JP2002276836A - Fire hydrant equipped with rapid air valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire hydrant equipped with a rapid air valve with a simple constitution capable of discharging a large amount of air. SOLUTION: The fire hydrant equipped with rapid air valve is provided with A: a valve box 2 provided with a valve cap 7; B: a first valve rod 11 provided rotatably and vertically non-movably against the valve cap; C: a second valve rod 9 advanceably/retreatably thread-engaged with the first valve rod and provided non-rotatably and vertically movably against the valve cap; D: a valve element 1 provided at a tip end of the second valve rod and opening/ closing a communication from a lower opening 2A to an upper opening 2B of the valve box; E: a guide member with communication hole 25 provided in the first valve rod; F: a float valve element 21 accommodated in the guide member; a floating valve element 22 vertically movably in the guide member accompanying with the float valve element, formed with discharge holes 27, 29 opened/closed by the float valve element and capable of discharging an air to the outside through the communication hole by descending it to a lower part as compared with the communication hole 25 at an upper part of the side surface of the guide member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire hydrant with a quick air valve which can automatically discharge air accumulated in a water distribution line of a fire hydrant regardless of the amount of the air. More specifically, the present invention relates to an underground fire hydrant with an air valve, and in particular, to automatically discharge a large amount and a small amount of air that flows or accumulates in a water pipe at normal times (other than fire extinguishing activities or similar activities), that is, when closing. It relates to an underground fire hydrant with an air valve.

[0002]

Background of the Invention When air accumulates in a water distribution pipe, the water discharge at the time of fire extinguishing fluctuates or intermittent water flows, which hinders a smooth fire extinguishing activity. In addition, if air pools are always formed in the water distribution pipe, that part also has a relationship such as oxidation,
Corrosion is likely to occur. In recent years, bacteria that are particularly resistant to chlorine sterilization have been generated, and it does not necessarily lead to the generation of not only anaerobic but also aerobic bacteria. Such corrosion also leads to the generation of water leakage, and the greater the air volume, the greater the loss of water, the lower the water flow capacity, and the poorer the flow rate economic effect. Also, even if an air valve mechanism is provided, a small amount of exhaust that does not reach the standard will result in a large initial air exhaust which is not complete and will create a large air pocket, which will cause pressure fluctuations in the pipes, amplify pulsation, and increase smoothness. Water will be affected. further,
It could not be said that there was no influence on the durability and operability of the pipe joints and equipment.

[0003] By the way, a conventional fire hydrant with an air valve (for rapid use) has a shape in which a quick air valve is attached beside an underground fire hydrant (standard or quasi-standard), or has a wide shape integrally. Although commonly used today, fire hydrant boxes have become larger, construction costs have been higher, and material costs have increased significantly. In addition, the body weight was considerably heavy and workability was poor.

A conventional underground fire hydrant with a built-in air valve has an extremely large number of parts, is expensive, and is difficult to assemble and maintain. Especially, urgent maintenance has to be said to be difficult. Moreover, in the event of a fire, there must be no local response in protecting human lives and property.

Furthermore, in the case of the underground fire hydrant with a built-in air valve, a valve element for opening and closing the communication from the lower opening on the water supply side to the upper opening on the drain side of the main body case (valve box) is provided by the rotation of a screw shaft-shaped spindle. It is moved up and down by operation,
An air valve was built in the valve body. Therefore, an air valve must be built in the valve body and the valve body must be built in the valve box so as to be able to move up and down. Also,
Since the air valve is completely housed in the valve box, securing an exhaust path from the air valve to the outside of the valve box is complicated.

In addition, there is a connection point between the valve body and the valve rod portion in the water contacting portion, and delicate rust, fine dust, stones, etc. from the inside of the pipe to the delicate valve seat rubber may cause water leakage. No measures could be taken in case. The fire hydrant box overflowed and manufacturers had to take countermeasures or use a repair valve to reach into the full box and stop it. During this water leakage period, fire extinguishing activities could not be performed, and if fire extinguishing activities were performed, air could be drawn in by negative pressure or the power of water discharge, and fire extinguishing activities during normal times could be difficult.

Further, since the small-diameter exhaust air hole of the valve seat rubber of the air valve has a small diameter, fine particles in the pipe may be clogged, which may cause water leakage. In that case,
With the conventional one, it is difficult to respond immediately, and if the response is extremely delayed, tap water overflows from the fire hydrant box, and the water overflowing on the road freezes during severe cold, which may cause an accident or complaint.

Further, in the structure of the conventional air valve, there is a possibility that sewage, rainwater and muddy water may flow back into the fire hydrant box and flow into the main pipe through the air valve. There was nothing to defend against, so we had to respond quickly in the early stages. It was very difficult to go deep into the mud pool and stop the cock of the repair valve, and even more so in heavy rains and storms.

Further, in the conventional structure, since parts are finely divided at many points, efficiency is low in terms of assembly, cost, productivity and the like. In addition, since the connecting parts such as the valve stem and valve body are complicated, maintenance is difficult on site and expertise,
Jig material was also required.

The present invention has been made in view of the above circumstances, and a main object of the present invention is to provide a fire hydrant with a quick air valve capable of mass discharge with a simple structure.

[0011]

In order to achieve the above object, a fire hydrant with a quick air valve according to the present invention is characterized by having the following constitutions (1) to (7). (1) A valve box in which a lower opening on the water supply side and an upper opening on the drain side are formed, and a valve cover is provided on an upper portion facing the lower opening. (2) A cylindrical first valve stem that is rotatable with respect to the valve lid and is not movable up and down. (3) A cylindrical second valve stem which is screwed to the first valve stem so as to be able to advance and retreat, and is provided so as to be non-rotatable and vertically movable with respect to the valve cover. (4) A valve element that is provided on the outer periphery of the distal end of the second valve stem and that opens and closes communication from the lower opening to the upper opening of the valve box as the second valve stem moves up and down. (5) A guide member provided in the first valve stem and having a communication hole formed in a lower end portion and a side surface. (6) A float valve body accommodated in the guide member and provided to be movable up and down in accordance with the amount of water in the guide member by floating on the water. (7) An exhaust hole which is accommodated in the guide member while being arranged above the float valve body, is capable of moving up and down with the float valve body, and is configured to exhaust air entering the guide member to the outside. A floating valve element which is capable of opening and closing the exhaust hole by a float valve element, and is capable of exhausting air to the outside through the communication hole by descending below the communication hole at the upper side of the guide member.

Alternatively, a fire hydrant with a quick air valve according to the present invention is characterized by comprising the following constitutions (1) to (6). (1) A valve box in which a lower opening on the water supply side and an upper opening on the drain side are formed, and a valve cover is provided on an upper portion facing the lower opening. (2) A cylindrical valve stem that is screwed to the valve lid so as to be able to move up and down. (3) A valve element which is provided on the outer periphery of the distal end of the valve stem and opens and closes the communication from the lower opening to the upper opening of the valve box as the valve stem moves up and down. (4) A guide member provided in the valve stem and having a communication hole formed in a lower end portion and a side surface. (5) A float valve body accommodated in the guide member and provided to be able to move up and down in accordance with the amount of water in the guide member by floating on the water. (6) An exhaust hole which is accommodated in the guide member while being arranged above the float valve body, is capable of moving up and down with the float valve body, and is configured to exhaust air entering the guide member to the outside. A floating valve element which is capable of opening and closing the exhaust hole by a float valve element, and is capable of exhausting air to the outside through the communication hole by descending below the communication hole at the upper side of the guide member.

Further, the fire hydrant with a quick air valve of the present invention comprises:
Preferably, in addition to any one of the above configurations, the guide member is formed in a substantially cylindrical shape with an upward opening, and a lower surface thereof is formed so as to bulge downward substantially in a spherical shape, and the guide member is formed in a state where the floating valve element is most lowered. A communication hole is formed in the side surface which is the upper and lower positions and the center of the lower surface. Further, the float valve body is formed in a substantially spherical shape. Further, the floating valve element has a substantially disk shape slightly smaller in diameter than the inner diameter of the guide member, and has an exhaust hole penetrating in the vertical direction at the center. A float retainer is provided on the upper portion of the guide member to prevent the floating valve body from falling off from the guide member. At the center of the float retainer, air from the floating valve body or the guide member is exhausted outward. Exhaust holes are formed.

[0014] More preferably, in addition to the above configuration, the exhaust from the float retainer is performed through a cover opened at a lower end portion. A closing float is provided so as to be able to move up and down, and a gate is provided between the exhaust hole side of the float retainer and the lower opening of the cover, and a gate which can be closed by raising the closing float is provided on the cover. It is a fire hydrant with an air valve.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A fire hydrant with a quick air valve according to the present invention will be described below in more detail with reference to embodiments. 1 to 3 are longitudinal sectional views showing one embodiment of a fire hydrant with a quick air valve according to the present invention. FIG. 1 shows a normal state when the valve body 1 is closed, and FIG. At this time, FIG. 3 shows a state where the valve body 1 is opened.

The fire hydrant of this embodiment is an underground fire hydrant with a quick air valve for water supply, and has a valve box 2 as a main body case. The valve box 2 includes a substantially cylindrical main body 3 that opens in the vertical direction, and a bend-shaped branch pipe line 4 that branches off from the peripheral side surface of the main body 3 into a 90-degree arc shape and opens upward. It is formed integrally. The lower part of the main body 3 is slightly reduced in diameter from the connection with the branch pipe 4 to form an inflow pipe 5.
A flange 6 is formed at the lower end of the inflow pipe 5.

A valve cover 7 is attached to the upper opening of the valve body 3. The valve lid 7 has a substantially cylindrical shape, and a flange 8 is integrally formed at the center of the outer peripheral surface in the vertical direction. With the lower part of the valve lid 7 inserted into the upper opening of the valve body 3, the flange 8 is abutted against the upper surface of the valve body 3 in an airtight manner and fixed. At the lower end of the valve cover 7, a rotation stopper 10 for a second valve rod 9 described later is formed so as to protrude radially inward.

A first cylindrical valve rod 11 is fitted and attached to the valve cover 7. At this time, the first valve stem 1 is inserted into an annular concave groove 12 having a substantially rectangular cross section formed on the inner peripheral surface of the valve lid 7.
An annular convex portion 1 having a substantially rectangular cross section and projecting from the outer peripheral surface of
3 is fitted. Therefore, the first valve rod 11 is rotatable with respect to the valve lid 7 and is not movable up and down.

A female thread 14 is formed on the inner peripheral surface of the lower end of the first valve rod 11, and the female thread 14 has a second thread.
The valve stem 9 is screwed forward and backward. The second valve stem 9 has a substantially cylindrical shape, and a male thread portion 15 formed on the outer peripheral surface thereof is screwed to the female thread portion 14 of the first valve stem 11. A flange-shaped projection 16 is integrally formed on the upper end of the second valve stem 9, and the projection 16 prevents the first valve stem 11 from coming off.

On the outer peripheral surface of the second valve stem 9, a part of the circumferential direction is cut out along the vertical direction (longitudinal direction) so as to have a substantially rectangular cross section, and a concave groove is formed. The rotation stopper 10 of the valve cover 7 is inserted. Therefore, the second valve stem 9 cannot rotate with respect to the valve lid 7 and can move up and down with respect to the first valve stem 11.

On the outer peripheral surface of the lower end portion of the second valve rod 9, a flange-shaped flange portion 17 is provided which protrudes radially outward. A packing 18 is disposed on a lower end surface of the flange portion 17, and the packing 18 is positioned by a packing retainer 19. In this manner, the valve element 1 including the packing 18 and the like is attached to the tip of the second valve rod 9.

The valve element 1 (packing 18) of the second valve rod 9 is
From the lower opening 2A (inflow pipe 5) of the valve box 2 to the upper opening 2B
(Branch line 4) is adjusted. That is, when the second valve stem 9 is lowered by rotating the first valve stem 11, the packing 1 on the lower surface of the flange 17 of the second valve stem 9 is removed.
8 is in close contact with the upper end surface of the inflow pipe 5 of the valve box 2 to block communication from the lower opening 2A of the valve box 2 to the upper opening 2B. In this state, the lower end portion 9A of the second valve stem 9
And the packing presser 19 are slightly inserted into the upper end of the inflow pipe 5 of the valve box 2. Also, the first valve stem 1
When the valve 1 is rotated in the reverse direction, the second valve stem 9 rises, the valve element 1 separates from the upper part of the inflow pipe 5 of the valve box 2, and communicates from the lower opening 2 A of the valve box 2 to the upper opening 2 B. Will be realized.

A quick air valve is built in the upper part of the first valve rod 11. The rapid air valve according to the present embodiment includes a guide member (float valve body guide) 20, a float valve body 21, and a floating valve body 2.
2 and a float presser 23. The guide member 20 has a substantially cylindrical shape that opens upward, and has a flange 24 integrally formed at the upper end thereof so as to protrude radially outward. The outer diameter of the flange 24 of the guide member 20 is equal to the outer diameter of the first valve rod 11.
Therefore, the lower surface of the flange 24 abuts on the upper end surface of the upper opening of the first valve stem 11, and the guide member 20
It is held at 1. The outer diameter of the guide member 20 is smaller than the inner diameter of the first valve rod 11, and the outer peripheral surface of the guide member 20 and the first
The valve rod 11 is disposed in a state where a gap for entering water or air is formed between the valve rod 11 and the inner peripheral surface.

The lower end surface of the guide member 20 is formed to project slightly downward in a shallow, substantially spherical shape. Guide member 2
0, communication holes 25, 25 ... communicating with the inside and outside of the guide member are formed in the lower end surface and the side surface, respectively. In the illustrated example, a plurality of communication holes 25A and 25B are formed on the side surface of the guide member 20 so as to be vertically separated from each other in two rows at the center of the lower surface of the guide member 20.

The float valve 21 of this embodiment is formed in a spherical shape having a diameter slightly smaller than the inner diameter of the guide member 20. The float valve body 21 is housed in the guide member 20 so as to be vertically movable, and is formed so as to float on water. Therefore, the float valve element 21 can be moved up and down according to the amount of water in the guide member 20.

The floating valve element 22 of the present embodiment is
Is formed in a disk shape having a diameter slightly smaller than the inner diameter of the disk, is accommodated in a guide member so as to be vertically movable, and is formed so as to float on water. A stepped substantially circular hole is formed in the center of the floating valve body 22 so as to penetrate in the vertical direction. The lower small-diameter hole is formed as a tapered hole whose diameter decreases as going downward, and a conical valve seat 26 having a size substantially adapted to this is fitted into the tapered hole.

At the center of the conical valve seat 26, for example, about 2 m
A hole (exhaust hole) 27 of about m is formed so as to penetrate vertically. The conical valve seat 26 is fixed by a valve seat retainer 28 attached to an upper large diameter hole of the floating valve body 22. The valve seat retainer 28 has a substantially disk shape having a central portion formed through an exhaust hole 29 having a diameter larger than that of the exhaust hole 27 of the conical valve seat 26. A male screw formed on an outer peripheral surface of the valve seat retainer 28 is provided with a floating valve body. 22 and is screwed into a female screw formed on the inner peripheral surface of the large-diameter hole. As a result, the conical valve seat 26 is prevented from dropping from the floating valve element 22.

On the upper surface of the flange 24 of the guide member 20,
The float retainer 23 is attached. The float retainer 23 is formed in a disk shape having an outer diameter equal to the outer diameter of the flange 24 of the guide member 20, and the lower end surface of the outer peripheral portion thereof is connected to the guide member 2.
No. 0 is disposed in contact with the upper surface of the flange 24. At the center of the float holder 23, an exhaust hole 3
0 is formed. In the illustrated example, the exhaust hole 30 has a larger diameter than the exhaust hole 29 of the valve seat retainer 28 and a smaller diameter than the outer diameter of the valve seat retainer 28.

The positioning of the float presser 23 with respect to the guide member 20 is performed by a third valve stem 31 connected to an upper portion of the first valve stem 11. The third valve stem 31 has a substantially cylindrical portion 32 opened downward at the lower portion, and the cylindrical portion 32
Has an inner diameter matching the outer diameter of the first valve rod 11. Therefore,
If the cylindrical portion 32 of the third valve stem 31 is fitted into the first valve stem 11 so as to cover the upper part of the first valve stem 11, the first valve stem 11 and the third valve stem 31 are integrally fixed. Good. Thereby, the float presser 23 is positioned by being sandwiched between the upper end surface of the first valve rod 11 or the flange 24 of the guide member 20 and the upper surface of the cylindrical portion 32 of the third valve rod 31.

The upper portion of the cylindrical portion 32 of the third valve stem 31 is a substantially conical portion 33 whose diameter decreases as going upward, and a shaft portion 34 is integrally formed on the upper end of the conical portion 33. ing. At the center of the inner upper surface of the cylindrical portion 32 of the third valve stem 31, the exhaust hole 30 of the float retainer 23 and the conical portion 3
An exhaust hole 35 that communicates with the outside of the fuel cell 3 is formed.

The third valve stem 31 is preferably covered with a cover 36. The cover 36 of the present embodiment is provided with a shaft cover 37 which is fitted on the shaft 34 of the third valve stem 31 at the upper part. The outer shape of the shaft cover portion 37 is formed in a square rod shape that is rotated by a fire hydrant opening / closing tool. The shaft cover 37 is attached so as to rotate integrally with the third valve stem 31.

At the lower end of the shaft cover 36, a substantially cylindrical cover body 36A is provided. Cover body 36A
Has a substantially cylindrical shape with a larger diameter than the third valve stem 31 and is attached so as to cover the third valve stem 31. The cover 36 having such a shape has an opening 38 formed only at the lower portion. In the illustrated example, the opening 3 is provided on the lower surface of the cover body 36A.
8 are formed.

At the center in the vertical direction of the inner peripheral surface of the cover body 36A, a disk-shaped protrusion 39 is formed to protrude radially inward. A gap (gate) 40 is formed between the tip of the projection 39 and the outer peripheral surface of the third valve stem 31. The projecting portion 39 is located below the exhaust hole 35 opened in the conical portion 33 of the third valve stem 31 and has a cover 36.
Above the lower opening 38.

A closure float 41 is mounted below the gate 40 of the cover body 36A so as to be vertically movable. The closed float 41 of the present embodiment is substantially disc-shaped, and has an inner diameter adapted to the outer diameter of the third valve rod 31, and the outer diameter is formed smaller than the inner diameter of the cover 36. Then, the closing float 41 is attached by inserting its inner diameter into the outer peripheral surface of the third valve rod 31.

The closing float 41 is normally arranged to be lowered to the lower end of the cover 36 by gravity, but in this state, a part or the entirety of the lower opening 38 is opened. On the other hand, when trying to flood the inside of the cover 36 from the outside, the closing float 41 rises by buoyancy and rises until it comes into contact with the lower surface of the protrusion 39 of the cover 36 (the closing float 4 shown by a two-dot chain line in FIG. 1).
1). As a result, the gate 40 of the cover 36 is closed, and the float 41 is closed in an airtight state, so that the intrusion of water into the inner side is prevented.

A base 43 is provided in the upper opening 2B of the branch pipe 4 of the valve box 2 via a connecting pipe 42, and a base 44 is provided in the base 43. The base 44 is provided with a press ring 45, and a base lid 46 is provided at an upper end thereof.

In the fire hydrant of this embodiment, the flange 6 at the lower end of the valve box 2 is connected to the flange 51 of the repair valve 50, and is connected to the water pipe through the repair valve 50 and the connection pipe. Normally, as shown in FIG. 1, the second valve stem 9 extends downward with respect to the first valve stem 11, and the valve element 1 at the lower end of the second valve stem 9 is formed.
The (packing 18) is in contact with the outer periphery of the upper end of the inflow pipe 5. In this state, the inflow pipe 5 is communicated only with the second valve rod 9, and the inflow pipe 5 and the branch pipe 4 of the valve box 2 are not in communication. Therefore, water from the lower opening 2 </ b> A of the valve box 2 (the lower part of the inflow pipe 5) fills the first valve rod 11 through the second valve rod 9.

Then, since a plurality of communication holes 25 are formed in the guide member 20 in the first valve rod 11, water enters the guide member 20. As a result, the float valve body 21 in the guide member 20 rises due to the buoyancy of the water, and the upper part of the float valve body 21 is brought into the state shown in FIG. 1 in which the discharge ports 27 and 29 of the floating valve body 22 are closed. Therefore, outflow of water from the floating valve body 22 to the outside is prevented.

Now, assuming that minute air enters the fire hydrant from the water pipe, the air rises through the second valve rod 9 and enters the guide member 20 through the communication hole 25C at the lower portion of the guide member 20, and the like. It moves to the upper part of the guide member 20. The air that has risen between the float valve element 21 and the floating valve element 22 pushes the float valve element 21 slightly downward, and the exhaust holes 27 and 29 of the floating valve element 22, the exhaust holes 30 of the float presser 23, The gas is discharged to the outside of the fire hydrant through the exhaust hole 35 of the three valve rod 31 and the lower opening 38 of the cover 36.

On the other hand, when a relatively large amount of air enters the fire hydrant, the air valve in the first valve rod 11 rapidly exhausts.
That is, in this case, as shown in FIG. 2, a large amount of air temporarily accumulates on the upper part of the guide member 20, so that water in the guide member 20 decreases and the float valve body 21 loses buoyancy. As it goes down, the floating valve body 22 also goes down due to gravity. In this state, the exhaust holes 25 (25A), 25
(25B) is arranged. Therefore, the air flows through the floating valve body 22.
Is rapidly exhausted to the outside of the fire hydrant through the exhaust hole 30 of the float retainer 23, the exhaust hole 35 of the third valve rod 31, and the lower opening 38 of the cover 36 through the exhaust hole 25 </ b> A arranged above.

When the air is discharged, the idle valve 2
The water flows through the guide member 2 through an exhaust hole 25B arranged at a lower portion of the guide member 2 and an exhaust hole 25C formed at the lower surface of the guide member 20.
The float valve body 21 and the floating valve body 22 that have flowed into the chamber 0 and have obtained buoyancy rise and return to the state of FIG.

When the water supply pipe side has a negative pressure, the float valve element 21 (or the floating valve element 22) descends downward, and the lower opening 38 of the cover 36, the third valve rod 31
By sucking outside air through the exhaust hole 35 of the float holder 23 and the exhaust hole 30 of the float retainer 23, the negative pressure can be eliminated.

When the fire hydrant is used, the shaft cover 3
7 by rotating the first valve stem 11 through the third valve stem 31.
Can be rotated. Here, the first valve stem 11 is rotatable with respect to the valve cover 7 and cannot move up and down, and the second valve stem 9 is
, And can move up and down. Accordingly, with the rotation of the first valve rod 11, the second valve rod 9 moves up and down. Therefore, as shown in FIG. 3, by raising the second valve rod 9, the valve element 1 is raised, and the inflow conduit 5 and the branch conduit 4 can be brought into a communicating state. Therefore, water from the lower opening 2A of the valve box 2 can be supplied to the upper opening 2B side, and a fire hydrant can be used by connecting a fire hose 60 or the like to the base 44 instead of the base lid 46. .

As is clear from the above, in the fire hydrant of each of the above embodiments, the valve rod itself also functions as the valve body of the fire hydrant. This valve stem (first valve stem 11) only rotates and does not move up and down, and can be arranged not only inside the valve box 2 but also outside the valve box 2, so that the installation space can be appropriately adjusted, and Adjustment of the displacement is also facilitated. Therefore, the air valve in the valve stem is
The performance equivalent to the displacement of the quick air valve can be exhibited. In addition, the air valve can be one that can exhaust a large amount of gas and also exhibit an intake function.

Further, air and the like that have come out of the air valve exhaust hole are discharged to the outside through the lower portion of the cover 36 for preventing infiltration of sewage and sludge. The cover 36 is formed using an air-permeable or impermeable poly-fiber, so that it is possible to prevent sewage, rainwater, sludge and the like from entering the inside from the outside of the fire hydrant. In addition, the cover 36 can be provided with a check function to prevent external sewage or the like from entering the inside of the fire hydrant.

Further, according to the structure of the present embodiment, the valve cap and the valve stem are attached in place of the valve stem and the valve cover of the conventional underground fire hydrant, so that the underground fire hydrant with the quick air valve of the present invention is provided. Can be changed.

FIG. 4 is a longitudinal sectional view showing another embodiment of the fire hydrant with a quick air valve according to the present invention, and shows a state at the time of rapid exhaust with the valve body 1 closed. Since the fire hydrant of this embodiment is basically the same as that of the first embodiment, the following mainly describes the differences between them.

First, the present embodiment has a configuration in which the first valve stem 11 and the second valve stem 9 of the first embodiment are integrated.
That is, the valve stem 9 (11) of the second embodiment has a substantially cylindrical shape which is elongated in the vertical direction, has a built-in quick air valve in the upper part thereof, and has a male screw part 15 on its lower outer peripheral surface.
Is formed, and a packing 18 is provided at the lower end to constitute the valve body 1.

A flange 17 is formed at the lower end of the valve stem 9 so as to protrude inward and outward in the radial direction of the valve stem 9, and is formed at the lower end of the valve stem 9 by the flange 17 extending radially inward. The opening is slightly narrowed. This, together with the flange 105 that can be appropriately formed on the inner peripheral surface of the valve stem 9, prevents the adverse effects of the water hammer. A packing 18 is arranged on the lower surface of the flange portion 17, and the packing 18 is fixed by a packing retainer 19. When the packing 18 comes into contact with the upper end of the inflow pipe 5, the valve of the fire hydrant is closed. In addition, as the valve stem 9 moves up and down, the communication between the lower opening 2A and the upper opening 2B is adjusted, so that the amount of discharged water can be adjusted.

In this embodiment, a female screw portion 14 is formed at the lower end of the valve lid 7 through which the valve stem 9 is disposed.
A male screw part 15 of the valve rod 9 is screwed to this female screw part 14 of the valve lid 7 so as to be able to advance and retreat. Therefore, by rotating the valve stem 9, the valve stem 9 can be moved up and down with respect to the valve lid 7. In addition, the packing 10 is provided between the inner peripheral surface of the valve stem 9 (the portion where the male screw portion 15 is not formed) on the upper part of the valve lid 7.
The packing 100 is positioned by a packing presser 101 attached to the upper surface of the valve cover 7.
Thereby, the valve stem 9 and the valve cover 7 are attached in an airtight state, and water leakage is prevented.

A flange portion 102 is formed on the upper inner peripheral surface of the valve stem 9 so as to protrude radially inward, and a flange 24 at the upper end of the guide member 20 is held on the upper surface of the flange portion 102.
The guide member 20 is positioned and fixed by a float retainer 23 attached to the upper surface of the flange 24. The structure of the guide member 20 is the same as that of the first embodiment. In the same manner as in the first embodiment, a spherical float valve 21 and its float valve 2
A floating valve body 22 having a substantially disc shape and having a conical valve seat 26 is disposed in the upper part of the floating valve body 1.

A shaft cover 37 is connected to the upper portion of the valve stem 9 so that the valve stem 9 can rotate. Valve stem 9 of the present embodiment
On the peripheral side surface slightly above the float retainer 23, an exhaust hole 35 communicating between the inside and outside of the valve rod 9 is formed. It is needless to say that the way of exhaustion is not limited to the configuration in the illustrated example. For example, the same exhaust as in the first embodiment may be realized by attaching a cover 36 (see FIGS. 1 to 3) as in the first embodiment to the upper part of the valve stem 9.

In each of the above embodiments, the external shape of the conventional single-ported underground fire hydrant can be maintained, that is, the fire hydrant box and the fire hydrant lid can be used as they are. Further, depending on the situation, the valve lid and the valve stem are removed from the valve box and replaced with the main part of the above embodiment to the one where the underground type single-port fire hydrant is currently installed, so that the air valve fire hydrant of the present invention (for rapid use) ). In that case, the function is the same as that of the above embodiment, and there are many advantages such as cost reduction, weight reduction, factory production, on-site workability, construction cost, cost reduction of fire extinguishing box and fire hydrant lid and shortening of construction time. .

The conventional single-port air valve has a large number of parts and is fine and complicated. However, each of the above embodiments is simple, easy to maintain, and in the unlikely event that the valve seat rubber or the like becomes clogged. In the event of a water leak, fire extinguishing activities will not be affected by forced evacuation at the site. Also, since there is basically no seam to the wetted part, water leakage is not usually considered. From these facts, it goes without saying that the cost of the product itself is reduced, assembling is simple in manufacturing, and the total cost can be reduced.

As described above, the fire hydrants of each of the above embodiments have advantages that they are light in weight, low in cost, workability during construction is good, and can be used in common with conventional single-port fire hydrant boxes. In addition, since the valve box can be completely the same as the conventional underground fire hydrant single-port type, in that case, the underground type single-port fire hydrant can be easily replaced with a quick air valve underground hydrant by replacing the valve stem part. become. In this case, it is needless to say that the repair valve is opened and closed to perform replacement.

The fire hydrant with a quick air valve of the present invention
The present invention is not limited to the configuration of each of the above embodiments, but can be changed as appropriate. For example, in each of the above embodiments, an example was described in which the cup-shaped guide member 20 was disposed above the valve rod, and the spherical float valve element (evo ball) 21 and the floating valve element 22 were disposed within the guide member 20. However, the structure of this portion is not limited to that of the above embodiment, and can be changed as appropriate. For example, it can be changed as shown in FIG.

The embodiment shown in FIG. 5 is a modification of the embodiment shown in FIG. Therefore, the following description focuses on the differences between the two. In the case of the embodiment shown in FIG. 5, the guide member 20 is formed of a perforated plate, that is, a flat plate (a disk) having a plurality of small holes 25 formed therethrough. The perforated plate 20 is provided so as to be stretched inside the valve stem 9 so as to partition the valve stem 9 up and down at the center in the longitudinal direction.

Above the perforated plate 20, a float retainer 23 is provided separately from the perforated plate 20. A relatively large-diameter exhaust hole 30 is formed in the center of the float retainer 23 so as to penetrate in the vertical direction. Above the float retainer 23, an exhaust hole 35 penetrating through the inside and outside of the valve rod 9 is formed on the peripheral side wall of the valve rod 9. The region from the perforated plate 20 to the float retainer 23 functions as a region in the cup-shaped guide member in the embodiment of FIG.

A guide rod 111 is set up between the perforated plate 20 and the float holder 23 along the vertical direction.
In the illustrated example, a guide rod 111 is provided slightly to the right of the center. A substantially block-shaped float valve element 21 and a floating valve element 22 are inserted into the guide rod 111.
The float valve element 21 and the floating valve element 22 are respectively connected to the guide rod 1
11 can be moved up and down.

The floating valve element 22 is disposed above the float valve element 21, and has an exhaust hole 3
A bulging portion 113 which can enter into 0 is formed to protrude upward. Further, a small-diameter exhaust hole 27 is formed in the floating valve body 22 so as to penetrate in the up-down direction. The upper opening of the exhaust hole 27 is arranged at a position corresponding to the exhaust hole 30 of the float retainer 23, and is formed slightly to the right from the center in the illustrated example. Further, a valve seat 1 is provided at the lower opening of the exhaust hole 27.
14 are provided.

The upper surface of the float valve element 21 can be brought into contact with the lower opening (toilet seat 114) of the exhaust hole 27 of the floating valve element 21, and the exhaust hole 27 can be opened and closed by this contact condition. With such a configuration, the floating valve body 22 and the float valve body 2
1 is floatable, and is airtightly sealed via an O-ring 112 disposed on the lower surface of the float retainer 23.
Is brought into contact with the float presser 23. In the case of a small amount of exhaust, air enters the gap between the floating valve element 22 and the float valve element 23 and moves the float valve element 23 slightly downward with respect to the floating valve element 22, so that the air is floating. The gas can escape outward through the exhaust hole 27 of the valve body 22, the exhaust hole 30 of the float retainer 23, and the exhaust hole 35 of the valve rod 9.

In the case of a large amount of exhaust, a large amount of air accumulates around the float valve element 21 and the floating valve element 22, so that these members 21 and 22 lose buoyancy and move downward along the guide rod 9. The lowering is performed by opening the exhaust hole 30 of the float retainer 23. It is needless to say that such a structure shown in FIG. 5 is applicable not only to the embodiment of FIG. 4 but also to the embodiments of FIGS.

[0063]

As described above in detail, according to the fire hydrant with a quick air valve of the present invention, a fire hydrant capable of mass discharge with a simple structure can be provided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a fire hydrant with a quick air valve of the present invention, showing a normal state in which a valve body is closed.

FIG. 2 is a longitudinal sectional view of the fire hydrant with a quick air valve of FIG. 1, showing a state at the time of rapid exhaust with a valve body closed.

FIG. 3 is a vertical sectional view of the fire hydrant with a quick air valve of FIG. 1, showing a valve body opened.

FIG. 4 is a longitudinal sectional view showing another embodiment of a fire hydrant with a quick air valve according to the present invention, showing a state at the time of rapid exhaust with a valve body closed.

5 is a longitudinal sectional view showing a modification of the fire hydrant with a quick air valve of FIG. 4;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 valve body 2 valve box 2A lower opening 2B upper opening 7 valve lid 9 second valve rod 11 first valve rod 18 packing 20 guide member 21 float valve element 22 floating valve element 23 float presser 25 communication hole 27,29 exhaust hole 30 Exhaust hole 35 Exhaust hole 36 Cover 38 Lower opening 40 Gate 41 Closed float

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2E189 EA01 3H052 AA01 BA25 CA12 CC01 CD09 EA02 EA16 3H055 AA04 AA05 AA23 BA04 BA12 BB14 BC01 CC03 CC06 CC11 CC15 GG04 GG22 JJ02 JJ03 JJ08 JJ17 3H06 GG03 GG03

Claims (6)

[Claims] 1. A valve box having a lower opening on a water supply side and an upper opening on a drainage side, and a valve box provided at an upper portion facing the lower opening, and provided so as to be rotatable with respect to the valve cover and immovable up and down. A cylindrical first valve stem, a cylindrical second valve stem which is screwed forward and backward with respect to the first valve stem, and which is provided so as to be non-rotatable and vertically movable with respect to the valve cover; and a second valve stem. A valve body provided in the outer periphery of the distal end of the valve and opening and closing the communication from the lower opening to the upper opening of the valve box as the second valve stem moves up and down; A guide member having a communication hole formed therein, a float valve body housed in the guide member, and provided to be movable up and down according to the amount of water in the guide member by floating on the water, and disposed above the float valve body. It is housed in the guide member in a state where it has been moved, and can move up and down with the float valve body, and exhausts air that has entered the guide member to the outside. The exhaust hole is formed to be openable and closable by a float valve body, and the air can be exhausted to the outside through the communication hole by descending below the communication hole at the upper side of the guide member. A fire hydrant with a quick air valve, comprising a floating valve body. 2. A valve box having a lower opening on a water supply side and an upper opening on a drainage side, and a valve box provided with a valve lid at an upper part facing the lower opening, and is screwed to the valve lid so as to be able to move up and down in a vertical direction. A cylindrical valve stem, a valve body provided on the outer periphery of the distal end of the valve stem, and opening and closing the communication from the lower opening to the upper opening of the valve box as the valve stem moves up and down; A guide member provided with a communication hole in a lower end portion and a side surface, a float valve body provided in the guide member and provided to be vertically movable in accordance with the amount of water in the guide member by floating on water, An exhaust hole which is accommodated in the guide member in a state where it is arranged above the float valve body, can move up and down with the float valve body, and exhausts air entering the guide member to the outside is formed. The hole can be opened and closed by the float valve, and it is lowered below the communication hole on the upper side of the guide member. With rapid air valve hydrant via the communication hole by which anda evacuable floating valve body outward air. 3. The guide member has a substantially cylindrical shape opened upward, and a lower surface thereof is formed so as to bulge downward substantially in a spherical shape.
A communication hole is opened in a side surface which is the upper and lower positions in a state where the floating valve element is lowered most, and a center portion of the lower surface, the float valve element is formed substantially spherical, and the floating valve element is a guide. It has a substantially disk shape slightly smaller in diameter than the inner diameter of the member, and has an exhaust hole that penetrates in the vertical direction at the center and prevents the floating valve body from falling off the guide member at the top of the guide member. 3. An exhaust hole for exhausting air from an idle valve body or a guide member outwardly is formed at a central portion of the float retainer. A fire hydrant with a quick air valve according to the item. 4. A valve box in which a lower opening on the water supply side and an upper opening on the drain side are formed, and a valve cover is provided on an upper portion facing the lower opening, and is provided so as to be rotatable with respect to the valve cover and unable to move up and down. A cylindrical first valve stem, a cylindrical second valve stem which is screwed forward and backward with respect to the first valve stem, and which is provided so as to be non-rotatable and vertically movable with respect to the valve cover; and a second valve stem. A valve body provided on the outer periphery of the tip of the valve for opening and closing the communication from the lower opening to the upper opening of the valve box as the second valve stem moves up and down, and provided in the first valve stem to float on water And a float valve body provided so as to be able to move up and down according to the amount of water, and an exhaust hole which is arranged at the upper part of the float valve body and which can move up and down with the float valve body and exhausts air outward is formed. This exhaust hole is provided in the first valve rod, which can be opened and closed by the float valve body, and is provided in the first valve rod so that the floating valve body is in an airtight state. A fire hydrant equipped with a quick air valve, comprising: a float retainer that is in contact with the floating valve body and is lowered downward together with the float valve body to open a large amount of exhaust hole for exhausting air outward. 5. A valve box having a lower opening on the water supply side and an upper opening on the drain side, and a valve box provided with a valve lid on the upper side facing the lower opening, and screwed into the valve lid so as to be able to move up and down in the vertical direction. A cylindrical valve stem, a valve body provided on the outer periphery of the distal end of the valve stem, and opening and closing the communication from the lower opening to the upper opening of the valve box as the valve stem moves up and down; A float valve body that is provided and can be moved up and down according to the amount of water by floating on the water, and is disposed above the float valve body and can move up and down with the float valve body, exhausting air to the outside A floating valve body having an exhaust hole formed therein, the exhaust hole being openable and closable by a float valve body, and a floating valve body provided in a valve rod, in which the floating valve body is brought into airtight contact and the floating valve body floats. By moving downward together with the valve body, a flow opening a large exhaust hole for exhausting air to the outside. With rapid air valve hydrants, characterized in that it comprises a preparative presser. 6. The exhaust from the float retainer is performed through a cover opened at a lower end portion, and a closed float is provided in the cover so as to be movable up and down according to the amount of water in the cover by floating on the water. The gate provided on the cover is provided between the exhaust hole side of the float retainer and the lower opening of the cover, and can be closed by raising the closing float. The fire hydrant with a rapid air valve according to any one of the above.