JPH0538143Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention proposes an anti-freeze discharge valve equipment that can be realized at low cost using non-electrical control, regarding anti-freezing discharge valve equipment used in fire extinguishing equipment. be.

(Prior art) The fire extinguishing equipment _whose piping schematic diagram is illustrated in FIG. It is pressurized as water, and a fire extinguishing pump is used in the event of a fire.
It has a structure that sends high-pressure water by P ₂ to the fire hydrant 2.

Conventionally, as antifreeze equipment in the cold season, an electric discharge valve 5 that is opened and closed by a motor M is connected to the branch pipe 4 of the main water supply pipe 1 to operate a temperature sensor S that detects the outside air temperature, and to extinguish the water. pump for
Depending on the presence or absence of _P2 operation, motor M rotates forward or
A control panel 6 is provided for instructing reverse direction drive.

That is, when the temperature is low and there is a risk of freezing, the motor M is rotated in the direction in which the electric discharge valve 5 is opened based on the detection output of the temperature sensor S, and the flow rate from the branch pipe 4 is adjusted appropriately (when no freezing occurs). When the fire extinguishing pump P 2 is operated, the electric discharge valve 5 is used to discharge water from the discharge port 7 (the flow rate for water flowing inside the water supply main 1), and even when the outside temperature is normal or low temperature, the fire pump P ₂ is operated. The control panel 6 is configured to control the rotation of the motor M in the closing direction, so that fire extinguishing water is used without waste according to each of the above situations.

(Problems to be Solved by the Invention) The conventional discharge valve equipment described above requires wiring cables for controlling the temperature sensor S and the motor M, which increases the cost of laying the cables.

Further, the electric discharge valve 5 is housed in the pit 28, but the temperature sensor S and the control panel 6 are housed in the pit 28.
It is inconvenient to inspect and test the discharge valve equipment because it is located far away from the valve.

This invention eliminates the need for such wiring cables,
The purpose of the present invention is to propose an improved anti-freeze discharge valve equipment that consolidates the discharge valve equipment in one place and facilitates maintenance.

(Means for solving the problem) The structure of this invention to achieve the above purpose is as follows:
A valve chamber 18 having a water supply side chamber 16 communicating with the water supply main 1 to which a fire extinguishing device such as a fire hydrant 2 is connected, and a discharge side chamber 17 communicating with the discharge port 7, and the priming water pressure in the water supply main 1. An automatic on-off valve 9 including an on-off valve body 20 that shuts off the two chambers 16 and 17 and opens the two chambers 16 and 17 when the cylinder chamber 22 is pressurized; The branch pipe 4 from the main water supply pipe 1 is provided with a mechanically operated control valve 15 which functions to open only when the main water supply pipe 1 is under priming pressure and the outside air is low temperature.

The control valve 15 is connected to a regulating valve 26 which is opened under priming pressure and closed by high water pressure in the water supply main 1 when the fire pump _P2 is in operation, and a regulating valve 26 which is opened when the outside air temperature is low;
It can be configured with a low-temperature operation valve 27 that closes when the outside temperature is normal, and the equipment cost can be reduced.

(Function) When the fire pump P ₂ is not operating and the outside temperature is normal, the control valve 15 closes the branch waterway 4, so the cylinder chamber 22 becomes unpressurized, and the priming water pressure in the water supply main 1 is applied. The opening/closing valve body 20 is connected to the water supply side chamber 1.
6 and the discharge side chamber 17 are blocked, and discharge is not performed.

When the outside air becomes low temperature under normal conditions, the control valve 15 opens the branch waterway 4, the cylinder chamber 22 is pressurized, the on-off valve body 20 opens between the water supply side chamber 16 and the water discharge side chamber 17, and the water supply main The fire extinguishing water No. 1 is discharged from the automatic on-off valve 9 to the outlet 7 to prevent the main water supply pipe 1 and the like from freezing.

When the fire pump P ₂ is activated when the outside temperature is normal or low temperature, the control valve 15 closes and the cylinder chamber 22 becomes pressureless, and the on-off valve body 20 connects the water supply side chamber 16 and the discharge side chamber. 17, no water is discharged, and all the fire extinguishing water in the main water supply pipe 1 is effectively used for extinguishing fires.

Since both the automatic opening/closing valve 9 and the control valve 15 operate mechanically and do not require a power source, there is no need to lay wiring cables, and the automatic opening/closing valve 9 and the control valve 15 can be installed in one place. Can be done.

The control valve 15 is controlled by a regulating valve 26 that is opened under priming water pressure and closed by high water pressure generated by the operation of the fire pump P ₂ , and a low-temperature operating valve 27 that is opened when the outside air temperature is low and closed when the outside air temperature is normal. Therefore, both the regulating valve 26 and the low-temperature operation valve 27 can be formed from simple structures, for example, ready-made products.

(Example) Next, an embodiment of this invention will be explained based on the drawings.

Fig. 1 shows a schematic diagram of the piping of the fire extinguishing equipment, and Fig. 2 shows an external view of the main parts of the water discharge valve equipment.

A discharge port 7 is connected to a branch pipe 4 branched from the main water supply pipe 1 via a gate valve 8, a strainer 10, an automatic on-off valve 9, and a flow rate adjustment valve 11. Water pipe 12, gate valve 13
The strainer 14 and the control valve 15 are connected, and the outlet side of the control valve 15 is connected to the automatic opening/closing valve 9 as described below.
Connect to.

3 to 6 schematically illustrate the operating states of the automatic on-off valve 9 and the control valve 15 in specific examples.

The illustrated automatic opening/closing valve 9 has a valve chamber 18 that includes a water supply side chamber 16 that communicates with the water supply main pipe 1 via the branch pipe 4 and a discharge side chamber 17 that communicates with the discharge port 7.
and an on-off valve body 20 provided to open or shut off the valve port 19 that communicates between the water supply side chamber 16 and the water discharge side chamber 17, and the on-off valve body 20 is biased in the direction in which the valve port 19 is blocked Valve spring 21 and water discharge side chamber 17
The control valve 15 is integrally provided in the valve chamber 18 near the
and a piston 23 that pushes the on-off valve body 20 toward the opening side of the valve port 19 when pressurized by fire extinguishing water flowing into the cylinder chamber 22.
The cylinder chamber 22 communicates with a drain port 25 via an orifice 24.

The illustrated control valve 15 opens its valve port under the priming pressure generated by the pressurized water supply pump P ₁ during normal times (in the event of a non-fire), and the water supply main is opened by the operation of the fire extinguishing pump P ₂ . A regulating valve 26 has a function of closing the above-mentioned valve port by the action of high water pressure generated in the 1, and a function of opening the valve port when the outside temperature is low and closing the above-mentioned valve hole when the temperature exceeds the low temperature and reaches room temperature. It consists of a low temperature operating valve 27.

The operation of the antifreeze discharge equipment configured as described above will be explained.

Under normal conditions, when the outside temperature is normal, as shown in Figure 3,
The low-temperature operation valve 27 closes and the cylinder chamber 22 becomes pressureless, and the fire extinguishing water in the main water supply pipe 1 enters the water supply side chamber 16 of the automatic on-off valve 9 from the branch pipe 4, and the pressure of this fire extinguishing water, that is, the priming water pressure. The opening/closing valve body 20 is pressed against the valve seat by the valve spring 21 and the valve port 19 is closed, so that no water is discharged from the discharge port 7.

Further, under such priming pressure, the regulating valve 26 is open, but the low temperature operation valve 27 is closed, so as described above, the cylinder chamber 22 becomes pressureless.

In FIGS. 3 to 6, water passage points are indicated by black dots.

In normal times, when the outside air is low temperature, both the regulating valve 26 and the low-temperature operation valve 27 are opened, as shown in FIG.
6, 27 to the cylinder chamber 22 of the automatic on-off valve 9.
act within.

Due to the priming pressure in the cylinder chamber 22, the piston 2
3 is pushed and pushes the opening/closing valve body 20 against the priming pressure in the water supply side chamber 16 and the valve spring 21, and the valve port 19 is opened.

The water supply side chamber 19 communicates with the discharge side chamber 17 through the opened valve port 19, and the fire extinguishing water in the water supply main pipe 1 is discharged to the outside from the discharge port 7, and this water flow causes the water supply main pipe 1, etc. Freeze protection is provided.

The extinguishing water in the cylinder chamber 22 is also discharged to the outside from the drain port 25 while the outflow amount is regulated by the orifice 24 without interfering with the above-mentioned pushing action of the piston 23 so as not to freeze.

When the outside temperature rises from the low temperature state shown in FIG. 4 and returns to normal temperature, the low temperature operation valve 27 closes and the priming pressure from the water pipe 12 to the cylinder chamber 22 is reduced as shown in FIG. The extinguishing water remaining in the cylinder chamber 22 is continuously discharged from the drain port 25 via the orifice 24.

When the pressure in the cylinder chamber 22 is reduced in this way, the opening/closing valve body 21 is pressed against the valve seat by the valve spring 21 and the priming pressure in the water supply side chamber 16, and the valve port 19 is closed and the discharge is stopped. Then, the state returns to the state shown in FIG.

Fire extinguishing pump during discharge at low temperature as shown in Figure 4
When P ₂ starts operating, this operation generates high water pressure in the water main 1, as shown in Figure 6.
The high water pressure acting through the water conduit 12 causes the regulating valve 26 to close.

By closing the regulating valve 26, pressurization of the cylinder chamber 22 is stopped, and the remaining water in the cylinder chamber 22 is drained from the drain port 25 via the orifice 24.

When the pressure inside the cylinder chamber 22 is reduced, the valve spring 21
The on-off valve body 20 is pressed against the valve seat by the high water pressure acting on the water supply side chamber 16, the valve port 19 is closed, and the discharge is stopped.

Although not shown, even if the fire extinguishing pump P ₂ starts operating when the outside air temperature is normal as shown in FIG. Since the cylinder chamber 22 is closed by high water pressure, the cylinder chamber 22 remains unpressurized, the automatic opening/closing valve 9 continues to close, and no discharge occurs.

As mentioned above, when firefighting is not being carried out and the outside air is low temperature, the automatic on-off valve 9 opens and water is discharged.
The water supply main 1, etc., is prevented from freezing, but when the fire pump _P2 starts operating, the automatic on-off valve 9 is closed to stop water discharge, so that fire extinguishing water can be used without wasting it.

The automatic opening/closing valve 9, the regulating valve 26, and
Both low-temperature operation valves 27 have a mechanically operated structure and do not require a power source, so there is no need for wiring cables for this discharge valve equipment. Even if the equipment is concentrated in the pit 28, there is no need for earth leakage countermeasures, the equipment space can be reduced, and the consolidation makes maintenance easier.

A specific example of the piping connection between the regulating valve 26 and the low-temperature operating valve 27 is as shown in FIG.
It may be on the side closer to 2.

The control valve 15 is a regulating valve 26 having the above functions.
and the low temperature operation valve 27.

In the above embodiment, a bypass pipe 29 that can bypass the automatic on-off valve 10 and a gate valve 30 that closes the bypass pipe 29 are provided.

Furthermore, although the above embodiments have been described using a fire hydrant as an example, other fire extinguishing equipment may be used instead of a fire hydrant, in which a water discharge nozzle is provided through an automatic valve or an on-off valve.

(Effect of the invention) As mentioned above, the anti-freezing discharge valve equipment according to this invention includes an automatic opening/closing valve 9 for discharging fire extinguishing water from the water supply main 1, and an automatic opening/closing valve 9 for discharging fire extinguishing water from the water supply main 1. A control valve 15 that controls the opening and closing of the automatic opening/closing valve 9
Since it is configured to operate mechanically, there is no need for a control power source, and equipment costs such as laying wiring cables can be eliminated.

Furthermore, even if the automatic opening/closing valve 9, control valve 15, etc. are consolidated and housed in the pit 28, for example, there is no risk of problems such as electrical leakage, and this saves equipment space. Maintenance becomes convenient.

The control valve 15 is opened under priming water pressure and closed by the high water pressure in the water supply main 1 when the fire pump P ₂ is in operation, and the low-temperature operation valve 26 is opened when the outside air temperature is low and closed when the outside air temperature is normal. The adjustment valve 26 and the low-temperature operation valve 27
Both of the above can be satisfied with simple structures, for example, ready-made products, and the control valve 15 can be constructed at low cost.

[Brief explanation of the drawing]

Figures 1 to 7 show examples of this invention, Figure 2 is a schematic piping diagram of the fire extinguishing equipment, Figure 2 is an external view of the main parts of the water discharge valve equipment in Figure 1, and Figures 3 to 7 are 6 to 6 are schematic diagrams showing the operating states of the automatic on-off valve and the control valve, FIG. 7 is a schematic diagram of the operating state in another embodiment, and FIG. 8 is a schematic diagram of the piping of conventional equipment. 1... Main water supply pipe, 2... Fire hydrant, 3... Water supply source, 4... Branch pipe, 5... Electric discharge valve, 6...
Control panel, 7...Discharge port, 8, 13, 30...Gate valve, 9...Automatic opening/closing valve, 10, 14...Strainer, 11...Flow rate adjustment valve, 12...Water pipe, 15
... Control valve, 16 ... Water supply side chamber, 17 ... Discharge side chamber, 18 ... Valve chamber, 19 ... Valve port, 20 ... Opening/closing valve body, 21 ... Valve spring, 22 ... Cylinder chamber, 2
3... Piston, 24... Orifice, 25...
Drain port, 26...Adjusting valve, 27...Low temperature operation valve,
28... Pit, 29... Bypass pipe, 30...
Gate valve, P ₁ ... Pressurized water supply pump, P ₂ ... Fire extinguishing pump, S ... Temperature sensor, M ... Motor.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A valve chamber that has a water supply side chamber that communicates with a water supply main to which a fire extinguishing device such as a fire hydrant is connected, and a discharge side chamber that communicates with an outlet; The automatic on-off valve is equipped with an on-off valve body that shuts off the two chambers and opens the two chambers when the cylinder chamber is pressurized, and the branch pipe from the main water supply pipe is connected to the water supply Freeze prevention discharge valve equipment that has a mechanically operated control valve that functions to open only when the main pipe is under priming pressure and the outside air is low temperature. 2 The above control valve consists of a regulating valve that opens under priming water pressure and closes due to high water pressure in the water supply main when the fire pump is operating, and a low-temperature operating valve that opens when the outside air is low and closes when the outside air is normal temperature. The antifreeze discharge valve equipment according to claim 1.