JP3316481B2 - Heat generation monitoring method by temperature measurement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation system for maintaining clean and sanitary environmental conditions such as a machine factory, an electric room, a warehouse, an oil cellar room, etc. The present invention relates to a method for monitoring heat generation by measuring the temperature at a plurality of points in an area where the temperature is maintained and monitoring (detecting) the presence or absence of heat generation for the purpose of detecting a fire in the area.

[0002]

2. Description of the Related Art As a method of monitoring heat generation of this type, a conventional method is disclosed in, for example, JP-A-7-198495 and JP-A-8-249.
A method using an optical fiber for temperature measurement disclosed in, for example, Japanese Patent No. 563 is known. In this method, a light pulse is made incident on an input end of an optical fiber laid around a ceiling in a monitoring area, thereby averaging a reflected light intensity of backscattered light generated in the optical fiber. By measuring the temperature at multiple points in the area and calculating the difference between the incident time of the light pulse and the time for the reflected light to reach the thermometer, the distance to the measurement point, that is, the measurement position, is known, and the heat generation point Is specified.

As a method for monitoring heat generation without using the above-mentioned optical fiber for temperature measurement, heat sensors are scatteredly installed at a plurality of locations on a ceiling in a monitoring area, and the presence or absence of a sensing operation of the plurality of heat sensors is determined. A method of determining a heat generation point by making a determination is also known.

[0004]

The above-mentioned conventional heat generation monitoring methods based on temperature measurement are based on the premise that there is no wind in the monitoring area, and generate heat somewhere in the monitoring area. When heat is generated, the heat from the heat source rises almost directly above, so the optical fiber portion corresponding to the position directly above the heat source or a position near the heat source senses the temperature rise, or the position just above the heat source or A heat sensor installed in a nearby position performs a sensing operation, thereby making it possible to specify a heat generation point in the monitoring area.

[0005] However, when an area to be constantly ventilated is to be monitored so as to maintain favorable environmental conditions, the heat from the heat source does not rise almost directly, but rises over a wide area. , And the dispersion dilutes the heat to reduce the temperature rise. Therefore, despite the heat generation, the measured temperature is lower than the set value, so that the predetermined heat generation monitoring function cannot be performed,
Even if the measured temperature is equal to or higher than the set value, it is difficult to specify the heat generation point because the temperature rise region of the optical fiber is too wide or a plurality of heat sensors perform sensing operations at the same time.

Further, even if the heat rises to a specific point without dispersing the heat over a wide area and the temperature rise accompanying the heat is detected by a specific portion of the optical fiber, or even when a heat detector at a specific point performs a sensing operation, the temperature rise is detected. Since the position is shifted from the actual heat source position, the heat generation point cannot be specified accurately. As a result, there is a problem that the initial fire extinguishing due to the detection of heat generation is likely to be delayed, and that effective fire extinguishing due to local release of the extinguishing agent cannot be performed.

[0007] The present invention has been made in view of the above-described circumstances, and even if heat is generated in any part of an area where ventilation is constantly maintained, the heat generation point can be quickly and accurately specified. It is an object of the present invention to provide a method for monitoring heat generation by measuring the temperature.

[0008]

In order to achieve the above object, according to the present invention, a method for monitoring heat generation by temperature measurement according to the first aspect of the present invention is a method of monitoring heat generation by a ceiling in a monitoring area which is always kept in a ventilation state. A heat generation monitoring method for measuring the temperature at a plurality of points in the area to monitor the presence or absence of heat generation, wherein a total of measured temperatures at the plurality of points in the monitored area has reached a set amount or more. If it is determined that the total has reached the set amount or more, the ventilation is stopped and switched to monitoring in a windless state.When monitoring in a windless state, any of the measured temperatures at multiple points is set. While detecting whether the temperature has risen above the specified value, the heat-generating point is specified. To return to the original ventilation The one in which the features.

According to a second aspect of the present invention, there is provided a method for monitoring heat generation by temperature measurement according to the second aspect of the present invention, comprising measuring a temperature at a plurality of points in a monitoring area which is always kept in a ventilation state. A method of monitoring heat generation by monitoring the presence or absence of heat generation, wherein the method determines whether the measured temperature at a certain point among the plurality of points in the monitoring area has risen above a set value, and determines whether the temperature has risen above a predetermined value. When the measured temperature rises above the set value, it stops ventilation and switches to monitoring in a no-wind state, and detects which of the measured temperatures at multiple points has risen above the set value when monitoring in this no-wind state While the heat generation point is specified by this, if none of the measured temperatures at the plurality of points rises above the set value even if the monitoring in the no-wind state has elapsed for the set time or more, the inside of the monitored area is returned to the original ventilation state. Is characterized by

According to the first and second aspects of the present invention, it is determined whether or not the sum of the measured temperatures at a plurality of points in the monitoring area has exceeded the set amount. When it is determined that the temperature has reached, or as a result of determining whether or not the measured temperature at a certain point among the plurality of points has risen above a set value, it is determined that the measured temperature at a certain point has risen above the set value. In such a case, although it is not possible to specify the heat generation point, it can be assumed that heat generation has occurred at some point in the area. Based on such assumptions, by stopping the normal ventilation state and switching to monitoring in the no-air state, the temperature at the point where the temperature rises rapidly due to the heat rising almost directly above the heat generation point is measured And
By detecting that the measured temperature has risen above the set value, it is possible to accurately specify the heat generation point earlier than the heat generation time.

If the measured temperature at a plurality of points does not rise above the set value even after the set time has passed in monitoring in a windless state, the cause of the temperature rise in the area is a factor other than heat generation, such as a rise in outside air temperature. In this case, it is necessary to return the monitored area to the original ventilation state by, for example, activation of a ventilation fan or the like, so that the monitored area is restored to a clean and sanitary environmental condition by ventilation. Is possible.

[0012] In the first or second aspect of the present invention, as the temperature measuring means at a plurality of points in the monitoring area, means for scatteredly installing heat sensors at a plurality of points on a ceiling in the area is adopted. Is also good. However, in this case, when dividing the monitoring area into small unit areas to enable effective fire extinguishing by local release of the fire extinguishing agent when heat generation is detected, a large number of heat sensors must be installed on the ceiling surface. It is necessary to install them densely, which leads to high construction costs and enormous maintenance.

[0013] Therefore, as described in claim 3, by using an optical fiber laid around the ceiling in the monitored area as a means for measuring the temperature at a plurality of points in the monitored area, a single or extreme temperature can be obtained. Only a few optical fibers need to be laid on the ceiling to simplify the construction,
While it is possible to reduce construction costs, even if heat is generated at any point in the monitoring area, it will be possible to detect the heat generation point with high accuracy, and it will be possible to significantly reduce maintenance work. Become.

[0014] In the invention of each of the above-mentioned claims, the means for stopping the ventilation is as described in claim 4.
It is conceivable to use a means for stopping a fan for ventilating the monitoring area and / or a means for closing a door provided at an opening connecting the inside and outside of the monitoring area. It is preferable to stop the fan and close the door in combination.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a structure to which a method for monitoring heat generation by temperature measurement according to the present invention is applied. This structure 1 is a two-story fire-resistant structure, and the first floor (1F) is, for example, A monitoring area A such as an electric room or an oil cellar room, and a second floor (2F) are formed in a storage area B such as a warehouse, and a fire door 2 that can be opened and closed is provided at an entrance of the monitoring area A on the first floor. With storage area B on the second floor
A ventilation fan 3 for forcibly ventilating both areas B and A is attached to the ceiling of the vehicle, and an exhaust pipe 4 extending from the monitoring area A to the outside stands on the side wall of the first floor.

On the ceiling in the monitoring area A on the first floor, a large number of optical fibers 5 are used as temperature measuring means for measuring the ambient temperature in the monitoring area A, especially the temperature near the ceiling. (Not shown) and laid all over the ceiling surface. As described above, the optical fiber 5 averages the reflected light intensity of the backscattered light generated in the optical fiber 5 by irradiating an optical pulse to the input end of the optical fiber 5 so that the optical fiber 5 in the monitoring area A can be obtained. By measuring the temperature at a plurality of points and calculating the difference between the incident time of the light pulse and the time at which the reflected light arrives at the temperature measuring unit 6 (see FIG. 2), the distance to the measuring point, that is, the measuring position, is calculated. You know.

FIG. 2 is a block diagram of a monitoring system for realizing a method of monitoring heat generation by temperature measurement. The monitoring system receives data from the temperature measuring unit 6 using the optical fiber 5 and measures the measured temperatures at a plurality of points in the monitoring area A. A determination unit 7 for determining whether or not the total of the measured temperatures at a plurality of points has reached or exceeded the set amount, and when it is determined that the total of the measured temperatures at a plurality of points has reached or exceeded the set amount, Blower control for stopping the ventilation and stopping the blower 3A of the ventilation fan 3 and the door opening / closing actuator 8 for automatically closing the fire prevention door 2 by the output signal from the determination unit 7 so as to stop the ventilation and switch to the monitoring in the no-air state. The unit 9 detects which of the measured temperatures at a plurality of points by the optical fiber 5 has risen above a set value during monitoring in a windless state, and specifies a heat generating point. And a notification section 10 such as alarms and screen display is operated by receiving the abnormality signal output from the determination unit 7 at.

Further, even if the monitoring in the windless state has passed for a set time or more, if none of the temperatures measured at the plurality of points by the optical fiber 5 has risen to the set value or more, the judging section 7 sets the inside of the monitored area A So that it returns to the original ventilation state,
The door opening / closing actuator 8 and the blower controller 9 output a door automatic opening signal and a blower operation start signal.

Next, the heat generation monitoring operation by the monitoring system having the above configuration will be described with reference to the flowchart of FIG. Normally, the fire door 2 is opened and the ventilation fan 3 is operated, whereby the inside of the monitored area A is kept in a ventilation state as shown by an arrow in FIG. Heat generation monitoring is performed based on the temperature measurement (step S21).

In the monitoring of heat generation in the ventilation state, the judgment unit 7 receiving data from the temperature measuring unit 6 using the optical fiber 5 determines that the total Tt of the measured temperatures at a plurality of points in the monitoring area A has exceeded the set amount Tto. It is determined whether or not it is (step S22). When the result of the determination is Tt ≧ Tto, a signal is output to the door opening / closing actuator 8 and the blower control unit 9, the fire door 2 is automatically closed, and the ventilation fan is closed. The operation of the third blower 3A is stopped, and the ventilation in the monitoring area A is stopped (step S23), and the monitoring is switched to the monitoring of heat generation in a windless state (step S24).

During the monitoring of heat generation in the windless state, since the heat from the heat source rises almost directly above, the temperature of the optical fiber 5 located immediately above the heat source or in the vicinity thereof rises rapidly. It is detected that the measured temperature Gt of the optical fiber 5 whose temperature has risen has risen above the set value St, that is, Gt ≧ St (step S2).
5) By doing so, the heat generation point in the monitoring area A is specified (step S26), and the judgment unit 7 notifies the notification unit 10
(Step S27) to notify the presence or absence of heat generation and the heat generation point in the monitoring area A by activating an alarm or displaying it on a screen.

If the measured temperature of each part by the optical fiber 5 does not rise to a set value or more even when a preset time t elapses during the monitoring of heat generation in a no-wind state as described above, the judgment unit 7 A signal is output to the door opening / closing actuator 8 and the blower control unit 9 to automatically open the fire door 2, and the blower 3A of the ventilation fan 3 is started to operate, and the inside of the monitoring area A is returned to the original ventilation state, and monitoring is performed. Zone A
The interior is restored to clean and sanitary environmental conditions (steps S28 and S29).

In the above-described embodiment, whether or not the total Tt of the measured temperatures at a plurality of points in the monitoring area A has reached the set amount Tto or more is a factor for judging the stoppage of ventilation when monitoring heat generation in the ventilation state. However, instead of this, the monitoring area A
It may be determined whether or not the measured temperature at a certain point among a plurality of points in the inside has risen above a set value, and the monitoring may be switched to the monitoring in a windless state based on the determination result that the temperature has risen. Also, instead of the total of the measured temperatures at a plurality of points, the temperature rise rate per unit time at each point may be used as a determination element for stopping the ventilation.

As in the above embodiment, it is most preferable to use an optical fiber 5 laid on the ceiling as a temperature measuring means at a plurality of points in the monitoring area A from the viewpoint of construction and cost. The heat generation monitoring similar to the embodiment may be performed by arranging a plurality of heat sensors on the ceiling surface.

[0025]

As described above, according to the first and second aspects of the present invention, the monitoring that is always kept in a ventilation state in order to maintain a clean and sanitary environmental condition by operating a ventilation fan or the like. If heat is generated in the area, pay attention to the fact that the temperature of the entire monitoring area or a temperature rise at a certain point deviating from the actual heat source is observed. By switching to state-based monitoring and measuring the temperature at points where the temperature rises rapidly under the influence of heat that rises almost directly above the point of heat generation due to the absence of wind, heat is generated anywhere in the monitored area. Even if the fever point is not earlier than the fever point,
In addition, there is an effect that the identification can be performed accurately. As a result, effective fire extinguishing by initial fire extinguishing due to heat generation detection and local release of fire extinguishing agent can be performed.

In particular, by using an optical fiber laid around the ceiling in the monitored area as a means for measuring the temperature at a plurality of points in the monitored area, it is possible to reduce the cost in terms of easy installation and facility construction. Regardless of the heat generation at any point in the monitoring area, the heat generation point can be detected with high accuracy, and the number of maintenance operations can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a structure to which a method for monitoring heat generation by temperature measurement according to the present invention is applied.

FIG. 2 is a block diagram of a monitoring system for realizing a method of monitoring heat generation by temperature measurement.

FIG. 3 is a flowchart illustrating a heat generation monitoring operation by the monitoring system.

[Explanation of symbols]

 2 Fire door 3 Ventilation fan 5 Optical fiber for temperature measurement 7 Judgment unit 8 Door opening / closing actuator 9 Fan blower control unit 10 Notification unit A Monitoring area

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akimitsu Yoshikawa 2-2-238 Mihara-cho, Mihara-cho, Minami-Kawachi-gun, Osaka Yamato Protec Co., Ltd. (72) Masaki Kobayashi, Mori 2-Mihara-cho, Minami-Kawachi-gun, Osaka No. 2-38 Yamato Protec Co., Ltd. (72) Inventor Yoshio Watanabe 2-2-238 Mitsudori, Mihara-cho, Minamikawachi-gun, Osaka Prefecture Yamato Protec Co., Ltd. (56) References JP-A-7-198495 ( JP, A) JP-A-8-249563 (JP, A) JP-A-5-266373 (JP, A) JP-A-9-273791 (JP, A) JP-A-7-275392 (JP, A) (58) ) Surveyed field (Int.Cl. ⁷ , DB name) G08B 17/00-31/00 G01J 5/10 G02B 6/00

Claims (4)

(57) [Claims] 1. A heat generation monitoring method for measuring a temperature at a plurality of points in a monitoring area, which is constantly maintained in a ventilation state, by monitoring temperatures at a plurality of points in the area, wherein the method includes the steps of: Judgment is made as to whether the sum of the measured temperatures at multiple points in the monitoring area has exceeded the set amount, and when it is determined that the total has exceeded the set amount, the ventilation is stopped and monitoring is performed in a windless state While monitoring in a calm state, the heat generation point is identified by detecting which of the measured temperatures at multiple points has risen above the set value. A method for monitoring heat generation by temperature measurement, wherein when none of the measured temperatures at a plurality of points rises above a set value, the inside of the monitored area is returned to the original ventilation state. 2. A heat generation monitoring method for measuring the temperature of a plurality of points in a monitoring area, which is constantly kept in a ventilation state, by monitoring the temperature at a plurality of points in the area to monitor the presence or absence of heat generation. Judgment is made as to whether the measured temperature at a certain point among the multiple points in the monitoring area has risen above the set value, and when the measured temperature at a certain point has risen above the set value, ventilation is stopped and no wind When monitoring in a windless state, the system detects the location of the heat generated by detecting which of the measured temperatures at multiple points has risen above the set value, while monitoring in the windless state has elapsed for a set time or more. Even if none of the measured temperatures at a plurality of points rises above a set value, the monitoring area is returned to the original ventilation state, and a method of monitoring heat generation by temperature measurement. 3. The temperature measuring device according to claim 1, wherein an optical fiber laid around a ceiling in the monitoring area is used as the temperature measuring means at a plurality of points in the monitoring area. Fever monitoring method. 4. A means for stopping the ventilation, wherein a means for stopping a fan for ventilating the monitored area and / or a means for closing a door provided at an opening connecting the inside and the outside of the monitored area are used. The method for monitoring heat generation by temperature measurement according to any one of claims 1 to 3.