JPH0143261B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a functional testing device for a scattered light type smoke detector.

Scattered light smoke detectors (hereinafter referred to as detectors) generate alarm signals when the light emitting surface of the light emitting element or the light receiving surface of the light receiving element becomes dirty, and false alarms occur when the inner wall surface of the dark box for smoke detection becomes dirty. Therefore, it is required by law to periodically check the function of the sensor.
For inspection, smoke is applied to the sensor installed on the ceiling etc. using a smoke tester, and pass/fail is determined based on whether it operates within a specified time, or the sensor is removed from the ceiling etc. This is done by setting it in a smoke detector sensitivity tester and using this tester to determine whether the smoke detection sensitivity is within the normal range.

However, the former requires at least two people: one to operate the smoke tester at the detector installation location, and one to check whether the detector is working at the receiver side. There are problems such as the method of communication between the equipment location and the receiver, and the fact that the detectors get dirty due to the smoke generated from the smoke tester. It takes a lot of time to do this, and when installing it after the test, it can result in poor contact or forgetting to attach it due to insufficient installation.

In view of the above points, it is an object of the present invention to enable a single person to perform a functional test of a sensor by remote control from a receiver or repeater installation location without having to go to the location where the sensor is installed.

Another purpose is to accurately check the functionality of the sensor and to ensure that the functionality test does not cause any trouble to the sensor.

First, the first invention provides a light emitting element for smoke detection and testing, a light receiving element for smoke detection provided at a position that does not directly receive light from the light emitting element, and a test for directly receiving the light output of the light emitting element. one terminal of the smoke detection light receiving element is connected to one terminal of the amplifier circuit, and the other terminal of the light receiving element is connected to one terminal of the test light receiving element, The other terminal of the test light receiving element is connected to the other terminal of the amplifier circuit via a changeover switch, and the other terminal of the amplifier circuit and the other terminal of the smoke detection light receiving element are connected via the switch. and connecting a plurality of resistors R ₁ and R ₂ in parallel between both terminals of the test light receiving element via a switch,
This is a functional test device for a scattered light type smoke detector in which the output terminal of the amplifier circuit is connected to a switching circuit.

Embodiments of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, 1 is a light emitting circuit, 2 is a light emitting element for smoke detection and testing, such as a light emitting diode, and 3 is a light receiving element for smoke detection, such as a solar cell. , light emitting element 2
A light shielding plate 4 is provided between the smoke detection light receiving element 3 and the smoke detection light receiving element 3.
The light from the light emitting element 2 is prevented from directly entering the light receiving element 3 for smoke detection. Reference numeral 5 denotes a light receiving element for testing, which is installed at a position where it can directly receive the light output of the light emitting element 2 and is not affected by external light. Connecting one terminal of the smoke detection light receiving element 3 to one terminal of the amplifier circuit 6,
The other terminal of the light receiving element 3 is connected to one terminal of the test light receiving element 5, and the other terminal of the light receiving element 5 is connected to the other terminal of the amplifier circuit 6 via a changeover switch 7. , a low resistance R ₁ ,
Connect R ₂ in parallel. 9 is a switching circuit,
It is operated by the output of the amplifier circuit 7.

FIG. 2 is a circuit diagram of FIG. 1, and the operation of this embodiment will be explained below with reference to these drawings. Normally, that is, during fire monitoring, relays 10 and 11 operate as follows.
Both are inactive and the changeover switches 7 and 8
All contacts are in normally closed position 7.
A, 8a, only the light reception output of the smoke detection light receiving element 3 is input to the amplifier circuit 6, and the switching circuit 9 is operated as the amount of smoke in the smoke detection dark box (not shown) increases. During a test, when an inactivation test signal is sent from a receiver (not shown), the transistor 12 is activated.
OFF, the R-S latch 13 is set, the relay 10 is operated, and the changeover switch 7, which is the contact point of the relay 10, is switched to the normal oven position 7b. As a result, the light receiving output appearing at the resistor _R1 of the test light receiving element 5 is added to the light receiving output of the smoke detection light receiving element 3, and a non-displacement test is performed.
Also, when an operation test signal is sent from the receiver, transistors 12 and 14 are turned off and R
-G latch 13 is reset, and R-
S latch 15 is set, relay 10 continues to operate, and relay 11 operates to close relay 1.
The changeover switch 8, which is the first contact, is switched to the normal oven side position 8b. As a result, the light receiving output appearing at the resistor R2 of the test light receiving element ₅ is added to the light receiving output of the smoke detection light receiving element 3, and an operation test is performed. The resistance values of these resistors R ₁ and R ₂ are as follows:
Set _R1 so that the output of the amplifier circuit 6 is below the threshold of the switching circuit 9, and set _R2 so that the output of the amplifier circuit 6 exceeds the threshold of the switching circuit 9 if the sensor function is normal as an operation test. Set.
By setting the resistance value in this way, if the output of the amplifier circuit 6 becomes less than the threshold value of the switching circuit 9 during the inoperation test, the sensor function is judged to be normal and the switching circuit 9 does not operate, so that it is not possible to exceed the threshold value. If a false alarm is likely to occur, that is, an abnormality is determined, the switching circuit 9 operates and sends a signal to the receiver, and if the output of the amplifier circuit 6 exceeds the threshold of the switching circuit 9 during the operation test, the sensor function is activated. is determined to be normal and the switching circuit 9 operates to send a signal to the receiver, and if it is less than that, it is determined to be in a misreporting state where misreporting is likely to occur, that is, it is determined to be abnormal, and the switching circuit 9 does not send out a signal. Here, we will explain in detail the normal and abnormal states of the sensor.
Every time the light emitting element 2 emits light, diffusely reflected light (internal noise light) is generated on the inner wall surface of the dark box, and the smoke detection light receiving element 3 receives this internal noise light to generate a noise output N. When smoke enters the dark box, scattered light is generated by the smoke, and the smoke detection light receiving element generates a light receiving output that is the sum of the light receiving output N of the internal noise light and the scattered light output S due to the smoke, and this light receiving output is at the fire level. When the temperature reaches 1, the switching circuit 9 is activated and sends a fire signal to the receiver. Considering this as a normal state, if the light receiving surface of the smoke detection light receiving element 3 becomes contaminated, the light receiving output of the smoke detection light receiving element 3 will decrease, and therefore, assuming that the amount of internal noise light is the same as in the normal state. , since the light receiving output of the light receiving element 3 decreases in proportion to the washing,
In the event of a fire, unless the amount of light scattered by smoke is greater than the normal state, that is, unless the smoke density becomes dense, the light receiving output of the light receiving element 3 will not reach the fire level, resulting in a false alarm. Furthermore, when dust accumulates on the inner wall surface of the dark box, the internal noise light N increases, and the noise light output N of the light receiving element 3 increases compared to the normal state, so the amount of light scattered by smoke is smaller than the normal state, which causes the smoke density to decrease. Even if the predetermined level is not reached, the light receiving element 3
The received light output reaches the level of a fire, causing a false alarm. The relationship between the light reception output N of noise light, the light reception output S of light scattered by smoke, and the sensor state is as shown in Figure 3, and the state (1) when the noise light reception output N is at the normal reference level is as shown in Figure 3. Normal, at the lower limit level (2)
The status is a failure state, that is, an abnormality, and is at the upper limit level.
State (3) is a false alarm state, that is, an abnormality.

The results of the above functional test are sent to a receiver (not shown) as a normal or abnormal signal. After the test is completed, when a restoration signal is sent from a receiver (not shown), transistors 12, 14, and 16 are turned off, R-S latches 13, 15, and 17 are reset, and the state before the start of the test is restored. Ru. Note that if an address circuit 18 composed of, for example, an oscillator with a different frequency is provided for each sensor to modulate the signal output from the sensor, it is possible to determine which sensor the signal is from.

Next, a second invention related to the first invention provides a light-emitting element for smoke detection and testing, a light-receiving element for smoke detection provided at a position that does not directly receive light from the light-emitting element, and A test light-receiving element that directly receives the light output is provided, one terminal of the light-receiving output for smoke detection is connected to one terminal of the amplifier circuit, and the other terminal of the light-receiving element is connected to one of the test light-receiving elements. a switch that connects the other terminal of the test light-receiving element to the other terminal of the amplifier circuit, and connects a resistor _R3 between both terminals of the test light-receiving element to short-circuit the terminals. , a comparison circuit is connected to the output terminal of the amplifier circuit, and a switching circuit is connected to the comparison circuit via a memory circuit for storing the functional state of the sensor. .

Hereinafter, an embodiment of the present invention will be explained with reference to FIG. 4 and FIG. 5, which is a circuit diagram of FIG.
0 is connected, and a memory circuit 21 is further connected to the comparator circuit 20. Normally, both fire monitoring and function inspection are performed, and the results of the function inspection are memorized. When a test signal is received from a receiver (not shown), etc., the function is activated. The point is that a normal signal or an abnormal signal is sent out based on the test results stored in memory. That is, one terminal of the smoke detection light receiving element 3 is connected to one terminal of the amplifier circuit 6, and the other terminal of the light receiving element is connected to one terminal of the test light receiving element 5. The other terminal of the element 5 is connected to the other terminal of the amplifier circuit 6, and a resistor is connected between both terminals of the test light receiving element 5.
A switch 25 is provided to connect R ₃ and short-circuit the terminals, and a comparison circuit 20 for determining the sensor state is connected to the amplifier circuit 6.
Connect the switching circuit 9 to 0. This comparison circuit 20 includes a fire comparator 28, a false alarm comparator 26, and a false alarm comparator 27. The fire comparator 28 is connected to the switching circuit 9, and the fire comparator 28 is
The false alarm comparator 27 is connected to a storage circuit 21 for storing the sensor status, and the storage circuit 21 is connected to the switching circuit 9. In FIG. 4, parts having the same reference numerals as those in FIGS. 1 and 2 have the same functions and operations.

Next, to explain the operation of this embodiment, the relay 24 is normally turned ON and OFF by the Q output of J-KF/F23 (which alternately outputs H and L by the f/2m output of the frequency dividing circuit 35). Repeat this to open and close the changeover switch 25, which is the contact point of the relay 24.
When the relay 24 is OFF, the changeover switch 25
short-circuits the output resistance _R3 of the test light receiving element 5, so only the output of the smoke detection light receiving element 3 is input to the amplifier circuit 6, fire monitoring is performed, and relay 2
4 is ON, the changeover switch 25 is open, so the output of the test receiving element 5 is added to the output of the smoke detection light receiving element 3 and input, and a functional test is performed. Note that the function is determined by the false alarm comparator 26 as to whether or not the received and inverted amplified output of the amplifier circuit 6 has reached the lower limit of the normal level range, which is the false alarm level. It is determined whether the received light inversion amplification output of No. 6 has reached the upper limit of the normal level range, which is the false alarm level. relay 2
4. Light receiving output (the sum of the smoke detection light receiving element 3 output and the test light receiving element 5 output), amplifier circuit 6
and the comparators 26, 27, 2 of the comparison circuit 20
The normal level relationship of 8 is as shown in Fig. 6, but when the function goes into the amplification state, the output of the amplifier circuit 6 will not fall below the loss level, and when the function goes into the false alarm state, the output of the amplifier circuit 6 will become a false alarm. It will fall below the level. Note that the reference level voltages of the comparators 26, 27, and 28 are as follows: fire comparator 28 > false alarm comparator 26 > false alarm comparator 27, but this is because the fire comparator 28 is forced to operate during the test. This is to check the operation of the circuit parts used at the time of occurrence. In FIG. 6, 1 indicates the time of fire monitoring, and 2 indicates the time of function test.

When the received light output is within the normal level range during function monitoring, both the false alarm comparator 26 and false alarm comparator 27 output L, and the AND circuit 29 outputs H, so the Q output of D-F/F30 is normal. If the received light output is outside the normal level range, either the false alarm comparator 26 or the false alarm comparator 27 will go high.
Since it becomes an output, the AND circuit 29 becomes an L output and a D
-The Q output of F/F30 becomes L level indicating an abnormality. The L level of the Q output of this DF/F30 continues while the received light output is outside the normal level range, and when the received light output returns to within the normal level range, the Q output becomes H level. When a test signal is received from a receiver (not shown), the transistor 36 is turned off.
R-S latch 31 is set and relay 24 is turned on.
state, the changeover switch 25 is in the open state, and the light receiving outputs of the smoke detection light receiving element 3 and the test light receiving element 5 are input to the amplifier circuit 6, and the fire comparator 28 is activated by the light receiving amplified output as shown in FIG. When the fire is monitored as shown in 1, the output becomes L. At this time, if the received light output is within the normal level range, the Q output of the D-F/F30 is at the H level, and all circuits are normal, the L output of the fire comparator 28 during fire monitoring will cause the R-S The Q output of latch 32 is set to H and gate 33
is opened and a normal signal is sent to a receiver (not shown). Furthermore, if the previous light receiving output is in a false alarm state, the R-S latch 32 is set by the L output of the fire comparator 28 based on the light receiving outputs of the smoke detection light receiving element 3 and the test light receiving element 5, as in the normal state. The gate 33 is opened, but since the Q output of the DF/F 30 is in the L state indicating an abnormality, an abnormal signal having a repetition frequency different from that of the normal signal is sent to a receiver (not shown).

Further, if the immediately preceding light reception output is in a misreport state, the R-S latch 32 is set to H as in the case of a false alarm, thereby opening the gate 33 and sending out an abnormal signal to the receiver or the like. When the light-emitting element 2 stops emitting light due to a disconnection or the like, and both the smoke detection light-receiving element 3 and the test light-receiving element 5 no longer produce light reception output, the AND circuit 29 no longer produces an H output, so the D-F/F30 Q output becomes L state. Even if a test signal is received from a receiver or the like and the R-S latch 31 is set and the relay 24 is turned on, the smoke detection light receiving element 3 and the test light receiving element 5
does not produce a light reception output, so unlike the above, the comparator 28 continues to output H, and the AND circuit 34
This causes the Q of the R-S latch 32 to
The output is not set to H but remains low. Therefore, the gate 33 is not opened and no signal is sent to the receiver etc. even though the test signal is received.

In this way, after detecting a test signal on the receiver side (not shown), it is possible to determine whether the sensor is functioning normally ( It is possible to determine whether the sensor is in a state where a normal signal is received), a function causes a missed or false alarm (when an abnormal signal is received), or a sensor is malfunctioning (no signal state). After the test, when a recovery signal is sent from a receiver (not shown), transistors 36 and 37 are activated.
OFF, R-S latches 31 and 32 are reset, D-F/F30 is cleared, and the state before the start of the test is restored.

Since the present invention is configured as described above, the function test of the sensor can be performed by one person by remote control from the location where the receiver is installed. In addition, normally, the presence or absence of a fire phenomenon is determined based on the light receiving output of the smoke detection light receiving element, and during testing, the light receiving output of the test light receiving element is added to the light receiving output of the smoke detection light receiving element, and the magnitude of both light receiving outputs is determined. It can be determined whether the sensor function is normal or abnormal. Furthermore, since the present invention does not use smoke for testing, the light-emitting surface of the light-emitting element and the light-receiving element on the light-receiving surface are not contaminated, and the test results are similar to the test method using smoke. .

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the first invention, FIG. 2 is a circuit diagram of FIG. 1, FIG. 3 is a diagram showing the relationship between the sensor state and the received light output, and FIG. FIG. 5 is a circuit diagram of FIG. 4, and FIG. 6 is a time chart of the received light output during fire monitoring and function testing. 2... Light emitting element for smoke detection and testing, 3... Light receiving element for smoke detection, 5... Light receiving element for testing, 6... Amplifying circuit, 7, 8, 25... Selector switch, 20...
...comparison circuit, 21...memory circuit.

Claims (1)

[Scope of Claims] 1. A light-emitting element for smoke detection and testing, a light-receiving element for smoke detection provided at a position that does not directly receive light from the light-emitting element, and a light-receiving element for testing that directly receives the light output of the light-emitting element. a light receiving element is provided, one terminal of the light receiving element for smoke detection is connected to one terminal of an amplifier circuit,
and connect the other terminal of the light receiving element to one terminal of the test light receiving element, connect the other terminal of the test light receiving element to the other terminal of the first stage amplifier circuit via a changeover switch, and The other terminal of the amplifier circuit and the other terminal of the light receiving element for smoke detection are connected via the changeover switch, and a switch for inactivation test is connected between both terminals of the light receiving element for testing. A functional test of a scattered light smoke detector, characterized in that a resistor R ₁ and a resistor R ₂ for operation testing are connected in parallel, and the output terminal of the amplifier circuit is connected to a switching circuit for determining a functional test result. Device. 2. A light-receiving element for smoke detection and testing, a light-receiving element for smoke detection provided in a position that does not directly receive light from the light-receiving element, and a light-receiving element for testing that directly receives the light output of the light-receiving element, and Connect one terminal of the smoke detection photodetector to one terminal of the amplifier circuit,
and connect the other terminal of the light receiving element to one terminal of the test light receiving element, connect the other terminal of the test light receiving element to the other terminal of the amplifier circuit, and connect both ends of the test light receiving element. A resistor _R3 is connected between the output terminals of the test photodetector, a switch is provided to short-circuit the terminals, and a comparison circuit is connected to the output terminal of the amplifier circuit, so that the comparison circuit has no function. 1. A functional test device for a scattered light smoke detector, characterized in that a switching circuit for sending out a normal signal or an abnormal signal is connected via a storage circuit for storing test results.