JPH0626787Y2 - Plug-in type pipe fitting - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a pipe joint used, for example, for connecting water distribution pipes and the like, with a seal member (packing) having a special shape having both liquid tightness and pipe end corrosion resistance. The present invention relates to a plug-in type pipe joint incorporating a pipe withdrawal prevention ring having a function of preventing the connected pipe from being pulled out due to the pressure in the pipe or the like.

[Prior Art] Conventionally known pipe joints include a screw joint type, a flange joint type, a weld joint type, and a plug type such as a cap nut type.

Since the screw connection type requires thread cutting, it is troublesome to process and requires skill in manufacturing. Also, some experience is required to make an accurate pipe connection.

With the flange connection type, bolt tightening work at the work site is complicated, and uneven connection such as one-side tightening easily occurs,
The tubing connection may be incomplete.

The welded joint type has the drawback that only a person who has experience in welding can proceed with the work, and at the time of on-site construction, there is a risk of causing a fire.

In addition, all of the above three methods have a large bonding force and can perform strong bonding. Therefore, it is suitable when the pipe pressure is high. However, on the other hand, since the connecting portion lacks flexibility, there is a drawback that when a strong external force is applied due to an earthquake or the like, the parts other than the connecting portion are damaged and the damage is expanded.

Compared to the above three methods, the plug-in type is relatively easy to manufacture, has excellent workability, can perform work easily even if it is not a particularly skilled person, and is highly safe. It has advantages such as being out.

FIG. 10 is a view showing an example of a conventional plug-in type pipe joint and is a view quoted from Japanese Utility Model Application Laid-Open No. 57-190188.

In the figure, 1 is a pipe joint body, 2 is an inclined inner peripheral surface, 3 is an outer cylindrical portion, 4 is an inner cylindrical portion, 5 is a vertical surface, 6 is a collar, 7
Is a packing, 8 is a coil spring, and 9 is a pipe to be connected.

This plug-in type pipe joint moves the packing 7 in the direction of the arrow b by inserting the connected pipe 9 into the joint body 1 as shown by the arrow a and then slightly retracting it as shown by the arrow b.
By the movement of the packing 7, the coil spring 8 is pushed in the direction of the same arrow b, the coil spring 8 is contracted by the narrowing action of the inclined inner peripheral surface 2, and the coil spring 8 is bitten into the outer peripheral surface of the connected tube 9 to be connected. It is configured to prevent the escape of the.

[Problems to be Solved by the Invention] The above conventional plug-in type pipe joint has the following problems.

First, in the above conventional plug-in type pipe joint, the coiled spring 8 is bitten into the outer peripheral surface of the connected pipe 9 to prevent the connected pipe 9 from coming out. Must be made of a relatively soft material. That is, the plug-in type pipe joint has a problem that it can be applied only to the connected pipe 9 formed of a specific material.

Moreover, since the coil slip-out preventing force by the coil spring 8 is not so strong, if a strong pushing force due to the internal pressure of the pipe acts on the connected pipe 9, there is a risk that the pipe will come off relatively easily.

Furthermore, the sealing property of the packing 7 depends on the resilience of the material forming the packing 7. Therefore, when the material of the packing 7 is deteriorated and the repulsive force is reduced, the sealing property is also deteriorated, and there is a drawback that liquid leakage or the like is caused.

The plug-in type pipe joint has no means for removing the connected pipe 9. Therefore, if it is assumed that the connected pipe 9 can be sufficiently firmly connected by the pipe joint, the connected pipe 9 is pulled from the pipe joint body 1 even if a situation occurs in which the connected pipe 9 is to be removed. There is a problem that it cannot be removed.

Therefore, the first object of the present invention is that it is relatively easy to manufacture, has excellent workability, and that even a person who is not particularly skilled can easily perform the work and is highly safe. It can be applied regardless of the forming material of the pipe to be connected, and can perform stable and reliable pipe connection, there is no risk of the pipe coming out, etc. In addition, it is possible to release the pipe connection state in a timely manner Another object is to provide a plug-in type pipe joint.

A second object of the present invention is, in addition to the above-mentioned first object, that even if the packing material is deteriorated and the resilience is lowered, its sealing property is stably ensured, especially if the liquid pressure is high. A certain object is to provide a plug-in type pipe joint in which the sealing property is improved to some extent and there is no fear of liquid leakage due to the influence of liquid pressure.

A third object of the present invention is, in addition to the above second object, an effect of preventing the pipe end of the pipe to be connected from being corroded, minimizing the occurrence of unevenness in the pipe at the connection portion, and providing a very low fluid resistance. An object of the present invention is to provide a plug-in type pipe joint capable of connecting pipes.

[Means for Solving the Problems] In order to solve the above problems and achieve the object, the present invention takes the following means.

(1) In a plug-in type pipe joint for connecting mutually connected pipes having a large diameter portion at the pipe end and a small diameter portion near the pipe end adjacent to the large diameter portion, A joint body having flange portions projecting in the axial direction at both ends, and a diameter at the pipe end of a connected pipe that is attached to the inside of the cylinder of each flange portion of the joint body and is inserted from the outside of the joint body. After a large part is passed by its own elastic expansion, a pair of C-shaped elastic members, which are C-shaped elastic members, are engaged with the small diameter part near the pipe end of the connected pipe by its own elastic deformation. A ring, an outer surface of a large pipe end diameter portion of a pipe to be connected, which is mounted in a region existing between the pair of pipe extraction preventing rings, and is inserted into at least the inside of the joint body; Annular seal member that seals between It was to prepare for the.

Then, as a seal member, a main annular band portion corresponding to the "tread portion of the tire" that abuts the external surface with the internal surface of the joint main body, and the external surface is connected to the edge of the main annular band portion and the external surface is the pipe end diameter of the connected pipe. A side annulus corresponding to the "side wall part of the tire" to be brought into contact with the outer surface of the major part, and a "tire wheel rim insertion part" that is continuous with the side annulus and has its outer surface abutted against the pipe end surface of the pipe to be connected. And a bent edge corresponding to the above, and a slit-shaped opening for introducing a liquid is formed between the inner surfaces of the bent edge.

(2) In addition to the means of (1) above, as a seal member, the tip of the bent edge portion that abuts on the pipe end surface of the pipe to be connected is bent into an L shape to form a bent tip portion. At least, a pipe that is configured to engage with the concave portion existing on the inner surface of the large-diameter portion of the pipe end diameter of the connected pipe is used.

[Operation] As a result of taking the above means, the following operation occurs.

(1) Since it is a plug-in type pipe joint, it is a screw coupling type,
Compared to the flange joint type, weld joint type, etc., it is relatively easy to manufacture and has excellent workability, and anyone can easily perform the work even if they are not particularly skilled. And, it is very safe.

Then, on the inside of the cylinder of the flange portions at both ends of the joint body, C
A pair of tube pull-out prevention rings made of a V-shaped elastic member is attached. Therefore, when the pipe to be connected is inserted from the outside of the joint body, the large-diameter portion of the pipe end pushes the C-shaped elastic member and passes it. When the large diameter part has passed, C
The V-shaped elastic member is contracted and elastically deformed. As a result, the pipe withdrawal prevention ring engages with the small diameter portion near the pipe end of the connected pipe. In such a state, the pipe to be connected is locked by the pipe withdrawal prevention ring to prevent the pipe from coming out. Thus, no matter what material the connecting pipe is made of, pipe connection is possible. That is, it can be applied regardless of the material of the pipe to be connected. Moreover, stable and reliable pipe connection can be performed, and there is no risk of the pipe coming off.

Further, if the pair of pipe extraction preventing rings made of C-shaped elastic members are expanded and elastically deformed by using an appropriate tool, the pipe to be connected can be pulled out at a proper time. Therefore, if necessary, the pipe connection state can be released in a timely manner.

(2) When the connected pipe is inserted into the joint body, the large diameter portion of the connected pipe elastically deforms the tongue piece of the seal member and stretches it into a close contact state. Thus, the gap between the opposing pipe ends of the two connected pipes is sealed by the tire-like seal member. When the liquid flowing inside the pipe to be connected is introduced into the hollow portion of the seal member through the slit-shaped opening, the liquid pressure exerts an action force such that the entire seal member swells. Therefore, the outer surface of the seal member is pressed against the outer surface of the connected pipe and the inner surface of the joint body. As a result, even if the packing material is deteriorated and the resilience is lowered, the sealing property is stably secured. Then, the above action becomes more remarkable as the liquid pressure is higher, and the sealing property is improved. Thus, there is no risk of liquid leakage due to the influence of liquid pressure.

(3) Since the pipe edge of the connected pipe is covered by the bent edge portion of the seal member, the pipe end anticorrosion effect of the connected pipe is exhibited. In addition, the bent tip formed at the tip of the bent edge,
Since at least the concave portion existing on the inner surface of the large-diameter portion of the pipe end of the pipe to be connected is engaged, the occurrence of irregularities in the pipe at the connection portion can be minimized. Therefore, by combining with a pipe in which only the large-diameter portion is formed at the pipe end, it becomes possible to connect the pipes to be connected with the liquid resistance being extremely small.

[Embodiment] FIGS. 1 and 2 are views showing a first embodiment of the present invention.
FIG. 1 is a sectional view, and FIG. 2 is a front view corresponding to the case where FIG. 1 is viewed from below. In FIGS. 1 and 2,
Reference numeral 10 denotes a joint body having a cylindrical shape, for example, flange portions 10a. 10b
Is to have. Each flange portion 10a. A pair of C-shaped tube withdrawal prevention rings 11 and 12 made of an elastic member such as ABS resin is attached to the inside of the cylinder of 10b.

The pair of pipe withdrawal prevention rings 11 and 12 pass the large diameter portion 20a at the pipe end of the connected pipe 20 inserted from the outside of the joint body 10 by its own elastic expansion and then the connected pipe 20. The small diameter portion 20b near the tube end is engaged by its own contraction elastic deformation. In order to smoothly insert the connected pipe 20, tapered faces 11a and 12a are formed on the outer end faces of the pipe removal preventing rings 11 and 12, respectively, as shown in the drawing. Further, in order to reliably prevent the connected pipe 20 from being detached from the joint body 10, vertical faces 11b and 12b are formed on the inner end faces of the pipe withdrawal prevention rings 11 and 12, respectively, as shown in the drawing. A pair of tube removal prevention rings 11,
An annular seal member 1 is provided in the region between the two.
3 is installed.

The annular seal member 13 is formed of a material such as EPDM, and at least the outer surface of the large pipe end diameter portion 20a of the connected pipe 20 inserted into the joint body 10 and the joint body 10 are inserted. A liquid-tight seal is provided between the inner surface of the cylinder and the inner surface.

The seal member 13 has a car tire shape as a whole. That is, the main ring portion 13a corresponding to the "tread portion of the tire" whose outer surface contacts the inner surface of the joint body 10.
And a side annular band portion 13b corresponding to the "side wall portion of the tire" that is continuous with the end edge of the main annular band portion 13a and abuts the external surface on the external surface of the large pipe end diameter portion 20a of the connected pipe 20.
And a bent edge portion 13c corresponding to the "wheel rim insertion portion of the tire" that is continuous with the side ring band portion 13b and has an outer surface abutting the pipe end surface of the connected pipe 20. A slit-shaped opening S for introducing liquid is formed between the inner surfaces of the bent edge 13c. Thus, the pressurized liquid flowing inside the connected pipe 20 is introduced into the hollow portion H of the seal member 13.
The ring-shaped protrusion R having a mountain-shaped cross section is formed on the outer surface of the main ring portion 13a, that is, the surface contacting the inner surface of the joint body 10 mainly for the purpose of promoting liquid-tightness and increasing elastic deformation of the member. Are arranged at a predetermined pitch.

As shown in FIG. 2, the ends of the tube slip-out prevention ring 12 made of a C-shaped elastic member are opposed to each other with a gap G therebetween, and the opposite ends have projections 14 for positioning stoppers.
15 are provided. Protrusion 1 for positioning stopper
The gaps G at the opposite ends of the flanges 4 and 15 are the flange portions 10b.
The movement is allowed only between the cutout end edges 16a and 16b provided in the joint body 10, and the positioning is performed so that the existence of the facing end portion can be always confirmed from the outside of the joint body 10.
The tube pull-out prevention ring 11 is also provided with a similar projection, but it is not shown.

Next, the operation and effect of the plug-in type pipe joint of the present embodiment configured as described above will be described.

Since the pipe joint of this embodiment is a plug-in type pipe joint, it is relatively easy to manufacture as compared with a screw joint type, a flange joint type, a weld joint type and the like. Moreover, the workability is excellent, and anyone can easily perform the work even if they are not particularly skilled. Moreover, since there is no need to use a welding machine or the like for construction, it is highly safe.

By the way, both end flange portions 10a and 10b of the joint body 10
A pair of tube extraction preventing rings 11 and 12 made of C-shaped elastic members are attached to the inside of the cylinder. Therefore, when the pipe 20 to be connected is inserted from the outside of the joint body 10, the large-diameter portion 20a at the pipe end pushes the C-shaped elastic member and passes it. At this time, the large-diameter portion 20a and the seal member 13 are joined, and this point will be described later. When the large-diameter portion 20a has finished passing, the C-shaped elastic member is contracted and elastically deformed. Thus, the pipe removal prevention ring 1
Reference numerals 1 and 12 denote small diameter portions 20b near the pipe end of the connected pipe 20.
Engage with. In such a state, the connected pipe 2
0 is locked by the pipe withdrawal prevention rings 11 and 12,
Exit is blocked. Thus, no matter what material the connected pipe 20 is made of, the pipe connection can be made. That is, the pipe joint of the present embodiment can be applied regardless of the material of the connected pipe 20. Moreover, stable and reliable pipe connection can be performed, and there is no risk of the connected pipe 20 coming off.

The gap G between the opposite ends of the pair of tube withdrawal prevention rings 11 and 12 made of C-shaped elastic members is widened by using an appropriate tool so that the tube withdrawal prevention ring 11,
By subjecting 12 to elastic deformation, the pipe 20 to be connected can be easily removed at a proper time. Therefore, it is possible to release the pipe connection state as needed.

On the other hand, when the connected pipe 20 is inserted into the joint body 10, the large-diameter portion 20a of the connected pipe 20 elastically deforms and stretches the tongue-shaped side annular band portion 13b of the seal member 13,
It comes into close contact with the side ring band portion 13b. Thus, the gap between the opposing pipe ends of the two connected pipes 20 is sealed by the tire-shaped seal member 13. When the liquid flowing inside the connected pipe 20 is introduced into the hollow portion H of the seal member 13 through the slit-shaped opening S, the liquid pressure causes the seal member 13 to flow.
It receives an acting force that causes the whole body to expand. Therefore, the outer surface of the seal member 13 is the outer surface of the connected pipe 20 and the joint body 10.
Press against the inner surface of. As a result, even if the packing material is deteriorated due to long-term use and the resilience is lowered, its sealing property is stably secured. Then, the above action becomes more remarkable as the liquid pressure is higher, and the sealing property is improved. Thus, there is no risk of liquid leakage due to the influence of liquid pressure.

According to the experiments conducted by the present inventors, it has been confirmed that the tube can withstand a pressure of 20 kgf / cm ² or more.

Further, by the bent edge portion 13c of the seal member 13,
Since the pipe end of the connected pipe 20 is covered, it is possible to prevent the pipe end of the connected pipe 20 from being corroded by the liquid without any special treatment being applied to the pipe end.

Thus, when performing the pipe connection using the above pipe joint, after cutting the pipe 20 to be connected to a required length, a groove to be the small diameter portion 20b is formed near the pipe end using a dedicated tool. ,
The connection is completed simply by inserting this into the joint body 10.

The joint body 10 shown in FIG. 2 shows the flange portion 10b provided with the notch edge portions 16a and 16b. However, if the notch edge portions 16a and 16b are provided, the strength of the flange portion 10b is significantly reduced. There is a problem. Further, as the tube pull-out prevention ring 12, the one having the gap G at the opposite end is exemplified, but if there is the gap G, this portion is easily deformed or damaged when the connected pipe 20 is inserted. There is a problem.

FIG. 3 is a view showing a second embodiment of the present invention made in consideration of the above circumstances, and is a front view corresponding to FIG. 4 (a) and 4 (b) are a front view and a side view showing the tube withdrawal prevention ring 12 'made of the C-shaped elastic member shown in FIG.

As shown in FIG. 3, the joint body 10 'has a flange portion 10
b, a pair of windows 17a and 17b are provided instead of the notch edge, and a projection 18 is provided at an intermediate position between the pair of windows 17a and 17b.

On the other hand, as shown in FIGS. 4 (a) and 4 (b), the pipe withdrawal prevention ring 12 'is the same as that of the previous embodiment in that it is made of a C-shaped elastic member, but its opposite end portions 19M, 19N. Are tapered surfaces, and both tapered surfaces are in contact with each other so as to be in sliding contact with each other. And the opposite end portions 19M,
In the ring periphery near 19N, four protrusions 19a,
19b, 19c, and 19d are provided in a gear shape at predetermined intervals.

The tube withdrawal prevention ring 12 'has projections 19c and 19d.
Are inserted into the joint body 10 'in such a manner that the projections 18 provided on the joint body 10' are sandwiched therebetween. In this state, the protrusions 19a and 19b are in a state of being exposed through the windows 17a and 17b. Thus, when the operation of widening the interval between the protrusions 17a and 17b through the windows 17a and 17b is performed, the tapered surfaces of the opposite end portions 19M and 19N slide and the whole elastically deforms. Therefore, the connected pipe 20 once connected can be removed at a proper time.

The flange portion and the like on the opposite side of the joint body 10 'and the pipe withdrawal prevention ring are also configured in the same manner as above.

According to the second embodiment, since the flange portion 10b has no notch edge, it is possible to prevent the strength of the flange portion 10b from being significantly reduced. In addition, the tube slip-out prevention ring 12 '
However, since there is no gap G at the opposite ends and the tapered surfaces are in contact with each other so as to be in sliding contact with each other, the opposite ends 19M and 19N are deformed when the connected pipe 20 is inserted. It can be prevented from being damaged.

FIG. 5 is a sectional view showing a third embodiment of the present invention applied to the case of connecting two orthogonally connected pipes.

The present embodiment is different from the first embodiment in that an L-shaped joint body 30 is used as a joint body, and that the seal member 13 shown in the first embodiment is divided into two parts at its center portion as a seal member. Pair of seal members 33A and 33B of the above embodiment
Is attached to both ends 31, 32 of the tubular body of the joint body 30. Other than the above, it is the same as the first embodiment.

According to the third embodiment, basically the same operational effect as that of the first embodiment can be expected. However, in this embodiment, each of the seal members 33A and 33B is a perfect "tire shape".
However, it does not have the above-mentioned form, and has a form that deviates from the above-mentioned form. Therefore, compared with the first embodiment, the sealing property is slightly absent.

FIG. 6 is a partial sectional view showing a fourth embodiment of the present invention in which this point is improved.

In the present embodiment, the joint main body 40 has a first body at both ends thereof.
The seal members 43 having substantially the same form as the seal member 13 of the embodiment are used. Therefore, the same sealing performance as that of the first embodiment can be exhibited. Thus, the negative factor of the third embodiment is sufficiently eliminated.

FIG. 7 is a sectional view showing a fifth embodiment of the present invention. The present embodiment is basically different from the first embodiment in that a connected pipe 20 'having only a large diameter portion 20a and a small diameter portion 20b and not having a large diameter portion 20c is a connected pipe. This is the point used. Secondly, as a seal member corresponding to the connected pipe 20 ', the tip of the bent edge portion 53c, which is in contact with the pipe end surface of the connected pipe 20', is further bent into an L-shape to bend the tip end. 53d, and the point that this bent tip portion 53d is configured to be engaged with at least the concave portion existing on the inner surface of the large pipe end diameter portion 20a of the connected pipe 20 'is used.

According to this embodiment, the same operational effect as that of the first embodiment is obtained, and in addition, the bent tip portion 53 formed at the tip of the bent edge portion 53c.
Since d engages at least the concave portion existing on the inner surface of the large pipe end diameter portion 20a of the pipe 20 'to be connected, the occurrence of the unevenness in the pipe at the connecting portion can be minimized. That is, the connected pipe 20 'itself is a pipe body having no convex portion on the inner surface,
The concave portion existing on the inner surface of the large pipe end diameter portion 20a is in a state of being flatly filled with the bent tip portion 53d. Therefore, there is almost no unevenness in the pipe. Therefore, the pipe to be connected can be connected in a state where the fluid resistance is extremely small. In this way, it can be used satisfactorily as a pipe connection for various drainage systems.

FIG. 8 is a sectional view showing a sixth embodiment of the present invention. The present embodiment is different from the fifth embodiment in that a flange-like projection 51 having a large height is provided at the center of the inner peripheral surface of the joint body 50, and this projection 51 is used for abutting the pipe end of the connected pipe 20 '. The point is that it is used as a stopper. In accordance with this, as the seal member, a seal member 53 'having a shape whose central portion engages with the protrusion 51 is used.

According to this embodiment, the same effects as those of the fifth embodiment are obtained, and since the projection 51 functions as a stopper for abutting the pipe end, even if the connected pipe 20 'is strongly inserted, the connected pipe 20 'is not inserted excessively. as a result,
It is possible to avoid damage to the seal member 53 'due to excessive insertion of the connected pipe 20'.

FIG. 9 is a view showing a seventh embodiment of the present invention. This embodiment is an embodiment in which the purpose of the fifth embodiment is applied as it is when connecting two orthogonally connected pipes. Therefore, the L-shaped joint body 60 is used as the joint body, and the seal members 53A and 53B similar to the seal member 53 with respect to the mounting portions 63 and 64 of the both end portions 61 and 62 thereof.
Except for the two points of mounting, the structure is almost the same as that of the fifth embodiment shown in FIG. 7, and the same effect can be expected.

The present invention is not limited to the above embodiments,
Needless to say, various modifications can be made without departing from the scope of the present invention.

[Advantages of the Invention] According to the present invention, it is possible to provide a plug-in type pipe joint having the following effects.

First, it is relatively easy to manufacture, has excellent workability, can perform work easily even if it is not a particularly skilled person, and is highly safe, as well as forming the pipe to be connected. It can be applied regardless of the material, and stable and reliable pipe connection can be performed, there is no fear that the pipe will come out, and in addition, the pipe connection state can be released in a timely manner.

Secondly, in addition to the above-mentioned first effect, even if the packing material is deteriorated and the resilience is lowered, the sealing property is stably ensured, and the higher the hydraulic pressure is, the higher the sealing property is. There is no risk of liquid leakage due to the influence of liquid pressure.

Thirdly, in addition to the above-mentioned second effect, there is a pipe end anticorrosion effect for the pipe to be connected, and it is possible to minimize the occurrence of unevenness in the pipe at the connection portion, and it is possible to connect in a state where the fluid resistance is extremely low. Is.

[Brief description of drawings]

1 and 2 are views showing a first embodiment of the present invention,
FIG. 1 is a sectional view, and FIG. 2 is a front view corresponding to the case where FIG. 1 is viewed from below. FIG. 3 is a front view showing a main structure of a second embodiment of the present invention, and FIGS. 4 (a) and 4 (b) are a front view and a side view showing a tube extraction preventing ring of the same embodiment. FIG. 5 is a cross-sectional view showing a third embodiment of the present invention to which the present invention is applied when connecting two connecting pipes which are orthogonal to each other. FIG. 6 is a partial sectional view showing a fourth embodiment of the present invention in which the problem in the structure of FIG. 5 is improved. FIG. 7 is a sectional view showing a fifth embodiment of the present invention. FIG. 8 is a sectional view showing a sixth embodiment of the present invention. FIG. 9 is a cross-sectional view showing a seventh embodiment of the present invention, which is applied as it is when connecting two connected pipes orthogonal to each other to the spirit of the fifth embodiment. FIG. 10 is a diagram showing a conventional technique. 10, 30, 40, 50, 60 ... Joint body, 10a.
10b ... Flange part, 11,12 ... Pipe removal prevention ring, 13 ... annular seal member, 13a ... main ring band part, 13b ... side ring band part, 13c ... bent edge part, 13d
...... Bent tip, 14, 15 ...... Protrusions for positioning stopper, 16a. 16b ... Edges of cutouts, 17a, 17b
...... Window, 19M, 19N ...... Opposite end part consisting of tapered surface, 20, 20 '...... Connected pipe, 20a ...... Large diameter part, 2
0b ... small diameter part, S ... slit-like opening for introducing fluid, H ... hollow part, G ... gap.

Claims (2)

[Scope of utility model registration request] Claim: What is claimed is: 1. A plug-in type pipe joint for connecting mutually connected pipes each having a large-diameter portion at a pipe end and a small-diameter portion near the pipe end adjacent to the large-diameter portion. A joint body having a flange portion projecting in the axial direction at both ends of the body, and a pipe end of a connected pipe that is attached to the inside of the cylinder of each flange portion of the joint body and is inserted from the outside of the joint body. After passing through the large-diameter portion by its own elastic deformation, a pair of pipes made of C-shaped elastic members that engage with the small-diameter portion near the pipe end of the connected pipe by its own elastic deformation. A pull-out prevention ring, a pipe end diameter large outer surface of a pipe to be connected, which is mounted in a region existing between the pair of pipe pull-out prevention rings and is inserted into at least the inside of the joint body, and a tubular body of the joint body. An annular seal that provides a liquid-tight seal with the surface Comprising a member, the seal member includes a main ring band portion corresponding to the "tread portion of a tire" to abut the outer surface to the inner surface of the joint body,
A side annular band portion corresponding to the "side wall portion of the tire" that is continuous with the end edge of the main annular zone and has an outer surface in contact with the outer surface of the large diameter portion of the pipe to be connected, and is continuous with the side annular zone section. A slit-shaped opening for introducing liquid between the inner surface of the bent edge portion and a bent edge portion corresponding to "a wheel rim insertion portion of a tire" for bringing the outer surface into contact with the pipe end surface of the pipe to be connected. A plug-in type pipe joint characterized by being formed. 2. The seal member is formed into a bent tip by bending the tip of a bent edge portion abutting the tube end surface of the pipe to be connected into an L-shape, and the bent tip is at least the tube of the pipe to be connected. The plug-in type pipe joint according to claim 1, which is configured to engage with a concave portion existing on the inner surface of the large end diameter portion.