JP3415112B2 - Pipe fittings - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to connecting fluid transport pipes such as water pipes and gas pipes or cable protection pipes for arranging optical fibers and the like, or fluid transport pipes and cable protection. A pipe joint used when connecting pipes to other piping equipment such as gate valves and information boxes.
Specifically, on the inner peripheral surface side of the receiving pipe portion into which the insertion pipe portion is inserted and connected, a retaining member that can be reduced in diameter so as to be recessed into the outer peripheral surface of the insertion pipe portion, and the relative separation of both pipe portions. A pipe provided with a cam portion that deforms the retaining member to the diameter reducing side with movement, and a sealing material that seals between the inner peripheral surface of the receiving pipe portion and the outer peripheral surface of the insertion pipe portion. Regarding fittings.

[0002]

2. Description of the Related Art In this type of pipe joint structure, an external force (pulling force in the pipe axis direction) acts on the receiving pipe portion and the insertion pipe portion due to an earthquake, differential settlement, or the like. However, as the retaining member is deformed toward the diameter reducing side by the cam portion as the receiving tube portion and the insertion tube portion move relative to each other in the axial direction of the tube axis, the retaining member is prevented by the outer peripheral surface of the insertion tube portion. You will eat deep
As a result, the separation resistance between the receiving tube part and the insertion tube part is increased, so that the separation preventing function of both tube parts can be enhanced.

In constructing such a pipe joint having a pipe separation preventing function, conventionally, as shown in FIG. 5, a receiving port 2C for the insertion pipe portion 1 is provided at one end side in the direction of the pipe axis X. In addition, both pipes are provided on the inner surface of the socket pipe portion 2 integrally formed in a tubular shape with the flange portion 2G fixedly connected to another piping device A provided on the other end side in the pipe axis X direction. This is an example of a cam portion for deforming the retaining member 3 toward the diameter reducing side as the portions 1 and 2 move relative to each other, and forms a tapered cam surface 5 having a diameter smaller toward the receiving port 2C side. The seal member 4 and the retaining member 3 are configured to be mounted at predetermined positions in the receiving pipe portion 2 through the receiving port 2C of the receiving pipe portion 2.

[0004]

In the conventional pipe joint, when the sealing material 4 and the retaining member 3 are assembled at predetermined positions in the receiving pipe portion 2, the sealing material 4 and the retaining member 3 are connected to the receiving pipe. Since the diameter is larger than that of the receiving port 2C of the portion 2, the sealing material 4 and the retaining member 3 are deformed against the elastic restoring force to a state in which the receiving port 2C can be passed, and The insertion operation must be performed while maintaining the deformed state, and the assembling work requires a lot of labor and labor. In particular, in order to increase the elastic deformation amount of the retaining member 3 and facilitate the mounting, the width of the cutout portion formed at one position in the circumferential direction of the retaining member 3 (opening in the circumferential direction). Since it is necessary to increase the width), the separation preventing function of the retaining member 3 is likely to decrease, and the molding material of the retaining member 3 is limited to soft synthetic resin. There is a problem that the scope of application is naturally limited.

The present invention has been made in view of the above situation, and its main problem is to efficiently and easily assemble the sealing material and the retaining member to the receiving pipe portion. In spite of this, it is an object of the present invention to provide a pipe joint capable of expanding the field of application by eliminating the restriction on manufacturing the retaining member.

[0006]

The characteristic configuration according to claim 1 of the present invention is such that the insertion pipe portion is inserted into the inner peripheral surface side of the receiving pipe portion and the outer peripheral surface of the insertion pipe portion. Of the retaining member that can be reduced in diameter and deformed, a cam portion that deforms the retaining member toward the diameter reducing side in accordance with the relative disengagement movement of both pipe portions, and the inner peripheral surface of the receiving pipe portion and the insertion pipe portion. A pipe joint provided with a sealing material that seals between the outer peripheral surface and the outer peripheral surface, wherein the receiving pipe part has a receiving port for the insertion pipe part at one end side in the axial direction of the pipe axis, and the receiving port An outer tube body having an opening having a larger diameter than the other end side in the tube axis direction, and an inner tube body connectable to the opening of the outer tube body in the tube axis direction, At the tip of the inner pipe body, when both pipe bodies are inserted and connected to the set connection position, the retaining member and the sealing material inserted from the opening of the outer pipe body And a pressing portion for pressing and moving the pipe to a predetermined mounting position are formed, and when the two pipes are opposed to each other, they are engaged with each other in the radial direction of the pipe when they are inserted and connected to the set connection position. The point is that a retaining means is provided to prevent the two tubes from slipping out.

According to the above characteristic structure, when the seal material and the retaining member are assembled at a predetermined position in the receiving pipe portion, one of the outer pipes constituting the receiving pipe portion has a larger diameter than the receiving port. The sealing material and the retaining member can be easily inserted without difficulty through the opening configured in, and when both pipes forming the receiving pipe portion are inserted and connected to the set connection position along the pipe axis direction. , The pressing portion formed at the tip of the other inner tube reliably presses and moves the retaining member and the sealing material inserted from the opening of the outer tube along the tube axis to the predetermined mounting position. Further, at this time, the retaining means provided at the opposing portions of the two pipes are engaged with each other in the pipe radial direction to reliably prevent the two pipes from slipping out.

Therefore, when assembling the sealing material and the retaining member at a predetermined position in the receiving tube portion, it is not necessary to largely deform the sealing material and the retaining member against the elastic restoring force as in the conventional case. Since the retaining member can be freely manufactured with a shape and material most suitable for various usage conditions of the pipe joint, it can be applied easily as a pipe joint while facilitating assembly work. Can also be expanded.

Further, since both pipes forming the receiving pipe portion are inserted and connected to the set connection position along the pipe axis direction, for example, when both pipes are fixedly connected by screwing means. In comparison, not only can the two pipes be joined quickly, but there is no cracking due to excessive tightening or slack due to insufficient tightening, and the sealing material is not twisted. Since it does not occur, it is possible to always reliably and satisfactorily perform the initial functions required for pipe joints, while facilitating the assembling work, improving efficiency and expanding the application field as described above. it can.

The pipe joint according to claim 2 of the present invention is characterized in that the retaining means is integrally formed on the outer peripheral surface of the inner tube made of synthetic resin, and the retaining projection has a tube diameter. It is composed of a locking hole formed in the outer tube body made of synthetic resin in a state of being engaged from the direction. According to the above characteristic structure, the locking projection and the locking hole that form the retaining means can be simultaneously processed at the time of resin molding of the inner tube body and the outer tube body. Therefore, the retaining means is included. It is possible to reduce the manufacturing cost of the pipe joint. Moreover, when both pipes are inserted and connected at the set connection position, the locking projections engage with the locking holes, so it is easy to reliably insert and connect both pipes with this locking hole. Can be visually confirmed.

According to a third aspect of the present invention, there is provided a characteristic feature of a pipe joint in which an inner peripheral surface of the inner tubular body is in contact with an end surface of an insertion pipe portion inserted and connected to a set insertion position in the axial direction of the pipe axis. The point is that the positioning portion is integrally formed. According to the above characteristic configuration, when inserting and connecting the insertion tube portion to the socket tube portion,
It is only necessary to insert the insertion tube part until the end surface of the insertion tube part comes into contact with the positioning part formed on the inner peripheral surface of the inner tube body, and the insertion and connection work of the insertion tube part can be ensured and simplified. Can be planned.

According to a fourth aspect of the present invention, there is provided a characteristic feature of a pipe joint, in which a peripheral groove formed on the outer peripheral surface of the inner tubular body is fitted with an elastic seal member for sealing between the inner peripheral surface of the outer tubular body. There is a point. According to the above characteristic configuration, the elastic sealing material prevents foreign matter such as sand from entering from the opening side of the outer tubular body through the annular gap between the inner peripheral surface of the outer tubular body and the outer peripheral surface of the inner tubular body. It can be surely prevented.

According to a fifth aspect of the present invention, there is provided a characteristic feature of the pipe joint, wherein the locking projection of the inner pipe body and the opening-side end portion of the outer pipe body are brought into contact with each other at the time of insertion connection to the set connection position,
The point is that an inclined guide surface is formed for deforming both the tubular bodies to a state where the locking projection is forcibly fitted and engaged with the locking hole. According to the above characteristic configuration, it is possible to easily perform the force-fitting engagement work of both pipes while increasing the engaging force between the engagement protrusion of the inner pipe and the engagement hole of the outer pipe.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION [First Embodiment] FIGS.
A pipe joint used when fitting and connecting fluid transport pipes P such as water pipes and gas pipes or cable protection pipes P for arranging optical fibers etc. in a sealed state from the pipe axis X direction The receiving pipe portion 2 into which the insertion pipe portion 1 of the one pipe P is inserted and connected and the receiving pipe portion 2 into which the insertion pipe portion 1 of the other pipe P is inserted and connected are concentrically provided. Along with
On the inner peripheral surface side of each socket tube portion 2, the outer peripheral surface 1 a of the insertion pipe portion 1
It is an example of a retaining member that can be deformed by reducing its diameter to a state where it bites into the inside. A retaining ring 3 made of steel or the like, and an inner peripheral surface 2a of the receiving pipe portion 2 and an outer peripheral surface 1a of the inserting pipe portion 1 at a position farther from the receiving port 2C than the retaining ring 3.
An annular synthetic rubber (for example,
(Styrene butadiene rubber) elastic sealing material 4 is attached, and further, the retaining ring 3 is reduced on the inner peripheral surface of each of the receiving tube portions 2 along with the relative disengagement movement of both the tubular portions 1 and 2. It is an example of a cam portion for elastically deforming to the above, and a tapered cam surface 5 having a smaller diameter on the receiving port 2C side is formed.

Further, the outer peripheral surface 3a of the retaining ring 3 is
Like the cam surface 5 formed on the inner peripheral surface of the receiving tube portion 2, the inner peripheral surface of the retaining ring 3 is formed on a tapered inclined surface having a smaller diameter on the side of the receiving opening 2C. Has
A large number of sharp biting projections that can be bited are formed on the outer peripheral surface 1a of the insertion tube portion 1, and the detachment direction is different between the receiving tube portion 2 and the insertion tube portion 1 due to an earthquake, differential settlement, or the like. When an external force (pulling force in the direction of the tube axis X) is applied to the retaining ring 3, the retaining ring 3 is tapered as the receiving tube 2 and the insertion tube 1 move relative to each other in the direction of the tube axis X. The outer peripheral surface 3a is brought into contact with the cam surface 5 on the side of the receiving pipe portion 2, whereby the retaining ring 3 is elastically deformed gradually toward the radially reduced side, so that it is formed on the inner peripheral surface of the retaining ring 3. A large number of sharp biting projections that are going to bite deeply into the outer peripheral surface 1a of the insertion tube portion 1,
As a result, it is possible to enhance the function of preventing the receiving tube section 2 and the insertion tube section 1 from coming off.

Each of the receiving tube portions 2 is provided with a receiving opening 2C for the insertion tube portion 1 at one end side in the direction of the tube axis X, and has an opening 2D having a diameter larger than the receiving opening 2C. 2A of synthetic resin (for example, polyacetal or polypropylene) provided on the other end side in the direction and an opening 2D of the outer tube 2A
And an inner tube body 2B made of synthetic resin (for example, polyacetal) that can be inserted and connected from the tube axis X direction, and both inner tube bodies 2B are integrally molded in a concentric state. There is.

The inner diameter of the receiving port 2C of the outer tubular body 2A is configured to be slightly larger than the outer diameter of the insertion tubular portion 1, and the inner diameter of the opening 2D of the outer tubular body 2A is in an unloaded state. Since it is configured to be larger than the maximum outer diameter of the stop ring 3 and substantially the same as or slightly larger than the outer diameter of the elastic sealing material 4, through the opening 2D configured to be larger than the receiving port 2C. The retaining ring 3 and the elastic sealing material 4
Can be easily and easily inserted.

At the tip of each inner pipe 2B, both pipes 2 are attached.
When A and 2B are inserted and connected to the set connection position,
The retaining ring 3 inserted from the opening 2D of the outer tubular body 2A
And a pressing portion (pressing surface) 2 for pressing the elastic sealing material 4 along the tube axis X direction to a predetermined mounting position in a sliding state.
b is formed, and the elastic seal material 4 located between the pressing portion 2b of each inner pipe body 2B and the retaining ring 3 is the insertion pipe portion 1
Are configured to be in a predetermined sealed state when they are inserted and connected, and at the portions of the two pipe bodies 2A and 2B that face each other in the pipe radial direction, they are forcibly fitted to the set connection position. There is provided a retaining means 6 which engages in the radial direction of the pipe and prevents the two pipes 2A and 2B from moving out when they are inserted and connected.

The retaining means 6 are provided at a plurality of circumferential positions on the outer peripheral surface of the inner tubular body 2B (in this embodiment, they are two regions facing each other in the pipe radial direction, and in the circumferential direction of each region). Locking projections 6A formed integrally at two adjacent locations, a total of four locations, and a plurality of locations (in this embodiment, locking) of the outer tubular body 2A in a state in which the respective locking projections 6A are engaged in the radial direction of the tube. The locking holes 6B are formed at the same four places as the projections 6A), and the locking projections 6A of the inner tube 2B and the end of the outer tube 2A on the side of the opening 2D are set. In order to elastically deform both the pipe bodies 2A, 2B until they come into contact with each other from the X-axis direction of the pipe axis at the time of inserting and connecting to the connection position and force the respective locking protrusions 6A into the respective locking holes 6B for forced engagement. Inclined guide surfaces 6a and 2d are formed.

Further, as a method for releasing the retaining means 6 from retaining, the respective locking projections 6A of the inner tube body 2B are pushed to a state in which it is smaller than the inner diameter of the outer tube body 2A, and both tubes are in that state. It is conceivable to pull out the bodies 2A and 2B in the disengagement direction, but a great deal of labor is required to push in the respective locking projections 6A and pull out both pipes 2A and 2B. Therefore, each locking protrusion 6A of the inner pipe body 2B is made of synthetic resin, and each locking protrusion 6A is exposed to the outside through the locking hole 6B of the outer pipe body 2A. Stop projection 6
By cutting away A, the two tubular bodies 2A and 2B can be easily separated with a small amount of labor. In other words, the retaining means 6 can be released from the retaining means 6 by cutting and removing the locking projections 6A.

Further, at the center position of the inner peripheral surface of the integrally formed inner tube body 2B in the direction of the tube axis X, and at a plurality of locations (six locations in this embodiment) spaced at predetermined intervals in the circumferential direction. ,
A positioning protrusion (an example of a positioning portion) 7 that comes into contact with the end faces 1b of both insertion pipe portions 1 that are inserted and connected to the set insertion position from the pipe axis X direction is integrally formed, and an integrally formed inner pipe An elastic seal material 8 such as an O-ring that seals between the outer peripheral surface of the body 2B and the inner peripheral surface 2a of the outer tubular body 2A is mounted in each peripheral groove 2e formed near the end of the outer peripheral surface of the body 2B.

[Second Embodiment] FIG. 3 shows a pipe joint used when connecting a pipe P such as a fluid transportation pipe or a cable protection to other piping equipment such as a sluice valve or an information box.
An example of a retaining member that is elastically deformable on the inner peripheral surface side of the receiving pipe portion 2 into which the insertion pipe portion 1 of FIG. The retaining ring 3 made of synthetic resin or metal formed in a substantially C-shape that can be reduced in diameter and deformed, and at the rear side position further away from the receiving port 2C than the retaining ring 3, the receiving tube portion 2 A ring-shaped synthetic rubber elastic seal member 4 for sealing between the inner peripheral surface 2a of the insert tube portion 1 and the outer peripheral surface 1a of the insertion tube portion 1 is mounted. Is an example of a cam portion for elastically deforming the retaining ring 3 toward the diameter reducing side as the two pipe portions 1 and 2 move relative to each other, and a tapered cam surface 5 having a diameter smaller toward the receiving port 2C side is formed. Has been formed.

The receiving tube portion 2 is provided with a receiving port 2C for the insertion tube portion 1 at one end side in the direction of the tube axis X, and the receiving port 2C.
An outer tube body 2A made of a synthetic resin having an opening 2D having a diameter larger than that of the outer tube body 2A on the other end side in the tube axis X direction, and the opening 2 of the outer tube body 2A.
The inner tube body 2B is made of synthetic resin (for example, polyacetal) and can be plugged into and connected to the tube axis X with respect to D. At the other end of the inner tube body 2B, another pipe is provided. A screw cylinder 2E for connecting to a device is integrally molded.

The inner diameter of the receiving port 2C of the outer tube 2A is slightly larger than the outer diameter of the insertion tube 1, and the inner diameter of the opening 2D of the outer tube 2A is unloaded. It is configured to be larger than the maximum outer diameter of the retaining ring 3 and substantially the same as or slightly larger than the outer diameter of the elastic seal member 4, and further, the inner diameter of the screw cylinder portion 2E of the inner pipe body 2B is the insertion pipe portion. Since it is configured to be slightly smaller than the outer diameter of 1, the retaining ring 3 and the elastic seal member 4 can be easily inserted without difficulty through the opening 2D configured to have a diameter larger than the receiving port 2C.

At the tip of the inner tube 2B, both tube 2 are attached.
When A and 2B are inserted and connected to the set connection position,
The retaining ring 3 inserted from the opening 2D of the outer tubular body 2A
A pressing portion 2b for pressing the elastic sealing member 4 and the elastic sealing material 4 in a sliding state along the tube axis X direction is formed, and between the pressing portion 2b of the inner tube body 2B and the retaining ring 3. The elastic sealing material 4 located at is configured so as to be in a predetermined sealed state when the insertion pipe portion 1 is inserted and connected, and is a portion facing each other in the pipe radial direction of the two pipe bodies 2A and 2B. Is provided with a retaining means 6 that engages in the radial direction of the pipes and prevents the pipes 2A and 2B from moving out when they are inserted and connected to the set connection position by force fitting.

The retaining means 6 has locking projections 6A integrally formed at a plurality of circumferential positions on the outer peripheral surface of the inner tubular body 2B,
Each of the locking projections 6A is composed of a locking hole 6B which is formed at a plurality of positions of the outer tube body 2A so as to be engaged with each other in the radial direction of the tube, and each locking projection 6 of the inner tube body 2B.
A and the end portions of the outer tube body 2A on the opening 2D side are brought into contact with each other from the tube axis X direction at the time of insertion connection to the set connection position, and each locking projection 6A is forcibly fitted into each locking hole 6B. Inclined guide surfaces 6a and 2d for elastically deforming the two pipe bodies 2A and 2B are formed to a combined state.

At the inner peripheral surface of the inner tube body 2B and at the position corresponding to the base end of the screw tube body 2E, the end surface 1b of the insertion tube portion 1 inserted and connected to the set insertion position and the tube axis core. An annular positioning step portion (an example of a positioning portion) 7 abutting from the X direction is integrally formed, and the inner tubular body 2 is also provided.
An elastic seal member 8 such as an O-ring that seals between the outer circumferential surface of B and the inner circumferential surface 2a of the outer tubular body 2A is attached to the circumferential groove 2e formed near the tip of the outer circumferential surface of B.

[Third Embodiment] FIG. 4 shows a pipe joint used when fitting and connecting a pipe P such as a fluid transportation pipe or a cable protection in a sealed state from three directions. The three inlet pipe portions 2 each inserted and connected are connected in a T-shape, and the inner peripheral surface side of each inlet pipe portion 2 bites into the outer peripheral surface 1 a of the insertion pipe portion 1. An example of a retaining member that can be deformed by reducing its diameter to a state, and is a retaining ring 3 made of synthetic resin or metal that is elastically capable of reducing its diameter and is formed in a substantially C-shape.
And a ring-shaped composite for sealing between the inner peripheral surface 2a of the receiving tube portion 2 and the outer peripheral surface 1a of the insertion tube portion 1 at a position farther from the receiving opening 2C than the retaining ring 3. An elastic seal member 4 made of rubber is attached, and furthermore, the retaining ring 3 is elastically contracted to the diameter reducing side on the inner peripheral surface of each of the receiving pipe portions 2 as the pipe portions 1 and 2 move relative to each other. This is an example of a cam portion for deforming, and a tapered cam surface 5 having a smaller diameter on the receiving port 2C side is formed.

Each of the receiving tube portions 2 is provided with a receiving opening 2C for the insertion tube portion 1 at one end side in the direction of the tube axis X, and has an opening 2D having a diameter larger than that of the receiving tube 2C. And an inner tube body 2B made of synthetic resin which is insertable and connectable from the opening 2D of the outer tube body 2A in the X-axis direction of the tube axis. In addition, the three inner tube bodies 2B are integrally formed in a T shape.

The inner diameter of the receiving port 2C of each outer tube 2A is
It is configured to be slightly larger than the outer diameter of the insertion tube portion 1, and the inner diameter of the opening 2D of each outer tube body 2A is larger than the maximum outer diameter of the retaining ring 3 in the unloaded state, and
Since the outer diameter of the elastic seal member 4 is substantially the same as or slightly larger than the outer diameter of the elastic seal member 4, the retaining ring 3 and the elastic seal member 4 can be easily and easily passed through the opening 2D having a larger diameter than the receiving port 2C. Can be inserted into.

At the tip of each inner tube 2B, both tube 2
When A and 2B are inserted and connected to the set connection position,
The retaining ring 3 inserted from the opening 2D of the outer tubular body 2A
A pressing portion 2b for pressing the elastic sealing member 4 and the elastic sealing material 4 in a sliding state along the tube axis X direction is formed, and the pressing portion 2b of each inner tube body 2B and the retaining ring 3 are formed. The elastic sealing member 4 located between them is configured to be in a predetermined sealed state when the insertion tube portion 1 is inserted and connected, and opposes both the tube bodies 2A and 2B in the tube radial direction. The portions are provided with retaining means 6 that engages in the radial direction of the pipes and prevents the two pipe bodies 2A and 2B from slipping out when they are inserted and connected to the set connection position by force fitting. .

The retaining means 6 has locking projections 6A integrally formed at a plurality of circumferential positions on the outer peripheral surface of the inner tubular body 2B,
Each of the locking projections 6A is composed of a locking hole 6B which is formed at a plurality of positions of the outer tube body 2A so as to be engaged with each other in the radial direction of the tube, and each locking projection 6 of the inner tube body 2B.
A and the end portions of the outer tube body 2A on the opening 2D side are brought into contact with each other from the tube axis X direction at the time of insertion connection to the set connection position, and each locking projection 6A is forcibly fitted into each locking hole 6B. Inclined guide surfaces 6a and 2d for elastically deforming the two pipe bodies 2A and 2B are formed to a combined state.

Further, the tube axis X of the inner peripheral surface of each inner tube body 2B
A positioning projection 7 that comes into contact with the end faces 1b of both insertion tube portions 1 inserted and connected to the set insertion position from the tube axis X direction is integrally formed at the center position in the direction, and the inner tube is integrally formed. An elastic seal material 8 such as an O-ring that seals between the outer circumferential surface 2a of the outer tubular body 2A and the inner circumferential surface 2a of the outer tubular body 2A is attached to the circumferential groove 2e formed near the end of the outer circumferential surface of the body 2B.

Other Embodiments (1) An elastic sealing material made of synthetic rubber that seals between the outer tubular body 2A and the outer peripheral surface 1a of the insertion tubular portion 1 is attached to the end portion on the receiving port 2C side. You may carry out. (2) As an example of the cam portion for elastically deforming the retaining ring 3 toward the diameter reducing side in accordance with the relative disengagement movement of the both pipe portions 1 and 2, in each of the above-mentioned embodiments, the receiving pipe portion 2 is provided. On the inner surface,
Although the tapered cam surface 5 having the smaller diameter on the side of the receiving port 2C is formed, the present invention is not limited to this configuration, and the contact with the cam member attached to the receiving port section 2 causes both tube portions 1, The retaining ring 3 may be elastically deformed toward the diameter reducing side in accordance with the relative separation movement of 2. (3) As the retaining member 3, the outer peripheral surface of the insertion tube portion 1
Any shape may be used as long as it can be contracted and deformed to a state where it bites into 1a. (4) In each of the above-mentioned embodiments, the retaining means 6 is composed of the locking projection 6A integrally formed on the outer peripheral surface of the inner tube body 2B and the locking hole 6B penetratingly formed in the outer tube body 2A. Although configured, the locking projection 6 is integrally formed on the inner peripheral surface of the outer tubular body 2A.
It may be configured by A and a locking hole 6B formed through the inner tube body 2B. In short, as the retaining means 6,
When the two pipes 2A, 2B are slidably connected to the set connection position and connected, the two pipes 2A, 2A are engaged with each other in the radial direction of the pipe.
Any structure may be adopted as long as it can prevent the moving out of 2B.

[Brief description of drawings]

FIG. 1 is a sectional side view showing a first embodiment of a pipe joint of the present invention.

FIG. 2 is an exploded perspective view

FIG. 3 is a sectional side view showing a second embodiment of the pipe joint of the present invention.

FIG. 4 is a sectional side view showing a third embodiment of the pipe joint of the present invention.

FIG. 5 is a sectional side view showing a conventional pipe joint.

[Explanation of symbols]

X tube axis 1 Insertion tube 2 Receiving pipe section 2A outer tube 2B inner tube 2b Pressing part 2d inclined guide surface 2e Circumferential groove 3 retaining member (retaining ring) 4 Seal material 5 Cam part (cam surface) 6 retaining means 6A locking protrusion 6B locking hole 6a Inclined guide surface 7 Positioning part 8 Seal material

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F16L 21/08 F16L 37/08

Claims (3)

(57) [Claims] 1. A retaining member, which is capable of undergoing a diameter reduction deformation on the inner peripheral surface side of a receiving pipe portion into which the insertion pipe portion is inserted and connected so as to be recessed into the outer peripheral surface of the insertion pipe portion, and both pipe portions. A cam portion that deforms the retaining member toward the diameter reducing side in accordance with the relative disengagement movement, and a seal material that seals between the inner peripheral surface of the receiving pipe portion and the outer peripheral surface of the insertion pipe portion are provided. In the pipe joint, the receiving pipe part has a receiving port for the insertion pipe part on one end side in the pipe axis direction, and an opening having a diameter larger than the receiving port is the other end side in the pipe axis direction. And an inner tube body that can be inserted into and connected to the opening of the outer tube body from the tube axis direction, and both tube bodies are set at the set connection position at the tip of the inner tube body. And a pressing portion for pressing and moving the retaining member and the sealing material inserted from the opening of the outer tubular body to a predetermined mounting position when connected by inserting Together are the the opposing portions of two pipe bodies, when they are inserted connected to a set connection position, provided with retaining means for engaging the tube diameter direction prevents escape movement of the two pipe members In addition,
This retaining means is provided on the outer peripheral surface of the inner tube made of synthetic resin.
The locking projection formed on the body and the locking projection are engaged from the pipe radial direction.
Locking hole formed on the outer tube made of synthetic resin in the mating state
A pipe joint composed of and . 2. The pipe joint according to claim 1, wherein an elastic seal material is provided in the peripheral groove formed on the outer peripheral surface of the inner tubular body to seal the inner peripheral surface of the outer tubular body. 3. The locking projection of the inner tube and the opening-side end of the outer tube are brought into contact with each other when they are inserted and connected to a set connection position, and the locking projections are forcibly fitted into the locking holes. The pipe joint according to claim 1, wherein an inclined guide surface is formed for deforming both pipes to a state where they are brought together.