JPH0735281A - Inserting-type pipe joint - Google Patents

Abstract

PURPOSE:To enable a connecting pipe to be easily inserted into a joint main body, and also to reliably prevent a pipe from slipping off by inserting the pipe by the fixed amount, so that the locking tool may initially bite in the outer peripheral surface of the pipe, the diameter may be reliably shortened by the taper inner surface of the joint main body in drawing of the pipe, and the locking tool may bite in the outer peripheral surface of the connecting pipe. CONSTITUTION:In an inserting-type pipe joint by which a pipe to be connected can be connected by being only inserted into a joint main body 1, a locking tool 3 attached to a locking tool chamber 16 provided with a taper inner peripheral surface 15 of the joint main body 1, and for preventing a connecting pipe from slipping off enlarges the width of a slit, so that the pipe may be easily inserted, and a groove diameter enlarging member 4 fitted into the slit of the locking tool 3 is detached when the connecting pipe is inserted, thereby the inside diameter of the locking tool 3 is shortened, so as to be engaged with the outer peripheral surface of the inserted connecting pipe. Thereby, the pipe can be reliably prevented from slipping off without any poor connection caused by the insufficient insertion state.

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 which can be connected to a connecting pipe by simply inserting the connecting pipe into the joint body. It relates to a blocking pipe joint.

[0002]

2. Description of the Related Art For example, as shown in FIG. 16 of Japanese Patent Application Laid-Open No. 3-265791, an inner peripheral surface O, P of a taper is provided on the inner surface of a receiving port of a joint body S, the diameter of which is gradually reduced toward the opening end. The taper inner peripheral surface is provided with a retaining member Q which is partly divided in the circumferential direction, and when the connecting pipe R is about to be pulled out, the taper retaining member Q is reduced in diameter on the taper inner peripheral surfaces O and P. Then, there is a pipe joint that bites into the outer peripheral surface of the connecting pipe R and prevents the connecting pipe R from coming out of the joint body S.

Also, the actual Kaihei 4 published on September 29, 1992
In Japanese Patent Laid-Open No. 111985, as shown in FIG. 17, a soft pipe inserted in a pipe insertion portion B of a joint body A is piped via a chuck ring E by a cap nut D screwed into a male screw portion C outside the pipe insertion portion. In a flexible pipe joint that is fastened to the insertion portion B, a window F is opened in the male screw portion C, and an indicator G is provided around the pipe insertion portion B so that the indicator abuts on the end surface of the soft pipe. The insertion length of the soft pipe is provided with a ring portion H fitted onto the pipe insertion portion, and a projection I projecting obliquely outward from the ring portion H toward the insertion direction of the soft pipe and fitted into the window F. There is disclosed a soft pipe joint configured so that the tip of the protruding piece I of the indicator G comes out of the window F when the amount becomes a predetermined amount. Further, a ring-shaped base body J that abuts on the front end surface of the male screw portion C, and projecting teeth that project obliquely inward from the base body J toward the insertion direction of the soft pipe and allow the insertion of the soft pipe and prevent the soft pipe from coming out. And a stopper L having a portion K.

[0004]

In the former plug-in type pipe joint of the above-mentioned conventional techniques, the inner diameter of the retainer Q is usually the same as or slightly smaller than the inner diameter of the connecting pipe R, and the inner surface T of the joint has a play. It is fitted, and by inserting the pipe R, the inner diameter of the retainer Q is expanded by the outer surface of the pipe, and is inserted deep into the retainer Q. When the pipe is inserted, the outer surface of the pipe R is reduced in diameter by the elastic force of the retainer Q itself, and when the pipe R is pulled out, the pipe R and the retainer Q are integrally retracted,
The stopper Q is reduced in diameter by the taper inner peripheral surfaces O and P of the main body so as to bite into the pipe R.

Therefore, if the end of the connecting pipe R to be inserted into the joint main body S is not chamfered U, it cannot be inserted smoothly and the workability is poor. If there is no chamfer U, the tip surface of the pipe R serves as a retainer Q. Sometimes it hits and cannot be inserted any further. Further, in the case of a pipe made of a hard material such as a steel pipe, it is easy to insert the retainer by expanding the inner diameter of the retainer by the guide of the chamfer U, but in the case of a soft pipe such as a resin pipe, the tip of the pipe R becomes the retainer Q. If it abuts, the tube itself may bend and cannot be inserted any further, or the outer peripheral surface of the tube R may be greatly scratched in the axial direction by the inner surface of the retainer Q.

In the latter soft pipe joint, the indicator G provided around the pipe insertion portion B is such that the tip of the projection I comes out from the window F when the soft pipe is inserted into the pipe insertion portion B.
The ring portion H is required so that the protruding piece I does not fall from the window F. Further, since the projection I of the indicator G is not locked, there is no elastic return action in the direction opposite to the tube insertion direction. Therefore, even if the pipe is pulled out after being inserted into the pipe insertion portion B and is not in contact with the ring portion H of the indicator G, the protrusion I
There is a problem that the window exits from the window F and indicates the tube loading state. In order to prevent this, an extra stopper L for allowing the insertion of the tube and preventing the tube from coming out is provided so as to eliminate an erroneous instruction of the indicator G, but there is a problem that the stopper L makes it difficult to insert the tube. .

The main body A and the cap nut D are used by inserting a soft tube in a temporarily assembled state as shown in the figure. However, since the cap nut D can be easily removed from the main body A, the internal parts are assembled. There is also a risk of making mistakes and lack of fitting. The present invention solves the above problems and makes it easy to insert the connecting pipe into the joint body, and prevents the retainer from biting into the outer peripheral surface of the pipe unless a predetermined amount of pipe is inserted. (EN) Provided is a plug-in type pipe joint capable of surely preventing the pipe from being pulled out by the inner surface of the taper of the joint body when the pipe is pulled out, and at the same time confirming the insertion of the pipe and compressing the packing.

[0008]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a taper on the inner surface side of the receiving end of the opening end, the diameter of which is gradually reduced toward the end.
A joint body having a retaining member chamber having an inner rear wall for locking the retaining device on the inner peripheral surface and the inner rear portion, and a groove expanding member chamber in the inner rear portion of the retaining device chamber; A retainer equipped with a split groove partly divided in the circumferential direction for mounting in the retainer chamber to prevent the connecting pipe from coming out, and a retainer chamber mounted in the groove expanding member chamber Then, a groove expansion having a rear end portion into which the width of the split groove of the retaining member is widened and fitted, and an abutment surface with a pipe pushed inward in the axial direction by the insertion of the connection pipe in the middle portion. Diameter member, and when the connecting pipe is inserted into the receiving port, the contact surface of the groove expanding member is pushed by the pipe end surface and the rear end part comes out of the fitting with the split groove of the retainer, and is pulled out. It is a plug-in type pipe joint characterized in that a stopper is reduced in diameter and locked to the outer surface of the inserted connection pipe.

Further, on the inner surface side of the receiving end of the opening end, there is provided a retaining member chamber having a taper inner peripheral surface whose diameter is gradually reduced toward the end portion, and a groove expanding member is provided at an inner rear portion of the retaining member chamber. A fitting main body having a chamber and a split groove that is partially cut in the circumferential direction to prevent the connecting pipe from coming out by being attached to the retaining device chamber, and in a free state, from the outer diameter of the connecting pipe. The retaining pipe having a slightly smaller inner diameter, and the connecting pipe at the rear end portion and the intermediate portion, which are mounted in the groove expanding member chamber from the retaining device chamber and widen the width of the split groove of the retaining device to be fitted. Groove expansion member having an abutment surface with a pipe pushed inward in the axial direction by insertion of a screw, and an elastic member attached to the inside of the retainer and pressing the retainer to the opening end side. When the connection pipe is inserted into the receiving port, the abutting surface of the groove expanding member is pushed by the pipe end surface, and the rear end portion is prevented from coming off. Off the fitting between split groove, a bayonet fitting, characterized in that the inner diameter of the retaining member is engaged with the outer surface of the connecting pipe inserted in diameter.

Further, on the inner surface side of the receiving end of the opening end portion, there is provided a retaining member chamber having a taper inner peripheral surface whose diameter is gradually reduced toward the end portion, and a groove expanding member is provided at an inner rear portion of the retaining member chamber. A joint body having a chamber and a window opening to the outer surface side of the groove expanding member chamber,
A retainer equipped with a split groove, which is attached to the retainer chamber to prevent the connecting pipe from coming out, and is provided with a split groove that is partly divided in the circumferential direction; Put on,
A rear end portion that fits by expanding the width of the split groove of the retainer,
Expanding the split groove having an abutting surface for contacting with a pipe that is pushed inward in the axial direction by inserting the connecting pipe in an intermediate portion, and an indicating portion that projects from the window when the abutting surface is pushed by inserting the pipe. A member and an elastic member that is mounted on the inner side of the retaining device and presses the retaining device toward the opening end side. When the connecting pipe is inserted into the receiving port, the contact surface of the groove expanding member is formed. Is pushed by the pipe end surface to be disengaged from the fitting with the split groove of the retainer, and the pointing portion projects from the window of the joint body.

Further, on the inner surface side of the receiving end of the opening end, there is provided a retaining member chamber having a taper inner peripheral surface which is gradually reduced in diameter toward the end portion, and from the inner back portion of the retaining member chamber to the end portion side. Joint body having a tubular protrusion inserted into the inner surface of the pipe and provided with a packing accommodating recess on the outer peripheral surface, an annular elastic member attached to the inner side of the retaining device chamber, and the packing accommodating recess. An annular packing compression sleeve that is mounted and locked between the elastic member and the retaining member, a rubber packing that is mounted on the end side of the packing accommodating recess, and the packing compression sleeve and tape. A retaining device having a split groove that is engaged with the inner peripheral surface of the pad and is partly divided in the circumferential direction to prevent the connecting pipe from coming out, and the retaining device and packing for compression. Attach it with the sleeve, widen the width of the split groove of When the connection pipe is inserted into the receiving port, the groove expansion member is pushed by the pipe end surface. When it comes out of the fitting with the split groove, the retaining device is reduced in diameter, and the packing compression sleeve presses the retaining device against the taper inner surface, and at the same time, the rubber packing is pressed toward the end side and inside the packing accommodating recess. It is a plug-in type pipe joint characterized by being compressed by.

The dividing groove expanding member to be mounted in the groove expanding member chamber may be configured such that when the connecting pipe is inserted by a predetermined amount, the indicating portion rises and projects from the window. Also, attach the elastic member to the inner side of the retainer, press the retainer directly or through the packing compression sleeve toward the end side, insert the connecting pipe by a predetermined amount, and insert the groove. When the expanding member is disengaged from the fitting with the split groove of the retainer, the retainer can be reduced in diameter on the inner surface of the taper so that it can easily bite into the pipe. Further, by forming the groove expanding member with a resin or metal having appropriate rigidity and elasticity, elastic force acts when the groove expanding member is pressed by the pipe, and the groove expanding member acts as a retaining device. When it comes out of the split groove, the abutment surface of the groove expanding member presses the tube toward the end side, so that the retainer can be easily reduced in diameter on the inner surface of the taper. The split groove of the stopper is a fitting portion that fits with the groove expanding member in the expanded state,
By forming it wider than this fitting part and forming it in two steps with the width part wider than the width of the groove expanding member in the free state, the groove expanding member moves within the split groove length of the stopper. It is possible to disengage from the fitting portion and reduce the diameter of the stopper.

[0013]

Since the present invention has the above-described structure, the retainer is configured such that the split groove of the retainer is widened at the rear end portion of the groove expanding member until the pipe is inserted by a predetermined amount. The inner diameter is large. Therefore, even if the outer surface of the tip of the connecting pipe is not chamfered as before, and even if the connecting pipe is a soft resin pipe, the connecting pipe should be smoothly inserted into the fitting stopper inside the fitting body by the specified amount. Can be done.

When a predetermined amount of the connecting pipe is inserted into the pipe receiving port of the joint body, the groove expanding member is pressed toward the inner rear side by the end face of the pipe, and the retaining member is locked to the inner rear wall of the retaining device chamber, or Since only the groove expanding member moves inward by locking with the elastic member or the packing compression sleeve, the retaining member with the rear end of the groove expanding member locked It comes out of the fitting with the split groove. Therefore, when the width of the split groove of the retaining member is returned to the original free state, the inner diameter is reduced and it is locked to the outer surface of the connecting pipe. Therefore, the retaining member is engaged with the connecting pipe in the initial bite state, and when the pipe is about to be pulled out, the inner peripheral surface of the receiving taper surely engages the outer face of the pipe.

When the width of the split groove of the retainer is narrowed by inserting a predetermined amount of pipe and the diameter of the connecting pipe is reduced, the groove expanding member is compressed and an elastic force in the axial direction acts. Therefore, the contact surface of the groove expansion member with the pipe presses the pipe toward the end of the joint body, and the elastic member always presses the retainer toward the opening end. The tool is pressed against the inner peripheral surface of the taper. Therefore, even if a slight pull-out force acts on the pipe, the inner peripheral surface of the taper immediately reduces the diameter of the retainer to bite into the pipe and reliably prevent the pull-out of the pipe.

Further, when the connecting pipe is inserted by a predetermined amount, the groove expanding member is bent, so that the indicating portion projects from the window of the joint body. For this reason, the operator can confirm that the indicator has protruded to the outer surface of the joint, and the connection work can always be performed with the correct pipe inserted. When the retaining device is reduced in diameter by inserting a predetermined amount of pipe, the retaining member can be moved in the longitudinal direction between the reduced diameter and the inner peripheral surface of the taper. Presses the retaining device to the taper inner peripheral surface side of the end through the packing compression sleeve, and the end of the packing compression sleeve axially compresses the packing mounted in the packing accommodating recess and Seal between face and barrel.

From the above, the pipe can be easily inserted at the time of connection, and when the pipe is inserted by a predetermined amount, the retaining device engages with the pipe for initial biting, so that the pipe is about to be pulled out. In this case, the inner surface of the taper reliably prevents the pipe from pulling out. Further, if the pipe is not inserted by a predetermined amount, the pipe is not bited, so that there is no connection failure when the pipe is insufficiently inserted. After the tube is inserted, the stopper is pressed against the inner peripheral surface of the taper, so that even with a slight pulling force, the diameter of the stopper can be immediately reduced to reliably prevent the tube from pulling out. Further, since it is possible to confirm the insertion of the pipe, it is possible to prevent problems such as a leakage accident after the pipe due to a defective insertion of the pipe and a connection defect such as the pipe coming out. Further, since the packing mounted on the inner surface side of the pipe is compressed between the tube and the cylindrical portion, reliable sealing by the packing is performed.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Figure 1 Figure 2 shows the first embodiment,
FIG. 1 shows a state before inserting the tube, and FIG. 2 shows a state after inserting the tube. In the state of FIG. 1, the joint body 1 has an annular pipe receiving port 11 on the inner surface side of the open end. The inside of the pipe receiving port 11 is provided with a cylindrical projecting portion 13 having an O-ring 12 mounted on the outer peripheral surface thereof integrally with the main body 1, and when the connecting pipe 2 is inserted, it seals between the inner surface of the pipe 2. A plurality of annular protruding teeth may be provided on the outer peripheral surface of the cylindrical protruding portion 13 to seal the inner surface of the inserted tube 2.

A taper inner surface 15 for reducing the diameter of a retainer 3 to be described later is provided on the inner surface of the receiving port 11 on the side of the opening end as a retainer chamber 16, and the inside of the retainer chamber 16 is formed. The inner back wall 17 is formed in the portion so that the retaining member 3 is locked to the inner back wall 17 and is prevented from moving further toward the inner back side. A groove expanding member chamber 18 is formed inside the retaining device chamber 16 and a groove expanding member 4 to be described later is mounted therein. Further, in this embodiment, the pipe 2 inserted from the pipe receiving port 11 is inserted into the groove expanding member chamber 18.

As shown in FIG. 4, the stopper 3 is in the form of a sleeve having a slit groove 31 on a part of the circumference thereof, and the pipe 2 is provided on the inner surface thereof.
Is formed with a plurality of annular teeth 32 for cutting into the outer surface of the and blocking the tube 2. Further, the outer surface of the rear end is provided with a taper outer surface 33 that abuts on the taper inner surface 15 of the joint body 1. Further, the inner diameter of the annular tooth 32 of the retaining member 4 is formed smaller than the outer diameter of the connecting pipe 2 in the free state. Slit groove 3
In this embodiment, 1 has two stages, and the front slit groove 3
The groove expanding member 4 is fitted in the groove 5, and the rear slit groove 36 is a fitting step portion of the groove expanding member 4. In the free state of the retainer 4, the width of the slit groove 35 is narrower than the width of the groove expanding member 4, and when mounted on the joint body 1 as shown in FIG. 1, the inner diameter of the annular tooth 32 of the retainer 3 is The groove diameter enlarging member 4 is fitted in a state in which the width of the slit groove 35 is widened so as to be larger than the outer diameter of the connecting pipe 2.

The groove expanding member 4 is a single piece mounted from the groove expanding member chamber 18 of the joint body 1 to the retaining member chamber 16, and the front end 41 is locked to the inner wall of the groove expanding member chamber 18. To be done. The rear end portion 42 is fitted in the slit groove 35 of the stopper 3. A contact surface 43 for contacting the end surface of the pipe 2 is provided in the middle portion.
And a bent portion 44 that is compressed by inserting the tube.
The material is resin or steel having appropriate rigidity and elasticity.

When the pipe 2 is inserted into the pipe receiving port 11 of the joint body from the state shown in FIG. 1 by a predetermined amount, the groove expanding member 4 is pressed by the contact surface 43 with the pipe, and the bent portion 44 is previously bent to the outer surface side. Therefore, it is bent and compressed into the groove expanding member chamber 18. In this state, since the inner diameter of the retainer 3 is larger than the outer diameter of the tube 2, the tube 2 can be inserted smoothly. As shown in FIG. 2, since the retaining device 3 is locked to the inner back wall 17 of the retaining device chamber 16, only the groove expanding member 4 is compressed and moved inward, and as shown in FIG. , The stopper 3 is disengaged from the fitting with the slit groove 35. Therefore, the retainer 3 is reduced in diameter in an attempt to return to the original free state, and is locked so as to bite into the outer surface of the connecting pipe 2 inserted by a predetermined amount.

Therefore, since the above-mentioned initial biting of the retaining member 3 into the tube 2 is performed, even if pulling force is applied to the tube 2 after inserting the tube 2, the retaining tool by the taper inner surface 15 is retained. When the diameter of the pipe 2 is reduced, the pipe 2 is surely bited to prevent the pipe 2 from being pulled out. Further, after the pipe 2 is inserted, since the groove expanding member 4 is compressed, a force for pushing it toward the opening end side of the joint main body acts, and the end face of the pipe 2 and the front end of the retainer 3 are opened. Since the taper is pressed toward the side, the taper inner surface 15 of the main body and the taper outer surface 33 of the stopper 3 come into contact with each other. Therefore, even with a small pull-out force of the pipe, the inner diameter of the retaining member 3 is immediately reduced by the inner surface 15 of the taper, and the pull-out of the pipe 2 is reliably prevented.

FIGS. 3 to 7 show a second embodiment. FIG. 3 shows a state before loading the pipe, FIG. 5 shows a state after loading the pipe, and FIG. 6 shows a state after loading the pipe. Shows the state of being set to. In FIG. 3, the joint body 5 has an annular pipe receiving port 51 on the inner surface side of the opening end, and a tubular projecting portion 53 inside the pipe receiving port 51. When the tube 2 is inserted, the outer peripheral surface of the cylindrical protruding portion 53 and the tube 2
The O-ring seals between the inner peripheral surface and the inner peripheral surface. A taper inner surface 55 is provided on the inner surface of the pipe receiving port 51 to form a retaining tool chamber 56, and an inner back wall 57 is provided in the inner back portion.
An annular pipe end portion insertion chamber 59 is formed in the inner side of the retaining device chamber 56, and a groove expanding member chamber 58 provided in a part on the circumference of the joint body is provided in the inner side thereof. This groove expanding member chamber 58
A window 60 that opens to the outer surface of the joint body 5 is provided on the outer peripheral side.

The retainer 3 is the retainer 3 of the first embodiment.
Is the same as. The groove expanding member 7 is mounted from the groove expanding member chamber 58 to the retaining member chamber 56, and the front end portion 71 is locked to the inner wall of the groove expanding member chamber 58. The rear end portion 72 is fitted in the slit groove 35 of the stopper 3 as shown in FIG.
The intermediate portion has a contact surface 73 that comes into contact with the end of the tube and a bent portion 74 that is compressed by inserting the tube, and the bent portion 74 has an indicator portion 75. The material is made of a resin or a metal such as steel having an appropriate composition and elasticity.

When a predetermined amount of the pipe 2 is inserted into the pipe receiving port 51 of the joint body from the state shown in FIG. 3, the state shown in FIG. 5 is obtained. The groove expanding member 7 is pressed by the contact surface 73 with the tube, the bent portion 74 is bent and moved into the groove expanding member chamber 58, and the indicating portion 75 projects from the window 60. In this state, since the inner diameter of the retainer 3 is larger than the outer diameter of the tube 2, the tube 2 can be smoothly inserted. As shown in FIG. 5, since the retaining device 3 is locked to the inner back wall 57, only the groove expanding member 7 moves to the inner rear side, and the slit groove of the retaining device 3 as shown in FIG. It is disengaged from the fitting with 35, and retainer 3
Is locked so as to cut into the outer surface of the tube 2 inserted by a predetermined amount. In addition, the bending of the bending portion 74 causes the pointing portion 75 to move.
Since it projects from the window 60 of the joint body, it is possible to confirm the insertion state of whether or not the pipe has been inserted into the joint body by a predetermined amount.

After inserting the tube 2, when the tube 2 is set in the free state, the end face of the tube 2 and the front end face of the retainer 3 are moved by the elastic repulsive force due to the bending of the groove expanding member 7, as shown in FIG. The taper inner surface 55 of the main body and the taper outer surface 33 of the retainer come into contact with each other by pressing toward the open end side. Therefore, even if a small pull-out force or vibration of the pipe is applied, the diameter of the retaining member 3 is immediately reduced to surely bite into the pipe 2 to prevent the pipe from being pulled out. Even in this state, the indicator portion 75 of the groove expanding member 7 projects from the window 60, and it can be confirmed whether the pipe 2 is properly inserted or not. Further, since the indicator 75 tilts in the window 60 according to the inserted state of the tube 2, it is possible to know the pulled-out state of the tube 2 also by the tilt of the indicator 75.

FIG. 8 shows a third embodiment. This embodiment is substantially similar to the above embodiment, but is different in that the inner wall 17 of the first embodiment is not provided between the retaining chamber 86 of the joint body 8 and the groove expanding member chamber 88, and the groove expanding The point is that a coil spring 89 is mounted between the inner back wall 87 of the diameter member chamber 88 and the retaining member 3. The coil spring 89 constantly presses the retaining device 3 toward the taper inner surface 85 side of the retaining device chamber 16, and when the connecting pipe 2 is inserted into the receiving port 81, the groove expanding member 4 is pressed inward. The retaining device 3 is disengaged from the engagement with the slit groove 35 of the retaining device 3 by being locked by the elastic force of the coil spring 89. The retaining device 3 is constantly pressed against the inner surface 85 of the taper so that the retaining device 3 easily bites into the outer surface of the tube 2.

FIG. 9 shows a fourth embodiment. In this embodiment, the second embodiment and the third embodiment are generally combined, and the inner back wall of the pipe end insertion chamber 99 of the joint body 9 and the retaining device 3 are combined.
The rubber-like elastic body 90 is mounted between the and. As a result, the stopper 3 is pressed against the taper inner surface 95, and even if the groove expanding member 7 moves when the connecting pipe 2 is inserted, the stopper 3 is engaged by the elastic force of the rubber-like elastic body 90. When the stopper 3 is stopped, the diameter of the stopper 3 deviates from the fitting with the slit 35.

In each of the first to fourth embodiments, the cylindrical protrusions 13 and 5 to be inserted into the inner surface of the connecting pipe in the joint body are used.
Although the case where 3 and 83 are provided and the inner peripheral surface of the pipe 2 is sealed is shown, as in the fifth embodiment shown in FIG. 10, an annular O-ring groove is provided on the inner surface of the receiving port of the joint body 10 to provide the O-ring packing. It is also possible to mount 12 to seal between the inner surface of the joint body and the outer surface of the connecting pipe 2.

11 to 13 show the sixth embodiment. FIG. 11 shows a state before the tube is inserted and FIG. 12 shows a state after the tube is inserted. The inner surface of the pipe receiving port 101 has an outer peripheral surface on which an annular packing compression sleeve and a recess 10 for accommodating the packing are provided.
The cylindrical protruding portion 103 having the shape 2 is provided integrally with the main body 100, and the cylindrical protruding portion 103 is inserted into the inner surface of the connecting pipe 2 inserted into the receiving port 101. Packing accommodation recess 10
Two O-ring packings 110 are mounted on the end side of the packing 2, and a packing compression sleeve 120 is mounted on the back side of the packing 110. In addition, packing compression sleeve 12
At 0, a split groove is provided, which is partially divided in the circumferential direction, and the split groove is expanded and mounted in the packing accommodating recess 102.

The pipe receiving port 101 has a receiving member 104 fixed to the outer surface of the end of the main body 100 by being screwed integrally with the main body 100, and forms an inner peripheral surface 105 of the taper to prevent the retaining device chamber 10.
There are six. An annular elastic member chamber 107 is provided inside the retaining device chamber 106, and a coil spring 130 is attached thereto. 120 is an annular packing compression sleeve,
It is mounted in the packing accommodating recess 102 of the retaining device chamber 106. The flange 121 of the sleeve 120 is engaged with the coil spring 130 on the back side and with the retaining member 140 on the end side, and is constantly pressed toward the end side by the coil spring 130.
The cylindrical portion 122 of the sleeve 120 extends from the flange portion 121 to the end side and is mounted in the accommodation recess 102.

The stopper 140 is provided on the outer surface of the taper inner peripheral surface 10.
5, an outer surface 141 of the taper abutting against the inner peripheral surface of the taper 5 and a plurality of annular teeth 142 on the inner surface thereof are provided. Further, as shown in FIG. 13, a slit groove 143 is provided in a part of the circumference so that the diameter can be freely expanded or reduced.
The groove expanding member 150 is fitted in the groove 144 on the end side,
The taper inner peripheral surface 105 with the stopper 140 expanded
Is locked to. The groove 145 on the back side is formed to be larger than the width of the groove expanding member 150 and longer than the length of the groove expanding member 150. When the groove expanding member 150 is removed from the groove 144, the groove 145 on the inner side is loosened. It is supposed to be fitted. The groove expanding member 150 is an inverted L-shaped single piece, and has a portion 151 that fits into the groove 144 and a contact surface 152 that is pressed by the end surface of the tube 2.

As shown in FIG. 12, when the pipe 2 is inserted and the groove expansion member 150 is disengaged from the fitting of the groove 144 of the retaining member 140, the retaining device 140 is released from the regulation of the outer diameter. It is pressed toward the end side through the packing compression sleeve 120 by the force of 130, the diameter is reduced by the action of the taper inner peripheral surface 105, and it bites into the outer surface of the tube 2. Further stopper 1
Since the sleeve 120 is pressed toward the end portion by the amount of the reduced diameter 40 of the packing 120, the packing 110 is compressed in the packing accommodating recess. In this way, the packing for hermetically sealing the inner surface of the connecting pipe 2 is also compressed, so that the pipe 2 can be reliably sealed.

14 and 15 show a seventh embodiment in which the sixth embodiment is provided with an instruction portion 175 for confirming the insertion of the connecting pipe from the outside as in the second embodiment, before and after the pipe insertion. Is the state of. In this embodiment, by inserting a predetermined amount of pipe into the pipe receiving port, the pipe is prevented from coming off, the packing is compressed, and the pipe insertion confirmation instruction is given.

As described above, in the pipe joint of the present invention, the connecting pipe can be easily inserted into the joint body. Further, unless the insert is correctly inserted by a predetermined amount, the bite is not initially bited, so that there is no connection failure in the incompletely inserted state. When the pipe is correctly inserted by a predetermined amount, the initial bite locking to the pipe is surely performed, so that the inner surface of the taper reliably prevents the pipe from being pulled out. In addition, since the retainer is pressed against the inner peripheral surface of the taper, the retainer is reduced in diameter even with a small pull-out force or vibration of the pipe, so that it securely bites into the outer surface of the pipe and pulls out the pipe. Prevent. Moreover, since the insertion state of the pipe can be instructed, the connection work can be performed in the correct insertion state, and the insertion state of the pipe can be confirmed and checked even after the connection. Further, since the packing attached to the inner surface of the pipe can be compressed, the sealing with the connecting pipe is surely performed.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention before insertion of a tube.

FIG. 2 is a partial cross-sectional view after inserting the tube according to the first embodiment of the present invention.

FIG. 3 is a sectional view showing a second embodiment of the present invention before inserting a tube.

FIG. 4 is a perspective view showing a fitted state of the retaining device 3 and the groove expanding member 7 of FIG.

FIG. 5 is a partial cross-sectional view after inserting a tube according to a second embodiment of the present invention.

FIG. 6 is a partial cross-sectional view showing a state in which the tube after loading according to the second embodiment of the present invention is in a free state.

FIG. 7 is a perspective view showing the relationship between the retaining device 3 and the groove expanding member 7 of FIG.

FIG. 8 is a sectional view showing a third embodiment of the present invention before inserting a pipe.

FIG. 9 is a cross-sectional view showing a fourth embodiment of the present invention before inserting a pipe.

FIG. 10 is a cross-sectional view showing a fifth embodiment of the present invention after inserting a pipe.

FIG. 11 is a partial cross-sectional view of a sixth embodiment of the present invention before inserting a pipe.

FIG. 12 is a partial cross-sectional view showing a sixth embodiment of the present invention after the tube has been inserted.

FIG. 13 is a retaining device 140 and a groove expanding member 15 of FIG.
It is a figure which shows the fitting state with 0.

FIG. 14 is a partial cross-sectional view of a seventh embodiment of the present invention before inserting a pipe.

FIG. 15 is a partial cross-sectional view showing a seventh embodiment of the present invention after inserting a pipe.

FIG. 16 is a sectional view of a connection portion of a plug joint showing a conventional technique.

FIG. 17 is a sectional view of a connecting portion of a joint showing a conventional technique.

[Explanation of symbols]

1, 5, 10, 100 Joint body 2 Connection pipe 3,140 Detachment stopper 4,7,150 Groove expanding member 11, 51, 101 Pipe receiving port 12,110 O-ring packing 13, 53, 103 Cylindrical protrusion 14 , 54, 84 through-flow passages 15, 55, 85, 105 taper inner peripheral surface 16, 56, 86, 106 retaining device chamber 17, 57 inner back wall of retaining device chamber 18, 58, 88, 150 groove Expanding member chamber 31, 35, 36, 143, 144, 145 Cutting groove of retaining device 32 Annular tooth 33, 141 of retaining device Tape outer surface 41 of retaining device 41, 71 Front end of expanding member 42, 72 Rear end part of groove expanding member 43, 73, 152 Abutment surface with pipe 44, 74 Bending part of groove expanding member 75, 175 Indicator part of groove expanding member 59 Pipe end insertion chamber of joint body 60 Window of joint body 89, 130 Coil spr Grayed 90 flange portion 122 packing cylindrical portion of the compression sleeve of the rubber-like elastic body 120 packing compression sleeve 121 packing compression sleeve

Claims (4)

[Claims] 1. A retainer chamber having, on the inner surface side of the receiving end of the opening end, an inner peripheral surface of the taper whose diameter is gradually reduced toward the end and an inner rear wall for locking the retainer on the inner rear portion. And a joint body having a groove expanding member chamber in the inner depth of the retaining device chamber, and a part in the circumferential direction for mounting in the retaining device chamber to prevent the connecting pipe from coming out. And a rear end portion that is fitted into the groove expanding member chamber from the retaining device chamber to widen the width of the dividing groove of the retaining device and to be fitted to the middle portion. When the connection pipe is inserted into the receiving port, the contact surface of the groove expanding member is formed by inserting the connecting pipe into the receiving port. It is characterized in that it is pushed by the pipe end face and the rear end part comes out of the fitting with the split groove of the retainer, and the retainer is reduced in diameter and locked to the outer surface of the inserted connecting pipe. Plug-in type pipe fitting to be collected. 2. A retainer chamber having a taper inner peripheral surface on the inner surface side of the receiving end of the opening end, the diameter of which gradually decreases toward the end,
A joint body having a groove expanding member chamber in the inner depth of the retaining device chamber, and a part in the circumferential direction for mounting in the retaining device chamber to prevent the connecting pipe from coming off With a split groove, which has an inner diameter that is slightly smaller than the outer diameter of the connecting pipe in a free state, and is attached from the retaining device chamber to the groove expanding member chamber to widen the width of the dividing groove of the retaining device. A groove expanding member having a contact surface with a pipe that is pushed inward in the axial direction when the connecting pipe is inserted into a rear end portion and an intermediate portion that are fitted together, and a retaining member that is attached to the retaining device chamber and retains. When the connecting tube is inserted into the receiving port, the contact surface of the groove expanding member is pushed by the tube end surface, and the rear end portion of the retaining tool is Insertion characterized by being disengaged from the fitting with the split groove and reducing the inner diameter of the retainer to lock it on the outer surface of the inserted connecting pipe. Type pipe fittings. 3. A retainer chamber having a taper inner peripheral surface on the inner surface side of the receiving end of the opening end, the diameter of which gradually decreases toward the end,
A joint main body having a groove expanding member chamber inside the retaining member chamber and a window opening to the outer surface side of the groove expanding member chamber; In order to prevent the above, a retaining device provided with a dividing groove that is partially divided in the circumferential direction, and the retaining member chamber is attached to the groove expanding member chamber, and the width of the dividing groove of the retaining device is An abutting surface of the rear end portion which is expanded and fitted, and a pipe which is pushed inward in the axial direction by inserting the connecting pipe into the intermediate portion, and when the abutting surface is pushed by the insertion of the pipe, protrudes from the window A split groove diameter expanding member having an indicating portion for performing the insertion, and an elastic member that is installed in the retaining device chamber and presses the retaining device toward the opening end side. When the connecting pipe is inserted into the receiving port, the groove is formed. The abutting surface of the diameter-expanding member is pushed by the pipe end surface to be disengaged from the fitting with the split groove of the retainer, and the abutting surface of the fitting main body from the window. A plug-in type pipe joint characterized in that the indicator is projected. 4. A retaining device chamber having a taper inner peripheral surface on the inner surface of the receiving end of the opening end portion, the diameter of which is gradually reduced toward the end, and from the inner back portion to the end portion of the retaining device chamber. To the inner surface of the pipe and a cylindrical protrusion having an outer peripheral surface provided with a packing accommodating recess, an annular elastic member attached to the inner side of the retaining device chamber, and the packing accommodating member. An annular packing compression sleeve that is mounted in the recess and locked between the elastic member and the retaining member; a rubber packing that is mounted on the end side of the packing accommodating recess; and the packing compression sleeve. A retainer attached to the inner peripheral surface of the taper and having a split groove that is partially cut in the circumferential direction to prevent the connecting pipe from coming out, and the retainer and the packing. Install it between the compression sleeve and widen the split groove of the stopper to fit it. It is composed of a split groove expanding member having a contact portion with a pipe pushed inward in the axial direction by the insertion of the connecting pipe, and when the connecting pipe is inserted into the receiving port, the groove expanding member is pushed by the pipe end surface. The fitting retaining member is reduced in diameter and the packing compression sleeve presses the fitting preventing member against the inner surface of the taper, and the rubber packing is pressed toward the end portion to accommodate the packing accommodating recess. A plug-in type pipe fitting that is characterized by being internally compressed.