JPS5850285Y2 - Flame detector operation test equipment - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an operation testing device for a flame detector.

In general, two types of flame detector operation test equipment are known: one is a simulated test method that electrically creates an alarm state on the flame detector, and the other is a method that tests the operation by actually irradiating the flame detector with light. There is.

The present invention relates to an operation test device that tests the operation of the flame detector by actually irradiating it with light.

Conventionally, in this type of test equipment, a cable dedicated to operation tests is provided separately from the signal/feed line that is drawn out from the receiving device and connected to the flame detector, and the cable is used to conduct tests under the control of the receiving device. A device that drives a light source for operation testing is known.

It is also conceivable to supply current to the light source for operation testing through a signal/power supply line without increasing the number of such cables.

Incidentally, there are flame detectors that detect infrared light emitted from flames in order to prevent malfunctions caused by noise light from automobile headlights or the like.

In order to actually test the operation of such a flame detector by irradiating it with infrared light, a light source that emits infrared light is required.

Generally, a light source that emits infrared light consumes a large amount of power, so if the signal and power supply line from the receiving device is used to send power to the light source that emits infrared light, the receiving device will malfunction. produce defects.

Furthermore, in order to transmit such a large amount of power, a large-capacity line must be used to reduce loss due to line resistance, and a long line has the disadvantage of increasing construction costs.

The present invention eliminates the above-mentioned drawbacks, and provides an operation test device that does not require a large capacity of the signal/feed line from the receiving device to the flame detector, and also does not require a dedicated cable for operation tests. This is what we provide.

An embodiment of the present invention will be described in detail below with reference to FIG.

In FIG. 1, reference numeral 1 denotes a receiving device, and a pair of signal/feed lines 2a drawn out from the receiving device.

A flame detector 3 is connected to 2b.

This flame detector includes a photoelectric conversion element 4 that converts infrared light into an electrical signal, a direct current of a predetermined value or more, and a frequency (5Hz to 30Hz) specific to flame flickering in the signal from the photoelectric conversion element.
a control circuit 6 that detects when an alternating current is included and controls the alarm signal generation circuit 5;
A battery 7 consisting of a CD battery or a large capacity capacitor,
A relay device 8 that is controlled by the operation of the receiving device 1 described later, and an oscillation circuit that is supplied with power current from the battery 7 through the operation of the relay device and that oscillates at a frequency specific to the flickering of the flame described above. 9, and a test infrared light source 10 that is driven by the output of the oscillation circuit and emits infrared light similar to flame light.

The alarm signal generation circuit 5 and the control circuit 6 are connected to the signal/power supply line 2a.

It is configured to be non-polar so that the same operation can be performed regardless of the polarity of 2b.

The relay device 8 consists of a diode D1 and a relay L, and when the polarity of the signal/feed line 2 a t 2 b is positive, the current to the relay L is blocked by the diode D1, but when the polarity is reversed, the relay L is blocked. It is configured to be energized.

The relay L has a contact l, and when it is not energized, the battery 7 is charged through the resistor R, and when it is energized, current is supplied to the oscillation circuit 9 as described above.

The receiving device 1 has a DC power supply 11, a relay 12 for receiving an alarm signal, and a switch 13 for reversing polarity, and the polarity of the signal/feed lines 2a and 2b can be selected by the switch.

In the flame detector operation test device configured as above,
In the normal monitoring state, the signal/power feed lines 2a and 2b are set to positive polarity by the switch 13.

If a fire occurs in this state, the control circuit 6 is activated as described above by the infrared light from the flame via the photoelectric conversion element 4, and the alarm signal generation circuit 5 activates the signal/feeder line 2.
a, 2b are shorted.

Due to this short circuit, the relay 12 is energized by the current from the DC power source 11, and an alarm indicator light is turned on to notify that a fire has occurred.

During an operation test, the switch 13 switches the signal/feed line 2
By setting a t 2 b to the opposite polarity, the relay device 8 is operated, and this operation causes the current from the battery 7 to be supplied to the test infrared light source 10 via the oscillation circuit 9, and the test infrared light source 10 is The photoelectric conversion element 4 is irradiated with light from an infrared light source.

This irradiation causes the control circuit 6 and the like to operate in the same manner as when the light from the flame is irradiated, and it can be confirmed that the relay 12 is energized and the flame detector operates normally as described above.

In the embodiment shown in FIG. 1, a polarity reversing switch is provided as the operation test operating section, but this can be modified in various ways as described below.

That is, FIG. 2 shows another embodiment, and FIG.
Items with the same reference numerals as in the figure indicate items with the same effect.

In the operation test apparatus shown in FIG. 2, the voltage supplied from the receiver 1 to the signal/feed lines 2a and 2b can be varied because the variable voltage source 14, which also serves as the operation test operating section, is used as a DC power source.

On the other hand, the relay device 8 has a relay 15 including a voltage discrimination circuit that discriminates when the voltage of the signal/feed lines 2 a and 2 b has exceeded a predetermined value.

Furthermore, current is supplied to the control circuit 6 via a constant voltage circuit 16.

In such a test device, the relay device 8 is operated by increasing the voltage of the signal/feed lines 2 a and 2 b to a predetermined value or higher using the variable voltage source 14, and a flame is generated as in the one in FIG. Sensor operation tests can be performed.

FIG. 3 shows still another embodiment, and the same reference numerals as in FIG. 2 indicate the same effects.

In the operation test device shown in FIG. 2, alternating current from an alternating current power source 18 is selectively superimposed on the direct current from a direct current power source 11 that is supplied from the receiving device 1 to signal/feed lines 2a and 2b by switching a switch 17. It is configured to

That is, the switch 17 and the AC power supply 18 constitute an operation test operation section.

On the other hand, the relay device 8 connects the signal and power supply lines 2 a and 2 b
It has a capacitor 19 that allows only the alternating current to pass through, a diode D2 that rectifies the alternating current that has passed through the capacitor, and a relay L that is energized by the current from the diode.

In such an operation test device, the relay device 8 described above is operated by flowing alternating current to the signal/feed line by operating the switch 17, and the operation test of the flame detector is performed in the same manner as the one in FIG. be able to.

The present invention is like a diagonal, and it is possible to perform operation tests of flame detectors by remote control from the receiving device without requiring a dedicated cable for operation tests and without increasing the capacity of the signal/feed line. It is possible.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing one embodiment of the present invention, and FIGS. 2 and 3 are block diagrams showing other embodiments, respectively. 1: Receiving device, 2 a, 2 b: Signal and power feed line, 3
: Flame detector, 4: Photoelectric conversion element, 7: Battery, 8: Joint type device, 10: Infrared light source for testing.

Claims (1)

[Scope of utility model registration request] When the flame detector side, which is connected to a pair of signal and power feed lines drawn out from the receiving device and detects infrared rays from the flame, is in a state where power is being supplied to the signal and power feed lines, which is different from the normal monitoring state. a relay device that is driven; an infrared test light source that is activated by the relay device to irradiate a photoelectric conversion element of the flame detector; and a test infrared light source that is powered by the relay device. A battery is provided, and the receiving device is provided with an operation test operation unit, and this operation drives the relay device via the signal and power supply line, and supplies power current from the battery to the test infrared light source. 1. An operation test device for a flame detector, characterized in that an operation test is performed by lighting the flame detector.