JPH022777Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a fire hydrant with an air suction/exhaust device that automatically discharges the air stored in the fire hydrant, and also has an air suction/exhaust device for sucking atmospheric air when draining water in the pipe. Pertains to.

Conventionally, in this type of fire hydrant, an air suction/exhaust device having a float valve is connected to a branch pipe branching from the water supply side of the main valve of the hydrant, and an air suction/exhaust device with a float valve is connected to the inside of the upper end of the hose connection pipe of the fire hydrant through a communication pipe. Although devices in which communication is achieved are known, the present invention is a further improvement.

The gist of the present invention is to connect a fire hydrant valve box to a suction/discharge valve box connected to a water pipe, provide a main valve seat between the two valve boxes, and a main valve that moves up and down with respect to the main valve seat. The valve is equipped with a sub-valve seat having a ventilation hole penetrating vertically, and when the water level rises in the intake/exhaust valve box, it comes into contact with the sub-valve seat and blocks it, and also reduces the amount of air stored in the valve box. A float valve that separates from the auxiliary valve seat and opens the vent hole due to increase in water level (lower water level) is housed in a bottomed float guide. Bearing part above,
A water outlet is provided on each side, and a female screw piece screwed onto the valve stem is removably inserted and fixed into the bearing part, so that the lower part of the valve stem faces the center of the main valve, and when the valve is fully opened, A feature is that the float valve can be pressed against the bottom of the float guide via the main valve by threading the valve stem.

Hereinafter, the present invention will be explained with reference to an embodiment shown in the drawings. In the figure, 1 is a suction/discharge valve box, 2 is a fire hydrant valve box, 3 is a valve stem, 4 is a main valve, 5 is a sub-valve seat, and 6 is a float guide. , 7 is a float valve, and the configuration of each part is as follows.

The intake/discharge valve box 1 is provided with a flange 11 connected to a water pipe (not shown) at the lower part, and a cylindrical synthetic resin float guide 6 is installed inside the valve box 1 with a gap 12 along the inner circumferential surface of the valve box 1. will be established. This float guide 6 has small holes 61 and 62 in the lower part and middle part, and a water passage window 63 in the upper part, and a flange 64 on the outer periphery of the upper end.
The main valve 4 and the float valve 7 are housed in the float guide 6 so as to be movable up and down.

The fire hydrant valve box 2 is connected to the upper flange 13 of the suction/discharge valve box 1 through a flange 21 provided at the lower end, and the flange 6 of the float guide 6 is connected between
4 and O-ring R ₁ , and remove the float guide 6.
A main valve seat 22 is provided at the lower inner periphery of the flange 21, and an O-ring _R2 is provided to bring the upper surface of the main valve 4 into close contact with the hydrant valve box 2.
A bearing part 23 is provided above the main valve 4, and a water discharge port 24 is provided on the side of the upper part of the main valve 4.A female screw piece 31 screwed onto the valve stem 3 is removably inserted and fixed into the bearing part 23, and the lower part of the valve stem is fixed. 32 is opposed to the center of the main valve 4, the space between the female screw piece 31, the bearing part 23 and the valve stem 3 is made airtight by O-rings R ₃ and R ₄ , and the water outlet 24 is provided with a water outlet 25 .

The main valve 4 is provided with a boss 41 at the center, a sleeve 42 that slides on the inner periphery of the float guide 6, and a hole 43 that communicates with the inside and outside of the sleeve. A valve seat 5 and a pressing tool 5a for the valve seat are provided.

The sub-valve seat 5 is made of synthetic rubber and has the shape of an inverted truncated cone, and has a vent hole 51 that penetrates vertically in the center, and the sub-valve seat 5 is less than half the hole provided in the boss 41 of the main valve. The lower end protrudes below the boss 41 to facilitate contact and separation with the float valve 7. The pressing tool 5a is inserted into the upper part of the hole of the boss 41 and brought into contact with the upper surface of the sub-valve seat 5, and the air vent hole 51 is located in the center.
A vent hole 52 connected to the vent hole 52 and a concave portion 53 that is open at the top are provided above the vent hole 52, and air can be vented through a gap 54 between the upper surface of the concave portion 53 and the lower end portion 32 of the valve stem 3.

Due to the above configuration, during the initial water flow through the water pipe, the main valve 4 and the float valve 7 are located below the float guide 6, and a large amount of air is released in order to completely open the window 63 of the float guide 6 and the main valve seat 22. is discharged and the initial water passage work is carried out quickly.

Furthermore, when the initial flow of water through the water pipe is completed and the intake/discharge valve box 1 connected to the upper part of the water pipe is filled with water, the main valve 4 and the float valve 7 are connected and floated, and the main valve 4 is connected to the main valve seat 2.
2 to prevent water from flowing from the intake/discharge valve box 1 to the fire hydrant valve box 2, and the float valve 7 is in close contact with the lower end surface of the sub-valve seat 5 to block the air vent hole 51 and prevent water from leaking from the hole. .

On the other hand, after the initial water flow is completed, it separates and rises from the water flow,
closed by the main valve 4 and the float valve 7;
When the compressed air accumulated in the upper part of the intake/discharge valve box 1 reaches a certain amount, the float valve 7 moves away from the sub-valve seat 5 due to the decrease in buoyancy, and the air vent hole 51 opens, and the air vent hole 52 of the pressing tool 5a is opened from the same hole. , the stored air is discharged into the fire hydrant valve box 2 through the recess 53 and the gap 54, so the stored air is automatically released. When the air in the intake/discharge valve box 1 is discharged in this manner, the water level in the valve box 1 rises, the float valve 7 floats up, and the sub-valve seat vent hole 51 is closed.

When using a fire hydrant, use the cap 2 of the water outlet 24.
When a hose is connected to 5 and the valve stem 3 is screwed in, the main valve 4 is inserted and pushed away from the main valve seat 22. The water passes through the main valve seat 22 and is discharged from the water discharge port 24.

In this case, the float valve 7 is
When the float valve 7 is pushed and the float valve 7 comes into contact with the bottom of the float guide 6, the valve becomes fully open, and in this state, the float valve 7 does not vibrate or make any abnormal noise.

In addition, when draining water in the pipe, the pressure inside the intake/discharge valve box 1 becomes lower than atmospheric pressure, so the main valve 4 is separated from the main valve seat 22 while still connected to the float valve 7, and a large amount of water is removed from the fire hydrant valve box 2. Since the air is sucked in, the water in the water pipe can be drained quickly.

As described above, the present invention has a fire hydrant valve box connected to the intake/discharge valve box, so there is no need to connect the two valve boxes with a connecting pipe, making the structure simple and compact. A valve is provided to stop the water supply from the intake/discharge valve box to the fire hydrant valve box, and the main valve is equipped with a sub-valve seat with a ventilation hole, and a float valve is provided below the sub-valve seat so as to be able to move up and down, so that the air accumulated below the main valve can be removed. When the float valve is separated from the sub-valve seat and vents air from the vent hole and drains water from the water pipe, the outside air is sucked in from the main valve, so it operates effectively as an intake/exhaust device, and is of great practical benefit. Moreover, when the valve is fully open, the float valve can be pressed against the bottom of the float guide via the main valve by screwing the valve stem, so when the valve is fully open, the float valve is held down by the main valve and the bottom of the float guide, causing vibration. It does not cause any noise or noise.

Furthermore, since the valve stem is screwed into a female threaded piece that is removably inserted and fixed into the bearing section at the top of the fire hydrant valve box, the suction and discharge valve box is filled with water, and the main valve and float valve float up to the main valve seat and If the auxiliary valve seat is closed, the valve stem can be removed together with the female screw piece without worrying about water leakage, making maintenance of the valve stem easy.

Furthermore, in cities other than some areas with heavy snowfall, construction work is currently underway to replace above-ground fire hydrants with underground fire hydrants to avoid hindrances to traffic. The method involves installing a valve box and attaching a fire hydrant, but this increases costs and has a large impact on the lives of citizens as it requires traffic to be blocked off.Furthermore, the longer the construction period, the less water used for fire extinguishing during that time. However, according to the structure of the fire hydrant of the present invention, it can be installed using an existing air valve, and the above-mentioned disadvantage does not occur. That is, since the existing air valve already has a valve box chamber corresponding to the intake/discharge valve box equipped with the main valve, float valve, etc. of the present invention, a part of the upper part of the existing air valve is removed and the fire hydrant of the present invention is installed. By attaching the part to the valve box chamber of the air valve, the installation of the fire hydrant can be completed in a few minutes. Therefore, since most of the existing parts can be used as they are, there is no waste and the cost is low.

[Brief explanation of the drawing]

The figure is a longitudinal sectional front view showing an embodiment of the present invention. 1 is the intake and exhaust valve box, 2 is the fire hydrant valve box, 3 is the valve stem, 4
5 is a main valve, 5 is a sub-valve seat, 6 is a float guide, and 7 is a float valve.

Claims (1)

[Scope of utility model registration request] A fire hydrant valve box is connected to the intake/discharge valve box connected to the water pipe, and a main valve seat and a main valve that move up and down relative to the valve box are installed between the two valve boxes. A sub-valve seat with a ventilation hole is provided in the suction/discharge valve box, and as the water level rises in the box, it comes in contact with the sub-valve seat and closes it, and as the amount of air stored in the valve box increases, air leaks from the sub-valve seat. A float valve that allows ventilation by opening a separate ventilation hole is housed in a bottomed float guide.
Further, in the upper part of the fire hydrant valve box, a bearing part is provided above the main valve and a water outlet is provided on the side, and a female screw piece screwed onto the valve stem is removably inserted and fixed into the bearing part. An air intake/discharge device characterized in that the lower part of the valve stem faces the center of the main valve, and when the valve is fully opened, the float valve can be pressed against the bottom of the float guide via the main valve by screwing the valve stem. Fire hydrant with device.