JP2000064367A - Underground type fire hydrant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower height, and to increase operating speed of an underground type fire hydrant. SOLUTION: The underground type fire hydrant is annexed to an underground-buried water service piping, and opened and closed in a ball valve type, an inflow port 12 is formed to the underside of the valve casing 11 of the fire hydrant, a valve spindle 13 is placed in the same axial center as the inflow port 12 and projected from the top face of the valve casing 11, and can be operated by a cap type rotating bar, and an outflow port is formed to the side section of the top face of the valve casing 11 and a mouth piece 18 for fire extinguishing is installed. Since a flow path is changed by turning a valve body 14 in a ball valve, the valve spindle 13 is not forwarded and retreated, and height can be lowered. Since the fire hydrant is opened and closed by revolution at 90 deg., 180 deg., etc., of the valve spindle 13, the operating speed of the fire hydrant is also increased. An air valve 17 is mounted on another side section of the top face of the valve casing 11, and the air valve 17 and the outflow port can communicate selectively with the inflow port 12 by the ball valve.

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 underground water pipe.

[0002]

2. Description of the Related Art A conventional general underground fire hydrant is shown in FIG.
9 is an angle valve type in which an inflow port 2 is formed on the lower surface of a valve box 1 forming a stopper body, and a valve body 4 is brought into contact with and separated from a valve seat 5 by rotating a valve shaft 3 extending upward. , Open / close the outlet (fire hydrant) 6. FIG. 8 shows a single-mouth type, and FIG. 9 shows a double-mouth type.

Further, as shown in FIG. 10, there is also one in which an air valve 7 is provided so as to branch from the inflow port 2, and further, FIG.
As shown in FIG. 1, there is also a ball valve type in which the valve shaft 3 is turned sideways and the valve rod 4 is rotated by the operating rod (cap shaft) 3 ′ via the worm gear mechanism 8 to open and close.

[0004]

Nowadays, water pipes are buried underground in shallow layers, and there is a demand for lowering the height of fire hydrants. In order to meet this demand, the type of raising and lowering the valve shaft 3 shown in FIGS. 8 to 10 has no choice but to shorten the length, and there is a limit to the shortening of the length, which cannot be sufficiently satisfied.

Since the one shown in FIGS. 8 to 10 is an external screw type, it is necessary to rotate the valve shaft 3 a lot to open and close it, and the one shown in FIG. 11 has a worm gear mechanism 8 interposed therebetween. Similarly, in order to open and close, it is necessary to rotate the operating rod 3'a lot.

Further, since the one shown in FIG. 11 has the worm gear mechanism 8 and is large in size and can be lightly operated, the operation rod 3'can be rotated even if the valve body 4 cannot rotate due to some circumstances. Therefore, there is a risk of destroying the gear mechanism 8. Further, when a person rests on the operating rod 3 ', the gear mechanism 8 has a cantilever structure, which may cause damage.

In view of the above situation, an object of the present invention is to make it possible to reduce the height and reduce the operating rotational speed of the valve shaft.

[0008]

In order to achieve the above-mentioned object, the present invention first decides to perform the opening / closing operation 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 move forward and backward, which is advantageous for reducing the height.

Next, the valve shaft was provided in the up-down direction, and the outflow port serving as the fire extinguishing water port was formed next to it. This is because the valve shaft must be operated from above, and it is also necessary to connect the hose to the fire extinguishing water port from above as well.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION As one embodiment of the above invention,
An underground fire hydrant attached to a underground water pipe, the opening and closing of which is a ball valve type, and an inflow port is formed on the lower surface of the valve box, and the valve shaft has the same axial center as that of the inflow port. It is possible to employ a configuration in which the cap is protruded to the upper surface of the valve box and can be operated by a cap-type stopper rod, and the outflow port is formed on a side portion of the upper surface of the valve box and provided with a fire extinguisher.

With this arrangement, the flowing water from the outlet is
It bends in an L shape and flows out, and there is little risk of water splashing from the outlet when opened slightly for inspection. Incidentally, in the case of the one shown in FIG. 11, when it is slightly opened, water flows straight out upward and scatters.

In this structure, an air valve may be provided on the upper side portion of the valve box so that the air valve and the outflow port can be selectively communicated with the inflow port by the ball valve.

According to this structure, the air valve is normally connected to the water supply pipe to bleed the air, and the pipe is connected to the outlet when the fire is extinguished. At this time, if the piping, the air valve, and the outlet can be shut off at the same time, the air valve or the like can be repaired. Incidentally, in the conventional fire hydrant with an air valve shown in FIG. 10, the air valve 7 is repaired by closing the ball-type on-off valve 9 on the way.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment is shown in FIG. 1 and FIG. 2, and this embodiment is of a single mouth type. A ball-shaped valve element 14 is inserted into the valve body 11 that forms the stopper body, and the valve shaft 13 is inserted into the valve body 11
It projects to the upper surface and the upper end is formed into a square pole 13a,
It can be operated with a cap-type stopper rod.

An inflow port 12 is formed on the lower surface of the valve box 11, and the fire hydrant is attached to the branch pipe by screwing a flange 12a around the inflow port 12 to a terminal flange of the branch pipe from the water pipe. The valve seat 15 has a lower surface and both side surfaces opened, and the lower surface communicates with the inflow port 12 and one side surface with an outflow port 16 serving as a fire extinguishing water opening, respectively.
The flow path 14a in the flow path 4 has an inverted L shape and is in communication with or out of communication with the outlet 16 as shown in FIGS. That is, the outlet 16 is opened and closed by rotating the valve shaft 13 by 90 degrees. The other side opening of the valve seat 15 is closed by screwing a closing plug 20 into the valve box 11.

The outlet 16 is provided with a mouthpiece 18, and the mouthpiece 18 is covered with a cap 19. Therefore, as shown in FIG. 2, the outlet 16 is always closed, and when the water is supplied (when the fire is extinguished), the cap 19 is removed, and the hose is connected to the base 18, and then, as shown in FIG. First, the valve body 14 is rotated 90 degrees so that the outflow port 16 communicates with the inflow port 12 to supply water (extinguish a fire).

In the embodiment shown in FIGS. 3 and 4, the outlet 16 is also formed on the other side opening side of the valve seat 15 to form a double mouth type, and the flow passage 14a in the valve body 14 is T-shaped. It is a shape. Therefore, as shown in FIG. 4, both the outlets 16 are normally in non-communication with the inflow port 12, and at the time of water supply, as shown in FIG.

In the embodiment shown in FIGS. 5 and 6, the air valve 17 similar to the conventional one is attached to the other opening of the valve seat 15 in the embodiment shown in FIGS. Therefore, at all times,
As shown in FIG. 5, the inflow port 12 communicates with the air valve 17 to bleed the air in the pipe, and the valve body 14 is opened by 18 when water is supplied.
The outlet 16 is brought into communication with the inlet 12 by turning 0 degrees. In this embodiment, from the state of FIG. 5 or FIG.
When the valve element 14 is rotated by 90 degrees, the air valve 17 and the inflow port 12 are in a fully closed state. Therefore, the repair of the air valve 17 can be performed in this state.

Although each of the above-described embodiments has a double port, as shown in FIG. 7, the valve seat 15 may have four ports. In this case, the outlet 16 or the air valve 1 is provided at each opening.
By connecting 7 to each other, the communication / non-communication modes shown in (a) to (d) can be obtained. That is, it is possible to obtain each mode of a double-mouthed type (FIG. 7A), a single-mouthed type (the same (b)), an air valve (the same (c), and at the time of repair (fully closed, the same (d)). However, it is not limited to four mouths, but can be more than five mouths.

[0020]

As described above, according to the present invention, since the ball valve type is used, the height can be made low and the opening / closing operation thereof is speedy.

[Brief description of drawings]

FIG. 1 is a sectional view showing one working state of one embodiment.

FIG. 2 is a sectional view of another working state of the embodiment.

FIG. 3 is a sectional view showing a working state of another embodiment.

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

FIG. 5 is a sectional view showing another working state of another embodiment.

FIG. 6 is a sectional view showing another working state of the embodiment.

FIG. 7 is an operation diagram of another embodiment.

FIG. 8 is a partially cutaway front view of a conventional example.

FIG. 9 is a partially cutaway front view of a conventional example.

FIG. 10 is a sectional view of a conventional example.

FIG. 11 is a sectional view of a conventional example.

[Explanation of symbols]

1, 11 valve box 2, 12 Inlet 3, 13 valve shaft 4,14 valve body 5,15 valve seat 6, 16 Outlet 7,17 Air valve 12a Mounting flange 13a Square prism for operation 14a Valve body flow path 18 mouthpiece

Claims (2)

[Claims] 1. An underground fire hydrant attached to an underground water pipe, which is opened and closed by a ball valve, forms an inflow port 12 on a lower surface of a valve box 11, and a valve shaft 13 is It projects on the upper surface of the valve box 11 with the same axis as the inflow port 12 and can be operated by a cap-type stopper rod, and the outflow port 16
Is an underground fire hydrant, characterized in that a fire extinguishing cap 18 is formed on the upper side of the valve box 11. 2. An air valve 17 is provided on an upper surface side portion of the valve box 11, and the air valve 17 and the outflow port 16 can be selectively communicated with the inflow port 12 by the ball valve. The underground fire hydrant according to claim 1, which is characterized.