JP2002074534A - Fire detector for house - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly reliable fire detector for house whose sensitivity can be easily changed in accordance with its installation environment and non- fire alarms can be reduced. SOLUTION: The fire detector is composed of a fire detecting means 1 consisting of a smoke detecting part 11 for detecting smoke emission level S, a fire discrimination means 2 for discriminating fire and a sensitivity switching means 3 which has three types of switching levels 'LV1', 'LV2' and 'LV3' and can switch fire criterion in the means 2 in accordance with an installation place. In this case, fire discrimination smoke densities LS1, LS2 and LS3 and fire discrimination storage periods LT1, LT2 and LT3 respectively corresponding to the three types of switching levels 'LV1', 'LV2' and 'LV3' owned by the means 3 are preliminary set.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire detector for a house, which detects a physical quantity associated with a fire phenomenon, judges a fire, and outputs a fire signal.

[0002]

2. Description of the Related Art FIG. 6 shows the structure of a residential smoke detector as a conventional residential fire detector. Conventional residential smoke detectors
It comprises a fire detection means 1 comprising a smoke detection unit 11 for detecting the smoke generation level S, and a fire judgment means 2 for making a fire judgment. The fire determining means 2 having received the smoke level S detected by the smoke detector 11 compares the smoke level S with a preset fire determination smoke density LS in an operation step 21 and determines that the smoke level S is a fire. If the smoke density LS is not exceeded, the smoke detection section 11 detects the smoke level S again. If the smoke level S exceeds the fire determination smoke density LS, in operation step 22, the duration T from when the smoke level S exceeds the fire determination smoke density LS is compared with a preset fire determination accumulation time LT. If the duration time T does not exceed the fire determination accumulation time LT, the smoke detector 11 detects the smoke level S again. If the duration time T exceeds the fire determination accumulation time LT, it is determined that a fire has occurred, and a fire signal 5 is output.

[0003]

As described above, the conventional residential fire detector has a constant sensitivity such as the fire determination smoke density LS and the fire determination accumulation time LT. There is a drawback that many reports are generated.

The present invention has been made in view of the above circumstances, and a purpose thereof is to allow a user to easily change the sensitivity in accordance with an installation environment and to reduce non-fire reports. An object of the present invention is to provide a high-reliability residential fire detector.

[0005]

According to a first aspect of the present invention, there is provided a fire detecting means for detecting a physical quantity associated with at least one or more fire phenomena, and a fire judgment is made based on the physical quantity detected by the fire detecting means. In a residential fire detector having a fire judging means, a sensitivity switching means capable of switching a fire judging criterion in the fire judging means according to an installation environment is provided. Sensitivity can be changed, non-fire reports can be reduced, and a fire can be detected early.

According to a second aspect of the present invention, in the first aspect of the invention, the sensitivity switching means has switching levels of "for bedroom", "for general living room", and "for kitchen" which are divided according to the installation location. In addition, the fire criterion for the bedroom is sensitive, the fire criterion for the general living room is switched to normal, and the fire criterion for the kitchen is switched to insensitive. It is possible to reduce non-fire reports and detect fires early.

According to a third aspect of the present invention, in the first or second aspect, the fire detecting means detects a physical quantity associated with at least two or more fire phenomena, and the two or more physical quantities detected by the fire detecting means. Function selection means for selecting one or more physical quantities among the above, wherein the fire determination means makes a fire determination based on the selected one or more physical quantities, and functions depending on the occurrence of a non-fire report. Can be selected, and non-fire reports can be reduced and a fire can be detected early.

According to a fourth aspect of the present invention, in the first aspect of the invention, the sensitivity switching means switches between “sensitive”, “normal”, and “insensitive” classified according to the sensitivity of the fire judgment criterion in the fire judgment means. Level, and the fire criteria when the environment is low in the occurrence of non-fire reports are sensitive. It is characterized by the insensitive switching of fire criteria when there are many environments, allowing users to easily change the sensitivity according to the installation environment, reducing non-fire reports and detecting fires early. it can.

According to a fifth aspect of the present invention, in the fourth aspect, the fire detecting means detects physical quantities associated with at least two or more fire phenomena, and among the two or more physical quantities detected by the fire detecting means. A function selecting means for selecting one or more physical quantities is added, and the fire determining means makes a fire determination based on the selected one or more physical quantities, and selects a function according to a non-fire report occurrence state. It is possible to reduce non-fire reports and detect fires early.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) As shown in FIG. 1, the circuit configuration of Embodiment 1 is a smoke detector 1 for detecting a smoke level S.
1, a fire determining means 2 for making a fire determination, and three types of switching levels "LV1" and "LV".
2 "," LV3 ", and a sensitivity switching means 3 which can switch the fire criterion in the fire deciding means 2 according to the installation environment. The sensitivity switching means 3 is installed in the fire detector main body and can be realized by, for example, switching with a switch.

The fire judgment standard is set by the fire judgment smoke density LS and the fire judgment accumulation time LT. The fire judgment smoke density LS is a smoke density range of 2.5% /
m to 22.5% / m, and the fire determination accumulation time LT is also set within an allowable range. Unlike the non-residential smoke detector, the residential smoke detector has a wide range of allowable smoke density without sensitivity type, so that the sensitivity setting can be largely changed. Sensitivity can be set to an appropriate value according to the environment, installation location, and application. In order to increase the sensitivity, the smoke determination smoke concentration LS is reduced and the fire determination accumulation time LT is shortened. Conversely, in order to make the sensitivity insensitive, the fire determination smoke density LS is increased and the fire determination accumulation time LT is lengthened.

In the first embodiment, three types of switching levels "LV1", "LV2", and "LV" of the sensitivity switching means 3 are provided.
Fire smoke concentration LS1, LS2, L corresponding to "3"
S3 and the fire determination accumulation times LT1, LT2, and LT3 are set in advance, and the switching level of the sensitivity switching unit 3 is set to "L".
When the fire determination criterion is switched to "V1", the fire determination criterion is sensitive, for example, the fire determination smoke density LS1 is set to 5% / m, the fire determination accumulation time LT1 is set to 10 seconds, and when the switching level is switched to "LV2", the fire determination criterion becomes Normal sensitivity, for example, fire determination smoke density LS2 is 10% / m, and fire determination accumulation time LT2
Is set to 20 seconds, and when the switching level is switched to “LV3”, the fire judgment standard is insensitive, for example, the fire judgment smoke density LS3 is 15% / m, and the fire judgment accumulation time LT3 is 30.
Set to seconds.

Next, the operation of the first embodiment will be described. In operation step 21, the fire determining means 2 having received the smoke level S detected by the smoke detector 11 inputs the smoke level S detected by the smoke detector 11 and the fire determination smoke concentrations LS1, LS2, LS3. The smoke determination unit 11 compares the smoke determination smoke density LS corresponding to one of the switching levels selected and switched by the sensitivity switching unit 3 with the smoke determination unit 11 if the smoke emission level S does not exceed the fire determination smoke density LS. The smoke level S is detected. If the smoke level S exceeds the fire determination smoke density LS, in operation step 22, the duration T after the smoke level S exceeds the fire determination smoke density LS.
And the fire judgment accumulation time LT corresponding to any one of the switching levels selected and selected by the sensitivity switching means 3 among the fire judgment accumulation times LT1, LT2, and LT3. If it does not exceed LT, the smoke detection section 11 detects the smoke emission level S again. If the duration time T exceeds the fire determination accumulation time LT, it is determined that a fire has occurred, and a fire signal 5 is output.

Since the fire detector main body is provided with the sensitivity switching means 3 as described above, the fire judgment standard can be easily switched according to the installation environment, thereby reducing non-fire reports and early detection of fire. be able to.

(Embodiment 2) As shown in FIG. 2, in the circuit configuration of Embodiment 2, the switching level of the sensitivity switching means 3 in FIG. 1 showing Embodiment 1 is set to "bedroom" and "general living room". ,
It is divided according to the installation location, such as "for kitchen", so that the sensitivity can be changed according to the installation location. The same elements as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. Omitted.

In the second embodiment, each fire judgment criterion is set in advance in accordance with each installation location of "for bedroom", "for general living room", and "for kitchen". The switching level of the switching means 3 is switched to "for the bedroom", and the fire judgment standard at that time is sensitive because, for example, it is necessary to detect a fire that occurred while sleeping at an early stage. m, the fire judgment accumulation time LT1 is set to 10 seconds. When installed in a general living room, the switching level of the sensitivity switching means 3 is switched to "for a general living room", and the fire judgment standard at that time is usually, for example, a two-sensitivity sensor installed in a general office. And the fire determination smoke density LS2 is set to 10% / m, and the fire determination accumulation time LT2 is set to 20 seconds. Sensitivity switching means 3 when installed in kitchen
Is switched to "for kitchen", and the fire determination standard at that time is considered insensitive because there may be many non-fire reports due to steam or smoke due to cooking. For example, the fire determination smoke density LS3 is set to 15% / m, the fire judgment accumulation time LT3 is set to 30 seconds.

The operation is the same as in the first embodiment, and a description thereof will be omitted.

As described above, since the fire judgment standard can be switched according to the installation location, non-fire reports can be reduced, and a fire that occurred in the bedroom at bedtime can be detected early.

(Embodiment 3) As shown in FIG. 3, the circuit configuration of Embodiment 3 is a smoke detector 1 for detecting a smoke level S.
1 and a heat detecting unit 12 for detecting a heat generation level N; fire determining means 2 for determining a fire;
Type switching level “LV1”, “LV2”, “LV3”
A sensitivity switching means 3 which can switch the fire judgment criteria in the fire judgment means 2 according to the installation environment; and a physical quantity detected by the fire detection means 1, that is, a physical quantity to be used among the smoke level S and the heat generation level N. And a function selecting means 4 for selecting Specifically, the function selection unit 4 determines whether the function of the fire detection unit 1 is “only the smoke detection unit 11”, “only the heat detection unit 12”, or “the smoke detection unit 11 and the heat detection unit 12 according to the physical quantity used”. Both "can be selected.

In the third embodiment, three types of switching levels "LV1", "LV2",
Fire determination smoke density LS1, LS corresponding to "LV3" respectively
2, LS3, fire judgment temperatures LN1, LN2, LN3, and fire judgment accumulation times LT1, LT2, LT3 are set in advance.
And the fire judgment temperature LN is lowered, and the fire judgment accumulation time LT
Shorten. Conversely, to make the sensitivity insensitive, the fire determination smoke density LS and the fire determination temperature LN are increased, and the fire determination accumulation time LT is lengthened.

Then, a fire judgment criterion is set by the sensitivity switching means 3 according to the function selected by the function selection means 4.
For example, when used in a kitchen, non-fire reports due to steam or smoke during cooking are considered to occur frequently.
Only "is selected, and the switching level of the sensitivity switching means 3 is switched and selected to make the fire determination standard insensitive, so that the occurrence of non-fire reports can be reduced.

Next, the operation of the third embodiment will be described. According to the function selected by the function selection means 4, the smoke emission level S detected by the smoke detection unit 11 and the heat detection unit 1
At least one of the heat generation levels N detected by the control unit 2 is compared and determined by the fire determination unit 2.

When "only the smoke detector 11" is selected by the function selector 4, the fire detector 2 determines in step 21 the smoke emission level S detected by the smoke detector 11 and the fire determination smoke. Among the densities LS1, LS2, and LS3, the sensitivity switching means 3 switches and selects one of the switching levels selected and compared with the fire determination smoke density LS, and the smoke emission level S must not exceed the fire determination smoke density LS. In this case, the smoke detection section 11 detects the smoke level S again. If the smoke level S exceeds the fire determination smoke density LS, in operation step 22, the duration T from when the smoke level S exceeds the fire determination smoke density LS, and the fire determination accumulation times LT1 and LT
2, the fire judgment accumulation time L corresponding to any one of the switching levels selected and switched by the sensitivity switching means 3 of LT3.
If the duration time T does not exceed the fire determination accumulation time LT, the smoke detection unit 11 detects the smoke level S again. If the duration time T exceeds the fire determination accumulation time LT, it is determined that a fire has occurred, and a fire signal 5 is output.

When "only the heat detecting section 12" is selected by the function selecting section 4, the fire determining section 2 determines in step 23 the heat generation level N detected by the heat detecting section 12 and the fire determining temperature. Of the LN1, LN2, and LN3, the sensitivity is switched by the sensitivity switching means 3 and compared with the fire determination temperature LN corresponding to any one of the switching levels. If the heat generation level N does not exceed the fire determination temperature LN, heat detection Part 1
2, the heat generation level N is detected again. Heat generation level N
If the temperature exceeds the fire determination temperature LN, in operation step 22, the duration T from when the heat generation level N exceeds the fire determination temperature LN, and the fire determination accumulation times LT1, LT2, and LT3
And the fire detection accumulation time LT corresponding to any one of the switching levels selected and switched by the sensitivity switching means 3, and if the duration time T does not exceed the fire judgment accumulation time LT, the heat detection unit 11 The heat generation level N is detected again. If the duration time T exceeds the fire determination accumulation time LT, it is determined that a fire has occurred, and a fire signal 5 is output.

When "both smoke detector 11 and heat detector 12" are selected by the function selector 4, the above-mentioned operation when "only smoke detector 11" is selected and the "heat detector 1"
The above operation when "only 2" is selected is performed independently. At this time, in the third embodiment, the smoke level S
And the heat generation level N, the fire is determined based on the fire determination smoke density LS and the fire determination temperature LN, which are the fire determination standards for each unit, but the fire is determined by combining the smoke generation level S and the heat generation level N. The fire may be determined based on the criterion.

As described above, the function can be selected by the function selecting means 4 according to the state of occurrence of the non-fire report, and the non-fire report can be reduced and the fire can be detected early.

(Embodiment 4) As shown in FIG. 4, the circuit configuration of the embodiment 4 is such that the switching level of the sensitivity switching means 3 shown in FIG. , "Normal", and "insensitive", and the sensitivity can be changed according to the installation environment. The same elements as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. . When installed in an environment where the occurrence of non-fire reports is considered to be extremely small, for example, in a warehouse or closet, the switching level of the sensitivity switching means 3 is switched to "sensitive" to make the fire judgment criteria more sensitive, and Make settings so that they can be found early. Conversely, if installed in an environment where a lot of non-fire reports are generated, for example, in a dressing room next to a kitchen or bathroom, there will be many non-fire reports due to steam or smoke from cooking or steam from the bathroom. Then, the switching level of the sensitivity switching means 3 is switched to "insensitive" to make the fire judgment criterion insensitive, and set so as to reduce non-fire reports. The operation is the same as that of the first embodiment, and the description is omitted.

As described above, since the fire judgment criteria can be switched according to the installation environment, non-fire reports can be reduced, and a fire can be found early.

(Embodiment 5) As shown in FIG. 5, the circuit configuration of the fifth embodiment is such that the switching level of the sensitivity switching means 3 of FIG. , "Normal", and "insensitive", and the sensitivity can be changed according to the installation environment. The same elements as those in the third embodiment are denoted by the same reference numerals, and description thereof is omitted. . As in the third embodiment, the function used by the fire detecting means 1 is set to “only the smoke detecting unit 11”, “only the heat detecting unit 12”, and “both the smoke detecting unit 11 and the heat detecting unit 12” by the function selecting unit 4. You can choose one of them. Then, in accordance with the function selected by the function selection unit 4, the fire determination criterion is set by the sensitivity switching unit 3. For example, when non-fire reports frequently occur due to the rise in temperature due to a heating device in winter, the function selection unit 4 selects “only the smoke detection unit 11” as the function of the fire detection unit 1,
In addition, the switching level of the sensitivity switching means 3 is switched to "insensitive" to make the fire determination standard insensitive, so that the occurrence of non-fire reports can be reduced. When non-fire reports due to steam from the bathroom frequently occur at a dressing room next to the bathroom, the function selecting means 4 selects "only the heat detecting section 12" as the function of the fire detecting means 1, and By switching the switching level of the sensitivity switching means 3 to "insensitive" and making the fire determination standard insensitive, it is possible to reduce the occurrence of non-fire reports. The operation is the same as that of the third embodiment, and the description is omitted.

In the fifth embodiment, the function used by the fire detecting means 1 by the function selecting means 4 is "Smoke detecting section 1".
When both “1 and the heat detection unit 12” are selected, the fire is determined based on the fire determination smoke concentration LS and the fire determination temperature LN, which are the fire determination standards for the smoke generation level S and the heat generation level N, respectively. Alternatively, a fire may be determined based on a fire determination criterion for determining a fire by combining the smoke level S and the heat generation level N.

As described above, the function can be selected by the function selecting means 4 in accordance with the occurrence situation of the non-fire report, and the non-fire report can be reduced and the fire can be detected early.

[0033]

According to the first aspect of the present invention, there is provided a fire detecting means for detecting a physical quantity associated with at least one or more fire phenomena, and a fire determining means for making a fire determination based on the physical quantity detected by the fire detecting means. In a residential fire detector having a, the sensitivity determination means for switching the fire determination criteria in the fire determination means according to the installation environment is provided, so that the user can easily change the sensitivity according to the installation environment. In addition, there is an effect that a non-fire report can be reduced and a fire can be detected early.

According to a second aspect of the present invention, in the first aspect of the present invention, the sensitivity switching means has switching levels of “for bedroom”, “for general living room”, and “for kitchen” which are divided according to the installation location. However, the fire criterion for the bedroom is sensitive, the fire criterion for the general room is switched to normal, and the fire criterion for the kitchen is switched to insensitive, so that the user can easily change the sensitivity according to the installation location. This has the effect of reducing non-fire reports and early detection of fire.

According to a third aspect of the present invention, in the first or second aspect, the fire detecting means detects at least two physical quantities associated with a fire phenomenon, and the two or more physical quantities detected by the fire detecting means are detected. Function selection means for selecting one or more physical quantities among them, and the fire determination means makes a fire determination based on the selected one or more physical quantities. Therefore, there is an effect that non-fire reports can be reduced and a fire can be detected early.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the sensitivity switching means switches between “sensitive”, “normal”, and “insensitive” classified according to the sensitivity of the fire judgment criterion in the fire judgment means. Level, and the fire criteria when the environment is low in the occurrence of non-fire reports are sensitive. The effect is that the user can easily change the sensitivity according to the installation environment because the fire judgment criteria are switched insensitively when there are many environments, reducing non-fire reports and early detection of fires. There is.

According to a fifth aspect of the present invention, in the invention of the fourth aspect, the fire detecting means detects a physical quantity associated with at least two or more fire phenomena, and among the two or more physical quantities detected by the fire detecting means. A function selecting means for selecting one or more physical quantities is added, and the fire determining means makes a fire determination based on the selected one or more physical quantities.
The function can be selected according to the status of non-fire reports,
This has the effect of reducing non-fire reports and early detection of fire.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a first embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a second embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a third embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a fourth embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a fifth embodiment of the present invention.

FIG. 6 is a diagram showing a configuration of a conventional example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fire detection means 11 Smoke detection part 2 Fire judgment means 3 Sensitivity switching means S Smoke emission level LV1-LV3 Switching level LS1-LS3 Fire judgment smoke density LT1-LT3 Fire judgment accumulation time

Claims (5)

[Claims] 1. A residential fire detector comprising: a fire detecting means for detecting a physical quantity associated with at least one or more fire phenomena; and a fire determining means for making a fire determination based on the physical quantity detected by the fire detecting means. 2. The fire detector for a house according to claim 1, further comprising sensitivity switching means for switching a fire judgment criterion in said fire judgment means according to an installation environment. The sensitivity switching means has switching levels of "for bedroom", "for general living room", and "for kitchen", which are divided according to the installation location, and sensitively determines a fire criterion for bedroom. 2. The fire detector according to claim 1, wherein the fire criterion for the general living room is switched to the normal fire criterion and the fire criterion for the kitchen is switched insensitively. 3. A fire detecting means for detecting a physical quantity associated with at least two or more fire phenomena, and a function selecting means for selecting one or more physical quantities among the two or more physical quantities detected by the fire detecting means. 3. The fire detector according to claim 1, wherein the fire determining means performs a fire determination based on the selected one or more physical quantities. 4. The sensitivity switching means has switching levels of "sensitive", "normal", and "insensitive" classified according to the sensitivity of the fire judgment criterion in the fire judgment means, and the occurrence of non-fire reports is small. Sensitive fire criteria when there is an environment, normal fire criteria when non-fire reports occur in an ordinary environment, and insensitive fire criteria when there are many non-fire reports. The fire detector according to claim 1, wherein the fire detector is switched. 5. A fire detecting means for detecting a physical quantity associated with at least two or more fire phenomena, and a function selecting means for selecting one or more physical quantities from the two or more physical quantities detected by the fire detecting means. 5. The fire detector according to claim 4, wherein the fire determining means makes a fire determination based on the selected one or more physical quantities.