JPS629887Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fire extinguishing system for high-rise buildings, etc., in which extinguishing water is supplied under pressure by a pump and sprayed from a fire extinguishing bed in the event of a fire.

Regarding this type of fire extinguishing equipment, conventionally known as sprinkler fire extinguishing equipment, it is legally regulated that measures must be taken to ensure that the water discharge pressure at the sprinkler head does not exceed 10 kg/cm2, and specific measures for this purpose are required. Currently, the use of pressure reducing valves is permitted. However, the installation of pressure reducing valves is limited to the third floor above the floor where the pump is installed, in order to prevent as much as possible the water supply to the sprinkler head from being stopped in the event of a fire due to a failure of the pressure reducing valve.

By the way, for example, when installing fire extinguishing equipment in a high-rise building with 18 floors above ground and 3 floors underground as shown in Figure 1, a pressurized water supply system with a fire pump 1 is installed on the 3rd floor underground, and the pump is installed on the 3rd floor from the floor where the pump is installed. Since a pressure reducing valve 2 can be installed for up to the first basement floor, the lift of the fire pump 1 can be adjusted, for example, to provide a water supply pressure of 10 Kgf/cm ² or less for the first floor above ground level.
Set at 110m. However, considering the loss of automatic alarm valves 5 and pipe joint valves installed in the branch pipes 4 of each floor from the main water supply pipe 3, the actual lift of the fire pump 1 is 60~60cm even if the floor where the pressure reducing valve 2 is installed is added. 65m, and as a result, the pressurized water supply capacity is only available up to about the 13th floor above the ground.For this reason, for example, a pressurized water supply system with a separate fire pump 6 is installed on the 14th floor above the ground, and fire pumps 1 and 6 are installed on the 14th floor. The series operation provides pressurized water supply to floors 14 and above. Therefore, in the case of fire extinguishing equipment for high-rise buildings, in addition to the pressurized water supply system of the fire pump 1 installed in the basement, a pressurized water supply system of the fire pump 6 must be installed separately in the middle of the floor.
When installing the fire pump 6, a dedicated pump room must be secured, which limits the usable area of the building, and requires the use of two or more fire pumps, resulting in high equipment costs. Ta.

This invention was developed by focusing on these conventional problems, and involves pressurizing fire extinguishing water using a pump, sending it through the main water supply pipe and branch pipes, and spraying it from the fire extinguishing head connected to the branch pipe. In order to simplify the fire extinguishing equipment in high-rise buildings, etc., by making it possible to supply water under pressure using a high-lift fire pump while maintaining the radiation pressure of the fire extinguishing head below the specified pressure, the radiation pressure exceeds the specified pressure. The purpose is to provide a fire extinguishing system that is not subject to regulations based on the number of floors where pressure reducing valves are installed by providing a primary pressure control means that controls the primary side pressure of automatic alarm valves installed in branch pipes to below the specified pressure. shall be.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 2 is an explanatory diagram showing an embodiment of the present invention.

First, to explain the configuration, numeral 10 is a pump installed on the lowest floor of a high-rise building, etc., which is activated when a fire is detected, pressurizes fire extinguishing water in a fire extinguishing water tank 11, and supplies it to the water main 12. From the water main 12,
A branch pipe 13 is pulled out for each floor, and the pump 1
For branch pipes whose supply pressure from zero exceeds 10 Kgf/cm ² , a control means is provided to control the water supply pressure to the fire extinguishing head to 10 Kgf/cm ² or less, which will be explained later. Branch pipe 1 branched from the main water supply pipe 12
3 and the fire extinguishing head 16 is an automatic alarm valve 15.
The automatic alarm valve 15 is configured to output a fire signal to the fire display panel 21 by detecting a drop in the pressure inside the pipe using a pressure switch 15a when the fire extinguishing head 16 is activated due to a fire and discharges fire extinguishing water. It is composed of

Further, the primary side of the automatic alarm valve 15 of the branch pipe 13 is branched and connected to the drain pipe 14 with a pipe line 13a, and this branch pipe line 13a is equipped with a gate valve 17 and an automatic release valve 18 that is opened when a fire is detected. and the primary pressure of the automatic alarm valve 15 installed in the branch pipe 13 to the specified 10Kgf/cm ²
A primary pressure control valve 20 is provided which is controlled as follows.

On the other hand, the fire signal from the pressure switch 15a of the automatic alarm valve 15 received by the fire display board 21 is given to the pump start board 22, and when the pump start board 22 receives the fire signal from the fire display board 21, the fire signal is sent to the pump start board 22. When starting the pump 10, the automatic release valve 18
The automatic opening valve 18 is configured to open by supplying power to the solenoid valve 23 provided as an opening control means and supplying primary side pressure to the automatic opening valve 18.

Note that the secondary side of the solenoid valve 23 is connected to the drain pipe 14 via a drain valve 24 and a relief valve 25 that are connected in parallel.

Next, the operation of the embodiment shown in FIG. 2 will be explained.

Now, if a fire breaks out on the floor where the branch pipe 13 is installed and the fire extinguishing head 16 operates due to the heat from the fire and releases fire extinguishing water, the branch pipe 13 will be the primary side of the automatic alarm valve 15. The pressure inside the pipe 13 decreases, this pressure decrease is detected by the pressure switch 15a of the automatic alarm valve 15, and a fire signal is output to the fire display panel 21. The fire display panel 21 which has received the fire signal displays an alarm indicating the area where the fire has occurred where the extinguishing head 16 has been activated, and also outputs a fire reception signal to the pump activation panel 22, so that the pump 10 is activated. At the same time, the pump start panel 22 also energizes the solenoid valve 23, and when the solenoid valve 23 is opened, water supply pressure is applied to the automatic release valve 18, which is opened, and the pipe leading to the drain pipe 14 via the primary pressure control valve 20. The road will be opened. The water supply pressure supplied from the pump 10 to the branch pipe 13 exceeds the specified water supply pressure of 10 kgf/cm ² because the branch pipe 13 is installed near the pump 10, and the primary pressure control valve 20 is the specified pressure of the primary side pressure of the automatic alarm valve 15 of 10Kgf/
The water supply pressure is released to the drain pipe 14 so as to be controlled to be less than 10 kgf/cm ² , so that the water pressure supplied to the fire extinguishing head 16 from the automatic alarm valve 15 is maintained at less than 10 Kgf/cm ² .

On the other hand, if the primary pressure control of the automatic alarm valve 15 cannot be performed when a fire is detected due to a failure of the automatic release valve 18 or the primary pressure control valve 20, the water supply pressure from the pump 10 is directly passed through the automatic alarm valve 15 to extinguish the fire. is supplied to the head 16 and therefore the primary pressure control valve 2
Even if 0 is provided, unlike when a conventional pressure reducing valve fails, there is no problem that water cannot be supplied to the fire extinguishing head 16.

FIG. 3 is an explanatory diagram showing an example in which the embodiment of the present invention shown in FIG. 2 is installed in a high-rise building with 18 floors above ground and 3 floors underground. First, the total head of the pump 10 installed on the third floor underground is
The head height from the floor to the 18th floor is h ₁ = 80 m, the radiation pressure head from the fire extinguishing head 16 h ₂ = 10 m, and the head loss of the automatic alarm valve 15 installed in each branch pipe 13 h ₃ = 5 m. Further, assuming that the friction loss head of the joints and valves of the main water supply pipe and branch pipes is h ₄ = 30 m, the total pump head H is given by H = h ₁ + h ₂ + h ₃ + h ₄ = 125 m. Therefore, the discharge pressure of the pump 10 is set to 12.5 Kgf/cm ² by the pump primary pressure control valve 26 provided at the discharge portion of the pump 10 so that the pump total head H=125 m. Therefore, the maximum radiation pressure of the fire extinguishing head is 10Kgf/cm ²
(100m), the total head of the pump is 125m.
-100m = 25m excess. So pump 10
A primary pressure control means equipped with an automatic release valve 18 and a primary pressure control valve 20 configured as shown in Fig. 2 is installed on each floor from the third basement floor where the equipment is installed to the fourth floor above ground, which is within a range of 25 m in head. do.

In this case, the water pressure to the fire extinguishing head is 10Kg.
Even if a primary pressure control means is installed from the third basement floor to the fourth floor above ground where the pressure exceeds f/cm ² , water supply to the fire extinguishing head 16 will not become impossible in the event of a malfunction of this primary pressure control means. There is no problem with conventional pressure reducing valves where the installation of the pressure reducing valve is restricted between the pump installation floor and the third floor. As a result, the total head of the pump 10 installed on the third basement floor can be determined by taking into account the height of the high-rise building, that is, the water supply capacity up to the 18th floor. There is no need to install separate pump equipment in the middle of the ground floor, there is no need for space to install a pump room in the middle of the floor, and the area used in the building can be used effectively, and the number of fire pumps installed is lower than before. Since the cost is half that of the previous one, equipment costs can be significantly reduced.

As explained above, according to the present invention, fire extinguishing equipment is configured such that fire extinguishing water is pressurized by a pump, sent through the main water supply pipe and branch pipes, and sprayed from the fire extinguishing head connected to the branch pipes. For branch pipes where the water supply pressure from the fire pump exceeds the specified pressure, the fire extinguishing head installed in the branch pipe is activated to detect a fire and control the primary pressure of the automatic alarm valve that outputs the output to below the specified pressure. Compared to the conventional pressure reducing valve system, the water supply to the fire extinguishing head will not be cut off when the primary pressure control means installed in the branch pipe breaks down. The number of installation floors is not restricted, and therefore the pump height of the fire pump can be uniquely determined according to the height of the building, and sufficient water supply pressure can be obtained, making it possible to supply water midway between floors in high-rise buildings, etc. There is no need to separately install fire pump equipment to compensate for the drop in pressure and supply water to the upper floors, which allows for an expansion of the usable area of the building and reduces equipment costs as the pump equipment can be halved compared to conventional methods. The effect is that it is possible to achieve a significant reduction in .

In the above embodiment, a single pump was used to supply pressurized water to branch pipes on all floors; For upper floors where the pressure is lower than the specified minimum pressure, pressurizing pump equipment will be installed on the corresponding floor and operated in series, but in this case too, the pump will be lower than the conventional fire extinguishing equipment that uses pressure reducing valves. The number of installed equipment can also be halved,
Effective use of building area and reduction of facility costs are also achieved.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing an example of conventional equipment, Figure 2
The figure is an explanatory diagram showing an embodiment of the present invention on a floor where a pump is installed, and Fig. 3 is an explanatory diagram showing an embodiment of the present invention in a high-rise building with 3 floors underground and 18 floors above ground. 10... Pump, 11... Fire water tank, 12...
Main water supply pipe, 13... Branch pipe, 14... Drain pipe, 15
...Automatic alarm valve, 15a...Pressure switch, 16
... Fire extinguishing head, 17 ... Gate valve, 18 ... Automatic release valve, 20 ... Primary pressure control valve, 21 ... Fire indicator panel, 22 ... Pump start panel, 23 ... Solenoid valve, 24 ... Drain valve, 25... Relief valve, 26...
Primary pressure control valve for pumps.

Claims (1)

[Scope of Claim for Utility Model Registration] In a fire extinguishing system that pressurizes fire extinguishing water using a pump, sends the water through a main water supply pipe and branch pipes, and sprays it from a fire extinguishing head connected to the branch pipes, a prescribed water discharge pressure is applied. The primary side of the automatic alarm valve installed on the piping to the fire extinguishing head of the above-mentioned branch pipe is branch-connected to the drain pipe, and the branch pipe to the drain pipe is automatically opened by a signal from the automatic alarm valve on the fire floor. valve and
A fire extinguishing equipment characterized by comprising: a primary pressure control valve that controls the primary side pressure of the automatic alarm valve to a predetermined pressure, and controls the water discharge pressure of the fire extinguishing head to a predetermined pressure or less.