JP2010253002A - Negative pressure wet sprinkler system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make the sprinkler equipment monitor pressure at a lower floor equivalent to the monitor pressure at an upper floor by preventing water from being collected within part of the suction pipe also serving as a discharge pipe located below an air/water separator, and within the further lower discharge pipe continued from this suction or discharge pipe. <P>SOLUTION: Water pressure within the secondary-side pipe 7 is maintained to be negative by usually keeping water to be filled up in both of the primary- and secondary-side pipes 6 and 7 of water supply pipe 5, also connecting an end of a branch part 12' at each floor with the rising branch pipe 7a of a secondary-side pipe 7 at each floor, and by means of a negative pressure securing means 17 comprising a suction pipe 12 connected with a sucking device 11 at its other end, an electromagnetic valve 13 provided near the connection of a branch part 12' of suction pipe 12 with the secondary-side pipe 7, a vacuum switch 14, an air-liquid separator 15 provided above the branch part 12' of suction pipe 12 at the uppermost floor, and a discharge pipe 16 connected with the branch part 12' of suction pipe 12 at the lowest floor. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sprinkler system for automatic fire extinguishing of buildings.

  Conventionally, as a sprinkler system for automatic fire extinguishing of buildings, a negative pressure wet sprinkler system as shown in FIGS. 4 and 5 has been proposed and put into practical use.

  The negative pressure wet sprinkler system 100 includes a sprinkler head 101 that operates independently, a water supply device 103 that supplies water in the water storage tank 102 to the sprinkler head 101, and a primary connected to the water supply device 103. Side pipe 104, a secondary side pipe 105 connected to the sprinkler head 101 connected to the branch portion 104 ′ of each floor in the primary side pipe 104, and between the primary side pipe 104 and the secondary side pipe 105. In addition, the water supply pipe 107 that connects the water supply device 103 and the sprinkler head 101, which includes a valve portion 106 that maintains a closed state in a normal state, has a sensing function faster than the sprinkler head 101, and the sprinkler head 101 Fire detection device installed on the same floor that sends a signal when a fire condition is detected 08 and a control unit 109 that controls the operation of the water supply device 103 and the valve unit 106 based on a signal emitted from the fire detection device 108, and the primary side piping 104 and the secondary side piping 104 in the water supply piping 107 are normally connected. While maintaining the state where both the secondary pipes 105 are filled with water, one end side of the branch portion 111 ′ on each floor is connected to the rising branch pipe 105 a of the secondary pipe 105 on each floor, and the other end side is sucked. A suction valve 111 connected to the device 110 and a solenoid valve 112, a vacuum switch 113, and a topmost branch of the suction pipe 111 provided in the vicinity of the connection of the secondary pipe 105 at the branch of the suction pipe 111 A negative pressure state securing means 1 comprising a gas-liquid separator 114 provided at the upper part of 111 'and a drainage pipe 115 connected to the position of the branching part 111' on the lowest floor of the suction pipe 111 6 by those with none to keep this water in the secondary side piping 105 as a negative pressure state. 4 and 5, 117 is a disaster prevention receiving panel that receives a signal emitted from the fire detection device 108 and sends it to the control unit 109, and 118 is provided at the end of the secondary pipe 105. Test valve. In addition, when the symbol of the valve which appears in each figure in the drawing is painted black, it shows a closed state, and when it is not painted, it shows an open state.

  Thus, in the negative pressure wet sprinkler system 100, the primary side pipe 104 is normally filled with pressurized water, and the secondary side pipe 105 is filled with negative pressure water. When the fire detection device 108 detects a fire occurrence state due to smoke, fire, temperature, etc. and sends a signal to the control unit 109, the control unit 109 opens the valve unit 106 and the water supply device 103 starts operating. Then, water is pumped to the secondary side pipe 105 through the primary side pipe 104. Therefore, the water in the secondary side pipe 105 changes from a negative pressure state to a pressurized state, and is in a so-called pre-operation state for preparing the operation of the sprinkler head 101. In this state, when any of the sprinkler heads 101 operates, sufficient water is discharged immediately, and a fire can be prevented to a minimum.

  Furthermore, the negative pressure wet sprinkler system 100 is in a state where the water filled in the secondary side pipe 105 is in a negative pressure state when the sprinkler head 101 is operated when an actual fire does not occur due to a failure or the like. Therefore, it remains in the secondary side pipe 105. That is, even if the sprinkler head 101 malfunctions, water is not accidentally discharged, and it is possible to avoid a situation where the surrounding area is submerged and damaged.

  However, on the other hand, the conventional negative pressure wet sprinkler system 100 has the following problems. That is, when the sprinkler head 101 is broken and is activated at a time other than the actual occurrence of a fire, the suction device 110 operates to maintain the water in the secondary side pipe 105 at a predetermined negative pressure state. However, at this time, both water and air are sucked. However, if the vacuum pump used as the suction device 110 sucks a large amount of water, it becomes overloaded and may be damaged. For this reason, a gas-liquid separation device 114 is provided on the upper part of each branch portion 111 ′ of the suction pipe 111 so that the suction device 110 sucks only air. Further, the separated water is discharged to the water storage tank 102 through a part of a suction pipe that also serves as a drain pipe and a drain pipe 115 that is continuous below the suction pipe. Note that the lower end of the drainage pipe 115 is submerged in the water in the water storage tank 102.

  By the way, the negative pressure means a pressure state lower than the atmospheric pressure. The gauge pressure is 0 to −0.1 MPa, and the water head pressure is about 0 to −10 m. For example, when the pipe with the lower end immersed in the water in the water tank is sucked from the upper end at −0.05 MPa, the water in the water tank is sucked up to a height of about 5 m in the pipe. . This is because the pressure in the pipe is about 5 m lower than the atmospheric pressure by the water head pressure.

  Thus, as described above, the water separated from the air by the gas-liquid separator 114 is discharged to the water storage tank 102 through a part of the suction pipe 111 also serving as a drainage pipe and a drainage pipe 115 continuous below the suction pipe 111. However, since a part of the suction pipe 111 also serving as the drainage pipe and the inside of the drainage pipe 115 continuing to the lower part are in a negative pressure state, a high pressure corresponding to the suction pressure of the suction device 110 is set inside these parts. The water in the water storage tank 102 has been sucked up.

  For example, as shown in FIG. 5, when the suction pressure of the suction device 110 is −0.08 MPa, the water is sucked up to a height of about 8 m from the water level in the water storage tank 102. WL indicates the water level. In this state, if the vacuum switch 113 is installed at a position 5 m lower than the water level WL of the water in the drain pipe 115 continuous with a part of the suction pipe 111 also serving as the drain pipe, the vacuum switch In the vicinity of 113, a water head pressure of 5 m is generated. In other words, even if the monitoring pressure of the vacuum switch 113 installed on the upper floor above the water level WL in the pipe is -0.08 MPa, the vacuum switch installed on the lower floor than the water level in the pipe. In 113, the monitoring pressure is only about -0.03 MPa.

  In addition, since there are building beams, ducts for air conditioning equipment, etc., in the piping of the water supply pipe 107 to the building, the secondary side pipe 105 has a U-shape on the lower side so as to bypass them. In such a case, water head pressure is also generated in the downward bent portion 105 ′, so that the sprinkler head 101 positioned on the end side of the secondary pipe 105 is used. The monitoring pressure in the vicinity of increases further. Accordingly, there is a possibility that the sprinkler head 101 cannot be prevented from being accidentally discharged due to breakage or error of the sprinkler head 101 or damage to the piping. From these facts, it is difficult to deploy a negative pressure wet sprinkler system when the height of the lower floor is particularly low.

  The present invention has been made in view of the above points, and is designed to prevent water from accumulating inside a part of a suction pipe that also serves as a drainage pipe and a drainage pipe that is continuous with the lower part of the suction pipe. The monitoring pressure of the upper floor can be made equivalent to the monitoring pressure on the upper floor, so that the sprinkler head is damaged or malfunctioned, which is a feature of the negative pressure wet sprinkler system, or the piping is damaged. An object of the present invention is to provide a negative pressure wet sprinkler system that can stably obtain the effect of preventing erroneous water discharge regardless of the hierarchy.

  Thus, the gist of the present invention is that a sprinkler head that operates independently, a water feeding device that feeds water in a water storage tank to the sprinkler head, and a primary side connected to the water feeding device. Connected to the branch of each floor of the piping and the primary side piping, the secondary side piping connected to the sprinkler head, and between these primary side piping and the secondary side piping, normally kept closed A water supply pipe that connects the water supply device and the sprinkler head, and has a sensing function faster than the sprinkler head, installed on the same floor as the sprinkler head, and sends a signal when a fire condition is detected And a control unit for controlling the operation of the valve unit based on a signal emitted from the fire detection device. While maintaining the state where both the primary side pipe and the secondary side pipe in the pipe are filled with water, one end side of the branch portion on each floor is connected to the rising branch pipe of the secondary side pipe on each floor, and the other end side An electromagnetic valve, a vacuum switch, and an upper part of the uppermost branch portion of the suction pipe provided in the vicinity of the connection portion between the suction pipe connected to the suction device and the secondary pipe in the branch portion of the suction pipe A negative pressure state securing means comprising a gas-liquid separator and a drain pipe connected to the position of the lowermost branch of the suction pipe makes the water in the secondary side pipe a negative pressure state and maintains it. In the negative pressure wet sprinkler system, an air intake valve is provided in the lower portion of the suction pipe in the vicinity of the gas-liquid separation device, while a check valve is provided in the drain pipe in the vicinity of the water storage tank and the lowest in the suction pipe. On the floor In the negative 圧湿 sprinkler system characterized in that a water level detector in the vicinity bottom of Kibe.

  In the above configuration, the air intake valve may be an automatic valve, and may be automatically opened and closed by a signal from the water level detection device.

  In the above-described configuration, a shutoff valve that shuts off the ventilation in the suction pipe when the air intake valve is opened may be provided between the gas-liquid separation device and the suction device in the suction pipe. In such a case, the shut-off valve may be an automatic valve that automatically opens and closes in conjunction with the opening and closing of the air intake valve.

  Since the present invention is configured as described above, water is not collected in a part of the suction pipe that also serves as the drainage pipe and the drainage pipe that continues to the lower part of the suction pipe. It can be equivalent to the monitoring pressure on the upper floor. Therefore, it is possible to stably obtain the effect of preventing the sprinkler head from being accidentally discharged in the event of sprinkler head breakage or malfunction, or piping breakage, which is a feature of the negative pressure wet sprinkler system. It can be done.

It is a schematic explanatory drawing in the negative pressure wet sprinkler system concerning the present invention. It is a state explanatory view at the time of operation of the suction device. It is a state explanatory view at the time of opening the same air intake valve. It is a schematic explanatory drawing of the conventional negative pressure wet sprinkler system. It is a state explanatory view at the time of operation of the suction device.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  In the figure, 1 is a negative pressure wet sprinkler system. Further, the negative pressure wet sprinkler system 1 includes a sprinkler head, a water supply device, a water supply pipe, a fire detection device, a control unit, and a negative pressure state securing means.

  Reference numerals 2 and 2 denote the sprinkler heads, which are attached to branch pipes of secondary pipes described later disposed on the ceiling of each floor, and are independently operated.

  Reference numeral 3 denotes a water supply device for supplying water in the water storage tank 4 to the sprinkler heads 2 and 2, and a pressurizing pump is used.

  Reference numeral 5 denotes a water supply pipe connecting the water supply device 3 and the sprinkler heads 2 and 2. The water supply pipe 5 is connected to a primary side pipe 6 connected to the water supply device 3, a branch part 6 ′ of each floor in the primary side pipe 6, and a secondary side connected to the sprinkler heads 2 and 2. It consists of the piping 7 and the valve part 8 which was provided between these primary side piping 6 and the secondary side piping 7, and maintains a normally closed state.

  9 and 9 are fire detection devices installed on the same floor as the sprinkler heads 2 and 2 that have a sensing function earlier than the sprinkler heads 2 and 2 and send out a signal when a fire condition is detected. .

  A control unit 10 controls the operation of the valve unit 8 based on signals emitted from the fire detection devices 9 and 9.

  In addition, during normal times, both the primary side pipe 6 and the secondary side pipe 7 in the water supply pipe 5 are maintained in a state of being filled with water, and the secondary branch pipes 7a on each floor are connected to the rising branch pipes 7a on each floor. An electromagnetic valve 13 provided in the vicinity of the connecting portion between the suction pipe 12 connected to one end of the branching section 12 'and the other end connected to the suction device 11, and the secondary pipe 7 of the suction pipe 12. From the vacuum switch 14, the gas-liquid separator 15 provided above the uppermost branch 12 ′ of the suction pipe 12, and the drain pipe 16 connected to the position of the lowermost branch 12 ′ of the suction pipe 12. The negative pressure state securing means 17 serves to maintain the water in the secondary side pipe 7 in a negative pressure state. Reference numeral 18 denotes a test valve provided at the end of the secondary side pipe 7.

  The above configuration is the same as that of the conventional negative pressure wet sprinkler system. Thus, the present invention is characterized in that an air intake valve 19 is provided in the lower portion of the suction pipe 12 in the vicinity of the gas-liquid separator 15, while a check is provided at a position in the vicinity of the water storage tank 4 in the drainage pipe 16. A valve 20 is provided, and a water level detection device 21 is provided in the lower part of the suction pipe 12 near the lowermost branch 12 '.

  The air intake valve 19 is an automatic valve or a manual valve. When the air intake valve 19 is an automatic valve, the air intake valve 19 is automatically opened and closed by a signal from the water level detection device 21. In the present embodiment, a shutoff valve 22 for eliminating the influence of the suction device 11 when the air intake valve 19 is opened is provided between the gas-liquid separation device 15 and the suction device 11 in the suction pipe 12. Provided. The shutoff valve 22 is an automatic valve or a manual valve, and when it is an automatic valve, it automatically opens and closes in conjunction with the opening and closing of the air intake valve 19. Further, the operation of the suction device 11 may be stopped while the air intake valve 19 is opened. Further, as the water level detection device 21, a level switch or a level sensor is preferably used.

  Since the pre-operation in the present invention is the same as that of the conventional negative pressure wet sprinkler system, detailed description will be omitted, and the operation that can obtain the effect of the present invention will be described.

  When the solenoid valve 13 is opened and the suction device 11 is operated in a state where the pressure of the secondary side pipe 7 is increased, the water in the secondary side pipe 7 flows into the drainage pipe 16, and the suction device 11 is turned on as shown in FIG. The water level WL corresponding to the suction force is set.

  When the water level detector 21 is activated, the air intake valve 19 is opened and the shutoff valve 22 is closed as shown in FIG. Further, the operation of the suction device 11 is stopped. As a result, air flows into the drainage pipe 16 and is no longer in a negative pressure state, so water is drained via the check valve 20 according to gravity. At this time, the drain pipe 16 is at atmospheric pressure, but the check valve 23 does not cause the secondary side pipe 7 to be at atmospheric pressure.

  When the water level drops, the air intake valve 19 is closed and the shutoff valve 22 is opened. Further, the operation of the suction device 11 is resumed. If the secondary side pipe 7 is sufficiently in a negative pressure state, the water will not move, and if the water level WL of the drain pipe 16 is lower than the vacuum switch 14, it is appropriate without being affected by the head pressure of the drain pipe 16 Monitoring pressure can be obtained. Finally, the recovery operation is completed by closing the solenoid valve 13.

  Therefore, the monitoring pressure of the sprinkler system in the lower floor can be made equal to the monitoring pressure in the upper floor, and the characteristic effect of the negative pressure wet sprinkler system can be stably obtained regardless of the hierarchy.

  As described above, there are several methods for closing the air intake valve 19 and opening the shut-off valve 22 while waiting for the water level of the drain pipe 16 to decrease. That is, when the water level detection device 21 provided in the lower part of the suction pipe 12 in the vicinity of the lowermost branch 12 'is a single level switch, the air intake valve is opened after the water level is detected. After a predetermined time sufficient for the water level to drop, the air intake valve 19 is closed and the shutoff valve 22 is opened.

  Further, in addition to the upper level switch 21 as a water level detection device provided in the lower part of the suction pipe 12 in the vicinity of the lowermost branch part 12 ', the lower level switch 24 is provided also in the lower part of the drainage pipe 16, thereby The air intake valve is opened by the operation of 21, the air intake valve 19 is closed and the shutoff valve 22 is opened by the restoration of the lower level switch 24, and the state is maintained until the upper level switch 21 is operated next.

  Alternatively, the water level is monitored by a level sensor as a water level detection device. When the water level reaches the same level as the upper level switch, the air intake valve is opened. When the water level drops to the same level as the lower level switch, the air intake valve 19 is closed and shut off. There is a method of opening the valve 22 and maintaining that state until the next water level becomes the same as that of the upper level switch.

DESCRIPTION OF SYMBOLS 1 Negative pressure wet sprinkler system 2, 2 Sprinkler head 3 Water supply apparatus 4 Water storage tank 5 Water supply piping 6 Primary side piping 7 Secondary side piping 8 Valve part 9, 9 Fire detection apparatus 10 Control part 11 Suction apparatus 12 Suction pipe 12 'Branch Part 13 Solenoid valve 14 Vacuum switch 15 Gas-liquid separator 16 Drainage pipe 17 Negative pressure state securing means 19 Air intake valve 20 Check valve 21 Water level detector 22 Shut-off valve 23 Check valve 24 Lower level switch

Claims (4)

  A sprinkler head that operates independently, a water supply device that feeds the water in the water storage tank to the sprinkler head, a primary side pipe connected to the water supply device, and a branch portion of each floor in the primary side pipe The water supply device and the sprinkler head, comprising: a secondary side pipe connected to the sprinkler head, and a valve portion that is provided between the primary side pipe and the secondary side pipe and that normally maintains a closed state. A fire detection device that has a sensing function faster than the sprinkler head and that is installed on the same floor as the sprinkler head and that sends a signal when a fire condition is sensed, and is emitted from the fire detection device And a control unit that controls the operation of the valve unit based on the signal, and normally, water is supplied to both the primary side pipe and the secondary side pipe in the water supply pipe. While maintaining the filled state, a suction pipe in which one end side of the branch part in each floor is connected to the rising branch pipe of the secondary side pipe in each floor and the other end side is connected to a suction device, and a branch of the suction pipe Solenoid valve, vacuum switch, gas-liquid separation device provided above the uppermost branch of the suction pipe, and lowermost branch of the suction pipe In the negative pressure wet sprinkler system in which the water in the secondary side pipe is maintained in a negative pressure state by means of a negative pressure state securing means comprising a drain pipe connected to the position of the drain pipe, the gas-liquid in the suction pipe An air intake valve is provided near the lower part of the separation device, while a check valve is provided near the water storage tank in the drainage pipe and a water level detection device is provided near the lowermost branch of the suction pipe. Special Negative 圧湿 sprinkler system to be.   The negative pressure wet sprinkler system according to claim 1, wherein the air intake valve is an automatic valve, and is automatically opened and closed by a signal from the water level detection device.   3. The negative pressure wet sprinkler system according to claim 1, wherein a shut-off valve is provided between the gas-liquid separation device and the suction device in the suction pipe to shut off ventilation in the suction pipe when the air intake valve is opened. 4. The negative pressure wet sprinkler system according to claim 3, wherein the shut-off valve is an automatic valve and automatically opens and closes in conjunction with opening and closing of the air intake valve.

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