JPH03292968A - Sprinkler head - Google Patents

Abstract

PURPOSE:To utilize effectively a cover plate and give a function of a fire detector to a sprinkler head itself by providing a switch for sending a fire detecting signal with the detection of fall of the cover plate. CONSTITUTION:A sprinkler head 10 receives fire heat and low temperature solder 32 of a synthetic resin piece 33 for attaching a cover plate 30 to a deflector 28 reaches first an operation temperature to be fused so that the cover plate 30 falls down. A switch knob 36 of a microswitch 34 is released from being locked in the turned-off condition by the fall of the cover plate 30. A switch contact, i.e., alarming contact of the microswitch 34 is operated to output a fire detecting signal to a fire receiver 60 which, upon receiving the fire detecting signal from the microswitch 34, generates a fire alarm. Next, the receiver 60 outputs a starting signal to a solenoid valve 46 provided in a pressure reduction actuating piping 44 for a preoperation valve 40 to open the solenoid valve 46.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a sprinkler head that is activated by heat generated by a fire and sprays fire extinguishing water.

[Prior Art] Conventionally, fire extinguishing equipment using sprinkler heads and fire alarm equipment using fire detectors are provided completely separately.

[Problem to be solved by the invention] However, in such fire extinguishing equipment and fire alarm equipment, sprinkler heads and fire detectors must be installed separately, resulting in high equipment costs and installation work. This is complicated, and since both the sensor and the sprinkler head are attached to the ceiling, there is an aesthetically undesirable problem.

The present invention was made in view of these conventional problems, and effectively utilizes the cover plate used in concealed sprinkler heads to provide the sprinkler head itself with the function of a fire detector. It is an object of the present invention to provide a sprinkler head that can

[Means to solve the problem] In order to achieve this object, the present invention is constructed as follows.

The present invention is directed to a sprinkler head having a cover plate that operates and falls at a temperature lower than the operating temperature of the sprinkler head body, ie, a concealed sprinkler head.

According to the present invention, such a sprinkler head is provided with a switching means, for example, a microswitch, on the sprinkler head main body side to detect the fall of the cover plate and send out a fire detection signal.

[Operations] According to the sprinkler head of the present invention having such a configuration, when it receives heat from a fire, the cover plate is first activated and falls, and as the cover plate falls, the previous installed state is removed. For example, a microswitch that was off can be turned on and send out a fire detection signal. Therefore, there is no need to separately provide a fire detector, which is advantageous in terms of equipment cost and installation work, and can be aesthetically pleasing.

[Embodiment] FIG. 1A is a block diagram showing an embodiment of the sprinkler head of the present invention together with a pre-activation type sprinkler equipment.

In FIG. 1A, reference numeral 10 designates a sprinkler head of the present invention, which is mounted in a mounting hole 16 in a ceiling 14 by a mounting bracket 12. The upper part of the sprinkler head body 18 is screwed into the end of the down pipe 22 connected to the branch pipe 20, and a thermal decomposition part 24 is installed in the center of the sprinkler head body 18, and an upper gasket (valve member) 26 is installed.
The water discharge hole is closed in support. The thermal decomposition unit 24 of this embodiment uses a rapid-acting thermal decomposition unit in which a glass tube is filled with a liquid that expands due to a rise in temperature during a fire and causes the glass tube to break at a predetermined operating temperature. There is.

The operating temperature of this rapid-acting thermal decomposition unit 24 is, for example, 74°C.
It is set to ℃.

A deflector 2 is attached to the lower end of the sprinkler head 18.
8 is fixed, and a dish-shaped cover plate 30 is attached to the lower side of the deflector 28.

That is, as shown in FIG. 1B, abbreviated synthetic resin pieces 33 are placed at three locations on the inside of the cover plate 30, and a spring plate 35 is placed between them.
The synthetic resin piece 33 connects the cover plate 30 to the deflector.
Attach it to 28. The operating temperature (melting temperature) of the low-temperature solder 32 is set to be lower than the operating temperature of the sprinkler head main body 18 side, that is, the operating temperature of the thermal decomposition section 24. For example, if the operating temperature of the thermal decomposition unit 24 is 74°C, the operating temperature of the low-temperature solder 32 is set to 68°C.

A sprinkler equipped with such a cover plate 30
In the present invention, a microswitch 34 is attached to the head 10 as shown at the lower right side of the mounting bracket 12, and a cover plate 30 is attached from the tip of the microswitch 34.
A switch knob 36 extends on the inner surface of the microswitch 34, and in the assembled state shown in the figure, the switch knob 36 is pushed into the microswitch 34 side to turn off the internal switch contact.In this state, the low temperature solder 32 is exposed to heat from the fire. The synthetic resin piece 33 comes off due to the force of the spring plate 35 and the cover plate 30 is melted.
When the microswitch 34 is dropped, the switch knob 36 is unlocked and protrudes downward, thereby turning on the switch contact built into the microswitch 34 and outputting a fire detection signal to the receiver 60.

Next, a pre-actuation type sprinkler installation using the sprinkler head 10 of the present invention will be explained.

A pre-action valve 40 is provided in the branch pipe 20 to the sprinkler head 10, and the primary side of the pre-action valve 40 is connected to a fire pump 42. The manual valve 40 is provided with a pressure reduction start pipe 44, and a solenoid valve 46 is connected to this pressure reduction start pipe 44.
and a pressure reduction operated pilot valve 48 are provided in series.

Compressed air is sent from a compressor 50 to the secondary side of the hand-operated valve 40 via a check valve 41, and compressed air is sent to the branch pipe 20, which is the secondary side of the hand-operated valve 40, under steady monitoring conditions. It seals the air.

A pressure switch 52 for detecting pressure reduction is provided in the pipe from the compressor 50, and a switch-on signal at the time of pressure reduction causes a pressure reduction alarm to be issued to notify of damage to the pipe or the like.

The fire pump 42 is operated under control by a pump control panel 54 and supplies fire extinguishing water from the water source 14 under pressure. The pump control panel 54 starts the fire extinguishing pump 42 in response to a pressure reduction detection signal from a pressure switch 58 for starting the pump in a pressure tank 56 provided on the pump discharge side.

On the other hand, a fire detection signal from the microswitch 34 provided in the sprinkler head 1o of the present invention is given to the receiver 60. The receiver 6o is a sprinkler head 10
When a fire detection signal is received from the microswitch 34 provided in the manual valve 10, a fire alarm is issued and a starting signal is output to the solenoid valve 46 provided in the pressure reduction starting pipe 44 of the manual valve 10 to open the solenoid valve 46. Further, if necessary, the receiver 60 can send a signal to the pump control panel 54 to stop the operation of the fire pump 42.

Next, referring to the operation flow diagram of FIG. 2, proceed to step 1A.

The operation of the embodiment shown in FIG. 18 will be explained.

First, if a fire breaks out in the Sl, the sprinkler head 10 receives the heat from the fire, and first the cover plate 3
The low-temperature solder 32 of the synthetic resin piece 33 fixing the 0 to the deflector 28 reaches the operating temperature and melts, causing the cover plate 30 to fall as shown in S2. As the cover plate 30 falls, the off-state lock of the switch knob 36 of the microswitch 34 is released, and the switch contact of the microswitch 34, that is, the alarm contact is activated in S3.
A fire detection signal is output to the fire receiver 60. Upon receiving the fire detection signal from the microswitch 34, the receiver 60
will issue a fire alarm at S4. Subsequently, in S5, the receiver 60 outputs a start signal to the solenoid valve 46 provided in the pressure reduction start pipe 44 of the manual valve 40, thereby opening the solenoid valve 46.

Subsequently, as the cover plate 3o falls, the temperature of the thermal decomposition section 24 of the sprinkler head 10 rises, and when it reaches the operating temperature, the thermal decomposition section 24 self-destructs, and the gasket 26 releases its hold, causing the sprinkler to open. head l
o operates at 86.

Along with such movement of Sl-S6, the fire simultaneously expands as shown in parallel.

When sprinkler head 1o operates in S6, branch pipe 2
The compressed air sealed in the 0 is released, and the pressure reduction in the branch pipe 20 causes the pressure reduction operation type pilot E valve 48 to open at 87.
It will be released in At this time, since the solenoid valve 46 has already been opened by the activation signal from the receiver 60, the reduced pressure starting pipe 44 is opened, and this opening of the reduced pressure starting pipe 44 causes s
At 8, the manual valve 46 is opened.

Since the operation of the hand-operated valve 4o is prohibited by two valves, that is, the solenoid valve 46 and the pressure-reducing pilot valve 48, this is generally known as a double interlock system.

When the hand-operated valve 40 is opened in S8, the pressure inside the primary side piping up to the fire pump 42 is reduced as shown in 89, and this reduced pressure inside the piping is also generated in the pressure tank 56. The pressure switch 58 is actuated at S10, and the pump control board 54 starts the fire pump at Sll. The fire extinguishing water from the water source 14 is supplied under pressure by the fire pump 42 started at sll, and is supplied to the branch pipe 2o through the manually operated valve 40 which is in the open state, and is supplied to the branch pipe 2o from the sprinkler head 1o which is already in the open state at s6. Watered, S1
3 will now extinguish the fire.

In the embodiments shown in FIGS. 1A and 18, the cover plate 30 is fixed to the sprinkler head body side with low-temperature solder 32, but the operating temperature of the sprinkler head body side The same applies to sprinkler heads using shape memory metals that deform and release the cover plate 30 at low operating temperatures.

In addition, although a quick-acting type heat-sensitive decomposition unit 24 in which a working fluid is sealed in a glass tube is taken as an example, this sprinkler head has a heat-sensitive decomposition unit using a mechanical link that is held in a closed state by soldering. Of course, this is also a good thing.

Further, in Fig. 1A and Fig. 18, sprinkler head 1 is shown.
This was an example of a pre-activation type sprinkler system that opens a hand-operated valve in response to a fire detection signal from 0 and reduces the pressure in the piping to the sprinkler head, and then starts a fire pump to supply water under pressure for fire extinguishing purposes. Any suitable sprinkler system using a closed type sprinkler head can be used as a means of detecting fire.

[Effects of the Invention] As explained above, according to the present invention, by providing a switch means for detecting the fall of a cover plate and sending out a fire detection signal, it is possible to operate a sprinkler without installing a separate detector. A fire detection signal can be obtained just by installing the head, equipment costs are low, installation work is easy, and there is no need to separately install a detector, making it aesthetically pleasing.

[Brief explanation of drawings]

1A and 18 are block diagrams of an embodiment of the present invention together with pre-acting sprinkler equipment; FIG.
It is an operation flow diagram of the figure. In the figure, 10 varnish sprinkler head 12: mounting bracket 14: ceiling 16/mounting hole 18 varnish sprinkler head main body (SP main body) 20: branch pipe 22: down pipe 24: thermal decomposition section 26: gasket 28: deflector 30: Cover plate 32: Low temperature solder 34: Micro switch (switching means) 36: Switch knob 40: Hand operated valve 42: Fire pump 44: Decompression start piping 46: Solenoid valve 48: Decompression operated pilot valve 50: Compressor 2 4 6 8 0 Pressure switch (for air pressure reduction alarm) Pump control panel/pressure tank: Pressure switch (for pump start): Receiver

Claims (1)

[Claims] 1. In a sprinkler head equipped with a cover plate that operates and falls at a temperature lower than the operating temperature of the sprinkler head main body, the falling of the cover plate is detected on the sprinkler head main body side. A sprinkler head characterized by being provided with switching means for sending out a fire detection signal.