JP2000120111A - Underground type fire hydrant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire hydrant which is compact and low in height and has compound functions speedy in operation. SOLUTION: This is an underground type fire hydrant which is attachedly provided to an underground buried city water piping, and its opening and closing is carried out through a ball valve type, and a flow-in port 13 is formed on the lower face of its valve casing 11. A flow-out port 14 having an axial center the same as the flow-in port 13 is formed on the upper face of the valve casing 11, and one or more flow-out ports 15 are further formed on the side of the valve casing. A ball-shaped valve element 12 is rotated around a vertical central axis, and has a straight line- shaped passage 16a to communicate with flow entrances 14, 13 and is branched to form a passage 16b to communicate with a side flow-out port 15. The side flow-out port 15 communicates with a fire cap 17, and an upper face flow-out port 14 communicates with the apparatus of an air valve 50 and a measuring device 40 which are provided in a valve casing 11. Since the flow entrances 14, 13 may always communicate irrespective of the rotation of the valve element 12, a hydraulics inspection carried out through measuring apparatus is possible in the upper flow-out port 14 independently of the existance of utilization of a fire warwe, and an air venting action through the air valve is always possible.

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 attached to a water pipe buried underground and having a combined function other than for fire extinguishing.

[0002]

2. Description of the Related Art A fire hydrant prescribed in JWWA B 103 underground fire hydrant for water supply uses an angle valve type main valve structure, and uses a ball valve or butterfly valve type as a repair valve. It is used only for the purpose.

On the other hand, a water pipe provided with a fire hydrant is appropriately inspected for its flow rate, flow velocity, flow direction, water quality, and the like. The inspection is performed by inserting a measuring sensor (measuring device) or a camera into the pipe. Is For this reason, the above-mentioned fire hydrant only for fire extinguishing cannot be inserted, and the insertion plug is separately provided.

Japanese Patent Laid-Open Publication No. Hei 10-140625 discloses a fire hydrant in which the measuring sensor can be inserted (attached).
An underground fire hydrant with a combined function that can be used for hydraulic inspection other than fire extinguishing, such as water quality inspection and inspection of pipe inner surfaces, is disclosed.
That is, as shown in FIGS. 5 and 6, a stopper cylinder 4 connected to a branch pipe 2 from a water pipe 1 via a ball valve type repair valve 3.
Has a vertical upright path 5 and a branch path 6 thereof. A hydraulic measuring instrument (measurement sensor) 7, an air valve, and the like can be attached to the vertical path 5 and the branch path 6 is opened and closed. An outlet having a fire extinguishing base 9 is formed via a valve 8.

[0005]

As shown in FIG. 5, a conventional general underground fire hydrant has an on-off valve 8 of an angle valve type, and is turned by turning a valve shaft 8a extending upward. The body 8b contacts and separates from the valve seat 8c to open and close the outlet 9.

[0006] Today, water supply pipes are buried in a shallow underground layer, and accordingly, there is a demand for reducing the height of a fire hydrant. In the type in which the valve shaft 8a is raised and lowered, the length of the valve shaft 8a can only be shortened, and the shortening is limited, and cannot be sufficiently satisfied.

In the fire hydrant described in the above-mentioned publication, a branch passage 6 is formed, an on-off valve 8 is provided in the middle of the branch passage 6, and the branch passage 6 is further extended to serve as a connection port (outflow port 9) for a fire hose. , Bulky.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a compact and low height.

[0009]

In order to achieve the above object, according to the present invention, the opening and closing action is first performed by a ball valve type. This is because the ball valve rotates the valve element to change the flow path, so that the valve shaft does not advance or retreat, and is advantageous in reducing the height.

In the present invention, an outflow port having the same axis as the inflow port is formed on the upper surface of the valve box, and the outflow port is communicated straight to the inflow port irrespective of the movement of the valve element. As described above, when the communication is made straight, if a branch pipe from the water pipe is connected to the inflow port straight, it is easy to insert an inspection element such as a measuring instrument or a camera into the water pipe from the outflow port.

The fire extinguishing water port and the outflow port are also directed upward because they can be connected to a hose from above, can be provided with a measuring instrument, and can be checked from above during maintenance or the like. Because it is necessary.

Incidentally, fire hydrants are often installed at equal intervals in the lengthwise direction of a water pipe, so that it is very convenient to use them as hydraulic measurement points.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION As one embodiment of the present invention,
An underground fire hydrant attached to an underground water pipe, with a ball valve opening and closing, forming an inflow port on the lower surface of the valve box, and having the same axial center as the inflow port on the upper surface of the valve box. An outlet is formed, and one or more outlets are further formed on the side surface of the valve box. The ball-shaped valve element is rotated around a central axis in the vertical direction to communicate with the inlet and the outlet on the upper and lower surfaces. It has a straight passage and a passage that branches off from the passage and communicates with the side outlet, the side outlet communicates with an upward fire extinguishing base provided continuously to the valve box, The upper surface outlet may be configured to communicate with devices such as an air valve and a measuring device provided in the valve box.

With this configuration, the valve element rotates around the vertical center axis of the valve element. The rotation of the valve element connects / disconnects the fire extinguishing base (fire extinguishing outlet) with the inflow port.
The top outlet is always in communication with the inlet. For this reason, regardless of the use or non-use of fire-fighting water, hydraulic inspection using a measuring instrument or the like is possible at the top outlet, and if an air valve is connected (connected) to the outlet, air is always vented. The function can be performed, and a large amount of air can be exhausted at the time of filling the water supply pipeline, thereby shortening the pipeline filling time. Further, since the valve element is ball-shaped, the valve element does not remain in the flow path, so that the water discharge resistance at the time of fire extinguishing water decreases, and the amount of water discharge increases.

[0015]

1 and 2 show one embodiment. In this embodiment, a ball-shaped valve element 1 is placed in a valve box 11 forming a plug body (plug body).
2 are inserted, and an inlet 13 and outlets 14 and 15 are formed on the upper and lower surfaces and side surfaces of the valve box 11, respectively. The valve body 12
It is rotatable about the center axis in the vertical direction, and has a linear passage 16a communicating the upper and lower outlets 13 and 14, and a passage 16b branched from the passage 16a and communicating with the side outlet 15. ing. Therefore, the outlet 15 is opened and closed by the rotation of the valve body 12, and the outlet 14 is always in communication with the inlet 13. In the drawing, 12a is a valve seat made of an elastic body or resin, and 17 is a fire extinguisher base.

As shown in FIG. 2, a sector gear 18 is fixed to the valve body 12, and a spur gear 20 provided on a square operating rod 19 meshes with the gear 18. By fitting and turning the plug rod, the two gears 20,
The valve body 12 reciprocates by 90 degrees through the outlet port 18 and the outlet 1
Open and close 5. Arbitrary positions and numbers of outlets 15 can be formed on the side surface of the valve box 11 corresponding to the rotation angle of the valve body 12.

A ball-shaped repair valve 21 is fixed to a lower portion of the valve box 11.
The ball-shaped valve element 23 rotates and opens and closes. The valve 21 is normally opened, and is closed when the faucet valve (the valve body 12 or the like) is repaired, when the hydraulic measuring instrument 40 is attached, or the like. The outlet 14 on the upper surface of the valve box 11 is closed by bolting the cover plate 30 when it is unnecessary to attach a measuring instrument or the like.

This embodiment has the above configuration, and examples of its installation are shown in FIGS. In these, the branch pipe 2 is led from the buried water pipe 1 to the fire extinguishing pit P, and attached to the branch pipe 2. FIG. 3 shows a hydraulic measuring device 40 and FIG. 4 shows an air valve 50 communicating with the upper surface outlet 14, which are always connected to the water pipe 1 via the valve body passage 16a and the branch pipe 2.
, And hydraulic inspection and air bleeding can be performed irrespective of opening and closing of the fire extinguishing port (outflow port) 15. Hydraulic inspection is performed by connecting a monitor (inspection element) for measurement to the valve room or branch pipe 2.
Further, the operation is performed by reaching the water pipe 1. In the figure, reference numeral 60 denotes a pit cover.

[0019]

As described above, the present invention employs a ball valve type, so that it can be compact and low in height, and its opening and closing operations are quick. In addition, a hydraulic measuring device is provided, and has a combined function that has an advantageous point such that the measuring action can be performed regardless of water intake for fire extinguishing.

[Brief description of the drawings]

FIG. 1 is a front view of one embodiment.

FIG. 2 is a cut-away plan view of the embodiment.

FIG. 3 is a cross-sectional view showing one mounting state of the embodiment.

FIG. 4 is a sectional view showing another mounting state of the embodiment.

5A and 5B show a conventional example, in which FIG. 5A is a cutaway front view, and FIG. 5B is a sectional view taken along line XX of FIG.

FIG. 6 is a cross-sectional view showing one mounting state of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Valve box 12 Ball-shaped valve element 13 Inflow port 14 Upper surface outlet 15 Side outlet 16a Straight passage 16b Branch passage 17 Fire extinguishing base 21 Repair valve 40 Hydraulic measuring instrument 50 Air valve

Claims (1)

[Claims] 1. An underground fire hydrant attached to an underground water pipe 1 which is of a ball valve type and has an inflow port 13 formed on the lower surface of a valve box 11 and a valve box 1
An outlet 14 having the same axis as the inlet 13 is formed on one upper surface, and one or more outlets 15 are further formed on the side surface of the valve box 11. The ball-shaped valve body 12 is arranged around a vertical central axis. It has a linear passage 16a which is rotated and communicates with the inlet 13 and the outlet 14 on the upper and lower surfaces.
a passage 16 that branches off from a and communicates with the side outlet 15
b, the side outlet 15 communicates with an upward fire extinguishing base 17 provided continuously with the valve box 11, and the upper surface outlet 14 is provided with an air valve 5 provided in the valve box 11.
0. An underground fire hydrant, which communicates with equipment such as a measuring instrument 40.