JPS60181513A - Combustion device for liquid fuel - Google Patents

Abstract

PURPOSE:To prevent abnormal combustion from taking place by a structure wherein a detecting means consisting of a light emitting element and a light receiving element is provided opposite to the liquid level gage of an auxiliary tank. CONSTITUTION:A detecting means consisting in providing a light emitting element 18 and a light receiving element 19 at the position confronting with a liquid level gage 14 provided on the side surface of a detachable auxiliary tank. In addition, a reflecting member 22 is arranged at the position opposite to the detecting means 20 so as to stop combustion after the predetermined period of time or instantaly after the detection of the emission of light of the light emitting element 18 by the light receiving element 19, when the fuel in the auxiliary tank falls below the predetermined liquid level or when the auxiliary tank is taken away. Thus, the abnormal combustion, which happens at a means to stop combustion by detecting the liquid level in a main tank with a float switch, can be prevented from occurring.

Description

[Detailed description of the invention] (a) Industrial application field The present invention includes a main tank that supplies fuel to a combustion section, and a transparent liquid level gauge that supplies fuel into the main tank and that is provided on the side. The present invention relates to a liquid fuel combustion device such as an oil heater equipped with a removable auxiliary tank.

(b) Prior art In conventional liquid fuel combustion devices such as oil heaters,
Disclosed in Japanese Utility Model Publication No. 57-48035, a float switch is built into the main tank that is supplied with fuel by a detachable auxiliary tank, and the float switch is activated when the fuel level inside the main tank falls below a predetermined level. The structure is such that the magnetic force of the attached magnet causes the switch to close or open to continue or stop combustion, but according to the above structure, the amount of fuel stored in the main tank is small. Therefore, when the fuel supplied from the auxiliary tank is stopped, if there is variation in the operation of the float switch or if dust or the like adheres to the float, the float switch will not operate properly, and air will be pumped together with fuel by the oil supply device. It is supplied to the combustion section. Therefore, a problem arises in that the balance with the constant amount of combustion air sent to the combustion section by the burner motor etc. is lost, and the combustion flame becomes abnormally large, resulting in abnormal combustion.

No. 0 Purpose of the Invention The present invention was invented in view of the above-mentioned conventional problems, and its purpose is to prevent abnormal combustion caused by the oil supply device supplying air together with fuel to the combustion section. There is.

B) Structure of the Invention The present invention comprises a detection means consisting of a light emitting element and a light receiving element disposed at a position facing a liquid level gauge provided on the side surface of a detachable auxiliary tank, and a storage chamber facing the detection means. When the fuel level in the auxiliary tank falls below the predetermined position of the liquid level gauge or when the auxiliary tank is removed, the light emitted from the light emitting element is reflected by the prism effect of the liquid level gauge or the reflective member provided on the side wall. The combustion control circuit is configured to stop combustion after a predetermined time or immediately after the light is reflected by one light receiving element and detected by one light receiving element.

(E) Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

FIG. 1 is an external perspective view of a liquid fuel combustion apparatus according to the present invention, which has a built-in burner for burning liquid fuel such as kerosene. (1) is an exterior case, (2) is a front panel, (3) is an outlet that blows out hot air when the burner burns, (4) is a stand fixed to the lower part of the exterior case (1), (5) is a display section that displays the operating status.

(6) is a top plate fixed to the upper part of the exterior case (1);
(The power is the operation door that closes the operation part that performs combustion operations, (
Reference numeral 8) is an opening/closing door that closes the upper surface of an auxiliary tank storage chamber α in which an auxiliary tank (9), which will be described later, is accommodated in the main body.

aυ is a confirmation hole through which the combustion flame of the burner can be seen during combustion.

α2 is the inside of a main tank (not shown) which stores fuel such as kerosene inside and is equipped with an oil supply means Q3 such as an electromagnetic pump that supplies fuel to the burner from a cap valve (not shown) provided at the bottom. This is an auxiliary tank that replenishes fuel. In addition, a translucent liquid level gauge made of glass or synthetic resin such as polycarbonate is installed at a suitable location below the circumferential side wall (9) forming the auxiliary tank (9), as shown in A-A in Fig. 3. As shown in the sectional view, it is fixed by a fixing fitting Oe via a sealing gasket (15).

Q7) is a tank guide that forms one side wall of the auxiliary tank storage chamber a@, and the tank guide (17) is provided with a protrusion (1?) that prevents the auxiliary tank (9) from swinging; A detection means consisting of a light emitting element α mark and a light receiving element 4, which will be described later, is supported and fixed by a fixture (21) at a suitable position facing the liquid level gauge α. In addition, a reflective member (2 (c) is the lead wire of the detection means (to).

Figure 4 is a sectional view taken along line B-B in Figure 2.
1 to explain the method of detecting the liquid level in the light emitting element Ql. If the fuel level in the auxiliary tank (9) is higher than the light emitting position of the light emitting element ) does not receive the light emitted from the light-receiving element (11&ma) because it travels straight through the fuel like (Bl) through the liquid level gauge (14), but the light-emitting element 0
If the fuel level in the auxiliary tank (9) falls below the light emitting position of light emitting element 08, the light emitting element of light emitting element 08 will stop at the level gauge (1).
The light is refracted as shown in (C) by the first prism surface (a) in −41, refracted as shown in +(D) by the second prism surface (b), and then received by the light-receiving element ring. be.

FIG. 5 shows an embodiment of a combustion control circuit for a heater. (To) is the AClooV commercial AC power supply, and this power supply (2) is connected to the power line (5) with a power switch (251) on one side. (To) is the power line (2e
(5) is a heating heater connected in parallel with the heating element (5), which uses the heat generated by the heater to heat the combustion part and vaporize the fuel.Although the nuclear heater (2) is not shown, it is heated by a bimetal thermometer, etc. It is configured to maintain a predetermined temperature (fuel vaporization temperature).

c! The mark is the burner motor that supplies combustion air to the combustion section.
In parallel with the burner motor shaft, there is provided an oil supply device consisting of an electromagnetic pump, etc., which supplies a predetermined amount of fuel to the combustion boundary section, and a spark plug, etc., which ignites the mixture of fuel and combustion air supplied to the combustion section. An ignition device OI consisting of a relay 01 to be described later.
) K is connected in parallel between the power supply lines (E) through a normally open relay switch which is opened and closed. The heater (c), burner motor (c), and oil feeding device a3
and the ignition device (to) constitute a combustion control circuit 0 to.

(to) is a rectifier circuit that rectifies the power (goods) supplied through the transformer (goods) connected between the power lines (2119 (5)) into direct current, c351 is the rectifier circuit (to)
This is a detection circuit that detects the liquid level of fuel or the presence or absence of the auxiliary tank (9) from the light-emitting element Ql and the light-receiving element Che using the DC voltage v0° output from the When it is detected that the fuel level is below a predetermined level or that the auxiliary tank (9) is removed, the relay switch G1) is opened to stop combustion.

FIG. 6 shows an embodiment of the liquid level detection circuit (to), which will be explained below.
The power supply lines (a) and (5) are connected in parallel through the rectifier circuit (to). Ql is a light-receiving element that detects the light emitted from the light-emitting element a barrel like the front liquid when the fuel level drops below a predetermined level or when the auxiliary tank (9) is removed, and has a resistance of 0? ) is connected in series with the power supply line (E) (27>), and is connected in parallel between the power supply lines (E) and (27>). The collector is connected to the connection point (a) of the resistor C3■
The emitter is connected to one of the power supply lines (a) via the emitter, and the emitter is connected to the earth line (5).

(41 is a NAND element, one input terminal (41) is connected to the power supply line (2), and the other input terminal (4) is connected to the collector of the first transistor (to) m and the resistor 6I. The second transistor is connected to point (b) (relay c31 connecting the fourth collector to one power line (c)), and the base of transistor 03 is connected to the Element (4G output end (44)
The emitter is connected to the earth line (5) through a resistor (45).

The present invention has the above-mentioned configuration, and its operation will be explained below.

When the power switch (c) is turned on, the power supply (goods) turns on the heater (
When the heater (to) is energized, the heater (to) generates heat and heats the combustion section. After turning on the power switch (c), turn on the power (2).
4) is the power supply voltage Va outputted via the transformer C14) and the rectifier circuit (to). The Hj level voltage is input to one input terminal (4m) of the NAND element (41), and the power supply voltage V, , is input to the base of the first transistor (to) via the resistor c3'/). Therefore, the transistor (
(to) is conductive, and the power supply voltage Vca is electrically connected to the earth line (27) via the resistor OI and the transistor (to). Therefore, the other input terminal (4 is the first
When the transistor (to) becomes conductive, the voltage becomes L0 level, and the NAND element (41) outputs the L0 level voltage.Therefore, the second transistor (4 becomes non-conductive and the relay 61) is demagnetized, and the relay switch O1 ) is released.

When the relay switch C31) is opened, the burner motor head and the oil supply device (131) supply fuel and combustion air to the thermal combustion section, and the air-fuel mixture generated in the combustion section is ignited by the ignition device (131). It ignites and continues combustion.

In addition, since the power supply voltage 'vcc is energized to the light emitting element AS via the resistor (to), it is issued to the light emitting element α Machiya and the liquid level gauge Q4J, but the fuel in the auxiliary tank (9) is kept at a predetermined level. If the above amount is stored, the light emitted will travel straight through the fuel in the auxiliary tank (9) as described above, so the light receiving element (to) will not detect (receive) the emitted light. To explain when the level falls below a predetermined level, as explained in Fig. 4, the light emitted from the light emitting element is refracted within the liquid level gauge a4, and as shown in (C) and (6), the light emitted from the light emitting element is refracted to the light receiving element. detects and receives the light emission.

Therefore, since the light-receiving element is a phototransistor, the power supply voltage VCC is passed through the resistor +37) to the ground line, so the base of the first transistor has the power supply voltage ■. . is no longer applied, and the first
The transistor (to) becomes non-conductive. Further, due to the non-conduction of the first transistor (to), the NAND element (41
The power supply voltage Vcc, which is a Hi level voltage, is inputted to the other input terminal of the NAND transistor (41) through the resistor (3I).Therefore, since the output of the NAND wire (41) outputs a Hi level voltage, the second transistor (41) outputs a Hi level voltage. Since the 4-bar conductor relay C311 is energized, the relay switch C11) is closed and the power supply Q4 is turned off to the burner motor shaft, the ignition device 0, and the oil supply device Ql.

To explain the case where the user removes the auxiliary tank (9) to refuel, etc., when the auxiliary tank (9) is removed, the light emitted from the light emitting element O8 is changed to the reflective member (2) attached to the other side wall. The light is reflected by the hot water, and the light receiving element detects (receives) the reflected light and stops the combustion as described above.

Further, the present invention is not limited to the above embodiment, but a timer circuit is connected between the output terminal (44) of the NAND element +41 and the base of the second transistor (43), and the light emitting element α Light-receiving element aIJ detects the light emitted from camphor tree (light reception)
The combustion may be stopped after a predetermined period of time has elapsed.

Furthermore, although one embodiment of the liquid level gauge Q4) used a liquid level gauge having a substantially triangular cross section, the present invention is not limited to the shape of the liquid level gauge I; It is sufficient that the light emitted from the light emitting element 0 enters the field a of the light receiving element when the light emitting element 0 descends further.

As described above, the present invention provides a reflecting member 03 at a position facing the detection means (2), and when the fuel in the auxiliary tank (9) falls below a predetermined liquid level, or when the fuel in the auxiliary tank (9) At the time of removal, the light receiving element detects the light emitted from the light emitting element a8 and combustion can be stopped after a predetermined time or immediately after that, so conventionally combustion was stopped by adjusting the fuel level in the main tank with a float switch. It is possible to prevent abnormal combustion that has occurred due to this method.

(f) Effect The present invention is as described above, and includes a detection means consisting of a light emitting element and a light receiving element at a position opposite to the liquid level gauge provided in the auxiliary tank, so that the fuel in the auxiliary tank is lower than a predetermined liquid level. When the tank is lowered or the auxiliary tank is removed, the light emitted from the light emitting element is reflected by the liquid level gauge or the reflecting member, and the light receiving element detects the reflected light and starts combustion after a predetermined time or after. Since it can be stopped immediately, a very safe liquid fuel combustion device can be provided.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of the liquid fuel combustion device of the present invention, Fig. 2 is a perspective view of an auxiliary tank, Fig. 3 is a sectional view taken along line A-A in Fig. 2, and Fig. 4 is a line B-- in Fig. 2. B sectional view, FIG. 5 is a schematic configuration diagram showing one embodiment of the combustion control circuit, and FIG. 6 is a detailed diagram of the detection circuit. (9)...Auxiliary tank, (10)...Auxiliary tank storage chamber, I...Liquid level gauge, 0 yen...Light emitting element,
I...light receiving element, wire...detection means, (2 hot water/
... Reflective member, (321... Combustion control circuit. Applicant Sanyo Electric Co., Ltd. and one other representative Patent attorney Shizuo Sano Figure 1 Figure 2 Figure 3 Dimensions - "?0ノ'

Claims (1)

[Claims] (1) Equipped with a main tank that supplies fuel to the combustion section and an auxiliary tank that supplies fuel into the main tank, and a prism-type liquid level gauge that displays the fuel level at an appropriate location on the side wall of the auxiliary tank. In the liquid fuel combustion apparatus, the auxiliary tank is housed in an auxiliary tank housing chamber, the detection means comprising a light emitting element and a light receiving element disposed at a position facing the liquid level gauge, and the detection means. When the fuel level in the auxiliary tank falls below the predetermined position of the liquid level gauge or when the auxiliary tank is removed, the light emitted from the light emitting element is reflected by the liquid level gauge. A liquid fuel combustion device comprising a combustion control circuit that stops combustion after a predetermined time or immediately after a prism effect or a reflection member detects the reflected light by a light receiving element.