JPS63178392A - Flame detector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a flame detection device that is incorporated into various devices such as air cleaners and fire alarms to detect flames.

Conventional techniques One conceivable way to detect a flame using an ultraviolet sensor is to count the output from the ultraviolet sensor using a counting means, and display flame detection when the count exceeds a predetermined value within a predetermined time.

Problems to be Solved by the Invention However, with such technology, there have been malfunctions such as self-discharge of the ultraviolet sensor and display using light from a fluorescent lamp instead of a flame.

The present invention solves these problems and provides a flame detection device that can perform reliable flame detection.

As a means to solve the problem more than just a means to solve the problem, there is provided an ultraviolet sensor for detecting flame, a control means for controlling the output thereof, and each when the control means receives the output of the ultraviolet sensor. a first timer means and a second timer means that operate for a predetermined time; and the first timer means whose operation time is shorter than the second timer means, and the second timer means that the output from the ultraviolet sensor is not current during operation. The present invention provides a flame detection device having a counting means for sending an output signal to a control means when the count exceeds a predetermined value while the means is in operation, and a display means for displaying flame detection based on a detection signal from the control means.

Function: The flame detection device configured as described above is capable of accurately detecting and displaying flame without causing any malfunction due to self-discharge of the ultraviolet sensor or light from a fluorescent lamp.

Embodiment An embodiment of the present invention will be described with reference to the attached FIGS. 1 and 2.

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is a flow chart of the operation of one embodiment of the present invention.

When the ultraviolet sensor 1 detects a flame, it outputs an output signal to the control means 2. The control means 2 receives this signal and starts the first timer means 4. The counting means 3 is operated at the same time as the second timer means 6 is operated.

FIG. 3 shows an example of an output signal from the ultraviolet sensor 1.

As can be seen from FIG. 3, the output signal from the ultraviolet sensor 1 is in the form of pulses, and when a flame is generated in a location where the ultraviolet sensor 1 is sensitive, pulses are generated densely. However, on the other hand, if a flame occurs in a place where the sensitivity is not very good, not many pulses will be output as shown in Figure 4. On the other hand, malfunctions tend to occur frequently during a certain time period.

Therefore, after the first output signal is counted by the counting means 3 as described above, while the first timer means 4 is in operation, how many output signals are sent to the control means 2 until a predetermined time (human in FIG. 3) has elapsed? Control is performed so that the counting means 3 does not count even if it enters.

If there is an output signal from the ultraviolet sensor 1 again after the predetermined time (human) of the first timer means 4 has elapsed, the counting means 3 counts this, and the first timer means 4 starts operating for a predetermined time.

By repeating the above operation, the second timer means 6 is activated for a predetermined time (
During the elapse of time (lower part in Figure 3), a predetermined value (
For example, if 3) is reached, at that point the control means 2 will control the display means 6.
A detection signal is sent to and displayed. Then, the contents of the counting means 3 are cleared and the operations of the first timer means 4 and the second timer means 6 are stopped.

Further, if the second timer means 6 does not reach a certain predetermined value even after a predetermined period of time has elapsed, the counting means 3 is cleared and the operations of the first timer means 4 and the second timer means 5 are stopped. . Repeat the above actions.

Next, a detailed explanation will be given using FIGS. 3 and 4.

In FIG. 3, in the case of flame detection, the first timer means 4 and the second timer means 5 start operating with a pulse B, and the counting means 3 counts this. The first timer means 4 is operated for a predetermined time, and the second timer means 6 is operated for a predetermined time τ. Here, the output signal of the ultraviolet sensor 1 is controlled not to be counted by the counting means 3 during a predetermined operating time period of the first timer means 4. After a predetermined period of time, this is counted by the counting means 3 using the C pulse, and the operation for the next predetermined period of time is started. Here, if the predetermined value of the counting means 3 is 3, then the second timer means 6
Since it is still in operation, it is determined that a flame has been detected, and a detection signal is output to the display means 6 and displayed. On the other hand, the counting means 3 resets its contents and stops the operations of the first timer means 4 and the second timer means 6. Then, the above operation is repeated from the X pulse again.

Next, in the case of a malfunction, the first timer means 4 and the second timer means 6 start operating with the pulse shown in the lower part of FIG. As in the case of flame detection, the counting means 3 counts other pulses here, and no other pulses are counted by the counting means 3 within the predetermined operating time of the first timer means 4. The first timer means 4 starts operating again with the G pulse after a predetermined time, and the counting means 3 counts. Thereafter, since the predetermined value 3 of the counting means 3 has not been reached even after the predetermined time T of the second timer means 6 has elapsed, it is regarded as a malfunction, and the first timer means 4 and the second timer means 6 are stopped without displaying any information. , reset the contents of the counting means 3.

As mentioned above, the first timer means 4 is necessary to distinguish between flame detection and malfunction, but if only the second timer means 6 is used, for example, as shown in FIG. Since each pulse is counted, the count number of the counting means 3 reaches the predetermined value 3 of the counting means 3 for both flame detection and malfunction within a short time and is displayed, making it impossible to distinguish between malfunction and flame detection.

If we consider the case where the first timer means 4 and the second timer means 6 are used in the state shown in Fig. 4, three pulses, H pulse, E-pulse, and J pulse, are input, and flame detection indicated by J pulse occurs. On the other hand, a malfunction is caused by two pulses, the 2 pulse and the L pulse, so it is regarded as a malfunction and is not displayed.

Effects of the Invention As described above, the EIKEN device of the present invention has the following advantages: By using the second timer means and the counting means, accurate flame detection without malfunction can be performed, and when incorporated into various devices, great effects can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a 70-chart of the operation of the same embodiment, and FIG. 3 is a block diagram of an embodiment of the present invention. 1... Ultraviolet sensor, 2 Mountain... Control means, 3
...Counting means, 4...First timer means, 6...Second timer means, 6...
Display means. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] an ultraviolet sensor for detecting flame; a control means for controlling its output; and first and second timer means each operating for a predetermined time when the control means receives an output from the ultraviolet sensor.
and the first timer means having a shorter operating time than the second timer means do not count the output from the ultraviolet sensor while the second timer means is in operation and the count exceeds a predetermined value. A flame detection device comprising: a counting means for sending an output signal to a control means; and a display means for displaying flame detection based on a detection signal from the control means.