JPH0226133B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is used in gas or oil combustion equipment, which is equipped with a flame detection function to detect non-ignition or extinguishment, and cut off the fuel to improve safety. This article relates to combustion equipment.

Configuration of conventional example and its problems Flame detection in conventional combustion equipment consists of a burner body 6 and a burner head 5, as shown in Fig. 1.
As a result, a gas passage 7 is formed, and the gasified fuel 1
is discharged from the nozzle 4 and forms a flame 9 at the flame hole 8. A flame rod 10 is installed at a position surrounded by the flame 9, detects the ion current, transmits a flame signal to the control circuit 11, and keeps the solenoid valve 2 open. When Flame 9 disappears, the flame signal disappears,
The control circuit 11 outputs a cutoff signal and closes the solenoid valve 2. The flame detection function requires the expense of separately installing the flame rod 10, and has the disadvantage that detection sensitivity varies depending on variations in the setting of the relative position with respect to the burner.

Generally, in order to detect the ion current, a voltage of about 100 V DC is applied to the flame rod 10, so there is a risk of electric shock.

Purpose of the Invention The present invention is intended to solve such conventional problems, and to reduce costs by providing a flame detection function in the structure of the stove, and to detect flame without applying high voltage to the detection circuit. By realizing this function, we can expect to maintain performance and improve integrity.

Structure of the Invention The present invention provides a structure in which a burner mechanism and a trivet are electrically insulated in a gas or oil stove, and the tips of a plurality of arms of the trivet extend close to the flame hole of the burner. . When a flame is formed between the flame hole of the burner and the tip of the trivet, the fuel molecules are ionized by the heat and become charged molecules, forming ion groups.
When electrodes are provided at both ends of the ion group, the fuel components,
A DC voltage is generated between the electrodes, although the magnitude and polarity of the generated DC voltage vary depending on the combustion state, flame formation, electrode structure and position, etc. The voltage is detected as a flame signal and transmitted to a control circuit to keep the solenoid valve open and continue combustion. When a misfire occurs, the flame signal disappears and the control circuit outputs a cutoff signal to close the solenoid valve.

DESCRIPTION OF EMBODIMENTS Examples of the present invention will be described below with reference to FIGS. 2 to 4.

FIG. 2 shows a system configuration according to the present invention. 1
2 is a gasified fuel, 2 is a solenoid valve controlled by a signal from the control circuit 11, 3 is a fuel pipe, 4 is a nozzle, 5 is a burner head, 6 is a burner body, 7 is a gas passage of the burner, 8 is a flame hole, 9 is a flame; 11 is a control circuit that detects the voltage generated in the flame as a flame signal and controls the fuel; 12 is a burner head 5, a burner body 6, a nozzle 4, a pipe 3, and a saucer that are electrically connected to each other; 14 and stove housing 1
This is a trivet that is electrically insulated from 5 through an insulator 13.

FIG. 3 is a plan view showing the positional relationship between the burner body 6, the burner head 5, and the trivet 12, and the trivet 12 is composed of a plurality of arms. flame hole 8
The flame holes correspond to the positions of the plurality of arms of the trivet 12 inside.

FIG. 4 shows the functional block configuration of the control circuit 11, in which 16 is a flame voltage detection circuit that detects the flame signal between the burner body 6 and the trivet 12, and 17 is a solenoid valve that detects the flame signal between the burner body 6 and the trivet 12. This is a valve drive circuit that drives the.

FIG. 5 shows the functional block of the flame voltage detection circuit 16, which consists of a rectifier circuit 16a, a DC amplifier circuit 16b, and a limiting circuit 16c.

In the above configuration, the gasified fuel 1 passes through the open solenoid valve 2 and the pipe 3, and is discharged from the nozzle 4.
It passes through the gas passage 7 and is ignited at the flame hole 8, producing a flame 9.
form. The upper part of the flame 9 wraps around the tip of the trivet 12. Ionized ions corresponding to the components of the gasified fuel 1 and the combustion temperature are generated in the flame, and based on this, a voltage is generated between the burner body 6 and the trivet 12. Using this voltage as a flame signal, the control circuit 1
1 flame voltage detection circuit 16, and rectifier circuit 1.
6a rectifies the polarity of the input signal, and the DC amplifier circuit 1
6b amplifies the direct current and passes through a limiting circuit 16c that appropriately adjusts the signal level, and the signal operates the valve driving circuit 17 to maintain the solenoid valve 2 in the open state. When flame 9 disappears for some reason,
When the flame signal disappears, the solenoid valve 2 is opened and the gas fuel is cut off, thereby preventing discharge of raw gas.

The above-mentioned action is established between each of the plurality of arms of the trivet 12 and the burner body, so that it has the possibility of detecting a flame signal. For example, Gotoku 12
Even if the flame hole 9 corresponding to one arm becomes clogged, combustion can be continued using the other arm, thereby preventing malfunction.

Effects of the Invention As explained above, the present invention has the following effects.

(1) There is no need for a detection element dedicated to flame detection, and the combination of the burner body 6 and the trivet 12 has a flame detection function.

(2) Since the plurality of tips of the trivet 12 have the above-mentioned functions, the reliability of the flame detection function is improved.

(3) Flame rods require a high voltage generation circuit to apply high voltage, but the present invention uses voltage generation from ionized ions in the flame for flame detection, so a high voltage generation circuit is not required and safety is assured. is high.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a combustor showing a conventional example, Fig. 2 is a block diagram of a combustion equipment showing an embodiment of the present invention, Fig. 3 is a plan view of the same equipment, and Fig. 4 is a diagram of the same control circuit. Block Diagram FIG. 5 is a detailed block diagram of the same circuit. 1... Gasified fuel, 2... Solenoid valve, 5... Burner head, 6... Burner body, 7... Gas passage,
8...flame hole, 9...flame, 11...control circuit, 1
2... Trivet, 13... Electric insulator, 15... Stove casing, 16... Flame voltage detection circuit, 17...
Valve drive circuit.

Claims (1)

[Claims] 1. A burner, a trivet disposed around the burner so that the rising part of the flame of the burner comes into contact with a plurality of tips thereof, insulating means for electrically insulating the burner and the trivet, and the burner and a control circuit that controls combustion by detecting a voltage generated by ionized ions of a flame between the trivet and the trivet.