JPH0623603B2 - Liquid fuel combustion device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a liquid fuel combustion apparatus that burns liquid fuel.

[Prior Art] A liquid fuel combustion apparatus of this type is shown in FIG. FIG. 1 is a partial cross-sectional view showing the outline of the configuration of this type of liquid fuel combustion device, in which (1) is a vaporization pipe and (2) is
Is a jet nozzle, (3) is a thermistor, (4) is a needle,
(5) is an electromagnetic solenoid, (6) is a fuel pipe, (7) is a pump,
(8) is a burner, (9) is a spark plug, and (10) is a flame detection rod.

The vaporization pipe (1) is made of a heat-resistant stainless steel or the like, and a vaporization stabilizing member (1b) made of metal mesh or the like is placed inside the outer cylinder (1a) made of a metal mesh to enhance heating efficiency. , A vaporization chamber is constructed, and both ends are sheathed heaters (1c)
Are welded to. Also, at one end of the vaporization pipe (1), a jet nozzle
(2) is installed and the thermistor (3) installed here constantly detects the temperature of the vaporization tube (1). The needle (4) is a member that opens and closes the ejection nozzle (2) and is controlled by an electromagnetic solenoid (5). A fuel pipe (6) is connected to the discharge side of the pump (7), and this fuel pipe (6) is joined to one end of the vaporization pipe (1) on the side opposite to the jet nozzle (2). There is. A burner (8) is installed opposite to the jet nozzle (2), and the jet nozzle (2) is installed at the time of combustion.
The vaporized gas ejected from the air flows in to form a mixture with air. Ignition is performed by sparks generated by the spark plug (9), and the combustion state is electrically detected by the flame detection rod (10) to check the combustion safety.

Next, the operation of the conventional liquid fuel combustion device will be described. To perform combustion, first turn on the sheath heater (1c), heat the sheath heater (1c), and gradually heat the vaporization pipe (1) by the heat generated by the sheath heater (1c) to a predetermined temperature. To raise. When the vaporization tube (1) heats up, the thermistor (3) detects this and drives the pump (7) to transfer the liquid fuel through the fuel tube (6) to the vaporization chamber, that is, the outer cylinder (1) and the sheath. Feed it between the heater (1c).

The liquid fuel sent inside the vaporization pipe (1) is
By contacting the inner wall surface of a), the outer wall surface of the sheath heater (1c) and the vaporization stabilizing member (1b), they are vaporized and become vaporized gas. The electromagnetic solenoid (5) is then energized and the needle
When (4) is attracted in the direction of the electromagnetic solenoid (5), the hole at the tip opening of the ejection nozzle (2) that was closed by this needle (4) (hereinafter referred to as the nozzle hole) opens. , Vaporized gas is ejected into the burner (8). At this time, the vaporized gas ejected from the ejection nozzle (2) is supplied to the burner (8) as an air-fuel mixture by sucking air by the ejector effect. And
When a spark is generated in the spark plug (9), the air-fuel mixture supplied inside the burner (8) ignites and becomes a flame. This flame is monitored by the flame detection rod (10) during combustion, and abnormal combustion, extinction, etc. are monitored.

Next, in order to stop the combustion, stop the operation of the pump (7), stop the supply of liquid fuel, and then de-energize the electromagnetic solenoid (5) to remove the needle (4) from the original position. It is completed by returning to the position and closing the nozzle hole at its tip.

Next, the operation of the needle (4) in the conventional device will be described with reference to FIG. Fig. 4 shows the needle (4) in the conventional device
FIG. 5 is a diagram showing voltage control applied to the electromagnetic solenoid (5) for controlling the operation of FIG. 4. In FIG. 4, the voltage is 0 V until ignition and the needle (4) closes the nozzle hole.
At ignition, a voltage of 100V is applied and the solenoid
(5) is maximally excited and sucks the needle (4). During combustion, a voltage of 24 V is applied to hold the needle (4) at the suction position. When the next fire is extinguished, the voltage is set to 0 V so that the needle (4) closes the nozzle hole.

By moving the needle (4) in the ejection nozzle (2) in parallel in this way, the opening and closing of the nozzle hole and the heavy components in the fuel gas vaporized into the nozzle hole (hereinafter referred to as tar)
Is cleaning up any sticking.

[Problems to be Solved by the Invention] Since the conventional liquid fuel combustion apparatus as described above operates as described above, the tar that adheres to the nozzle holes is cleaned by moving the needle during ignition and extinguishing the fire. However, when using liquid fuel with a large amount of heavy substances, a large amount of tar is generated and the tar cannot be removed smoothly, and the tar eventually adheres to the nozzle hole It is often impossible to use it properly. As a countermeasure in this case, there is a method in which the ejection nozzle is air-baked for cleaning, but the operation is complicated, and in the case of the ejection nozzle made of aluminum or the like, it should be air-baked at a high temperature. However, there is a problem that the effect is not improved because it cannot be performed.

The present invention has been made to solve the above problems, and an object thereof is to obtain a liquid fuel combustion apparatus in which tar is unlikely to adhere to the ejection nozzle.

[Means for Solving Problems] In the liquid fuel combustion apparatus according to the present invention, tar adheres to the ejection nozzle and the nozzle hole is clogged, the combustion efficiency deteriorates, and the size of the flame during combustion increases. When is smaller, the flame detecting rod detects this and automatically operates the needle to clean the nozzle hole.

[Operation] In the present invention, when the tar adheres to the ejection nozzle and the nozzle hole is clogged, the combustion efficiency deteriorates and the size of the flame during combustion becomes small, the flame detection rod detects it. Since it is decided to automatically operate the needle to clean the nozzle hole, the jet nozzle can be automatically cleaned at times other than ignition and extinction.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. The configuration of the liquid fuel combustion apparatus according to the present invention is the same as that of the conventional apparatus shown in FIG. 1, and the description thereof will be omitted here. The basic operation from ignition to combustion and extinguishing is also the same as that of the conventional device, and the description thereof is omitted here. The features of the present invention different from the conventional device will be described below.

FIG. 2 is a diagram showing a comparison between a value obtained by electrically measuring the size of a flame by the flame detection rod (10) shown in FIG. 1 (hereinafter referred to as a flame current value) and a combustion pattern. In FIG. 2, for example, when normal kerosene having a normal tar content is used, about 15 μA is measured for strong combustion and about 10 μA is measured for weak combustion. However, when bad kerosene containing a large amount of tar is used, the tar adheres to the nozzle hole, the combustion efficiency deteriorates, and the flame current value gradually decreases as shown in FIG.

According to the present invention, the tar adheres to the nozzle hole in this way, and the flame current value gradually decreases, so that the combustion state can no longer be maintained (in the example of FIG. 2, 4 μm).
At the stage before falling to A) (6 μA in the example of FIG. 2),
Once the combustion is stopped, for example 100 as shown in FIG.
A full-wave rectified voltage of V is intermittently applied to the electromagnetic solenoid (5) to reciprocate the needle (4) in the jet nozzle (2),
Clean the nozzle hole with the tip of the needle (4).

That is, in this invention, when tar adheres to the ejection nozzle (2) and combustion does not normally proceed, the needle is automatically
Since (4) reciprocates and removes tar, cleaning such as air baking is not required and the combustion state is always kept normal.

[Effects of the Invention] As described above, according to the present invention, when tar adheres to the jet nozzle and the nozzle hole is clogged, the combustion efficiency deteriorates, and the size of the flame during combustion becomes small, the flame detection means It detects this and automatically reciprocates the needle to clean the nozzle hole, so it is possible to automatically clean the jet nozzle not only at the time of ignition or fire extinguishing, but also when burning There is an effect that the combustion state can always be kept normal without requiring the cleaning of.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing the outline of the configuration of a liquid fuel combustion apparatus, FIG. 2 is a view showing a comparison between a flame current value and a combustion pattern, and FIG. 3 is a full-wave rectification for controlling an electromagnetic solenoid in the present invention. FIG. 4 is a diagram showing a voltage, and FIG. 4 is a diagram showing a control voltage applied to a conventional electromagnetic solenoid. (2) is a jet nozzle, (3) is a thermistor, (4) is a needle, (5) is an electromagnetic solenoid, and (10) is a flame detection rod. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A jet nozzle for jetting a vaporized gas obtained by vaporizing a liquid fuel from a nozzle hole, a needle for reciprocating in the jet nozzle to open and close the nozzle hole, and a size of a flame during combustion in an electric manner. In a liquid fuel combustion apparatus equipped with a flame detection means for detecting the magnetic field and an electromagnetic solenoid that reciprocates the needle, when the size of the flame during combustion detected by the flame detection means becomes equal to or less than a reference value. A liquid fuel combustion apparatus comprising: needle control means for intermittently energizing the electromagnetic solenoid a plurality of times to reciprocate the needle a plurality of times.