JP2019111044A - Sprinkler fire extinguishing system - Google Patents

Abstract

To provide a sprinkler fire extinguishing system that allows pressure in a branch pipe of each floor to be adjusted to an appropriate level.SOLUTION: A branch pipe 10 branched from a water supply pipe 5 for supplying water from a fire pump 1 is disposed in a protection zone, and a plurality of sprinkler heads 12 are provided along the downstream side from the upstream side of the branch pipe 10. The terminal of the branch pipe 10 has a drain part 13 for draining water, and the drain part 13 includes a pressure sensor 14 for measuring the pressure in the pipe, and a regulating valve 15 capable of adjusting water volume that is controlled so that the pressure measured by the pressure sensor 14 when the sprinkler heads 12 are operated is within a predetermined range.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sprinkler extinguishing system having a plurality of sprinkler heads that discharge water when a fire occurs in a building.

  In buildings such as buildings, sprinkler fire extinguishing equipment is installed to extinguish water by discharging water when a fire occurs. The sprinkler fire extinguishing facility has a water supply pipe connected to a fire extinguishing pump that supplies water in the fire extinguishing tank, and the water supply pipe is disposed along the height direction of the building and a branch pipe branched from the water supply pipe on each floor The connecting pipe is disposed in the protection section, and a plurality of sprinkler heads are provided along the upstream side to the downstream side. The sprinkler head automatically opens when it receives the heat flow from the fire.

  In a wet sprinkler fire extinguishing system, water pressure is previously applied to the position of the sprinkler head, and when the sprinkler head is opened in the event of a fire, water discharge is immediately started. When the water discharge is started and the pressure in the piping decreases, the pressure switch provided on the pressure tank of the fire extinguishing pump operates and the pump is started, and water can be continuously supplied to the sprinkler head. . As such a sprinkler fire extinguishing installation, there exists a thing which is mentioned to patent document 1, for example.

JP, 2015-58229, A

  In the sprinkler fire extinguishing system, it is necessary to secure sufficient water pressure also at the end of the branch pipe on the top floor. In this case, the lower level branch pipes are subjected to more water pressure than necessary, causing water loss during operation of the sprinkler head. In order to prevent this, a pressure reducing valve is provided upstream of the branch pipe on the lower floor. The pressure reducing valve prevents the lower level branch pipe from being applied with an excessive pressure. The specification range of the water discharge pressure in the sprinkler fire extinguishing equipment is 0.1 to 1.0 MPa, and the water discharge amount is defined to be 80 L / min or more. Although the pressure reducing valve has lowered the pressure so that the downstream part of the branch pipe does not exceed the specification range of water discharge pressure in the sprinkler fire extinguishing equipment, it is not set to the limit of 0.1MPa for building and equipment design, and a margin is provided. It is assumed that the pressure was given. However, the performance of the sprinkler fire extinguishing equipment is such that the flow rate is 179 L / min when the water discharge pressure is 0.5 MPa, and the flow rate is 253 L / min when 1.0 MPa, etc. Water loss had occurred.

  This invention is made in view of the said subject, and it aims at providing the sprinkler fire extinguishing installation which can be adjusted to a suitable pressure in a branch pipe.

In order to solve the above-mentioned subject, in the sprinkler fire extinguishing equipment according to the invention of claim 1, a branch pipe branched from a water supply pipe for supplying water from a fire extinguishing pump is disposed in a protection section, and the downstream side from the upstream side of the branch pipe In a sprinkler extinguishing installation where multiple sprinkler heads are provided along the side,
The end of the branch pipe has a drainage portion for draining water,
The drainage portion includes a pressure sensor for measuring the pressure in the pipe, and a control valve capable of adjusting the amount of water and controlled so that the pressure measured by the pressure sensor during operation of the sprinkler head falls within a predetermined range. It is comprised as having a feature.

  According to the first aspect of the present invention, since the pressure in the branch pipe at the time of water sprinkling is controlled to a more appropriate range than the present, water loss due to excessive pressure can be prevented.

  The sprinkler fire extinguishing equipment according to the invention of claim 2 is characterized in that the water drained by the drainage section is returned to a fire extinguishing water tank which supplies water to the fire extinguishing pump.

  According to the second aspect of the present invention, it is possible to suppress the lowering of the water level of the extinguishing water tank by circulating water, and to prevent the seizure of the extinguishing pump.

  Furthermore, the sprinkler fire extinguishing equipment according to the invention of claim 3 is characterized in that the branch pipe is charged with pressurized water at normal times, and the control valve is in a closed state.

  According to the invention of claim 3, in the wet type sprinkler fire extinguishing equipment, the pressurized state of the branch pipe can be maintained normally, and the pressure adjustment in the branch pipe can be performed by the adjusting valve when a fire occurs.

  Furthermore, in the sprinkler fire extinguishing equipment according to the invention of claim 4, when the pressure measured by the pressure sensor becomes higher than a predetermined value when the control valve is in the closed state, the control valve is activated. It is configured as a feature.

  According to the fourth aspect of the present invention, when the pressure in the branch pipe abnormally increases during normal operation, the pressure can be reduced by the adjusting valve to prevent damage to the pipe and the equipment.

  And the sprinkler fire extinguishing equipment according to the invention of claim 5 is characterized in that the adjusting valve is controlled so that the pressure measured by the pressure sensor is in the range of 0.1 to 1.0 MPa. ing.

  According to the fifth aspect of the present invention, the pressure in the branch pipe in the spouting can be properly maintained.

  The sprinkler fire extinguishing equipment according to the invention of claim 6 is characterized in that the sprinkler fire extinguishing equipment includes water discharge pressure changing means capable of remotely changing the pressure controlled by the adjusting valve.

  According to the sixth aspect of the present invention, the pressure of the water discharge can be changed from the fire alarm system, the control panel for fire extinguishing, etc. according to the scale and condition of the fire, and the water discharge amount can be adjusted.

  ADVANTAGE OF THE INVENTION According to the sprinkler fire extinguishing installation which concerns on this invention, it can adjust to the appropriate pressure in the branch pipe of each floor, and can prevent a water loss.

It is a block diagram of the wet sprinkler fire extinguishing system which is 1st Embodiment. It is a block diagram of the pre-operation type sprinkler fire extinguishing installation which is 2nd Embodiment.

  Embodiments of the present invention will be described in detail with reference to the drawings. In FIG. 1, the block diagram of the wet sprinkler fire-extinguishing installation which is 1st Embodiment is shown. As shown to this figure, the fire extinguishing pump 1 is installed in pump rooms, such as a basement floor of a building. The fire extinguishing pump 1 is driven by a motor 2. The motor 2 is controlled by the pump control panel 3. The extinguishing pump 1 driven by the motor 2 sucks in extinguishing water from the extinguishing water tank 4 and supplies pressurized extinguishing water to the water supply pipe 5. The water supply pipe 5 is disposed along the height direction of the building.

  The pump chamber is provided with a pressure tank 6 having a pressure switch 6 a for activating the extinguishing pump 1. The pressure switch 20 outputs a pressure reduction detection signal to the pump control board 3 when the pressure in the water supply pipe 5 becomes lower than a predetermined pressure. The pump control board 3 which received the pressure reduction detection signal controls to start the operation of the motor 2 and starts the extinguishing pump 1.

  From the water supply pipe 5 disposed along the height direction of the building, a branch pipe 10 is drawn out for each protection section. The protected sections are set, for example, by the floors of the building. The lower branch pipe 10 in the figure is provided on the lower floor of the building, and the upper branch pipe 10 in the drawing is provided on the upper floor than the floor on which the lower branch pipe 10 is provided.

  The branch pipe 10 is provided with a plurality of sprinkler heads 12 along the length direction. In the present embodiment, the sprinkler head 12 is closed. A water flow detection device 11 is provided upstream of the branch pipe 10. The water flow detection device 11 can detect the flow of water in the branch pipe 10. Further, a pressure reducing valve 17 is provided on the upstream side of the water flow detection device 11.

  Water pressurized by the fire extinguishing pump 1 is charged with water from the fire extinguishing pump 1 to the pressure reducing valve 17, and pressurized water with the pressure reduced by the pressure reducing valve 17 fills the water from the pressure reducing valve 17 to the sprinkler head 12 It is done. When the sprinkler head 12 is opened by the heat of the fire and the fire extinguishing water is sprinkled, the pressure on the secondary side of the flowing water detection device 11 decreases, and pressurized water flows in from the primary side of the flowing water detection device 11. When the inflow of pressurized water exceeds a predetermined value, the flowing water detection device 11 detects the resulting water flow. The water flow detection device 11 is connected to the fire receiver 20 installed in the building, and transmits a water flow detection signal to the fire receiver 20 when the water flow is detected. The fire receiver 20 having received the water flow detection signal performs operations such as fire indication and alarm notification. Even when the sprinkler head 12 is not in operation, pressurized water flows in from the primary side of the flowing water detection device 11 when the pressure on the secondary side of the flowing water detection device 11 decreases, but the flow rate is very small. There is no way to detect

  The end of the branch pipe 10 is a drainage portion 13 for draining water, and the drainage portion 13 is connected to the drainage pipe 16. The drainage pipe 16 drains the water to the extinguishing tank 4. For this reason, the water not sprayed from the sprinkler head 12 in the branch pipe 10 is returned from the drainage portion 13 to the extinguishing water tank 4 through the drainage pipe 16. That is, the extinguishing water circulates in the sprinkler extinguishing system. As a result, even when the water sprinkling is continued for a long time, the lowering of the water level of the extinguishing water tank 4 can be suppressed, and the seizing due to the water being not supplied to the extinguishing pump 1 can be prevented.

  The drainage portion 13 is provided with a pressure sensor 14 for detecting the pressure in the pipe and a control valve 15 composed of a solenoid valve capable of adjusting the amount of water in the pipe. The pressure sensor 14 is connected to the control valve 15 and the fire receiver 20. The control valve 15 is normally closed and maintains the inside of the branch pipe 10 in a pressurized state. During operation of the sprinkler head 12, the control valve 15 controls the amount of water in the pipe based on the pressure measured by the pressure sensor 14.

  Next, the operation of the sprinkler extinguishing system at the time of fire will be described. As described above, pressurized water is filled in the piping from the fire extinguishing pump 1 to the sprinkler head 12 at normal times before a fire occurs. When a fire occurs, the hot air stream causes the sprinkler head 12 to open and water sprinkling starts. As a result, when the pressure in the pipe decreases, the pressure switch 6a provided in the pressure tank 6 operates to start the extinguishing pump 1.

  Further, when the water sprinkling by the sprinkler head 12 is started, the flowing water detection device 11 of the branch pipe 10 detects the flow of water and transmits a flowing water detection signal to the fire receiver 20. The fire receiver 20 that has received the water flow detection device 11 performs an operation at the time of a fire occurrence, such as an alarm notification, and the adjustment valve 15 provided in the protected area where the water flow detection device 11 transmits the water flow detection signal. On the other hand, it sends a start signal.

  The adjustment valve 15 that has received the start signal controls the amount of water in the drainage section 13 so that the pressure falls within a predetermined range based on the information of the pressure sent from the pressure sensor 14 at predetermined intervals. The control here is performed so that the pressure in the pressure sensor 14 is in the range of 0.1 to 1.0 MPa. As a result, the water pressure is properly maintained throughout the branch pipe 10, and water loss caused by excessive pressure can be prevented. The water that has passed through the adjusting valve 15 is returned to the extinguishing water tank 4 through the drain pipe 16. The range of pressure controlled by the adjusting valve 15 is preset. The range of this pressure may be set and changed remotely by means of water discharge pressure changing means such as a fire alarm system or a control panel for fire extinguishing. Thereby, according to the scale and condition of a fire, the pressure of water discharge can be changed and the amount of water discharge can be adjusted.

  The control valve 15 is normally in a closed state, but may operate when the pressure in the branch pipe 10 rises. In particular, in summer or winter when the temperature change per day is large, the pressure in the pipe is likely to rise due to the thermal expansion of the water in the pipe. The pressure sensor 14 normally measures the pressure in the pipe at predetermined intervals and transmits the pressure to the fire receiver 20. The fire receiver 20 determines whether the pressure measured by the pressure sensor 14 exceeds a predetermined value, for example, 1.0 MPa, and when it exceeds, transmits a start signal to the adjusting valve 15 . The control valve 15 that has been started is in an open state, and the pressure in the pipe is reduced. When the pressure in the pipe drops below a predetermined level, the control valve 15 is closed to maintain the pressure in the branch pipe 10. By this operation, even when the pressure in the branch pipe 10 becomes abnormal high pressure under normal conditions, the pressure can be reduced to an appropriate pressure by the control valve 15, thereby preventing damage to the device, leakage from piping, etc. can do.

  Although the wet sprinkler fire extinguishing equipment provided with the pressure reducing valve 17 has been described in the present embodiment, the pressure reducing valve 17 may not be provided. For example, the secondary side pressure of the water flow detection device 11 is controlled by the control valve 15 so as not to exceed 1.0 MPa which is the maximum value of the specification pressure range of the sprinkler extinguishing equipment in the monitoring state. The pressure value of the side of the side where the pressure is lowest can be designed to be a predetermined pressure value that is higher than, but not significantly exceeded, the discharge pressure during operation of the sprinkler head 12. Thus, in a system in which the primary side pressure of the water flow detection device 11 does not exceed the control pressure at the time of monitoring by the adjustment valve 15, the water flow detection device 11 does not generate water flow. In addition, even if there is a system in which the primary pressure of the water flow detection device 11 exceeds the secondary pressure, the fire extinguishing water supplied from the primary side to the secondary side of the water flow detection device 11 is As a result, there is no consumption of firefighting water. In addition, when the water flow detection device 11 outputs a water flow detection signal by the operation of the sprinkler head 12, the pressure adjustment value of the adjustment valve of the system is set to a predetermined value in the range of 0.1 to 1.0 MPa. Thus, it is possible to set the discharge pressure to a predetermined value that does not cause water loss.

  As described above, by providing the sprinkler extinguishing system without the pressure reducing valve, it is possible to omit the gate valve, the strainer, etc. in addition to the pressure reducing valve, leading to cost reduction and a space for installation. It can be reduced.

  Although the embodiments described so far are wet sprinkler fire extinguishing equipment, the present invention can be applied to other types of sprinkler fire extinguishing equipment. Next, an embodiment in which the present invention is applied to a pre-actuated sprinkler extinguishing system will be described. In FIG. 2, the block diagram of the pre-operation type sprinkler fire extinguishing installation which is 2nd Embodiment is shown. Also in the sprinkler fire extinguishing system of this embodiment, the fire extinguishing pump 30, the motor 31, the pump control panel 32, the fire extinguishing water tank 33, the pressure tank 35, and the pressure switch 35a are provided in the pump chamber. In addition to these, a vacuum pump unit 36 is provided in the pump chamber.

  The fire extinguishing pump 30 is connected to a water supply pipe 34, a branch pipe 40 branches from the water supply pipe 34 for each protection section, and the branch pipe 40 is provided with a negative pressure flow water detection device 41 and a plurality of sprinkler heads 42. The vacuum pump unit 36 is connected to the suction pipe 50. Similar to the water supply pipe 34, the suction pipe 50 is disposed along the height direction of the building, and is connected to the position downstream of the negative pressure flow water detection device 41 of each branch pipe 40 through the orifice solenoid valve 51. Ru.

  In the protected area, a fire detector 47 is provided along with the sprinkler head 42. The fire detector 47 and the sprinkler head 42 are both connected to the fire receiver 60. In addition, the negative pressure flow water detection device 41 is also connected to the fire receiver 60.

  The pressure sensor 44 and the adjustment valve 45 are provided in the drainage part 43 which comprises the terminal part of the branch pipe 40 similarly to previous embodiment. The pressure sensor 44 is connected to the control valve 45 and the fire receiver 60. In addition, the drainage portion 43 is connected to the drainage pipe 46, and the drainage pipe 46 can drain the fire extinguishing water tank 33. Although the range of the pressure controlled by the adjusting valve 45 is set in advance, it may be set and changed remotely by the water discharge pressure changing means as described above.

  In the present embodiment, pressurized water is charged from the extinguishing pump 30 to the negative pressure flowing water detection device 41. On the other hand, negative pressure water is charged downstream of the negative pressure flowing water detection device 41 of the branch pipe 40. Further, the orifice solenoid valve 51 has a monitoring unit that monitors the negative pressure state in the branch pipe 40. The orifice solenoid valve 51 is opened when it detects that the pressure in the branch pipe 40 has risen due to the breakage of the branch pipe 40 or the malfunction of the sprinkler head 42 or the like, and the pipe is moved by the vacuum pump unit 36 via the suction pipe 50. Is sucked. Thereby, when breakage of the branch pipe 40 or an erroneous operation of the sprinkler head 42 or the like occurs, the water leakage can be minimized.

  When the fire detector 47 detects the occurrence of a fire, a fire occurrence signal is transmitted to the fire receiver 60. The fire receiver 60 that has received the fire occurrence signal issues an alarm or the like, releases the negative pressure control of the negative pressure flow water detection device 41, and opens the valve. Thus, the pressurized water of the water supply pipe 34 is supplied to the branch pipe 40. The pressure switch 35a detects a pressure drop in the water supply pipe 34 associated therewith, and the extinguishing pump 30 is activated. When the heat of the fire opens the sprinkler head 42, watering is started.

  Also, the fire receiver 60 that has received the fire occurrence signal transmits a start signal to the adjustment valve 45 provided in the protected area where the fire detector 47 that has sent the fire occurrence signal is located. The adjusting valve 45 that has received the start signal receives the amount of water in the drainage portion 43 so that the pressure falls within the range of 0.1 to 1.0 MPa based on the information of the pressure sent from the pressure sensor 44 at predetermined intervals. Control.

  As described above, in both the wet type and the pre-actuated type, by providing the adjusting valve controlled by the pressure measured by the pressure sensor in the drainage portion of the branch pipe of the sprinkler fire extinguishing facility, the branch pipe is branched even without providing the pressure reducing valve. Since the pressure in the pipe is controlled to an appropriate range, water loss due to excessive pressure can be prevented. In addition, by draining the water drained from the drainage section to the extinguishing water tank, it is possible to suppress the lowering of the water level of the extinguishing water tank and to prevent the seizure of the extinguishing pump.

  As mentioned above, although embodiment of this invention was described, application of this invention is not limited to these embodiment, It can be variously applied within the range of the technical thought.

  The present invention can also be applied to sprinkler fire extinguishing systems of types other than those described in the above embodiments. For example, when the branch pipe is filled in advance and the sprinkler head operates to operate the water flow detection device, when the sensor in the water discharge section of the fire alarm system is not operating, the shutoff valve corresponding to that section The present invention can also be applied to a sprinkler fire extinguishing system having a wet pre-operation valve that shuts off to stop water discharge.

  Also, the sprinkler fire extinguishing system has an open sprinkler head that opens the simultaneous release valve and the remote control valve of the protection section and discharges water from the sprinkler head normally when the sprinkler head side is not filled with water and a fire is detected. The present invention is also applicable to In this case, the pressure is set higher on the primary side of the simultaneous release valve and the remote control valve, and the adjustment pressure near the sprinkler head appropriately adjusts the discharge pressure to reduce the possibility of pressure shortage. It is possible to prevent the loss.

DESCRIPTION OF SYMBOLS 1 fire extinguishing pump 2 motor 3 pump control panel 4 fire extinguishing water tank 5 water supply pipe 6 pressure tank 6a pressure switch 10 branch pipe 11 water flow detection device 12 sprinkler head 13 drainage part 14 pressure sensor 15 control valve 16 drainage pipe 17 pressure reducing valve 20 fire receiver Reference Signs List 30 fire extinguishing pump 31 motor 32 pump control panel 33 fire extinguishing water tank 34 water supply pipe 35 pressure tank 35 a pressure switch 36 vacuum pump unit 40 branch pipe 41 water flow detection device 42 sprinkler head 43 drainage portion 44 pressure sensor 45 control valve 46 drainage pipe 47 fire detection 50 suction pipe 51 orifice solenoid valve 60 fire receiver

Claims (6)

In a sprinkler fire extinguishing system, a branch pipe branched from a water supply pipe for supplying water from a fire extinguishing pump is disposed in a protection section, and a plurality of sprinkler heads are provided along the upstream side to the downstream side of the branch pipe.
The end of the branch pipe has a drainage portion for draining water,
The drainage portion includes a pressure sensor for measuring the pressure in the pipe, and a control valve capable of adjusting the amount of water and controlled so that the pressure measured by the pressure sensor during operation of the sprinkler head falls within a predetermined range. Sprinkler fire extinguishing equipment characterized by having.   The sprinkler fire extinguishing equipment according to claim 1, wherein the water drained by the draining part is returned to a fire extinguishing water tank which supplies water to the fire extinguishing pump.   The sprinkler fire extinguishing equipment according to claim 1 or 2, wherein pressurized water is charged into the branch pipe at normal times, and the control valve is in a closed state.   The pressure regulating valve is activated when the pressure measured by the pressure sensor becomes a predetermined value or more when the pressure regulating valve is in the closed state. Sprinkler fire extinguishing equipment.   The sprinkler fire extinguisher according to any one of claims 1 to 4, wherein the control valve is controlled such that the pressure measured by the pressure sensor is in the range of 0.1 to 1.0 MPa. Facility.   The sprinkler fire extinguishing equipment according to any one of claims 1 to 5, wherein the sprinkler fire extinguishing equipment has a water discharge pressure changing means capable of remotely changing the pressure controlled by the adjusting valve.

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