JP7135248B2 - Water flow detector and fire extinguishing equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water flow detection device installed on fire extinguishing equipment piping.

Fire extinguishing equipment, such as sprinkler equipment and foam fire extinguishing equipment, has a water flow detection device installed on the pipe leading from the water source to the sprinkler head (or foam head). The water flow detection device has a check valve structure and allows water to flow only in one direction from the water source to the sprinkler head. The water filled inside the secondary pipe, where the sprinkler head is installed, expands and contracts due to seasonal temperature differences. Especially in summer, the water in the secondary pipe expands and the pressure rises, which may damage the sprinkler head. In winter, when the water in the secondary side pipe freezes and the volume expands, the water in the pipe is compressed and the pressure rises, which may cause damage similar to the above.

Conventionally, in order to prevent the sprinkler head from being damaged due to the abnormal pressure rise, there are cases where a manager or an inspector periodically checks the pressure of the secondary side pipe. When the pressure is excessively high, the water in the secondary side pipe is discharged and the pressure value is adjusted so that it falls within an appropriate range. However, due to the lack of personnel in recent years and the movement to improve work efficiency, there are some sites where there is not enough manpower or time to check the pressure of the secondary side piping.

On the other hand, in Patent Literature 1, a bypass flow path that bypasses the primary side and the secondary side of the flowing water detection device is installed, and a differential pressure valve (relief valve) is installed on the bypass flow path. The differential pressure valve opens when the pressure on the secondary side becomes higher than the pressure on the primary side by a predetermined value or more, allowing water to escape from the secondary side pipe to the primary side pipe, thereby preventing damage to the sprinkler head.

JP-A-8-131574

In the running water detection device of Patent Document 1, when the bypass channel is clogged with dust, the original function cannot be exhibited, and there is a possibility that the abnormal pressure rise state of the secondary side pipe cannot be resolved. Alternatively, if you want to remotely monitor the pressure in the secondary piping, you will need a separate pressure switch, monitoring device, and wiring to connect these devices. construction is required.

Therefore, in the present invention, in view of the above problems, it is easy to install a device that can remotely monitor abnormal pressure rise in the secondary side piping, and in the event of an abnormality, a flowing water that can output a signal to a fire display panel installed in the janitor's room or the like. It is intended to provide detection equipment and fire extinguishing equipment.

In order to achieve the above object, the present invention provides the following running water detection device.
That is, a tubular main body connected to the fire extinguishing equipment piping, a valve body with a check valve structure provided inside the main body, and a first valve connected to the fire indicator panel and closing the contact when water flow is detected due to the opening of the valve body. and a switch, wherein the interior of the main body is divided into a primary chamber and a secondary chamber by a valve body, a pressure detector is connected to the secondary chamber, and the pressure detector is connected to the secondary chamber. It has a second switch that opens the contact when the pressure exceeds a predetermined value, the signal line of the second switch is connected in parallel with the signal line of the first switch, and the second switch and the terminating resistor are connected in series. did.

The signal line of the first switch of the running water detection device is connected to a fire display panel installed in a janitor's room or the like, and is constantly monitored. When the pressure in the secondary chamber reaches a predetermined pressure or higher, the contact of the second switch is opened. Then, the signal line between the running water detector and the fire display panel becomes disconnected, and the fire indicator panel outputs a display indicating the disconnection and a warning sound for the disconnection of the flowing water detection device that has detected the disconnection. In response to this, the manager goes to the installation location to check the disconnection state of the running water detection device, and checks the pressure gauge installed in the secondary chamber of the running water detection device. If the pressure in the secondary chamber is higher than the normal operating range, open the drain valve to remove water from the secondary chamber until the pressure returns to the normal operating range. If the pressure in the secondary chamber is within the normal operating range, suspect disconnection and check the signal line.

The above configuration can be realized by simple wiring work of connecting the second switch and the terminating resistor to the signal line of the existing first switch, and the existing wiring from the water detection device to the fire indicator panel can be used as it is. . Therefore, the monitoring system can be provided with a simple configuration and at low cost.

In the above-mentioned flowing water detection device, it is also possible to install a relief valve on the bypass pipe connecting the primary chamber and the secondary chamber. The relief valve opens when the pressure in the secondary chamber exceeds a predetermined value with respect to the pressure in the primary chamber. More specifically, the relief valve opens when the pressure in the secondary chamber is 0.3 to 0.4 MPa higher than that in the primary chamber. In the pressure detector, when the pressure in the secondary chamber exceeds a predetermined pressure, the contact of the second switch is opened, and an indication such as disconnection is output to the fire display panel, but when the relief valve is opened, the secondary Since the pressure in the chamber drops, the contact of the second switch returns to its original position and the disconnection state is resolved. By continuously monitoring the disconnection detection signal of the fire display panel, the pressure state of the secondary chamber can be grasped.

If the pressure detector with the second switch installed is installed near the water flow detection mechanism where the first switch is installed, the signal line of the second switch can be easily connected to the terminal block of the water flow detection mechanism.

Further, according to the present invention, as a fire extinguishing system in which the water flow device is installed, the primary chamber of the water flow detection device is connected to a primary side pipe connected to a water source, and the secondary chamber is a secondary side where a sprinkler head is installed. It can be configured by connecting with piping.

Alternatively, the flowing water detection device has a primary chamber connected to a primary side pipe connected to a water source and a tank filled with a fire extinguishing agent, and a secondary chamber connected to a secondary side pipe connected to the primary side of a simultaneous release valve. It can be applied to foam fire extinguishing equipment with a foam head installed on the secondary side of the simultaneous release valve.

According to the present invention, the pressure detector can detect an abnormal increase in pressure in the secondary chamber of the water flow detection device and the secondary pipe connected thereto, and the signal line of the pressure detector is connected to the water flow detection mechanism of the water flow detection device. connected. With this simple configuration, the signal from the pressure detector is transmitted to the fire indicator panel via the water flow detection mechanism, enabling remote monitoring of abnormal pressure rise in the secondary side piping.

1 is a piping system diagram of a sprinkler system to which the present invention is applied; FIG. BRIEF DESCRIPTION OF THE DRAWINGS The front view of the water detection apparatus of 1st Embodiment. FIG. 3 is a plan view of the running water detection device of FIG. 2; The front view of the state which removed the cover of the running water detection apparatus of FIG. FIG. 3 is a wiring diagram of a terminal block of the running water detector of FIG. 2; The front view of the water detection apparatus of 2nd Embodiment. The piping system diagram of the foam fire extinguishing equipment to which the present invention is applied.

First embodiment (Figs. 1 to 5)
The present invention will be described below with reference to the drawings. The fire extinguishing equipment shown in FIG. 1 is a sprinkler equipment, and includes a water source W, a pump P, a primary side pipe 1, a secondary side pipe 2, a water flow detector 3, and a sprinkler head S.

The water source W is a water tank in which water used for fire extinguishing is stored, and is generally installed in the basement of a building. A pump P is installed near the water source W, and the pump P can send water from the water source W to the primary side pipe 1 .

A water flow detection device 3 is installed in the primary side pipe 1 . A water flow detection device 3 is installed for each protection area. Therefore, the primary pipe 1 is branched on the way, and a plurality of water flow detection devices 3 are installed on the branch pipe. The flowing water detection device 3 will be explained.

A pressure tank T is installed between the water flow detection device 3 and the pump P, and the pressure tank T is installed with a pump start switch 5 . The pump start switch 5 is actuated to start the pump P when the pressure in the primary side pipe 1 falls below a predetermined pressure. A drain valve 8 is installed in the primary pipe 1 .

The running water detection device 3 shown in FIGS. 2 to 4 includes a valve body 32 having a swing check structure inside a cylindrical main body 31, and is partitioned into a primary chamber and a secondary chamber by the valve body 32. As shown in FIG. The valve body 32 is disk-shaped and is normally closed, allowing only water to flow from the primary side pipe 1 to the secondary side pipe 2 .

The water flow detection device 3 is an actuated valve type water flow detection device that detects displacement due to the opening of the valve body 32 and outputs a signal. Specifically, the stem 32a connected to the water flow detection mechanism 31b installed outside the main body 31 is displaced along with the opening operation of the valve body 32, and the displacement is detected by a limit switch (not shown) provided in the water flow detection mechanism 31b. A signal is sent to the fire display panel C upon detection by (first switch). Examples of the running water detection device having such a structure are described in JP-A-2010-5429 and JP-A-2016-135451. A detailed description of the structure of the running water detection device 3 is omitted here.

The running water detection device 3 is provided with an opening covered with a cover 31a on the front side. A water flow detection mechanism 31b is arranged on one side of the water flow detector 3, and a drain valve 31c is arranged on the other side thereof.

Pipes 34 and 35 are installed on the front side of the main body 31 . The pipe 34 is connected to a hole 34a provided in the main body 31 closer to the primary pipe 1 than the valve body 32, and the pipe 35 is connected to a hole provided in the main body 31 closer to the secondary pipe 2 than the valve body 32. 35a.

The tip of the pipe 34 is connected to one end of the elbow joint 36, and a pressure gauge 33 is installed at the connection port of the other end (upper side) of the elbow joint 36 in the figure. On the other hand, the tip of the pipe 35 is connected to a three-way joint 37, and a pressure gauge 33 is installed at the upper connection port of the three-way joint 37 in the drawing. The left connection port of the three-way joint is connected to the pressure sensor 38 .

The pressure detector 38 has a second switch 39, and the second switch 39 is activated when the pressure in the secondary pipe 2 exceeds a predetermined pressure. For example, the second switch 39 operates when the pressure in the secondary pipe 2 is 1.3 MPa or higher. The second switch 39 is of the b-contact specification, and the contacts inside the second switch 39 are normally closed, and the contacts open when activated. A second switch 39 is connected in series with a terminating resistor 40 .

A signal line 41 of the pressure detector 38 is led into the water flow detection mechanism 31b, and is connected to a terminal block 42 of the water flow detection mechanism 31b as shown in FIG. The signal line 41 is connected in parallel with a limit switch (first switch) in the running water detection mechanism 31b. The limit switch (first switch) is of the a-contact specification, and normally the internal contact is in an open state, and the contact closes when activated.

The terminal block 42 is connected to a fire display panel C installed in a janitor's room or the like. The fire display panel C includes a disconnection detection circuit, and a weak current always flows through the signal line 41 . When the second switch 39 is actuated, the weak current does not flow and the wire is broken, and the fire display panel C outputs a display indicating the wire breakage and a warning sound.

In response to this, the manager goes to the installation location to check the water flow detection device 3 for which the display of the disconnected state is output, and confirms the pressure gauge 33 communicating with the secondary side pipe 2 of the water flow detection device 3. do. When the pressure of the secondary side pipe 2 is higher than the normal use range, the water inside the secondary side pipe 2 is drained until the pressure returns to the normal use range by opening the drain valve 31c. If the pressure in the secondary side pipe 2 is within the normal use range, disconnection is suspected, and the conductor between the signal line 41 or the terminal block 42 and the fire display panel C is checked.

As described above, it is possible to grasp from the fire display panel C that the pressure in the secondary side pipe 2 has increased abnormally. In addition, by monitoring the signal indicating disconnection, the pressure state of the secondary side pipe 2 can be grasped. Combining this data with data such as weather, temperature, time, place, etc., it is possible to detect abnormal pressure in the secondary side pipe 2 It may be possible to find the conditions that are likely to occur. The above configuration can be realized simply by connecting the signal line 41 of the pressure detector 38 to the terminal block 42 of the water flow detection mechanism 31b, and the existing wiring from the water flow detection device 3 to the fire display panel C can be used as it is. is.

A plurality of sprinkler heads S are installed in the secondary pipe 2 . The sprinkler head S is a closed sprinkler head in which the nozzles are always blocked by the thermal decomposition part. The structure of the sprinkler head S is already known, and a description thereof is omitted here.

Second embodiment (Fig. 6)
When the above-described pressure detector 38 is applied to a water flow detection device with a relief valve as disclosed in Patent Literature 1, it is possible to monitor an abnormal pressure increase state on the secondary side and the operation of the relief valve caused thereby. As a specific configuration, as shown in FIG. 6, a pressure detector 38 and a relief valve 51 are installed in a bypass pipe 50 that bypasses the primary side and secondary side of the water flow detection device 3 .

Alternatively, the bypass pipe 50 can be installed at another position. For example, the same effect can be obtained by providing a bypass pipe 50 so that one side is connected to the primary side pipe 1 and the other side is connected to the secondary side pipe 2, and a relief valve 51 is installed in the bypass pipe 50. can. Similarly, a bypass pipe 50 and a relief valve 51 may be installed on the back of the main body 31, for example.

The relief valve 51 opens when the pressure in the secondary pipe 2 becomes higher than that in the primary pipe 1 by 0.3 to 0.4 MPa. For example, when the pressure in the primary side pipe 1 and the secondary side pipe 2 is normally 1 MPa, when the pressure in the secondary side pipe 2 becomes 1.3 MPa or more due to abnormal pressure rise, the contact of the second switch of the pressure detector 38 is opened and a display or the like indicating disconnection is output to the fire display panel C.

When the pressure difference between the primary side pipe 1 and the secondary side pipe 2 reaches 0.3 to 0.4 MPa, the relief valve 51 opens and the water inside the secondary side pipe 2 flows into the primary side pipe 1 . As a result, the pressure in the secondary side pipe 2 is lowered, the contact of the second switch 39 is restored, the disconnection state is eliminated, and the display indicating the disconnection of the fire display panel C disappears, and the normal state is restored.

In the above case, when the pressure rises abnormally in the secondary pipe 2, the pressure detector 38 operates first to output a disconnection indication to the fire display panel C, and then the relief valve 51 is opened.

On the other hand, if the bypass pipe 50 is clogged with dust, the relief valve 51 may not function sufficiently when the pressure in the secondary pipe 2 increases abnormally. At that time, a disconnection indication is output to the fire display panel C due to the operation of the pressure detector 38 . When the pressure rises normally abnormally, the relief valve 51 opens and the disconnection display disappears immediately, but if the bypass pipe 50 is clogged with dust, the disconnection display may not disappear or the display may be output intermittently. In this case, the manager goes to the site and checks the pressure gauge 33 communicating with the secondary side pipe 2 of the flowing water detection device 3 that outputs the disconnection output. When the pressure value exceeds the normal use range, the water is drained by opening the drain valve 31c, and the pressure in the secondary pipe 2 is lowered. If the pressure in the secondary pipe 2 is within the normal operating range, disconnection is suspected, and the signal line and the like are checked.

When abnormal pressure rise in the secondary side pipe 2 occurs frequently and the relief valve 51 is opened each time and water moves from the secondary side pipe 2 to the primary side pipe 1, the pressure in the primary side pipe 1 increases. come. For this reason, before the pressure in the primary side pipe 1 reaches the upper limit of the normal use range, the drain valve 8 is manually opened to drain water and lower the pressure in the primary side pipe 1 . Alternatively, a similar effect can be obtained by installing a safety valve that opens when pressure equal to or higher than a predetermined value is installed in the primary side pipe 1 .

The invention described above is applicable not only to sprinkler installations but also to foam fire extinguishing installations. The foam fire extinguishing system shown in FIG. 7 has a water source W and a tank 9a filled with a fire extinguishing agent in the primary pipe, and a mixer 9b for mixing the water from the water source W and the fire extinguishing agent at a constant ratio. A simultaneous open valve 9c is installed in the secondary side pipe 2, and a foam head 9d is installed on the secondary side of the simultaneous open valve 9c. As a modified example of the foam fire extinguishing system described above, the composition of the secondary side piping 2 is changed from the combination of the simultaneous open valve 9c and the foam head 9d to a closed head, and the water flow detector 3 of the present invention is installed in the chemical spray fire extinguishing system. Applicable.

1 Primary piping
2 Secondary piping
3 Flowing water detector
5 Pump start switch
9a chemical tank
9b mixer
9c Simultaneous release valve
9d foam head
31 main body of water flow detection device
32 valve body of water flow detection device
33 pressure gauge
34, 35 Piping
36 elbow joint
37 three-way joint
38 pressure detector
39 second switch
40 terminating resistor
41 signal line
42 terminal block
50 Bypass piping
51 relief valve
P pump
S sprinkler head
T pressure tank
W Water source

Claims (6)

A tubular main body connected to the fire extinguishing equipment piping,
a valve body having a check valve structure provided inside the main body;
a first switch that is connected to the fire indicator panel and that closes the contact when water flow is detected due to the opening of the valve body;
In a running water detection device comprising
The inside of the main body is divided into a primary chamber and a secondary chamber by a valve body, and a pressure sensor is connected to the secondary chamber.
The pressure detector has a second switch that opens the contact when the pressure in the secondary chamber exceeds a predetermined pressure. 2. A water flow detection device characterized by connecting two switches and a terminating resistor in series. 2. The water flow detection device according to claim 1, wherein said water flow detection device has a bypass pipe that communicates the primary chamber and the secondary chamber, and a relief valve is installed on the bypass pipe. 3. The water flow detection device according to claim 1, wherein the signal line of the second switch is connected to the terminal block of the water flow detection mechanism on which the first switch is installed. The water flow detection device according to any one of claims 1 to 3, wherein a pressure gauge and a drain valve are connected to the secondary chamber of the water flow detection device. In the water flow detection device according to any one of claims 1 to 4, the primary chamber is connected to a primary side pipe connected to a water source, and the secondary chamber is a secondary side pipe provided with a sprinkler head. Fire extinguishing equipment characterized by being connected to. In the water flow detection device according to any one of claims 1 to 4, the primary chamber is connected to a primary side pipe connected to a water source and a tank filled with fire extinguishing agent, and the secondary chamber has a simultaneous open valve A fire extinguishing system characterized in that a secondary side pipe connected to the primary side of the is installed, and a foam head is installed on the secondary side of the simultaneous release valve.

Images