JPH0715328B2 - Safety control device for combustion equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a safety control device for a combustion device for safely controlling a boiler, a furnace, and other general combustion devices.

[Conventional technology]

In a conventional combustion device configured to ignite the main burner through a predetermined combustion sequence such as pre-purge, pre-ignition, etc., detection of occurrence of pseudo flame during pre-purge or pre-ignition period At about the same time, lockout or heating of the bimetal heater is performed to immediately issue an alarm buzzer or the like.

[Problems to be Solved by the Invention]

Since the conventional combustion device is locked out or an alarm is issued only when a pseudo flame is generated in a very short time during the pre-purge or pre-ignition period as described above,
Each time, lockout or alarm reset must be performed manually and then restart, which is very inconvenient.

The present invention has been made in view of the above circumstances, and an object of the present invention is to obtain a safety control device for a combustion device that is easy to use by performing a predetermined process according to the duration of the pseudo flame.

[Means for Solving the Problems]

The safety control device of the combustion device according to the present invention, if the continuous time or the addition time of the pseudo flame signal detecting the pseudo flame is shorter than the predetermined reference time, perform the prepurge again or continue the prepurge or the preignition as it is. It was done by doing so.

[Action]

The safety control device for a combustion device according to the present invention does not lock out or generate an alarm when a pseudo flame is generated for a short time, and returns to prepurge again or the prepurge or preignition currently being performed remains unchanged. Continued.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a combustion device, 2 is a flame sensor as a means for detecting a pseudo flame provided in the combustion device 1, 3 is an operation control of the combustion device 1 in a predetermined combustion sequence, and other predetermined controls. Sequence controller for performing 4
Is a pre-purge timer operated during the pre-purge period according to the instruction of the sequence controller 3, 5 is a pre-ignition timer operated during the pre-ignition period according to the instruction of the sequence controller 3, and 6 is a pseudo flame deciding device during the pre-purge or pre-ignition period. In, the time detection means for detecting the addition time obtained by adding the time during which the pseudo flame signal detected by the flame sensor 2 continues or the time during which the pseudo flame signal is obtained is compared with the time detected by this time detection means. And comparison means.

Reference numeral 7 denotes a display device for performing a predetermined display such as an alarm display when the display is controlled by the sequence controller 3.
Is a setting device for setting the control mode, and when the time detected by the time detection means is shorter than the predetermined reference time, returns to pre-purge and restarts, or pre-purge or pre-ignition continues to operate as it is. Is set in advance.

Next, the operation will be described with reference to the flowchart of FIG.

First, in step ST1, the setter 8 is used to set the control mode of the apparatus to the restart mode or the operation continuation mode. Next, in step ST2, it is checked whether or not pre-purge or pre-ignition is currently performed in the combustion apparatus 1. If prepurge or preignition is not performed, the following sequence is executed. If pre-purge or pre-ignition is performed, the process proceeds to step ST3, and it is checked whether or not a pseudo flame signal is detected from the flame sensor 2 during the operation period of the pre-purge timer 4 or pre-ignition timer 5. If no pseudo flame signal is detected, step ST2
If it is detected, the process proceeds to step ST4.

In this step ST4, the time detection means of the pseudo flame determination device 6 detects the time period during which the pseudo flame signal continues or the addition time obtained by adding the time period during which the pseudo flame signal is obtained. Further, the comparison means compares the time detected by the time detection means (hereinafter referred to as the duration time) with a predetermined reference time (for example, 5 seconds). Then, when the continuation time is shorter than the reference time, the process returns to step ST2. In this step ST2, if the control mode set by the setter 8 is the restart mode, the process returns to the pre-purge and restarts from the pre-purge. Further, when the set control mode is the operation continuation mode, the pre-purge or pre-ignition currently being performed is continuously performed as it is.

If it is determined in step ST4 that the duration exceeds the reference time, the additional time is transferred to the memory in step ST5 if necessary, and then the process proceeds to step ST6 to perform a predetermined lockout. While performing the process, an alarm is displayed on the display device 7, and the full load is stopped.

When restarting after this, it is possible to restart by resetting the lockout and alarm after confirming that there is no other abnormality.

According to the above, if a pseudo flame is generated during pre-purge or pre-ignition, and disappears within 5 seconds, for example, it returns to the pre-purge and restarts, or the current pre-purge or pre-ignition remains unchanged. It will continue. Also, if the pseudo flame continues for more than 5 seconds, the prescribed measures such as lockout and alarm are immediately taken.

〔The invention's effect〕

As described above, according to the present invention, when the pseudo flame disappears within a certain period of time, the system automatically returns to the pre-purge and is restarted, or the pre-purge or the pre-ignition is continued as it is. Thus, even if a pseudo flame occurs in a short time, lockout or alarm will not occur, so it is possible to save the trouble of resetting the lockout, alarm, etc. and then restarting, and improving usability. There is an effect that can be done.

[Brief description of drawings]

FIG. 1 is a block diagram showing a safety control device for a combustion device according to an embodiment of the present invention, and FIG. 2 is a flow chart showing the operation of the device. 1 is a combustion device, 2 is a flame sensor, 3 is a sequence controller, 4 is a pre-purge timer, 5 is a pre-ignition timer, and 6 is a pseudo flame judging device.

Claims (1)

[Claims] 1. A detection means for detecting a pseudo flame generated during a pre-purge or pre-ignition period, and a time during which the pseudo flame signal detected by the detection means continues or a time when the pseudo flame signal is obtained is added. A time detection means for detecting time, a comparison means for comparing the time detected by the time detection means with a predetermined reference time, and a comparison result in which the detected time is shorter than the reference time by the comparison means are obtained. And a sequence controller for controlling the combustion device so that the prepurge is performed again or the prepurge or preignition is continuously performed.