JP2008006086A - Running water sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To permit the presence of running water in a pipe to be accurately sensed. <P>SOLUTION: In a preliminary operation type sprinkler equipment having a control board 12 having the function of opening and closing the primary side 3 and the secondary side 4 of a pipe by a control valve 1 on the basis of a signal from a fire alarm 8, a water pipe 11 opening in the secondary side 4 pipe, and is provided with a pressure switch 10 and a signal stop valve 20 are provided in the water pipe 11. The signal stop valve 20 is operated by the control board 12 and opens and closes the water pipe 11, interlocking with the opening and closing of the pipe by the control valve 1. If the control valve 1 keeps closed, the signal stop valve 20 is also closed and water pressure in the pipe is not introduced into the pressure switch 10. If the control valve 1 is opened, and the signal stop valve 20 is also opened, the hydraulic pressure of water supplied from the primary side 3 to the secondary side 4 is introduced into the pressure switch 10, which senses the running water. Since the water pipe 11 is opened and closed by the signal control valve 20, interlocking with the control valve 1, the running water sensor can accurately sense the presence of the running water without being influenced by the corrosion or the like of the valve 2 and a valve seat. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a flowing water detection device used in a fire extinguishing sprinkler facility.

  In general, the water flow detection device used for fire extinguishing sprinkler equipment is installed in the middle of a pipe leading to the sprinkler head installed on the ceiling of the building, and the sprinkler equipment is activated by detecting the water flowing in the pipe. The purpose is to send a predetermined alarm indicating that the user is doing.

For example, as shown in Patent Document 1, in a wet sprinkler facility, the pipe leading to the sprinkler head is always maintained in a state filled with pressure water, and the sprinkler head is provided with a heat sensitive part and sealed at room temperature. It is in a state.
When a fire occurs and the heat sensitive part melts with heat, the sealed part is opened and water discharge is started. When running water is generated in the pipe due to the water discharge, the valve body of the check valve provided in the middle of the pipe opens, and the flow path of the running water detection device that is blocked by the valve body is opened. Water pressure acts on the alarm device. When the water pressure acts on the alarm device, a predetermined alarm indicating that running water is generated in the pipe is issued.

  In addition, as shown in Patent Document 2, there is also a dry sprinkler facility in which pressurized air is filled on the secondary side with a control valve interposed, and a water flow detection device is provided.

The running water detector is also used for pre-actuated sprinkler equipment.
In pre-actuated sprinkler equipment, when a sensor provided separately from the sprinkler head detects the occurrence of a fire, the control valve is opened, the heat sensitive part of the sprinkler head melts, the seal is opened, and water discharge begins. .
In this way, water discharge is started by opening the control valve and the seal of the heat sensitive part together to prevent erroneous water discharge due to malfunction of the device (see, for example, Patent Document 3). ).
JP 2005-95373 A JP 2003-305137 A JP-A-6-79014

As shown in FIGS. 5 (a) and 5 (b), for example, as shown in FIGS. 5 (a) and 5 (b), the water flow detection device provided in each of the sprinkler facilities is provided with the water guide pipe 11 opened to the valve seat of the control valve 1. The water conduit 11 is closed when the valve body 2 of the control valve 1 comes into contact with the valve seat, and the water conduit 11 is opened when the valve body 2 of the control valve 1 is separated from the valve seat.
The pressure introduced from the inside of the pipe into the pipe 11 when water is supplied from the primary side 3 to the secondary side 4 of the sprinkler pipe with the control valve 1 opened by opening and closing the pipe 11. And the pressure in the water conduit 11 when water is not supplied from the primary side 3 to the secondary side 4 of the sprinkler pipe in the closed state of the control valve 1. Due to the difference, the running water detection device detects the presence or absence of running water in the pipe.

  However, as described above, when the water conduit of the water flow detection device is provided to open to the valve seat of the control valve, the valve body and the valve seat repeatedly contact and separate, so that the valve around the opening of the water conduit The seat may be worn or damaged. If the valve seat or the valve body around the opening is worn or damaged, the water guide pipe cannot be closed in a watertight manner, and the presence or absence of flowing water in the pipe cannot be detected accurately.

  Then, this invention makes it a subject to enable it to detect the presence or absence of the flowing water in piping correctly.

  In order to solve the above-described problems, the present invention is used in a sprinkler facility that opens and closes a primary side and a secondary side of a pipe by a control valve, and a water guide pipe that opens in the pipe on the secondary side is provided. In the water flow detection device, in which a pressure switch is provided in the water conduit, and the pressure switch detects the presence or absence of water flowing from the primary side to the secondary side by the water pressure in the water conduit, the opening of the water conduit into the pipe and the pressure A configuration in which a signal stop valve that opens and closes the conduit pipe in conjunction with opening and closing of the pipe by the control valve is provided between the switch and the switch.

According to this configuration, when the control valve is closed, the signal stop valve of the water conduit is also closed in conjunction. Further, when the control valve is opened, the signal stop valve of the water conduit is also opened. That is, if the control valve is closed, the signal stop valve is also closed, and the pressure in the pipe is not introduced into the pressure switch. If the control valve is open, the signal stop valve is also opened, water is supplied from the primary side to the secondary side of the sprinkler pipe, and the water pressure is introduced into the pressure switch through the water conduit.
Since the water conduit is opened and closed by a signal stop valve that is linked with the opening and closing of the control valve, the running water detector can accurately detect the presence or absence of running water without being affected by the wear of the valve body or valve seat. Become.
In addition, the pressure acting on the pressure switch through the water conduit is significantly different between the closed state and the open state of the control valve by opening and closing the signal stop valve. For this reason, there exists an effect that the detection of the presence or absence of flowing water is further accurate.

In this configuration, the sprinkler facility is a pre-actuated sprinkler facility having a control panel having a function of operating the control valve based on a signal from a fire alarm, and the control panel is formed by the control valve. A configuration in which the conduit pipe is opened and closed by the signal stop valve in conjunction with opening and closing of the pipe may be employed.
Pre-actuated sprinkler equipment has a mechanism that opens and closes a control valve based on a signal from a fire alarm, that is, a control panel, a control panel and a fire alarm, and a circuit that connects the control panel and the control valve. Therefore, if the opening / closing operation of the signal stop valve is controlled by the same mechanism, the signal stop valve can be opened / closed in conjunction with the opening / closing operation of the control valve. In this way, the configuration of the apparatus can be simplified by electrically interlocking the opening / closing operation of the control valve and the opening / closing operation of the signal stop valve via the control panel and wiring.

The control valve and the signal stop valve are respectively a butterfly valve or a swing valve, and the rotation of the valve shaft of the control valve is transmitted to the valve shaft of the signal stop valve. Therefore, it is possible to adopt a configuration in which the conduit pipe is opened and closed by the signal stop valve interlocked with opening and closing of the pipe by the control valve.
Thus, when the control valve and the signal stop valve are respectively a butterfly valve or a swing valve, the control valve is opened and closed by transmitting the rotation of the valve shaft of the control valve to the valve shaft of the signal stop valve. And the opening / closing operation of the signal stop valve can be mechanically linked.

  In addition, since the structure which opens and closes a water conduit with a signal stop valve was employ | adopted, you may open a water conduit to the position away from the valve body and valve seat of a control valve, and you may make it communicate in piping. Since the restriction on the opening position of the water conduit is reduced, the structure of the control valve can be simplified. Further, if a butterfly valve is employed as the control valve, it is advantageous because it is more compact than a swing valve or a ball valve.

  In the present invention, since a signal stop valve for opening and closing the water conduit is provided between the opening of the water conduit into the piping and the pressure switch, the presence or absence of running water is accurately detected. Can be detected.

One embodiment will be described with reference to FIGS. 1 and 2. This embodiment is a flowing water detection device employed in dry pre-actuated sprinkler equipment.
A control valve 1 in the form of a butterfly valve is provided in the middle of the piping leading to the sprinkler head 7 installed on the ceiling or the like in the building. The sprinkler pipe is filled with air on the secondary side 4 across the valve body 2 of the control valve 1 and with water supplied from the water source 14 by the pump 13 on the primary side 3 at a predetermined water pressure. .
Further, the sprinkler head 7 is provided with a heat sensitive part that melts at a predetermined temperature, and the heat sensitive part hermetically seals the inside of the pipe on the secondary side 4 at room temperature.

  As shown in FIG. 1, the control valve 1 is provided with a water conduit 11 that opens into the valve chamber of the secondary side 4, and the water conduit 11 communicates with a pressure switch 10 provided outside the control valve 1. ing. The pressure switch 10 has a function of detecting a water pressure in the conduit 11 and transmitting a signal to the control panel 12 when the water pressure in the water conduit 11 exceeds a predetermined value.

  In the building, apart from the sprinkler head 7, a fire alarm 8 is also installed on the ceiling or the like. When the fire alarm 8 detects the occurrence of a fire, a signal is sent to the control panel 12 via the wiring 31. To send. The control panel 12 is configured to open the valve body 2 of the control valve 1 via the wiring 33 based on the signal from the fire alarm 8. In the event of a fire, the heat-sensitive part of the sprinkler head 7 melts at the same time and the seal is opened, so that the water that has flowed into the secondary side 4 by opening the control valve 1 pushes out the air that has filled the secondary side 4. At the same time, water discharge is started. Further, the control panel 12 operates the pump 13 via the wiring 32 to supply water from the water source 14 to the pipe.

As shown in FIGS. 2 (a) and 2 (b), the water conduit 11 leading to the pressure switch 10 opens into the valve chamber on the secondary side 4 of the valve box 5 and is provided in the middle of the water conduit 11. The signal stop valve 20 is closed together with the control valve 1 in a normal state.
In the figure, “9” is an on-off valve, “23” is an orifice that ensures the action of water pressure on the pressure switch 10, “15” is a drain pipe that discharges water that has passed through the orifice, and “ 22 "is a signal stop valve. Reference numeral “16” is a communication pipe, and “21” is a test valve.

In the closed state of the control valve 1, water is not supplied from the primary side 3 to the secondary side 4 of the sprinkler piping, and the air pressure filled in the secondary side 4 acts in the water conduit 11. Since the water conduit 11 is closed by the signal stop valve 20, the air pressure does not act on the pressure switch 10.
When the control valve 1 is opened by the signal from the control panel 12 and water flows from the primary side 3 to the secondary side 4 of the pipe, the signal stop valve 20 is simultaneously activated by the signal from the control panel 12 through the wiring 34. The valve is opened. By opening the signal stop valve 20, the water pressure in the valve chamber on the secondary side 4 is introduced into the pressure switch 10 through the water conduit 11. Since the water pressure in the pipe is introduced into the pressure switch 10 through the water conduit 11, the pressure difference caused by the opening and closing of the control valve 1 is conspicuous compared to when the signal stop valve 20 is closed.
Due to this remarkable pressure difference, the pressure switch 10 can accurately detect the presence or absence of water flowing from the primary side 3 to the secondary side 4 by the water pressure in the water conduit 11.

As the control valve 1, in addition to the butterfly valve shown in this embodiment, other types of valve devices such as a swing valve and a ball valve can be employed.
A known pressure sensor may be employed as the pressure switch 10.

  Another embodiment is shown in FIGS. In this embodiment, each of the control valve 1 and the signal stop valve 20 is a butterfly valve, and the opening / closing operation of the control valve 1 and the opening / closing operation of the signal stop valve 20 are mechanically linked.

  In FIG. 3, a gear 26a is provided on the valve shaft 26 of the signal stop valve 20, and a gear 6a is provided on the valve shaft 6 of the control valve 1. The valve shaft 26 of the signal stop valve 20 is provided via the gears 26a, 6a. The rotation of the valve shaft 6 of the control valve 1 is transmitted to the valve.

  Moreover, you may employ | adopt the structure shown in FIG. In this configuration, the valve shaft 26 of the signal stop valve 20 and the valve shaft 6 of the control valve 1 are integrated. When the valve shaft 6 of the control valve 1 rotates, the valve shaft 26 of the signal stop valve 20 rotates with the rotation of the valve shaft 6.

In the above configuration in which the opening / closing operation of the control valve 1 and the opening / closing operation of the signal stop valve 20 are mechanically linked, when the control valve 1 shifts from the closed state to the opened state, the valve shaft 6 of the control valve 1 Is transmitted to the valve shaft 26 of the signal stop valve 20, and the signal stop valve 20 shifts from the closed state to the open state.
When the control valve 1 shifts from the open state to the closed state, the rotation of the valve shaft 6 of the control valve 1 is transmitted to the valve shaft 26 of the signal stop valve 20, and the signal stop valve 20 is also in the open state. To the closed valve state.

  Although each said embodiment showed the structure which installed the flowing water detection apparatus in the dry-type pre-actuated sprinkler equipment, the said flowing-water detection apparatus is applicable also in a dry-type sprinkler equipment, a wet-type sprinkler equipment, or a wet-type pre-actuated-type sprinkler equipment. It is.

The block diagram of the flowing water detection apparatus which shows one Embodiment Explanatory drawing which shows the effect | action of the same embodiment The block diagram of the flowing water detection apparatus which shows other embodiment. The block diagram of the flowing water detection apparatus which shows other embodiment. Configuration diagram showing a conventional water flow detection device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Control valve 2,25 Valve body 3 Primary side 4 Secondary side 5 Valve box 6,26 Valve shaft 7 Sprinkler head 8 Fire alarm 9 On-off valve 10 Pressure switch 11 Water guide pipe 12 Control panel 13 Pump 14 Water source 15 Drain pipe 16 Communication pipe 20, 22 Signal stop valve 21 Test valve 23 Orifice

Claims (3)

The control valve 1 is used in a sprinkler facility that opens and closes the primary side 3 and the secondary side 4 of the pipe. A water conduit 11 that opens in the pipe on the secondary side 4 is provided, and a pressure switch 10 is connected to the water conduit 11. In the flowing water detection device, wherein the pressure switch 10 detects the presence or absence of flowing water from the primary side 3 to the secondary side 4 by the water pressure in the water conduit 11,
A signal stop valve 20 that opens and closes the water conduit 11 in conjunction with opening and closing of the piping by the control valve 1 is provided between the opening of the water conduit 11 into the piping and the pressure switch 10. A featured water detection device.   The sprinkler facility is a pre-actuated sprinkler facility including a control panel 12 having a function of operating the control valve 1 based on a signal from the fire alarm 8, and the control panel 12 is controlled by the control valve 1. The flowing water detection device according to claim 1, which has a function of opening and closing the water conduit 11 by the signal stop valve 20 in conjunction with opening and closing of the pipe.   The control valve 1 and the signal stop valve 20 are each a butterfly valve or a swing valve, and the rotation of the valve shaft 6 of the control valve 1 is transmitted to the valve shaft 26 of the signal stop valve 20, The flowing water detection device according to claim 1, wherein the water conduit 11 is opened and closed by the signal stop valve 20 in conjunction with the opening and closing of the pipe by the control valve 1 by transmission of the rotation.

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