JPH03255295A - Coupling for water stop - Google Patents

Abstract

PURPOSE:To simply stop water in a simple constitution and to easily restore a coupling to be reused by forming water supply pipe connecting faucets on both end portions of a cylindrical main body, and making a soft tubular body closely adhere to the main body to cover the outside of the main body. CONSTITUTION:A coupling 1 for water stop has a plastic cylindrical main body 2, both end portions of which have larger diameters than the middle portion, the interiors of the large-diameter both end portions are taken as water supply pipe connecting faucets 2a, 2a, and the respective end portions of the water supply pipes 3, 4 formed by a vinyl chloride pipe or the like are inserted in the faucets 2a, 2a and stuck thereto. A soft tubular body 5 having the shape restoring ability is fitted to the outside of the main body 2 of the coupling 1 for water stop to closely adhere to the outer peripheral surface of the main body 2. A rubber ring-shaped body 6 may be installed between the main body 2 and the soft tubular body 5. Accordingly, at the time of new piping, the above coupling can be easily set in a designated position. Furthermore, water can be stopped, and even after water stop is released, the coupling can be easily restored and reused.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a water-stop joint used by being connected to a water supply pipe such as a water pipe.

[Conventional technology]

For example, water is supplied to each household through water pipes branched from main water pipes buried in roads and the like. In this case, polyvinyl chloride pipes (hereinafter referred to as PVC pipes) are used as water supply pipes, and each household is usually provided with a water stop valve on the downstream side thereof. These stop valves (sometimes part of the water pipe)
Not only in the case of damage or breakdown, but also in other cases, replacement or repair is performed as necessary. You will need to water it. Therefore, when it becomes necessary to stop the water, conventionally, as shown in FIG. The water is stopped by crimping an appropriate part of the water supply pipe B with a crimping machine C, and in this state, the water stop valve, etc. is replaced, and then the crimping is released and the crimped part B1 is replaced with a reinforcing joint. Work was being done to strengthen it. The reinforcement joints used at this time are
It is a cylindrical body with both ends used as connections for water supply pipes, and bag nuts (I), D, and D for fastening are attached to the connections, respectively, and is a relatively expensive means of connecting PVC pipes. .

[Problem to be solved by the invention]

However, when a water supply pipe made of a PVC pipe is crimped as described above, the crimped portion B1 buckles, so the pipe itself may be damaged during work at low temperatures or when the pipe is old. Also, even if such damage does not occur,
The strength of the buckled part (crimped point B) is significantly reduced, so when restoring and reusing it, a relatively expensive reinforcing joint as mentioned above must be attached to the buckled part. For installation, it is necessary to cut the pipe portion B2 downstream of the buckled portion, and furthermore, repair work is required for the cut portion. In addition, instead of stopping the water by crimping as described above, a technique is sometimes used to freeze the area where the water should be stopped, but this technique is used because it will not freeze if there is even a small amount of water flowing inside the pipe. There are problems in that the scope is limited and a qualification to handle high-pressure gas for freezing is required. The present invention addresses the above-mentioned conventional situation, and has a relatively inexpensive and simple configuration when it is necessary to shut off water at a position in a water supply pipe upstream of a water stop valve. To provide a water-stopping joint that can easily shut off water and can be easily restored and reused.

[Means to solve the problem]

In order to achieve the above object, the water stop joint according to the present invention has sockets for connecting water supply pipes formed at both ends of a cylindrical body, and a soft material on the outside of the body so as to fit closely to the outer periphery of the body. It is characterized by being fitted with a tubular body.

[For production]

According to the water stop joint having the above configuration, the water supply pipe is connected to the water supply pipe connection sockets formed at both ends of the cylindrical body by adhesive or the like, and By arranging it in a preferred position, the joint can be crimped to shut off the water when it becomes necessary to shut off the water. Even if the joint portion is deformed into a flat shape due to such crimping, the water-stop joint has a structure in which the soft tubular body is fitted tightly onto the outside of the cylindrical main body.
When restarting water flow, press both sides of the flattened joint in a direction that makes an approximately 90 degree angle with the crimping direction to bring the inner cylindrical body and outer soft tubular body into close contact. It can be easily restored or restored to its original state while remaining in place. In that case, even if the cylindrical body were to buckle due to crimping, sufficient watertightness would be ensured due to the soft tubular body being attached tightly to the outside of the cylindrical body. There is no possibility of water leaking from the bent portion. Therefore, according to this water stop joint, although it has a simple structure consisting of an inner cylindrical body and an outer soft tubular body, when water is cut off, the water supply pipe is crimped and buckled, or the water supply pipe is cut. This eliminates the need to attach a relatively expensive reinforcing joint to the buckled portion. In addition, once the above-mentioned water stop joint is placed at an appropriate position upstream of the water stop valve, water can be repeatedly shut off and passed by operating the joint as necessary. can. In other words, it can be used repeatedly as a water-stop joint.

【Example】

The present invention will be explained in detail below. FIG. 1 shows a water-stop joint according to the embodiment. This water-stop joint 1 includes a plastic cylindrical body 2 with both ends having a larger diameter than the middle part. Inside the large diameter ends are sockets 2a, 2a for connecting water supply pipes, and these sockets 2a, 2a are connected to water supply pipes (PVC pipes in this embodiment)
．． By inserting and gluing each end of 4, they can be connected in a predetermined state. A soft tubular body 5 having shape restorability is fitted onto the outside of the main body 2 of the water-stop joint 1 and is tightly attached to the outer circumferential surface of the main body 2. Further, particularly in this embodiment, a rubber ring-shaped body 6 and a rubber ring-shaped body 7 are installed between the main body 2 and the soft tubular body 5, as shown in enlarged view in FIG. 2.3. These rubber ring-shaped bodies 6 and rubber ring-shaped bodies 7 are arranged so as to be located near the innermost part of the number socket 2a, and when the main body 2 is damaged, the main body 2 and the soft tubular body 5 are separated. When the adhesion strength decreases, water flowing inside the main body 2 can be prevented from leaking through the gap created between the two. Here, the comb ring-shaped body 6 is not limited to one having a circular cross section like the one shown on the garden side.
It may have a cross-sectional shape as shown in FIG. In short, it is sufficient to have a shape that can be press-fitted to the main body 2 and the soft tubular body 5 to stop water. Further, as the material constituting the main body 2, for example, polyvinyl chloride, ABS, polystyrene, etc. are used, but they can be formed into a cylindrical shape and are water supply pipes (in this case, PVC pipes).3.
There is no particular limitation as long as it can be adhesively bonded to 4. Furthermore, the thickness (wall thickness) of the main body 2 is set according to the diameter of the water supply pipe 3.4, but the diameter is usually 13 for household use.
~50mm is used, so in that case 2
If the thickness is approximately 5 mm, adhesive bonding with the water supply pipe 3.4 can be performed with sufficient strength. On the other hand, the material constituting the soft tubular body 5 may be, for example, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, etc., or it may be formed into a tubular shape and can be brought into close contact with or adhered to the main body. If so, there are no particular limitations. In addition, the thickness of this soft tubular body 5 is 1 to 1 of the above body thickness if the water supply pipe has a diameter of 3 to 50 mm.
．． It is better to multiply it by 5 times. If the materials and thicknesses described above are selected for the main body 2 and the soft tubular body 5, it will have sufficient strength against water pressure and will easily return to its original state even after being pressed and deformed into a flat shape. can get. Next, the operation of the water-stop joint constructed as described above will be explained while describing how to use it. For example, when installing a new water supply pipe to a general household, etc., both sides of the cylindrical body 2 of the joint are placed so that the water stop joint 1 is located on the upstream side relatively close to the water stop valve (not shown). Socket 2a, upstream side of 2a (left side in the state of Fig. 1)
and the water supply pipe 4.3 on the downstream side (right side in the figure) are connected by adhesive or the like. With the water stop joint 1 installed in advance in this way, when it becomes necessary to shut off the water at a later date, for example due to a failure of the water stop valve, the intermediate part of the water stop joint 1 ( The small diameter portion) is crimped using a crimping machine 8 or the like as shown in FIG. As a result, the crimped portion deforms into a flat shape and closes the water flow passage, thereby stopping water from flowing downstream (toward the stopcock side), that is, in the direction of arrow a. Next, when restarting water flow after completing the prescribed work, place both sides of the joint portion that has been deformed into a flat shape about 90 degrees in the crimping direction.
Press inward in the direction of a degree angle. At this time, since the water-stop joint 1 has a structure in which a soft tubular body 5 having shape recovery properties is closely fitted to the outside of the cylindrical body 2, the flattened portion as described above is pressed. By doing so, the water stop joint 1 can be easily restored to its original state while the inner cylindrical body 2 and the outer soft tubular body 5 are in close contact with each other. Moreover, even if the cylindrical body 2 is buckled or damaged due to the above-mentioned crimping, the soft tubular body 5 is attached to the outside of the cylindrical body 2 in close contact with the cylindrical body 2, and between the two there is a rubber ring-shaped body 6 and a rubber annular body 5. Since the body 7 is attached, sufficient strength and watertightness are ensured. This reliably prevents water from leaking from that part when the cylindrical main body 2 buckles. In this way, the water stop joint 1 has a simple structure consisting of the inner cylindrical body 2 and the outer soft tubular body 5, but unlike the conventional water stop joint 1, the water supply pipe is crimped and buckled when water is stopped. It is possible to do the work of cutting the water supply pipe and attaching a relatively expensive reinforcing joint to the buckled part. 1, the joint can be crimped and restored as necessary to repeatedly shut off water and allow water to pass through.Therefore, it can be used repeatedly as a joint for water shutoff. Not only is it economical, but
There is no need to install a separate reinforcing joint at the water stop,
Furthermore, water shutoff and water flow operations can be easily performed even at low temperatures or under running water, improving work efficiency. In particular, when the entire structure is made of plastic like the water stop joint l of this example, the corrosion resistance required for the part when it is buried underground to form a water passage, for example, is sufficiently high. Being satisfied becomes something you can do. In the above embodiments, the water stop joint 1 may have a socket shape, a register shape whose diameter changes in the axial direction, or a vent shape with a bend in the middle. It is. By using water-stop joints with different shapes as needed, they can be easily installed anywhere, and in some cases, it is also possible to omit part of the pipe joint.

【Effect of the invention】

As described above, according to the water stop joint of the present invention, it can be easily set in a predetermined position, for example, when installing new piping, and although it is relatively inexpensive and has a simple configuration, it is not necessary after the joint is installed. Not only can the water be easily shut off, but also it can be easily restored and reused even after the water shutoff is released.

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a front view showing the appearance of the lower half of the water-stop joint according to the embodiment, and a front view showing the upper half in cross section; 3 and 3 are partially enlarged views, and FIG. 4 is an end view showing another cross-sectional shape of the comb ring. Moreover, FIG. 5 is a front view showing an example of a conventional water-stopping operation using a reinforcing joint. ■...Water stop joint, 2...Main body, 2a...Socket, 5...Soft tubular body.

Claims (1)

[Claims] (1) It has a cylindrical body, with sockets for connecting water supply pipes formed at both ends thereof, and the outside of the body is covered with a soft tubular body so as to fit tightly onto the body. A water-stop fitting featuring: