JPH0574385B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to a fire hydrant valve used in a fire hydrant in a building or the like, and more particularly to a fire hydrant valve that facilitates the opening operation of the valve.

b. Conventional technology When using a fire hydrant in the event of a fire, the hose stored in the storage box is pulled out, one firefighter holds the water nozzle, and another firefighter opens the hydrant valve to let water flow through. Fire extinguishing work is underway. Therefore, when there is only one firefighter, the water pressure at the hydrant is so high that it is virtually impossible to open the hydrant valve while holding the water discharge nozzle.

Therefore, a fire hydrant valve as shown in Fig. 5 is used, which can be easily operated by a single firefighter.

In this fire hydrant valve, a cylindrical inner pipe 3 is slidably fitted into a right-angled outer pipe 2 which is rotatably fitted into a water supply port 1, and a cylindrical inner pipe 3 is fitted between the outer pipe 2 and the inner pipe 3. is O
Lindas 4 and 5 are arranged to obtain watertightness. On the other hand, a fire hose 6 is attached to the tip of the inner pipe 3.
A nozzle (not shown) is attached to the tip of the fire hose 6.

In the event of a fire, the user opens the main valve of the fire hydrant, goes to the fire scene with the nozzle, and pulls the fire hose 6. When the inner pipe 3 slides, the outer pipe 2 and the inner pipe 3 communicate with each other. By this, from the outer pipe 2 to the inner pipe 3
Water flows through it and water discharge begins.

c. Problems to be Solved by the Invention According to such conventional fire hydrant valves, although they can be operated by one firefighter, the water pressure in the outer pipe 2 acts on the side of the inner pipe 3, When the water pressure is 4Kg/ ^cm2 , the pulling force is 12Kg, and when the water pressure is 7Kg/ ^cm2 , the pulling force is 20Kg.
Kg is required, so it was necessary to pull the inner tube 3 with considerable force when opening the valve. For this reason, when a person who is inexperienced with the operation or a person with weak strength such as a woman tries to pull the fire hose 6, the inner pipe 3 does not slide and water starts to be discharged. There were times when it wasn't done.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and provide a fire hydrant valve that can be easily operated even by a weak person such as a woman.

d Means for Solving the Problems In order to solve the above problems, the present invention provides an L-shaped outer tube that is connected to a water supply port through one open end and has a flow path formed in an orthogonal direction; The base of the hose is connected to the tip, and the rear end is fitted coaxially with the other open end of the outer tube, blocking the flow path, and the inner tube is supported by the outer tube and is connected to the inner tube. and a valve body fitted into the inner tube, forming a passage that communicates a space on the proximal end side of the outer tube blocked by the inner tube with a space on the rear end side of the inner tube, and through the passage. A certain amount of water is allowed to flow into the space at the rear end of the inner tube,
In a fire hydrant valve that opens by sliding the inner pipe using the water pressure after a predetermined time, the outer pipe serves as a passageway that communicates the space on the proximal end side of the outer pipe with the space on the rear end side of the inner pipe. The reason lies in the fact that a spiral groove is carved into the inner circumferential surface of the

e Function According to the fire hydrant valve configured as described above, when the water supply port of the fire hydrant is opened or the pump start button is pressed, water from the proximal end of the outer pipe passes through the spiral groove on the inner peripheral surface of the outer pipe and reaches the rear end of the inner pipe. Water gradually flows to the side, and the water pressure at the end of the inner tube gradually increases. In this way, water pressure acts on the rear end of the inner tube, and by pulling the hose slightly, the inner tube slides and the valve opens. On the other hand, even if you do not pull the hose, after a certain period of time,
When the space on the rear end side of the inner tube becomes full, the inner tube slides due to water pressure acting on the rear end side of the inner tube, opening the valve.

f Examples The present invention will be described in detail below with reference to illustrated examples.

FIG. 1 and FIGS. 2a and 2b are partial sectional views showing a right-angled fire hydrant valve, and FIG. 3 is a perspective view showing a front-folding fire hydrant box.

In FIG. 3, the fire hydrant box 10 is equipped with a front-folding door 12 on the front of the box main body 11, and two shafts 13 are protruded from the back side of the door 12 at a predetermined interval. A fire hose 14 is wound around this shaft 13 to support it. Two fire hoses 14 are connected and stored, with a nozzle 15 attached to one end of one fire hose 14, and a nozzle 15 attached to one end of the fire hose 14.
One end of 4 is connected to an inner pipe of the fire hydrant valve 16, which will be described later.

This fire hydrant valve 16 will be explained with reference to FIG. 1 and FIGS. 2a and 2b.

This fire hydrant valve 16 includes an L-shaped outer pipe 18 connected to a water supply port 17, and a cylindrical portion 1 of this outer pipe 18.
9 and an inner tube 20 that is partially slidably fitted into the valve.By sliding the inner tube 20, the valve opens and closes the flow path. The outer tube 18 has a claw portion 21 biased by a spring (not shown) on the inner surface of the opening end on the water supply port 17 side, and is rotatably fitted into the water supply port 17 via the claw portion 21. There is.

A valve body 22 is disposed on the axis of the cylindrical portion 19 of the outer tube 18.
is supported, and when the inner tube 20 is fitted into or separated from the valve body 22, the valve is opened and closed. The valve body 22 includes a valve body 23 and an O-tang 2.
4, and is supported on the closed end wall surface 19a of the cylindrical portion 19 by a bolt 26 and a nut 26a passing through the insertion hole 25 at the center thereof.

A spiral groove 27 is carved into the inner circumferential surface of the rear end portion of the cylindrical portion 19 of the outer tube 18 as a passageway that communicates the space on the proximal end side of the outer tube 18 and the rear end side space of the inner tube 20. There is.

Water flows into the rear end space of the inner tube 20 through this spiral groove 27, and water pressure acts on the rear end surface of the inner tube 20, causing the inner tube 20 to slide. The pulling force is adjusted by adjusting the area S of this rear end end surface. For example, if the water pressure is 4Kg/cm ² and the area S of the inner pipe 18 end face is 4.4cm ² , then 17.6Kg/cm 2
A water pressure of cm ² acts on the end face of the inner tube 18, allowing it to be easily pulled out. On the other hand, the time it takes for the inner tube 18 to be pulled out depends on the pitch and depth of the groove 27 and the inner tube 1
8 Adjust by the volume Q on the rear end side. Volume Q
can be adjusted by adjusting the length of the bolt 26 and changing the position of the valve body 22.

The water spray nozzle 15 is supported by a holder 29 attached to the back side of the door 12.
The fire hose 14 can be pulled out by holding it and running.

The function of the fire hydrant valve described above is as follows.

In the event of a fire, the firefighter first opens the door 12, presses the alarm switch to report the occurrence of a fire, and presses the pump start switch.

Next, when the water spray nozzle 15 is removed and the fire hose 14 is moved toward the fire point, the fire hose 14 is moved toward the shaft 1.
3, and the fire line valve 16 changes direction following the extending direction of the fire hose 14.
Then, when the fire hose 14 is fully extended and pulled, the inner pipe 20 connected to the base of the fire hose 14 slides, and the inner pipe 20 separates from the valve body 22. The valve is opened. At this time, since the water pressure of the water flowing in through the groove 27 is acting on the end surface of the rear end of the inner tube 20, the valve can be opened with a small amount of force.

As a result, water is passed toward the water spraying nozzle 15, and water spraying work can begin. Thus,
Fire extinguishing operations can be carried out quickly and smoothly by one firefighter.

In addition, when a person who is not familiar with fire hydrants or a weak person such as a woman is trying to extinguish a fire, they should hold the water spray nozzle 15, head toward the fire point, and after a certain period of time pass through the groove 27 and release the water at the rear end of the inner pipe 20. Space B is filled with water that has flowed into it. In this way, the inner tube 20
When the water pressure acting on the end face of the rear end reaches a predetermined pressure,
The inner tube 20 is forcibly slid and separated from the valve body 22, opening the valve. As a result, even people who are inexperienced in operating the fire extinguisher or those with limited strength can easily carry out fire extinguishing activities.

g. Effects of the Invention As described above, according to the fire extinguishing valve of the present invention, water flows into the rear end space of the inner pipe through the spiral groove and water pressure is applied, so that it is easy to pull the fire hose. Since the valve can be easily opened by operation, fire extinguishing operations can be easily carried out by a single fire extinguisher. In addition, the valve can be automatically opened after a certain period of time without having to pull the fire hose, making it easy to extinguish a fire, even for people who are inexperienced in operating it or who are weak, such as women. be able to.

[Brief explanation of the drawing]

1a and 1b are cross-sectional views showing a fire hydrant valve according to an embodiment of the present invention, FIG. 2 is a partial cross-sectional view showing the outer cylinder of FIG. 1, and FIG. FIG. 4 is a perspective view showing a front-folding fire hydrant box, and FIG. 5 is a sectional view showing a conventional fire hydrant valve. 10... Fire hydrant box, 14... Fire hose, 15... Nozzle, 16... Fire hydrant valve,
18... Outer pipe, 20... Inner pipe, 22... Valve body, 2
7...Groove.

Claims (1)

[Claims] 1. An L-shaped outer tube connected to a water supply port through one open end and forming a flow path in an orthogonal direction;
The base of the hose is connected to the tip, and the rear end is fitted coaxially with the other open end of the outer tube, blocking the flow path, and the inner tube is supported by the outer tube and is connected to the inner tube. and a valve body fitted into the inner tube, forming a passage that communicates a space on the proximal end side of the outer tube blocked by the inner tube with a space on the rear end side of the inner tube, and through the passage. In a fire hydrant valve that allows a certain amount of water to flow into a space on the rear end side of the inner pipe, and after a predetermined period of time, the water pressure causes the inner pipe to slide and open, the space on the proximal end side of the outer pipe. A valve for a fire hydrant, characterized in that a spiral groove is carved in the inner circumferential surface of the outer tube as a passageway communicating with the space on the rear end side of the inner tube.