JPH09308703A - Fire hydrant device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fire hydrant device having good operability and safety. SOLUTION: This hydrant device used for fire extinguishing in a tunnel and so on is composed of a housing 1, a door 2 attached to it 90 deg. rotatably in the front tilting direction, a hydrant 3 attached to the housing 1, to which a water supply source is connected, a main valve 4, a fixed flow valve 5, a rotatable joint 6, a connection pipe 7, a rotating table 8, a rotatable reel 9, a 30-m long hose 10 connected to the connection pipe 7 and wound around the reel 9, and a nozzle 11 combined with the head end of the hose 10. By the fixed flow valve 5, even when the primary pressure in the upstream of the valve 5 is changed or the secondary pressure in the downstream thereof is changed due to the difference of hose resistance because of the difference in the length of the hose 10 wound out, the flow is fixed constantly to make the pressure immediately before the nozzle 11 is order to improve the operability and ensure superior safety.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a main valve, a hose of a predetermined length wound around a reel, and a nozzle attached to the tip of the hose, which sequentially rotates a reel from the supply side of a fire extinguishing liquid. The present invention relates to a fire hydrant device capable of pulling out the hose.

[0002]

2. Description of the Related Art For example, in a fire hydrant device installed in a tunnel, since the primary pressure of water for fire extinguishing supplied differs depending on the installation location, a manual valve is provided and the nozzle part has a pressure of, for example, about 3 kgf / cm ^2. A person had previously adjusted the opening degree of the manual valve so as to obtain an appropriate pressure. However, depending on the number of adjacent fire hydrant devices used at the time of a fire, the primary pressure of the fire extinguishing water supplied to each fire hydrant device may change significantly, and with such manual adjustment alone, the pressure at the nozzle may significantly increase. There was a problem of fluctuation.

To solve this problem, a fire hydrant device has been proposed in which an automatic pressure regulating valve is provided between the main valve and the hose (see Japanese Patent Laid-Open No. 2-95384). According to this device, even if the primary pressure on the supply side fluctuates, it is possible to control so that the outlet pressure, that is, the pressure at the inlet of the hose becomes substantially constant.

However, in the fire hydrant device in the tunnel, since the hose is wound around the reel, the pressure loss of the water flowing through the hose is considerably different when the hose is wound and when it is pulled out. For example, when the hose length of a normal fire hydrant in a tunnel is 30 m, the difference in pressure loss is about 0.5 kgf / cm ² . Therefore, even if the pressure at the hose inlet is adjusted, the unwinding length of the hose is different when the fire extinguishing place is near and far, and therefore the pressure of the nozzle portion is considerably different. for that reason,
When the hose inlet pressure is set in consideration of the maximum pressure difference, the pressure at the nozzle portion becomes high and the nozzle operation becomes difficult and dangerous when the extinguishing place is far and the hose is unwound for a long time to reduce the resistance. On the other hand, if the hose inlet pressure is set in anticipation of the minimum pressure difference, if the fire extinguishing place is near and the hose is wound around the reel and there is a lot of resistance, the nozzle pressure will be low and the water discharge will be insufficient. There is a problem of doing.

Further, if an ordinary commercially available pressure reducing valve is used in the above-mentioned device, the fluctuation of the primary pressure causes
The secondary pressure also fluctuates by about 0.5 kgf / cm ² . In that case, this pressure fluctuation is also added together with the above-mentioned resistance difference of the hose, and the pressure of the nozzle part will further fluctuate,
The operational risks and the lack of water are further increased.

On the other hand, as an automatic pressure regulating valve for the above-mentioned fire hydrant device, there has been proposed one in which two valve bodies are provided so that the pressure can be accurately adjusted by balancing the fluid force acting on the stem. (See Kaihei 2-97785). However, since this automatic pressure regulating valve has a complicated structure and is made up of an extremely large number of parts, it is necessary to repair it frequently. Therefore, it is not suitable as a part of a fire hydrant device installed in a place where maintenance is difficult, such as a fire hydrant device in a tunnel.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above problems in the prior art, has good operability, high safety, and can always obtain the amount of liquid required for fire extinguishing, and needs repair or the like. An object is to provide a reduced fire hydrant device.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention according to claim 1 is such that a main valve and a hose of a predetermined length wound around a reel are successively arranged from a supply side of a fire extinguishing liquid. And a nozzle attached to the tip of the hose so that the hose can be pulled out by rotating the reel, and in the fire hydrant device, the flow control valve that makes the flow rate of the fire extinguishing liquid flowing through the hose substantially constant is the main valve. And the hose.

According to a second aspect of the present invention, in addition to the above, the flow control valve is provided with a main body having a constant inner cross-sectional area and an orifice-like portion at the upstream end along the inner side of the main body. A moving member that is movably disposed, a spring that urges the moving member in the direction from the downstream side to the upstream side, and the opening that faces the opening of the orifice-shaped portion on the downstream side of the orifice-shaped portion. And a fixing member fixed at a distance from the fixing member.

The invention of claim 3 is characterized in that the fire hydrant device is used for extinguishing a fire in a tunnel.

According to a fourth aspect of the present invention, in addition to the features of the second aspect, the flow control valve controls the flow rate of the extinguishing liquid flowing through the hose in a predetermined pressure range including the pressure of the extinguishing liquid supplied. It is characterized by making the flow rate almost constant.

[0012]

1 shows an example of a fire hydrant device to which the present invention is applied. (A) shows a front surface of a state in which a forward tilting door is opened, and (b) shows a plane surface thereof. The fire hydrant device is used for extinguishing a fire in a tunnel, and includes a housing 1, a forward tilting door 2 attached to the housing 1 so as to be rotatable 90 ° in a forward tilting direction,
A water tap 3, a main valve 4, a constant flow valve 5, a rotary joint portion 6, a connecting pipe 7, a rotary base 8, a rotatable reel 9, which is attached to the housing 1 and to which a water source for extinguishing liquid is connected by piping. As shown by the intersection of the alternate long and short dash lines in the figure, a hose 10 connected to the connecting pipe 7 and wound around the reel 9 for a predetermined length of, for example, 30 m, a nozzle 11 connected to the tip of the hose 10, and the like are provided.

FIG. 2 shows an example of the structure of the constant flow valve 5. The constant flow rate valve 5 is a flow rate control valve that is provided between the main valve 4 and the hose 10 via the connecting pipe 7 and the like as described above, and that makes the flow rate of the fire-fighting water flowing through the hose 10 substantially constant. A body 51 as a main body, a piston 52 as a moving member,
Spring 53, 54, needle 55 as a fixing member, spring holder 56, sleeve 57, stop rings 58, 59
And so on.

The body 51 has a very simple structure having a constant inner cross-sectional area. In this example, the mounting flange portion 5 is used.
It is formed of a cylindrical tube provided with 1a. Piston 52
Is an opening crown portion 52a as an orifice-shaped portion at the upstream end portion of the water on the left side in the figure and a skirt portion 5 for allowing the piston 52 to move along the inside of the body 51.
2b. In this example, the skirt portion 52b is slidably moved with the sleeve 57, and wear of the inner surface of the body is prevented.

The spring biases the piston 52 in the direction from the downstream side to the upstream side. In this example, two springs 53 and 54 are provided. Then, the spring 53 controls a large pressure difference range and the spring 54 controls a small pressure difference range, thereby improving the controllability of the flow rate in a wide pressure difference range.

The needle 55 includes a needle valve portion 55a and a boss portion 55b integrally formed as a holder, and a connecting portion 5.
5c and a fitting ring portion 55d, the fitting ring portion 55d is fixed in the body 51 by being fitted in the sleeve 57. Needle valve part 5
5a is screwed into the boss portion 55b of the holder and is arranged at a distance from the opening so as to face the opening on the downstream side of the opening crown portion 52a of the piston 52, and between the opening and the opening. It forms a water flow path.

With such a structure, the opening crown portion 52a of the piston 52 acts as an orifice and generates a differential pressure across the piston in accordance with the flow rate of water. By this pressure difference,
The piston 52 is pushed from the upstream side where the pressure is large to the downstream side where the pressure is small, and the displacement caused thereby compresses the springs 53 and 54 to generate a spring force, whereby the force due to the pressure difference and the spring force are balanced. The position of the piston is set.
Since the position of the needle 55 is constant, the position of such a piston determines the flow passage area of the water formed by the opening and the needle valve portion 55a. On the other hand, the flow rate of water is proportional to the flow passage area and also to the 1/2 power of the differential pressure. As a result, the needle valve portion 55a is shaped so as to change the flow passage area so that the flow rate becomes constant when the piston position changes due to the change in the differential pressure.

From such a relationship, when a predetermined flow rate is flowing under a predetermined pressure condition and the primary pressure, which is the upstream pressure, increases, the differential pressure of the opening crown portion 52a increases, This retreats to the downstream side, the gap with the needle valve portion 55a becomes narrower, and the flow passage area becomes smaller. Due to such a correlated change, a flow rate almost the same as that before the change eventually flows. The constant flow valve 5 as shown in FIG. 2 has an extremely small number of parts, has a simple structure, and is unlikely to cause a failure.

FIG. 3 shows an example of actual measurement of the flow rate characteristics of such a constant flow rate valve 5. This constant flow valve is a valve designed to have a constant flow rate of 130 liters / minute and a working differential pressure range of 0.3 to 10 kgf / cm ² . As shown in the figure, in the operating differential pressure range, flow rate fluctuations due to changes in differential pressure are almost 10% or less (10 kgf / cm ²
It is in the range of 20% or less even in the vicinity, which is almost constant. Therefore, for example, if the target secondary pressure, which is the pre-nozzle pressure, is 3 kgf / cm ² , this valve has a predetermined pressure range of 3.3 to 13 kgf / cm ^{2 for} an extremely wide range of primary pressure. It can be used at an almost constant flow rate. Therefore, the constant flow valve of this example has a very wide range of application.

As described above, according to such a constant flow valve 5, even if the pressure on the primary side or the secondary side changes, if the differential pressure is within a certain range, the constant flow rate is almost as planned. Can be drained. As a result, the nozzle 11 to be used has, for example, a predetermined water amount of 130 liters / at a predetermined pressure of 3 kgf / cm ² .
As long as it has a specification that allows water to be discharged, by using a constant flow valve with a specification of a flow rate of 130 liters / minute, even if the differential pressure changes, the amount of water can be almost maintained. As a result, when the unwinding length of the hose from the reel 9 is different, or when the drawn hose has a bent portion, the flow resistance of the water on the secondary side changes and the differential pressure of the constant flow valve changes. However, the pressure at the nozzle inlet is maintained at the predetermined pressure. Then, good operability and safety of the nozzle can be ensured.

FIG. 4 shows the results of a water discharge test performed by the fire hydrant apparatus of the present invention equipped with the constant flow valve shown in FIG. In this test, using a constant flow valve of the specification and performance as shown in FIG. 3, the primary pressure ^{16kgf / cm 2, 10kgf / cm} 2 and 5 kgf /
There are 3 types of cm ² and the hose 9 is pulled out completely and the pullout length is 0, and the pullout length is 10 m.
1 and the withdrawal length of 30 m, and as shown in FIGS. 1 and 2, there are three positions of the inlet P _{1 of the} main valve 4, the outlet P ₂ of the constant flow valve 5 and the inlet P ₃ of the nozzle 11. Was measured. Sign of pressure measurement position, for example, P ₃₀ m,
P ₃ 10 m, P ₃ 30 m, respectively, drawer length of the hose 9 is 0 m, 10 m, 30 m nozzle inlet P when the
The pressure of ₃ is shown.

From these test results, it was verified that the pressure becomes almost constant with respect to the difference in the withdrawal length of the hose 9 at any primary pressure and at any measurement position including in front of the nozzle. . Therefore, the fire hydrant device of the present invention has good operability and extremely high safety. Note that when the primary pressure is 16 kgf / cm ^2, the predetermined pressure nozzle pressure before They become about 4kgf / cm ² 3kgf / cm
It is higher than ² because the differential pressure due to this primary pressure exceeds the specified differential pressure of the constant flow valve used in the test.
Therefore, in the case of the fire hydrant device used with such a high differential pressure, the pressure before the nozzle can be set to the predetermined pressure of 3 kgf / cm ² by using the constant flow valve of the specification with a larger differential pressure.

In the constant flow rate valve as described above, the differential pressure range and flow rate condition to be used are determined, and as long as the size and shape of each part designed for them are determined, almost the same performance is obtained for all valves. Is obtained. Therefore, in the constant flow valve adopted in the present invention, like the pressure adjusting valve of the prior art, the secondary pressure is adjusted for each manufactured valve, and it is troublesome that the target pressure is set. A simple adjustment test is unnecessary and the manufacturing process is simplified.

Although the fire hydrant device has been described as being installed in a tunnel having a hose of about 30 m in length, the present invention is directed to a fire hydrant device in which a hose of a certain length is unitized. It is widely used and exhibits its effects.

[0025]

As described above, according to the present invention, in the first aspect of the invention, since the flow control valve for making the flow rate of the fire extinguishing liquid flowing through the hose substantially constant is provided between the main valve and the hose, Even if the primary pressure of the fire-extinguishing liquid changes or the secondary pressure on the downstream side of the flow control valve changes due to a difference in the length of the hose withdrawal or the like, a substantially constant flow rate can always be maintained. As a result, the inlet pressure of the nozzle, which becomes a constant pressure when discharging water at a constant flow rate, can be made substantially constant, which facilitates nozzle operation and ensures work safety.

In the invention of claim 2, in addition to the above, the main part of the flow control valve is constituted by the main body part, the moving member, the spring and the fixed member, so the number of constituent parts is extremely small, and most of the repairs are performed. Eliminates the need for. As a result, it is possible to improve the operability and safety of the fire hydrant device and contribute to achieving maintenance-free operation.

According to the third aspect of the present invention, since the fire hydrant device is used for extinguishing a fire in a tunnel, when the fire is extinguished by using a plurality of fire hydrant devices arranged at regular intervals in the tunnel, the length of the hose pulled out. Will be different,
The above-mentioned effect of improving operability and safety becomes more effective.
Further, in the tunnel, the fire hydrant device is required to be maintenance-free due to difficulty in traffic regulation and the like, so that the effect of using the flow control valve having a simple structure in which failure is extremely unlikely to occur is more effective.

In the fourth aspect of the invention, the flow rate control valve makes the flow rate of the fire-extinguishing liquid flowing through the hose substantially constant in a predetermined pressure range including the pressure of the supplied fire-extinguishing liquid, so that the primary pressure is in a wide range. A flow control valve and a fire hydrant equipped with it can be applied to. As a result, mass productivity of the fire hydrant device is improved.

[Brief description of drawings]

FIG. 1 is a schematic view of a fire hydrant device to which the present invention is applied, showing a state in which a forward tilting door is opened, (a) is a front view and (b) is a plan view.

FIG. 2 is a sectional view showing an example of a constant flow valve mounted on the fire hydrant device.

FIG. 3 is a curve diagram showing an example of performance of a constant flow valve.

FIG. 4 is a curve diagram showing a result of a water discharge test using the constant flow valve.

[Explanation of symbols]

 4 main valve 5 constant flow valve (flow control valve) 9 reel 10 hose 11 nozzle 51 body (main body) 52 piston (moving member) 52a opening crown portion (orifice-like portion) 53, 54 spring 55 needle (fixing member)

Claims (4)

[Claims] 1. A main valve, in order from the supply side of the fire extinguishing liquid,
In a fire hydrant device having a hose of a predetermined length wound on a reel and a nozzle attached to the tip of the hose so that the hose can be pulled out by rotating the reel, the flow rate of the fire-extinguishing liquid flowing through the hose is almost the same. A fire hydrant device, characterized in that a constant flow rate control valve is provided between the main valve and the hose. 2. The flow control valve includes a main body having a constant inner cross-sectional area, and a moving member provided with an orifice portion at an upstream end so as to be movable along the inner side of the main body. A spring that biases the moving member in the direction from the downstream side to the upstream side, and a fixed member that is fixed at a distance from the opening so as to face the opening of the orifice-shaped portion on the downstream side of the orifice-shaped portion. The fire hydrant device according to claim 1, further comprising a member. 3. The fire hydrant device according to claim 2, which is used for extinguishing a fire in a tunnel. 4. The flow control valve makes the flow rate of the fire-extinguishing liquid flowing through the hose substantially constant in a predetermined pressure range including the pressure of the fire-extinguishing liquid supplied. Fire hydrant device.