JPS633211B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flame detection device for detecting ignition and ignition in a liquid fuel vaporizing combustor.

A conventional device of this type is shown in FIG. 1 in the figure is a conductive vaporizer cylinder, and the side wall has a fuel supply port 1.
a. A cap part 1b is provided at the upper part of the interior, and a flange part 1c for placing a combustion ring 2 is provided around the opening.
3 is a conductive head placed on the vaporizer cylinder 1;
Reference numeral a designates a flame port around the head 3, 4 a flame detection rod disposed near the flame port 3a, 5 a control circuit, and 6 a flame.

Next, the operation of the conventional device will be explained. That is, the atomized liquid fuel (not shown) supplied together with air from the fuel supply port 1a into the vaporization tube 1 is heated by the vaporization tube 1, becomes a premixed mixture, and is sent to the flame opening of the head 3. 3a, it is ignited by an ignition spark from a spark plug (not shown) and burns around the flame port 3a.
When the flame F generated by this combustion comes into contact with the flame detection rod 4, a flame current flows through a circuit formed by the head 3 (flame port 3a), the vaporizing tube 1, and the flame detection rod 4. If the flame F is not generated, the flame current will not flow, and therefore, ignition or extinguishment can be detected based on the presence or absence of this flame current. The control circuit 5 outputs a control signal to determine whether to proceed to the next operation or immediately stop the operation such as supplying fuel to the carburetor 1 based on the detection of ignition or flame out. .

However, with such conventional devices, there is a risk that false detection may occur, especially when used for a long period of time. That is, when combustion is performed in the combustor, the flame F damages the head 3, especially its flame opening 3a.
The temperature in the vicinity becomes high, and as a result of long-term use, oxidation or corrosion occurs in the flame port 3a, and its electrical resistance increases, resulting in insulation between the head 3 and the vaporizer tube 1. Therefore, even if the flame ignites normally and the flame F is in contact with the flame detection rod 4, since the flame current energizing circuit is cut off between the head 3 and the vaporizing tube 1, no flame current will flow and it will be detected as an ignition. It had the disadvantage of being exposed.

This invention was made to eliminate the above-mentioned drawbacks, and an object of the present invention is to provide a flame detection device for a liquid fuel vaporization type combustor that does not cause false detection and has high reliability.

An embodiment of the present invention will be described below with reference to FIG. FIG. 2 is a sectional view showing an embodiment of a fire detection device for a liquid fuel vaporization type combustor according to the present invention.
1 to 5 and F in the figure are the same as in FIG. 6 is the head 3, here its flame port 3a and vaporizing tube 1,
Here, it is a conductor that electrically connects the cap portion 1b inside them.

That is, the present invention provides an electrical connection between the head 3 and the vaporization tube 1 to form a flame current energizing circuit.
This is done not only by direct contact with each other as in the conventional device, but also by the conductor 6. Moreover, in this case, since the conductor 6 is placed inside the head 3 and the vaporizing cylinder 1, which are less affected by heat, there is little deterioration due to heat and excellent durability is achieved.

Next, the operation of this invented device will be explained.
Since the process up to the generation of flame F due to combustion is the same as in the case of the above-mentioned conventional device, the explanation thereof will be omitted, and only the detection of ignition and fire breakage will be described. That is, when the flame F generated by combustion comes into contact with the flame detection rod 4, it passes directly from the head 3 (flame mouth part 3a) through the vaporization tube 1, or through the vaporization tube 1 via the conductor 6, and then passes through the flame detection rod 4. A flame current flows through the circuit leading to . If flame F is not generated, the above flame current will not flow,
Therefore, ignition or extinguishment can be detected based on the presence or absence of this flame current. The control circuit 5 outputs a control signal to determine whether to proceed to the next operation or immediately stop the operation such as supplying fuel to the carburetor 1, depending on the detection of ignition or combustion. .

Here, we will discuss a case where the flame port 3a of the head 3 becomes oxidized or corroded due to long-term use and its electrical resistance increases. In this case, in the conventional device, the head 3 and the vaporization tube 1 are insulated, so there is a risk of false detection. However, in the device of this invention, even in the above case, the electrical connection between the head 3 and the vaporizer cylinder 1 is maintained through the conductor 6, so the flame current energization circuit is not interrupted and the ignition occurs normally. will be detected. Moreover, in this case, the conductor 6 is connected to the head 3
and is arranged inside the vaporizer cylinder 1, and the flame F
It has excellent durability because it does not come in direct contact with the environment and is not affected by heat.

As described above, according to the present invention, the head 3
Since the conductor 6 is provided to electrically connect the flame port 3a and the vaporizing tube 1 inside thereof, there is no false detection of ignition or extinguishment, and reliability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional device, and FIG. 2 is a sectional view showing an embodiment of a flame detection device for a liquid fuel vaporized combustor according to the present invention. 1... Carburizer cylinder, 1b... Carburizer cylinder cap part, 3
...Head, 3a...Head flame opening, 4...Flame detection rod, 6...Conductor, F...Flame. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. On an electrically conductive vaporizer cylinder that heats atomized liquid fuel supplied together with air to create a premixed mixture,
In a liquid fuel vaporization type combustor in which a conductive head having a flame nozzle around the head is placed and the premixed mixture is combusted around the head flame nozzle, the head flame nozzle and the vaporization cylinder are connected to each other. In addition to providing a conductor for electrical connection inside, a flame detection rod is placed near the flame opening of the head, and when the flame detection rod comes into contact with the flame during combustion, the head flame opening, the conductor, A flame detection device for a liquid fuel vaporization type combustor, characterized in that ignition or flameout is detected based on the presence or absence of flame current flowing through a circuit formed by a vaporization tube and a flame detection rod. 2. The flame detection device for a liquid fuel vaporization type combustor according to claim 1, wherein the conductor is connected to the flame port of the head and the cap of the vaporization tube.