JPH09292070A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily connect pipes. SOLUTION: An inner cylinder 22 is installed inside a joint body 11. A holding piece 28 is formed on the inner cylinder 22. Tapered fastening surfaces 16, 30 are formed on the joint body 11 and the holding piece 28. A biting projection 31 is formed on the holding piece 28. When a pipe P is inserted and pulled slightly, the holding piece 28 is displaced in a diameter-reducing direction by the engagement of the fastening surfaces 16, 30. The biting projection 31 bites into an outer periphery of the pipe P which is then held and regulated in removal. Operability is improved compared to the case that a nut is screwed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for connecting pipes used for piping of water supply facilities in houses.

[0002]

2. Description of the Related Art When a pipe for supplying hot water to a kitchen or a bathroom or a pipe for circulating hot water for floor heating is installed in a house, the pipe is connected to a water source pipe or a water heater. Do the work. At this time, a pipe joint is previously attached to the water supply source pipe and the water heater, and the pipe is connected to the pipe joint.

Conventionally, the pipe joint shown in FIG. 20 has been used. In this pipe joint, a male screw portion 2 on the left side of the joint body 1 in the drawing is connected in advance to a water supply source pipe or a water heater (not shown), and a C-shaped tightening ring 4 capable of reducing its diameter by a slit 4B. Nut 3 and pipe 5
And the end portion of the pipe 5 is fitted into the pipe fitting portion 6 of the joint body 1, and the tightening ring 4 and the nut 3 are moved to the joint body 1 side to move the nut 3 to the male thread portion on the right side of the joint body 1. The connection work is carried out by the procedure of screwing with 7.

When the nut 3 is tightened, the tightening ring 4
The tapered surfaces 4A and 4A on both sides of the are the tapered surfaces 1 of the joint body 1.
A is sandwiched in the axial direction between A and the tapered surface 3A of the nut 3, and the tightening ring 4 is contracted and deformed by the inclination of these tapered surfaces 1A, 3A, 4A. As a result, the pipe 5 is tightened and connected in a state in which its removal is restricted.

[0005]

However, since the conventional pipe joint requires troublesome work such as penetrating the pipe 5 into the tightening ring 4 and the nut 3 and screwing the nut 3, the workability is low. It had the drawback of being bad.

Further, since the pipe 5 is prevented from coming off by the frictional force between the tightening ring 4 and the pipe 5 and the frictional force between the pipe 5 and the pipe fitting portion 6, the pipe 5 is prevented from coming off. There was also a problem that the reliability of the function was low. Further, since the waterproof structure at the connecting portion between the joint body 1 and the pipe 5 is configured such that the pipe 5 having a relatively high rigidity is brought into close contact with the pipe fitting portion 6 by the tightening force of the tightening ring 4, the sealing property is improved. There is also a problem that the reliability of waterproofing is low because the water is low, and if hot water leaks to the outer peripheral side of the pipe 5, it easily flows out through the slit 4B of the tightening ring 4.

Furthermore, since a valve device for opening and closing the fluid supply path is provided separately from the pipe joint,
It is necessary to connect the valve device to the pipe,
There is also a problem that the number of connecting steps is large and the workability is poor. The present invention was created in view of the above circumstances, and an object thereof is to improve workability when connecting pipes. In addition to the above, it is also intended to improve the pipe retaining function, the sealing property, or the workability of the valve device.

[0008]

According to the invention of claim 1, there is provided a joint main body having a tubular shape, and an inner cylinder fitted in the joint main body so as to be displaceable in the axial direction so that a pipe can be inserted. The inner cylinder is provided with a radially displaceable holding piece, and the outer circumference of the holding piece and the inner circumference of the joint body are moved along with the movement of the inner cylinder in the pipe withdrawing direction. A tapered tightening portion is formed which can abut and at least one of which is reduced in diameter in the pipe withdrawing direction, and the inner periphery of the holding piece is angled like a wedge with the outer periphery of the pipe. The feature is that the biting protrusions are formed.

According to a second aspect of the present invention, there is provided a joint body having a tubular shape, and an inner cylinder fitted to the joint body so as to be displaceable in the axial direction so that a pipe can be inserted. A holding piece that can be displaced in the radial direction is formed on the
The outer periphery of the holding piece and the inner periphery of the joint body can be brought into contact with each other as the inner cylinder moves in the pipe withdrawing direction, and at least one of them has a tapered shape whose diameter decreases in the pipe withdrawing direction. It is characterized in that a tightening portion is formed, and further, seal members which can be elastically pressed against the outer circumference of the pipe are provided at two positions spaced apart in the inserting / removing direction of the pipe.

According to the third aspect of the present invention, there is provided a joint main body having a tubular shape, and an inner cylinder fitted in the joint main body so as to be displaceable in the axial direction so that the pipe can be inserted. A holding piece that can be displaced in the radial direction is formed on the
The outer periphery of the holding piece and the inner periphery of the joint body can be brought into contact with each other as the inner cylinder moves in the pipe withdrawing direction, and at least one of them has a tapered shape whose diameter decreases in the pipe withdrawing direction. The joint body is provided with a spherical valve body with a through hole formed therein, and the joint body is provided with a spherical valve body, and the rotation of the valve body causes the through hole to communicate with the flow passage in the joint body. It is characterized in that a ball valve mechanism that changes between a closed state that shuts off the passage and a closed state is provided.

The invention according to claim 4 is the invention according to claims 1 to 3.
In any one of the inventions, a taper-shaped seal for abutting a connecting end of a tubular connecting member which is connected while being drawn in the axial direction, at a connecting port on the side opposite to the insertion side of the pipe in the joint body. It is characterized in that the surface is formed. The invention of claim 5 is the invention according to any one of claims 1 to 4, wherein the joint body is
It is characterized in that a diameter expanding means is provided for abutting the holding pieces displaced in the pipe insertion direction from the abutting positions of the tightening portions so as to perform a diameter expansion displacement.

[0012] The invention of claim 6 is from claim 1 to claim 5.
In any one of the inventions, the joint body has a holding cylinder that holds the pipe, a connecting cylinder that enables connection with a mating tubular member on the side opposite to the insertion side of the pipe, and the holding cylinder. And a connecting mechanism for connecting the connecting cylinder and the swinging body so that they can be displaced relative to each other.

[0013]

According to the invention of claim 1, when the end portion of the pipe is inserted into the inner cylinder until it penetrates into the holding piece and then the pipe is pulled back in the pulling direction,
Due to the taper of the tightening portion, the holding piece is displaced in the diameter reducing direction to tighten the pipe and hold it. At this time, the biting protrusion bites into the outer periphery of the pipe, so that the movement of the pipe in the inserting / removing direction is restricted. When connecting the pipes, it is only necessary to insert the pipes and pull them back. Moreover, since the wedge-shaped biting protrusions bite into the connected pipe, the pipe is prevented from coming off with excellent reliability.

According to the second aspect of the present invention, when the end portion of the pipe is inserted into the inner cylinder until it penetrates into the holding piece and then the pipe is pulled back in the pulling direction, the holding piece is contracted due to the taper of the tightening portion. It is displaced in the radial direction and clamps and holds the pipe. In such a state where the pipes are connected, the two seal members are pressed against the outer circumferences of the pipes, so that the pipe joint and the pipes are sealed. When connecting the pipes, it is only necessary to insert the pipes and pull them back. Further, since a seal member that elastically presses against the pipe is provided, high sealing performance can be obtained, and since this seal member is provided at two positions spaced in the pipe insertion / removal direction, the sealing function is achieved. Is highly reliable.

According to the third aspect of the present invention, when the end portion of the pipe is inserted into the inner cylinder until it penetrates into the holding piece and then the pipe is pulled back in the pulling direction, the holding piece is contracted due to the taper of the tightening portion. It is displaced in the radial direction and clamps and holds the pipe. Further, when the valve body of the ball valve mechanism is opened, the fluid can flow through the flow passage and the through hole, and when the valve body is closed, the fluid is cut off. The work of connecting the pipes is excellent because it is only necessary to insert the pipes and pull them back. Further, since the pipe joint of the present invention has a valve function in itself, compared to the case where a valve device different from the pipe joint is provided in the middle of the fluid flow path, the number of steps in piping / connection work is reduced. It is possible to reduce the cost, reduce the cost, and save the space.

In the invention of claim 4, since the connecting end of the tubular connecting member abuts the pipe-shaped sealing surface, the degree of close contact is increased. Since the tapered sealing surface is provided at the connecting portion between the joint body and the tubular connecting member, higher sealing performance can be obtained as compared with the structure in which the end surfaces orthogonal to the axial direction are abutted against each other. In the invention of claim 5, when the pipe penetrates the holding piece, since the holding piece is displaced in the pipe inserting direction from the abutting position of the tightening portions to be expanded in diameter. Moreover, the holding piece is not in contact with the outer circumference of the pipe. Also, when pulling out the pipe,
The holding piece is not in contact with the pipe until the pipe is completely removed from the holding piece due to the diametrical displacement of the holding piece. Therefore, the pipe is prevented from being scratched by being rubbed by the holding piece when the pipe is inserted or removed.

According to the sixth aspect of the invention, when the pipe is attached to the joint body or when the pipe is bent, if the pipe having a bending tendency is extended or the pipe is forcibly bent, the pipe is restored by its own restoring force. Try to change the direction of the axis with respect to the body. Then, since the pipe and the holding cylinder are integrally displaced relative to each other so as to swing around the connection cylinder, the holding cylinder and the pipe are not displaced so as to be relatively inclined. Therefore, in the holding cylinder, it is possible to prevent the deterioration of the sealing property due to the inclination of the pipe.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

<First Embodiment> A first embodiment of the present invention will be described below with reference to FIGS. The pipe joint 10 of the present embodiment supplies water or hot water to a kitchen, a bathroom, a washroom, etc. through a pipe from a water source pipe or a water heater in a house, or supplies hot water to a hot water pipe stretched for floor heating. It is used as a plumbing facility around the water. The pipe joint 10 includes a joint body 11 and an inner cylinder 22.

The joint body 11 is made of metal and has a cylindrical shape as a whole. A jig fitting portion 12 having a hexagonal cross section is formed on the left side portion of the outer circumference of the joint body 11, and a male screw portion 13 is formed on the right side portion of the outer circumference. The fitting main body 11 has a jig fitted to the jig fitting portion 12, and a male screw portion 13 is screwed into a female screw portion of a feeding device (not shown) such as a water source pipe, a water heater, etc. It is installed in advance.

The left side portion of the inner circumference of the joint body 11 in the figure is an inner cylinder accommodating portion 14. This inner cylinder accommodating portion 14
A guide surface 15 having a tapered shape is formed at the innermost end of the taper so as to reduce its diameter toward the right side of the drawing. The guide surface 15 functions to smoothly perform the fitting operation of the inner cylinder 22 as described later. On the right side of the guide surface 15, a tightening surface having a tapered shape whose diameter is reduced toward the left side of the drawing (the direction of pulling out the pipe P described later) in the opposite direction to the guide surface 15 (which is a component of the present invention). A certain tightening portion) 16 is formed. The tightening surface 16 cooperates with a tightening surface 30 of the inner cylinder 22, which will be described later, to reduce the diameter of the holding piece 28 and hold the pipe P.

A seal accommodating portion 17 is formed on the right side of the tightening surface 16, and the seal accommodating portion 17 includes a seal ring made of a material such as rubber that can be easily elastically deformed. The seal member 18 is attached. A pipe receiving portion 19 for receiving the tip end portion of the pipe P inserted from the left side of the joint body 11 is formed on the right side of the seal accommodating portion 17, and the inner side of the pipe receiving portion 19 (in the figure). A stopper surface 20 with which the tip end surface of the pipe P can abut is formed at the end portion on the right side).

Further, a portion on the right side of the pipe receiving portion 19 is a flow passage 21 which opens to the right end surface of the joint body 11 and allows water and hot water to flow therethrough. The inner cylinder 22 is made of metal like the joint body 11 and has a cylindrical shape as a whole. On the outer circumference of the inner cylinder 22, a flange portion 23 is formed at a rear end portion (an end portion on the left side in the drawing), and the flange portion 2 is formed.
A seal groove 24 is formed closer to the tip side than 3, and a seal ring 25 made of a material such as rubber that can be easily elastically deformed is fitted in the seal groove 24. further,
A seal groove 26 is also formed on the inner circumference of the inner cylinder 22, and a seal ring (seal member which is a constituent feature of the present invention) 27 made of a material such as rubber that can be easily elastically deformed is formed in the seal groove 26. Is fitted.

The outer diameter of the inner cylinder 22 is smaller than that of the seal groove 24 on the outer peripheral side thereof.
A plurality of holding pieces 28 are formed by forming slits in the axial direction from the tip surface. The holding piece 28 extends in a cantilever manner with the tip side (right side in the drawing) as a free end,
It is possible to bend and deform in the radial direction. A protrusion 29 is formed on the outer periphery of the tip of the holding piece 28.
A fastening surface 30 (a fastening portion which is a constituent feature of the present invention) 30 capable of engaging with the fastening surface 16 of the joint body 11 is formed on the member 9. The inclination angle formed by the tightening surface 30 of the inner cylinder 22 with respect to the pipe insertion / extraction direction is determined by the joint body 1
It is set to be larger than the inclination angle of the first tightening surface 16.

A biting protrusion 31 is formed on the inner circumference of the tip of the holding piece 28. This biting protrusion 31
As shown in an enlarged view in FIG. 3, each has a wedge shape that is sharply angled toward the center side, and cuts into the outer periphery of the pipe P so as to restrict the movement of the pipe P in the axial direction. It has become. The above-mentioned inner cylinder 22 is assembled by inserting it into the inner cylinder accommodating portion 14 from the left side of the joint body 11. When the inner cylinder 22 is inserted, the projection 29 at the tip of the holding piece 28 comes into contact with the guide surface 15 and is guided toward the center side by its inclination, so that the holding piece 2
After elastically contracting and deforming the diameter of 8, it passes through the minimum diameter portion of the guide surface 15 and then enters the area where the tightening surface 16 is formed. Along with this, the holding piece 28 elastically returns in the radial expansion direction, so that the tightening surface 30 of the protrusion 29 and the tightening surface 16 of the joint main body 11 can be engaged in the axial direction, and thus the inner cylinder 22 is restricted from coming off. It is assembled to the joint body 11 in the closed state. In the assembled state, the inner cylinder 22 can move relative to the joint body 11 in the axial direction within a certain range.

Next, the operation of the present embodiment will be described. When connecting the pipe P to the pipe joint 10 assembled as described above, from the left side of the pipe joint 10 to the inner cylinder 2
It suffices to insert the pipe P into the inside of 2. Pipe P
In the initial stage of the inserting operation of (1), since the tip of the pipe P contacts the biting protrusion 31, the inner cylinder 22 is pushed rightward together with the pipe P. Then, when the flange portion 23 hits the left end surface of the joint body 11 and the movement of the inner cylinder 22 is restricted, the pipe P is accommodated in the pipe receiving portion 19 while pushing the holding piece 28 outward and continuing to enter.

When the pipe P hits the stopper surface 20 and cannot be further inserted, the pipe P is pulled back in the pulling direction. Then, since the tightening surface 30 of the protrusion 29 engages with the tightening surface 16 of the joint body 11, the holding piece 28 is forcibly displaced in the radial contraction direction, and as shown in an enlarged view in FIG. Biting protrusion 3
1 penetrates deeply into the outer periphery of the pipe P. During this time, the inner cylinder 22 moves integrally with the pipe P, but when the bite is maximized and the movement of the inner cylinder 2 is restricted, the pipe P is further moved.
The pull-back operation is disabled and the connection work of the pipe P is completed.

In this state, since the movement of the pipe P in the inserting / removing direction with respect to the inner cylinder 22 is restricted by the deep biting of the biting protrusion 31, the pipe P is held in a state where it cannot be pulled out. Further, the seal ring 18 fitted to the joint body 11 and the seal ring 27 fitted to the inner cylinder 22 are elastically abutted on the outer periphery of the pipe P, whereby the inner portions of the joint body 11 and the inner cylinder 22 are Waterproof between the circumference and the outer circumference of the pipe P is achieved. Water / hot water supplied from the water source pipe / water heater flows into the pipe P connected in this way through the flow passage 21 of the joint body 11.

As described above, the present embodiment is excellent in workability because it is only necessary to insert the pipe P and slightly pull it back when connecting the pipe P. Moreover, since the wedge-shaped biting protrusions 31 bite into the connected pipes P, the function of preventing the pipe P from coming off is excellent in reliability. Further, since the seal rings 18 and 27 that elastically press against the pipe P are provided, high sealing performance can be obtained, and the seal rings 18 and 27 are located at two positions spaced apart in the inserting and removing direction of the pipe P. Since it is provided, the sealing function is excellent in reliability.

When the faucet to which water or hot water is supplied is suddenly closed, the pipe P may slightly move in the direction of coming out of the pipe joint 10. However, even in such a case,
As shown in FIG. 4, the tip of the pipe P has a pipe receiving portion 1
It remains inside 9 and cannot come off from the seal ring 18 of the joint body 11. Therefore, the double sealing function of the two seal rings 18 and 27 is not impaired, and high waterproofness can be maintained.

<Second Embodiment> Next, a second preferred embodiment of the present invention will be described with reference to FIGS. The pipe joint 40 of the present embodiment is different from the pipe joint 10 of Embodiment 1 in the connection structure with the water source pipe or the water heater. Other configurations are the same as those of the first embodiment, and thus the same configurations are denoted by the same reference numerals.
The description of the structure, operation and effect is omitted. At the right end of the joint body 41 in the drawing, a connecting cylinder portion 42 is formed so as to extend. A nut 43 is fitted in the connecting cylinder portion 42 so as to be movable in the axial direction, and a metal stopper ring 45 is mounted in a ring groove 44 formed on the outer periphery of the distal end of the connecting cylinder portion 42. The stopper ring 45 protrudes from the outer peripheral surface of the connecting tubular portion 42 and regulates the removal of the nut 43.

The connecting port 46 at the tip of the connecting tubular portion 42 has a tapered sealing surface 47 which spreads outward along the edge of the connecting port 46.
Are formed. A water source pipe or a tubular connection member A of a water heater is connected to the connection port 46,
A tapered seal surface B that matches the seal surface 47 is formed on the tip end surface of the tubular connecting member A. Further, on the outer circumference of the tubular connecting member A, a male screw portion C capable of engaging with the female screw portion 48 of the nut 43 is formed.

When the pipe joint 40 of the present embodiment is attached to the water source pipe or the water heater, the nut 43 is screwed into the male screw portion C with the connecting port facing the tip of the tubular connecting member A.
As the screwing progresses, the pipe joint 40 is drawn toward the tubular connecting member A, and finally the nut 43 comes into contact with the stopper ring 45 and the sealing surfaces 47 and B come into close contact with each other. The installation is completed as described above. Further, according to the present embodiment, since the tapered seal surfaces 47 and B are brought into close contact with each other at the connecting portion between the tubular connecting member A and the pipe joint 40, it is high without providing a separate sealing member. Water resistance can be obtained.

<Third Embodiment> Next, a third embodiment of the present invention will be described with reference to FIGS. The pipe joint 50 of the present embodiment is the pipe joint 10 of the first embodiment provided with a ball valve mechanism 57. Other configurations are the same as those in the first embodiment, and thus the same configurations are denoted by the same reference numerals, and description of the structures, operations, and effects will be omitted. A tubular portion 52 extending rightward in the drawing is formed on the joint body 51, and a male screw portion 53 for connecting to a water source pipe or a water heater is formed on the outer periphery of the distal end portion of the tubular portion 52.
Are formed. Female screw portion 5 on the inner circumference of the tip of the tubular portion 52
A cylindrical stopper 55 is screwed into the shaft 4, and the stopper 55 positions a valve body 58 and a valve seat 59 of a ball valve mechanism 57, which will be described later, at predetermined positions. The hollow portion of the stopper 55 serves as a flow passage 56 that communicates with the flow passage 21 of the joint body 51 via a ball valve mechanism 57.

The ball valve mechanism 57 includes a valve body 58 and a valve seat 5.
9 and is housed in the valve housing chamber 60. The valve seat 59 is composed of two parts, and has a hemispherical concave portion 61 for guiding the valve body 58 and the flow passages 21, 5.
6 has a valve opening 62 that opens in correspondence with 6. The valve body 58 is
Through hole 6 which is spherical as a whole and can be aligned with the valve opening 62
3 When assembling the valve element 58 and the valve seat 59, first one valve seat 59 is inserted into the valve accommodating chamber 60 from the right side of the drawing, then the valve element 58 is inserted, and the other valve seat 59 is inserted. Is accommodated, and finally the stopper 55 is screwed,
Work in the procedure.

Further, in the joint body 51, the valve accommodating chamber 6
A shaft hole 64 communicating from 0 to the upper surface of the tubular portion 52 in the drawing.
Are formed. An operation shaft 66 having an O-ring 65 mounted therein is housed in the shaft hole 64, and the lower end of the operation shaft 66 is fitted to the valve body 58 so as to be integrally rotatable. Operation axis 6
The upper end of 6 slightly projects from the outer surface of the tubular portion 52,
A jig fitting portion 67 for fitting a jig (not shown) such as a flat-blade screwdriver is formed on the protruding end surface. A jig is fitted in the jig fitting portion 67 so that the operating shaft 66 is
When rotated at an angle of 0 °, the valve body 58 causes the through holes 63 to pass through the valve openings 62 and the flow passages 21 and 5 as shown in FIG.
6, and the through-hole 6 as shown in FIG.
When 3 is turned sideways, the valve opening 62 is closed and the valve is displaced between a closed state in which both flow passages 21 and 56 are isolated. When the valve is open, the flow passages 21 and 56, the valve opening 62
Also, water and hot water can flow through the through holes 63, and the flow of fluid is blocked when the valve is closed.

As described above, the pipe joint 50 of this embodiment.
Has its own ball valve function 57,
Compared to the case where a valve device is provided separately from the pipe joint in the middle of the fluid flow path, the number of steps for piping and connecting work can be reduced, and cost and space can be saved. is there. <Fourth Embodiment> Next, a fourth embodiment of the present invention will be described with reference to FIGS. The pipe joint of the fourth embodiment has a configuration in which the pipe joint of the first embodiment is provided with a diameter expanding means and the seal structure is partially changed. Since the other configurations are the same as those in the first embodiment, the description of the structure, the action, and the effect of the same configuration will be omitted. The pipe joint 70 according to the fourth embodiment includes a joint body 71 and an inner cylinder 85. Similar to the first embodiment, the joint body 71 includes a jig fitting portion 72 having a hexagonal cross section, a male screw portion 73, and an inner cylinder housing portion 7.
4, a tapered guide surface 75, a tightening surface (a tightening portion that is a constituent of the present invention) 76, a pipe receiving portion 77, and a stopper surface 78.

On the inner circumference of the joint body 71 of the fourth embodiment,
Further, a seal ring 79 that can be closely attached to the outer circumference of the inner cylinder 85
Is accommodated and provided in the seal groove 80, and a seal ring (a seal member which is a constituent feature of the present invention) 81 which can be brought into close contact with the outer periphery of the distal end portion of the pipe P is accommodated and provided in the seal groove 82. Further, a diametrical expansion ring (diametrical expansion means which is a constituent feature of the present invention) 83 is press-fitted to a position adjacent to the left of the seal groove 82 in the drawing.
The expanded ring 83 slightly protrudes to the left in the drawing so as to correspond to the holding piece 87, and the outer periphery of the protruding end portion is in contact with the guide surface 87D of the holding piece 87, which will be described later.
A, and the inner circumference of the protruding end portion is an arc-shaped guide portion 83B for avoiding hitting of the tip edge of the pipe P.

Further, a guide pipe 84 which is fitted to the inner periphery of the inserted pipe P without backlash is attached to the inner periphery of the joint body 71 by press fitting. The guide pipe 84 is provided over a region reaching the end of the pipe joint 70 on the insertion side of the pipe P. Inner cylinder 85
Similar to the first embodiment, has a flange portion 86 and a holding piece 87, and the holding piece 87 has a protrusion 87A, a tightening surface (a tightening portion which is a constituent of the present invention) 87B, and a wedge-shaped biting projection 87C. Are formed. Furthermore, in the present embodiment, the tip side surface of the biting protrusion 87C has a tapered guide surface 87.
D and the guide surface 87D is the enlarged ring 8
It is possible to make contact with the contact portion 83A of No. 3. Here, the positional relationship between the guide surface 87D and the contact portion 83A will be described. When the holding piece 87 is at the position where the fastening surfaces 76 and 87B contact each other, the guide surface 87D contacts the contact portion 83A.
Although it is separated from A in the axial direction, when the holding piece 87 is axially displaced from this position in the pipe insertion direction (right direction in the drawing), the guide surface 87D engages with the contact portion 83A. ing. In addition, a seal ring (a seal member which is a constituent of the present invention) 88 that can be brought into close contact with the outer peripheral surface of the pipe P is provided on the inner periphery of the inner cylinder 85 in a seal groove 89.

Next, the operation of the present embodiment will be described. When the pipe P is inserted into the pipe joint 70 from the left side of the drawing, the tip of the pipe P abuts the biting protrusion 87C and frictional resistance between the outer periphery of the pipe P and the seal ring 88 at the initial stage of insertion causes The cylinder 85 and the pipe P move almost right together with the pipe P. When the guide surface 87D at the tip of the holding piece 87 is pressed against the contact portion 83A of the expanded ring 83, as shown in FIG.
The holding piece 87 is expanded and displaced by the inclination of D, and the biting protrusion 87C of the holding piece 87 is brought into non-contact with the outer peripheral surface of the pipe P. At this time, the pushing of the holding piece 87 by the pipe P is released, but the inner cylinder 85 is restricted from returning to the left side in the figure due to the frictional resistance between the seal ring 88 and the pipe P. It is held in a displaced state.
During this period, the tip of the pipe P penetrates the holding piece 87,
At this time, since the outer peripheral surface of the pipe P is not scratched by being rubbed by the biting protrusion 87C, the tip portion of the pipe P and the seal ring 81 are reliably sealed.

When removing the pipe P, the inner cylinder 8
5 is pushed into the joint body 71 and the holding piece 87 is applied to the expanding ring 83 to be expanded and deformed, and when the pipe P is pulled out in this state, the outer peripheral surface of the pipe P does not come into contact with the biting protrusion 87C and the holding piece 87 Extracted from 87. As mentioned above,
According to the fourth embodiment, since the pipe P can be inserted and removed without contacting the holding piece 87, it is possible to prevent the outer peripheral surface of the pipe P from being scratched by being rubbed by the biting protrusion 87C.

Further, the pipe P inserted in the pipe joint 70
Since the guide pipe 84 is fitted inside the pipe, even if a bending force acts on the portion of the pipe P extending outside the pipe joint 70, the portion of the pipe P inserted into the pipe joint 70 bends. There is no need to be. Therefore, there is no possibility that a gap will be formed between the outer periphery of the pipe P and the seal rings 81 and 88, and a reliable sealing function is exhibited. In addition, a seal ring 79, which is a seal member between the joint body 71 and the inner cylinder 85,
Since the seal ring 78 and the seal ring 88 on the inner circumference of the inner cylinder 85 can be arranged at substantially the same position in the axial direction, since the seal ring 78 is provided on the inner circumference of the joint body 71 rather than the outer circumference of the inner cylinder 85. Thus, the length of the inner cylinder 85 is shortened.

Further, since the arc-shaped guide portion 83B is provided on the inner circumference of the diameter-expanding ring 83, the tip of the pipe P is caught by the diameter-expanding ring 83 when the pipe P is inserted, which hinders the insertion. That is prevented. <Fifth Embodiment> Next, a fifth embodiment of the present invention will be described with reference to FIGS. The pipe joint 90 of the fifth embodiment has a configuration in which a part of the joint body 71 of the fourth embodiment is changed. That is, the joint body 91 of the fifth embodiment
Is composed of a holding cylinder 92, a connecting cylinder 93, and a connecting mechanism 94 that connects the two cylinders 92, 93 so that their axes are continuous.

The holding cylinder 92 is provided with a mechanism / member excluding the male screw portion 73 and the guide pipe 84 of the fourth embodiment. Therefore, the same reference numerals are given to the same mechanism / member, and the description of the structure / action / effect will be omitted. Now, the pipe of the holding cylinder 92 (not shown in FIGS. 14 and 15)
On the side opposite to the insertion side of P, a spherical connecting portion 95 is provided instead of the male screw portion 73 of the fourth embodiment. The spherical connecting portion 95 has a neck portion 95A extending in a cylindrical shape coaxial with the pipe P.
And a spherical portion 95B integrally formed at the tip of the neck portion 95A and having a spherical outer surface. The diameter of the spherical portion 95B is larger than the outer diameter of the neck portion 95A. The spherical connecting portion 95 constitutes a connecting mechanism which is a constituent feature of the present invention.

A male screw portion 96 for connecting a mating tubular member (not shown) is formed on the outer periphery of the end of the connecting cylinder 93 opposite to the holding cylinder 92. Further, the inner circumference opening on the side opposite to the male screw portion 96 is a housing chamber 97 for housing a coupling mechanism described later. A female screw portion 98 is formed near the opening in the accommodation chamber 97. As shown in FIG. 15, the connecting mechanism includes an O-ring 100 that comes into close contact with the rear end surface of the storage chamber 97, a ring-shaped sheet member 101 having a ring groove 102 for mounting the O-ring 100, and an inner circumference of the storage chamber 97. The spherical portion 9
It is composed of an O-ring 103 that is in close contact with the outer surface of 5B, a semicircular lock member 104 that is divided in two in the radial direction, and a lock nut 105 that is attached to the opening of the accommodation chamber 97. The sheet member 101 is made of a synthetic resin material such as a fluororesin or a synthetic rubber material, and has a tapered seat surface 101A that is in close contact with the spherical portion 95B. The lock member 104 has a pressing surface 104A that is tapered in the opposite direction to the sheet member 101 and is in close contact with the spherical portion 95B. The lock nut 105 has a hexagonal outer periphery, a male screw portion 105A is formed on the outer periphery, and a step surface 105B for pressing the lock member 104 to the inner side of the accommodation chamber 97 is formed on the inner periphery. ing.

When the holding cylinder 91 and the connecting cylinder 93 are assembled, the O-ring 100, the sheet member 101, and the O-ring 103 are housed in the housing chamber 97 in that order, and then the housing chamber 9 is placed.
7, the spherical connecting portion 95 is inserted, the spherical portion 95B is brought into close contact with the seat surface 101A, and then the lock member 104 which is divided into two is fitted so as to come into close contact with the spherical portion 95B. Finally, the male part of the lock nut 105 is fitted. The screw portion 105A is accommodated in the housing
The female screw portion 98 of 7 is screwed and tightened. Then, the tip end surface of the lock nut 105 pushes the lock member 104 axially inward, and the lock member 104 pushes the O-ring 103 and the spherical portion 95B axially inward as well. The assembly is completed as described above.

In the assembled state, the holding cylinder 92 and the connecting cylinder 93 are connected to each other so as to allow a swinging relative displacement so that the axis of the holding cylinder 92 is inclined. When swinging, both axes intersect at the center of the spherical portion 95B. At this time, since the state in which the seat surface 101A and the O-ring 103 are in close contact with the spherical outer surface of the spherical portion 95B is maintained, the waterproof state is maintained even when the swing displacement occurs. Further, since the O-rings 103 and 100 are also in close contact with the inner peripheral surface and the rear end surface of the accommodation chamber 97, the waterproof function on the inner periphery of the accommodation chamber 97 is also exerted.

As described above, in the fifth embodiment, the pipe P
A holding cylinder 92 to which is attached and held integrally;
Since the connecting tubular body 93 connected to the mating tubular member (not shown) on the side opposite to the pipe P is connected so as to be capable of relative displacement in a swinging manner, the following action / effective. That is, when the pipe P is made of synthetic resin, it has flexibility, but if it remains in a constant shape for a long period of time, it tends to maintain its shape. Therefore, when attaching the pipe P to the holding cylinder 92,
In the case where the pipe P is bent in a circular shape and stored and then straightened, or when it is bent in a straight condition and then bent, the pipe P is connected by its own restoring force. Try to change the direction of the axis with respect to the body 93. Then, the pipe P and the holding cylinder 92 are integrally displaced relative to the connecting cylinder 93 so as to swing, so that the pipe P does not incline inside the holding cylinder 92. Therefore, there is no risk that the pipe P will hit the seal ring 81 or the seal ring 88. Therefore, in the fifth embodiment, it is possible to prevent the deterioration of the sealing property in the holding cylinder 92 due to the inclination of the pipe P. The operations and effects other than those described above are the same as those of the fourth embodiment, and thus the description thereof is omitted.

<Sixth Embodiment> Next, a sixth embodiment of the present invention will be described with reference to FIG. Embodiment 6
Has a configuration in which a part of the connecting cylinder 93 in the fifth embodiment is changed. That is, while the connecting cylinder 93 of the fifth embodiment has a cylindrical shape in which the axis line is straight, in the sixth embodiment, the connecting cylinder 108 is provided on the opposite side of the holding cylinder 92. Has an L-shaped bent end, and the bent end is formed with a male screw portion 109 for connection with a mating tubular member (not shown). Since the configuration other than the above is the same as that of the fifth embodiment, the same components are designated by the same reference numerals, and the description of the structure, action, and effect will be omitted.

<Seventh Embodiment> Next, a seventh embodiment of the present invention will be described with reference to FIGS. The seventh embodiment has a configuration in which the connecting mechanism and the storage chamber 97 of the fifth embodiment are changed. That is, the connecting cylinder 1 of the seventh embodiment
In the accommodation chamber 111 of 10, the female screw portion 112 is formed at a position slightly recessed from the opening. Further, the connecting mechanism includes a sheet member 113 and a cylindrical lock member 114. The seat member 113 is made of a synthetic resin material such as Teflon or a synthetic rubber material, and has a seat surface 113A formed of a concave spherical surface having the same curvature as the outer surface of the spherical portion 95B. The lock member 114 is formed with a plurality of ball holes 114A that are spaced apart in the circumferential direction, opening at the outer circumference and the inner circumference, and the diameter of the ball hole 114A is larger than the thickness dimension of the lock member 114. The pressing ball 115 is fitted. A male screw portion 114B is formed on the outer periphery of the lock member 114.

At the time of assembly, the seat member 113 is inserted into the inner portion of the accommodation chamber 111 of the connecting cylinder 110, and the spherical portion 95B is attached to the lock member 114 with the pressing ball 115 displaced to the outer peripheral side. The press ball 115 is externally fitted so that the pressing ball 115 is located on the neck portion 95A side. In this state, the lock member 114 and the spherical portion 95B are inserted into the accommodation chamber 111.
Then, the pressing ball 115 is projected to the inner peripheral side by the engagement with the inner circumference of the accommodation chamber 111, and the pressing ball 115
The projecting portion of is engaged with the spherical portion 95B, and thereby the spherical portion 95B is restricted from coming off from the lock member 114.
After that, the male screw portion 114B of the lock member 114 is screwed into the female screw portion 112 of the housing chamber 111 and tightened. Then, the tip end surface of the lock member 114 presses the seat member 113 against the rear end surface of the accommodation chamber 111, and the pressing ball 115 sandwiches the spherical portion 95B in the axial direction with the seat surface 113A. The assembly is completed as described above. In the assembled state, the holding cylinder 92 and the connecting cylinder 11
Even if a relative displacement of 0 and 0 occurs, the spherical seat surface 13A of the seat member 113 is kept in close contact with the spherical portion 95B, so that the waterproof function is reliably exhibited. Further, since the outer peripheral surface and the end surface of the sheet member 113 are in close contact with the inner peripheral surface and the rear end surface of the accommodation chamber 111, the waterproof function on the inner periphery of the accommodation chamber 111 is also exerted. Since the other configurations are the same as those in the fifth embodiment, the same reference numerals are given to the same configurations, and the description of the structure, action, and effect is omitted.

<Other Embodiments> The present invention is not limited to the embodiments described above and illustrated in the drawings. For example, the following embodiments are also included in the technical scope of the present invention. In addition to the above, various modifications can be made without departing from the scope of the invention. (1) According to the present invention, in the first to seventh embodiments, the pipe P may be made of a softer metal material than the holding piece 28 instead of being made of synthetic resin. (2) According to the present invention, in the first to seventh embodiments, the holding piece 28 is not provided with the wedge-shaped biting protrusion 31.
The pipe P may be prevented from coming off by the frictional resistance between the pipe P and the pipe P.

(3) In the first to seventh embodiments, one of the two seal rings 18, 27 in contact with the outer periphery of the pipe P is attached to the joint body 11 and the other is attached to the inner cylinder 22. However, according to the present invention, two seal rings may be attached to only one of the joint body and the inner cylinder. (4) According to the present invention, only one of the two seal rings 18 and 27 in contact with the outer periphery of the pipe P in Embodiments 1 to 7 may be provided. For example, as shown in FIG. 19, only one seal ring 18 may be provided and the seal ring on the inner cylinder 22 side may be omitted. Even with this, a practically sufficient sealability may be obtained depending on the application. There are cases.

(5) According to the present invention, one of the two seal rings 18, 27 in contact with the outer circumference of the pipe P in the first to seventh embodiments is provided along the inner circumference of the holding piece 28. It may be provided. In this case, the pipe P of the seal ring is moved as the holding piece 28 is displaced in the diameter reducing direction.
Since the pressing force against the pressure increases, it is possible to further improve the sealing performance. (6) According to the present invention, the configuration in which the tapered sealing surface 47 is provided corresponding to the tubular connecting member A of the second embodiment may be applied to the third embodiment.

(7) In the first to seventh embodiments, the joint body 11 serves as means for displacing the holding piece 28 by reducing its diameter.
Although the tapered tightening surfaces 16 and 30 are formed on both of the holding piece 28 and the holding piece 28, according to the present invention, the tapered tightening surface may be provided only on one of the joint body and the holding piece. . (8) The present invention can be applied not only to piping equipment for supplying water and hot water in a house, but also to pipe joints used for piping equipment for other purposes.

(9) The expanded ring 83 and the guide pipe 84 of the fourth embodiment can be applied to the first, second, and third embodiments. (10) The guide pipe 84 of the fourth embodiment can be applied to the fifth, sixth and seventh embodiments. (11) According to the present invention, the expanding means is not limited to the expanding ring 83 which is separate from the joint body 71 as described in the fourth to seventh embodiments, but may be formed integrally with the joint body. Good. (12) In Embodiments 5 and 6, the spherical surface is provided only on the holding cylinder side, but according to the present invention, the spherical surface may be provided only on the connecting cylinder side, and the holding cylinder body is provided. It may be provided on both the connecting cylinder and the connecting cylinder.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state where a pipe is not connected in a first embodiment.

FIG. 2 is a sectional view showing a state in which pipes are connected in the first embodiment.

FIG. 3 is a partially enlarged cross-sectional view showing a biting state of a biting protrusion with respect to a pipe in the first embodiment.

FIG. 4 is a partial cross-sectional view showing a state in which a pipe and an inner cylinder are displaced in a pull-out direction in the first embodiment.

FIG. 5 is a cross-sectional view showing a state where pipes are not connected in the second embodiment.

FIG. 6 is a sectional view showing a state in which pipes are connected in the second embodiment.

FIG. 7 is a cross-sectional view showing a state where pipes are not connected in the third embodiment.

FIG. 8 is a sectional view showing a state where pipes are connected in the third embodiment.

FIG. 9 is a partial cross-sectional view showing a state where the ball valve mechanism is closed in the third embodiment.

FIG. 10 is a cross-sectional view of the pipe joint of the fourth embodiment.

FIG. 11 is a cross-sectional view showing a state in which a pipe is inserted in the pipe joint of the fourth embodiment.

FIG. 12 is a sectional view showing a state in which the pipe is being inserted in the fourth embodiment.

FIG. 13 is a partially enlarged cross-sectional view showing a state during insertion of a pipe in the fourth embodiment.

FIG. 14 is a sectional view of the fifth embodiment.

FIG. 15 is a sectional view showing a disassembled state of the fifth embodiment.

16 is a sectional view of Embodiment 6. FIG.

FIG. 17 is a sectional view of the seventh embodiment.

FIG. 18 is a sectional view showing a disassembled state of the seventh embodiment.

FIG. 19 is a cross-sectional view showing a modified example of the seal structure according to the first to seventh embodiments.

FIG. 20 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 10 ... Pipe joint 11 ... Joint body 16, 30 ... Tightening surface (tightening portion) 18, 27 ... Seal ring (sealing member) 21 ... Flow passage 22 ... Inner cylinder 28 ... Holding piece 31 ... Biting protrusion 40, 50, 70 ... Pipe joint 47 ... Sealing surface 56 ... Flow passage 57 ... Ball valve mechanism 58 ... Valve body 63 ... Through hole 71 ... Joint body 76, 87B ... Tightening surface (tightening portion) 81, 88 ... Seal ring (sealing member) 85 ... Inside Tube 87 ... Holding piece 87C ... Biting projection 91 ... Joint body 92 ... Holding tube 93, 108 ... Connecting tube 95 ... Spherical connecting part (connecting mechanism) 100, 103 ... O-ring (connecting mechanism) 101, 113 ... Seat member (connecting mechanism) 104, 114 ... Lock member (connecting mechanism) 105 ... Lock nut (connecting mechanism) 115 ... Pressing ball (connecting mechanism) A ... Tubular connecting member P Pipe

Claims (6)

[Claims] 1. A cylindrical joint body, and an inner cylinder fitted in the joint body so as to be displaceable in the axial direction so that a pipe can be inserted, wherein the inner cylinder has a radial direction. A displaceable holding piece is formed, and the holding piece can come into contact with the outer circumference of the holding piece and the inner circumference of the joint body as the inner cylinder moves in the drawing direction of the pipe, and at least A tapered tightening portion is formed to reduce the diameter in one direction toward the pipe withdrawal direction, and a wedge-shaped biting protrusion is formed on the inner circumference of the holding piece with respect to the outer circumference of the pipe. A pipe joint characterized in that 2. A tubular joint body, and an inner cylinder fitted in the joint body so as to be displaceable in the axial direction so that a pipe can be inserted therein. A displaceable holding piece is formed, and the holding piece can come into contact with the outer circumference of the holding piece and the inner circumference of the joint body as the inner cylinder moves in the drawing direction of the pipe, and at least A tapered tightening portion is formed, one of which is reduced in diameter in the pipe withdrawing direction, and a seal member which can be elastically pressed against the outer periphery of the pipe is provided at two positions spaced in the pipe withdrawing direction. A pipe joint characterized by being provided in. 3. A joint body having a tubular shape, and an inner cylinder fitted in the joint body so as to be displaceable in the axial direction so that a pipe can be inserted therein, wherein the inner cylinder has a radial direction. A displaceable holding piece is formed, and the holding piece can come into contact with the outer circumference of the holding piece and the inner circumference of the joint body as the inner cylinder moves in the drawing direction of the pipe, and at least A tapered tightening portion is formed, one of which is reduced in diameter in the pipe withdrawing direction, and the joint body is provided with a spherical valve body having a through hole, and the valve body is rotated. Is provided with a ball valve mechanism that shifts between a valve open state in which the through hole communicates with a flow passage in the joint body and a valve closed state in which the flow passage is blocked. 4. A taper-shaped seal for abutting a connecting end of a tubular connecting member, which is connected while being pulled in the axial direction, at a connection opening on the side opposite to the insertion side of the pipe in the joint body. The surface is formed, The pipe joint in any one of Claim 1 thru | or 3 characterized by the above-mentioned. 5. The expansion body is provided in the joint body for expanding the displacement by abutting the holding piece displaced in the pipe insertion direction from the contact position of the tightening portions. The pipe joint according to any one of claims 1 to 4. 6. The holding body for holding the pipe, the connecting body for connecting the mating tubular member on the side opposite to the insertion side of the pipe, and the holding body. The pipe joint according to any one of claims 1 to 5, wherein the pipe joint is composed of a connecting mechanism that connects the connecting pipe and the connecting pipe so as to be capable of relative displacement in a swinging manner.