JPH11315989A - Fluid pipe with check valve mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent reverse flow of a fluid by carrying out the same operation as that normal piping are joined with each other by fixing a check valve mechanism for unilaterally restricting a circulation direction of the fluid integratedly with one end of a fluid pipe, in a condition in which water tightness is provided on an inner wall surface of the fluid pipe. SOLUTION: A check valve mechanism 3 is composed of a main body contact part 30 which is brought into contact with a flexible pipe main body 2, a movable valve element 31, an O-ring 32, and a spring 33. The main body contact part 30 is bonded and fixed in a condition in which water tightness is provided on a check valve mechanism contact part 23, and is provided with a small diameter part 301 whose inner diameter is shortened by increasing a wall thickness larger approaching toward an end part side. The movable valve element 31 becomes a condition in which a passage in the flexible pipe 1 is closed unless water pressure exceeds energizing force. Since the flexible pipe 1 is provided with the check valve mechanism 3 beforehand, it is possible to easily prevent reverse flow of water feeding without arranging the check valve mechanism on the way of a piping.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid pipe provided with a check valve mechanism in a fluid pipe.

[0002]

2. Description of the Related Art Conventionally, in a piping structure of a fluid pipe,
2. Description of the Related Art A check valve mechanism for preventing a backflow of a fluid is provided in the middle of a pipe. For example, as shown in FIG. 3, in a water supply pipe to the water heater 100, a structure in which the water stop valve 200 and the water heater 100 are connected by a flexible pipe 300 is most common. At this time, a check valve mechanism is required around the water stop valve in order to prevent the water sent into the water heater 100 from flowing back.

Therefore, as a form of a check valve mechanism in a conventional piping structure, a special water stop valve provided with a check valve mechanism in a water stop valve or a general check valve and a check valve can be used. A form in which the same effect as the check valve mechanism is achieved by using a valve together, or a form in which a check valve mechanism is attached between pipes to prevent backflow by adopting a piping structure There is.

[0004]

However, the special water stop valve provided with the conventional check valve mechanism as described above has a problem that the structure becomes complicated and the cost increases.
In addition, the size of the water stop valve increases, and water stop valves provided with various types of check valve mechanisms must be prepared in accordance with various specifications, so that parts management becomes complicated. There is also.

[0005] When two components, a water stop valve and a check valve, are used in combination, the length of the connection portion becomes long, making piping in a limited space difficult, and the appearance is not clean. There is. Further, when a check valve mechanism is attached between the pipes, a gap is formed between the pipe and the check valve mechanism, and water leakage may occur from the gap. Further, when a large water pressure is applied to the gap, the gap may become large and the joint of the pipe and the check valve mechanism may be damaged.

Accordingly, the present invention has been made in view of the above problems,
In a fluid pipe piping structure, the same operation as connecting ordinary pipes without having to install a check valve mechanism in the water stop valve or attaching a check valve mechanism between the pipes The object of the present invention is to provide a fluid pipe in which a check valve mechanism capable of reliably preventing a backflow of a fluid is provided in a pipe in a watertight state by simply performing the above.

[0007]

In order to achieve the above object, a fluid pipe with a check valve mechanism according to the first aspect of the present invention unilaterally restricts a flow direction of a fluid at one end of the fluid pipe. The check valve mechanism is configured to be integrally fixed to the inner wall surface of the fluid pipe in a watertight manner. Note that the fluid pipe in the above configuration is, for example, a well-known flexible pipe in which a metal or resin material such as stainless steel used as a water supply pipe of a water heater or the like is formed into a pipe having a corrugated shape in a side view. It is mentioned as a form. However, the form of the fluid pipe is not limited to the form described above.
A tube made of a soft synthetic resin such as a rubber hose may be used, and a tube having no flexibility such as an iron tube or a tube made of a hard synthetic resin may be used without any particular limitation. Further, the fluid pipe may have a single-layer structure made of only one kind of material or a multi-layer structure made of plural kinds of materials, and is not particularly limited.

According to a second aspect of the present invention, there is provided a fluid pipe with a check valve mechanism, wherein the fluid pipe is formed of a soft resin inner pipe and an outer side of the soft resin inner pipe. A flexible outer tube which is provided with a predetermined gap, and is provided with a tube-shaped holding means for holding the soft resin inner tube in a circular cross section. Configuration. The width of the gap between the inner pipe and the outer pipe in the fluid pipe is
When a water hammer occurs due to a sudden change in the flow of the liquid flowing through the inner tube, the inner tube expands freely to absorb the water pressure generated by the water hammer. The width is not particularly limited as long as the space can be secured. As the soft resin, for example, even natural resin such as rubber, polyvinyl chloride,
It may be a synthetic resin such as polyethylene or polyurethane, and is not particularly limited as long as it is formed from a flexible resin material.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of a fluid pipe with a check valve mechanism according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional side view showing an embodiment of a fluid pipe with a check valve mechanism according to the present invention.

As shown in FIG. 1, a flexible pipe as a fluid pipe with a check valve mechanism (hereinafter referred to as a "flexible pipe")
It is written. 1) The flexible pipe main body 2 has a check valve mechanism 3
It has a configuration with. The flexible pipe main body 2
It comprises a tip portion 20 having no flexibility and a flexible portion 21 having flexibility. The tip 20 has a cylindrical shape,
A flange 22 is formed outward at the end, and a flexible portion 21 is formed on the side opposite to the end where the flange 22 is formed.
It is connected to one. In addition, the inner peripheral wall portion of the distal end portion 20 has a check valve mechanism contact portion 23 that makes the check valve mechanism 3 contact.
It has become. The flexible portion 21 has flexibility by forming the peripheral wall of the tubular body into a waveform in a side view.

The check valve mechanism 3 includes a main body contact portion 30 that comes into contact with the flexible pipe main body 2, a movable valve body 31, an O-ring 32, and a spring 33. Body contact part 30
Is provided with a small-diameter portion 301, which is adhesively fixed to the non-return valve mechanism contact portion 23 in a water-tight manner, and has a smaller inner diameter due to an increase in the wall thickness nearer to the end.
The movable valve element 31 has an umbrella shape including an umbrella section 311 and a handle section 312, and the umbrella section is adjusted so that the axial center of the movable valve element 3 is on the center axis of the check valve mechanism 3. 311 is provided so as to shield the small diameter portion 301. Umbrella part 311
An O-ring 32 is provided around the periphery. Also,
A spring 33 provided on the back side of the umbrella portion 311 urges the movable valve body 31 toward the small diameter portion 301.

Since the movable valve element 31 is urged toward the small-diameter portion 301, unless the umbrella portion 311 and the O-ring 32 abut on the small-diameter portion 301 without a gap, and the water pressure does not exceed the urging force, The flow path in the flexible pipe 1 is in a shielded state. The flexible tube 1 having the above-described configuration hooks the small-diameter portion 40 of the cap nut 4 on the collar 22,
Although not shown, it can be connected to a pipe on the water supply side or a water stop valve.

The flexible tube 1 formed as described above
Since the check valve mechanism 3 is provided in advance, it is possible to easily prevent the backflow of the water supply without disposing the check valve mechanism in the middle of the pipe. In addition, flexible pipe 1
Since the flexible pipe main body 2 and the check valve mechanism 3 are adhered over a wide range by the check valve mechanism contact portion 23 and the main body contact portion 30 to have water tightness, the check valve Water does not leak from the bonding portion between the mechanism 3 and the flexible pipe main body 2.

Next, a second embodiment of the present invention will be described. FIG. 2 is a side sectional view showing a flexible pipe (hereinafter, simply referred to as “flexible pipe”) 5 as a fluid pipe according to another embodiment of the present invention. As shown in FIG. 2, the flexible pipe 5 is
And a check valve mechanism 7.

The flexible pipe main body 6 includes an inner pipe 60 and an outer pipe 63, and a gap is provided between the inner pipe 60 and the outer pipe 63. The inner tube 60 is made of a rubber hose 62.
As a tubular holding means for holding the cross-sectional shape of the rubber hose 62 in a circular shape, a helical spring spring (hereinafter, referred to as a spring spring) provided along the inner wall of the rubber hose 62.
Only described as "spring." ) 61, and a rubber hose 62 is attached to the check valve mechanism 7 so as to be watertight. The outer tube 63 is a tube made of stainless steel, and is formed such that the peripheral wall has a waveform in a side view so as to have flexibility. Also, the inner pipe 60
A spacer 64 having a cylindrical shape and a predetermined thickness is attached between the outer tube 63 and the outer tube 63, that is, on the outer periphery of the inner tube 60 and on the inner periphery of the outer tube 63. The thickness of the cylindrical portion of the spacer 64 is equal to the inner tube 60 and the outer tube 6.
3 is the size of the gap. further,
A collar 65 is provided around the outer circumference of the outer pipe 63, and the collar 65 sandwiches the flexible pipe main body 6 and the check valve mechanism 7 to form the inner pipe 60, the outer pipe 63, and the outer pipe 63 of the flexible pipe main body 6. Spacer 64 and check valve mechanism 7
Are fixed together. That is, the flexible pipe main body 6 is attached in a watertight manner by the collar 65 and the flexible pipe main body contact portion 71 of the check valve mechanism 7.

As described above, the check valve mechanism 7 is fixed to the flexible pipe main body 6 by the method of bonding by the adhesive described in the first embodiment, the collar 65, and the rubber hose 62. Except that the flexible pipe main body 6 is fixed by sandwiching the flexible pipe main body 6 between the flexible pipe main body contact portion 71 and that the shape is slightly different from the check valve mechanism 3. Is substantially the same as in the first embodiment.

With the above construction, even if a water hammer action occurs when the faucet is closed suddenly, the rubber hose 62 of the inner pipe 60 inside the flexible pipe main body 6 is not used. It serves as a cushioning material to prevent the flexible pipe main body 6 or the check valve mechanism 7 from being ruptured by water pressure. The outer pipe 63 covering the outer periphery of the flexible pipe main body 6 has a role as a protective cover for the inner pipe 60, and a gap is provided between the inner pipe 60 and the outer pipe 63. Therefore, it is possible to prevent the inner pipe from being damaged by an external impact, an external projection, or the like. Further, the outer pipe 63 has a role of maintaining the curved state when the flexible pipe 5 is bent and constructed in a predetermined curved state.

Along the peripheral wall of the rubber hose 62,
Since the spring 61 is provided, even if the flexible pipe main body 6 is bent, the rubber hose 62 provided inside is prevented from being crushed to reduce the cross-sectional area. Of course, since the check valve mechanism 7 is integrally fixed to the flexible pipe main body 6 so as to have water tightness, there is no gap between the flexible pipe main body 6 and the check valve mechanism 7, There is no need to worry about leaks.

The fluid pipe with a check valve mechanism according to the present invention is not limited to the above embodiment. For example, in the first embodiment and the second embodiment, a flexible pipe having flexibility is used as a fluid pipe, but a flexible pipe such as an iron pipe or a hard resin pipe is used. Alternatively, a tube having the same properties may be used. Also,
As a form in which the check valve mechanism is integrally fixed inside one end side of the fluid pipe, adhesive fixing is performed in the first embodiment, and adhesive fixing and clamping fixing by a collar are performed in the second embodiment. However, a form in which they are integrally fixed by screwing or a form in which they are integrally formed at the time of molding may be used.

Further, the form of the fluid pipe main body is not limited to the above-described form in which a flange is provided at an end of the fluid pipe body and piping is performed on the flange via a cap nut. Any form may be used as long as it has a suitable piping structure.

[0021]

As described above, in the fluid pipe with the check valve mechanism according to the first aspect of the present invention, the check valve mechanism is integrally fixed to one end of the flexible fluid pipe. The backflow of the liquid can be reliably prevented. In addition, since the fluid pipe and the check valve mechanism are integrated in a watertight state, the liquid flowing through the pipe does not leak. Furthermore, since the above-mentioned fluid pipe with a check valve mechanism is provided with a check valve mechanism in the fluid pipe in advance, the check valve mechanism is not attached at the time of piping work, and the work is facilitated. The fluid pipe with a check valve mechanism according to claim 2 of the present invention has, in addition to the effects described in claim 1, the fluid pipe is composed of an inner pipe and an outer pipe, and the inner pipe is made of a soft resin. Is formed,
Moreover, since the flexible outer pipe is provided with a predetermined gap, even if a water hammer occurs, the inner pipe becomes a buffer and the fluid pipe and the check valve mechanism are damaged. Is prevented. In addition, the fluid pipe with the check valve mechanism according to the second aspect is provided with a tubular holding means along the inner wall of the soft resin pipe, so that even if the fluid pipe main body is bent, the internal soft resin pipe is formed. To prevent the cross-sectional area from becoming small.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing one embodiment of a fluid pipe with a check valve mechanism according to the present invention.

FIG. 2 is a side sectional view showing a fluid pipe with a check valve mechanism according to another embodiment of the present invention.

FIG. 3 is an explanatory diagram showing an example of piping around a water heater.

[Explanation of symbols]

 Reference Signs List 1 fluid pipe with check valve mechanism 2 fluid pipe body (fluid pipe) 3 check valve mechanism 5 fluid pipe with check valve mechanism 6 fluid pipe body (fluid pipe) 60 inner pipe 61 pipe holding means 62 rubber hose (soft (Resin pipe) 63 Outer pipe 7 Check valve mechanism

Claims (2)

[Claims] 1. A check valve, wherein a check valve mechanism for unidirectionally restricting a flow direction of a fluid is integrally fixed to one end of a fluid pipe in a watertight manner with respect to an inner wall surface of the fluid pipe. Fluid pipe with mechanism. 2. A fluid pipe comprising: a soft resin inner pipe; and a flexible outer pipe which is provided outside the soft resin inner pipe with a predetermined gap provided therebetween. The fluid pipe with a check valve mechanism according to claim 1, wherein the pipe is provided with a pipe-shaped holding means for holding the cross section of the soft resin inner pipe in a circular shape.