JPH04266774A - Feed water pressure control system for fire extinguishing equipment - Google Patents

Abstract

PURPOSE:To obtain a feed water pressure control system for fire extinguishing equipment to feed water to a fire extinguishing appliance at pressure suitable for the installation place thereof. CONSTITUTION:Fire extinguishing equipment to feed water to a fire extinguishing appliance such as a sprinkler 1 through a feed water pump operating on a signal from a flow detection device 4 or a pressure switch 17, is fitted with a pressure detection device such as a pressure sensor 5 for detecting the secondary side pressure of the flow detection device 4, and an electrically operated valve 16 having a freely controllable opening for adjusting the feed water pressure of a main pipe 9. Pressure detected with the pressure detection device is compared with the predetermined reference pressure in an information processing section 7, thereby controlling the opening of the electrically operated valve 16.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is applicable to fire extinguishing equipment such as sprinklers installed on each floor of a building, and detects a drop in pressure inside the pipe by a flowing water detection device installed in a branch pipe on each floor or connected to the main pipe. Regarding fire extinguishing equipment that supplies water from a water supply pump located in a basement or the like via a water supply pipe in response to an activation signal from a pressure switch for starting the pump, in particular, an electric valve that can freely control the opening is provided in the water supply pipe, and Relating to a water supply pressure control system for fire extinguishing equipment that detects the water supply pressure in the water supply piping and controls the opening degree of the electric valve so as to obtain the necessary water supply pressure according to the height of each floor, the number of fire extinguishing devices, etc. .

0002

[Prior Art] Conventionally, in this type of fire extinguishing equipment, an activation signal from a flowing water detection device or a pressure switch for starting a pump is required to be sent to the top floor, regardless of which floor the signal comes from. Operate the water supply pump at full capacity to ensure adequate pressure. In this case, after the water supply pump is activated, the water supply pressure increases at once until it reaches the full capacity of the water supply pump, and then that pressure is maintained to supply water.

0003

[Problem to be solved by the invention] However, in such conventional fire extinguishing equipment, water is supplied at a pressure that can secure the necessary pressure on the top floor, so when the pump is started at the time of a fire or inspection, it is difficult to reach the top floor. There was a problem in that more pressure than necessary was applied to the piping outside of the floors, and if this condition continued for a long time, excessive force was applied to the piping, shortening the life of the piping system. Furthermore, since the water supply pressure rapidly increases to a predetermined pressure after the water supply pump is started, there is a problem in that water hammer caused by the sudden pressure may cause an accident in the piping system.

The present invention solves the above problems by detecting the water supply pressure in the water supply piping, controlling the opening degree of the electric valve based on the detected pressure, and adjusting the pressure to the fire extinguisher according to its installation location. The purpose of this invention is to provide a water supply pressure control system for fire extinguishing equipment that supplies water.

[0005]

[Means for Solving the Problems] In order to solve the above problems, the present invention includes a fire extinguishing system installed on each floor of a building, a main pipe for supplying water to the fire extinguishing system, and a branch pipe for each floor. It is equipped with a water supply pump that is activated by a pump start signal from a water flow detection device installed in the branch pipe or a pressure switch for starting the pump connected to the main pipe that detects a drop in pressure inside the pipe, and the water supply pump is used to control the fire extinguishing system. The fire extinguishing equipment that supplies water has a pressure detection device that detects the pressure on the secondary side of the flowing water detection device, and a valve that is installed in the main pipe and whose opening degree can be controlled freely, and by controlling the opening degree of the valve. An electric valve adjusts the water supply pressure in the main pipe to adjust the pressure in the branch pipe, and the pressure detected by the pressure detection device is compared with a preset reference pressure, and the The present invention is characterized by comprising an information processing section that controls the opening degree of the electric valve so that the pressure detected by the pressure detection device becomes the reference pressure.

[0006] The second aspect of the invention is characterized in that the pressure sensing device is a pressure sensor that sends the pressure on the secondary side of the flowing water sensing device to the information processing section as analog information.

[0007] In the third aspect of the invention, there is provided a pressure switch that outputs a detection signal when the pressure on the secondary side of the flowing water detection device reaches a preset reference pressure, and a pressure switch that is provided on the main pipe and that adjusts the opening degree. An electric valve that has a freely controllable valve and adjusts the water supply pressure in the main pipe and the pressure in the branch pipe by controlling the opening degree of the valve according to a signal from the pressure switch; and the pressure switch. The invention is characterized by comprising an information processing unit that receives a detection signal from the pressure switch and controls the opening of the electric valve to an opening that always receives the detection signal from the pressure switch on the floor where the running water detection device is activated. .

[0008] The invention according to item 4 has a pressure detection device for detecting the pressure in the main pipe, and a valve provided in the main pipe whose opening degree can be freely controlled, and the water supply in the main pipe is controlled by controlling the opening degree of the valve. an electric valve that adjusts the pressure in the branch pipe; and a motor-operated valve that detects the operation of the water flow detection device and connects it to the main pipe in order to obtain a preset reference pressure at the floor where the water flow detection device is activated. Compare the pressure required at the position of the installed pressure detection device with the pressure detected by the pressure detection device, and determine whether the pressure detected by the pressure detection device installed in the main pipe is the pressure necessary to obtain the above reference pressure on the relevant floor. and an information processing section that controls the opening degree of the electric valve so that the pressure corresponds to .

In the invention of item 5, the pressure sensing device is provided in the main pipe between the water supply pump and the first branch of the branch pipe, and the pressure in the main pipe is used as analog information to detect the pressure in the main pipe. It is characterized in that it is a pressure sensor that sends out data to the information processing section.

The invention according to item 6 is characterized in that a bypass pipe and a second valve are provided in the main pipe in parallel with the electric valve.

[0011]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of a system according to the present invention. As shown in FIG. 1, this embodiment is basically similar to conventional fire extinguishing equipment, in which a water supply pump is sent to the sprinkler 1 installed on each floor through a water supply pipe consisting of a main pipe 9 and a branch pipe 2 when a fire occurs. This is a fire extinguishing system that supplies water from 3. Here, in this embodiment, the pressure on the secondary side of the flowing water detecting device 4 is detected by the pressure sensor 5 provided on the secondary side of the valve body of the flowing water detecting device 4 provided for each floor, and the pressure on the secondary side of the flowing water detecting device 4 is detected. The detected pressure is compared with a preset reference pressure, and the opening degree of the motor-operated valve 16 is controlled so that the optimum pressure can be obtained on any floor where a fire has occurred.

In this embodiment, a sprinkler 1, a branch pipe 2 for supplying water to the sprinkler 1, and a flowing water detection device 4 are provided on each floor of the building. This running water detection device 4 is provided with a pressure switch 8 and a pressure sensor 5 connected to an information processing section 7 via a relay 11. Note that the flowing water detection device 4 is provided in the branch pipe 2 near where it branches from the main pipe 9. Further, a water supply pump 3 is provided in a basement of a building or the like, and is connected to a branch pipe 2 via a main pipe 9.

On the other hand, the main pipe 9 is provided with an electric valve 16 whose opening degree can be controlled freely between the first branch part 15 between the branch pipe 2 of each floor and the main pipe 9 and the water supply pump. This electric valve 16
is connected to the information processing section 7, and its opening degree can be variably controlled by a signal from the information processing section 7.

Next, the operation of this embodiment will be explained. This embodiment is a so-called closed type wet sprinkler system using a closed type sprinkler head, and a pressure tank 12 always applies a constant pressure.

[0015] When a fire breaks out on a certain floor, the sprinkler head of the sprinkler 1 is opened by the heat and water is released. When water is discharged from the sprinkler head, the pressure inside the piping decreases and the pressure tank 12 can no longer replenish the pressure. When the pressure inside the pressure tank 12 falls below a predetermined pressure, the pressure switch 17 detects this and issues a pump start signal. It is sent to the information processing section 7. The information processing unit 7 that has received the pump activation signal sends a command to the pump control unit 6 to activate the water supply pump 3. Upon receiving this command, the pump control section 6 starts the water supply pump 3. Water supply pump 3
When started, water is supplied to the branch pipe 2 via the main pipe 9,
As the rotation speed of the water supply pump 3 increases, the pressure in the branch pipe 2 gradually increases. Furthermore, when the sprinkler head is operated and water is discharged, a flow of fire extinguishing water is generated within the branch pipe 2, and this flow opens the valve body within the flowing water detection device 4.
An activation signal from the pressure switch 8, which closes the contacts by the pressure of the fire extinguishing water that has passed through the waterway formed by opening the valve body, is also sent to the information processing section 7 and the like.

On the other hand, the pressure on the secondary side of the flowing water detection device 4 is constantly monitored by a pressure sensor 5, and its analog data is sent to the information processing section 7 via a repeater 11. Further, the information processing unit 7 determines on which floor the fire occurred based on the activation signal of the running water detection device 4, that is, the signal from the pressure switch 8. A reference pressure necessary for extinguishing a fire is set in advance in the information processing unit 7, and the information processing unit 7 receives pressure data sent from the pressure sensor 5 installed in the running water detection device on the floor where the fire occurred. and the reference pressure.

Next, when the pressure on the secondary side of the flowing water detection device 4 increases and reaches the above-mentioned reference pressure, the information processing section 7 controls the opening degree of the electric valve 16 to gradually increase the opening degree from the fully open state. Outputs a command to maintain that pressure by decreasing it. Thereafter, while comparing the pressure data from the pressure sensor 5 with the reference pressure, the opening degree of the electric valve 16 is controlled to keep the pressure on the secondary side of the flowing water detection device 4 constant.

In the first embodiment, the pump activation signal is sent by the pressure switch 17, but the pump may be activated by an activation signal from the pressure switch 8. Additionally, if a fire occurs on multiple floors, water is supplied so that the pressure on the upper floors reaches the standard pressure, for example.

Next, a second embodiment of the present invention will be explained. FIG. 2 is a block diagram showing a second embodiment of the system according to the present invention. This embodiment is a system having almost the same configuration as the first embodiment, except that a pressure switch 13 is used in place of the pressure sensor 5 of the first embodiment.

In this embodiment, as in the first embodiment, the water supply pump 3 is activated by a pump activation signal from the pressure switch 17, and supplies water to the branch pipe 2. In this embodiment, the reference pressure is set in advance for the pressure switch 13 on each floor. When the pressure on the secondary side of the flowing water detection device 4 reaches the reference pressure, the pressure switch 13
sends a signal to that effect. Upon receiving this signal, the information processing unit 7 issues a command to control the opening degree of the electric valve 16 so that the signal from the pressure switch 13 on the floor where the running water detection device is activated is always sent. That is, when the pressure in the branch pipe 2 decreases and the signal from the pressure switch 13 is interrupted, the opening degree of the electric valve 16 is increased to increase the pressure in the branch pipe 2, and when the signal is received again, the increase in the opening degree is stopped. . In this case, by making the pressure switch 13 have a contact point other than the reference pressure, more accurate opening control can be performed. That is, by further sending a signal when the pressure reaches a certain pressure higher than the reference pressure, it is possible to stop increasing the opening degree of the electric valve 16 and maintain the pressure in the branch pipe 2 above the reference pressure at all times. Note that in the first and second embodiments, the pressure on the secondary side of the flowing water detecting device was detected by detecting the pressure on the secondary side of the flowing water detecting device itself, that is, the pressure on the secondary side of the valve body. Of course, any location may be used as long as it is on the secondary side of the flowing water detection device. However, it is desirable to provide a pressure sensor and a pressure switch near the water flow detection device or at the end of the branch pipe.

FIG. 3 is a block diagram showing a third embodiment of the system according to this embodiment. This embodiment is also a system having almost the same configuration as the first embodiment, except that a pressure sensor 14 is provided on the main pipe 9 instead of the pressure sensor 5 provided on each floor. In the case of this embodiment, the pressure sensor 14 is provided together with the electric valve 16 in the main pipe 9 between the water supply pump 3 and the first branch part 15 between the main pipe 9 and the branch pipe 2 of each floor. It is connected to the processing section 7.

In this embodiment, as in the first embodiment, the water supply pump 3 is activated by a pump activation signal from the pressure switch 17 to supply water. In this example,
In the information processing unit 7, pressure data necessary for obtaining a reference pressure for each floor at the position of the pressure sensor 14 in order to obtain a reference pressure necessary for extinguishing a fire is preset for each floor. Therefore, when the floor where the fire occurred is determined based on the activation signal from the pressure switch 8, the information processing unit 7 receives the pressure data sent from the pressure sensor 14 and the pressure corresponding to the floor where the fire occurred in the information processing unit 7. Compare with data. When the data from the pressure sensor 14 reaches a predetermined pressure, a command is issued to the motor-operated valve 16, and the opening degree of the motor-operated valve 16 is controlled as in the first embodiment.

FIG. 4 is a block diagram showing a fourth embodiment of the system according to this embodiment. In this embodiment, a bypass pipe 41 and a second electrically operated valve 42 are provided in the main pipe 9 in parallel with the electrically operated valve 16 in the first embodiment described above.
6. Perform backup.

In this embodiment, water is supplied in the same manner as in the first embodiment, but if the pressure in the branch pipe 2 does not reach the reference pressure even after issuing a command to fully open the electric valve 16, the information processing The unit 7 issues a command to open the second electric valve 42 . That is, if, for example, some kind of failure occurs in the electric valve 16 and the valve opening is not large enough or the valve does not open at all, the water supply is secured via the bypass pipe 41 and the electric valve 42. do. In this case, although one set of bypass pipe and electric valve is shown in this embodiment, it is also possible to provide a plurality of sets to further improve reliability. Further, the second motor-operated valve is not limited to an electrically-operated valve, and it goes without saying that a manual valve may be used.

Although a sprinkler was used as the fire extinguishing device in this embodiment, the present system can also be applied to, for example, foam fire extinguishing equipment. The present invention can also be applied to fire hydrant equipment by providing a pressure detection device on the secondary side of the hydrant valve. Furthermore, an electric valve 16 may be provided on each floor to control the water supply pressure on each floor. others,
In this embodiment, the opening degree of the motor-operated valve 16 is controlled in such a way that the opening degree is gradually reduced from fully open, but of course the opposite may be used.

[0026]

Effects of the Invention As described above, the water supply pressure control system for fire extinguishing equipment according to the present invention detects the pressure on the secondary side of the flowing water detection device on each floor and uses an electric valve to secure the pressure necessary for extinguishing a fire. Since the degree of opening is controlled, water can be supplied at the appropriate pressure even if a fire occurs on any floor. Therefore, it becomes possible to extinguish fire efficiently and effectively. Furthermore, it has the effect of preventing accidents caused by excessive pressure being applied to the piping system and increasing the life of the piping system.

Furthermore, according to the second aspect of the invention, by using a pressure sensor as the pressure detection device, there is an effect that the pressure in the water supply pipe can be accurately grasped at all times. Therefore, it is possible to accurately control the opening degree of the electric valve, and not only monitor the pressure when water is released in the event of a fire, but also increase the pressure inside the pipes during normal times due to gas generation due to rotting water in the pipes. It is also possible to monitor the decrease in pipe pressure due to water leakage.

[0028] According to the third aspect of the invention, by using a pressure switch as the pressure detection device, there is an effect that the device can be made simpler than the case where a pressure sensor is used. Therefore, the cost of the system can be reduced compared to the case where a pressure sensor is used.

In the invention of item 4, since the pressure detection device is installed in the main pipe before the first branch point between the main pipe and the branch pipe, it is possible to control the water supply pressure on each floor with one sensor. effective. Therefore, it is possible to simplify the system, prevent failures, and reduce costs.

[0030] In the invention of item 5, the same effect as the invention of item 2 can be obtained. Furthermore, in the invention of item 6, by providing a plurality of electrically operated valves in parallel, it is possible to back up the electrically operated valves. Therefore, water supply to the fire extinguishing equipment can be ensured even when the electric valve fails.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing a first embodiment of a system according to the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of the system according to the present invention.

FIG. 3 is a configuration diagram showing a third embodiment of the system according to the present invention.

FIG. 4 is a configuration diagram showing a fourth embodiment of the system according to the present invention.

[Explanation of symbols]

1 Sprinkler (fire extinguishing system) 2 Branch pipe 3 Water supply pump 4 Flowing water detection device 5 Pressure sensor 6 Pump control section 7 Information processing department 8 Pressure switch 9. Supervisor 13 Pressure switch 14 Pressure sensor 15 Branch 16　Electric valve 17 Pressure switch 41 Bypass pipe 42 Second valve

Claims (6)

[Claims] [Claim 1] A fire extinguishing system installed on each floor of a building,
Main pipes and branch pipes for each floor to supply water to the above fire extinguishing system, and pumps from flowing water detection devices installed in the branch pipes and pressure switches connected to the main pipes to start pumps that detect drops in pressure inside the pipes. A fire extinguishing equipment comprising a water supply pump activated by a start signal and supplying water to the fire extinguishing system by the water supply pump, a pressure detection device configured to detect the pressure on the secondary side of the flowing water detection device, and provided in the main pipe,
an electric valve that has a valve whose opening degree can be freely controlled and adjusts the water supply pressure in the main pipe and the pressure in the branch pipe by controlling the opening degree of the valve; and the pressure detected by the pressure detection device. and an information processing unit that compares a preset reference pressure and controls the opening degree of the electric valve so that the pressure detected by the pressure detection device on the floor where the flowing water detection device is activated is set as the reference pressure. A water supply pressure control system for fire extinguishing equipment, characterized by: 2. The water supply pressure of the fire extinguishing equipment according to claim 1, wherein the pressure detection device is a pressure sensor that sends the pressure on the secondary side of the flowing water detection device to the information processing unit as analog information. control system. [Claim 3] A fire extinguishing system installed on each floor of the building,
Main pipes and branch pipes for each floor to supply water to the above fire extinguishing system, and pumps from flowing water detection devices installed in the branch pipes and pressure switches connected to the main pipes to start pumps that detect drops in pressure inside the pipes. In a fire extinguishing system that is equipped with a water supply pump that is activated by a start signal and that supplies water to the fire extinguishing system using the water supply pump, detection is performed when the pressure on the secondary side of the flowing water detection device reaches a preset reference pressure. It has a pressure switch that outputs a signal and a valve that is installed in the main pipe and whose opening degree can be controlled freely, and by controlling the opening degree of the valve according to the signal from the pressure switch, the water supply pressure in the main pipe is adjusted. an electric valve that adjusts the pressure in the branch pipe;
comprising an information processing unit that receives the detection signal from the pressure switch and controls the opening degree of the electric valve to always receive the detection signal from the pressure switch on the floor where the flowing water detection device is activated; Features: Water supply pressure control system for fire extinguishing equipment. [Claim 4] A fire extinguishing system installed on each floor of the building;
Main pipes and branch pipes for each floor to supply water to the above fire extinguishing system, and pumps from flowing water detection devices installed in the branch pipes and pressure switches connected to the main pipes to start pumps that detect drops in pressure inside the pipes. The fire extinguishing equipment is equipped with a water supply pump that is activated by a start signal, and the water supply pump supplies water to the fire extinguishing system, comprising: a pressure detection device that detects the pressure in the main pipe; and a valve that is provided in the main pipe and whose opening degree can be freely controlled. and a motor-operated valve that adjusts the water supply pressure in the main pipe to adjust the pressure in the branch pipe by controlling the opening degree of the valve, and a preset water flow detection device that detects the operation of the water flow detection device. In order to obtain the standard pressure on the floor where the device was activated, the required pressure at the position of the pressure detection device installed in the main pipe was compared with the pressure detected by the pressure detection device, and the pressure detected by the pressure detection device installed in the main pipe was compared. A water supply pressure control system for fire extinguishing equipment, comprising: an information processing unit that controls the opening degree of the electric valve so that the pressure corresponds to the pressure required to obtain the reference pressure on the floor; . 5. The pressure sensing device is located in the main pipe.
A fire extinguisher according to claim 4, characterized in that the pressure sensor is provided between the water supply pump and the first branch of the branch pipe and sends the pressure in the main pipe as analog information to the information processing section. Equipment water supply pressure control system. 6. Claim 1, wherein the main pipe is provided with a bypass pipe and a second valve in parallel with the electric valve.
A water supply pressure control system for fire extinguishing equipment according to claim 5.