JP3350601B2 - Multiple transmission type fire alarm system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a multiplex transmission type fire alarm system, and more particularly, to a fire alarm system in which a fire receiver only receives a fire signal without resetting a fire detector. The present invention relates to a multiplex transmission fire alarm system that outputs an alarm.

[0002]

2. Description of the Related Art Conventionally, in a multiplex transmission type fire alarm system, a fire detector detects smoke density and environmental temperature,
When those levels exceed a preset level, a fire signal is output to the fire receiver, and the fire receiver judges a fire. If this fire receiver is a non-storage type, it is judged as a fire when a fire signal is received and a fire alarm is output, but if it is a storage type, at the time the first fire signal is received The fire detector is restored once without determining that a fire has occurred, and when a second fire signal is received within a predetermined time set in advance, it is determined that a fire has occurred and a fire alarm is output.

[0003]

However, in the conventional multiplex transmission type fire alarm system described above, when the fire receiver is a storage type, the fire detector is restored by driving a fire relay and opening its contacts to drive. Since the power supply to the fire relay has been interrupted or a reset signal has been sent to the fire detector through multiple signal lines, it is possible to receive fire signals from other fire detectors during recovery. In some cases, the fire signal output from the fire detector became invalid.

The present invention has been made in view of the above circumstances, and a plurality of fires can be performed even if the fire receiver does not perform a reset operation for the fire detector by shutting off power or outputting a reset signal. It is an object of the present invention to provide a multiplex transmission fire alarm system that receives a fire signal output from a sensor without invalidating the fire signal and makes a fire judgment.

[0005]

The present invention proposed to achieve the above object has the following structural features. The multiplex transmission type fire alarm system according to any one of claims 1 to 3, wherein an address for multiplex transmission is set in each of the fire detectors, and a fire detector for detecting smoke density and environmental temperature; A comparison / determination unit that compares and determines the level of smoke density and temperature detected by the unit with a preset sensor level, and during normal monitoring, responds to a call from a fire receiver through multiple signal lines. A multiplex transmission control unit that periodically outputs a reply signal and interrupts and outputs a fire signal or the like in accordance with the result of the determination by the comparison / determination unit.The fire receiver receives a fire signal from the fire detector through a multiplex signal line. After receiving an interrupt signal or the like, a fire alarm or a fire forecast is output if the same fire detector does not receive a release signal for the signal being received from the same fire detector until a predetermined time elapses. , And has a configuration or to interlock control the Bohai smoke interlocking equipment.

[0006] In the first aspect of the present invention, the detector level serving as a criterion for the comparison and discrimination of the fire detector is a fire level and a fire release level, and the second level is a claim level, a forecast level, a forecast release level, and a claim level. In the item (3), the level of the item (2), the interlocking control level, and the interlocking control release level are set in advance, and a signal corresponding to each of them is output to the fire receiver.

According to a fourth aspect of the present invention, the fire level and the fire release level, the forecast level and the forecast release level, and the interlock control level and the interlock control release level, which are the criteria for the comparison and discrimination unit, have hysteresis. I have. According to a fifth aspect of the present invention, there is provided a fire detector for setting a fire level and a fire release level, a forecast level and a forecast release level, and an interlock control level and an interlock control release level, which are reference criteria of the comparison and discrimination unit. A device level setting unit is provided.

According to a sixth aspect of the present invention, by transmitting setting data from a fire receiver to a fire detector through a multiplex signal line, a fire level and a fire release level, which are criteria for a comparison and discrimination unit, and a forecast Level and forecast release level,
An interlocking control level and an interlocking control release level are set.

[0009]

According to the system of the present invention, the following basic operations are performed. In the multiplex transmission type fire alarm system according to claims 1 to 3, the fire receiver normally outputs a monitoring signal to the fire detector periodically through a multiplex signal line,
A reply signal output from the multiplex transmission control unit of the fire sensor is received, and a plurality of connected fire sensors are monitored. At the same time, the fire detector always detects the smoke density and the environmental temperature by the fire detector, and compares and determines the level of the detected smoke density and temperature with the preset detector level by the comparison / determination unit. The multiplex transmission control unit interrupts and outputs a fire signal or the like according to the determination result. On the other hand, after receiving a fire signal etc.
If a release signal for the received signal is not received from the same fire detector until a predetermined time elapses, a fire alarm or the like is output. In this case, the fire alarm can be determined by the fire receiver, the fire alarm and the fire forecast can be determined by the fire receiver, the fire alarm, the warning alarm, and the interlocking control of the smoke and smoke interlocking device can be determined by the fire receiver.

According to the present invention, the fire level and the fire release level, the forecast level and the forecast release level, and the interlocking control level and the interlocking control canceling level, which are criteria for the comparison and discrimination unit, have hysteresis. Therefore, in the fire detector, hunting occurs each time the level of the smoke density or the environmental temperature slightly changes near the fire level or the like, and a signal is not output to the fire receiver.

According to the fifth aspect of the present invention, the fire level and the fire release level, the forecast level and the forecast release level, and the interlocking control level, which are the criteria for the comparison and determination by the comparison and determination section, are set by the detector level setting section of the fire detector. An interlocking control release level can be set. According to the sixth aspect of the present invention, by transmitting the setting data from the fire receiver through the multiplex signal line, the fire level and the fire release level, the forecast level, and the forecast release, which are the determination criteria of the comparison and determination unit of the fire detector. A level, an interlock control level, and an interlock control release level can be set.

[0012]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an example of a configuration of a multiplex transmission type fire alarm system A according to the present invention.
The multiplex transmission type fire alarm system A includes a fire receiver 10
A plurality of fire detectors S are connected via a repeater 20 to a multiplexed signal line L derived from the above. In addition, an acoustic device B for outputting a fire alarm and a smoke prevention and smoke interlocking device 30 are connected to a relay. It is connected via the device 20.

An address for multiplex transmission is set in each of the fire detectors S, a fire detector 1 for detecting smoke density and environmental temperature, and a detector in which a fire level and a fire release level are set and stored in advance. Level storage unit 2, smoke density and temperature levels detected by the fire detection unit 1, and detector level storage unit 2
And a multiplex transmission control unit 4 for performing multiplex transmission with the fire receiver 10, and a fire level and a fire release level stored in the sensor level storage unit 2. Is provided with a sensor level setting unit 5 composed of a switch or the like for performing the setting. The detector level setting unit 5 may be constituted by a dip switch or a slide switch.

According to the present invention, the fire receiver 10 can judge a fire based on a signal output from the fire detector S with such a configuration. The operation will be described below. Normally, the fire receiver 10 periodically outputs a monitoring signal to each fire detector S through polling processing through the multiplex signal line L, and outputs a return signal output from the multiplex transmission control unit 4 of the fire detector S. It receives and monitors a plurality of connected fire detectors S.

At the same time, in the fire detector S, smoke density and environmental temperature are always detected by the fire detector 1, and the smoke density and temperature levels detected by the comparator 3 are stored in advance in the detector level storage 2. The fire level and the fire release level stored in the above are compared and determined. Here, when the level of the smoke density or the like detected by the fire detection unit 1 exceeds the fire level, the multiplex transmission control unit 4 interrupts and outputs a fire signal to the fire receiver 10. More specifically, when an interrupt signal is output from the fire detector S to the multiplex signal line L, the fire receiver 10
Inquires about the address of the fire detector S that has output the interrupt signal, and outputs the address and the fire signal from the fire detector S in response to the inquiry. When the level of smoke density or the like becomes lower than the fire release level, a fire release signal is similarly output as an interrupt.

On the other hand, the fire receiver 10 does not receive the fire release signal from the same fire sensor S until the predetermined time elapses after the fire signal is interrupted and received from the fire sensor S. If a fire is judged,
Outputs a fire alarm and indicates the indicator of the fire receiver 10 (not shown)
Is turned on, and the sound device B is sounded (claim 1). The predetermined time set here is a time for confirming that the received fire signal is not a sudden one. By not receiving the fire release signal within this time, it is not a malfunction but a true fire. Is determined to have occurred.

Next, an example of the above operation will be described with reference to FIG. In this figure, the smoke density V detected by the fire detector 1 of the fire detector S is shown by a curve corresponding to the time T,
The fire level and the fire release level stored in the sensor level storage unit 2 are stored at the same level. Fire receiver 10
Then, when a fire signal is received from the fire detector S, a timer (not shown) is started and a predetermined time Ta is counted. Then, if the fire release signal is not received within the predetermined time, it is determined that a fire has truly occurred.

Next, a multiplex transmission type fire alarm system A according to a second aspect will be described. The detector level storage unit 2 of the fire detector S stores a forecast level and a forecast release level in addition to the fire level and the fire release level, and the smoke density detected by the fire detector 1 by the comparison determination unit 3. A comparison is made with a level such as The fire detector S outputs a fire forecast signal and a fire forecast cancel signal in addition to the fire signal and the fire cancel signal according to the first embodiment. That is, when the level of the smoke density and the like detected by the fire detector 1 exceeds the forecast level, the multiplex transmission controller 4 interrupts and outputs a fire forecast signal to the fire receiver 10, and the level of the smoke density and the like is predicted. When it becomes lower than the release level, a fire forecast release signal is output as an interrupt.

On the other hand, in the fire receiver 10, in addition to the processing after receiving the fire signal according to the first aspect, similarly, after receiving the fire forecast signal from the fire detector S by interruption, the fire receiver 10 sets in advance. If the fire release signal is not received from the same fire detector S before the predetermined time elapses, a fire forecast is determined, a fire forecast is output, and the fire
Then, an indicator lamp (not shown) provided corresponding to each fire detector S is turned on.

Subsequently, in the multiplex transmission type fire alarm system A according to the third aspect, the detector level storage unit 2 of the fire detector S stores the fire level, the fire release level, the forecast level,
The interlocking control level and the interlocking control canceling level are stored in addition to the forecast canceling level. Then, in addition to the fire signal, the fire release signal, the fire forecast signal, and the fire forecast release signal, the fire detector S outputs an interlock control signal and an interlock control release signal in the same manner. That is, when the level of the smoke density and the like detected by the fire detector 1 exceeds the interlock control level, the multiplex transmission control unit 4 interrupts and outputs the interlock control signal to the fire receiver 10, and the level of the smoke density and the like is reduced. When the level falls below the interlock control release level, an interlock control release signal is output as an interrupt.

On the other hand, in the fire receiver 10, in addition to the processing after the reception of the fire signal and the reception of the fire forecast signal according to the second aspect, an interlocking control signal from the fire detector S is interrupted similarly to the above. After the reception, if the interlocking control release signal is not received from the same fire detector S until the preset predetermined time elapses, the interlocking control is determined, and the interlocking device 30 is interlocked and controlled. , Closing fire doors, etc.

The operation of the multiplex transmission type fire alarm system A according to claims 1 to 3 will be described with reference to FIG. 3. The fire level, the fire release level, and the forecast stored in the sensor level storage unit 2 will be described. The sensor levels of the level, the forecast release level, the interlock control level, and the interlock control release level generally have a relationship as shown in FIG.
After receiving the fire forecast signal, fire signal, and interlock control signal,
A predetermined time period Ta to Tc is counted, and when the respective release signals are not received within the predetermined time period, a fire forecast, a fire, and an interlock control are determined. Here, the predetermined time Ta to Tc for receiving each release signal can be arbitrarily set for each of the above determinations.

In the present invention, the fire level and the fire release level, the forecast level and the forecast release level, and the interlock control level and the interlock control release level stored in the sensor level storage unit 2 serving as the judgment reference of the comparison judgment unit 3 are determined. As shown in FIG. 3, a fire detector S having a configuration having a hysteresis h has been proposed. As a result, as shown by arrow A in FIG. 4, even if the level of the smoke density and the like detected by the fire detecting unit 1 slightly changes and frequently exceeds or falls below the fire level or the like, No signal is output to the fire receiver 10 each time.

Next, a method of setting and storing each of the above-mentioned sensor levels in the sensor level storage unit 2 of the fire detector S will be described. The fire detector S is provided with a detector level setting unit 5 composed of a switch, a button, and the like, whereby a detector level can be set for each fire detector (claim 5).

Further, by transmitting setting data from the fire receiver 10 through the multiplex signal line L, each sensor level can be set (claim 6). In this case, the address of each fire detector S is designated from the fire receiver 10, the data in which the type of the detector level, the level value, and the like are set are transmitted, and the content of the detector level storage unit 2 is rewritten.

[0026]

The multiplex transmission type fire alarm system of the present invention has the following effects. According to the first to third aspects, if a detector level such as a fire level is set in the fire detector, the signal is output from the fire detector even if the fire receiver does not perform a reset operation on the fire detector. Just by receiving a fire signal, etc., the status of all connected fire detectors can always be determined accurately, which simplifies the program on the fire receiver side and delays the output of fire alarms, etc. And the reliability of the entire system increases.

According to the fourth aspect, even if the smoke density and the environmental temperature at the place where the fire detector is installed are slightly changed,
Since the fire signal and the fire release signal do not frequently output due to hunting, the condition of the fire receiver and multiple signal lines does not become unstable, and prompt fire notification for the occurrence of fire And so on. According to claims 5 and 6,
Since the detector level of the fire detector can be arbitrarily set for each fire detector, it is possible to perform a fire notification or the like according to each installation environment. In addition, since the detector level can be set collectively from the fire receiver by multiplex transmission, it is not necessary to set the detector level for each fire detector at the time of system introduction, etc., and the trouble is eliminated. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a configuration of a multiplex transmission type fire alarm system according to the present invention.

FIG. 2 is a diagram for explaining an example of the operation of the multiplex transmission type fire alarm system according to the present invention (claim 1).

FIG. 3 is a diagram illustrating another example of the operation of the multiplex transmission type fire alarm system according to the present invention (claims 1 to 3).

FIG. 4 is a diagram for explaining another example of the operation of the multiplex transmission fire alarm system according to the present invention (claim 4).

[Explanation of symbols]

 Reference Signs List A A multiplex transmission type fire alarm system S A fire detector 1 A fire detector 2 A detector level storage unit 3 A comparison and judgment unit 4 A multiplex transmission control unit 5 A detector level setting unit 10 Fire receiver 20 Repeater 30 Smoke prevention interlocking device L Multiple signal line B Sound device

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G08B 17/00 G08B 23/00 530

Claims (6)

(57) [Claims] 1. A fire alarm system comprising a plurality of fire detectors connected to a fire receiver via a multiplex signal line, wherein an address for multiplex transmission is set in each of the fire detectors. A fire detection unit for detecting smoke density and environmental temperature; and a comparison determination unit for comparing and determining a preset fire level and fire release level with respect to the smoke density and temperature levels detected by the fire detection unit. During normal monitoring, a response signal is periodically output through the multiplex signal line in response to a call from the fire receiver, and a fire signal and a fire release signal are output in accordance with the result of the comparison by the comparison / determination unit. And a multiplex transmission control unit for interrupting the output of the fire signal. The fire receiver interrupts and receives a fire signal from the fire detector via the multiplex signal line until a predetermined time elapses. If the not received fire release signal from the same fire detector to the judgment of the fire, the multiplex transmission type fire alarm system configured to output a fire alarm. 2. A fire alarm system comprising a plurality of fire detectors connected to a fire receiver via a multiplex signal line, wherein an address for multiplex transmission is set in each of the fire detectors. A fire detection unit for detecting smoke density and environmental temperature, and a preset fire level, fire release level, forecast level, and forecast release level for the smoke density and temperature level detected by the fire detector A comparison discriminator for comparing and discriminating, and at the time of normal monitoring, in response to a call from the fire receiver, periodically outputs a return signal through the multiplex signal line, and according to a discrimination result of the comparison discriminator. A multiplex transmission control unit that interrupts and outputs a fire signal, a fire release signal, a fire forecast signal, and a fire forecast release signal. The fire receiver receives a fire from the fire detector through the multiplex signal line. If a fire release signal is not received from the same fire detector by the time the preset time elapses after receiving the signal interrupt, a fire is determined and a fire alarm is output, while the multiplex signal is output. If a fire forecast cancellation signal is not received from the same fire sensor by the time specified in advance after the interruption of the fire forecast signal from the fire sensor through the line, the fire forecast is judged. Multiplex transmission fire alarm system that outputs a fire forecast. 3. A fire alarm system comprising a plurality of fire detectors connected to a fire receiver via a multiplex signal line, wherein an address for multiplex transmission is set in each of the fire detectors. Fire detection unit that detects smoke density and environmental temperature, and the preset fire level, fire release level, forecast level, forecast release level, and interlocking with the smoke density and temperature level detected by this fire detector A control level, a comparison / determination section for comparing and determining the interlocking control release level, and at the time of normal monitoring, in response to a call from the fire receiver, periodically outputs a return signal through the multiplex signal line, A multiplex transmission control unit that interrupts and outputs a fire signal, a fire release signal, a fire forecast signal, a fire forecast release signal, an interlock control signal, and an interlock control release signal in accordance with the determination result of the comparison determination unit. The fire receiver does not receive a fire release signal from the same fire detector until a predetermined time elapses after interrupting and receiving the fire signal from the fire detector through the multiplex signal line. In this case, a fire is judged and a fire alarm is output. On the other hand, after receiving a fire forecast signal from the fire detector through the multiplex signal line, the same fire detection is performed until a predetermined time elapses. If the fire forecast release signal is not received from the device, the fire forecast is determined, the fire forecast is output, and after the interlocking control signal is received from the fire detector through the multiplex signal line, If the interlocking control release signal is not received from the same fire detector before the predetermined time elapses, it is determined that the interlocking control is to be performed, and the interlocking device for the smoke control device is interlocked. Multi-transmission type fire alarm system. 4. The method according to claim 1, wherein the fire level and the fire release level, the forecast level and the forecast release level, and the interlocking control level and the interlocking control canceling level, which are criteria for the comparison and discrimination unit, have hysteresis. The multiplex transmission type fire alarm system according to any one of the above. 5. A detector level setting section for setting a fire level and a fire release level, a forecast level and a forecast release level, and an interlock control level and an interlock control release level, which are reference criteria of a comparison discriminator. The multiplex transmission fire alarm system according to any one of claims 1 to 4, further comprising: 6. By transmitting setting data from the fire receiver to the fire detector through the multiplex signal line,
The fire level and the fire release level, the forecast level and the forecast release level, and the interlocking control level and the interlocking control canceling level, which are criteria for the comparing and judging section, are set. Multiple transmission fire alarm system.