JP5649128B2 - Water valve and fire hydrant equipped with the same - Google Patents

Description

  The present invention relates to an air valve for water supply, which is disposed in a manhole in the ground and exhausts air from the inside of a water pipe and sucks air into the water pipe, and a fire hydrant equipped with the same.

  Conventionally, for example, like the air valve for water supply of Patent Document 1, it is designed to be connected to the pipe at the lower opening, and is attached to the upper opening of the valve box and the upper opening of the valve box, A lid with a large-diameter air port, a large-diameter air port valve seat provided along the air port, and a fixed arrangement in the valve box, forming a peripheral wall, a bottom wall, and an upper part of the peripheral wall A bottomed housing with an open top and a small hole formed in the bottom wall, and a vertically movable body that can be moved up and down in the housing, and can be attached to and detached from a large-diameter air valve seat A floating valve body having an upper side surface, a lower side surface, and small air holes extending through the upper side surface and the lower side surface, and a small air hole provided on the lower side surface of the small air hole The valve seat member that constitutes the valve seat, and the valve seat is located below the floating valve body in a vertically movable manner, and can be seated on and off the small air hole valve seat. Is known in which a float valve body having a top side such.

JP 7-280118 A

  By the way, the water air valve sucks in a large amount of air from the air port in order to increase the efficiency of drainage work and prevent the water pipe from being damaged by negative pressure when draining the tap water in the water pipe.

  However, in the conventional water supply air valve, if polluted water is accumulated in the manhole where the water supply air valve is provided due to precipitation, tsunami, flood, flash flood, etc., the contaminated water is sucked into the water pipe from the air port. A new issue has arisen that water may be contaminated.

  The present invention has been made in view of the above points, and the object of the present invention is to prevent contamination of tap water by inhaling the contaminated water in the intake operation even when the contaminated water is stored in the manhole. There is to do.

  In order to achieve the above object, in the present invention, a contaminated water inhalation preventing mechanism for preventing inhalation of contaminated water from the air port is provided.

Specifically, in the first invention,
Assuming an air valve for water supply that is placed in a manhole in the ground and that removes air from inside the water pipe and sucks air into the water pipe,
The above water valve is
A valve body connected to the water pipe;
A float valve body that floats and sinks in the valve body;
A lid that covers the top of the valve body and has an air opening that is opened and closed by the float valve;
A contaminated water inhalation preventing mechanism for preventing inhalation of the contaminated water from the air port when the contaminated water is accumulated in the cavity in the manhole.

  According to the above configuration, in order to eliminate the negative pressure generated in the water pipe when draining the tap water in the water pipe, when the air is sucked by the water air valve, the water in the manhole is contaminated with a tsunami. Even if accumulated, the contaminated water inhalation preventing mechanism prevents the ingestion of contaminated water from the air port, so that contaminated water does not mix inside the water pipe. In addition, the negative pressure in the water pipe at this time may be eliminated by sucking air from a water air valve arranged in a manhole in which no contaminated water is stored.

In the second invention, in the first invention,
The contaminated water prevention mechanism is
A connecting pipe connected to the lid,
A backflow prevention valve that is provided at the tip of the connection pipe and opens and closes as the water level in the manhole changes.

  According to the above configuration, when the contaminated water accumulates in the cavity in the manhole due to a tsunami or the like, the backflow prevention valve closes, so that the intake water prevents the contaminated water from being sucked into the water pipe during the suction operation.

The fire hydrant of the third invention is
A valve box connected to the water pipe via an on-off valve;
A water supply port provided in the valve box to which a fire hose is connected;
The water valve for water supply according to the first or second invention is provided.

  According to the above configuration, even with a fire hydrant equipped with a water valve for water, when suctioning air with a water valve for water to eliminate the negative pressure generated in the water pipe when draining tap water in the water pipe, Even if contaminated water accumulates in the cavity of the manhole due to a tsunami or the like, the contaminated water suction prevention mechanism prevents the contaminated water from being sucked from the air port, so that contaminated water does not mix inside the water pipe.

  As described above, according to the first aspect of the invention, the contaminated water suction prevention mechanism is provided in the air valve for water supply so that when contaminated water is collected in the cavity in the manhole, the contaminated water is sucked from the air port. Thus, even if contaminated water is stored in the manhole, it is possible to prevent the tap water from being contaminated by sucking the contaminated water in the intake operation. For this reason, a water pipe can be kept clean even at the time of a disaster.

  According to the second aspect of the present invention, the backflow prevention valve is provided at the tip of the connection pipe connected to the lid, so that the intake of contaminated water can be prevented with an extremely simple configuration.

It is sectional drawing which looked at the air valve for water supply from the front. It is sectional drawing which shows one example of installation of the air valve for water supply. It is a perspective view which shows the air valve for waterworks. It is a top view which shows the air valve for waterworks. It is sectional drawing which shows a quick exhaust process. FIG. 2 is a view corresponding to FIG. 1 showing a water filling completion step. FIG. 2 is a view corresponding to FIG. FIG. 2 is a view corresponding to FIG. 1 illustrating a quick intake process. FIG. 2 is a view corresponding to FIG. 1 showing a backflow prevention process when contaminated water is stored in a manhole. It is the front view which fractured | ruptured partially along the XX line of FIG. 11 about the fire hydrant provided with the air valve for waterworks concerning the modification of embodiment. It is a top view which shows the fire hydrant provided with the air valve for waterworks concerning the modification of embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 2, the water pipe 2 buried below the ground 1 has a branch pipe 3 extending upward at a predetermined interval, and on the upper side of the branch pipe 3 via a repair valve 4, The water supply air valve 10 of this embodiment is connected. Above the branch pipe flange 3 a of the branch pipe 3 is exposed in the cavity in the manhole 5. By opening the lid 6 of the manhole 5, the water supply air valve 10 can be inspected and repaired. The water valve 10 serves to eliminate air inside the water pipe 2 and suck air into the water pipe 2.

  As shown in enlarged views in FIGS. 1, 3, and 4, an air valve flange 11 for connecting to the repair valve 4 and the like is provided at the lower end of the water supply air valve 10. A ball valve 12 that is normally opened is connected to the upper side of the air valve flange 11. A hollow cup-shaped valve body 13 having a circular cross section is connected to the upper side of the ball valve 12. A valve body flange 13 a is provided at the upper end of the valve body 13. Inside the valve body 13, a float guide 14 having a circular bottomed cup shape and made of polypropylene resin or the like is incorporated. A through hole 14 a is formed at the center of the bottom of the float guide 14, and a protruding portion 14 b whose outer shape is widened is formed at the upper end at intervals in the circumferential direction. The inner surface 14c of the float guide 14 has an inner diameter that gradually increases upward. The inner surface 14c is integrally provided with guide ribs 14d that extend in the up-down direction at intervals in the circumferential direction. Inside the float guide 14, a float valve body 15 is provided that floats and moves in the float guide 14 (in the valve body 13) (moves up and down by buoyancy). The float valve body 15 is made of, for example, a solid structure of polypropylene resin. The outer diameter of the float valve body 15 gradually increases upward so that the inclination angle is equivalent to the inclination angle of the inner surface 14c of the float guide 14 when viewed from the front. It is getting bigger.

  A lid body 16 is connected to the valve body flange 13 a of the valve body 13 by a lid body connecting member 17. The lid connecting member 17 is composed of a normal bolt and nut. The lid body 16 has a plate-like lid body 16a having an outer shape corresponding to the valve body flange 13a, and a circular air port 18 is opened at the center thereof. On the other hand, a protrusion 15 a capable of closing the air port 18 is integrally formed on the upper surface of the float valve body 15. The float valve body 15 is guided by the guide rib 14d and rises directly above, so that the projection 15a reliably closes the air port 18. On the upper side of the lid body 16a, the air port 18 is closed from above by a cup-shaped cap 19 having a circular cross section. The shape of the lid body 16a is not necessarily a complete circle in plan view, and may be partially cut away as shown in FIG. On the lower surface of the lid main body 16a, two screw-in type stoppers 16b and one screw-in type small valve port 16c are arranged in a triangle in plan view. And the upper surface of the float guide 14 which floated to the lower end of these stoppers 16b and the small valve port 16c contacts. A small air port 16d extending in the vertical direction is formed through the center of the small valve port 16c in the axial direction.

  A contaminated water suction prevention mechanism 20 is connected to the cap 19. Specifically, the contaminated water inhalation preventing mechanism 20 will be described. A circular through hole 19a is formed on the side surface of the cap 19, and the proximal end side of the connection pipe 21 bent perpendicularly to the through hole 19a is connected to the cap 19. Has been. A backflow prevention valve 22 that opens and closes with a change in the water level in the manhole 5 is connected to the tip that extends below the connection pipe 21.

  The backflow prevention valve 22 is a backflow having a hollow connection portion 22a connected to the tip of the connection pipe 21 and an air hole 22b that opens and closes the backflow prevention valve float 23 on the lower side. And a prevention valve main body 22c. In the present embodiment, for example, the connection portion 22a and the backflow prevention valve main body 22c are made of polypropylene resin, but may be made of metal or may be integrally formed. The backflow prevention valve float 23 includes a cylindrical portion 23a on the base end side and a spherical portion 23b on the upper side. An O-ring 24 is provided at a portion where the air hole 22b and the spherical portion 23b are in contact to prevent the contaminated water 30 from being sucked. For example, six rods 25 are fastened to the lower end of the backflow prevention valve main body 22c as shown in FIG. In FIG. 1 and FIGS. 5 to 9, the rod 25 on the back side is omitted for easy viewing. A disc-shaped float support plate 26 is fastened to the lower end of the rod 25. The backflow prevention valve float 23 is normally supported on the float support plate 26. When the contaminated water 30 is stored in the manhole 5, the backflow prevention valve float 23 floats while contacting the rod 25, and the lower part of the valve body 13 is contaminated. When it comes into contact with water 30, the backflow prevention valve float 23 floats so that the outer peripheral surface of the spherical portion 23 b comes into close contact with the O-ring 24. In this way, the contaminated water suction prevention mechanism 20 prevents the contaminated water 30 from being sucked from the air port 18 when the contaminated water 30 is accumulated in the cavity in the manhole 5.

  Next, the operation of the water supply air valve 10 according to the present embodiment will be described with reference to FIGS.

  First, in the quick exhaust process shown in FIG. 5, when a large amount of tap water is poured into the water pipe 2, the air in the water pipe 2 pushed by the tap water flows into the branch pipe 3. In this case, since the ball valve 12 is opened, air flows into the valve body 13. Since the float guide 14 and the float valve body 15 are below and the air port 18 is open, a large amount of air passes through the cap 19 and the connection pipe 21 from the air port 18 through the cap 19 and the connection pipe 21 as indicated by the arrows. To be discharged.

  Next, in the water filling completion step shown in FIG. 6, tap water flows from the branch pipe 3 when the water pipe 2 becomes full. Then, tap water is filled in the valve body 13, the float guide 14 floats, its upper surface comes into contact with the lower ends of the stopper 16b and the small valve port 16c, and tap water that flows in from the through hole 14a of the float guide 14 As a result, the float valve body 15 rises, and the projection 15 a closes the air port 18. For this reason, tap water does not flow out from the air port 18 to the outside.

  Next, in the small-scale exhaust process shown in FIG. 7, when the air in the water pipe 2 gradually accumulates in the valve body 13, the water level in the valve body 13 decreases. Then, the float valve body 15 remains attached to the air port 18 due to the pressure difference between the water pipe 2 and the outside air, but the float guide 14 gradually descends. At this time, as shown in FIG. 7, the float guide 14 tilts so as to attract the small air port 16d of the small valve port 16c, and air is automatically discharged from the small air port 16d of the small valve port 16c. For this reason, air does not accumulate in the water pipe 2.

  And the intake process (rapid intake process) shown in FIG. 8 is performed when the tap water in the water pipe 2 is drained. When draining tap water, the negative pressure in the water pipe 2 rapidly becomes negative, and in order to prevent the water pipe 2 from being damaged and to increase the efficiency of drainage work, a large amount of air is rapidly supplied from the water air valve 10 Need to be sucked into. At this time, since the backflow prevention valve float 23 is supported on the float support plate 26, the air hole 22b is opened, and a large amount of air in the manhole 5 is sucked from the air hole 22b. This air flows into the branch pipe 3 through the connection pipe 21, the cap 19, the valve body 13 and the ball valve 12.

  On the other hand, as shown in FIG. 9, in the case where this rapid intake process is performed, if the contaminated water 30 is accumulated in the cavity in the manhole 5 due to a tsunami or the like, the backflow prevention valve float 23 floats and the air holes Block 22b. Then, since the inside of the valve body 13 is negative pressure, the backflow prevention valve float 23 comes into close contact with the air hole 22b. For this reason, the backflow prevention valve 22 is closed reliably, and the contaminated water 30 is prevented from being sucked into the water pipe 2 from the air port 18 (backflow prevention step). The negative pressure in the water pipe 2 is eliminated by sucking air into the water pipe 2 from another water air valve 10 disposed in the manhole 5 where the contaminated water 30 is not accumulated.

  Therefore, according to the water valve 10 for water according to the present embodiment, the contaminated water suction prevention mechanism 20 is provided in the water valve 10, and when the contaminated water 30 accumulates in the cavity in the manhole 5, Since 30 is prevented from being sucked, it is possible to prevent the tap water from being polluted by sucking the contaminated water 30 when the contaminated water 30 is stored in the manhole 5 in the quick intake operation. For this reason, the water pipe 2 can be kept clean even at the time of a disaster. And by providing the backflow prevention valve 22 at the tip of the connection pipe 21 connected to the lid body 16, it is possible to prevent the contaminated water 30 from being sucked in with a very simple configuration.

-Modification-
FIG.10 and FIG.11 shows the modification of embodiment of this invention, and differs from the said embodiment by the point by which the air valve 110 for water supplies is attached to the fire hydrant. In addition, in this modification, the same code | symbol is attached | subjected about the same part as FIGS. 1-9, and the detailed description is abbreviate | omitted.

  An air valve flange 111 for connecting to the repair valve 4 or the like is provided at the lower end of the fire hydrant 100 provided with the water valve 110 of the present modification. The pipe line on the upper side of the air valve flange 111 is divided into two forks, and the horizontal part is in communication with the valve body 113.

  A fire-extinguishing on-off valve 112 is disposed directly above the air valve flange 111. The on-off valve 112 is provided in a sealed valve box 112a, and includes a valve stem 112b and a water stop valve 112c provided at the lower end of the valve stem 112b. A handle (not shown) is attached to the upper end 112d of the valve rod 112b protruding above the valve box 112a, and can be opened and closed by rotating the handle. A fire hose (not shown) can be connected to the water supply port 112e provided in the valve box 112a. When the on-off valve 112 is opened, tap water in the water pipe 2 is used for fire fighting via the water supply port 112e. It flows in the hose.

  On the other hand, a lid 116 is connected to the upper end of the valve body 113. A float guide 114 is built in the valve body 113, and a spherical float valve body 115 is disposed below the float guide 114. An air port 118 is disposed at the center of the lid 116. A small valve port 116c is provided at the center of the float guide 114, and a small air port 116d communicates therewith.

  And in this modification, the contaminated water suction prevention mechanism 20 similar to the said embodiment is connected to the upper end of the cover body 116. FIG. Since the internal space of the manhole 5 is limited, it is desirable to shift the attachment angle of the contaminated water suction prevention mechanism 20 by about 90 ° with respect to the direction of the maximum width of the water supply air valve 110 as shown in FIG.

  Although a detailed description is omitted, also in the water valve 110 according to this modification, the quick exhaust process, the water filling completion process, the small amount exhaust process, and the quick intake process are performed in the same manner as in FIGS. Is called.

  Therefore, also in this modification, since the contaminated water 30 is prevented from being sucked from the air port 18 when the contaminated water 30 accumulates in the cavity in the manhole 5, the rapid inhalation operation causes the manhole 5 to enter the manhole 5. When the contaminated water 30 is stored, it is possible to prevent the tap water from being contaminated by sucking the contaminated water 30.

(Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.

That is, in the said embodiment, although the float valve body 15 is made into the column shape, the shape is not specifically limited, It is good also as the float valve body 115 similar to the said modification .

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

2 Water Pipe 5 Manhole 10 Water Supply Air Valve 13 Valve Body 15 Float Valve Body 16 Lid 18 Air Port 20 Contaminated Water Suction Prevention Mechanism 21 Connection Pipe 22 Backflow Prevention Valve 30 Contaminated Water 100 Fire Hydrant 110 Water Supply Air Valve 112 On-off Valve 112a Valve box 112e Water supply port 113 Valve body 115 Float valve body 116 Cover body 118 Air port

Claims (3)

In an air valve for water supply that is arranged in a manhole in the ground, and that removes air from inside the water pipe and sucks air into the water pipe,
A valve body connected to the water pipe;
A float valve body that floats and sinks in the valve body;
A lid that covers the top of the valve body and has an air opening that is opened and closed by the float valve;
When contaminated water accumulates in the cavity in the manhole, it is equipped with a contaminated water inhalation prevention mechanism that prevents the ingestion of the contaminated water from the air port ,
The contaminated water prevention mechanism is
A connecting pipe connected to the lid,
A backflow prevention valve provided at the tip of the connection pipe, which opens and closes with a change in the water level in the manhole,
The backflow prevention valve
A connecting portion connected to the tip of the connecting pipe;
A backflow prevention valve main body that communicates with the connecting portion and has an air hole that is opened and closed by a backflow prevention valve float on the lower side;
The backflow prevention valve float is provided with a columnar portion on the base end side and a spherical portion on the upper side of the columnar portion . The water valve for water according to claim 1,
An air valve for water supply, wherein an O-ring that prevents inhalation of contaminated water is provided at a portion where the peripheral edge of the air hole and the spherical portion are in contact with each other . A valve box connected to the water pipe via an on-off valve;
A water supply port provided in the valve box to which a fire hose is connected;
A fire hydrant comprising the water valve for water supply according to claim 1 or 2.

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