JP2007264847A - Operation tester for fire detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operation tester for a flame detector that can reproduce an artificial light source having the same spectral ratio as fire flames without using an infrared bandpass filter having a transmission characteristic for a carbon dioxide resonance radiation band. <P>SOLUTION: Illumination light from a flashing continuous light source can reach detection elements in the same spectral ratio as fire flames owing to the area ratio of a plurality of apertures formed for the detection elements respectively to restrict passage through light shields, to thereby reliably actuate the multi-wavelength flame detector. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides an operation tester for a flame detector capable of reproducing a simulated light source having the same spectral ratio as that of a fire flame.

Conventionally, an operation tester for a fire detector has been provided with a flashing light source or a chopped heat source and an infrared bandpass filter having transmission characteristics in the carbon dioxide resonance radiation band.
JP-A-11-110657 (FIG. 1)

  Conventional fire detector operation testers are provided with a flashing light source or a chopped heat source and an infrared bandpass filter that transmits only the infrared light of the carbon dioxide resonance band. In this case, since infrared rays other than near 4.3 μm are blocked, for example, the first infrared detecting element having sensitivity only to the infrared rays in the carbon dioxide resonance radiation band is irradiated with test light, for example, 3.5 μm. The test light is not irradiated to the second infrared detecting element that detects a nearby wavelength. Therefore, it cannot be determined whether the second infrared detecting element is normal or malfunctioning.

  On the other hand, in order to irradiate a plurality of infrared detection elements with a radiation spectrum shape emitted by a flame, it is necessary to provide an infrared bandpass filter for each, and the cost increases as the number of infrared detection elements increases.

  The present invention has been made to solve the above problems, and provides a fire detector operation tester capable of irradiating the same spectral ratio as a fire flame with a simple configuration with respect to a multi-wavelength fire detector. The purpose is to do.

  An operation tester for a fire detector according to the present invention includes a bottomed cylindrical hood that is in contact with a flame detector of a fire detector composed of a plurality of light receiving elements, and a light source that flashes while being fixed to the bottom surface of the hood. And a light shielding plate mounted in the hood so that the optical axes of the light sources are orthogonal to each other, and a plurality of apertures provided on the light shielding plate to restrict the passage of direct light or diffracted light from the light source. It is what.

  In addition, at least two light shielding plates are installed in parallel at a predetermined interval so that a plurality of apertures are coaxial. Further, the areas of the plurality of apertures are individually set so that the test light that has passed through the plurality of apertures has the same spectral ratio of the flame due to fire and is applied to the fire detector.

  The operation tester of the fire detector of the present invention has the same spectral ratio as the flame caused by the fire due to the area of the aperture provided in each detection element, and the irradiation light from the flashing light source reaches each detection element. Even a wavelength flame detector can be operated reliably. In addition, since the irradiation light does not block infrared rays other than the carbon dioxide resonance radiation band, it is possible to determine when the detection element that detects only the carbon dioxide resonance radiation band is faulty.

  FIG. 1 is a schematic diagram showing a positional relationship in which the operation tester 30 of the fire sensor 40 according to the first embodiment of the present invention tests the fire sensor 40. The fire detector 40 includes a first light receiving element 41A having a first bandpass filter that transmits only a peak wavelength (for example, 4.4 μm) of a carbon dioxide resonance radiation band, and a peak wavelength of the carbon dioxide resonance radiation band. A second light receiving element 41B having a second bandpass filter that transmits only the short wavelength side (for example, 3.5 μm), and only the longer wavelength side (for example, 5.0 μm) than the peak wavelength of the carbon dioxide resonance radiation band A flame detection unit is configured by the third light receiving element 41 </ b> C including the third band pass filter to be transmitted. Therefore, the fire detector 40 determines the fire or noise by calculating the output value of each light receiving element 41.

  The operation tester 30 of the fire detector 40 according to the first embodiment has a circuit board housing 4 (not shown) composed of a control circuit, operation switches, and the like that blink the light source 1 that emits a continuous spectrum. The test light generator 20 that generates the test light 7 by passing through the three apertures 2A, 2B, and 2C, the operation tester 30 and the fire detector 40 are always irradiated with the test light in a fixed positional relationship. And positioning portion 12 for the purpose.

  The power supply circuit of the storage unit 4 is battery driven and supplies a stable power supply to the light source 1 and the control circuit. When the control circuit receives an operation input signal of an irradiation start switch (not shown), for example, the control circuit controls blinking of the light source 1 such as a light bulb at a frequency of 1 to 10 Hz so as to be equivalent to flickering of a flame due to a fire.

  As shown in FIG. 1, the test light generation unit 20 is attached to the back surface of the distal end portion 9 where the light shielding plate 3 is fixed to the end surface 11 of the hood 8, and the optical axis of the light source 1 is orthogonal to the light shielding plate 3. As shown, the light emitting unit 13 is fitted into a hole provided in the bottom surface 10 of the hood 8. Therefore, the irradiation light of the light source 1 becomes direct light 5 or diffracted light 6 in the test light generation unit 20 and passes through the light shielding plate 3 having the three apertures 2A, 2B, 2C. It becomes the same as the spectral ratio. At this time, the areas of the three apertures 2A, 2B, 2C of the light shielding plate 3 are individually set. In addition, at least two light shielding plates 3 having the same aperture shape are provided in parallel at a predetermined interval so that the light receiving elements 41A, 41B, and 41C adjacent to each other are not affected by stray light. The straightness of the test light 7 is improved and the incidence of stray light is prevented. Furthermore, a substantially bowl-shaped reflecting surface 14 may be provided so that the diffracted light 6 reflected by the hood 8 or the bottom surface portion 10 can pass through the apertures 2A, 2B, 2C. The light shielding plate 3 may be fixed from the back surface of the distal end portion 9 and detachable.

  As shown in FIG. 1, the positioning part 12 of the fire detector 40 is inclined with respect to the distal end 9 of the operation tester 30 having a convex shape and the visual field limiting component 42 of the fire sensor 40 having a substantially conical shape. Positioning in the front-rear direction is made by contacting with a surface or the like. In addition, a guide and a guide hole (not shown) are provided in the fire detector 40 and the sensitivity tester 30 so as to be positioned in the rotational direction. Accordingly, the three apertures 2A, 2B, and 2C of the light shielding plate 3 of the operation tester 40 and the light receiving elements 41A, 41B, and 41C of the fire detector 40 are coaxial with each other. Further, since the light source 1 of the operation tester 30 and the light receiving elements 41A, 41B, and 41C of the fire detector 40 can irradiate the test light 7 at a fixed position, a stable test result can always be obtained.

The inspection work of the fire detector 40 when using the operation tester 30 of the fire detector 40 in the first embodiment will be described. First, the operator attaches the operation tester 30 to a predetermined position of the fire detector 40. Next, by turning on the irradiation start switch of the operation tester 30, the light source 1 blinks at the same frequency as the flickering of the flame. When the elapsed time from the start of irradiation until the fire detector 40 is activated is measured, the irradiation start switch is turned off, and another fire detector 4
Move 0 to the location to test.

  FIG. 2 is a partial cross-sectional view showing the positional relationship between the fire detector 40 and the operation tester 30 during a test according to the second embodiment of the present invention. The difference from the first embodiment is that the respective apertures 2A, 2B, 2C of the two light shielding plates 3 are arranged on the optical axis connecting the light source 1 and the light receiving elements 41A, 41B, 41C. Only the direct light 5 of the light source 1 becomes the test light 7. Accordingly, the test light 7 from the light source 1 can be received with the light receiving elements 41A, 41B, and 41C having high intensity, so that the power source of the light source 1 can be reduced. In order to prevent stray light from entering, an optical trap (not shown) may be provided in the hood 8.

  In the first embodiment, the light source 1 blinks at the same frequency as the flickering of the flame, and the spectral ratio due to fire can be reproduced by the area of the plurality of apertures 2A, 2B, 2C. Therefore, the multi-wavelength fire detector 40 can be operated reliably. Moreover, various fire or noise light sources can be easily created by removing the light-shielding plate 3 from the distal end portion 9 and appropriately replacing the apertures 2A, 2B, and 2C with those having different positions, areas, and quantities.

In the second embodiment, the test light 7 from the light source 1 can be received by the light receiving elements 41A, 41B, and 41C with high intensity, so that the power source of the light source 1 can be reduced.

It is a fragmentary sectional view which shows the positional relationship of the fire detector 40 and the operation test device 30 at the time of the test in the 1st Embodiment of this invention. It is a fragmentary sectional view which shows the positional relationship of the fire detector 40 and the operation tester 30 at the time of the test in the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light source 2A 1st aperture 2B 2nd aperture 2C 3rd aperture 3 Light-shielding plate 4 Storage part 5 Direct light 6 Diffracted light 7 Test light 8 Hood 9 Tip part 10 Bottom part 11 End surface 12 Inclined surface (positioning part)
DESCRIPTION OF SYMBOLS 13 Light emission part 14 Reflecting surface 20 Test light production | generation part 30 Operation | movement test device 40 Fire detector 41A 1st light receiving element 41B 2nd light receiving element 41C 3rd light receiving element 42 Field-of-view restriction member

Claims (3)

  A bottomed cylindrical hood that is in contact with a flame detector of a fire detector composed of a plurality of light receiving elements, a light source that flashes while being fixed to the bottom surface of the hood, and an optical axis of the light source in the hood And a plurality of apertures that are provided on the light shielding plate and restrict passage of direct light or diffracted light from the light source. Tester.   The fire detector operation tester according to claim 1, wherein at least two of the light shielding plates are arranged in parallel at a predetermined interval so that the plurality of apertures are coaxial. 3. The fire according to claim 1, wherein the areas of the plurality of apertures are individually set so that the test light that has passed through the plurality of apertures has the same spectral ratio of a flame due to fire and is irradiated to the fire detector. Sensor tester.

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