JPS6127420A - Incomplete combustion alarming device - Google Patents

Abstract

PURPOSE:To contrive to alarm the incomplete burning before the incomplete burning condition exceeds the designated level due to the oxygen deficiency and other main cause by a method wherein an alarm is generated when the pulsation signal of a flame detecting element exceeds the designated range and the designated time. CONSTITUTION:A flame detecting element 9 detects the burning condition of a burner 3. A region T3-T4 indicates the detecting signal variation in which the burning condition is changed to an incomplete burning. At the detection of the pulsation exceeds the designated value Vr after the enlargement of the pulsation of the signal value, an alarm is generated. When the alarm is generated at the continuance of the designated time after the piriod exceeding the designated value Vr, the change to the unsteady burning condition can be notified certainly, accordingly, the misoperation can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for detecting the flame condition of a burner of a combustion appliance and warning of an incomplete combustion condition.

Hereinafter, a conventional example and the present invention will be explained in detail using a gas fan heater as an example of a combustion device.

Conventional configuration and its problems 21,-.

Figure 1 shows the configuration of the gas fan heater. 1 is the case,
2 is a gas control valve, 3 is a burner, 4 is a heat exchanger, 5 is a fan motor, 6 is a fan, 7 is a combustion-secondary air suction port, 8 is a heat exchange air and combustion secondary air suction port, 9 is a A flame detection element, 10 indicates a control section. The air suction ports 7 and 8 are equipped with filters to prevent large particles from being sucked in. The combustion state of the burner 3 is detected by the flame detection element 9, and the signal thereof is processed by the control section 10. The control section controls the amount of gas using the control valve 7, and also controls the amount of air for combustion and the amount of air for blowing using the fan motor 5.

Figure 2 shows tin oxide (S n O2) as a flame detection element.
) is the element characteristic after the start of combustion. (5)
The horizontal axis represents the elapsed time, and the vertical axis represents the resistance value of tin oxide. R1 is the first detection level, and R2 is the second detection level. Conventionally, if it does not fall below R1 within a predetermined time after combustion starts, it is considered a sensor disconnection, and if it falls below R2 during combustion, it is considered incomplete. It was determined to be combustion. In the diagram (5), the period from T1 to T43 is the normal combustion region, and the sensor resistance is stable after T2, when a predetermined time has elapsed from the start of combustion.
The area between 13 and 14 is a region where incomplete combustion is progressing.

FIG. 2(B) shows the change in partial pressure when a resistor is connected in series with the tin oxide and a DC voltage is applied. V
l and v2 respectively indicate the partial pressure values corresponding to R1 and R2 in (3), and in conventional 1, it is determined that there is an oxygen deficiency at point 14 when the pressure becomes 2 or more, and combustion is stopped or the oxygen deficiency is displayed. was doing.

Further, in another conventional example 2, after the start of combustion, time is accumulated and a ventilation warning is issued when a predetermined time has elapsed to prevent incomplete combustion.

However, in Conventional Example 1, the predetermined control is performed or displayed when the oxygen deficiency level is reached without any prior warning to the user. There was an inconvenience.

In addition, in Conventional Example 2, since only the time integral after the start of combustion is used, the warning level may differ depending on the size of the room used, and incomplete combustion may occur due to clogging of the filter at the combustion air intake port. The problem was that it would continue to burn even if it was in use.

OBJECTS OF THE INVENTION The present invention solves the conventional problems and aims to provide a warning device that issues a warning before incomplete combustion occurs to a predetermined level or more due to oxygen deficiency or other factors.

Structure of the Invention In order to achieve this object, the present invention is provided with a control section that determines that the signal from the flame detection element has exceeded a predetermined range after it starts pulsating, and issues a warning. .

With this configuration, the signal from the flame detection element such as tin oxide can be used to determine the instability of the combustion flame, that is, the phenomenon of pulsation as it approaches incomplete combustion, and to detect it before abnormal combustion occurs due to lack of oxygen, etc. It has the effect of alerting people.

Description of Embodiments Below, embodiments of the present invention will be described using a gas fan heater as an example.

FIG. 1 is a diagram showing the configuration of the fan heater as described above. A flame detection element 9 detects the combustion state of burner a. The appearance of the signal detected by 9 is the second
As shown in the figure.

The region T3 to T4 shown by (B) in FIG. 2 represents a change in the detection signal in a state where the combustion is transitioning to incomplete combustion. Here, the pulsation of the signal value becomes large, and there are times when it exceeds the predetermined value vr. This predetermined value V,
A warning is issued when a pulsation exceeding the threshold is detected. The warning may be a sound such as a buzzer or something visually appealing such as a lamp, but users of combustion appliances can detect the above condition before it reaches incomplete combustion, and ventilate or It has effects such as being able to check filters. In this figure, the predetermined value vr is displayed at only one location, but vr may be varied depending on the absolute value of the partial pressure.

Furthermore, if a warning is issued when the above-mentioned predetermined value V is exceeded for a predetermined six or two consecutive hours, it is possible to reliably detect that the combustion state is transitioning to an unstable combustion state, and prevent malfunctions. connected to.

Furthermore, when a full-order burner is employed in a combustion appliance, air shortage due to filter clogging or the like will sensitively affect unstable combustion, and the pulsation phenomenon of the flame detection signal will become noticeable. Therefore, it is easy to detect the pulsation of the signal and issue a warning.

FIG. 3 shows an embodiment of the control section of the present invention. 9 is a flame detection element made of tin oxide or the like, and 11 is a resistor connected in series with the element 9. Further, the resistor 12 may be connected in parallel with the resistor 11 or not act depending on the operation of the switching element 13. The divided voltage potential between the resistor and the element is inputted into the control section 15 as a predetermined value by the 14 analog-to-digital converters, and the judgment as shown in the detailed explanation of the present invention is made. I am giving a warning. 16 is a resistor for limiting the current to the indicator 17.

The action of the above-mentioned resistors 11 and 12 is that when the resistor 12 does not act, the disconnection of the element is detected by the voltage division between the resistor 11, the element 9, and the 7-behind voltage, and the resistor 12 is connected in parallel with the resistor 11. When this occurs, a signal is detected after reaching a predetermined combustion state, that is, an incomplete combustion state is detected. This is because, for example, tin oxide, etc.
Before the start of combustion, it is on the order of tens to hundreds of megohms,
Further, when incomplete combustion is detected, the range of resistance change is large, ranging from several hundreds to several tens of ohms.

As described above, according to the incomplete combustion warning device of the present invention,
The following effects can be obtained.

(1) Rather than knowing the state after it has reached complete incomplete combustion, it is possible to know the state in which it is transitioning, so it is possible to ventilate the room or remove a blockage from a part of the filter as soon as possible.

(2) Regardless of the size of the room, the transition to an incomplete combustion state can be detected, providing convenience for users.

(3) It can be applied to combustion equipment regardless of whether it is installed indoors or outdoors, and when a completely abnormal combustion state is reached, the safety of the equipment is ensured by combining it with the conventional combustion shutdown function. Ru.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of the gas fan heater, Fig. 2 is a characteristic diagram showing the elapsed time after the start of combustion, changes in element resistance (5), and changes in partial voltage potential (B), and Fig. 3 is a characteristic diagram showing the elapsed time after the start of combustion, and changes in partial voltage potential (B). FIG. 1 is a block diagram of an incomplete combustion warning device including a control section showing one embodiment. 3... Burner, 9... Flame detection element, 15
-Control unit, vr...predetermined range.

Claims (3)

[Claims] (1) An incomplete control unit consisting of a flame detection element that detects the flame state of the combustion burner, and a control unit that inputs the signal of the flame detection element and issues a warning when the pulsation of the signal becomes larger than a predetermined range. Combustion warning device. (2) The incomplete combustion warning device according to claim 1, which issues a warning when the pulsation signal of the flame detection element becomes larger than the predetermined range for a predetermined period of time. (3) The incomplete combustion warning device according to claim 2, which is applied to an all-primary combustion type burner.