JPH11315964A - Fluid pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate energy of water pressure in a flow passage generated by water hammer so as to prevent the breakage of a valve element such as a flow passage and a water stop valve by constituting a fluid pipe main body by a soft resin made inner pipe and an outer pipe mounted outside of the inner pipe at prescribed intervals. SOLUTION: A flexible pipe 1 is formed as a double structure of an inner pipe 21 and an outer pipe 22, and the inner pipe 21 is composed of a soft resin made hose 210 and a helical spring 211 arranged along an inner wall of the hose 210 as a pipe diameter holding means. The outer pipe 22 is arranged for covering an outside of the inner pipe 21, and a cylindrical spacer 4 is arranged so as to interpose in one end side between the inner pipe 21 and the outer pipe 22. Since the inner pipe 21 is freely expanded, and pressure resistance property to pressure in a pipe body is not only arranged but also the pressure is absorbed and relieved. Even if very large pressure is generated in the pipe body by water hammer and the like, the inside of the flow passage is not broken by pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a fluid pipe.

[0002]

2. Description of the Related Art In a piping structure of a fluid pipe, for example,
As shown in FIG. 3, as a pipe directly attached to the water heater 100, a flexible pipe 200 that can be bent arbitrarily is generally used. As described above, since the flexible tube 200 is freely bendable, the water heater 100 and the water tube 300 can be easily connected to each other, which is very convenient.

Conventionally, a flexible pipe used as a fluid pipe such as the water heater 100 has a form in which a metal material such as stainless steel is formed in a cross section in a side view to have flexibility. General. The flexible tube having the above-described configuration is made of a metal material, although it is bendable, so that it is resistant to external impact and is waterproofed. It has excellent water resistance.

[0004]

One of the problems that has conventionally been encountered in the piping of fluid pipes is that the pipes or pipes that come from a water hammer (water hammer) resulting from a change in water pressure in the pipes. Of the member communicating with the member. That is, when a water hammer action occurs, a very large pressure is generated not only in the pipe, but also in the flow path of a water-related product such as a water heater, which is connected to the flow path of the liquid in the pipe. As a result, the plunger may be damaged by not only the piping but also the plumbing product and the valve.

[0005] As a protection measure against the above-mentioned water hammer action, it is conceivable to increase the strength of the fluid pipe to prevent breakage of the pipe. However, even if pipes having strength, such as iron pipes and pipes made of reinforced plastic, are used as fluid pipes, the large water pressure itself generated by the water hammer action does not decrease, so even if the pipes are not damaged However, there is still a possibility that the flow path of the plumbing product such as a water heater and the valve body such as a water shutoff valve may be damaged.

Therefore, it is conceivable to use an elastic soft resin pipe such as a rubber hose as a fluid pipe having excellent pressure resistance against pressure from the inside of the pipe. Even if a large water pressure is applied to the inside of the pipe due to the water hammer action, the rubber hose itself expands and contracts to function as a cushioning material, and absorbs the water pressure generated by the water hammer action. Therefore, even if a water hammer action occurs, there is no danger that the piping will be damaged, and that water-related products such as water heaters and valve bodies such as water stop valves will be damaged. However, a soft resin pipe such as a rubber hose has a lower strength than a metal material or a reinforced plastic, so that it has poor resistance to external impact and is easily damaged.

Therefore, the present invention has been made in view of the above problems,
Even if a water hammer occurs in the fluid pipe, it will not only be resistant to the large water pressure generated by this water hammer,
The water pressure energy itself in the flow path generated by the water hammer action is removed, and it is possible to prevent the flow path in a plumbing product such as a water heater or a valve body such as a water stop valve from being damaged. The purpose was to provide a fluid line.

[0008]

According to a first aspect of the present invention, there is provided a fluid pipe according to the present invention, wherein a fluid pipe body forming the fluid pipe includes a soft resin inner pipe and an inner pipe made of a soft resin. The outer tube is provided with a predetermined gap on the outside, and is provided with an outer tube.

In the above configuration, the soft resin inner tube is
As long as it is formed of a soft material having elasticity, it may be a natural resin or a synthetic resin, and is not particularly limited. For example, rubber, vinyl chloride, polyethylene, polypropylene, nylon, polystyrene, polyethylene terephthalate (PET), And mixtures thereof.

[0010] The predetermined gap is not particularly limited as long as the soft resin inner pipe has a space that can be expanded when a water hammer action occurs, but if the gap is too small, The outer pipe is damaged by the expanding force of the inner pipe,
The expansion of the inner pipe is suppressed by the outer pipe, and the energy of the water pressure generated by the water hammer action may not be sufficiently removed.If the gap is too large, the width of the fluid pipe becomes too large and the usability is increased. It gets worse. Further, the outer tube may be a metal tube such as iron or stainless steel, a hard resin tube such as reinforced plastic, or a flexible tube having flexibility. It may have a non-flexible form, and is not particularly limited.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the fluid tube has an outer tube having flexibility and a shape-retaining property for maintaining a bent state, and a soft resin. A pipe-shaped holding means for holding the cross-sectional shape of the inner pipe in a circular shape. As the form of the outer tube having the flexibility of the above-described configuration and the shape-retaining property of maintaining a bent state, for example, a stainless steel used for a general water heater or the like has a side view waveform. The formed flexible tube is well known, but is not limited to such a stainless steel flexible tube, and may be a flexible tube formed of another metal material or a synthetic resin material, and is particularly limited. Not done.

Further, the form of the tubular holding means is such that when the hose made of a soft resin is bent, it is possible to prevent the hose from being crushed and the internal flow passage from being blocked. It may take any form, and is not particularly limited, and includes, for example, a form in which a helical spring is attached along the inner wall of the inner tube. Furthermore, the fluid pipe according to claim 3 is:
In addition to the configuration according to claim 1 or 2, a check valve mechanism that unilaterally restricts the flow direction of the fluid is integrally fixed inside one end of the fluid pipe in a watertight state. Configuration.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a fluid pipe according to the present invention will be described below in detail with reference to the drawings. FIG.
1 is a side sectional view showing an embodiment of a fluid pipe according to the present invention. As shown in FIG. 1, a flexible pipe as a fluid pipe (hereinafter, simply referred to as a "flexible pipe").
1 includes a flexible pipe main body 2 and a distal end portion 3. The flexible pipe main body 2 is an inner pipe made of a soft resin (hereinafter, referred to as an inner pipe).
Only described as "inner tube". ) 21 and an outer tube 22.

The inner tube 21 is made of a soft resin hose (hereinafter referred to as a hose).
Only "Hose" is described. ) 210, and a helical spring spring (hereinafter, simply referred to as a “spring”) 211 as a tube-shaped holding means.
1 is provided along the inner wall of the hose 210. Further, an outer tube 22 is provided so as to cover the outer side of the inner tube 21, and a cylindrical spacer 4 is provided at one end between the inner tube 21 and the outer tube 22. . The outer tube 22 is a stainless steel tube formed in a corrugated shape in a side view so as to have flexibility.

The distal end portion 3 is composed of a distal end body 30 and a ring 34 provided at a connecting portion for joining to another pipe. The tip body 30 has a non-slip portion 32 at one end and a groove 33 into which a ring 34 is fitted at the other end.
Is fitted. In addition, a collar 5 is provided on a surface side of a portion where the flexible pipe main body 2 and the distal end portion 3 are joined.

The collar 5 is a portion of the distal end portion 3 where the non-slip portion 32 is provided. The collar 5 is formed of the flexible pipe main body 2 so as to clamp the inner pipe 21 and the outer pipe 22 with the spacer 4 interposed therebetween. It is provided so that it can be wound around. The distal end portion 3 also serves as a connecting portion for joining the flexible pipe 1 to another pipe. When the flexible pipe 1 is connected to another pipe using the cap nut A, the cap nut A (not shown) is used. And the tip 3 is sealed.

The flexible pipe 1 having the above-described configuration is similar to a conventionally used flexible pipe, and is a pipe for water supply and drainage (not shown) and a water heater (not shown). Used to intervene to connect to.
When the flexible pipe 1 is used as a water supply pipe such as a water heater, for example, when the water heater is stopped, the water flow in the flexible pipe 1 is suddenly stopped, so that a water hammer action occurs. An extremely large pressure is applied to the flow path in the flexible pipe 1 (including the inside of the water heater and the pipe for water supply and drainage).

However, the inner pipe 21 in the flexible pipe 1
Is formed by a soft resin hose 210,
The side wall of the inner tube 21 expands with respect to the water pressure and absorbs and removes the pressure. At this time, since there is a gap between the inner pipe 21 and the outer pipe 22, even if the inner pipe 21 expands, the expansion is not hindered by the outer pipe 22.

As described above, since the inner tube 21 can freely expand, the flexible tube 1 not only has a pressure resistance against the pressure inside the tube, but also absorbs and relieves this pressure. Therefore, even if a very large pressure is generated in the flow path due to a water hammer action or the like, the inner pipe 21 always absorbs the energy of the pressure, so that the inside of the flow path is not damaged by the pressure.

In addition, since the outer tube 22 is formed of stainless steel, the flexible tube 1 has the same resistance to external impacts as the conventional flexible tube made of stainless steel. There is no end. Further, the flexible pipe main body 2 bonded with the spacer 4 interposed between the inner pipe 21 and the outer pipe 22 can be attached to the distal end portion 3 by not only bonding and fixing, but also the outer pipe 22. Since the collar 5 provided on the outside and the non-slip portion 32 are also fixedly held therebetween, the stability is maintained even when the inner tube 21 and the outer tube 22 have a gap. Therefore, only the inner tube 21 and the outer tube 22 do not move.

In addition, a spring 211 is attached to the inner pipe 21.
Is provided, the hose 210 of the inner tube 21 is not crushed even when the flexible tube 1 is bent.

Next, another embodiment of the flexible pipe according to the present invention will be described. FIG. 2 is a side sectional view of a flexible pipe according to another embodiment having a check valve therein. As shown in FIG. 2, the flexible pipe 10 has a configuration in which a check valve mechanism 7 is provided in the configuration of the flexible pipe 1 described in the above embodiment. That is, the flexible pipe 10 includes a flexible pipe main body 12, a distal end portion 13,
And a check valve mechanism 7.

The basic structure of the flexible tube 10 is as follows.
It is the same as the flexible pipe 1, and the operation and effect are basically the same. However, since the check valve mechanism 7 is integrally fixed to the flexible pipe 10 in a watertight state,
The reverse flow of the water flow in the flexible pipe 10 can be prevented.

The check valve mechanism 7 includes a movable valve body 71 and a spring 7
2, a base 73, and an O-ring 74.
The movable valve body 71 has an umbrella shape, and a widened portion on the front side of the umbrella portion 711 is formed at the tip 13
The movable valve element contact portion 130, which is a reduced-diameter portion on the inner wall, is contacted. Also, an O-ring 74 for preventing liquid leakage is provided on the surface side of the umbrella portion 711, and when the umbrella portion 711 and the movable valve body contact portion 130 are in contact with the movable valve body contact portion 130. Liquid leaks do not occur between them.

The spring 72 is mounted such that one end is located on the back side of the umbrella portion 711 and the other end is located on the base portion 73, in a direction of blocking the flow path in the flexible tube 10, ie, The movable valve body 71 is urged in a direction opposite to the water supply direction. The base portion 73 is open at the center, and the handle portion 712 of the movable valve body 71 can be inserted into the open portion.

When the flexible tube 10 is used,
When the momentum of the water flow is strong and the water pressure on the water supply side is higher than a predetermined pressure, the movable valve body 71 is pushed and moved against the spring 72 so that water can be supplied, but the water pressure on the water supply side is lower than a predetermined pressure. When the pressure of the water flow is stopped or the flow of the water flow is stopped, the urging force of the spring 72 causes the O-ring 7 provided on the front side of the umbrella portion 711 of the movable valve body 71.
4 is pressed against the reduced diameter portion of the inner wall of the distal end portion 13 to prevent backflow. The base portion 73 shown in FIG. 2 is provided with a flow passage (not shown) so that water can flow between the inside of the check valve mechanism 7 and the flexible pipe main body 12.

The flexible pipe 10 having the above-described structure can prevent the backflow of the water flowing in the pipe in addition to the effect of the flexible pipe 1. In addition, since the check valve mechanism 7 is integrally provided in the flexible pipe 10 in a watertight state, there is no fear of water leakage or the like occurring.

Incidentally, the flexible pipe according to the present invention comprises:
It is not limited to the above embodiment. For example, in the above embodiment, as an example of using the flexible pipe, the case where the flexible pipe is used as a water supply pipe to a water heater is described. However, for example, the flexible pipe can be used as a cleaning pipe of a sewage tank.

Further, in the above embodiment, the spacer 4 provided for creating a gap between the inner tube and the outer tube is
Although the spacer is provided only at one place on one end side of the flexible pipe main body 2, the spacer 4 may be provided at several places between the inner pipe and the outer pipe of the flexible pipe main body 2.

[0030]

As described above, the fluid pipe according to the first aspect of the present invention has resistance only to a large water pressure generated by the water hammer even if a water hammer occurs in the fluid pipe. Instead of removing the water pressure energy itself in the flow path created by the water hammer action, preventing damage to the flow path in water-running products such as water heaters and valve elements such as water stop valves. can do.

Further, the fluid pipe according to the second aspect of the present invention, in addition to the effect of the first aspect, can freely bend the fluid pipe and maintain the bent state. Further, in this fluid pipe, the inner pipe made of a soft resin is provided with a tubular holding means, so that even if the fluid pipe is bent, the inner pipe does not collapse.

Further, the fluid pipe according to the third aspect has the effects described in the above two aspects, and in addition to being able to prevent the backflow of the water flowing through the pipe, the fluid pipe has a watertight property. Since the check valve is provided, no water leakage occurs.

[Brief description of the drawings]

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

FIG. 2 is a side sectional view showing a flexible tube 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]

 DESCRIPTION OF SYMBOLS 1, 10 Fluid pipe 2, 12 Fluid pipe main body 21 Inner pipe 211 Tubular holding means 22 Outer pipe 7 Check valve mechanism

Claims (3)

[Claims] 1. A fluid pipe main body forming a fluid pipe comprises a soft resin inner pipe, and an outer pipe which is provided outside the inner pipe with a predetermined gap provided. Fluid pipe. 2. An outer tube having flexibility and a shape-retaining property for maintaining a bent state, and a tube-shaped holding means for maintaining a circular cross-sectional shape of a soft resin inner tube. The fluid pipe according to claim 1. 3. The fluid pipe according to claim 1, wherein a check valve mechanism for unidirectionally restricting a flow direction of the fluid is integrally fixed in one end side of the fluid pipe in a watertight state. .