JPH069084Y2 - Straight underground fire hydrant - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a straight underground fire hydrant for a water pipe.

[Prior Art] As shown in Fig. 4, a conventional underground fire hydrant has an inlet 10 connected to a water pipe at the bottom and an opening / closing valve 11 for opening and closing the inlet in the middle. However, an outlet 12 is provided in the upper part through a curved pipe.

By the way, after a considerable number of years have passed since the installation of the water pipe, water leakage due to aging and a decrease in the water flow capacity due to the generation of rust on the inner surface of the pipe occur everywhere. When investigating and inspecting such defects, only the method of cutting off a part of the water pipe after cutting the road can be adopted. Therefore, there are problems such as long water cutoffs, traffic interruptions, expensive construction costs, and red water generation when water is re-passed after the inspection is completed. there were. But,
As the water pipes are gradually deteriorating, it has been earnestly desired to develop an easy pipe inspection method for water utilities.

[Problems to be solved by the invention] Therefore, if it is possible to investigate the above defects of the water pipe by using underground fire hydrants provided at appropriate intervals in the water pipe, it will significantly reduce the time and effort. It is possible to omit. However, with conventional underground fire hydrants, the inlet 1
Since the portion from 0 to the outlet 12 is bent, it is difficult to insert a rod-shaped measuring instrument, and it is practically impossible to inspect and inspect for defects using this fire hydrant.

Therefore, an object of the present invention is to provide a linear underground fire hydrant into which a rod-shaped measuring instrument can be inserted and which enables easy investigation and inspection of defects in the water pipe.

[Means for Solving the Problems]

In order to achieve the above object, an underground fire hydrant according to the present invention includes a lower end inlet connected to a water pipe, an outlet provided opposite to the upper inlet, and a detachable fire hose, A ball valve provided rotatably around a horizontal axis between the inflow port and the outflow port, and a ball valve having a through hole formed in a line with the inflow port and the outflow port in a fully opened position. A horizontal spindle is connected to the outer end of the horizontal shaft via a gear device, and the ball valve can be opened and closed by rotating the spindle.

[Action]

When the spindle is rotated, the rotation direction is changed to the orthogonal direction by the gear device, and the horizontal axis of the ball valve is rotated. Therefore, the ball valve also rotates integrally with the horizontal axis. At the fully opened position of the ball valve, the inflow port, the through hole, and the outflow port are aligned on a straight line. Therefore, if the rod-shaped measuring instrument is inserted from above, the tip of the measuring instrument can be directly inserted into the water pipe. Therefore, even if you do not open and cut the road or cut off part of the water pipe,
You can easily inspect and inspect the pipeline.

〔Example〕

1 and 2 show a first embodiment of an underground fire hydrant according to the present invention, 2 is an inlet connected to a water pipe,
It is formed in a flange shape. Reference numeral 3 is a ball valve rotatably provided about a horizontal shaft 3a, and can be opened / closed by an upright spindle 9. The lower end of the spindle 9 is connected to the horizontal shaft 3 via a gear device 8 such as a bevel gear.
It is connected to the outer end of a and has an engaging portion 9a at the upper end that can engage the water supply opening / closing key. The ball valve 3 has a cylindrical water passage portion 4 and a through hole 3b having substantially the same diameter as the inflow port 2. Reference numeral 5 is an outlet generally called a mouthpiece, to which a fire hose can be detachably attached. When the fire hydrant is opened, water flows in from the inflow port 2, passes through the ball valve 3 and the water passage part 4, and flows into the hose connected to the outflow port 5. The part accommodating the ball valve 3 and the water passage part 4 are divided and connected by bolts.

Reference numeral 1 denotes an automatic drain valve, which has a built-in valve having a spring structure. When the ball valve 3 is opened, water pressure acts on the valve to close the automatic drain valve 1.
When the ball valve 3 is closed, the water pressure disappears, so the automatic drain valve 1 is opened and the accumulated water in the upper part is automatically drained.

When the spindle 9 is rotated by a water supply opening / closing key or the like, the horizontal shaft 3a is rotated via the gear device 8, and the horizontal shaft 3a is rotated.
The ball valve 3 also rotates integrally with a. When the ball valve 3 is in the fully open position, the inflow port 2, the through hole 3b, and the outflow port 5 are aligned in a straight line, so that a rod-type electromagnetic flowmeter can be easily inserted, which allows water leakage and communication of the water pipe. This makes it easier to investigate water capacity. Further, since it is possible to insert a fiberscope or the like, it is possible to observe by picking up the inside of the duct like a gastrocamera. Therefore, it is possible to easily carry out the examination of the pipeline where the water supply company longs for, without the need for road excavation and water cutoff.

FIG. 3 shows another embodiment, which has a structure in which a curved pipe 6 and another outflow portion 5'are provided in a straight tubular water passage portion 4 ', which is a double-ended type. The other structure is the same as that of the first embodiment.

[Effect of device]

As is clear from the above description, the underground fire hydrant of the present invention has a structure in which the inlet, the through hole of the ball valve, and the outlet are aligned in a straight line when fully opened. It can be easily inserted, which allows easy investigation of water leakage and water flow capacity of the water pipeline.

Also, since a spindle that stands upright via a gear device is connected to the outer end of the horizontal axis of the ball valve, it is possible to open and close the fire hydrant buried underground by turning the spindle, and the spindle does not tilt when opening and closing. The operability is good, and the space for housing the fire hydrant is small.

[Brief description of drawings]

FIG. 1 is a front view of a first embodiment of a linear underground fire hydrant according to the present invention, FIG. 2 is a sectional view thereof, FIG. 3 is a front view of another embodiment, and FIG. 4 is a conventional underground It is sectional drawing of a type fire hydrant. 1 ... Automatic drain valve, 2 ... inlet, 3 ... ball valve, 4
...... Water passage, 5 ... Outlet port, 8 ... Gear device, 9 ... Spindle.

Claims (1)

[Scope of utility model registration request] 1. A lower end inflow port connected to a water pipe, an outflow port provided above the inflow port and having a fire-extinguishing hose removable, and a horizontal line between the inflow port and the outflow port. A ball valve that is rotatably provided around a shaft and has a through hole that is aligned with the inflow port and the outflow port in a fully opened position, and a gear device is provided at an outer end of the horizontal axis of the ball valve. A straight underground underground fire hydrant, characterized in that an upright spindle is connected via the, and the ball valve can be opened and closed by turning this spindle.