JPH0490768A - Delayed type automatic valve for fire hydrant - Google Patents

Abstract

PURPOSE:To enable one person to extinguish fire by mounting a delayed type automatic valve to a fire hydrant valve in a fire hydrant box. CONSTITUTION:An automatic valve AV is provided with a valve seat 2b opened and closed by a main valve 3 between a primary side opening 2a and secondary side opening 4a. When the automatic valve AV is opened, pressurized water flowing into the primary opening 2a operates a diaphragm 15 of a pilot valve 18 and flows into a volume tank 11 from a third opening 22 of a branch chamber through a pin hole 16 of the diaphragm 1.5 and an orifice so that air in the volume tank 11 escapes from an exhaust valve 14. When the volume tank is further filled with the pressurized water, a first float 13 in the exhaust valve 14 is floated up to close the exhaust valve 14. The pressurized water flows from the volume tank 11 into a second opening to push up a second float 24, and modes to a first opening 26 of the pilot valve 18 to stop the inflow of the pressurized water into the secondary opening 4a of the automatic valve AV. A piston 9, stem 5 and the main valve 3 are lifted by a difference between the pressure receiving areas of the main valve 5 and piston 9 to open the valve seat 2b so that the pressurized water flows into the secondary side of the automatic valve AV and is jetted from a nozzle of a fire hose.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention attaches a delay-type automatic valve to a fire hydrant valve, so that when a fire occurs, one person can rush to the fire scene with a nozzle, and the fire hydrant valve of the fire hydrant can be automatically operated. This invention relates to a delay-type automatic valve for fire hydrants that can be operated to extinguish the initial fire within a short period of time.

[Prior Art] In a conventional fire hydrant device, a fire hydrant valve of a water supply pipe is provided in a fire hydrant box, and a hose with a nozzle is arranged in a folded manner. When a fire broke out, one person would rush to the location of the fire with a nozzle in hand, and the other person would wait until the hose was fully extended, open the fire hydrant valve, and begin water supply. Therefore, multiple people are required to operate the fire hydrant, and initial fire extinguishing in an emergency often takes time and is inconvenient. [Problems to be Solved by the Invention] The first purpose of the present invention is For existing fire hydrants, a delayed automatic valve is attached to the fire hydrant valve in the fire hydrant box, and when a fire breaks out, the automatic valve is automatically activated when the fire hydrant valve is opened, the nozzle is grabbed, and the person rushes to the location of the fire. We will start supplying water, so
- The purpose is to allow people to easily extinguish fires.

A second object of the present invention is to automatically start supplying water to the hose after a certain period of time has passed since pressure water flows into the primary side of the automatic valve. Therefore, since the interior of the hose is almost empty when the hose is extended, the purpose of the present invention is to reduce the traction force needed to pull out the hose.

[Means for Solving the Problems] The present invention provides an automatic valve AV including a primary opening 2a and a secondary opening 4a provided via a valve seat 2b that is opened and closed by a main valve 3; A piston 9 having an outer diameter larger than the inner diameter of the valve seat 2b attached to the stem 5 of the main valve 3 that opens and closes the valve seat 2b of the valve AV, and an automatic valve in which the piston 9 is housed so as to reciprocate. The first float 1 is connected to the lower chamber of the cylinder 2e of the AV.
3, and a volume tank attached to the lower chamber of the cylinder 2e, connected to the primary side opening 2a of the automatic valve AV, and operated by pressure water on the primary side. Drill the small hole 16a and insert the pilot 1
8 attached to the diaphragm 16, and the diaphragm 1
A pilot valve PV equipped with an orifice 17 that is opened and closed by a pilot 18 of the pilot valve 6, a branch chamber 2 that communicates with the orifice 17 of the pilot valve PV, and a branch chamber 2 that automatically transmits the pressure water that has flowed into the branch chamber 2. The first opening 26 discharges into the secondary opening 4a of the valve AV, and the second opening 26 is connected to the lower chamber of the cylinder 2e of the automatic valve AV.
It comprises a second opening 23 provided with a float 24 and a third opening 22 connected to the volume tank 11, and by opening the fire hydrant valve, pressure water is supplied to the primary opening 2a of the automatic valve AV. When the pressure water that has flowed into reaches the exhaust valve 14, the flow from the third opening 22 of the branch chamber 2 to the volume tank 11 stops, and the flow only flows to the secondary side chamber 4a, and the second float 24 floats up and branches. The first opening 26 of the second chamber is shut off, and the pressure in the lower chamber of the piston 9 increases.
The pressure is set to be the same as the primary side pressure, and due to the difference in pressure receiving area between the main valve 3 and the piston 9, the upward force becomes large and the main valve 3 is moved upward via the stem 5 from the primary side to the secondary side of the main valve. That is, this is an automatic delay valve for a fire hydrant, which is characterized in that it discharges pressurized water to a hose nozzle.

[Function] As described above, in the present invention, when the automatic valve of the fire hydrant is opened and the user rushes to the fire level 1 with the nozzle in hand, the pressure water flowing into the primary opening of the automatic valve activates the diaphragm of the pilot valve. At the same time, the pressure water that has passed through the small hole in the diaphragm flows into the volume tank from the third opening of the branching chamber through the orifice, and the air in the volume tank is released from the exhaust valve, and when the volume tank is further filled with pressure water. The first float of the exhaust valve floats up and closes the exhaust valve. Then, the pressure water in the volume tank flows into the second opening of the pilot valve where the second float is provided, pushes up the second float, moves to the first opening of the pilot valve, and applies pressure to the secondary opening of the automatic valve. Stop the inflow of water. As mentioned above (the piston diameter is larger than the valve seat diameter of the main valve, and due to the difference in pressure receiving area, the piston, stem, and main valve rise due to the water pressure applied to the lower surface of the automatic valve piston and open the valve seat, so the automatic valve Pressure water flows from the primary side to the secondary side (extinguisher hose side) and is discharged from the nozzle of the extinguisher hose.

As described above, the time from opening the fire hydrant valve to opening the main valve of the automatic valve can be changed depending on the volume of the volume tank and the annular gap area of the orifice of the pilot valve. In addition, in order to prevent limescale etc. from adhering to the annular gap of the orifice, a moon-shaped part is formed on the front of the large diameter part of the pilot as shown in Fig. 4 to cut off water scale etc. adhering to the annular gap of the orifice. , the annular gap can be maintained at a predetermined area.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

Figure 1 is an explanatory diagram of each part of the delayed automatic valve of the present invention, Figure 2 is an explanatory diagram of the flow of fire extinguishing water in the waterway during the initial operation, and Figure 3 is the hose side (secondary side) after the main valve opens. It is an explanatory view of a state where water is sprayed on. In the figure, 1 is the primary opening 2 of the body 2.
The fire hydrant valve connection port 3 is a female matino coupling fitting of the automatic valve AV attached to a, and 3 is a main valve, which is placed on the valve seat 2b on the primary side of the body. 4 is a male Machino coupling fitting for hose connection attached to the secondary side opening 2a of the body 2, 5 is the stem of the main valve 3 that loosely passes through the valve seat 2b of the secondary side opening 4a, and 6 is the secondary An O-ring 7 provided on the partition wall 2d between the side opening 4a and the cylinder 2e keeps the stem 5 pressed downward between the partition wall 2d and the piston 9 attached to the lower end of the stem 5, so that the main valve 3 is always connected. The outer diameter d2 of the piston 9 is larger than the inner diameter d1 of the valve seat 2 of the main valve 3. 2e is partition wall 2
It is a cylinder provided below d, and fits into the piston 9 of the stem 5 so as to slide therein. 8 is an O-ring fitted to the piston 9, 11 is a volume tank connected to the cylinder 2e, 12 is a drain valve provided at the lower end of the volume tank 11, and 13 is opened at the opening of the lower chamber of the cylinder 2e. A first float accommodated in the exhaust valve 14, 15 the body of the pilot valve PV, 16 a diaphragm attached to the orifice 17 of the body 15 of the pilot valve, 1
Reference numeral 8 denotes a pilot, one end of which is tied to the diaphragm 16. A second spring 19 is pressed between the pilot and a cap 20 attached to the body 15, so that the diaphragm 16 is constantly moved to the left (the first ) with the second spring 19. 21 is body 15 and cap 20
22 is the first joint provided on the lower part of the body 15, 23 is the second joint screwed on the lower side of the cap 20, 24 is the lower chamber E of the cylinder 2e and the branch chamber 270-1 opens and closes the hole 23a side of the second joint 23 of the pipe A that communicates with the second lower chamber. Further, the bypass hole 22a communicating with the branch chamber 2 of the body 15 is continuously connected to the secondary side opening 4a of the body 2 through a pipe 26. Reference numeral 27 indicates a pipe that communicates the primary side opening 2a of the body with one side chamber i of the diaphragm 16 of the pilot body 15.

The diaphragm 16 has a plurality of small holes 16a, and the pressure water that flows from the primary side opening 2a of the body 2 through the repair pipe 27 into the primary chamber 1 of the diaphragm 16 is once dammed by the diaphragm 41.6. It is stopped and introduced into the other side chamber opening of the diaphragm 16 through the hole 16a.

As shown in the enlarged views of the main parts in FIGS. 4 and 5, the outer diameter d3 of the pilot 18 of the pilot valve PV is
7, the pilot 18 is smaller than the inner diameter d4 of the hole 17a of
has an outer diameter d5 that is inserted into the hole 17a of the orifice 17.
A large-diameter portion 18a is provided for cutting and removing limescale, dirt, etc., and a blade-shaped portion 18b is provided at the tip of the large-diameter portion 18a for cutting limescale, dirt, and the like. Further, a guide protrusion 1 is provided in front of the large diameter portion 18a with a space between the large diameter portion 18a and the large diameter portion 18a.
8c and a catch 18d are provided, and when the catch 18d is pressed by the spring 19 and the catch 18d is brought into contact with the outer surface of the orifice 17 (FIG. 4), the guide protrusion 18c is attached to the orifice 17. The diaphragm 16 is reversed by the primary side water pressure of the automatic valve AV, and the pilot 1 is disposed in the hole 17a.
8 to the right as shown in FIG. 5, the large diameter portion 18a
The scale and dirt adhering to the periphery of the hole 17a on the inner side of the orifice are cut and removed by the blade-shaped portion 18b of the hole 17.
a and is discharged to the outside of the orifice 17. Since the large-diameter portion 18a of the pilot 18 protrudes to the right outside of the orifice as shown in FIG. Gap 2 between the inner wall of the rib body 15 and the outer wall of the cap 20 through the hole in the cap 20
The branch chamber 2 is reached from the hole C of the body 15 through the hole 0a.

DESCRIPTION OF OPERATION In FIG. 2, the hydrant valve connection port 1 is coupled to a hydrant valve (not shown). Next, when the fire hydrant valve is opened, pressure water flows into the primary side of the automatic valve AV and flows from the first connection port A through the pipe 27 into the chamber A of the pilot valve PV. through the small hole 16a of the diaphragm 16, and the annular gap 20a between the orifice 17 and the pilot 18 to the pilot valve PV.
It flows into the branch chamber 2 through the hole 8 of the body 15.

The pressure water that has flowed into the branch chamber 2 is transferred to the pipe 26 of the second connection port B of the automatic valve AV and the third connection port C of the volume tank 11.
The water branches and flows into a passage 28. A small amount of water flowing into the secondary opening 4a of the automatic valve flows into the extinguishing hose, and water flowing into the volume tank 11 flows into the volume tank 1.
It is stored in 1. When the volume tank 11 becomes full of water, the float 24 floats up and blocks the hole of the pipe 26 of the second connecting hole B.

From the first joint 22, through the pipe 28, and from the third connection port 〇 to the volume tank 111. :The inflowing fluid is accumulated in the piston chamber water. The air in the piston chamber water moves upward as the volume tank 11 is filled with water, pushes up the first float 13 from the opening, and is discharged to the outside from the exhaust port of the exhaust valve I4.

As described above, when air is exhausted from the exhaust valve 14 and the lower chamber E is filled with water, the float 13 floats up and closes the exhaust valve 14. And then. The pressure of the water in the volume tank 11 increases, flows into the second joint 23 via the pipe 29, and becomes equal to the primary side pressure. Since the piston diameter D2 is larger than the inner diameter D1 of the valve seat of the main valve 3 of the automatic valve AV, the upward force becomes large due to the difference in pressure receiving area, causing the main valve 3 to move upward through the stem 5. 3, and it is fully opened as shown in FIG.

As mentioned above, the time from opening the fire hydrant valve to opening the automatic valve depends on the size of the volume tank 11, that is, the volume of the lower chamber of the cylinder 2e, and the annular shape of the orifice 17 and pilot 18. It can be changed depending on the gap area.

In addition, in order to prevent water scale, dirt, etc. from adhering to the inner and outer edges of the annular gap 17a, the lower part of the pilot 18 is formed to have a blade-shaped portion 18b as shown in Fig. 4, so that the adhesion will occur at the same time as the fire extinguishing operation starts. The annular gap 17a can be maintained at a predetermined area by cutting off limescale and the like.

When the fire extinguishing work is finished, close the primary side valve of automatic valve AV, open drain valve I2, and drain the pressure water in the lower chamber water of piston chamber 2e, and the main valve 3 will be lowered, and the primary side valve seat 2b of the body will be lowered. Close it and return to the state before activation.

FIG. 6 shows another embodiment of the present invention, in which a hose 52 with a nozzle 51 attached to the tip is folded and accommodated in a fire hydrant box 50.
The fire hydrant valve 53 is opened in parallel with the time taken to remove the water.
This is a case where the fire hydrant valve opening member 54 is engaged with the nozzle 51.

(Effects) As described above, when a person opens the fire hydrant valve and rushes to the fire location with the nozzle of the fire hose, the pressure water that flows into the primary side of the automatic valve damages the diaphragm of the pilot valve. By operating the diaphragm, the orifice is opened by a pilot and the pressure water flowing out from the orifice can flow into the branch chamber.The pressure water flowing into the branch chamber is set to have the required volume. The volume tank is gradually filled and the air inside the volume tank is allowed to escape through the exhaust valve.After a considerable amount of time has passed, the volume tank is filled with water and the exhaust port of the exhaust valve is closed.
This time, the water in the volume tank becomes equal to the water pressure at the primary side opening of the automatic valve, reaches the second joint of the branch chamber, pushes up the second float, and closes the waterway leading to the secondary side chamber of the automatic valve. Due to the difference in diameter between the main valve and the stem, the main valve moves up together with the stem and piston to open the valve seat and communicate the primary and secondary sides of the automatic valve. Therefore, the pressure water that has passed through the fire hydrant valve can be automatically supplied to the fire hose nozzle to extinguish the fire. In addition, according to the present invention, since the water supply to the hose is automatically started after a certain period of time has passed after pressure water flows into the primary side, the hose is almost empty when the hose is extended. This has the effect that only a small tensile force is required for pulling out.

[Brief explanation of the drawing]

Fig. 1 is a detailed explanatory diagram of the present invention, Fig. 2 is an explanatory diagram of the flow of pressure water through the water channel in the initial operation of the present invention, and Fig. 3 is an explanatory diagram of the main valve opening and water being sent to the hose side. , FIG. 4 and FIG. 5 are enlarged explanatory views of the orifice portion of the pilot valve, and FIG. 6 is an explanatory view of another embodiment of the present invention. V V a b e: Automatic valve: Pilot secondary primary opening: Valve seat Niji cylinder: Main valve 4a: Secondary opening 5: Stem 9: Piston 11: Volume tank 13: First float 14: Exhaust valve I5 : Diaphragm 16: Small hole 17: Orifice 18; Pilot 22: Third opening 24: Second float 26: First opening 2 Two-branch chamber Utility model registration applicant Akimoto Valve Kogyo Co., Ltd. Agent Person figure procedure amendment Book 92 Otohira component year month 6th

Claims (1)

[Claims] (1) Automatic valve AV equipped with a primary opening 2a and a secondary opening 4a provided via a valve seat 2b that is opened and closed by the main valve 3
and a piston 9 having an outer diameter larger than the inner diameter of the valve seat 2b attached to the stem 5 of the main valve 3 that opens and closes the valve seat 2b of the automatic valve AV, and the piston 9 is housed so as to reciprocate. The first float 1 is connected to the lower chamber of the cylinder 2e of the automatic valve AV.
3 and a volume tank 1 attached to the lower chamber of the cylinder 2e.
1, and is connected to the primary side opening 2a of the automatic valve AV, and has a small hole 16a operated by pressure water on the primary side, and has a pilot 1
8 attached to the diaphragm 16, and the diaphragm 1
A pilot valve PV equipped with an orifice 17 that is opened and closed by a pilot 18 of the pilot valve PV, a branch chamber D that communicates with the orifice 17 of the pilot valve PV, and a branch chamber D that automatically flows the pressure water that has flowed into the branch chamber D into the branch chamber D. The first opening 26 discharges into the secondary opening 4a of the valve AV, and the second opening 26 is connected to the lower chamber of the cylinder 2e of the automatic valve AV.
It comprises a second opening 23 provided with a float 24 and a third opening 22 connected to the volume tank 11, and by opening the fire hydrant valve, pressure water is supplied to the primary opening 2a of the automatic valve AV. When the pressure water that has flowed into reaches the exhaust valve 14, the flow from the third opening 22 of the branching chamber 2 to the volume tank 11 stops, and only flows to the secondary side chamber 4a, and the second float 24 floats up and branches. The first opening 26 of the chamber 2 is blocked, and the pressure in the lower chamber of the piston 9 increases.
The pressure is set to be the same as the primary side pressure, and due to the difference in pressure receiving area between the main valve 3 and the piston 9, the upward force becomes large and the main valve 3 is moved upward via the stem 5 from the primary side to the secondary side of the main valve. That is, an automatic delay valve for a fire hydrant, characterized in that it discharges pressure water to a hose nozzle.