JPS6235499Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fire extinguishing system that extinguishes a fire by pressurizing and supplying extinguishing liquid from a fire extinguishing pump that is activated in the event of a fire to a sprinkler head provided in a fire extinguishing compartment.

Traditionally, this type of sprinkler fire extinguishing equipment
It is equipped with a fire extinguishing pump that is activated in the event of a fire to supply a pressurized extinguishing fluid, and the extinguishing fluid from the fire pump is supplied to the sprinkler head via a branch pipe that is connected to the main pipe, so that the sprinkler head receives no heat from the fire. The system detects the drop in pressure inside the pipe when the sprinkler head is activated and automatically starts the fire pump.

By the way, in the fire extinguishing equipment mentioned above, in order to be able to see the area where the sprinkler head was activated,
Each branch pipe from the main pipe is equipped with a so-called alarm valve that detects and outputs the flow rate of extinguishing fluid supplied by the operation of the sprinkler head. Even if one or more of them are activated, they can reliably produce an output, and are configured so that no signal is generated at a flow rate of water leakage from piping.
It is structurally complex and expensive, and requires one alarm valve for each branch pipe, making the fire extinguishing equipment more expensive.

In addition, in order to reduce equipment costs, the number of branch pipes is minimized to reduce the number of alarm valves installed, so the sprinkler head operation area based on the alarm valve activation output, that is, the fire area, can be widely displayed. There was also the problem that it was difficult to tell how far the fire had spread.

Therefore, in order to solve the problems with conventional fire extinguishing equipment using alarm valves, the inventors of the present application
In addition to a low-pressure pump that supplies fire extinguishing liquid to the sprinkler head through the main pipe and branch pipe in the event of a fire, a high-pressure pump is connected to the main pipe to maintain the pressure inside the pipe at a predetermined pressure higher than the discharge pressure of the low-pressure pump during non-fire situations. In addition, a pressure switch for fire detection, which replaces the conventional alarm valve, is installed on the output side of the check valve that supplies fire extinguishing liquid only to the sprinkler head side installed in the branch pipe, and the pressure inside the pipe on the sprinkler head side that is applied to this pressure switch is The set pressure of the pressure switch is determined so that it outputs when the discharge pressure falls below the set pressure that is between the discharge pressure of the low pressure pump and the high pressure pump, and the output status of this pressure switch is received and displayed. Instead, it is possible to use a pressure switch with a simple structure and low cost, thereby significantly reducing equipment costs, and it is possible to indicate a fire by operating a sprinkler head corresponding to a warning area by a fire detector. He proposed a fire extinguishing system with the following structure (Utility Application No. 56-143334, Utility Model Application No. 58-46351).

By the way, in the above-mentioned fire extinguishing equipment proposed by the inventors of the present application, a pressure switch, which has a simple structure and is inexpensive in cost, is used instead of the conventional alarm valve as a means for detecting the compartment where a fire has occurred due to the operation of the sprinkler head. However, in order to make it possible to use a pressure switch, two fire extinguishing pumps are required: a low-pressure pump with a large flow rate and a high-pressure pump with a small flow rate, making the pump equipment complicated. Cheap.

The present invention was developed in view of the above, and is a fire extinguishing system that uses only one fire pump to detect a pressure drop caused by the operation of a sprinkler head using a pressure switch installed in a branch pipe to indicate a fire. In order to make it possible to indicate a fire by detecting the pressure drop in the branch pipe due to the operation of the sprinkler head by using a pressure switch, a pressure switch installed in the branch pipe changes the main pipe pressure when the fire pump starts due to the operation of the sprinkler head. An object of the present invention is to provide a fire extinguishing equipment which is equipped with a fire extinguishing fluid pressure control means for controlling the pressure to a predetermined pressure lower than the set pressure of the fire extinguishing equipment, thereby simplifying the fire extinguishing equipment and reducing the equipment cost.

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

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

First, to explain the configuration, 1 is a main pipe to which extinguishing liquid is supplied. For example, if we take fire extinguishing equipment in a building, etc., the main pipe 1 is divided into fire extinguishing compartments A, B, and C divided by floor. branch pipe 2a,
Taking a branch pipe 2a as an example in which each of the pipes 2b and 2c are connected in a branch manner, the branch pipe 2a is equipped with a check valve 4.
a is interposed, and the check valve 4a has a plurality of sprinkler heads 3 connected to the end of the branch pipe 2a.
The output side of this check valve 4a is provided so that the fire extinguishing liquid is supplied only to the side, and the output side of this check valve 4a is provided with a check valve 4a that is connected to a valve when the pressure in the branch pipe 2a drops below a predetermined set pressure _P3 due to the operation of one of the sprinkler heads 3. A pressure switch 5a is provided which outputs an output at certain times. Check valves 4b, 4c are similarly applied to other branch pipes 2b, 2c.
and pressure switches 5b and 5c, respectively. Each output of the pressure switches 5a to 5c provided in the branch pipes 2a to 2c is connected to a fire indicator panel 6, and the pressure switches 5a to 5 are connected to the fire indicator panel 6.
The output status of c is displayed.

On the other hand, the main pipe 1 is connected to the discharge side of a fire pump 7 installed in the basement of a building, etc., and a water tank 8 that stores fire extinguishing liquid as pumping equipment for the fire pump 7 and a water tank 8 for priming the fire pump 7 are connected. Water tank 9,
A pump starting panel 10 and a pressure tank 12 equipped with a pump starting pressure switch 11 which is activated and outputs a pump starting signal when the internal pressure in the main pipe 1 drops below a predetermined pump starting pressure _P2 are provided. Further, an elevated water tank 13 is provided on the roof side of the main pipe 1 so that the main pipe 1 and the branch pipes 2a to 2c can be filled with water.

In addition to such a configuration of the fire extinguishing equipment, in the present invention, the pressure of the extinguishing fluid from the fire pump 7 is applied to the main pipe 1, and the set pressure P ₃ of the pressure switches 5a to 5c provided in the branch pipes 2a to 2c is controlled. A secondary pressure control valve 15 is interposed which operates as a pressure reducing valve to suppress the control pressure to a predetermined control pressure P ₄ below, and is connected in parallel with the secondary pressure control valve 15 to prevent pressure fluctuations caused by a flow rate equivalent to water leakage to the fire pump 7 side. Orifice 1 with a small flow rate that does not transmit the pressure drop to the fire pump 7 side due to the flow rate caused by the operation of the sprinkler head 3.
6 is connected.

Here, the pump cutoff pressure P ₁ of the fire pump 7, the starting pressure P ₂ of the pump starting pressure switch 11, and the pressure switches 5a to 5 provided in the branch pipes 2a to 2c are calculated.
The set pressure P ₃ of c and the secondary control pressure P ₄ by the secondary pressure control valve 15 are set so that P ₁ >P ₂ >P ₃ >P ₄ . That is, as shown in FIG. 2, the pump shut-off pressure _P1 is the highest, followed by the pump starting pressure _P2 of the pump starting pressure switch 11, and further below the pump starting pressure _P2 are the pressure switches 5a to 5c. A set pressure P ₃ is determined, and a secondary control pressure P ₄ by the secondary pressure control valve 15 is set as the lowest pressure.
Of course, the secondary control pressure _P4 is determined to be within the prescribed radiation pressure range of 1 to 10 kg/ ^cm2 at the sprinkler head 3.

Next, the operation of the embodiment shown in FIG. 1 will be explained.

First, in the normal monitoring state, the pump cut-off pressure _P1 obtained by starting the fire pump 7 is applied to each of the main pipe 1 and branch pipes 2a to 2c via the orifice 16, and A pump cut-off pressure _P1 is applied to each of the sprinkler heads 3. Therefore, all of the pressure switches 5a to 5c and the pump starting pressure switch 11 provided in the pressure tank 12 are placed in a non-operating state. Next, for example, if a fire breaks out in section A and one of the sprinkler heads 3 is activated, the pressure in the branch pipe 2a will drop due to the release of fire extinguishing liquid due to the activation of the sprinkler heads 3. This decrease in the pressure inside the branch pipe 2a is also transmitted to the main pipe 1, and since the supply of cut-off pressure _P1 through the orifice 16 is not in time, the main pipe becomes the output side of the secondary pressure control valve 15. The pressure inside the pipe 1 decreases to the set pressure P ₄ of the secondary pressure control valve 15 . At this time, the pressure inside the branch pipe 2a also decreases to the set pressure _P4 of the secondary pressure control valve 15, which is lower than the set pressure _P3 of the pressure switch 5a, so the pressure switch 5a is activated and produces a detection output.
The fire display panel 6 displays that a fire has occurred in section A and the sprinkler head has been activated. Then, the pressure inside the main pipe 1 that has decreased to the secondary control pressure P ₄ is reduced to the secondary control pressure P ₄ via the secondary pressure control valve 15. and when the pump starting pressure falls to _P2 of the pump starting pressure switch 11 provided in the pressure tank 12, the pump starting pressure switch 11 generates a detection output and gives a starting signal to the starting board 10,
As a result, the fire pump 7 is activated. The fire extinguishing liquid from the activated fire pump 7 flows through the secondary pressure control valve 15.
The pressure is reduced to the secondary control pressure _P4 , and extinguishing liquid is discharged from the sprinkler head 3 operating in section A via the main pipe 1 and branch pipe 2a. On the other hand, the branch pipes 2b, 2 which are on the sprinkler head side of the check valves 4b, 4c in the sections B, C where the sprinkler head 3 is not operating.
Even if the pressure in the main pipe 1 drops to the secondary control pressure _P4 , the pressure inside the pipe c remains at the pump cut-off pressure _P1 by the check valves 4b, 4c, each is in an inactive state. If the fire then spreads to section B and one of the sprinkler heads 3 is activated, the pressure inside the branch pipe 2b will drop to the secondary control pressure _P4 of the main pipe 1, as in the case in section A. The pressure switch 5b operates and outputs a fire detection signal for section B to the fire display panel 6.

Next, a case where water leakage occurs in the middle of the branch pipe 2a will be explained.

If a water leak occurs in the middle of the branch pipe 2a, the pressure in the branch pipe 2a will drop slowly, and this drop in pressure inside the branch pipe 2a will be transmitted to the main pipe 11, and then transmitted to the fire pump via the orifice 16. This will be communicated to the 7th side. When this gradual pressure drop reaches the pump starting pressure P2 of the pump starting pressure switch 11 provided in the pressure tank 12, the pump starting pressure switch 11 generates a detection output and gives a starting signal to the starting board 10, As a result, the fire pump 7 is activated. The pump cut-off pressure P1 obtained from the started fire pump 7 is applied to the orifice 1.
6 to the main pipe 1 and branch pipe 2a.

In other words, if there is a gradual pressure drop due to water leakage in the piping,
Since the cut-off pressure P1 obtained from the fire pump 7 can be applied via the orifice 16 before the pressure decreases to the pressure switch setting pressure P3, the pressure switch 5a will not operate.

FIG. 3 is an explanatory diagram showing another embodiment of the present invention. In this embodiment, the discharge force of the fire pump 7 is directly controlled by the secondary pressure control valve 15 in the embodiment of FIG.
The feature is that the pressure is controlled to be the same as the control pressure _P4 .

That is, the discharge pipe portion of the fire pump 7 is branched and connected to the water tank 8, and the branch pipe to the water tank 8 is provided with a primary pressure control valve 18 that functions as a bypass valve to maintain the pump discharge pressure at a predetermined pressure ^P4. , primary pressure control valve 18
This operation is performed by turning on the solenoid valve 20 which is activated based on the fire signal from the pressure switches 5a to 5c inputted to the fire indicator panel 6. Further, the fire pump 7 is also started based on the fire signals from these pressure switches 5a to 5c. A check valve 22 is connected to the main pipe 1 to the pressure tank 12 equipped with the pressure switch 11 for starting the pump.
is interposed and connects an orifice 24 in parallel with the check valve 22 to transmit a drop in pressure inside the pipe due to water leakage in the pipe, and activate the fire pump 7. Since the other configurations are similar to those of the embodiment shown in FIG. 1, the same reference numerals are given to the other components, and the explanation thereof will be omitted. In addition, the pump cut-off pressure of fire pump 7
P ₁ , pump starting pressure P ₂ of pressure switch 11 for starting the pump in case of water leakage, setting pressure of pressure switches 5a to 5c
The pressure relationship shown in FIG. 2 is established between P ₃ and the control pressure P ₄ of the primary control valve 18, as in the embodiment shown in FIG.

Next, the operation of the embodiment shown in FIG. 3 will be explained. First, in the normal monitoring state, the solenoid valve 20 is off, the primary pressure control valve 18 is not activated, and the cut-off pressure _P1 of the fire pump 7 is the same as that of the main pipe 1 and the branch pipes 2a to 2a.
It is added to each of 2c. In this state, for example, if one of the sprinkler heads 3 in section A is activated due to a fire and releases extinguishing liquid, the pressure inside the branch pipe 2a and the main pipe 1 will decrease, and the set pressure P ₃ of the pressure switch 5a will decrease.
The pressure switch 5a generates a detection output when the pressure drops below the pressure limit, and the fire display panel 6 indicates that a fire has occurred in section A and the sprinkler head 3 has been activated.Furthermore, the fire pump 7 is started and the fire display is displayed at the same time. An operating signal is output from the panel 6 to the electromagnetic valve 20, the electromagnetic valve 20 is turned on, and the primary pressure control valve 18 is put into an operating state. Therefore, the pressure inside the main pipe and the branch pipe 2a decreases to the control pressure _P4 by the primary control valve 18. The pressure of the extinguishing liquid discharged when the extinguishing pump 7 is started is suppressed to the control pressure P ₄ through the bypass action of the primary pressure control valve 18, and
The extinguishing liquid is discharged from the extinguishing head 5 via the branch pipe 2a. At this time, the pressure inside the branch pipes 2a and 2c of the other sections B and C is reduced by the check valve 4.
The pump cut-off pressure is maintained at P ₁ by b and 4c,
Thereafter, when the sprinkler heads 3 are activated in compartments B and C, the pressure switches 5b and 5c detect the pressure drop due to the activation of the sprinkler heads 3, and the fire display panel 6 is made to display a fire indication.

In addition, if the pressure inside the main pipe 1 drops due to water leakage etc. during normal monitoring conditions, this pressure drop will be transferred to the pressure tank 1 via the orifice 24.
2, and when the pressure decreases to the set pressure P ₂ of the pump starting pressure switch 11, a starting signal is output to the pump starting board 10 to start the fire pump 7, and the internal pressure in the main pipe 1 is always kept at the pump cut-off pressure P. I'm keeping it at ₁ .

As explained above, according to the present invention, the pressure drop caused by the operation of the sprinkler head installed in the branch pipe is detected by the pressure switch installed on the sprinkler head side of the check valve, and a fire indication is performed, so that the normal monitoring status is maintained. In this system, the internal pressure of the main pipe and branch pipe is maintained at the cut-off pressure of the fire pump, and in the event of a fire in which the sprinkler head is activated, a pressure switch is activated due to the drop in internal pressure to indicate a fire and start the fire pump. Since the pressure control means controls the internal pressure of the main pipe to a predetermined pressure that is lower than the set pressure of the pressure switch, one fire extinguishing pump can be used to control the internal pressure of the main pipe at a predetermined internal pressure and fire under normal monitoring conditions. When started, the pressure in the pipe can be controlled to be lower than the normal pressure.
Since only one fire extinguishing pump is required, it is possible to simplify the fire extinguishing equipment and reduce equipment costs.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing one embodiment of the present invention, Fig. 2 is an explanatory diagram showing the relationship of pressure settings in the embodiment of Fig. 2, and Fig. 3 is an explanatory diagram showing another embodiment of the present invention. FIG. 1... Main pipe, 2a to 2c... Branch pipe, 3... Sprinkler head, 4a to 4c...
...Check valve, 5a-5c...Pressure switch, 6...
Fire display panel, 7... Fire pump, 8... Water tank, 9
... Priming tank, 10 ... Pump starting panel, 11 ... Pressure switch for starting pump, 12 ... Pressure tank,
13...Elevated water tank, 15...Secondary pressure control valve, 16
...Orifice, 18...Primary pressure control valve, 20...
…solenoid valve.

Claims (1)

[Scope of Claim for Utility Model Registration] A main pipe that supplies extinguishing liquid from a fire extinguishing pump having a predetermined cut-off pressure, and a branch pipe that is branch-connected to the main pipe and supplies extinguishing liquid to a sprinkler head installed in a fire extinguishing compartment. , a check valve installed in the branch pipe that supplies fire extinguishing liquid only to the sprinkler head side, and a pressure on the output side of the check valve is detected, and the detected pressure is a predetermined value from the cutoff pressure of the fire pump. A pressure switch that outputs an output to display a fire area on the receiver when the pressure drops below a low set pressure, and a pressure switch that sets the cut-off pressure of the fire pump and the pressure switch that outputs an output to display the fire area on the receiver. a pump starting pressure switch that outputs a starting signal to the fire pump when the pressure drops below a predetermined pump starting pressure; a fire extinguishing fluid pressure control means for controlling the pressure in the main pipe to a predetermined pressure lower than the set pressure of the pressure switch when the fire pump is started; A fire extinguishing equipment characterized by being equipped with an orifice that transmits a pressure drop to a pressure tank.