JPS63314696A - Fire alarm system - Google Patents

Abstract

PURPOSE:To surely alarm the break-out of a fire by providing a receiver discriminating it as a fire in sensing that a detected smoke density of a smoke sensor giving an output of a detection signal being the digital conversion of an analog data corresponding to the smoke density exceeds a set smoke density and the state is consecutive for a set time. CONSTITUTION:A fire discriminating means connected to smoke sensors 2, 3a digital-converting an analog data corresponding to a smoke density and giving it as a detection signal via a signal circuit (l), provided with a receiver 1 discriminates it as a fire when the detected smoke density of the smoke sensors 2, 3a exceeds the set smoke density and the state is consecutive for a set time. Then either or both of the preset setting smoke density and present set time are changed to increase the setting sensitivity which depends on the set smoke density and the setting time, of at least other smoke sensors 2, 3a when the fire discriminating means gives a discrimination of fire break-out. Thus, the break-out of a fire is surely alarmed.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a fire alarm system.

[Conventional technology]

In conventional automatic fire alarm systems, when one of the multiple smoke detectors or other detectors turns on, line current flows through the signal line, activating the relay in the receiver, and the output contact activates the bell, display, etc. is operating.

[Problem to be solved by the invention]

However, in such a conventional example, in the case of a sensor such as a smoke sensor, the smoke detection concentration at which the sensor is turned on is set to a constant level, so there is a risk of malfunction depending on the installation location. In other words, in places such as meeting rooms where a large number of people gather, smoke from smoking may be detected and a false alarm may be issued, or there is a risk of false alarms being issued in places such as kitchens where there is a heat source and is likely to generate smoke. there were. In particular, when the system is linked to a smoke prevention device, etc., the post-processing caused by false alarms is difficult. Therefore, there are many cases where automatic fire alarm systems are turned off at night due to the fear of such false alarms, and as a result, even if a fire actually occurs, it cannot be detected, resulting in a large number of casualties. This led to very frightening results. The purpose of the present invention is to provide a fire alarm system that can set the sensitivity of fire detection according to the combination of the detected smoke concentration and the time function, thereby making it possible to set the sensitivity according to the situation such as the installation location and improving the reliability. is to provide. 1. Means for Solving the Problems The present invention provides a smoke detector that outputs a detection signal formed by digitally converting analog data corresponding to smoke density; and a receiver having a fire determination means for determining a fire when it detects that the detected smoke concentration exceeds the set detected smoke concentration and continues for a set time, and the receiver has a fire determination means that determines that there is a fire when it detects that the detected smoke concentration exceeds the set detected smoke concentration and continues for a set time, and the receiver has a sensitivity determined by the set detected smoke concentration and the set time. , fire sensitivity level shift F setting means is attached for changing both or either of the currently set detection smoke concentration and the currently set time so as to increase the set sensitivity of at least other smoke detectors when the fire determining means determines that there is a fire; However, in the second invention, the sensitivity determined by the set detected smoke density and the set # interval is changed to both the current set detected smoke density and the current set time, or Sensitivity level shift setting means for changing either one is attached, and in the third invention, according to the set detection smoke concentration and set time of the smoke detector provided corresponding to external equipment such as smoke prevention equipment and fire extinguishing equipment, An interlocking level setting means is attached for changing both or either one of the currently set detection smoke concentration and the currently set time so that the determined sensitivity is switched to a lower sensitivity interlocking level in response to an external command. .

[Effect]

Since the present invention is configured as described above, there is less risk of malfunction due to temporary smoke generation or external disturbances, compared to conventional systems in which sensitivity is determined only by smoke concentration.
As a result, there are no false alarms and high reliability is obtained, and there is no need to use the system incorrectly, such as stopping the system for fear of false alarms, and it is possible to reliably warn of the occurrence of a fire. The sensitivity determined by
Since the fire sensitivity level shift setting means is attached to change both or either one of the current setting times so as to increase the setting sensitivity of at least other smoke detectors when the fire judgment means judges that there is a fire, Once it is determined that a fire has occurred, other smoke detectors can quickly detect the spread of the fire, and as a result, firefighting and evacuation operations can be carried out smoothly by accurately understanding the state of fire spread, resulting in high reliability. can get. Furthermore, in the second invention, daytime and nighttime,
The sensitivity can be changed in response to changes in the environment and management conditions, such as when people are present and when there is no one, and as a result, a state where false alarms will not occur can be set depending on the situation, preventing confusion caused by false alarms. It can be prevented. Furthermore, in the third invention, by simply selecting a smoke detector to be linked to an external device such as a smoke prevention device or a fire extinguishing device and setting it to be linked, the smoke detector can be automatically set to low sensitivity, and the smoke detector can be set to low sensitivity. Sensitivity settings that do not cause malfunction of external equipment such as smoke evacuation equipment and fire extinguishing equipment improve the MM performance of the system, and the interlocking level can be set extremely easily.

[Disclosure of the invention]

The present invention will be explained below with reference to Examples. FIG. 1 shows a basic schematic configuration diagram of one embodiment, and the signal derived from the receiver 1 includes an intelligence type smoke detector 2, a general type smoke detector 3a, and a heat sensor 3b. Connect by mixing them. Receiver I is each intelligence type smoke detector 2
A transmission signal VS consisting of a pulse code signal including an address signal individually assigned to the signal is superimposed on the line voltage or current of the signal fa1 as shown in FIG. It determines the information sent as a return signal from the intelligence smoke detector 2, and monitors the line voltage and line current level of the signal to detect the general smoke detector 3a or the general heat sensor 3b. It is possible to carry out various control operations such as receiving the level signal ■L from. The intelligence type smoke detector 2 can each have its own address set, and when the address signal included in the transmission signal Vs sent out from the receiver 1 matches the self-set address, the transmission signal Vs and the next transmission signal Vs Various information is superimposed and sent back to the receiver 1 in the form of a pulse code signal in a return space provided between the receiver 1 and the receiver 1. When the general type smoke detector 3a or heat sensor 3b detects a predetermined smoke concentration or temperature, it turns on and short-circuits the signal line r through an appropriate resistance, changes the line current or line voltage level, and A fire detection signal is transmitted to the receiver 1 as a signal. Therefore, at normal times, the receiver 1 sequentially calls each intelligence type smoke detector 2, receives information from each intelligence type smoke detector 2, and makes a judgment, and also detects the voltage or current level of the signal port ml. By monitoring the operation of the general type smoke detector 3a or heat sensor 3b, and detecting a steady line voltage or line current by the terminator 4 such as the resistance of the signal line r, a short circuit of the signal port 81 is detected. , to monitor for disconnections. Next, the specific installation of the receiver 1 and the intelligent smoke detector 2 will be explained. As shown in FIG. 3, the receiver 1 is composed of a basic unit 1A and an extension unit) IB.
B can be combined as necessary. The basic unit IA includes a coupling circuit section 5 for interfacing with the signal port #Xl, and the times #! extracted by the coupling circuit section 5! Based on the voltage, the level signals of the general type sensors 3a and 3b are received via the level detection circuit unit 6 which discriminates between voltage levels of short circuit, short circuit, and disconnection, and the return signal received and extracted through the coupling circuit unit 5. A transmission signal modulation/demodulation circuit section 7 demodulates the pulse code signal as a signal and modulates and creates a transmission signal Vs to be superimposed on the signal line l via the coupling circuit section 5, and level detection information discriminated by the level detection circuit section 6. and the information from the intelligence type smoke detector 2 demodulated from the transmission signal modulation/demodulation circuit section 7 to determine the occurrence of a fire, or to identify the location of the fire, and also to detect a disconnection of the signal line l. It can be used to determine the occurrence of a short circuit, and also to detect smoke detectors 2.
Based on the results of these determinations, it can display fire areas, fire alarms, warnings, etc. corresponding to the signal line through the I10 interface 11.
It generates control outputs such as warnings for the area, sensor abnormality indications, signal line abnormality indications, control of smoke prevention equipment and fire extinguishing equipment, etc., and also outputs control outputs such as control outputs for the expansion unit IB through the interface 9.
It consists of a CPU, etc., which performs control and signal processing such as transmitting and receiving information to and from the computer, and also creates a pulse code signal for sequentially calling each intellinoence type smoke detector 2 and sends it to the transmission signal modulation/demodulation circuit section 7. It is comprised of an arithmetic signal processing circuit section 8, a storage section 10 that stores and holds settings for control operations of the arithmetic signal processing circuit section 8, a keyboard 12, and the like. On the other hand, the expansion unit (IB) can send and receive data to and from the basic unit IA via the interface 13, and is a combination table of predetermined sensors and corresponding external equipment such as fire extinguishing equipment and smoke prevention equipment. and a storage unit 14 which stores combination data for setting the combination of the relay means and the number of the signal port #il to which it belongs when a relay means is provided, and the data from the above-mentioned basic 22) IA; Selection control of the smoke prevention device etc. to be controlled from the setting contents of the storage unit 14, display of the operating state of each sensor, display of the operating state of the relay means by displaying the number of the signal port 81 corresponding to the relay means, and furthermore Control operations such as interlocking displays that display the operating status of fire extinguishing equipment, smoke exhaust equipment, etc., control of smoke exhaust equipment, etc. using manual commands from the keyboard 15, and monitoring data of the operating status of smoke exhaust equipment, etc. an arithmetic signal processing circuit section 16 that performs a series of control/signal processing such as input of
5, a display unit 17, and an arithmetic signal processing circuit unit 16. This generates a control output for smoke prevention equipment, etc. Of course, the control of the smoke prevention device and the like may be performed on the expansion unit (IB) side. 13'
is an interface for connecting another expansion unit (IB). The intelligence type smoke detector 2 has a main body composed of a base 2a and a head 2b as shown in FIG. 4, and an internal circuit as shown in FIG. In other words, inside the head 2b are a light beam type smoke detection section 19 that detects smoke, a zero level shift circuit section 20 that constantly detects the zero level of the smoke detection section 19 and performs shift control to stabilize the zero level, and a smoke detection section 19 that detects smoke. an output circuit section 21 that outputs an analog signal according to the smoke concentration detected by the section 19; and a self-check circuit section 2 that detects whether the range in which the zero level is shifted by the zero level shift circuit section 20 exceeds a predetermined range.
3, and a function stoppage determination circuit unit 22 that determines that the function has stopped and generates an "H" signal when the self-check circuit unit 23 outputs a detection signal indicating that the above-mentioned predetermined range has been exceeded. On the other hand, the base 2a removably mounts the head 2b, supplies power to the circuit inside the head 2b, and outputs the output of the output circuit section 21 and the malfunction determination circuit section 22.
It is installed on a mounting surface such as a ceiling surface, and has a level discrimination device inside that discriminates the analog signal from the output circuit section 21 into, for example, three levels and outputs three levels of smoke density data. The circuit section 24 and the level discrimination circuit section 24
At the same time, the output data from the function stoppage determination circuit section 22 is taken in and sent as return information to the receiver 1, and a return signal consisting of a pulse code signal based on this information is created, and the address setting section 25 outputs the output data. Information from reception 8!1 included in transmission signal ■1 when the set address matches the address signal included in transmission signal ■5 transmitted from receiver 1 via signal R1. The arithmetic signal processing circuit unit 26 and the signal processing circuit unit 26, which performs signal processing such as taking in the signal and transmitting the return signal during the return period following the transmission signal #
A coupling circuit section 27 for coupling the transmission signal VS with the signal Xl to extract the transmission signal VS or superimposing the return signal on the signal II&1; When the detection of a high smoke density setting level, that is, low sensitivity, continues for a predetermined period of time in the level discrimination of the section 24, the signal line 1 is short-circuited through an appropriate resistor, and the line voltage is reduced as in the general smoke detector 3a and heat sensor 3b. level,
7 circuit section 28 for changing the current level or impedance level and sending out the level signal 5 through the coupling circuit section 27, and whether the smoke detector functions as an intelligence type or a general type sensor. Select whether to function as a so-called point address type that outputs only a level signal similar to , and also transmits a pulse-1' signal corresponding to its own address to receiving Miso 1 when a level signal is output, that is, when a fire is detected. It is equipped with a type/use setting section 29 etc. to set, and the above-mentioned three-stage smoke concentration discrimination corresponds to type 1, type 2, and type 3 of smoke detectors, for example, 5%, 10%, 15%. and generates corresponding detection signals. Now, in the receiver 1, the following operating conditions can be set in the storage section 10 using the keyboard 12. First, in this system, fire occurrence determination is made based on a combination of the level signal ■L from the general smoke detector 3a and heat sensor 3b, the smoke density from the intelligence smoke detector 2, and a time function. On the receiver 1 side, the detected smoke concentration, which is a condition for determining the occurrence of a fire, and the duration of the detected smoke concentration can be selected and set for each intelligence type smoke detector 2 from the keyboard 12. In other words, there are three levels of detected smoke concentration data returned from the intelligence type smoke detector 2, and the time is 6 seconds and 30 seconds, for example.
There are several types, and one of these detected smoke concentrations can be combined with one of the times, and the sensitivity setting for fire occurrence can be made using two functions: smoke concentration and time. This setting condition is determined by the setting location of each intelligence type smoke detector 2. In addition, the receiver 1 has multiple intelligence type smoke detectors 2.
When each reaches the fire occurrence determination condition, a logical product alarm 8! generates a control output to control the smoke prevention device, fire extinguishing device, etc. It is possible to set and store an address table of combinations of intelligent smoke detectors 2 in a storage section 10 using a keyboard 12 in order to issue a logical AND alarm. Furthermore, receiving ff1f
Be careful with fil! :9 alarms can be issued, and an address table in which each intelligence type smoke detector 2 that requires a caution warning can be selected can be set and stored in the storage unit 10 using the keyboard 12. There is. In the reception 8!1, the transmission signal Vs is superimposed on the line voltage or current of the signal iZ as shown in FIG. The state of each intelligence-type smoke detector 2 is called by calling each intelligence-type smoke detector 2 and sending out information on the detected smoke concentration and monitoring information on the malfunction of each smoke detection unit 19 as a return signal. Check. Now, when the receiver 1 receives a return signal from the intelligence type smoke detector 2 at a predetermined address, the arithmetic signal processing circuit section 8 stores and sets in the storage section 10 the fire occurrence determination signal of the intelligence type smoke detector 2. The detected smoke concentration for the return signal is compared with the detected smoke concentration data in the return signal, and if the detected smoke concentration data is smaller than the set detected smoke concentration, the arithmetic signal processing circuit section 8 determines that no fire has occurred. On the other hand, if the smoke concentration is higher than the detected smoke concentration, the set time is counted by the fire determination timer. The built-in timer continues counting as long as the above-mentioned cyclic call is repeated and the returned detected smoke concentration data does not become less than the set detected smoke concentration, and when the count ends, the detected smoke concentration is exceeded. If it is determined that the set time has been exceeded,
It determines that a fire has occurred and issues an alarm using a bell 31 or the like. By the way, the intelligence type smoke detector 2
is set as a target for a warning requiring attention, first compare the smoke density lower than the set detected smoke density with the detected smoke density data, and if the comparison determines that the detected smoke density data is lower. It is determined that there is no need to issue a caution warning. On the other hand, if the value is high, a caution warning timer starts counting for a predetermined period of time. The above-mentioned cyclic calling is repeated, and until the returned detected smoke concentration data does not fall below the set detected concentration, the timer for caution warning continues to count. If the detected smoke concentration data does not reach a level one level lower than the set detected smoke concentration until the count-up time, the arithmetic signal processing circuit section 8 determines that caution is required, and issues a warning requiring caution as a warning Ia9. By the way, if the detected smoke concentration data exceeds the set detected smoke concentration during the counting period of the caution warning timer, the fire determination timer starts counting and the above-mentioned fire occurrence determination is performed. Then, when the detected smoke concentration data drops below the set detected smoke density while counting by this fire judgment timer, the count time up to the point of drop is memorized and added.
Reset the fire judgment timer count. If the addition result is less than the predetermined time corresponding to the need for attention,
The process returns to the count routine of the caution warning timer. Further, when the above-described added value of the period during which the detected smoke concentration data exceeds the set detected smoke concentration reaches a predetermined time or more, the arithmetic signal processing circuit section 8 determines that caution is required, and issues a warning that caution is required. Now, when determining the occurrence of a fire as described above, it is determined in the same way whether or not the intelligence type smoke detector 2 is set to issue an AND alarm, and if not, 91ji indicating that a fire has occurred is received. An alert is issued from aircraft 1. Also, if it is set to issue a logical product,
Other intelligence-type smoke detectors 26 that are set in combination with the intelligence-type smoke detector 2 determine whether a fire has occurred or not, and if the determination is YES, a fire alarm is received. 8!1. When it is determined that a fire has occurred, a control signal is sent to the smoke prevention device, fire extinguishing device, etc. that is set to be linked in advance to the intelligence type smoke detector 2. The M iso 1 is outputted and activated, and the display sections 17 and 17' display information indicating which sensors and devices are in operation, as well as fire indications for each area. It is preferable to set for all intelligent smoke detectors 2, but smoke density,
This does not apply if the time setting is set to low sensitivity. Furthermore, if at least two smoke detectors 2 connected to the same signal line r issue a warning requiring attention, it may be determined that a fire alarm has been issued. In addition, the logical product alarm is issued when all of the combined intelligence type smoke detectors 2 are determined to have detected a fire outbreak. Of course, a priority determination function may be provided to determine that a fire has occurred if the installed intelligence smoke detector 2 determines that a fire has occurred at the beginning or during the process. Further, the logical product alarm may be used for interlocking operation with the smoke prevention device and the fire extinguishing device, and the occurrence of a fire may be alarmed when each smoke sensor 2 determines the occurrence of a fire. FIG. 6 shows a 70-chart of the arithmetic signal processing circuit unit 8 related to the above-mentioned fire occurrence determination and caution warning warning, and FIGS. 7(a) to (d) show the fire occurrence determination and caution warning warning. The relationship between the comparative operation of the determination and the smoke concentration detected by the intelligence smoke detector 2 is shown. Figure 7(a) shows ■,■,
The setting level of the detected smoke concentration is shown in three stages (■). In the figure, the detected smoke concentration is set to the level (■), and the detected smoke concentration exceeding the level (■) continues for more than the set time T1, that is, it is determined that a fire has occurred. It shows the condition. Fig. 7(b) shows that the time when the set level ■ was exceeded is shorter than the set time TI, and the time when the time exceeded the level I, which is one step lower for distinguishing the caution required, is shorter than the predetermined time TII for distinguishing the caution required. This indicates a short state, that is, a state in which the state is determined to be a temporary state due to a disturbance, etc., and neither a fire alarm nor a warning requiring attention is issued. FIG. 7(c) shows a state in which level I continues for a predetermined time T1 or more, that is, a state in which it is determined that it is necessary to issue a caution alarm due to either a fire or a setting failure. . In addition, in the seventh flash (d), the detected smoke concentration intermittently exceeds the set level ■, and the total time of exceeding is the predetermined time TI.
This state also indicates a state in which it is determined that it is necessary to issue a caution warning, similar to FIG. 7(c). Therefore, by issuing the above-mentioned caution warning, it is possible to easily discover incorrect settings, and the setting sensitivity of each smoke detector 2 can be calibrated after the system is installed, thereby optimizing the system without false alarms. It is. By the way, the fire sensitivity level shift shown in chart 70 of FIG. It has become. In other words, for example, if the standard sensitivity is a combination in which the setting time is 6 seconds and the detected smoke concentration is 10%, the sensitivity of the intelligent smoke detector 2, which is set to a lower sensitivity than this standard sensitivity, will be one step higher. As such, the arithmetic signal processing circuit section 8 switches either or both of the set time and the set detection smoke density corresponding to the target intelligence type smoke detector 2 for the set fire sensitivity level shift when determining the occurrence of a fire. . Therefore, at the same time as determining the occurrence of a fire, the fire detection sensitivity corresponding to the target intelligence type smoke detector 2 increases, making it possible to quickly detect the state of fire spread. By the way, depending on changes in the environment and management conditions such as daytime and nighttime, when people are present and when there are no people, etc., it may be necessary to change the fire detection sensitivity corresponding to each intelligent smoke detector 2, but in this system, the keyboard The intelligence type f! is selected and set by command input from 12 or by a command automatically added at a preset time. The arithmetic signal processing circuit section 8 has a sensitivity level shift function for switching the sensitivity of the A sensor 2. In other words, you can switch to low sensitivity during the daytime or during manned periods when malfunctions such as cigarette smoke are likely to occur, or conversely, set it to high sensitivity during the daytime or during manned periods where you can deal with false alarms, and then set it to high sensitivity at night or during unmanned periods. In some cases, the sensitivity is set to low. In this case, the sensitivity changing element may be programmed to switch the set time to the long time side, or to set the set detected smoke concentration one step lower if the set time is set to the long time side. Furthermore, in this system, there is a fire extinguishing device that is linked to the specified smoke detector 2, a smoke prevention device, etc. ￥lS When a fire occurrence is determined by the smoke detector 2 that automatically responds by installing a device, the corresponding external device 8! It has an interlocking function that operates the smoke detector 2, but when the smoke detector 2 to be linked is set using the keyboard 12, the setting sensitivity corresponding to the smoke detector 2 is automatically switched and set to the low sensitivity side. Equipped with a linked level setting function. Now, as mentioned above, when a fire outbreak or a warning requiring attention is issued by the receiver 1, the receiver 1
At the next access, alarm confirmation information is sent as a transmission signal VS, and when the smoke detector 2 receives this information, the light emitting diode 30 is activated by the operation of the arithmetic signal processing circuit section 26.
It lights up to indicate the operation. This display is displayed on system 8 during test operations such as construction and maintenance.
! This makes it easy to determine whether or not the function is operating normally. Now, the intelligence type smoke detector 2 which has received the alarm confirmation information controls the operation of the 7/7 circuit section 28 so as to stop the output as a general type sensor which is a backup function. Next, the operation of the intelligence type smoke detector 2 will be explained. The smoke detection section 19 of the smoke detector 2 detects that the light emitted from the light emitting section 19a is scattered or blocked by smoke and is received by the light receiving section 196, and detects the amount of received light, that is, the smoke concentration. Zero level shift circuit for analog signal according to ? This is generated via B520 and the output circuit section 21. The 7-narok signal outputted from the output circuit section 21 is discriminated by the level discrimination circuit section 24 into the above-mentioned three levels of detected smoke concentration, and the discriminated data is taken into the arithmetic signal processing circuit section 26. Based on this, the detected smoke concentration data is sent back to the receiver 8!1 via the coupling circuit section 27. Of course, the analog signal is A/D converted without discrimination, and the raw data of the detected smoke concentration is converted into a low-sensitivity signal discriminated by the level discrimination circuit section 24. If there is a corresponding detection, this detected amount is cut by a built-in timer, and when a predetermined time is exceeded, the signal R1 is short-circuited via a resistor and a level signal VL similar to that of a general smoke detector is output from the coupling circuit section 27. For example, the arithmetic signal processing circuit section 2 using a CPU
Even if 6 causes trouble due to noise or the like, a smoke detection signal can be generated regardless of the operation of the arithmetic signal processing circuit section 26, and a so-called backup function can be achieved. Of course, if the calculation signal processing circuit $26 is normal and returns detected smoke concentration data, is it received? j! According to the alarm confirmation information from the 11th side, as mentioned above, the 7th circuit section 2
The output of the smoke detection signal from 8 is stopped. In addition, the 7th circuit section 28 is a level discrimination circuit! 24 may be provided with a discrimination function for the fourth stage high smoke concentration detection level, and the level discrimination circuit section 24 may operate when detecting this high smoke concentration. The zero level shift circuit section 20 is connected to the light T surplus section 1 of the smoke sensing section 19.
This circuit is for correcting the zero level that occurs when 9c becomes dirty or deteriorates. In other words, if the output level of the smoke detector 19 when the smoke concentration is zero is zero level, this zero level was set at point A in the first state as shown in Figure 8, but due to dirt and deterioration, The zero level starts to rise or fall gradually like a peak or a convex curve, but the zero level shift circuit section 20 detects this rise or fall and always shifts the zero level to correspond to the peak or convex curve. be. Further, the self-check circuit section 23 has a zero level shift range of the zero level shift circuit section 20 x shown in FIG.
If the range of 1x' is exceeded, it is determined that the function has stopped, and a function stop detection signal is output to the function-stop determination circuit section 22. The range of the zero level shift is determined by the smoke detection ability of the smoke detection section 19, allowable dirt, and degree of deterioration. Now, at the same time as the function stoppage detection signal is input, the function stoppage determination circuit section 22 switches its output from 'L' to "H" to notify the arithmetic signal processing circuit section 26 that the function of the smoke detector 19 has stopped. When the signal processing circuit section 26 is called by the receiver 1, the function stop data is returned to the receiver 1 side, and the receiver 1 side detects the smoke detection section 1 of the smoke detector 2 concerned.
The display section 17 or 17' indicates that the function of 9 has stopped. Therefore, with this display, the administrator can immediately replace the smoke detector 2, thereby preventing false alarms. In this way, in this system, both the receiver 8!1 and the smoke detector 2 are made intelligent to divide the functions, and furthermore, the general smoke detectors 3a and 3b are allowed to coexist, increasing the reliability of the system. Moreover, by constantly calling the intelligence-type smoke detector 2 from the receiver 8!1, the detected smoke concentration data from the smoke detector 2 is monitored and the status of the smoke detector 2 is constantly monitored, ensuring reliable system operation. ing. [Effects of the Invention] The present invention provides a smoke detector that outputs a detection signal formed by digital conversion of analog data corresponding to smoke density, and a device that connects the smoke detector to the signal circuit via a signal circuit! - The receiver is equipped with a fire determination means that determines a fire when it detects that the smoke concentration detected by the smoke detector exceeds the set detection smoke concentration and continues for a set time. Compared to those whose sensitivity is determined only by concentration, temporary smoke generation,
The risk of malfunction due to external disturbances is reduced, and as a result, there are no false alarms, resulting in high reliability.Also, there is no need to use the system incorrectly, such as shutting down the system due to fear of alarm, and it is possible to reliably warn of the occurrence of a fire. effective,
Furthermore, the sensitivity determined by the set detection smoke concentration and the set time is set such that when the fire determining means determines that there is a fire, at least the set sensitivity of the smoke detector of the pond is increased. Since it is equipped with a fire sensitivity level shift setting means for changing, once a fire has occurred, other smoke detectors can quickly detect the spread of the fire.As a result, fire extinguishing activities can be carried out by accurately understanding the state of fire spread. This has the effect of making it possible to carry out evacuation activities smoothly and achieving high reliability. Furthermore, the second invention is provided with a receiver configured as described above, and is configured to lower the sensitivity of a predetermined smoke detector while a sensitivity shift command is input, with the sensitivity determined by the set detection smoke concentration and the set time. Since it is equipped with a sensitivity level shift setting means that changes both or either of the currently set detection smoke concentration and the currently set time, it is possible to prevent changes in the environment and management conditions such as daytime and nighttime, when there are people and when there are no people. The sensitivity can be changed in accordance with the situation, and as a result, a state in which false alarms will not occur can be set depending on the situation, and confusion caused by false alarms can be prevented. Furthermore, in the third invention, the sensitivity determined by the set smoke concentration and set time of a smoke detector provided corresponding to an external device such as a smoke prevention device or a fire extinguishing device is further provided in response to an external command. The device is equipped with an interlocking level setting means that changes both or either of the currently set detection smoke concentration and the currently set time so that the interlocking level is switched to a lower sensitivity interlocking level. By simply selecting a smoke detector to be linked to the device and setting it to be linked, the smoke detector can be automatically set to low sensitivity, and external equipment such as smoke exhaust equipment and fire extinguishing equipment can be set to low sensitivity without the risk of malfunction. This has the effect of increasing the reliability of the system and making it extremely easy to set the interlocking level.

[Brief explanation of drawings]

FIG. 1 is a schematic overall diagram of the present invention, FIG. 2 is a signal waveform diagram used in the same, and FIG. 3 is a circuit block diagram of the same receiver.
Fig. 4 is an exploded perspective view of the body of the intelligence type smoke detector shown above, Fig. 5 is a circuit block diagram of the intelligence type smoke detector shown above, and Fig. 6 is a 70° diagram for explaining the operation of the above intelligence type smoke detector.
- Charts, Figures 7(a) and 7(d) are diagrams for explaining the operation of the same unit, Figures 8 and #9 are diagrams for explaining the operation of the zero level shift circuit section, 1 is the receiver, 2 is the diagram for explaining the operation of the same unit. Intelligence type smoke detector, 3a is a general type smoke detector, 3b is a general type heat sensor, 8.16 is an arithmetic signal processing circuit section, 10.14 is a storage section, 12.15 is a keyboard, i is a signal line, 31 is a bell, Vs is a transmission signal, and ■ is a level signal.

Claims (9)

[Claims] (1) A smoke detector that outputs a detection signal formed by digitally converting analog data corresponding to smoke concentration, and is connected to the smoke detector via a signal line, and the smoke concentration detected by the smoke detector is set and detected. a receiver having a fire determination means that determines a fire when it detects that the smoke concentration has exceeded a set time and has continued for a set time; The present invention is characterized by being provided with fire sensitivity level shift setting means for changing both or either of the currently set detection smoke concentration and the currently set time so as to increase the set sensitivity of at least other smoke detectors when it is determined that fire alarm system. (2) The receiver is provided with selection and setting means for selectively setting the detected smoke concentration set in the plurality of stages and the set time set in the plurality of stages, respectively, in multiple stages. Fire alarm system described in scope 1. (3) Connect a general type sensor to the signal line that, when detecting smoke or heat at a predetermined concentration, changes the signal line voltage level, current level, etc. to a predetermined level and transmits the detection output as a level signal to the receiver side. A patent characterized in that a smoke sensor that generates a detection signal corresponding to smoke concentration transmits detection data based on the detection signal to a receiver by a transmission signal superimposed on the signal line. A fire alarm system according to claim 1 or 2. (4) A smoke detector that outputs a detection signal formed by digitally converting analog data corresponding to smoke concentration, and is connected to the smoke detector via a signal line, and the smoke concentration detected by the smoke detector is set and detected. a receiver having a fire determination means that determines a fire when it detects that the smoke concentration exceeds the smoke concentration and continues for a set time; A fire alarm system comprising a sensitivity level shift setting means for changing either or both of the currently set detected smoke concentration and the currently set time so as to lower the sensitivity of the smoke detector. (5) The receiver is provided with selection setting means for separately setting the set concentration set in the plurality of stages and the set time set in the plurality of stages, respectively. Fire alarm system. (6) Connect a general type sensor to the signal line that, when detecting smoke or heat at a predetermined concentration, changes the signal line voltage level, current level, etc. to a predetermined level and transmits the detection output as a level signal to the receiver side. A patent characterized in that a smoke sensor that generates a detection signal corresponding to smoke concentration transmits detection data based on the detection signal to a receiver by a transmission signal superimposed on the signal line. A fire alarm system according to claim 4 or 6. (7) A smoke detector that outputs a detection signal formed by digitally converting analog data corresponding to smoke concentration, and is connected to the smoke detector via a signal line, and the smoke concentration detected by the smoke detector is set and detected. It is equipped with a receiver that has a fire determination means that determines a fire when it detects that the smoke concentration has exceeded and continued for a set time, and a smoke detector installed in correspondence with external equipment such as smoke prevention equipment and fire extinguishing equipment. Interlocking that changes both or either of the currently set detected smoke concentration and the currently set time so that the sensitivity determined by the set detected smoke concentration and set time is switched to a lower sensitivity linked level in response to an external command. A fire alarm system comprising a level setting means. (8) The receiver is provided with selection and setting means for individually selecting and setting the set concentration set in the plurality of stages and the set time set in the plurality of stages, respectively. fire alarm system. (9) Connect a general type sensor to the signal line that, when it detects smoke or heat at a predetermined concentration, changes the signal line voltage level, current level, etc. to a predetermined level and transmits the detection output as a level signal to the receiver side. A patent characterized in that a smoke sensor that generates a detection signal corresponding to smoke concentration transmits detection data based on the detection signal to a receiver by a transmission signal superimposed on the signal line. A fire alarm system according to claim 7 or 8.