JP2000035155A - Underground type fire hydrant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce height dimensions of a valve device by carrying out opening and closing work of a valve element in the horizontal direction. SOLUTION: A water passing passage 15 communicating with a conduit is provided in a valve box 12, a fire hydrant port 14 communicated to the water passing passage 15 is provided on an upper part of the valve box 12, a valve element 16 to open and close the water passing passage 15 is arranged in the valve chest 12, the valve element 16 is formed in a disc shape having an axis of rotation in parallel with a shaft center of the water passing passage, an opening hole 16a to open the water passing passage 15 is provided on the valve element 16, a gear part is formed on a peripheral edge part of the valve body 16, a small gear 21 to be engaged with the gear part is arranged free to rotate and a cap 23 is connected to the small gear 21 through an input shaft 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground fire hydrant connected to a pipeline such as a water supply system.

[0002]

2. Description of the Related Art A conventional fire hydrant of this type is shown in FIG. 6 as an example. The fire hydrant 1 is installed in a manhole, and is provided in a pipeline (not shown) for water supply and the like.
A port 3 is formed in the lower part of the valve box 2 connected to the valve box 2, and a fire hydrant 2 a is provided on the side of the valve box 2. Inside the valve box 2,
A valve body 4 that opens and closes the port 3 is arranged, and a valve stem 5 that drives the valve body 4 to open and close is supported rotatably and slidably by a valve box cover 6 and screwed into the valve stem 5. Nut 7 to be removed from valve box 2
We support in. The valve box lid 6 is provided with a fire hydrant port 8 at a position facing the fire hydrant section 2a, and a protective cover 10 is mounted on a fire hydrant port 9 provided in the fire hydrant port 8.

With the above configuration, when using the fire hydrant 1, the protective cover 10 is removed, a fire hose is connected to the fire hydrant port 9, the valve rod 5 is driven to rotate, and the valve body 4 is lifted upward and opened. .

[0004]

In recent years, however, it has been required to bury a pipe line shallowly in order to reduce the burying cost, and to reduce the height of the valve device. Has become. However, in the above-mentioned conventional fire hydrant 1, the movable range of the valve body 4 needs to be secured in the upward direction in order to move the valve body 4 up and down to open and close, and the height of the valve device is large. Was the cause.

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide an underground fire hydrant in which the height of a valve device is reduced by opening and closing a valve body in a horizontal direction.

[0006]

In order to solve the above-mentioned problems, an underground fire hydrant of the present invention is provided with a water passage communicating with a pipe in a valve box and communicating with the water passage at an upper portion of the valve box. A fire hydrant port is provided, and a valve body that opens and closes the water passage in the valve box,
The valve body is formed in a disk shape having a rotation axis parallel to the axis of the water passage, and an opening hole for opening the water passage is provided in the valve body, a gear portion is formed on the periphery of the valve body, and the gear portion is formed. A meshing small gear is rotatably arranged, and a cap is connected to the small gear via an input shaft.

With the above construction, the small gear is driven to rotate via the cap and the input shaft when the plug is opened, and the valve element is driven to rotate about the rotation axis by the engagement of the small gear and the gear portion. To correspond to. At the time of closing, the small gear is driven in reverse, the valve body is returned to the closing position, and the water passage is closed.

As described above, the valve body opens and closes between the open position and the close position by rotating around the axis of the rotary shaft, so that the valve body can open and close within the space occupied by the volume of the valve body itself. A separate extra space for opening and closing operation is not required, and the height of the fire hydrant can be reduced.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1 to FIG.
Has a valve box 12 divided above, a lower valve box 12b having a communication port 13 communicating with a pipe (not shown), and an upper valve box 12b.
a has a fire hydrant port 14. The fire hydrant port 14 is screwed and attached to the opening of the upper valve box 12a, and is covered with a protective cover 14a.

A water passage 15 extending from the communication port 13 to the fire hydrant port 14 is provided inside the valve box 12.
The valve body 16 is disposed facing the upper opening of the valve body. Valve body 16
Is a disk-shaped rotating shaft 17 parallel to the axis of the water passage 15.
, Which are rotatably disposed around the axis of the valve body 16, and are formed with seal rings 18 a, 18 b slidably in contact with the upper surface and the lower surface of the valve body 16 at the opening peripheral edges of the upper valve box 12 a and the lower valve box 12 b. 19b.

The valve element 16 has an opening 16a for opening the water passage 15 on one side, and has a gear portion 20 over substantially half of the periphery thereof. The cap 23 is rotatably arranged in the box 12b, and the cap 23 is connected to the small gear 21 via an input shaft 22 supported by the upper valve box 12a. Note that the valve body 16 can be formed in a fan shape as shown in FIG.

The operation of the above configuration will be described. In the closed state shown in FIGS.
6 a is located adjacent to the small gear 21, and seal rings 18 a and 18 b slide on the upper surface of the valve body 16 to stop water.

When opening the cap, the protective cover 14b is removed, a fire hose is connected to the fire cock opening 14, and the cap 23 is opened.
Is opened. Open the cap 23 and open the input shaft 2
When the small gear 21 is driven to rotate via the gear 2, as shown in FIGS. 3 and 4, the valve body 16 is brought into sliding contact with the seal rings 18 a and 18 b by the engagement of the small gear 21 and the gear portion 20, and It rotates around the axis, and the open hole 16a is
5, the water flowing through the water passage 15 flows out of the fire hydrant port 14.

At the time of closing, the valve 16 is returned to the closed position by reversing the driving of the small gear 21 so that the water passage 15 is closed.
Close the cap. The opening position and the closing position of the valve body 16 are recognized by the operator by preventing the rotation of the small gear 21 at both ends of the gear portion 20, but a stopper means such as a pin may be separately provided. .

As described above, since the valve body 16 is opened and closed between the open position and the closed position by rotating about the axis of the rotary shaft 17, it can be opened and closed within the space occupied by the volume of the valve body itself. This makes it possible to reduce the height of the fire hydrant without requiring a separate extra space for opening and closing operations as in the conventional case. Also, the seal rings 18a, 18
Since b is always in sliding contact with the valve body 16, it does not come off in contact with running water, and there is no need to separately prevent the seal rings 18 a and 18 b from coming off. Easy to do. Further, by arranging the seal rings 18a and 18b on both sides of the valve body 16 so as to face each other, reliable sealing performance can be exhibited not only at a high water pressure but also at a low water pressure.

[0016]

As described above, according to the present invention, the valve element opens and closes between the open position and the closed position by rotating around the axis of the rotary shaft, so that the volume of the valve element itself is occupied. The opening and closing operation can be performed in the space, so that an extra extra space for the opening and closing operation is not required, and the height of the fire hydrant can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of an underground fire hydrant showing an embodiment of the present invention.

FIG. 2 is a plan view showing a valve element according to the embodiment.

FIG. 3 is a sectional view of an underground fire hydrant showing an embodiment of the present invention.

FIG. 4 is a plan view showing the valve element according to the embodiment.

FIG. 5 is a plan view showing a valve body according to another embodiment of the present invention.

FIG. 6 is a front view showing a conventional fire hydrant.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Fire hydrant 12 Valve box 12a Lower valve box 12b Upper valve box 13 Communication port 14 Fire hydrant port 15 Water passage 16 Valve body 16a Opening hole 17 Rotation shaft 18a, 18b Seal ring 20 Gear part 21 Small gear 22 Input shaft 23 Cap

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hiroshi Shimada 1-1-1 Nakamiya Oike, Hirakata City, Osaka Prefecture F-term in Kubota Hirakata Factory 3H063 AA05 BB32 DA02 DB39 GG06 GG11 GG12

Claims (1)

[Claims] 1. A water passage communicating with a pipeline is provided in a valve box,
A fire hydrant port communicating with the water passage is provided at the top of the valve box, and a valve body for opening and closing the water passage is arranged in the valve box, and the valve body is formed in a disk shape having a rotation axis parallel to the axis of the water passage. In addition, a valve body is provided with an opening hole for opening a water passage, a gear portion is formed on a peripheral portion of the valve body, a small gear meshing with the gear portion is rotatably arranged, and a cap is provided on the small gear via an input shaft. An underground fire hydrant, characterized by the connection of