JP2002156084A - Connection device for pipe body made of synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection device for pipe bodies capable of securely connecting the pipe bodies due to sufficient biting of a tightening ring on the pipe bodies and obtaining sufficient water cut-off effect by pressing and crushing a water cut-off ring securely. SOLUTION: This connection device for the pipe bodies is provided with a sleeve body 20 in which the pipe body is inserted and which is screw-fitted so as to advance and retract freely for a connection device main body 10 along the axial direction of the inserted pipe body, a plurality of elastic locking pieces 31 extended toward an anti-insertion direction of the pipe body so as to be shrunk, closed, and deformed so that a locking claw 32 formed on a tip side bites an outer face of the pipe body to lock the pipe body due to pressing of the sleeve body 20 screw-advancing for the connection device main body 10, and a ring body 30 movable in the direction of pipe body insertion to deform the water cut-off ring 40 due to pressing of the sleeve body 20 so that the water cut-off ring 40 arranged in the connection device main body 10 is brought into pressure-contact with the outer face of the pipe body to cut off water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting device for a synthetic resin pipe used for a pipe joint, and more particularly, to a pipe (for example, a cross-linked polyethylene pipe) which can be securely inserted by sufficiently engaging the pipe with a fastening ring. The present invention relates to a connection device for a synthetic resin tube body that can be connected and can stop water.

[0002]

2. Description of the Related Art Conventionally, as a pipe joint, Japanese Utility Model Publication No. 54-1
No. 2727 or Japanese Utility Model Laid-Open Publication No. 64-21887.

[0003] In such a pipe joint, the diameter of a tightening ring housed therein is reduced by pressing an inner surface of a tightening nut (union) screwed into a joint body into which the pipe is inserted. While being connected to the joint body so that it cannot be pulled out, the watertight ring formed by an O-ring or the like, which is arranged in the joint body and crushed, is brought into close contact by the movement of the tightening ring in the axial direction of the tube due to the pressing, and the sealing property The water-stopping structure is enhanced.

[0004] However, when the pipe joints according to the prior art described in these publications are actually used, when the tightening nut presses the tightening ring, the claw at the tip of the tightening ring is pushed into the pipe body. The locking ring cannot move in the axial direction of the pipe from that location, so the crushing of the water blocking ring is insufficient and the sealing performance with the pipe cannot be ensured. In this way, there is a problem that water is not reliably stopped because the pipe body and the water stop ring are not sufficiently adhered to each other.
Furthermore, even if the tightening ring does not move in the axial direction, if the tightening nut is forcibly tightened to crush the water stop ring, the claw or tube formed at the end of the tightening ring may be damaged. There was also.

On the other hand, a technique described in Japanese Utility Model Laid-Open No. 5-81586 is a technique that can eliminate the leakage due to insufficient crushing of the water stop ring. The technology described in this publication is intended to prevent the tube from being pulled out and to ensure the sealing performance by properly digging into the tube and crushing the "packing" which is a water stop ring. This is an effective technique in that the “retainer” crushes the “packing” to reliably stop water.

However, the pipe joint of the technique described in this publication has the following problems.

First, the pipe joint described in the above publication has a problem in that it is easily affected by tolerance of the outer diameter of the pipe.

That is, a tube having a large outer diameter is
When inserted into the pipe joint according to the above publication and the "nut" is tightened, the "biting ring" bites into the outer surface of the tube immediately, making it difficult to move the tube in the insertion direction. And the compression of the "packing" is insufficient. To further move the tube in the insertion direction in such a state, the “nut” must be tightened more than necessary. Therefore, since the "nut" is forcibly tightened, a load is applied to each part of the pipe joint and the pipe body, and each member may be damaged.

On the other hand, when a pipe having a small outer diameter is connected by the pipe joint according to the above-mentioned publication, the bite ring does not bite into the outer surface of the pipe. There is a risk that it will come off.

[0010] Further, when the pipe is connected by the conventional pipe joint as described above, it is difficult to completely fix the pipe, so that the longitudinal length of the pipe is changed due to a change in water pressure in the pipe. The movement in the direction repeatedly occurs, and by repeating the movement of the tube, the tube and the “packing” rub against each other, and the “packing” is worn. as a result,
There is a problem that the water stopping effect of the pipe joint is reduced.

[0011] Since it is constituted by a large number of independent parts, there is a problem that the structure becomes complicated and the manufacturing cost rises.

[0012]

SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a pressure-tightening nut, in which the tightening ring bites into a pipe body, whereby the axial movement of the ring is hindered and a sufficient water stopping effect is obtained. The conventional problem of not being able to be obtained is solved, and the sufficient engagement of the tightening ring into the pipe allows the pipe to be securely connected, and the water stop ring to be crushed securely to achieve a sufficient water stop effect. It is an object of the present invention to provide a tube connecting device that can be obtained.

[0013]

Means taken by each of the present invention to solve the above problems will be described with reference numerals used in the embodiments. First, the synthetic resin of the invention according to claim 1 will be described. The tube connecting device 100 includes a connecting device body 10 to which a synthetic resin tube is connected, and the tube inserted therein.
A sleeve body 20 screwed into and out of the connection device body 10 along the axial direction of the inserted tube body; and a sleeve body 20 screwed into the connection device body 10
By pressing, the engaging claw 32 formed on the distal end side is extended in the direction opposite to the insertion direction of the tube so as to bite into the outer surface of the tube and deform so as to close and lock the tube. A plurality of elastic locking pieces 31;
Pressing the sleeve body 20 in the insertion direction of the tube so as to deform the water stop ring 40 so that the water stop ring 40 disposed therein is pressed against the outer surface of the tube to stop the water. The locking claw 32 is prevented from moving due to the pressing of the sleeve body 20 by the engagement of the locking claw 32 into the outer surface of the tubular body. In order to prevent the crushing of the ring 40 from becoming insufficient, the ring is characterized by being bent at an acute angle in the insertion direction of the tube from the elastic locking piece 31 and protruding therefrom.

The synthetic resin pipe of the first aspect (hereinafter referred to as "the pipe")
The connection device 100 is referred to as a “tube body”.
0, a sleeve body 20, a ring body 30 having a plurality of elastic locking pieces 31 each having a locking claw 32 formed at a tip thereof, and a water blocking ring 40. , For connecting a tube inserted from the sleeve body 20 side.

Particularly, in the connecting device 100 according to the present invention, the locking claw 32 provided at the tip of the elastic locking piece 31 of the ring body 30 has an acute angle from the elastic locking piece 31 in the insertion direction of the tube. It is folded back and protruded. This locking claw 32
Is to pierce and bite the outer surface of the tube inserted into the connection device 100 to lock the tube.

As described above, since the locking claw 32 is formed by being bent at an acute angle to the tip of the elastic locking piece 31, the inner peripheral surface of the sleeve body 20 presses the tip of the ring body 10. At this time, the locking claw 32 is pierced from the outer surface of the tubular body in a direction formed by being bent at an acute angle. Accordingly, the ring body 30 moves in the insertion direction of the tube by a distance corresponding to the depth of the “stick” of the locking claw 32 into the tube. Then, the ring body 30 crushes the water-stop ring 40 arranged near the lower end thereof and makes it close to the pipe,
It will have a water stopping effect.

Next, a connecting device 100 for a synthetic resin tube according to the second aspect of the present invention is the same as the connecting device 100 for a synthetic resin tube according to the first embodiment, wherein the ring 30 is provided with the water stop ring 40. In order to prevent a certain degree of crushing, a contact portion 33 is provided which comes into contact with the connection device body 10 in order to restrict a certain degree of movement due to the pressing of the sleeve body 20.

That is, according to the connecting device 100 for a synthetic resin pipe body of the second aspect, when the sleeve body 20 presses, the contact portion 33 provided on the ring body 30 is brought into contact with the connecting device body 10. The water stop ring 40 is prevented from being crushed more than a certain amount by the ring body 30, and furthermore, adverse effects such as breakage of the water stop ring 40 or deformation of the pipe due to crushing the water stop ring 40 more than a certain amount are generated. It enables prevention.

The connecting device 100 for a synthetic resin tube according to the third aspect of the present invention is the same as the connecting device 100 for a synthetic resin tube according to the second embodiment, wherein the ring body 30 is connected to the contact portion 33.
Thus, at the position where the movement is restricted, the connection device main body 10 and the sleeve body 20 sandwich the tube body to prevent the tube body from moving in the anti-insertion direction.

According to the connecting device of the third aspect of the present invention, it is possible to suppress the movement of the pipe in the longitudinal direction due to a change in water pressure in the pipe. That is, by suppressing the movement of the pipe, the pipe and the water stop ring 40 are prevented from moving.
Abrasion of the water stop ring due to rubbing of the water stop ring and the water stop effect of the connection device due to the wear of the water stop ring can be prevented beforehand.

According to a fourth aspect of the present invention, there is provided a connecting device for a synthetic resin tube according to any one of the first to third aspects. Is projected so that the distance from the base end to the tip in the axial direction of the pipe is "same or longer" than the distance for crushing the water stop ring 40 in the coaxial direction so as to press the water stop ring 40 against the outer surface of the pipe. It is characterized by that.

As described above, the ring body 30 is provided with the water stopping ring 4.
The reason for moving in the tube insertion direction to crush 0 is that the engaging claw 32 formed by being bent at an acute angle is formed on the outer surface of the tube toward the distal end thereof (not reaching the inner surface of the tube). This is caused by piercing into the body of the body. Therefore, when the ring body 30 moves, the water stop ring 40
Is crushed, and the water stop ring 40 is pressed against and adheres to the outer surface of the tubular body, thereby preventing water leakage from the connection device 100.

In particular, in the connecting device according to the fourth aspect, the size of the locking claw 32 formed by folding back at an acute angle at the tip of the elastic locking piece 31 of the ring body 30, and the ring body 30 The distance to be crushed is equal to or longer than the moving distance.

First, when the formation size of the locking claw 32 is "the same as the moving distance" of the ring body 30, the engagement of the sleeve body 20 with the connection device body 10 in the pipe insertion direction is performed. The locking claw 32 penetrates and penetrates the outer surface of the tube, and the ring body 30 moves accordingly, and the water stop ring 40
, And the water stop ring 40 exhibits a water stop effect.
For this reason, it is possible to prevent the occurrence of water leakage or the like due to insufficient crushing of the water stop ring 40.

Further, when the formation size of the locking claw 32 is formed to be "longer than the moving distance", the size of the locking claw 32 has more allowance than in the case of "the same". Therefore, even if the above-mentioned insertion of the locking claw 32 into the outer surface of the tubular body is not sufficient at the time of construction, the ring body 30 moves as much as necessary to crush the water stop ring 40. Therefore, the ring body 30 is the water stop ring 4
0 is securely crushed, and the water stop ring 40 is
This makes it possible to prevent the occurrence of water leakage or the like from the connection device 100 by closely adhering to the pipe inserted into the tube.

According to a fifth aspect of the present invention, there is provided a synthetic resin tube connecting apparatus 100 according to any one of the first to fourth aspects. The elastic locking piece 31 and the water stop ring 40 are returned to their original shapes by the screw body 20 withdrawing from the connection device main body 10, whereby the locking by the locking claw 32 and the pressure contact by the water stop ring 40 are released. It is characterized by that.

In other words, according to the connecting device 100 for a synthetic resin tube of the fifth aspect, when the restriction on the ring 30 by the sleeve 20 in the tube insertion direction is released, the ring 30 The elastic locking piece 31 and the water blocking ring 40 return to their original shapes, the restriction on the pipe by the connection device 100 is released, and the pipe can be removed. Is made detachable.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A connecting device 100 for a synthetic resin tube according to the present invention includes a connecting device main body 10, a sleeve body 20, a ring body 30, and a water stop ring 40 as constituent elements. A description will be given for each configuration requirement.

First, the connection device main body 10 is screwed and integrated with a sleeve body 20, which will be described later, and houses the ring body 30 and the water blocking ring 40 inside thereof. Then, a pipe inserted from one end of the connection device main body 10 in which the ring body 20 is accommodated is connected to a pipe or a water diversion device (header) arranged at the other end.

Here, the connection method with the above-mentioned "tube or water diversion device (header) arranged at the other end" is specifically described by screwing the connection device main body 10 and the tube or the like. It is conceivable to connect by. That is, when a male screw is formed for a pipe or the like to be connected, a female screw corresponding to the male screw is formed on the inner peripheral surface of the connection device body 10. Then, it is conceivable that the outer peripheral surface is formed like a nut so that screwing can be easily performed with a spanner or the like.

Of course, the present invention is not particularly limited to such a structure, and it may be easily detachable using an existing general attachment. It is also considered effective to integrally form the connection device main body 10 and the pipe or the header 200 in order to further reduce the risk of water leakage or the like.

On the other hand, the portion of the connection device body 10 on the side where the sleeve body 20 is screwed (hereinafter referred to as a "threaded portion") is considered as follows.

First, a storage portion capable of storing a ring body 30 and a water stop ring 40, which will be described later, is formed with the contact surface against which the inserted tube abuts as a bottom surface. Then, in order to be screwed with a sleeve body 20 described later, a male screw corresponding to a female screw formed on the inner peripheral surface of the screwed portion of the sleeve body 20 is formed in a screwed portion of the connection device body 10. ing.

The connecting device main body 10 is preferably made of a material having high resistance to chlorine water and hot water. Specifically, polyphenylsulfone (Polyphenyl)
Sulfone (hereinafter referred to as “PPSu”).

Next, the sleeve body 20 is provided at the screwed portion of the connection device main body 10 so as to be axially movable back and forth along the tube inserted together with the connection device main body 10. is there. Then, when the sleeve body 20 is screwed into the connection device body 10, the inner peripheral surface of the sleeve body 20 presses a locking claw 32 at the tip of a ring body 30 described later, and the locking claw 32 is The stab is inserted into the outer surface of the tube.

Any shape may be used as long as it has the above-mentioned action. Specifically, the following configuration may be adopted. That is, the pipe is entirely formed into a cylindrical shape, and the inner peripheral surface of the cylindrical shape on the side where the pipe is inserted is formed so as to contract (to taper) toward the pipe insertion end. With the suspended configuration, it is possible to press a locking claw 32 formed at the tip of an elastic locking piece 31 of the ring body 30 described later. It is conceivable that the other end of the cylindrical shape is threaded with a female screw on the inner peripheral surface of the end portion so as to be screwed into and out of the connection device body 10 so as to be able to advance and retreat.

The connection device body 10 and the sleeve body 20
With regard to the pair of screw grooves which are screwed into the above, there is no problem even if the male and female can be screwed in reverse.

The sleeve body 20 is desirably formed of a material having high chlorine water resistance and high hot water resistance. Specifically, it is considered that the sleeve body 20 is formed of polyphenylsulfone (PPSu).

The ring body 30 engages with the tube inserted together with the sleeve body 20 to fasten the tube to the connecting device 100, and crushes a water stop ring 40 described later. The ring body 30 has a cylindrical shape having an inner diameter that allows a tube to be inserted to be sufficiently inserted, and a plurality of slits are formed in one of the cylindrical shapes to form a plurality of elastic locking pieces 31. . The elastic locking piece 31 has flexibility that can be tilted by being pressed by the sleeve body 20 screwed to the connection device main body 10, and has a locking claw 32 at a distal end thereof.

The locking claw 32 is bent from an end of the elastic locking piece 31 at an acute angle and protrudes therefrom. Therefore, the locking claw 32 is pressed against the inner peripheral surface of the sleeve body 20 to pierce the outer surface of the tube inserted into the connection device 100 (not to reach the inner surface of the tube). The locking claw 32
In the direction of the tip of the tube.
Then, the ring 30 itself moves in the insertion direction of the tube as it “enters” the tube. Due to the movement of the ring body 30, a water stop ring 40 described later is crushed, and the water stop ring 40 is pressed by the tube and comes into close contact with the tube.

The engaging claw 32 may have any shape as long as it has the above-described action. Specifically, the distal end of the elastic engaging piece 31 of the ring body 30 is folded back to form a pipe. It is conceivable to form a sharp projection in the body insertion direction. By adopting the suspended configuration, the locking claw 32 is engaged with the pipe, and the removal of the pipe from the connection device 100 can be prevented.

The locking claw 32 of the ring body 30
The distance from the proximal end to the distal end may be formed so as to protrude so as to be "same or longer" than the distance for crushing the water stop ring 40 in the coaxial direction so as to press against the outer surface of the tube.

First, when the formation size of the locking claw 32 is "the same as the moving distance of the ring body 30", the sleeve body 20 is screwed into the connecting device main body 10 in the tube insertion direction. The locking claw 32 penetrates and penetrates the outer surface of the tube, and the ring body 30 moves accordingly, and the water stop ring 40
, And the water stop ring 40 exhibits a water stop effect.
For this reason, it is possible to prevent the occurrence of water leakage or the like due to insufficient crushing of the water stop ring 40.

Further, when the formation size of the locking claw 32 is formed to be "longer than the moving distance", the size of the locking claw 32 has more allowance than in the case of "the same". Therefore, even if the above-mentioned insertion of the locking claw 32 into the outer surface of the tubular body is not sufficient at the time of construction, the ring body 30 moves as much as necessary to crush the water stop ring 40. Therefore, the ring body 30 is the water stop ring 4
0 is securely crushed, and the water stop ring 40 is
This makes it possible to prevent the occurrence of water leakage or the like from the connection device 100 by closely adhering to the pipe inserted into the tube.

The outer surface of the ring body 30 near the base end of the elastic locking piece 31 is provided with a contact portion 33 over the entire circumference.
Is formed, and this contact portion 33 is sandwiched between one end of the connection device main body 10 and the inner step portion of the sleeve body 20 to regulate movement of the sleeve body 20 in the direction opposite to the insertion direction of the tubular body. Is also good. With this configuration, it is possible to prevent abrasion of the water blocking ring 40 due to friction between the pipe and the water blocking ring 40 due to repeated movement of the pipe body, This is because it is possible to prevent a decrease in the water stopping effect of the connection device due to the above.

The material for forming the ring body 30 is preferably a material mixed with glass fiber or the like so as to have a hardness capable of biting into the outer surface of a synthetic resin tube (for example, a crosslinked polyethylene tube). Is a polyphenylene sulfide (Polyphenylene Sulfide)
(Hereinafter, referred to as “PPS”)).

The sleeve body 20 is connected to the connection device main body 10.
When the ring body 30 is moved in the direction opposite to the insertion direction of the tube, the regulation of the ring body 30 is released at the same time, the ring body 30 moves in the direction opposite to the insertion of the tube body, and the elastic locking pieces 31 May return to the shape before the deformation and release the engagement with the tube. With this configuration, the pipe can be freely attached to and detached from the connection device 100 according to the present invention, and even if a worker mistakenly connects the pipe at the construction site, the pipe can be easily replaced. It becomes possible.

The water stop ring 40 is connected to the connection device main body 10.
The ring member 30 is disposed near the pipe contact surface.
Is pressed by the movement of the pipe, and is pressed against and closely adhered to the pipe inserted into the connection device 10, thereby exhibiting a water stopping effect. Any material or shape may be used as long as it has such an effect, but specifically, an O-ring made of synthetic rubber may be used.

The connection device body 10 and the sleeve body 20
It is also useful to configure the following at the screwed portion with

That is, 1 or 2 is attached to the end face of the sleeve body 20.
The above recess 21 is formed. On the other hand, in the connection device main body 10, one or more projecting portions 11 having a shape corresponding to the concave portion 21 may be formed. Thereby, it is possible to prevent the sleeve body 20 from being loosened from the connection device main body 10, and it is possible for an operator to recognize an accurate tightening position when the sleeve body 20 is tightened to the connection device main body 10. Things. The shape or number of these concave portions 21 and projecting portions 11 may be appropriately determined.

It is also conceivable to provide one or more protruding pieces 12 as stoppers at the connection portion of the connection device body 10 with the sleeve body 20. This protruding piece 12
Is to prevent the sleeve body 20 from being unnecessarily screwed into the connection device main body 10 from the time of product shipment of the connection device 100 to the time of construction on site. By adopting the suspended structure, the ring body 30 and the water stop ring 40 are not subjected to the load by the sleeve body 20 until the pipe body is inserted, so that the pipe body can be inserted smoothly.

It is conceivable that the stopper relating to the protruding piece 12 is provided so as not to be easily bent before construction, and to have a strength set such that it can be easily bent by an operator during construction. .

The invention of the present application is configured as follows based on the above constituent requirements. That is, the water stop ring 40 is provided near the pipe contact surface inside the connection device main body 10,
The ring body 30 is arranged so as to overlap with the water stop ring 40 so that the water stop ring 40 can be crushed, and the sleeve body 20 is provided so as to include the water stop ring 40 and the ring body 30. With this configuration, the following operation is achieved. That is, after the pipe is inserted into the connection device 100, the sleeve 20 is moved by screwing in the insertion direction of the pipe, and the ring 30 is formed by the taper formed on the inner peripheral surface of the sleeve 20. The locking claw 32 formed at the tip of the elastic locking piece 31 is pressed. The locking claw 32 is formed so that the tip of the elastic locking piece is bent at an acute angle, and protrudes in the insertion direction of the tube. The hanging locking claw 32 pierces the outer surface of the tubular body by the pressing of the sleeve body 20 and enters toward the tip end of the locking claw 32. Along with this,
The ring body 30 itself moves in the tube insertion direction. The movement of the ring body 30 crushes the water stop ring 40,
By bringing the pipe into close contact with the pipe inserted into the connection device 100, the pipe is connected and the water stopping effect is exhibited.

The connecting device 100 according to the present invention has this part as one of its features. Therefore, as long as the components satisfy the above components, the other components are included in the technical scope of the present invention regardless of how they are changed.

Now, the most preferred embodiment of the invention based on the above technical idea will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 shows a connecting device 100 for a synthetic resin tube according to Embodiment 1. The connection device 100 according to the first embodiment includes a connection device main body 10, a sleeve body 20, a ring body 30, and a water stop ring 40 (not shown).

First, as shown in FIG. 1, the connection device main body 10 has a substantially cylindrical shape made of PPSu.
The end connected to the other tube forms an internal thread on the inside,
The outer periphery is formed in the shape of a hexagonal nut and can be connected to a synthetic resin tube. On the other hand, the other end (screwed portion) of the connection device main body 10 is provided with a water stop ring 40 for preventing leakage from the connection device 100 and withdrawal of a synthetic resin tube connected to the other. Ring body 30 for stopping
A male screw is formed so as to be screwed with the sleeve body 20 which is screwed with the inside.

FIGS. 1 to 3 show the connection device main body 10.
As shown in each of the figures, two projections 11 are provided at the lowermost end of the screwing surface relating to the screwing portion of the connection device body 10 with the sleeve body 20, and two projections 11 are provided below these two projections 11. Is formed with a slit. These projecting portions 11 are formed so as to correspond to the shape of a concave portion 21 formed in a sleeve body 20 described later. The protrusion 11 and the recess 2
By the combination of 1, a structure like a ratchet is formed, and "slack" of the sleeve body 20 from the connection device body 10
And the sleeve body 20 is connected to the connection device body 1
When tightening to zero, it is possible for an operator to recognize an accurate tightening position.

Further, two protruding pieces 1 as stoppers are provided at a connection portion of the connection device body 10 with the sleeve body 20.
2 are provided. The protruding pieces 12 prevent the connection device 100 according to the present embodiment from unnecessarily screwing the sleeve body 20 into the connection device main body 10 from the time of product shipment to the time of construction on site. By adopting a suspended configuration, the ring body 30 and the water stop ring 40 are inserted until the pipe is inserted.
However, since the load is not imposed by the sleeve body 20, the pipe body can be inserted smoothly. The stopper is set so as not to be easily bent before construction (during transportation of a product, etc.), and to have such strength that it can be easily folded by an operator during construction.

Next, as shown in FIG. 1 or FIGS. 4 to 6, the sleeve body 20 is formed of PPSu, and has a cylindrical shape penetrating the entirety. The peripheral surface is formed so as to contract (to have a tapered shape) toward the tube insertion end, and includes a ring body 30 described later. On the other hand, a female screw is formed on the inner peripheral surface of the other end portion which is screwed with the connection device main body 10 so as to be screwed into and out of the connection device main body 10 freely.

As shown in FIG. 1, the ring body 30 has a plurality of elastic locking pieces 31 extending in the direction opposite to the insertion direction of the tubular body.
In addition, a locking claw 32 is provided at the tip of each of the plurality of elastic locking pieces 31. The ring body 30 is formed of a cylindrical body formed of PPS. By forming a plurality of slits in one of the cylindrical bodies, a plurality of elastic locking pieces 3 are formed.
1 are formed. Further, an abutting portion 33 is formed on the outer surface near the root of the elastic locking piece 31 so as to be continuous over the entire circumference, and the abutting portion 33 is connected to one end of the connection device main body 10 and the inner step portion of the sleeve body 20. And the sleeve body 20 can be restricted from moving in the direction opposite to the insertion direction of the tube body.

The locking claw 32 provided at the tip of the elastic locking piece 31 of the ring body 30 is bent from the elastic locking piece 31 in the insertion direction of the tube at an acute angle to protrude therefrom.
The locking claw 32 is formed by the elastic locking piece 31 of the ring body 30.
The distal end has a sharp projection directed toward the insertion direction of the tubular body, and the distance from the base end to the distal end is the distance for crushing the water stop ring 40 in the coaxial direction so as to press the water stop ring 40 against the outer surface of the tubular body. It is formed to protrude so as to be longer.

The water stop ring 40 is provided inside the connection device main body 10, and in this embodiment, an O-ring made of synthetic rubber is used.

Next, the operation of each member in the connection device 100 according to this embodiment will be described with reference to the cross-sectional views of FIGS. First, the cross-sectional view shown in FIG.
5 shows a cross section with respect to the tube insertion direction of No. 0. The pipe is not yet inserted into the connection device 100 of FIG. A in FIG. 4 shows the size of the locking claw 32 formed by bending the tip of the elastic locking piece 31 at an acute angle.
Is the distance traveled to crush. In the molding step, the elastic locking pieces 31 provided on the ring body 30 are formed with the distal end portions of the respective elastic locking pieces 31 slightly released. Accordingly, since the distal end portion allows the tube to be inserted into the ring body 30 which has been slightly released, as shown in FIG. 5, the tube is smoothly connected to the connecting device 100 without being disturbed by the locking claws 32. Can be inserted into

FIG. 6 is a cross-sectional view of the connecting device 100 in which a tube is inserted, and the sleeve 20 is screwed into the connecting device main body 10 to be formed at the tip of the elastic locking piece 31 of the ring 30. A state where the pawl 32 is pressed to engage the tube is shown. In the connection device 100 shown in FIG. 6, the protrusion 12 provided on the connection device main body 10 is bent by screwing the sleeve body 20, and the restriction on the sleeve body 20 by the protrusion 12 is released. Can be screwed into the connection device main body 10.

For this reason, the locking claw 32 can be pressed by the inner peripheral surface of the sleeve body 20, and the locking claw 32 is stabbed into the tube and penetrates toward the distal end of the locking claw 32,
Along with this, the ring body 30 moves in the tube insertion direction,
The water stop ring 40 is crushed and is in close contact with the tube. The contact portion 33 provided on the outer periphery of the ring body 30
Is sandwiched between the sleeve body 20 and the connection device main body 10, and the ring body 3 is pressed by the sleeve body 20.
The movement in the axial direction of 0 is restricted by the thickness of the contact portion 33, thereby preventing the water stop ring 40 from being deformed beyond a certain limit.

(Embodiment 2) Next, the invention shown in FIG. 7 is a header 200 in which a connection device 100 is attached to a pipe connection portion. The header 200 is a liquid supply connected to a hot water supply pipe provided behind the wall. The hot water supply pipe connected to the header 200 is connected to each of the devices to be used as a liquid discharge section. To do.

The header 200 is formed of a heat-resistant synthetic resin such as cross-linked polyethylene. As shown in the figure, a pipe connection part to which a supply pipe is connected, and a water supply pipe described above are connected to each other. It has a plurality of pipe connections for distribution and distribution. The connection device 100 according to the present invention is attached to each pipe connection portion. This connection device 1
00 has the same configuration as that according to the first embodiment. In addition, since the pipe connection part to which a supply pipe is connected has a larger diameter than other pipe connection parts, the connection device 100 corresponding to this is also attached.

The connection device main body 10 may be formed integrally with the header 200. According to the suspended configuration, it is possible to further reduce the danger of water leakage and the like, and this is an effective means.

[0070]

According to the embodiment of the present invention described in detail above,
The following effects can be obtained. First, the connecting device for a synthetic resin tube of the invention according to claim 1 includes a connecting device main body to which the synthetic resin tube is connected, and the tube inserted therein, the axial direction of the inserted tube being inserted. A sleeve that is screwed into and out of the connection device main body along the connection device main body along with the sleeve body that is screwed into the connection device main body causes a locking claw formed on the distal end side to be attached to the outer surface of the tube body. A plurality of elastic locking pieces are provided extending in the direction opposite to the insertion direction of the tube so as to bite and close and deform so as to lock the tube, and a stopper disposed in the connection device body. A ring body that moves in the insertion direction of the pipe body so as to deform the water stop ring by pressing the sleeve body so as to press the water ring against the outer surface of the pipe body to stop water; The claw is engaged with the outer surface of the tubular body by the locking claw, and The hindered ring body movement of by pressing the over blanking body,
In order to prevent the crushing of the water blocking ring from becoming insufficient, the elastic locking piece is bent back at an acute angle in the insertion direction of the tube body and has a structural feature. It is.

According to the present invention, since the locking claw is formed by being sharply bent at the tip of the elastic locking piece, when the inner peripheral surface of the sleeve presses the tip of the ring,
The locking claw is inserted from the outer surface of the tubular body in a direction formed by folding back at an acute angle. Accordingly, the ring body moves toward the insertion direction of the tube by a distance corresponding to the depth of “piercing” of the locking claw with respect to the tube. Then, the ring body crushes the water-stop ring arranged near the lower end thereof, thereby bringing the water-tight ring into close contact with the pipe. That is, the ring body securely holds the pipe body, crushes and deforms the water stop ring, and tightly contacts the pushed-in pipe body, whereby water leakage from the connection device can be reliably prevented and the pipe body is This has the effect of being securely fixed.

Next, the connecting device for a synthetic resin tube according to the second aspect of the present invention is the connecting device for a synthetic resin tube according to the first aspect, wherein the ring body is a certain size or more of the water blocking ring. In order to prevent the crushing, a contact portion that comes into contact with the connection device main body is provided so as to restrict a certain amount or more of movement due to the pressing of the sleeve body.

According to the present invention, when the sleeve is pressed by the sleeve, the contact portion provided on the ring is brought into contact with the main body of the connection device, thereby preventing the water stop ring from being crushed by a certain amount or more by the ring. As a result, it is possible to prevent the water blocking ring from being crushed by a certain amount or more, thereby preventing an adverse effect such as breakage of the locking claw or deformation of the tubular body.

According to a third aspect of the present invention, there is provided a connecting device for a synthetic resin tube, wherein the movement of the ring body is restricted by the contact portion. In this position, the tube is sandwiched between the main body of the connection device and the sleeve to prevent the tube from moving in the direction opposite to the insertion direction.

According to the present invention, the movement of the pipe in the longitudinal direction due to a change in water pressure in the pipe can be suppressed. That is, by suppressing the movement of this tube,
The effect of preventing wear of the water stop ring due to friction between the pipe body and the water stop ring and preventing a decrease in the water stop effect of the connecting device due to wear of the water stop ring can be prevented. is there.

According to a fourth aspect of the present invention, there is provided a connecting device for a synthetic resin tube according to any one of the first to third aspects, wherein the locking claw of the ring member is formed of the pipe. The distance from the proximal end to the distal end in the axial direction of the body is protruded so as to be equal to or longer than the distance for crushing the water stop ring in the coaxial direction so as to press the water stop ring against the outer surface of the tube. It has features.

In the present invention, the formation size of the locking claw is
When the ring body is "same as the moving distance", the locking claw pierces the outer surface of the tube body by screwing the sleeve body into the tube insertion direction with respect to the connection device main body, and the ring body is accordingly moved. It moves and crushes the water stop ring, and the water stop ring exerts a water stop effect. For this reason, there is an effect that it is possible to prevent the occurrence of water leakage or the like due to insufficient crushing of the water stop ring.

When the formation size of the locking claw is “longer than the moving distance”, the “same”
There is more room for the size of the locking claw than in the case of. Therefore, even if the above-mentioned engagement claw is not sufficiently inserted into the outer surface of the tubular body at the time of construction, the ring body moves as much as necessary to crush the water stop ring. Therefore, the ring body surely crushes the water stop ring, and the water stop ring comes into close contact with the pipe inserted into the connection device, thereby making it possible to prevent the occurrence of water leakage or the like from the connection device. It is effective.

According to a fifth aspect of the present invention, there is provided a connecting device for a synthetic resin tube according to any one of the first to fourth aspects, wherein the ring member is connected to the connecting device main body. By returning the original shape of the elastic locking piece and the water blocking ring due to the retraction of the sleeve body with respect to the above, the locking by the locking claw and the pressure contact by the water blocking ring are released. Have

According to the present invention, when the restriction on the ring body by the sleeve body in the tube insertion direction is released, the elastic locking pieces of the ring body and the water stop ring return to their original shapes. In addition, the restriction on the pipe by the connection device is released and the pipe can be removed, and thus the pipe can be detachably attached to the connection device.

[Brief description of the drawings]

FIG. 1 is a diagram showing each component of a connection device 100 according to the present invention.

FIG. 2 is a front view of the connection device 100 according to the present invention.

FIG. 3 is a side view of the connection device 100 according to FIG. 2;

FIG. 4 is a cross-sectional view of the connection device 100 according to FIG. 2, showing a state where a pipe is not inserted.

FIG. 5 is a view showing a state where a pipe is inserted into the connection device 100 shown in FIG. 4;

6 is a view showing a state in which the sleeve body 20 of the connection device 100 according to FIG. 5 is moved in the housing direction, and the pipe body is fixed by the ring body 30. FIG.

FIG. 7 is a diagram showing a use state in which a connection device 100 according to the present invention is provided in a header 200.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Connection device main body 11 Projection part 12 Projection piece 20 Sleeve body 21 Depression 30 Ring body 31 Elastic locking piece 32 Locking claw 33 Contact part 40 Waterproof ring 100 Connection device for synthetic resin pipe 200 Header

Claims (5)

[Claims] 1. A connecting device main body to which a synthetic resin tube is connected, and said tube inserted, and screwed to said connecting device main body so as to be able to advance and retreat along an axial direction of said inserted tube. When the sleeve is pressed against the connecting device main body, the locking claw formed on the distal end side of the sleeve is bitten into the outer surface of the tubular body, and is closed and deformed to lock the tubular body. A plurality of elastic locking pieces extending in the direction opposite to the insertion direction of the pipe body, and a water stop ring arranged in the connection device body is pressed against an outer surface of the pipe body to stop water. A ring body that moves in the insertion direction of the tube so as to deform the water-stop ring by pressing the sleeve body. The locking claw moves to the outer surface of the tube body of the locking claw. Movement of the ring body by pressing the sleeve body In order to prevent the water stopping ring from being crushed insufficiently due to being hindered, the elastic locking piece is bent at an acute angle in the insertion direction of the tube from the elastic locking piece to protrude therefrom. Connection device for resin pipes. 2. The ring body has a contact portion that abuts on the connection device main body in order to prevent the water stop ring from being crushed by a certain amount or more to restrict a certain amount or more of movement due to the pressing of the sleeve member. The connecting device for a synthetic resin tube according to claim 1, wherein the connecting device is provided. 3. The ring body is sandwiched between the connection device main body and the sleeve body at a position where the movement is regulated by the contact portion, so that the tube body is prevented from moving in a direction opposite to the insertion direction. 3. The connecting device for a synthetic resin tube according to claim 2, wherein: 4. The distance from the proximal end to the distal end of the locking claw of the ring body in the axial direction of the pipe is the same as the distance of crushing the water stop ring in the coaxial direction to press the water stop ring against the outer surface of the pipe. The connecting device for a synthetic resin tube according to any one of claims 1 to 3, wherein the connecting device is protruded so as to be longer than that. 5. The ring body is locked by the locking claw and the water blocking ring is restored by returning the elastic locking pieces and the water blocking ring to their original shapes by screwing back the sleeve body with respect to the connection device body. 5. The connection device for a synthetic resin tube according to claim 1, wherein the pressure contact by the pressure is released.