JPS5922633Y2 - monitoring device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a monitoring device for detecting the occurrence of a situation such as a fire.

A typical prior art is the air tube type differential distribution type sensor specified by the Fire Service Act.

This sensor consists of a steel pipe with a diameter of 1 to 2 mm installed in a fire monitoring area, with a small diameter through hole bored at one end and connected to a pressure switch at the other end.

Under normal conditions, the pressure inside the copper pipe is equal to atmospheric pressure.

When a fire occurs, the steel pipes are heated and the air inside the copper pipes expands.

This amount of expansion is greater than the amount of leakage from the through hole, so the pressure inside the copper tube increases and the pressure switch is activated.
A fire is reported.

In this method, a fire is falsely detected whenever a sudden temperature change occurs even if no fire has occurred.

Sudden temperature changes often occur, for example, in factories and steel mills where heating furnaces are installed.

The present invention was devised in view of these problems, and its main purpose is to provide a monitoring device that can reliably detect the occurrence of a fire or the like without error.

Generally speaking, in the monitoring device according to the present invention, fluid is fed under pressure from a fluid pressurization source to a fluid pipe line arranged in a monitoring area via a constant secondary pressure type pressure reducing valve and a flow rate regulating valve. The present invention is characterized in that by detecting the fluid pressure at the end of the pipeline, it is possible to detect the occurrence of an emergency situation such as a breakdown of the pipeline, ie, a fire.

The drawing is a system diagram of an embodiment of the present invention.

This monitoring device is used for fire alarm.

In the monitoring area 1, a pneumatic pipeline 2 is installed on the ground and/or in space.

Compressed air is supplied to one end 2a of the conduit 2 from an air pressure source 3 via a pressure reducing valve 4 and a flow control valve 5.

The pressure reducing valve 4 is a so-called constant secondary pressure type that functions to maintain the secondary pressure, that is, the pressure on the pipe line 2 side, at a set value.

Therefore, the air pressure in the conduit 2 remains at a stable value even when there are fluctuations in the air pressure from the air pressure source 3, undesired leakage of a small amount of air from the conduit 2, and changes in the temperature around the conduit 2. is maintained.

The flow control valve 5 prevents an excessive flow rate of compressed air from being released into the atmosphere even if the pipe line 2 is destroyed in the event of a fire, as will be described later.

This prevents a decrease in air pressure from having an adverse effect on other pneumatic equipment commonly connected to the air pressure source 3 in a factory or the like.

The other end 2b of the conduit 2 is connected to a pressure switch 6.

The output from this pressure switch 6 is given to an alarm 7.

The alarm device 7 includes a lamp, a buzzer, etc., and includes a pressure switch 6.
A fire indication is performed in response to a change in the switching mode of the fire alarm.

The pipe line 2 must be made of thermofusible material, which will melt and be destroyed under high temperature conditions during a fire.

Suitable examples of such materials include inexpensive synthetic resins such as vinyl chloride and nylon.

According to the inventor's experiments, for example, an air pressure of 1.4 k
g/crn'', the cylindrical conduit cut out from the synthetic resin material had an inner diameter of 4 mm and a wall thickness of about 2 mm, and could be put to practical use.

The pressure switch 6 changes its switching mode as described above due to a decrease in the detected pressure due to the destruction of the pipe line 2, thereby providing a fire indication.

As another embodiment of the present invention, in order to detect leakage of high-temperature fluid from pipes, towers, tanks, etc., a pipe line 2 made of material that is melted and destroyed by such high-temperature fluid is installed in the detection area. You may.

In yet another embodiment of the invention, the conduit 2 is made of a material exhibiting low-temperature brittleness, thereby making it possible to
Leakage from towers, tanks, etc. may be detected.

Examples of materials that cause such low-temperature brittle fracture include synthetic resins such as vinyl chloride and rubber.

The area in which the conduit 2 is arranged is linearly detected, but by bending and encircling the conduit 2 at appropriate intervals, substantially planar detection becomes possible, and a wide area can be detected. Monitoring can be performed more reliably.

The pressure fluid in the pipe line 2 may be air as described above, but may also be other gases or liquids such as water.

As described above, according to the present invention, since the fluid pressure in the pipeline installed in the monitoring area is kept constant by the pressure reducing valve,
There is no risk of malfunction even due to sudden changes in ambient temperature.

Since a fire or the like is detected only after the pipe is destroyed, the detection is reliable.

Moreover, the fluid conduit is capable of linear detection over a long distance, and can also perform substantially planar detection over a wide area, making it possible to perform wide-range monitoring.

In addition, even if the fluid pipe line breaks in the event of an abnormality, the flow control valve prevents excessive flow of fluid from being released into the atmosphere. Therefore, even if other fluid pressure equipment is commonly connected to the fluid pressure source, This prevents the fluid pressure equipment from being adversely affected by a drop in fluid pressure.

Furthermore, by selecting the material of the fluid conduit in accordance with the abnormal temperature to be detected, it is possible to accurately detect and notify the set abnormal temperature.

Furthermore, the present device can be realized at low cost.

[Brief explanation of the drawing]

The drawing is a system diagram of an embodiment of the present invention. 1...Monitoring area, 2...Pipeline, 3...Pneumatic pressure source,
4...Secondary pressure constant type pressure reducing valve, 5...Flow rate control valve,
6...Pressure switch, 7...Alarm.

Claims (1)

[Scope of utility model registration request] A fluid pipeline 2 that is protected from materials that break down at abnormally high or abnormally low temperatures is installed in the monitoring area 1, and one end 2a of the fluid pipeline 2 is connected to a flow control valve 5 and a constant secondary pressure reducing pressure. A pressure switch 6 is connected to the fluid pressurization source 3 via a valve 4, and the other end 2b of the fluid pipeline 2 is connected to a pressure switch 6 whose switching mode changes according to the pressure drop in the fluid pipeline 2. A monitoring device characterized by being provided with an alarm device 7 that issues an alarm in response to a change in the switching mode of the pressure switch 6.