JPS6235496Y2 - - Google Patents

Description

[Detailed explanation of the idea]

a. Field of Industrial Application The present invention relates to a fire hydrant valve used in a fire hydrant in a building, etc., and relates to a fire hydrant valve that facilitates the valve opening operation and improves durability. b Prior art 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, extinguishing the fire. work is being done. 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 (hereinafter referred to as a follow valve) is used, as shown in Fig. 1, which can be easily operated by a single firefighter. This follow valve is connected to the main valve (not shown)
A right-angled outer pipe 2 rotatably fitted to the water supply port 1 of the
A cylindrical inner tube 3 is slidably fitted into the outer tube 2.
Gaskets (or C-rings) 4 and 5 are arranged between the inner tube 3 and the inner tube 3 to ensure watertightness. On the other hand, a fire hose 6 is attached to the tip of the inner tube 3, and a nozzle (not shown) is attached to the tip of the fire hose 6. In the event of a fire, open the main valve, go to the fire scene with the nozzle and pull the fire hose 6, the inner pipe 3 will slide, the outer pipe 2 and the inner pipe 3 will communicate, and the follower valve will be opened. opens. As a result, water flows from the outer tube 2 through the inner tube 3, and water discharge is started. Although such conventional follow valves can be operated by a single fire extinguisher, the water pressure inside the outer pipe 2 acts on the side of the inner pipe 3, and when the valve is opened, a considerable force is applied to the inner pipe. I had to subtract 3. Further, when the inner tube 3 is suddenly pulled out, the seal 4 for ensuring watertightness between the outer tube 2 and the inner tube 3 jumps out or protrudes from the seal groove 2a, causing loss of valve function. The reason for this is that the air in the space inside the follow valve is pressurized and compressed when the main valve is opened, and then when the inner tube 3 of the follow valve is pulled out, the gasket 4 in the gasket groove 2a suddenly closes at the end of the inner tube 3. The goal is to become free. As a result, the pressurized air in the packing groove 2a expands all at once, and the packing 4 is ejected by this force. c. Purpose of the invention The present invention solves the drawbacks of the prior art described above, improves durability, maintains sufficient watertightness, and provides a fire hydrant that can be easily operated by a single firefighter. The purpose is to provide valves. d. Structure of the invention Hereinafter, the invention will be described in detail with reference to illustrated embodiments. FIG. 2 is a perspective view showing a fire hydrant box with a front-folding door, and FIGS. 3 and 5 are partial sectional views showing a right-angled fire hydrant valve. In FIG. 2, a fire hydrant box 10 is equipped with a front-folding door 12 on the front side of a box 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, and one end of one fire hose 14 is equipped with a water discharge valve 15, and one end of the other fire hose 14 is connected to a fire hydrant valve (hereinafter referred to as a follow valve). ) 16, which will be described later. This follow valve 16 will be explained with reference to FIG. This follow valve 16 is connected to the water supply port 17 of the main valve through one open end, and has an L-shaped outer pipe 18 with a flow path formed in an orthogonal direction. The valve is composed of a cylindrical inner tube 20 that is partially slidably fitted into the cylindrical portion 19 at the top and blocks the flow path, and is opened and closed by sliding the inner tube 20. be. The outer tube 18 has a fitting part 21 provided with a spring-biased claw part (not shown) on the inner surface of the opening end on the side of the water supply port 17, and is connected to the water supply port 17 through the fitting part 21. It is attached so that it can rotate. The cylindrical portion 19 of the outer tube 18 is formed with one side closed and the other side open, and the inner tube 20 is fitted through the opening while blocking the flow path on the fitting portion 21 side. A fastener 23 having a packing (or C-ring) 22 disposed on the inner peripheral surface is screwed onto the inlet side of the cylindrical portion 19, and is in pressure contact with the outer peripheral surface of the inner tube 20. On the other hand, a packing groove 19a is formed in the innermost inner peripheral surface of the cylindrical portion 19, and a packing (or C-ring) 2 is formed in the packing groove 19a.
4 are installed inside. When the follow valve is closed, the outer pipe 18
The distal end of the inner tube 20 located at the same position as the packing groove 19a or innermost than the packing groove 19a is provided with a fourth groove.
As shown in the figure, holes 25 serving as air vent passages communicating between the inside and outside of the inner tube 20 are formed at predetermined intervals in the circumferential direction. The water spray nozzle 15 is supported by a holder 26 attached to the back side of the door 12.
The fire hose 14 is pulled out by holding it and running. 27 is a fire hose 14 when stored
It is a support arm that prevents it from unraveling. e Function of the invention Next, the function of the fire hydrant valve of the invention will be explained. 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 aligned with the shaft 1.
3, and the follow valve 16 changes direction to follow the extending direction of the fire hose 14. Then, when the fire hose 14 is stretched out and pulled, the inner pipe 20 connected to the base of the fire hose 14 slides, and the inside of the outer pipe 18 and the inner pipe 20 are moved.
The inside communicates and the valve is opened. At this time, as the inner tube 20 slides, the hole 25 first reaches the packing groove 19a, and the air in the packing groove 19a is released into the inner tube 20. With this, the inner pipe 20
Even if the tip of the seal 24 separates from the seal 24, the seal 24 remains in the seal groove 19a without separating from the seal groove 19a. Then,
When the inner tube 20 slides further and the hole 25 reaches the flow path of the fitting part 21 of the outer tube 18, the air in the fitting part 21 is removed from the hole 25. And finally, inner tube 2
The tip of 0 communicates with the inside of the fitting part 21 of the outer tube 18,
The valve opens. 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 this case, if the fire point is nearby and two fire hoses are not required, disconnect the connection and connect the front hose base to the follow valve 16.
What is necessary is just to connect directly to the inner tube 20 of. f Other Embodiments FIG. 6 shows another embodiment of the present invention, in which the same parts as in FIG. 3 are given the same reference numerals and their explanations are omitted. In this case, an axial groove 28 is formed in place of the hole 25 as an air vent passage formed in the inner tube 20, and as the inner tube 20 slides, the groove 28
reaches the packing groove 19a and removes air from the packing groove 19a. g Test Example A pull-out test was conducted using follow-up valves A and B, each of which had an air vent hole or groove formed in its inner tube, and follow-up valve C, which had no air vent hole. Follow valve A...8 holes of 3 mmφ were drilled at 6 mm from the end of the inner tube. Follow valve B...12 grooves with a width of 2 mm were formed from the end of the inner tube to a position 7 mm away. Follow valve C...No air vent hole. For each of the above-mentioned follow valves A, B, and C, a pull-out test was conducted 10 times each at water pressures of 4, 7, and 10 kg/cm ² using a bag packing and a C ring. Before each test, remove the follow valve from the main valve, turn off the water completely, and use a 3 m long hose with metal fittings to connect the follow valve to the drawer.
I grabbed it at 15cm and pulled it sharply.

【table】

【table】

[Table] h Effects of the invention As described above, according to the fire hydrant valve of the invention, an air vent passage is formed at the tip of the inner pipe that communicates the inside and outside of the inner pipe, so that when the inner pipe slides, Since the air inside the outer tube can be released into the inner tube when the inner tube is slid a specified width, the valve can be easily opened by a single firefighter, and the valve can be easily opened by a single firefighter. Separation of the water material can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional fire hydrant valve, FIG. 2 is a perspective view showing a front-loading fire hydrant box, and FIGS. 3 and 5 are fire hydrant valves according to an embodiment of the present invention. FIG. 4 is a cross-sectional view showing an air vent passage of the inner pipe, and FIG. 6 is a partial cross-sectional view showing a fire hydrant valve according to another embodiment of the present invention. 10...Fire hydrant box, 14...Fire hose, 15...Water nozzle, 16...Fire hydrant valve, 18...Outer pipe, 19...Cylinder part, 19a...
Packing groove, 20...inner pipe, 24...packing,
25...hole, 28...groove.

Claims (1)

[Claims for Utility Model Registration] (1) An L-shaped outer tube that is connected to a water supply port through one open end and has a flow path orthogonal to the outer tube, and a coaxial An inner tube is fitted on the top of the inner tube to block the flow path, and when the inner tube is pulled out to a predetermined position, the inner tube on the water supply side of the outer tube and the inner tube are attached to the wall surface of the distal end of the inner tube. A fire hydrant valve characterized by forming an air vent passage communicating the inside of the fire hydrant. (2) A practical use characterized in that a water-stopping material is arranged on the inner surface of the outer pipe on which the inner pipe slides, and the air vent passage is formed so as to communicate with the inside of the outer pipe beyond the water-stopping material. A fire hydrant valve as set forth in claim (1) of patent registration.