JP2000220169A - Fire hydrant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively prevent spouting water from splashing during inspection, and render its bulkiness small. SOLUTION: A hose insertion metal piece 12 is screwed via a ring 16. The ring 16 is formed with a projection 17, and during inspection, as the valve is opened, spouting water from a fine interstice (a) hits the projection 17 to turn in the downward direction, and moreover, the turned water fills in a part of the outlet 6 of a valve box 1, resulting in the prevention of splash. At this time, by causing spouting water to be scattered therearound by forming a plurality of slits and small holes on the projection 17, and a plurality of small projections on the rear surface of the projection 17, splash can be prevented more effectively through the agency of the mutual interference of spouting water. Consequently, interposing only a sheet of the ring 16 can prevent splash inexpensively, and also restrain it from being bulky.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is disposed at the top of a T-shaped pipe from a water supply pipe buried underground and is always closed without water leakage, and is used for multipurpose such as emergency fire extinguishing water and water supply. TECHNICAL FIELD The present invention relates to a fire hydrant of a ball valve type, and more particularly to a fire hydrant which prevents splashing of spouted water during valve inspection.

[0002]

2. Description of the Related Art As shown in FIG. 6, a ball valve type fire hydrant A is provided with a ball-shaped valve body 2 rotatably mounted on a valve box 1 via a valve seat 3 and a water passage 4 of the valve body 2 as shown in FIG. Is connected to the inflow port 5 and the outflow port 6 of the valve box 1 to guide the fire-extinguishing water to the fire-extinguishing water port 7. A valve shaft 8 is fitted to the valve body 2, and the valve shaft 8 is connected to a prismatic cap 10 via a worm gear mechanism 9. When the cap 10 is rotated by a T-shaped opening handle 11, The valve body 2 rotates to be in the above-mentioned communication state, and the water passage 4 is in a direction perpendicular to the inflow / outflow ports 5 and 6 to shut off the flow path. That is, the valve is opened and closed.

[0003] The fire extinguishing water port 7 is attached to the valve box 1 by a hose fitting 1.
The press fitting 13 is fitted on the hose fitting 12 and the cap 14 is covered.

The fire hydrant A is usually closed, and needs to be inspected about once every one to two months so that there is no problem in an emergency. Since the inspection is performed for each fire hydrant A, the operation is often checked without connecting a fire hose in consideration of workability. Is rotated and slightly opened, a minute gap a is formed between the valve body 2 and the valve seat 3.
At this time, a high water pressure is applied to the fire hydrant A, and the water may splatter vigorously from the gap a to cause damage to the inspector who is looking into the fire hydrant A for work confirmation.

For this reason, Japanese Unexamined Patent Publication No. Hei 9-140823 discloses that, as shown in FIG.
An annular shield 30 having an outlet 1 is provided on the outlet 6 side of the valve box 1, and as shown by an arrow, the jet water is applied to the ridge 31 to change the direction and to lower the jet speed, thereby making the outlet 6
Also, there is disclosed a technology for preventing water from scattering by accumulating water in a fire extinguishing water port 7 portion. Further, in this publication, the axis of the outlet 6 of the valve box 1 and the axis of the fire extinguishing water port 7 are eccentric to form a discontinuous surface therebetween, and the jetted water is applied to the step surface (discontinuous surface). Similarly, a technique for preventing scattering is disclosed.

[0006]

In each of the above-mentioned conventional techniques for preventing scattering, the water jetted from the small gap a is turned multiple times in a zigzag manner as shown by the arrow in FIG. To prevent scattering. Therefore, a plurality of ridges 31 for scattering are required, and the distance from the outflow port 6 of the valve box 1 to the fire extinguishing water port 7 (hose fitting 12) becomes longer, and the volume of the fire hydrant A increases accordingly. Recently, it has been desired that the height of the fire hydrant A be as low as possible, and it is not preferable that the height be large.

[0007] It is an object of the present invention to efficiently prevent the jet water from scattering and to reduce the bulk.

[0008]

The first means for achieving the above object is to use the water jetted from the small gap a as a valve 2
He turned around. If the spouted water is turned to the valve body 2 side, water fills the outlet side portion of the valve body 2 and the valve box 1, and the water spouted from the minute gap also hits the filled water, and the ejection speed is increased. Is also reduced, and scattering is effectively prevented.

A second means for achieving the above object is:
The direction change of the jet water from the small gap a is diffused (scattered) in all directions. If scattered,
The scattered jet waters interfere with each other and decelerate, so that scattering is effectively prevented.

As described above, if the spouting water is effectively prevented from scattering, only one scattering prevention device (the above-mentioned ridge) need be provided, that is, it is not necessary to provide the device in a plurality of stages. Also does not rise.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the invention according to the above-mentioned first means, a small gap formed between a valve body and a valve seat when a valve is opened when inspecting a fire hydrant is provided on an inner surface of a flow passage. A protrusion may be provided which is diverted toward the valve body by the water jetted from the valve, and the protrusion may have a size that does not hinder the flow of the fire-extinguishing water when the valve is fully opened.

When the minute gap is near, the jet water hits the ridge at an acute angle and smoothly changes its direction toward the valve body, and the changed water fills the valve box outlet to prevent scattering. In addition, a sufficient amount of fire-extinguishing water can be obtained by appropriately selecting the size of the ridge that does not hinder the flow of the fire-extinguishing water when the valve is fully opened by an experiment or the like, and setting the size.

[0013] As an embodiment of the invention according to the second means, the water jetting from the gap is formed on the inner surface of the flow passage near the minute gap generated in the valve body and the valve seat when the valve is opened when checking the fire hydrant. The protrusion has a size that does not interfere with the flow of fire-extinguishing water when the valve is fully opened, and the protrusion has a plurality of small holes or slits or a plurality of protrusions on the contact surface of the jet water. May be provided.

In this configuration, the jet water hitting the ridge is
Scattering is caused by the presence of small holes, slits, and unevenness, and scattering is effectively prevented by mutual interference caused by the scattering.
This scattering configuration can also be employed in the first means.
That is, a plurality of slits, small holes, or a plurality of irregularities can be provided on the contact surface of the projected water of the projected ridge on the ridge that changes the direction of the ejected water toward the valve body.

In each of the above constructions, the fire extinguishing water port is formed by screwing a hose fitting into the valve box, a ring is interposed between the bottom of the screw hole and the hose fitting, and the ridge is provided on the inner surface of the ring. A configuration may be formed.

In this way, by providing (intervening) the ring with the ridge in the mounting hole of the hose fitting of the existing fire hydrant, it is possible to prevent the spouting water from being scattered at a low cost and to minimize the bulkiness. Can be suppressed.

In this structure for fitting the ring, between the ring and the inner surface of the screw hole, when the ring is located at the bottom of the screw hole, positioning means for positioning the ridge just above the minute gap is provided. If provided, the positioning of the ring is not required, and scattering of the jet water can be prevented only by fitting the ring into the screw hole.

As the positioning means, a positioning projection is formed on the outer surface of the ring, and a groove is formed from the upper end of the screwing hole to the inner surface of the screwing hole, the groove being guided by the projection. When the protrusion is fitted into the groove and the ring is located at the bottom of the screw hole, the protrusion is positioned close to the minute gap.

In any of the above constructions, if the ridge is made of an elastic body, the fire rushes out of the fire-extinguishing water when the valve is fully opened, so that the elastic ridge flexes in the flow direction to reduce the flow resistance as much as possible. I do. In addition, if the ring is also made of an elastic body, it acts as a packing and also serves to prevent water leakage from the threaded portion of the hose fitting. That is, there is no water leakage during the pressure test and fire extinguishing.

[0020]

FIG. 1 to FIG. 5 show an embodiment of a fire hydrant A according to the present invention. In the fire hydrant A, a ball-shaped valve body 2 is rotatably mounted on a valve box 1 via a valve seat 3 in the same manner as in the above-mentioned conventional example. When the flow passage 4 of the valve body 3 communicates with the inflow port 5 and the outflow port 6 of the valve box 1, the fire extinguishing water is guided to the fire extinguishing water port 7. Valve seat 3
Is composed of a ring in which a core is provided at the center of an elastic body such as hard rubber, or a ring in which a resin is coated on the inner surface of the outer surface of the elastic body.

The ball-shaped valve body 2 has a concave portion 2a having a rectangular cross section in a direction perpendicular to the flow passage 4, and a lateral valve rod 8 is fitted in the concave portion 2a. The valve stem 8 is connected to a prismatic cap 10 through a worm gear mechanism 9. When the cap 10 is rotated by a T-shaped opening handle 11, the valve body 2 rotates through the gear mechanism 9 and the valve shaft 8. I do. When the valve element 2 rotates, the flow passage 4 communicates with the outflow ports 6 and 5 (coaxially), so that the fire hydrant A is opened, and the axis of the flow path 4 is connected to the axis of the outflow ports 6 and 5. The hydrant A is closed by being in the orthogonal direction.

The fire extinguishing water port 7 is connected to the valve box 1 by a hose fitting 12.
The pressing ring 13 is fitted to the hose fitting 12. Between the screwed end of the hose fitting 12 and the bottom of the screwed hole 15, a spouting water scattering prevention ring 16, which is a feature of the present invention, is interposed. As shown in FIG. 3A, the ring 16 is formed such that the inner edge is eccentric and the inner edge is widened to form the ridge 17.
As shown in FIG. 1B, the inner edge of one side is projected so that the ridge 1 is formed.
7 is formed. FIG.
A slit 18 is formed as shown in FIG.
9 or small projections (irregularities) 20 on the back surface. These slits 18 are
9. The size and number of the small projections 20 are appropriately set in consideration of the above-described scattering effect.

The amount of protrusion (width, size) of the ridge 17 of the ring 16 is determined by conducting experiments and the like so as to effectively block and mitigate the spouting water, which will be described later, and to prevent the fire extinguishing water from flowing out. Is set as appropriate. A projection 21 is provided on one outer edge of the ring 16, and the projection 21 is formed in the groove 2 of the screw hole 15.
2, the ridge 17 of the ring 16 is positioned near the minute gap a generated between the valve body 2 and the valve seat 3 when the valve is opened. This projection 21 is not necessary if it can be positioned by other means. Without the projection 21, the ring 16 can also be screwed into the screw hole 15. The ring 16 (protrusion 17) is made of an elastic material such as hard rubber or the like, and a core is provided in the center thereof. The ring 16 is set in the bottom of the screw hole 15 and set by screwing the hose fitting 12.

This embodiment has the above structure. As shown in FIG. 5, when inspecting the fire hydrant A, the valve body 2 is slightly turned, for example, about 6 degrees from the fully closed state. 2
And a small gap a (about 0.5 mm) in the valve seat 3
Water spouts from the gap a as indicated by the dashed arrow. At this time, since the ridge 17 is located near (immediately above) the gap a, the jetted water comes into contact with the ridge 17 and is turned downward, and the changed water is discharged from the outlet 6. Charging part. For this reason, water scattering to the worker is prevented.

[0025]

As described above, according to the present invention, scattering of the jet water is effectively prevented by turning the jet water toward the valve body or scattering the jet water, so that the volume of the fire hydrant can be reduced. It may correspond to a request.

[Brief description of the drawings]

FIG. 1 is a cutaway front view of one embodiment.

FIG. 2 is a plan view of the embodiment.

FIG. 3 is a plan view showing each example of the scattering prevention ring of the embodiment.

4A and 4B show other examples of the ring, wherein FIGS. 4A and 4B are plan views, and FIG. 4C is a bottom view.

FIG. 5 is an operation diagram of the embodiment.

FIG. 6 is a cutaway front view of an example of a ball valve type fire hydrant.

FIG. 7 is a cutaway front view of a conventional example.

8 (a) is a plan view and FIG. 8 (b) is a cut-away front view of the scattering prevention ring of the conventional example.

9A and 9B show the same ring, wherein FIG. 9A is a plan view and FIG.

[Explanation of symbols]

 A Fire hydrant a Micro gap 1 Valve box 2 Valve body 3 Valve seat 4 Valve body flow path 5 Valve box inlet 6 Valve box outlet 7 Fire extinguishing port 8 Valve rod 12 Hose fitting 15 Hose fitting screw hole 16 Shatter prevention ring 17 Projection for preventing scattering 18 Slit 19 Small hole 20 Small projection 21 Positioning projection 22 Guide groove

Claims (7)

[Claims] When the ball valve type fire hydrant A is inspected, water jetted from the gap a hits the inner surface of the flow passage near the minute gap a generated in the valve body 2 and the valve seat 3 when the valve is opened. A fire hydrant, characterized in that a ridge 17 that changes direction is provided on the valve body 2 side, and the ridge 17 has a size that does not hinder the flow of fire-fighting water when the valve is fully opened. 2. The ridge 17 has a plurality of slits 18, small holes 19, or a plurality of irregularities 20 provided on the contact surface of the ridge 17 with the blast water, so that the blast water hitting the ridge is scattered. The fire hydrant according to claim 1, wherein: 3. A ridge in which water spouted from the gap a strikes the inner surface of the flow passage near the minute gap a generated in the valve body 2 and the valve seat 3 when the valve is opened when inspecting the fire hydrant A of the ball valve type. The ridge 17 has a size that does not hinder the flow of the fire-extinguishing water when the valve is fully opened, and the ridge 17 has a plurality of slits 18, small holes 19, or a contact surface of the spouted water with the ridge 17. A fire hydrant in which a plurality of irregularities 20 are provided so that the jet water hitting the ridge 17 is scattered. 4. The fire extinguishing water port 7 is connected to the valve box 1 by the hose fitting 1.
2. A ring 16 is interposed between the bottom of the screw hole 15 and the hose fitting 12, and the ridge 17 is formed on the inner surface of the ring 16. 3. The fire hydrant according to any one of 3. 5. A positioning means for positioning the ridge 17 between the ring 16 and the inner surface of the screw hole 15 when the ring 16 is located at the bottom of the screw hole 15. The fire hydrant according to claim 4, wherein the fire hydrant is provided. 6. A positioning projection 21 is formed on the outer surface of the ring 16 and a groove 22 is formed from the upper end to the bottom of the screw hole 15 to be guided by fitting the projection 21 into the inner surface of the screw hole 15. When the protrusion 21 is fitted into the groove 22 and the ring 16 is located at the bottom of the screw hole 15, the ridge 17 is positioned close to the minute gap a, thereby forming the positioning means. The fire hydrant according to claim 5, wherein 7. The fire hydrant according to claim 1, wherein the ridge 17 is made of an elastic material.