JP2000186796A - Pipe connecting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe connecting structure having good watertightness, capable of freely changing the pipe connecting direction, capable of preventing the end from being projected through a connecting port, and capable of easily performing connecting work. SOLUTION: An outer ring part 3a of a rubber pipe joint 3 having the outer ring part 3a formed by outward folding one end is fitted to a connecting port, the outer ring part 3a is pressed and fixed from inside by a fixing ring 5 to mount the rubber pipe joint 3 to the connecting port, and the end of a pipe 2 is inserted into the rubber pipe joint 3 to bring the outer peripheral surface of the pipe 2 into close-contact with the inner peripheral surface of the rubber pipe joint 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connection structure suitably used for connecting a drain pipe by forming a connection port on a side wall of a drainage basin.

[0002]

2. Description of the Related Art Conventionally, when a drain pipe is connected to a public basin which is a kind of drainage basin, a connection port is formed in a side wall of the public basin using a hole saw or the like, and an edge of the connection port is provided. A water-tight ring packing is fitted to the drain pipe.

[0003]

However, in the above connection structure, since the water tightness between the ring packing and the drain pipe is insufficient, unknown water (such as groundwater) infiltrates into the inside of the public basin. There was probably a fear of doing so.

Further, if the drain pipe is inserted obliquely to the connection port, the ring packing is distorted and the watertightness is further reduced, so that it is necessary to insert the drain pipe almost vertically to the connection port. There was a problem that the connection direction of the drainage pipe could not be freely changed.

Further, in the above connection structure, the end of the drainage pipe penetrates through the connection port and protrudes into the inside of the public basin. Therefore, when the inside of the public basin is inspected or cleaned, the drainage pipe protrudes inward. There was also a problem that the end of the was obstructed.

SUMMARY OF THE INVENTION The present invention has been made to address the above-described problems, and has as its object to provide good watertightness, to be able to freely change the connection direction of a pipe, and to have the end of the pipe connected. An object of the present invention is to provide a pipe connection structure that does not protrude through a mouth and can easily perform a connection operation.

[0007]

According to a first aspect of the present invention, there is provided a connecting structure for a pipe, wherein one end of the connecting port to which the pipe is to be connected is turned outward to form an outer ring portion. Along with fitting the outer ring portion of the rubber pipe joint, pressing and fixing the outer ring portion from the inside with a fixing ring, attaching the rubber pipe joint to the connection port, inserting the end of the pipe into the rubber pipe joint. The outer peripheral surface of the pipe is brought into close contact with the inner peripheral surface of the rubber pipe joint.

According to this pipe connection structure, the outer ring portion of the rubber pipe joint is pressed and fixed from the inside by the fixing ring and closely adheres to the connection port. In addition, since the outer peripheral surface of the pipe is in close contact with the inner peripheral surface of the rubber pipe joint, the water tightness between the rubber joint and the pipe is also ensured. Therefore, there is no danger of unknown water entering the connection structure of this pipe.

Further, as in this connection structure, when the outer ring portion formed by folding one end of the rubber pipe joint outward is pressed and fixed from the inside to the connection port by the fixing ring, the rubber pipe joint is deformed. The pipe can be freely swung as far as possible, so that the connection direction of the pipe can be changed freely.In addition, the rubber pipe joint can be pushed into the connection port and connected within the deformable range of the folded part. Since it can be pulled out from the mouth, a so-called exchange function can be exhibited.

In this connection structure, since the end of the pipe is inserted into the rubber pipe joint, it does not protrude through the connection port, and the rubber pipe joint can be easily attached with the fixing ring. be able to.

Next, according to a second aspect of the present invention, there is provided the pipe connecting structure according to the first aspect of the present invention, wherein the rubber pipe joint is formed such that one end thereof is bent outward in a substantially U-shaped cross section to form an outer ring portion. And an annular space portion inside the outer ring portion.

As in this connection structure, if there is an annular space inside the outer ring portion, the swing angle of the rubber pipe joint is further increased, and deformation of the folded portion having a substantially U-shaped cross section is also increased. , The size of the exchange becomes longer.

A third aspect of the present invention is a pipe connecting structure according to the first or second aspect of the present invention, wherein the rubber pipe joint has a fitting groove having a substantially U-shaped cross section on its outer ring portion. And a rim of a connection port is fitted into the fitting groove.

As in this connection structure, when the edge of the connection port is fitted into the fitting groove of the outer ring portion of the rubber pipe joint,
The concern that the position of the outer ring portion shifts and comes off the connection port is eliminated.

According to a fourth aspect of the present invention, there is provided a pipe connection structure according to the third aspect, wherein the fixing ring has a substantially U-shaped cross-sectional shape, and the outer ring portion of the rubber pipe joint is provided. Is fitted into the fixing ring.

This connection structure also eliminates the concern that the fixing ring is displaced and falls off.

According to a fifth aspect of the present invention, there is provided the pipe connecting structure according to any one of the first to fourth aspects, wherein the fixing ring is an open ring or a closed ring. It is characterized in that the outer ring portion is pressed from the inside by arranging it inside the outer ring portion of the rubber pipe joint and restoring it to the original perfect circular ring shape in a state where the diameter is increased.

In this connection structure, the rubber pipe joint can be attached to the connection port by a simple operation of simply restoring the reduced diameter fixing ring to the original round ring shape.
The workability of mounting the rubber pipe joint is improved.

According to a sixth aspect of the present invention, there is provided a pipe connecting structure according to the fifth aspect, wherein the fixing ring is an open ring, and both ends of the ring are closed when the diameter is reduced. When the portions are overlapped and restored, the protrusion formed at one end of the ring is fitted into a receiving hole formed at the other end to form a perfect ring shape.

Such an open ring-shaped fixing ring can be easily restored to a perfect circular ring shape by using a dedicated jig described later, so that the workability of mounting the rubber pipe joint is good, and the perfect circular shape is provided. When the ring shape is restored, the protrusion at one end fits into the receiving hole at the other end, and keeps pressing and fixing the outer ring part of the rubber pipe joint without returning to the reduced diameter state, so there is a concern that the rubber pipe joint may come off Absent.

According to a seventh aspect of the present invention, there is provided the pipe connecting structure according to the fifth aspect, wherein the fixing ring is a closed ring, and has two hinge portions.
When the diameter is reduced, the ring is folded inward at the hinge portion, and when the ring is restored, the ring is formed into a true ring shape without being folded at the hinge portion.

Such a closed annular fixing ring can be very easily restored to the original circular ring shape only by strongly pushing the folded hinge portion from the inside without using any dedicated jig or the like. Therefore, the mounting workability of the rubber pipe joint is further improved. Once restored to the perfect circular ring shape, it does not easily return to the reduced diameter state, so that there is no concern that the rubber pipe joint comes off the connection port.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view showing a pipe connection structure according to an embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view of the connection structure, and FIG. 3 (b) is a cross-sectional view of the connection structure in a state where the rubber pipe joint is pulled out, FIG. 4 is a cross-sectional view illustrating a connection operation procedure of the connection structure, FIG. 5 is a perspective view of a reduced diameter state of an open annular fixing ring used in the connection structure, FIG. 6 is an enlarged perspective view of one end of the fixing ring, and FIG. 7 is another side of the fixing ring. , FIG. 8 is a perspective view of a dedicated jig for restoring the fixing ring, FIG. 9 is a front view of the reduced diameter fixing ring with the dedicated jig attached, and FIG. FIG. 11 is a front view of the fixing ring restored to a perfect circular ring shape with a jig, and FIG. 11 is an enlarged cross-sectional view of a connecting portion at both ends of the fixing ring. .

The pipe connecting structure of the embodiment shown in FIGS. 1 and 2 is an example in which a pipe 2 (drain pipe) is connected to a side wall 1 of a public basin. A rubber pipe joint 3 is attached to the connection port.

The rubber pipe joint 3 is made of chloroprene, NB
A substantially tubular pipe joint made of a synthetic rubber or an elastomer such as R, PEDM, or the like, one end of which is folded outward in a substantially U-shaped cross-section to form an outer ring portion 3a having a large diameter, and the outer ring portion 3a Is formed with an annular space portion 3b. The outer race 3a is provided with a fitting groove 3c having a substantially U-shaped cross section.

The outer ring portion 3a of the rubber pipe joint 3 has a side wall 1
In a state in which the rim 4 of the connection port is fitted in the fitting groove 3c of the outer ring portion 3a, the connection port is pressed and fixed by the fixing ring 5 from the inside, and is mounted in a watertight manner.
When the edge 4 of the connection port is fitted into the fitting groove 3c in this manner, there is no need to worry about the position of the outer ring portion 3a being shifted and coming off the connection port.

The fixing ring 5 is an open-ring plastic ring as shown in FIG. 5, and has flange portions 5a and 5b formed at its front and rear edges, and has a substantially U-shaped cross section. It has a shape. And, as shown in FIG.
A protrusion 5c is formed at one end of the fixing ring 5, and a receiving hole 5d into which the protrusion 5c is fitted is provided at the other end of the fixing ring 5, as shown in FIG. Notches 5e, 5e into which the pair of claws are fitted are formed.

The flanges 5a and 5b are cut off at one end of the fixing ring 5. When the diameter of the fixing ring 5 is reduced as shown in FIGS. 5 and 9, the flanges are cut off. One end of the fixing ring enters the inside of the other end and overlaps.

The exclusive jig 6 for restoring the fixing ring 5 to the original perfect circular ring shape is formed by a substantially rectangular bent piece as shown in FIG. ,
6a is protruded, and between the claws 6a, there is a concave notch 6b into which the protrusion 5c of the fixing ring 5 can protrude. Therefore, as shown in FIG.
a into the notches 5e, 5e of the fixing ring 5,
When the exclusive jig 6 is rotated in the direction of the arrow as shown in FIG. 10, one end of the fixing ring 5 is pushed outward by the exclusive jig 6, and as shown in FIG.
The projection 5c at one end is fitted into the receiving hole 5d at the other end, and both ends of the fixing ring 5 are connected, so that the shape can be restored to a perfect ring shape as shown in FIG.

1 and 2, the outer ring portion 3a of the rubber pipe joint 3 is restored to its original perfect ring shape by a special jig 6 with the fixing ring 5 inserted in a reduced diameter state inside the outer ring portion 3a.
As shown in (1), the fitting groove 3c of the outer ring portion 3a is pressed and fixed from the inside in a state of being fitted into the fixing ring 5 having a substantially U-shaped cross section, and is attached to the connection port in a watertight manner. When the fitting groove portion 3c of the outer ring portion 3a is fitted into the fixing ring 5 having a substantially U-shaped cross section, there is no risk of the fixing ring 5 being displaced and falling off, and furthermore, it has a perfect circular ring shape. The restored fixing ring 5 has a protrusion 5c at one end and a receiving hole 5 at the other end.
Since the fitting groove portion 3c of the outer ring portion 3a is continuously pressed and fixed from the inside without being fitted into d and returning to the reduced diameter state, the rubber joint 3 does not come off from the connection port.

The end of the pipe 2 (drain pipe) is inserted and connected to the rubber pipe joint 3 attached to the connection port by the fixing ring 5 as described above, and further tightened from the periphery by the clamper 7. The inner peripheral surface of the pipe joint 3 and the outer peripheral surface of the pipe 2 are in close contact with each other to ensure watertightness. The clamper 7 is formed by bending both ends of an open metal belt and fastening the both ends with a fastening screw 7a or the like. However, various other clampers having a fastening mechanism may be used. It goes without saying that it may be tightened.

Next, a description will be given of an operation procedure for the pipe connection structure.

First, as shown in FIG. 4 (a), the rubber pipe joint 3 is turned upside down, and the outer ring portion 3a of the rubber pipe joint 3 is connected to the outside of the public box by connecting ports formed in the side wall 1 of the public box. The rubber pipe joint 3 is temporarily fixed to the connection port by inserting from the inside and fitting the rim 4 of the connection port into the fitting groove 3c of the outer ring portion 3a.

Then, as shown in FIG. 4B, after the outer ring portion 3a (fitting groove portion 3c) of the rubber pipe joint 3 is pressed and fixed from the inside with the fixing ring 5, as shown in FIG. Then, the rubber pipe joint 3 is turned over, and the rubber pipe joint 3 is attached to the connection port by protruding outward from the side wall 1 of the public box. The pressing and fixing work of the outer ring portion 3a of the rubber pipe joint 3 by the fixing ring 5 is performed by using the exclusive jig 6 to fix the fixing ring 5 inserted into the outer ring portion 3a in a reduced diameter state as described above. This can be easily performed by restoring to the perfect circular ring shape. In particular, since the rubber joint 3 is turned upside down, the pressing and fixing work is performed in a state where the exclusive jig 6 does not hit the rubber joint 3. Good workability.

Finally, as shown in FIG. 4D, the end of the pipe 2 is inserted into the rubber pipe joint 3, and the periphery thereof is tightened with the clamper 7, thereby completing the connection operation.

According to the pipe connection structure having the above-described structure, the watertightness between the outer ring portion 3a (fitting groove portion 3c) and the connection port of the rubber pipe joint 3, and the connection between the rubber pipe joint 3 and Since the water tightness between the end of the pipe 2 is ensured, infiltration of unknown water can be sufficiently prevented, and the end of the pipe 2 does not protrude into the public basin through the connection port. It does not interfere with internal inspection or cleaning work.

Further, the folded portion 3d of the rubber pipe joint 3 having a substantially U-shaped cross section is deformable, and the rubber pipe joint 3 can swing freely within the deformable range.
The connection direction (connection angle) of the pipe 2 can be variously changed as shown by the imaginary line, and the rubber pipe joint as shown in FIG. 3 can be pushed into the connection port, or the rubber pipe joint 3 can be pulled out from the connection port as shown in FIG. Therefore, the degree of freedom of the piping is increased, and the connection work is facilitated. In particular, when the annular space portion 3b is formed inside the outer ring portion 3a as in the rubber pipe joint 3, the swing angle of the rubber pipe joint 3 is further increased, and the cross section has a substantially U-shaped cross-section. The degree of deformation of the part also increases, and the size of the exchange becomes longer, so that the flexibility of the piping and the connection workability are further improved.

FIG. 12 is a perspective view of another fixed ring used in the pipe connection structure of the present invention in a restored state, FIG. 13 is a front view of the fixed ring in a restored state, and FIG. It is a front view of a diameter reduction state.

The fixing ring 50 is a closed annular plastic ring as shown in FIG. 12, and has flange portions 50a and 50b formed at its front edge and rear edge. A cut portion 50c and a V-shaped cut portion 50d are formed at two places of the fixing ring 50, and the thin bottom portions thereof are bendable hinge portions 50e and 50f. Therefore, when the fixing ring 50 is folded inward at one hinge portion 50f as shown in FIG. 14, the diameter thereof is reduced, and when the hinge portion 50f is pushed out from the inside, the fixing ring 50 shown in FIG.
2. The shape is restored to a perfect circular ring shape as shown in FIG.

When the outer ring portion 3a of the rubber pipe joint 3 is pressed and fixed from the inside by using such a fixing ring 50, as shown in FIG.
It may be inserted into the outer ring part 3a of the rubber pipe joint 3 while being folded inward at 0f and reduced in diameter, and the hinge part 50f may be pushed out from the inside by hand to restore the original true ring shape.

As described above, the fixing ring 50 can be easily restored simply by pushing and expanding the hinge portion 50f by hand without using a dedicated jig, so that workability is good, and once the ring is formed into a perfect circular ring shape. Since the diameter is not easily returned to the reduced diameter state when restored, there is no fear that the rubber pipe joint 3 comes off.

[0043]

As is apparent from the above description, the pipe connecting structure of the present invention can connect the pipe to the connection port in a water-tight manner, so that infiltration of unknown water can be sufficiently prevented, and the end of the pipe. Since it does not protrude through the connection port, it does not interfere with inspection and cleaning, and it is easy to install the rubber pipe joint with the fixing ring, and the connection angle of the pipe can be adjusted freely, Since there is also an exchange function, there is a remarkable effect that piping workability is greatly improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a pipe connection structure according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the connection structure.

FIG. 3A is a cross-sectional view of the same connection structure in a state where a rubber pipe joint is pushed in, and FIG. 3B is a cross-sectional view of the same connection structure in a state where a rubber pipe joint is pulled out.

FIG. 4 is a cross-sectional view for explaining a connection operation procedure of the connection structure. FIG. 4 (a) shows a state in which a rubber pipe joint is turned over and an outer ring portion is fitted to a connection port. b) shows the outer ring part of the rubber pipe joint pressed and fixed from the inside with a fixing ring, (c) shows the rubber pipe joint turned upside down, and (d) shows the rubber pipe joint The end of the tube is inserted and connected.

FIG. 5 is a perspective view of an open annular fixing ring used in the connection structure in a reduced diameter state.

FIG. 6 is an enlarged perspective view of one end of the fixing ring.

FIG. 7 is an enlarged perspective view of the other end of the fixing ring.

FIG. 8 is a perspective view of a dedicated jig for restoring the fixing ring.

FIG. 9 is a front view of the fixing ring in a reduced diameter state in which a dedicated jig is mounted.

FIG. 10 is a front view of the fixing ring restored to a perfect circular ring shape with a dedicated jig.

FIG. 11 is an enlarged sectional view of a connecting portion at both ends of the fixing ring.

FIG. 12 is a perspective view showing a restored state of another fixing ring used in the pipe connection structure of the present invention.

FIG. 13 is a front view of the fixing ring in a restored state.

FIG. 14 is a front view of the fixing ring in a reduced diameter state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Side wall of public square 2 Pipe 3 Rubber pipe joint 3a Outer ring part 3b Annular space part 3c Fitting groove part 3d Folding part 4 Edge part of connection port 5,50 Fixing ring 5a, 5b, 50a, 50b Flange part 5c Projection 5d receiving hole 50e, 50f hinge part 6 dedicated jig 7 clamper

Claims (7)

[Claims] 1. An outer ring portion of a rubber pipe joint having an outer ring portion formed by folding one end outward to a connection port to which a pipe is to be connected, and pressing the outer ring portion from the inside with a fixing ring. A pipe connection characterized in that the rubber pipe fitting is fixed to the connection port, the end of the pipe is inserted into the rubber pipe fitting, and the outer peripheral surface of the pipe is brought into close contact with the inner peripheral surface of the rubber pipe fitting. Construction. 2. An outer ring portion is formed by bending one end of the rubber pipe joint outward in a substantially U-shaped cross section, and has an annular space portion inside the outer ring portion. The pipe connection structure according to claim 1. 3. A rubber pipe joint having a fitting groove having a substantially U-shaped cross section provided around its outer ring portion, wherein an edge of a connection port is fitted into the fitting groove. Claim 1
Or the connection structure of the pipe | tube of Claim 2. 4. The fixing ring has a substantially U-shaped cross-sectional shape, and a fitting groove having a substantially U-shaped cross-section of an outer ring portion of the rubber pipe fitting is fitted into the fixing ring. Item 4. A pipe connection structure according to Item 3. 5. A fixing ring, which is an open ring or a closed ring, which is disposed inside the outer ring portion of the rubber pipe joint in a reduced diameter state to restore the ring shape to the original ring shape. The pipe connection structure according to any one of claims 1 to 4, wherein the portion is pressed from inside. 6. The fixing ring is an open ring,
When the diameter is reduced, both ends of the ring overlap, and when the ring is restored, the projection formed at one end of the ring fits into the receiving hole formed at the other end to form a perfect ring shape. The pipe connection structure according to claim 5, wherein: 7. The fixing ring is a closed ring,
It has two hinge portions, and when the diameter is reduced, the ring is folded inward at the hinge portion, and when the ring is restored, the ring does not be folded at the hinge portion and has a perfect circular ring shape. The pipe connection structure according to claim 5, characterized in that: