JPS5840475Y2 - fire detector - Google Patents

Description

[Detailed explanation of the idea] This invention relates to improvements in fire detectors.

In order to eliminate false alarms and increase the reliability of detection, conventional fire detection methods include installing heat detectors and smoke detectors, and determining whether or not there is a fire based on the output signals of both. It is being

However, these methods all perform spot detection, and in order to cover a wide area, it is necessary to install many detectors, resulting in extremely high costs.

Also, both smoke detectors and heat detectors are too sensitive.
There are many problems, such as a lot of false alarms and being useless in real life.

Fusible insulator type fire detectors are available as devices that can cover a wide range of areas, but they have problems such as being limited in where they can be used due to water resistance, etc., and malfunctions due to mechanical damage.

There is also a fire detection system that applies internal pressure to a thermoplastic pipe using gas, and detects when the pipe ruptures due to heat and the internal pressure decreases, thereby detecting a fire.

This has the advantage of being low in cost, non-electrical detection, so can be used in explosion-proof areas, and can be used in combination with a method for detecting abnormal positions, but it is also possible that the pipe may be destroyed due to heat during a fire, dz trauma, etc. It was not possible to distinguish whether the malfunction was due to mechanical damage, and there was no way to check for malfunctions.

The purpose of this invention is to eliminate the malfunction of the above-mentioned fire detector using thermoplastic pipes and provide a highly reliable fire detector, which can reduce the temperature and smoke in the event of a fire. It has a remarkable feature that it can be detected by one device.

This idea can be summarized as follows.

This idea involves pre-pressurizing thermoplastic pipes,
Alternatively, reduce the pressure, detect the temperature around the area when the pipe ruptures due to heat in the event of a fire, and then inhale outside air from the ruptured part of the pipe to determine whether there is smoke in the intake gas. This is a device that has a series of functions such as activating a fire alarm and issuing a fire signal.

Examples of this invention will be described below based on the drawings.

FIG. 1 shows this embodiment. As the sensor pipe 1, a thermoplastic plastic pipe such as PE or PVC, or a thermoplastic plastic knob made of metal, plastic, etc. with an opening is used.

The pipe 1 is filled with air, nitrogen gas, carbon dioxide gas, etc. by a gas supply device 8 via a pressure detection device 6 and a branch joint of the pipe, and an internal pressure of about 2 atmospheres is constantly applied thereto.

When the sensor pipe 1 ruptures due to the heat of the fire, the pressure detection device 6 detecting the internal pressure of the pipe 1 detects the pressure change and issues a signal.

For pressure detection, pressure switches, differential pressure relays, etc. are used.

This signal causes the electromagnetic valve 3 connected to the other end of the branch joint 2 of the pipe to open, and at the same time activates the intake device 4 connected to the valve, which detects smoke. The outside gas near the rupture part of the pipe 1 is introduced to the smoke detection device 5 which performs the following.

If this gas contains smoke, the smoke detection device 5
activates and issues a fire signal.

The smoke detection device 5 may be of an ionization type or a photoelectric type, which is the same type as a spot type smoke detector.

The reservoir 7 connected to the pressure detection device 6 is designed to compensate for even if a very small amount of gas sealed in the sensor pipe 1 leaks from the branch joint 2 of the pipe under normal conditions. be.

In the above embodiment, gas is sealed in the pipe 1. However, it may be a pressure reducing type in which the pressure inside the pipe 1 is constantly reduced. In order to prevent malfunctions due to internal pressure reaching atmospheric pressure, it is desirable to constantly exhaust the gas in the pipes with a pump.

As described above, whereas conventionally heat and smoke during a fire were detected using separate detectors, this invention makes it possible to detect both using only the sensor pipe. Since it is possible to isolate malfunctions caused by mechanical damage such as external trauma, the reliability of the fire detector is significantly improved.

The features of this detector are as follows.

(1) Since it can be made long, it is possible to detect fires in a wide range rather than in spots.

(2) Since it is not electrically detected, it can also be used in explosion-proof areas.

(3) Since the pressure drop inside the pipe is detected, a position detection device can be easily installed.

(4) A thermoplastic pipe is used as the sensor pipe, and only one temperature and smoke detection device is required, so the cost is low.

(5) Equipment maintenance is easy. (6) Ruptures caused by mechanical damage to pipes and thermal ruptures caused by fire can be separated by smoke detection, making the device highly reliable as a fire detector.

Currently, the frequent malfunctions of fire detectors are a problem in terms of disaster prevention measures.According to this invention, this problem can be fully resolved, and its practical effects are extremely large.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of this invention. 1...Sensor pipe, 2...Pipe branch joint, 3...Solenoid valve, 4...
・Intake device, 5...Smoke detection device, 6...
・Pressure detection device, 7... Reservoir 8...
...Gas supply device.

Claims (1)

[Scope of utility model registration request] A fire detector that detects temperature by detecting a change in pressure due to local thermal rupture of a thermoplastic sensor pipe that is pressurized or depressurized, the fire detector detecting temperature by detecting a change in pressure due to local thermal rupture of a thermoplastic sensor pipe that is pressurized or depressurized. A fire detection device comprising a smoke detection device that connects an intake device that takes in air to the sensor probe, detects smoke in the gas taken in by the intake device through a burst hole, and issues a fire signal. vessel.