JPH06111158A - Frame sensor - Google Patents

Abstract

PURPOSE:To expand a detecting area and to detect flames over a wide range by arranging plural detecting tubes so that the directions of detecting areas of plural detecting tubes are different from each other. CONSTITUTION:Two detecting tubes 2 for detecting ultraviolet rays or infrared rays radiated from flames are arranged on the outer surface of a housing 1a. The tubes 2 are electrically connected to a processing circuit base built in the housing 1a. The detecting area of one detecting tube 2 is approximately conical and has about 110 deg. angle of visual field. The two tubes 2 are arranged so that the detecting area of one tube 2 is overlapped on that of the other tube 2 by 20 deg. angle of visual field. The pointing direction of respective tubes 2 are set to be 90 deg. apart from each other. Thereby >=180 deg. angle of visual field can be continuously secured as the detecting area of a flame sensor 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame detector for detecting ultraviolet rays emitted from a flame and issuing a fire alarm according to the detection level.

[0002]

2. Description of the Related Art FIG. 6 is a side sectional view showing a conventional example of a flame detector. As shown in FIG. 6, the flame detector 1 includes a detection tube 2 that detects weak ultraviolet rays or infrared rays emitted from a flame, and a processing circuit board 4 that outputs a fire signal according to the detection level of the detection tube 2. And are built in the housing 1a. The detection tube 2 is exposed through a detection hole provided in the housing 1a, and the flame is detected through the detection hole. As shown in FIGS. 6 and 9, the detection region 10 of the detection tube 2 has a substantially conical shape,
The viewing angle is 0 °. Therefore, the range of the conical detection area 10 can be monitored by one flame detector 1.

7 and 8 are views showing a state in which the flame detector 1 having the above-mentioned structure is installed. When the flame detector 1 having the above structure is used to monitor a monitoring place 20 such as a tunnel or a corridor which is very long only in a specific direction as shown in FIGS. 7 and 8, conventionally, for example, as shown in FIG. , A plurality of the flame detectors 1 are installed obliquely with respect to the ceiling surface 20a of the monitoring place 20 so as to obtain a long detection area in the specific direction, or, as shown in FIG. The flame detector 1 is horizontally installed on the ceiling surface 20a with an appropriate interval. In the case of installation as shown in FIG. 7, assuming that the maximum detectable distance of the flame detector 1 with respect to the specific direction is L, the plurality of flame detectors 1 may be installed at intervals of the maximum detectable distance L. If the plurality of flame detectors 1 are installed at intervals slightly shorter than the maximum detectable distance L, the detection areas overlap each other and the non-detection area can be reduced. In addition, 20b is a floor surface.

[0004]

By the way, in the conventional flame detector 1, it is very troublesome and difficult to install the flame detector 1 obliquely on the ceiling surface 20a as shown in FIG. 7, and only in a certain specific direction. When monitoring a monitoring place 20 such as a very long tunnel or corridor, a large number of flame detectors 1 are required as shown in FIGS. 7 and 8, which causes a cost problem.

The present invention has been made in view of the above problems, and an object of the present invention is to have a wider flame detection region than that of the prior art, and to be able to detect a flame over a wide region. To provide a flame detector.

[0006]

In order to solve the above problems, the present invention is a flame detector comprising a plurality of detection tubes for detecting flames, wherein the detection areas of the plurality of detection tubes are in different directions. As described above, the plurality of detection tubes are arranged.

[0007]

In the present invention, since the plurality of detection tubes are arranged so that the directions of the detection areas of the plurality of detection tubes are different, the detection area is extremely wide, and the flame can be detected over an extremely wide area. .

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing an embodiment thereof. The same components as those in the conventional example are designated by the same reference numerals.

FIG. 1 is a front view showing a flame detector according to an embodiment of the present invention. However, in FIG. 1, a front side of the detection tube protection plate 3 to be described later is not shown.

In the flame detector 1 of the embodiment of the present invention, as shown in FIG. 1, two detection tubes 2 and 2 for detecting weak ultraviolet rays or infrared rays emitted from the flame are provided on the outer surface of the housing 1a. Has been. The two detection tubes 2 and 2 are electrically connected to a processing circuit board (not shown) built in the housing 1a as in the conventional case, and the processing circuit board is the two detection tubes 2 A fire signal is output according to the detection level of each of the two. Incidentally, in the present invention, two or more detection tubes 2 may be provided.

FIG. 4 is a view showing the structure of the detection tube 2, and the detection area of one detection tube 2 is substantially conical and has a viewing angle of about 110 ° as in the conventional case. The detection tube 2 usually has a cathode electrode 2a and an anode electrode 2b enclosed in a glass tube, and the direction of the detection region of the detection tube 2 is directed to the surface of the cathode electrode 2a as shown in FIG. Vertical direction.

As shown in FIG. 1, each of the two detection tubes 2 and 2 of the flame detector 1 has a detection direction of a detection area of one detection tube 2 and a detection area of the other detection tube 2. They are arranged on the outer surface of the housing 1a so that their directivity directions are different from each other. As shown in FIG. 1, the two detection tubes 2,
2 is the detection area of one of the detection tubes 2 and the other detection tube 2
Of the two detection tubes 2 and 2 are arranged so as to be 90 ° apart from each other. Therefore, as the detection area of the flame sensor 1, a viewing angle of 180 ° or more is secured without interruption.

FIG. 2 is a side view showing the flame detector according to the embodiment of the present invention, as viewed in the direction of arrow A in FIG. Further, FIG. 3 is a plan view showing the flame detector, and is a view seen in the direction of arrow B in FIG.

As shown in FIG. 3, the flame detector 1 is provided with the two detection tubes 2 and 2 arranged side by side. Moreover, FIG.
As shown in FIG. 3, detection tube protection plates 3 and 3 for protecting the two detection tubes 2 and 2 are provided on the front end surface and the end surface of the two detection tubes 2 and 2, respectively. It is projected integrally with.

FIG. 5 is a view showing a state in which the flame detector 1 of the embodiment of the present invention having the above-mentioned structure is installed. When the flame detector 1 of the embodiment of the present invention having the above-mentioned configuration is used to monitor a monitoring place 20 such as a tunnel or a corridor that is very long only in a specific direction, a plurality of flame detectors 1 may be appropriately used as in the conventional case. If it is installed horizontally on the ceiling surface 20a of the monitoring place 20 at intervals of, most places can be monitored. However, as shown in FIG. 5, the flame detector 1 of the present embodiment has the detection region on both sides of the flame detector 1 as a center, and the detection region 10 of the flame detector 1 of the embodiment of the present invention is the same as the conventional one. Detection area 10 of example flame detector 1
It is about twice as large as Therefore, by using the flame detector 1 according to the embodiment of the present invention, the number of the flame detectors 1 installed can be reduced by half as compared with the conventional case.

By the way, the plurality of flame detectors 1 may be installed at an interval 2L which is twice the maximum detectable distance L. However, as shown in FIG. 5, the plurality of flame detectors 1 are arranged at the intervals. If the two flame detectors 1 and 1 are arranged at intervals slightly shorter than 2L, the detection areas of the two flame detectors 1 and 1 overlap each other, and the non-detection area can be reduced.

[0017]

According to the present invention configured as described above, the flame detection area is much wider than the conventional one, and the flame can be detected over a wide area. Therefore, it is possible to reduce the number of flame detectors installed in the monitoring place compared to the conventional one,
Installation work is also very easy.

[Brief description of drawings]

FIG. 1 is a front view showing a flame detector 1 according to an embodiment of the present invention.

FIG. 2 is a side view showing the flame detector 1 according to the embodiment of the present invention.

FIG. 3 is a plan view showing a flame detector 1 according to an embodiment of the present invention.

FIG. 4 is a view showing a detection tube 2.

FIG. 5 is a view showing a state in which the flame detector 1 according to the embodiment of the present invention is installed.

FIG. 6 is a side sectional view showing a conventional flame detector 1.

FIG. 7 is a diagram showing an example of a state in which a conventional flame detector 1 is installed.

FIG. 8 is a diagram showing an example of a state in which a conventional flame detector 1 is installed.

FIG. 9 is a diagram showing a detection region 10 of a conventional flame detector 1.

[Explanation of symbols]

 1 Flame Detector 1a Housing 2 Detection Tube 3 Detection Tube Protection Plate 10 Detection Area

Claims (1)

[Claims] 1. A flame detector comprising a plurality of detection tubes for detecting a flame, wherein the plurality of detection tubes are arranged so that directions of detection areas of the plurality of detection tubes are different from each other. A flame detector that does.