JPH0467872B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic fire prevention system suitable for hotels, hospitals, etc., which is equipped with an initial fire detector and a simultaneous indoor and outdoor multi-angle water sprayer for extinguishing fires.

[Conventional technology]

Disaster prevention systems that are currently commonly used are:
A fire alarm is issued, followed by evacuation guidance.
Fire extinguishing activities are divided into fire extinguishing activities using fire extinguishers or sprinklers.

A fundamental drawback between the two is that the chronological relationship between fire occurrence, immediate warning issuance, and fire extinguishing activities, which is most important and necessary in the initial stage of a fire, is not closely maintained.

Generally, smoke from a fire creates a layer of air between it and the ceiling, so a certain amount of time has passed and the smoke has reached a high concentration before a fire alarm is activated.

Since this is not enough to respond in time for an emergency, many fire alarm systems tend to detect and alarm when smoke is at a low concentration in order to issue an alarm as soon as possible.

However, according to this, for example, the alarm switch can be triggered by cigarette smoke and there is a possibility of false alarms, so there have been cases where the alarm switch was turned off artificially, causing a disaster.

On the other hand, current sprinklers include open types and closed types. The open type discharges water by manual operation, while the closed type discharges water by melting the melting valve using the heat of the fire.

As an example of the provisions of the Fire Service Act, when the room temperature is less than 39 degrees Celsius, the melting temperature of a melting plug is less than 79 degrees Celsius, but it does not melt immediately at this prescribed melting temperature, and it takes time to absorb the amount of heat required for melting. The fact that the heat of dissolution depends on the amount of heat of the fire means that fire extinguishing activities cannot be carried out for a certain period of time after a fire occurs.

In addition, because conventional sprinklers are installed so that the water discharge angle is directed downwards toward the ceiling, water is discharged indoors, but cannot be discharged to the ceiling or attic, reducing firefighting efforts. ing.

[Problem to be solved by the invention]

Sprinklers are effective in extinguishing fires when the fire is initially weak, so they must be activated and discharge water as soon as a fire breaks out.

Looking at the current state of disaster prevention, there is an urgent social need to realize an automatic disaster prevention system that reliably detects fires and extinguishes fires in the early stages without requiring human operations as a technological challenge. be.

[Means to solve the problem]

This invention was made in view of the above-mentioned conventional circumstances, and its structural features include a smoke density sensor that can distinguish between two types of smoke density, light and dark, a temperature sensor that detects a constant air temperature, and a temperature sensor that detects a constant air temperature. An initial fire detector with a built-in intake fan forcibly drawing in air, a spherical hollow water discharge part that is attached to the ceiling bulkhead and has numerous water discharge holes that can discharge water both into the attic and inside the room, and the same water discharge part. A multi-angle fire extinguishing water spray system that is installed in the pipe that connects the water supply and has a solenoid valve that is activated by a signal from the fire detector, and can simultaneously spray water indoors and at the ceiling when the solenoid valve is activated. It is equipped with a central management control panel that controls alarms in the management room and the building, means for displaying the location of the cause of the fire, air conditioners in the building, and power supplies in the building. When the above-mentioned fire alarm is detected, the alarm in the control room will sound, and the above-mentioned means for indicating the location of the cause of the fire will be flashed, and the fire detector will then detect smoke with a higher concentration than the smoke at the initial stage of the fire. At the same time, if a certain air temperature is detected by the temperature sensor, the in-building alarm is activated, the in-building air conditioner is stopped, the in-building power supply is cut off, and the solenoid valve is turned off. As a first step, the fire is extinguished by spraying water into the ceiling and inside the room from the multi-angle water cannon at the location where the cause of the fire occurred.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In this automatic fire protection system, a water cannon 1 shown in FIGS. 1 to 3 is used. The water discharger 1 includes a water discharge part 1c made of a spherical hollow body made of a combination of hemispheres 1a and 1b, and a large number of water discharge holes 2 are bored in the circumferential surface of the water discharge part 1c.

Mounting flanges 3, 3 are provided at the openings of each hemisphere 1a, 1b, and in this water cannon 1, one hemisphere 1a faces the ceiling through the mounting flange 3, and the other hemisphere 1b is attached to the ceiling partition wall 4 so as to face the room.

This water sprayer 1 is connected to a water supply section (not shown) via a connecting pipe 5 communicating with the upper hemisphere 1a, and the connecting pipe 5 is provided with a solenoid valve 6.

This solenoid valve 6 is operated by a signal from a fire detector 7, which will be described later. That is, when a signal is sent from the fire detector 7, the solenoid valve 6 is opened. As a result, water or fire extinguishing liquid is supplied to the water discharge part 1c through the connection pipe 5 at a constant pressure, and the water or the like is discharged from the water discharge hole 2 to the outside.

The fire detector 7 comprises a casing cap 10 having an intake window 8 and an exhaust window 9, as shown in FIGS. 4 and 5.

Inside the casing cap 10, there is smoke of a certain low concentration and smoke of a certain high concentration, that is, relatively low concentration smoke that occurs at the initial stage of water outflow, and high concentration smoke that becomes denser as the fire progresses. a smoke concentration sensor 11 which has a function of detecting two types of smoke, outputting individual electric signals for each according to the detection state, and stopping the signals individually when the concentration returns to a certain value or less; A temperature sensor 12 that outputs an electric signal when a certain temperature is detected, and an air intake that is driven by a motor M and forcibly takes in the smoke to be detected to stabilize the standard of the smoke concentration and prevent false alarms. A fan 13 is provided.

Next, the operation of the automatic fire protection system of the present invention will be explained with reference to FIG.

When the fire detector 7 in a particular location detects smoke at a relatively low concentration at the beginning of a fire, an alarm buzzer on the central control panel 14 in the control room sounds, and at the same time, a room number lamp indicating the location of the cause of the fire flashes. Start.

Note that if the smoke detected at the initial stage of the fire subsequently falls below a predetermined concentration, the alarm buzzer will stop sounding and the lamp will go out.

As described above, when a relatively low concentration of smoke at the initial stage of a fire is detected, and then a higher concentration of smoke is detected, and when a certain temperature is detected by the temperature sensor 12, the following occurs. The operation is instantaneous.

The alarm buzzer on the central control panel 14 in the control room will sound strongly to notify you of an emergency. At the same time, the room number lamp that indicates the location where the problem occurred changes from flashing to lit.

Then, the solenoid valve 6 at the location where the cause has occurred is opened, and the water sprayer 1 sprays water both into the attic and into the room.

An alarm announcement in the building will inform you of the occurrence of a fire accident.

Air conditioning equipment automatically stops to prevent smoke from spreading.

The power supply to the relevant floor will automatically shut off to prevent secondary fires due to electrical leakage caused by water discharge.

〔Effect of the invention〕

As explained above, according to the present invention, the fire detector 7 detects not only the temperature but also the concentration of smoke, and the smoke is forcibly taken in by the intake fan 13. The occurrence of this can be detected at an extremely early stage.

Furthermore, the water spraying portion 1c of the water sprayer 1 is spherical and can spray water into the attic and indoors at the same time, making it possible to carry out fire extinguishing activities extremely effectively.

Furthermore, an automatic fire protection device is provided that can automatically extinguish an initial fire without requiring human intervention, and can minimize damage without endangering human life.

[Brief explanation of the drawing]

Figure 1 is a front view showing a water cannon applied to this invention installed on a ceiling partition, Figure 2 is a plan view of the water cannon, Figure 3 is an exploded perspective view of the water cannon, and Figure 4 5 is a sectional view of the fire detector, FIG. 5 is a plan view of the fire detector, and FIG. 6 is an explanatory diagram for explaining the operation of the automatic fire prevention device of the present invention. In the figure, 1 is a water cannon, 1a and 1b are hemispheres, and 1c
is a water discharge part, 2 is a water discharge hole, 3 is a mounting flange, 4 is a ceiling bulkhead, 5 is a connecting pipe, 6 is a solenoid valve, 7 is a fire detector, 8 is an intake window, 9 is an exhaust window, 10 is a casing cap, 11 is a smoke density sensor, 12 is a temperature sensor, 13 is an intake fan, and M is a motor.

Claims (1)

[Scope of Claims] 1. A smoke concentration sensor capable of distinguishing between two types of smoke concentration, light and dark, a temperature sensor that detects a constant air temperature, and an initial fire detector equipped with an intake fan that forcibly takes in air. , It is installed in a spherical hollow water discharge part that is attached to the ceiling bulkhead and has a large number of water discharge holes that can discharge water both into the attic and into the room, and a pipe that connects the water discharge part and the water supply part, and the above-mentioned It has a solenoid valve that is activated by a signal from a fire detector, and a multi-angle water cannon for fire extinguishing that can simultaneously spray water indoors and above the ceiling when activated by the solenoid valve, as well as an alarm system in the control room and inside the building, and alarms to detect the cause of a fire. It is equipped with a central management control panel that controls a location display means, an air conditioner in the building, and a power supply in the building, and when the fire detector detects smoke at a relatively low concentration at the initial stage of a fire, it sounds an alarm in the control room. At the same time, the above-mentioned fire cause location display means is displayed blinking, and subsequently the above-mentioned fire detector detects smoke with a higher concentration than the smoke at the initial stage of the fire, and the above-mentioned temperature sensor detects a certain air temperature. If this is detected, the alarm in the building will be activated, the air conditioner in the building will be stopped, the power in the building will be cut off, the solenoid valve will be opened, and the multi-angle water cannon will be sprayed from the multi-angle water cannon at the location where the cause of the fire occurred. An automatic fire protection device that extinguishes fires by spraying water inside the attic and indoors.