the rubber airtight packing 42A is burned down, while the fireproof packing 42B is thermally expanded to fill and fill the voids generated in this part. However, the filling space expands to the occupied space of the airtight packing 42A that has been burned out, and a large fireproof packing 42B is required accordingly, but in this third embodiment, the space to be filled is large. To be smaller.

FIG. 11 is a partial cross-sectional view showing a third embodiment of the present invention, FIG. 12 is a perspective view showing an annular expansion stop ring, and FIG. 13 is an operation in case of a fire in the previous embodiment and the third embodiment. It is a figure explaining the difference of. The same parts as those described in FIGS. 1 to 10 are designated by the same reference numerals, and the description thereof will be omitted. Here, as shown in FIG. 11, in the packing 42, the airtight packing 42A and the fireproof packing 4 are provided.
An annular expansion stop ring 74 as shown in FIG. 12 is interposed between the 2B and 2B. This extended stop ring 7
4 may be formed of a fire-resistant metal plate such as stainless steel, brass, or an iron-based material. Correspondingly, in order to prevent movement of the expansion stop ring 74, a movement preventing stepped portion 76 having a reduced inner diameter is provided in a ring shape on the inner wall of the joint body 26. In this case, when the packing member 42 is in a non-compressed state, the expansion stop ring 74 has a predetermined distance L from the movement blocking step portion 76 to the tip side, that is, to the nut member 30 side.
3, for example, set so as to be apart from each other by about 0 to 5 mm.

Now, in the third embodiment constructed in this way, at the time of normal construction, FIG. 11 (A) and FIG.
As shown in (B), when the nut member 30 is pushed in, the entire packing member 42 that is in contact with the retainer member 50 is compressed, and together with this, the expansion stop ring 7 is also pressed.
4 slides to the back of the joint body, and when this moves backward to the vicinity of the movement preventing step portion 76, the nut member 30
And the joint body 26 via the stop ring member 40,
They are coupled to each other to be in a locked state (see FIG. 11 (B)). Here, when a fire or the like occurs and the pipe joint is exposed to a high temperature, the airtight packing 42A made of rubber or the like is burned down to form a void, and the fireproof packing 42B expands in volume. In this case, the expansion stop ring 74
If no is provided, as shown in FIG.
The expanded fire-resistant packing 42B spreads largely even to the portion occupied by the burnt-out airtight packing 42A, and the filling space becomes large, so that a large fire-resistant packing 42B is required to maintain sufficient sealing performance. Or, in the worst case, the sealing property is significantly reduced.

On the other hand, as shown in FIG. 13 (B), when the expansion stop ring 74 is provided, this action reduces the filling space, and the small fireproof packing 42B has a high sealing property. Can be maintained. Further, in this case, in the situation shown in FIG. 13 (B), if the peripheral end of the expansion stop ring 74 is set to face the convex portion (mountain portion) 20 of the bellows tube F, the space between the two can be set. It is possible to reduce the amount of the refractory packing 42B that thermally expands due to a very small gap to leak to the occupied area side of the burned airtight packing, and to further improve the sealing property. Here, by setting the gap 78 between the outer peripheral surface of the tip end portion between the bellows F and the inner wall surface of the joint body 26 to be very small, the reliability of the sealing property can be improved.

<Fourth Embodiment> Next, a fourth embodiment of the present invention will be described. In the first to third embodiments, when a force is applied to the space F between the bellows in the pull-out direction, the retainer member 50 slightly moves in the pull-out direction along with it, and the protrusion 56 of the retainer member 50 (see FIG. 6). However, due to the slight movement of the retainer member 50, the compressing force of the packing member 42, which has been compressed until now, is slightly reduced, and the sealing performance may be deteriorated. Therefore, the fourth embodiment has a structure capable of preventing the deterioration of the sealing property. 14 is a partial cross-sectional view showing a fourth embodiment of the present invention, FIG. 15 is a cross-sectional view showing a ring-shaped packing pressing member, and FIG. 16 is an operation when applying a pulling force in the previous embodiment and the fourth embodiment. It is a figure explaining a difference. 1 to 13, the same parts as those described above are designated by the same reference numerals and the description thereof will be omitted.

Here, as shown in FIG. 14, a ring-shaped packing pressing member 80 is provided on the front end surface of the refractory packing 42B forming the packing member 42 so as to cover it substantially.
Is provided. The packing pressing member 80 is made of, for example, a resin or a metal material, and has an inverted cross section L as shown in FIG.
A bent protrusion 82 that is formed in a letter shape and protrudes in the front end direction is formed. The length of the bent protrusion 82 is equal to that of the nut member 3.
It is preferable to set 0 so as to be in contact with the tip of the nut member 30 after the construction is carried out in order to prevent the deterioration of the sealing property. The cross-sectional shape does not necessarily have to be an inverted L shape.

In the fourth embodiment thus constructed, when the nut member 30 is pushed into the joint body 26 and the construction is completed, as shown in FIG. 14, the packing member 42 is The end surface 54A of the retainer member 50 is pressed by the packing pressing member 80 and is fixed in a compressed state. At this time, the tip surface of the nut member 30 is also in contact with the tip of the bending projection 82 of the packing pressing member 80, or is in a state very close thereto. Here, when a large force is applied to the bellows tube F in the pulling-out direction, the ring-shaped retainer member 50 also slightly moves in the pulling-out direction and contracts in diameter, so that the bellows tube F is made stronger. When the bellows tube F is held and the pulling force is considerably large, the base end side of the bellows tube F also extends and the unevenness disappears.

At this time, if the packing pressing member 80 is not provided as shown in FIG. 16 (A), the pressing force of the packing member 42 decreases with a slight movement of the retainer member 50. The packing member 42, which has been compressed so far, returns to its original shape, and therefore, there is a possibility that the sealing performance is deteriorated due to a gap or the like being generated between the packing member 42 and the outer peripheral surface of the bellows tube F. On the other hand, when the packing pressing member 80 is provided as shown in FIG. 16B, even if the retainer member 50 slightly moves in the pull-out direction as described above, the packing pressing member 80 is Since the bending protrusion 82 is fixed so as not to move by coming into contact with the tip end surface of the nut member 30, the compressed state of the packing member 42 is not released. Therefore, the packing member 4
Since the compressed state of No. 2 is maintained, it is possible to prevent the sealing property from being deteriorated.

<Fifth Embodiment> Next, a fifth embodiment of the present invention will be described. The fifth embodiment has a structure capable of preventing the deterioration of the sealing property as in the case of the fourth embodiment. FIG. 17 is a partial sectional view showing the operation of the fifth embodiment of the present invention, and FIG. 18 is a perspective view showing a C-shaped elastic packing pressing member. In the previous fourth embodiment, the ring-shaped packing pressing member 80 is provided, but instead of this, in this fifth embodiment, a resin-made or metal molded in a C-shape for imparting elastic force is used. Elastic packing pressing member 8
4 is used. As a result, this elastic packing pressing member 8
4 is elastically contractable.

The elastic packing pressing member 84 is interposed between the tip of the packing member 42 and the retainer member 50, and the inner wall surface of the joint main body 26 in this portion faces the packing member 42 side. A ring-shaped taper surface 86 for reducing the diameter, the radius of which gradually decreases.
Are formed. As a result, when the nut member 30 presses the elastic packing pressing member 84 via the retainer member 50, the elastic packing pressing member 84 moves while reducing its diameter along the tapered surface 86. Furthermore, a ring-shaped pressing member fixing groove 88 having a rectangular cross section is formed on the inner wall surface of the joint body 26 so as to correspond to the position of the elastic packing pressing member 84 when the nut member 30 is completely pressed. The elastic packing member 84 can be expanded in the groove 88 to be accommodated and fixed.

Now, in the fifth embodiment thus constructed, at the time of construction, as shown in FIG. 17A, as the nut member 30 is pushed into the joint body 26, the tip of the retainer member 50 is pushed. The packing member 42 is pressed and compressed via the elastic packing pressing member 84. At this time, the elastic packing pressing member 84 contracts while sliding along the diameter-reducing tapered surface 86. Then, as shown in FIG. 17B, the nut member 30
When is completely pushed in, the elastic packing pressing member 84 reaches the pressing member fixing groove 88, expands in diameter there, and is fixed in the groove 88.

Here, as shown in FIG. 17 (C), a force is applied to the bellows tube F in the pulling-out direction to cause the retainer member 50 to move.
Even when the packing member 42 is slightly moved in the pulling-out direction, the elastic packing pressing member 84 is fitted and fixed in the pressing member fixing groove 88 as described above. Is never released. Therefore, since the packing member 42 is maintained in the compressed state, it is possible to prevent the sealing property from being deteriorated.

As a modification of the fifth embodiment, as shown in FIG. 19, the elastic packing member 84 is elastically contracted in advance between the airtight packing 42A and the fireproof packing 42B. You may make it intervene.
Then, the pressing member fixing groove 88 may be provided so as to correspond to the position of the elastic packing member 84 when the packing member 42 is compressed. Also in this case, as shown in FIG. 19B, the packing member 42 is fitted by the elastic packing member 84 fitted in the fixing groove 88.
Since the compressed state is maintained, the sealing performance can be maintained high even when a force is applied to the bellows tube F in the pull-out direction, as in the case of the fifth embodiment.

<Sixth Embodiment> Next, a sixth embodiment of the present invention will be described. In each of the above embodiments, the bellows tube F
If the nut member 30 is erroneously pushed into the joint body 26 side before the insertion of the stop ring, the stop ring member 40
Is fitted into the stop ring holding step portion 70, the nut member 30 and the joint body 26 are engaged with each other via the stop ring member 40 (see, for example, FIG. 7B), and the nut member. 30 cannot be pulled out and the bellows tube F cannot be inserted. Therefore, in the sixth embodiment, erroneous insertion of the nut member 30 is prevented.

FIG. 20 is a sectional view showing a sixth embodiment of the present invention. In FIG. 20, the upper half shows the state before inserting the nut member (before locking), and the lower half shows the state after inserting the nut member into the locked state (after locking). 21 is a plan view showing the incorrect insertion preventing collar member, FIG. 22 is a sectional view showing the incorrect insertion preventing collar member, FIG. 23 is a plan view showing the disassembling ring member, and FIG. 24 is a disassembling ring member. It is sectional drawing shown. The same components as those in the above-described embodiments are designated by the same reference numerals and the description thereof will be omitted. Further, here, the selectively permeable member 66 is provided not on the joint body 26 but on the side of the nut member 30, but the mounting position is not particularly limited as described above.

Now, in this sixth embodiment, FIG.
As shown in FIG. 21, an erroneous insertion preventing collar member 90 as shown in FIGS. 21 and 22 is detachably interposed between the head portion 30A of the nut member 30 and the tip portion of the joint body 26. There is. It should be noted that, in the lower half of FIG. 20, the erroneous insertion preventing collar member 90 is not shown because it has been removed and removed. The erroneous insertion preventing collar member 90 includes a collar body 90A made of a material having a substantially ring-like shape, that is, a C-shape, which is formed by cutting out a part of a circular ring, such as a polyethylene resin, and the collar body 90A.
And a handle 90B attached to.
The portion of the collar body 90A whose radius can be elastically expanded and contracted is the head portion 60A and the joint body 26.
Between the tip of the nut member 30, that is, the sliding portion 30 of the nut member 30.
It is fitted and mounted on the outer peripheral side portion of B. The width W1 of the collar main body 90A is set to the length of the initial distance between the head portion 60A and the joint main body 26 before the construction, so that even if the nut member 30 is erroneously pushed before the construction, this It is designed to be prevented from being inserted into the joint body 26 side.

Also, as shown in FIG. 22, a notched step portion 90C is formed in a ring shape in the circumferential direction on the inner peripheral side of one end of the C-shaped collar main body 90A. Then, as shown in FIGS. 23 and 24, a ring-shaped disassembling ring member 92 is fitted in advance in the notch step portion 90C. The disassembling ring member 92 is
It is made of a thin material such as polyethylene resin and is easily cut. The disassembling ring member 92 is
The spacer member 72 has a function similar to that of the spacer member 72 shown in FIG.
2 is only about 2 mm, and this width W2 is equal to that of the stop ring member 40 located in the stop ring holding step portion 64.
It is long enough to be dropped into the disassembling step 70 adjacent to the stop ring holding step 64.

Particularly, a thin portion 92A having a smaller thickness is formed on a part of the disassembling ring member 92, which can be easily cut by concentrating a force on the thin portion 92A. It is like this. Further, next to the thin portion 92A, a pulling ear portion 92B which is formed in a circular ring shape and protrudes toward the outer peripheral side is formed. By pulling the pulling ear portion 92B, the thin portion 92A is formed.
It is designed to concentrate this cutting force on. here,
This disassembly ring member 92 is provided with a collar member 90 for preventing incorrect insertion.
When it is fitted into the notched stepped portion 90C, the portion of the pulling ear portion 92B is replaced with the cut portion 94 of the collar body 90A.
(See FIG. 21) so that it fits in.

The inner wall of the joint body 26 is provided with a slip-off preventing engagement portion 96 corresponding to the position of the packing member 42 installed therein, for preventing the packing member 42 from slipping out. Has been. In this embodiment, as shown in FIG. 20, the slip-off preventing engagement portion 96 is formed by forming a protruding portion slightly protruding from the inner wall of the joint body 26 in the central direction, and the airtight packing is formed at this portion. 42
A part of A is engaged. The slip-off preventing engagement portion 96 may be formed by providing a recess instead of a protrusion on the inner wall of the joint body 26. In this case, the airtight packing 4 is attached to the recess preventing engagement portion 96.
Part of 2A will be engaged.

Further, an expansion stop ring 74 used to improve the airtightness of the expanding fireproof packing 62B.
Is not formed in a simple flat plate ring shape as shown in FIGS. 11 to 13, but is formed in an L-shaped cross section. As a result, the area where the expansion stop ring 74 and the bellows tube F are opposed to each other with a small gap therebetween is widened, and as a result, leakage of the expansion packing when the refractory packing 42B is thermally expanded is further suppressed. The airtightness can be improved accordingly. The expansion stop ring 74 is made of a metal plate such as brass, and when the packing member 42 is molded, the airtight packing 42A is formed.
It is possible to integrally form the expansion stop ring 74 by sandwiching the expansion stop ring 74 between it and the refractory packing 42B by insert molding with a mold.

In the plug-in type pipe joint of the sixth embodiment, since the collar member 90 for preventing erroneous insertion is always attached to the nut member 30 when not in use, the nut member 30 is erroneously attached. Even if pushed, the erroneous insertion preventing collar member 90 can prevent the nut member 30 from being erroneously inserted into the joint body 26. In addition, in order to carry out construction using such a plug-in type pipe joint of the sixth embodiment,
First, in a state where the collar member 90 for preventing erroneous insertion is attached to the nut member 30, the nut member 30 and the joint body 26 are
The bellows tube F is inserted or inserted into the inside. At this time, the bellows tube F
Even if the tip end of the coating layer 22 comes into contact with the nut member 30, since the erroneous insertion preventing collar member 90 is interposed as described above, the bellows tube F is completely inserted at an early stage. Before this nut member 30
It is possible to prevent the sliding movement to the side.

In this way, the bellows tube F is connected to the joint body 26.
If it is fully and completely inserted into the
Upper half state), and then by holding the handle 90B by hand and pulling it, the incorrect insertion preventing collar member 90
Is removed from the nut member 30. In this case, the disassembling ring member 92 remains in the state of being attached to the sliding portion 30B of the nut member 30. Then, in this state, the nut member 30 is inserted into the joint body 26 as far as it will go.
As shown in the lower half of 0, the bellows tube F is completely fixed by the retainer member 50 to be in the locked state, whereby the construction work is completed.

Here, in the case of changing the position of the pipe for remodeling of a house, it is necessary to disassemble the plug-in type pipe joint and perform the construction again. In such a case, this plug-in type tube joint is in the state shown in the lower half of FIG. 20, and first, between the head portion 30A of the nut member 30 and the tip portion of the joint body 26. The interposing disassembly ring member 92 is cut and removed. Since the disassembled ring member 92 is in a state in which the pulling ear portion 92 with holes is exposed to the outside when the erroneous insertion preventing collar member 90 covering the outside is removed.
By inserting a screwdriver or the like into C and pulling it outward, particularly the thin portion 92A is easily cut,
The disassembling ring member 92 can be easily removed and removed.

As described above, when the disassembling ring member 92 is removed, a gap is formed in the portion where the disassembling ring member 92 is mounted, so that the nut member 30 is pushed further into the joint body 26. Then, until now, the stop ring holding step 64
The stop ring member 40, which was located at, is slightly pushed inward and moves, so that the stop ring member 40 spreads to the disassembled expansion step portion 70 and falls, and as a result, the engagement between the nut member 30 and the joint body 26 is released. Since it is released, the nut member 30 can be pulled out to the outside. As a result, the retainer member 50 is restored so as to expand and the engagement with the bellows tube F is cut off, and the bellows tube F can be pulled out to the outside.
The operation at this time is the same as that described with reference to FIG. Further, in the case of this re-construction, even if the tip of the bellows tube F is engaged with the stopper member 44, a slightly larger pulling force is required, but the stopper member 44, the packing member 42, the retainer member 50, etc. Accordingly, this bellows tube F can be pulled out to the outside.

In addition, when the tip of the bellows tube F does not reach the stopper member 44 at the time of construction, but when it reaches the packing member 42, the operator pushes the bellows tube F for insertion confirmation. Sometimes I try to pull it out,
In this case, in the above-described embodiment, the packing member 42 and the bellows tube F are engaged by the frictional force, and therefore the packing member 42 is pulled out by pulling out the bellows tube F.
Also moves integrally in the pulling-out direction, and as a result, the tip portion of the packing member 42, that is, the refractory packing 42B abuts the retainer member 50 and deforms it in the diameter reducing direction, so that the bellows tube F is locked. It will not come out. On the other hand, in the case of the present embodiment, the packing member 42 is caught by the protruding disengagement preventing engagement portion 96 provided on the inner wall of the joint body 26 and its movement is blocked, so that the retainer member 50 is contracted. Since there is no diameter, the bellows tube F can be pulled out to the outside.

[0063]

As described above, according to the plug-in type pipe joint of the present invention, the following excellent working effects can be exhibited. According to the inventions of claims 1 to 5, when the bellows tube is inserted into the joint body, the bellows tube is inserted through the ring-shaped retainer member and the packing member, and the tip thereof comes into contact with the stopper member. One or more ridges are inserted while expanding and contracting the diameter of the packing member, and the inner peripheral end of the stopper member is fitted into the recess of the bellows tube. When the nut member is further pushed in this state, the tip of the retainer is retained. The retainer member comes into contact with the member to reduce its diameter, and one end of the retainer member is fitted into the recess of the bellows tube. Moreover, the nut member is fixed to the joint body side by the stop ring member. Complete. In this state, when a force is applied to the bellows tube in the pull-out direction, the stopper member and the packing member integrally move slightly in the pull-out direction to give a force to move the retainer member in the pull-out direction, or the retainer member Since one end is fitted in the concave portion of the bellows tube, a force for moving the retainer member in the pull-out direction is applied, and at this time, the retainer member in contact with the nut member is given a force so that the diameter is reduced. Since the bellows tube is prevented from being pulled out, simply insert the bellows tube into the joint body by inserting it fully and then pushing the nut member to connect the bellows tube while maintaining good sealing performance. It can be carried out. Therefore, the connecting operation of the bellows pipe can be easily and surely performed without making the structure of the plug-in type pipe joint so complicated. According to the invention of claim 6, when disassembling the plug-in type pipe joint once assembled for re-working, the spacer member is removed from the nut member and the nut member is further moved to the joint body side. By pushing in, the internal stop ring member is fitted into the diameter-expanded step portion and the diameter of the stop ring member itself is increased, whereby the engagement between the nut member and the joint body can be released. According to the inventions of claims 7 and 8, when the packing member is exposed to a high temperature such as during a fire, a part of the fireproof packing expands, but at this time, the ring-shaped packing fixed by the movement preventing step portion is used. Due to the action of the expansion stop ring, it is possible to prevent the fireproof packing from randomly expanding the gap between the bellows pipe and the plug-in type pipe joint, and to concentrate this in one place, which allows for a fire or the like. Can also maintain high sealing performance. According to the invention of claim 9, when a force is applied to the bellows tube in the extracting direction after the assembling of the bellows tube is completed, even if the retainer member moves to some extent in the extracting direction, the packing pressing member is The packing pressing member does not substantially move in contact with the nut member, and therefore, the packing member is maintained in a pressed and compressed state, so that the sealability is not deteriorated.
A high sealing property can be maintained. According to the invention of claim 10, when the nut member is pushed in, the elastic packing pressing member is fitted and fixed in the pressing member fixing groove in a state where the packing member is pressed and compressed. Even when a force is applied to the bellows tube in the pull-out direction, the action of the elastic packing pressing member keeps the packing member pressed and compressed, so that the sealing performance does not deteriorate and is high. The sealing property can be maintained. According to the eleventh aspect of the present invention, when the nut member is pushed in, the expanded-diameter elastic packing pressing member is fitted and fixed in the expanded-diameter pressing member fixing groove in a state in which the packing member is pressed and compressed. Even when a force is applied to the bellows tube in the pulling direction after the assembly is completed, the packing member is kept pressed and compressed by the action of the expanded diameter elastic packing pressing member, so that the sealing property is deteriorated. Therefore, high sealing performance can be maintained. According to the invention of claims 13 and 14, the collar member for preventing incorrect insertion is detachably mounted between the head portion of the nut member and the tip portion of the joint body. It is possible to prevent accidentally pushing into the joint body. According to the inventions of claims 15 to 17, when the plug-in type pipe joint is disassembled for reconstructing the house or the like for remodeling of the house, the head portion of the nut member and the tip portion of the joint body are By cutting and removing the disassembling ring member interposed between the nut member and the disassembling ring member, the nut member can be further pushed into the joint main body side by a length corresponding to the width of the disassembling ring member. When pushed, the stop ring member will be dropped into the disassembly step portion, so the locked state between the joint body and the nut member is released, and as a result, the nut member can be retracted in the pull-out direction. Since it is possible, the bellows tube can also be pulled out. According to the eighteenth aspect of the present invention, when the tip of the bellows tube reaches the packing member during the insertion process of the bellows tube and the bellows tube is pulled out in the middle of the insertion for confirmation, the packing member prevents the packing member from coming off. Since the packing member is caught, the packing member can be prevented from moving in the removal direction, and as a result, only the bellows tube can be pulled out alone.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a plug-in type pipe joint and a bellows pipe according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a C-shaped stop ring member.

FIG. 3 is a perspective view showing a ring-shaped stopper member.

FIG. 4 is a diagram showing a stopper member.

FIG. 5 is a perspective view showing a retainer member.

FIG. 6 is a view for explaining the operation of the retainer member.

FIG. 7 is a process drawing showing the process of inserting the bellows tube into the plug-in type pipe joint of the first embodiment of the present invention.

FIG. 8 is a sectional view showing a second embodiment of the present invention.

FIG. 9 is a perspective view showing a spacer member.

FIG. 10 is a diagram showing a step of disassembling the plug-in type pipe joint.

FIG. 11 is a partial sectional view showing a third embodiment of the present invention.

FIG. 12 is a perspective view showing an annular expansion stop ring.

FIG. 13 is a diagram for explaining the difference in operation during a fire between the previous embodiment and the third embodiment.

FIG. 14 is a partial sectional view showing a fourth embodiment of the present invention.

FIG. 15 is a cross-sectional view showing a ring-shaped packing pressing member.

FIG. 16 is a diagram for explaining the difference in operation when applying a pulling force between the previous embodiment and the fourth embodiment.

FIG. 17 is a partial cross-sectional view showing the operation of the fifth embodiment of the present invention.

FIG. 18 is a perspective view showing a C-shaped elastic packing pressing member.

FIG. 19 is a diagram showing a modification of the fifth embodiment of the present invention.

FIG. 20 is a sectional view showing a sixth embodiment of the present invention.

FIG. 21 is a plan view showing an incorrect insertion preventing collar member.

FIG. 22 is a sectional view showing a collar member for preventing incorrect insertion.

FIG. 23 is a plan view showing a ring member for disassembly.

FIG. 24 is a sectional view showing a solution ring member.

FIG. 25 is a cross-sectional view showing a conventional pipe joint.

[Explanation of symbols]

16 Plug-in type fitting 18 recess 20 convex 26 Joint body 30 Nut member 40 Stop ring member 42 Packing member 42A airtight packing 42B fireproof packing 44 Stopper member 46 Ring part 48 engagement piece 50 Retainer member 52 Front brim 54 Rear projection 54B Expanded taper surface 54C tapered taper surface 70 Expansion step 72 Spacer member 74 Extended Stop Ring 76 Movement prevention step 80 packing pressing member 84 Elastic packing pressing member 86 taper surface for diameter reduction 88 Pressing member fixing groove 90 Incorrect insertion prevention collar member 90A color body 90B handle 92 Disassembly ring member 92A thin wall 92B Pull ear 96 Removal prevention engagement part F bellows tube

Continued front page    (72) Inventor Tomoyuki Minami             1-5-20 Kaigan, Minato-ku, Tokyo Tokyo Gas             Within the corporation (72) Inventor Fumitaka Sato             1-5-20 Kaigan, Minato-ku, Tokyo Tokyo Gas             Within the corporation (72) Inventor Yasushi Fujinawa             Sanco 1-17-14 Sakaemachi, Kawaguchi City, Saitama Prefecture             -Within Gas Seiki Co., Ltd. (72) Inventor Kazada Igarashi             Sanco 1-17-14 Sakaemachi, Kawaguchi City, Saitama Prefecture             -Within Gas Seiki Co., Ltd. (72) Inventor Makoto Ibayashi             2nd Daifuku, Kuwana City, Mie Prefecture Hitachi Metals Stock Association             Company Kuwana factory (72) Inventor Minoru Fujiyoshi             2nd Daifuku, Kuwana City, Mie Prefecture Hitachi Metals Stock Association             Company Kuwana factory (72) Inventor Shinya Kasai             2nd Daifuku, Kuwana City, Mie Prefecture Hitachi Metals Stock Association             Company Kuwana factory F-term (reference) 3H017 CA05

Claims (18)

[Claims] 1. A plug-in type pipe joint for connecting a bellows tube having a corrugated portion whose outer peripheral surface has a corrugated shape, wherein a pipe insertion hole for inserting the bellows tube is formed and an inner wall surface is stepped. Made into a joint body, a ring-shaped nut member slidably attached to the tip of the joint body in its longitudinal direction, a packing member provided at the step portion of the inner wall surface of the joint body, The bellows tube is provided on the proximal end side of the packing member and contacts the tip of the bellows tube when the bellows tube is inserted, and a part of the bellows tube expands and contracts in the radial direction of the bellows tube inwardly. A ring-shaped stopper member to be inserted, and interposed between the nut member and the packing member to press the packing member when the nut member is inserted, and one end can elastically expand and contract toward the center of the bellows tube. Done A ring-shaped retainer member, and a stop ring member that is provided on the nut member and that fixes the nut member when the nut member is inserted into the joint body side, wherein the nut member is the joint A plug-in type pipe joint, characterized in that when it is inserted into a main body, it comes into contact with the retainer member and deforms it in the diameter reducing direction. 2. The retainer member includes a cylindrical front flange portion that is in sliding contact with the inner wall of the nut portion, and a thick rear projection portion that is expanded outward when no load is applied. The plug-in type pipe joint according to claim 1. 3. An expanding taper surface which is in contact with the bellows tube when the diameter is reduced is formed on the inner surface side of the rear projection, and
The plug-in type pipe joint according to claim 1 or 2, wherein a tapered taper surface that is in contact with the nut member is formed on the outer surface side. 4. The rear protrusion and the front flange are provided with a plurality of cut grooves formed so as to cut in the lengthwise direction of the front flange while leaving a part of the end of the front flange. The plug-in type pipe joint according to claim 2 or 3. 5. The stopper member, which is fixed to the joint body side, is provided inside the ring portion, and contacts the outer peripheral surface of the inserted bellows tube to be elastically deformed. The plug-in type pipe joint according to any one of claims 1 to 4, which comprises a plurality of engaging pieces. 6. The nut member is provided with a spacer member that is detachable to prevent the nut member from being inserted a predetermined amount or more when it is inserted into the joint body.
On the inner wall of the joint body, a diameter expansion for allowing the diameter expansion of the stop ring member to release the engagement between the nut member and the joint body when the nut member is inserted with the spacer member removed. The plug-in type pipe joint according to any one of claims 1 to 5, wherein a step portion is formed. 7. The packing member is composed of a fireproof packing that expands at high temperature and an airtight packing having airtightness, and an annular expansion stop ring is provided between the fireproof packing and the airtight packing. The movement preventing step portion for preventing the movement of the expansion stop ring when the refractory packing is expanded is formed on an inner wall of the joint body. Plug-in type pipe fitting. 8. The plug-in type pipe joint according to claim 7, wherein the expansion stop ring has an L-shaped cross section. 9. The packing member is pressed against the one end surface of the packing member by abutting the tip end of the nut member or the rear end of the retainer member when the nut member is inserted and pressing the packing member. Touched the nut member,
Alternatively, the ring-shaped packing pressing member that is in a state of being in proximity is provided, and the plug-in type pipe joint according to any one of claims 1 to 8. 10. An elastic member that abuts on a front end of the nut member or a rear end of the retainer member when the nut member is inserted into one end surface of the packing member to press the packing member and reduce its diameter. A packing pressing member is provided, and a diameter-reducing taper surface for reducing the diameter of the elastic packing pressing member is provided on the inner wall of the joint main body, and the elastic packing pressing member is expanded in a state where the packing member is pressed. The insertion type pipe joint according to any one of claims 1 to 8, further comprising a pressing member fixing groove that is fixed. 11. The packing member includes a fireproof packing that expands at high temperature and an airtight packing that has airtightness, and an annular expansion stop ring is provided between the fireproof packing and the airtight packing. The inner wall of the joint body is provided with a radially expanded elastic packing pressing member that is compressed in a diameter reducing direction, and the inner wall of the joint body is provided with the radially expanded elastic packing pressing member in a state in which the packing member is pressed. 7. The plug-in type pipe joint according to any one of claims 1 to 6, further comprising a diameter-expanding pressing member fixing groove for expanding and fixing the diameter. 12. The plug-in type pipe joint according to any one of claims 1 to 11, wherein an end portion of the nut member is formed with a slip-out preventing taper surface. 13. The nut member includes a head portion having a large outer diameter and a sliding portion having an outer diameter smaller than that of the head portion and being substantially inserted into the joint body. The erroneous insertion preventing collar member having a predetermined width and being detachable is interposed between the joint body and a tip portion of the joint body. Plug-in type pipe fitting. 14. The collar member for preventing erroneous insertion comprises a collar body made of a substantially ring-shaped elastic material, which is formed by cutting out a part of a circular ring, and a handle attached to the collar body. 14. The plug-in type pipe joint according to claim 13, wherein 15. When the sliding portion is inserted into the joint body between the head portion and the tip portion of the joint body, the head portion is slightly separated from the tip portion of the joint body. A disassembling ring member having a minute width and easily cut so as to be separated by a distance is provided, and the disassembling ring member is removed on the inner peripheral surface of the joint body at the time of disassembling 15. The plug-in type pipe joint according to claim 13 or 14, wherein a disassembled expanded step portion is formed for dropping the stop ring member when the nut member is further inserted into the joint body. 16. The plug-in type pipe joint according to claim 15, wherein a part of the disassembling ring member is formed with a thin portion having a small thickness for easy cutting. . 17. The plug according to claim 15 or 16, wherein a part of the disassembling ring member is formed with a pulling ear portion for pulling when the disassembling ring member is removed. Type pipe fittings. 18. The slip-prevention engagement portion for engaging with the packing member and preventing the packing member from coming off, is formed on the inner wall of the joint body. The plug-in type pipe joint according to any one of 17.