JP2001264160A - Direction indicator for flame detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a direction indicator by which the direction of a flame detector can be adjusted. SOLUTION: A tube body which is erected and installed in a direction perpendicular to the front at a time when a body is fitted to the front of the flame detector and in the position of the light receiving part of the flame detector is installed at the body. A laser pointer is arranged inside the tube body. A direction to which the flame detector is directed is grasped by a laser beam from the laser pointer. Thereby, the front can by grasped surely event when a monitoring distance is long, and a monitoring range can be confirmed while the front is used as the center.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direction indicator for a flame detector.

[0002]

2. Description of the Related Art Conventionally, a flame detector for detecting infrared light or ultraviolet light emitted from a flame has been used. In recent years, a highly sensitive flame detector has been used as an infrared three-wavelength flame detector. I have. The principle of operation of this flame detector will be described. The flame emits infrared rays (CO2 resonance radiation) emitted from carbon dioxide gas.
Is contained, and has a peak at a wavelength of 4.4 μm, and is radiated while fluctuating. In the infrared three-wavelength method, for example, a wavelength of 4.0 μm, 4.
An infrared sensor for detecting three regions of 4 μm and 5.0 μm is mounted. The signal amplifier of the detector has an electric band-pass filter, and selects and amplifies a fluctuation component of 1 to 10 Hz in the above wavelength band. These three sensor outputs are used in the above-described determination of the resonance radiation by an algorithm for calculating the correlation and the ratio of each, and an alarm is issued in the case of a fire based on the result. Therefore, it has higher selectivity than the method using a simple infrared sensor and can be installed outdoors with natural light, and even in indoors, reliable fire detection that does not respond to certification of fluorescent lamps, sodium lamps, mercury lamps, etc. Is possible.

[0003]

Conventionally, when confirming the directivity of a flame detector, it has conventionally been confirmed visually from the floor (for example, Japanese Utility Model Laid-Open No. 5-71995 and Japanese Utility Model Laid-Open No. 7-1995).
No. 3089). However, in the flame detector having high sensitivity as described above, since a wide range of flames can be detected, the distance from the floor surface to the detector installation position is long, and it is difficult to confirm the direction by the conventional method.

[0004] Further, when the accuracy of the flame detection by the flame detector increases, there is a demand that the flame detector be linked to a fire extinguishing activity based on the detection signal. The greater the distance from the surface, the greater the deviation of the monitoring range due to the deviation of the mounting angle, so the accuracy requirement for the orientation is greater.

It is an object of the present invention to be able to adjust the direction of a flame detector.

[0006]

According to the present invention, there is provided a cylindrical body which is provided upright at a light receiving portion of a flame detector in a direction perpendicular to the front when the main body is fitted to the front of the flame detector. A laser pointer is provided in the main body, and the direction in which the flame detector is facing is grasped by a laser beam from the laser pointer provided in the cylinder.

Further, the cylinder has a fine adjustment mechanism for correcting the direction of the laser pointer, and the main body is fixed to the front of the flame detector by tightening a band or a bolt.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. FIGS. 1 and 2 are a front view and a right side view showing the inside with a broken line in a state where a direction indicator using the present invention is mounted on a flame detector.

A main body 2 of the direction indicator is put on the flame detector 1, and a cylindrical body 3 is provided upright at the center of the main body 2. A laser pointer 4 is arranged in the cylinder 3. First, the body 2 of the direction indicator is formed by bending a metal plate such as aluminum so that the inner peripheral surface matches the outer periphery of the flame detector 1, and is fixed to the flame detector 1 by fixing bolts 5 at four corners. Have been. Further, on the outer peripheral surface of the main body 2, a long hole 6 is provided on a surface opposed thereto, and in a state where the flame detector 1 is installed, for example, in a situation where the flame detector 1 is on a pedestal and the back side can be used, these long holes 6 are provided. You may fix it by attaching a band to 6 and fastening. In any of the fixing methods, the flat portion of the main body 2 must be securely in contact with the front of the flame detector 1, and if it is slightly deviated, the direction indicator cannot accurately indicate the direction.

A laser pointer 4 is supported by a plurality of screws 7 at the center of a cylindrical body 3 erected from the main body 2. These screws 7 are pressed from three directions at 120 ° intervals facing the front at two places in the longitudinal direction of the laser pointer 4 and maintained in that direction. Specifically, by pushing and pulling the six screws 7, the holding position of the laser pointer 4 in the cylinder 3 can be adjusted. By adjusting the two positions, the space in the cylinder 3 can be adjusted. Can be used to adjust the direction of the laser pointer 4. The direction of the laser pointer 4 is naturally adjusted so as to emit light in a direction perpendicular to the plane portion of the main body 2 before the laser pointer 4 is mounted on the flame detector 1. Of course, the direction cannot be specified. The laser pointer 4 also does not emit laser light linearly in its length direction, and usually has a slight deviation.
By correcting such individual differences, it is possible to indicate the accurate direction of the flame detector 1.

A switch rod 8 extending outside the cylinder 3 for turning on and off the laser pointer 4 is provided.

As described above, the direction of the flame detector 1 is accurately confirmed. The monitoring range of the flame detector 1 is shown in a three-dimensional projection view in FIG. Basically, it spreads conically at a predetermined angle from the mounting position of the flame detector 1,
Is approximately cylindrical at a position of about 30 m to about 50 m when the position is maximized, and then abruptly converges, and a position of about 60 m is the farthest part. This monitoring range is the result of a detection experiment on a fire source using n-heptane as a combustion material in a 0.1-square-meter fire tray.

FIG. 4 shows a monitoring range when the flame detector 1 is installed on a ceiling. In the figure, the vertical axis represents the distance with the flame detector 1 as the origin, and the vertical direction is directed straight downward without inclination (0 °) from the ceiling surface, and the ceiling height is 16 m, 30 m,
The monitoring range on the floor at 43 m is shown. With a ceiling height of 30 m to 43 m and a circle with a radius of about 30 m, which is almost the same center around the front of the flame detector 1, it is possible to set the monitoring range to be approximately the same. When designing the monitoring system, the installation position of the flame detector 1 is determined. Since a circular area only needs to be arranged at the center, the area can be easily arranged, and the on-site confirmation can be realized by accurately determining the front of the installed flame detector 1 so that the monitoring area at the time of design can be realized.

FIG. 5 shows a monitoring range in the case of installation on a wall surface. 4, the horizontal axis of the vertical axis represents the distance, the horizontal axis is the direction of the wall surface, and the vertical axis is the front direction of the flame detector 1, centering on the installation position of the flame detector 1. And flame detector 1
Is an angle raised by 60 ° from immediately below, and indicates the monitoring range of the floor surface for each of the installation heights of 8 m, 21 m, and 27 m. In the case of this wall installation,
Although it cannot be said that it is circular around the flame detector 1, the angle is 60 °.
As a result, a substantially circular monitoring range can be obtained in a height range from 8 m to 27 m. By checking the direction of the flame detector 1, a monitoring range similar to the ceiling installation can be set.

FIG. 6 shows a front view of the flame detector 1, in which a light receiving window 9 is disposed at the center and a detecting element is provided therein, and the laser pointer 4 is located in front of the light receiving window 9. Will be placed. By using this laser pointer 4, even if it is more than 50 m away from the flame detector 1, the front position can be confirmed by the straightness of the laser light, and compared with the conventional method of confirming the range of light. It is easy to determine, and it is faster to check the center point and set a circular monitoring range than to determine the periphery of the monitoring range.

As described above, according to the present invention, when the main body is fitted to the front of the flame detector, the cylindrical body which is erected perpendicularly to the front and at the position of the light receiving portion of the flame detector is provided. The laser pointer is arranged in the cylinder and the direction of the flame detector is grasped by the laser light from the laser pointer, so that the front can be grasped reliably even if the monitoring distance is long. The monitoring range can be checked mainly.

Furthermore, the cylinder is provided with a fine adjustment mechanism for correcting the direction of the laser pointer so that errors due to individual laser pointers can be corrected, and the main body is tightened with a band or bolt with respect to the front of the flame detector. Thereby, it can be easily attached and the operation is simplified.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a projection view showing a monitoring range of FIG. 1;

FIG. 4 is a plan view showing a monitoring range in ceiling installation based on FIG. 3;

FIG. 5 is a plan view showing a monitoring range in wall installation based on FIG. 3;

FIG. 6 is a front view of the flame detector used in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flame detector 2 Main body 3 Tube 4 Laser pointer

Claims (4)

[Claims] When the main body is fitted to the front of the flame detector, a cylinder is provided on the main body in a direction perpendicular to the front and at a position of a light receiving portion of the flame detector. A direction indicator for a flame detector, wherein a laser pointer is disposed in a cylinder, and a direction of the flame detector is grasped by a laser beam from the laser pointer. 2. The direction indicator of a flame detector according to claim 1, wherein the cylinder has a fine adjustment mechanism for correcting the direction of the laser pointer. 3. The direction indicator for a flame detector according to claim 1, wherein the main body is fixed by a band to the front of the flame detector. 4. The direction indicator for a flame detector according to claim 1, wherein the main body is fixed to the front of the flame detector by bolting.