JPS60144521A - Liquid fuel combustion apparatus - Google Patents

Abstract

PURPOSE:To prevent abnormal combustion caused by continuously supplying fuel and air to a flame chamber by an oil feeder, by actuating an alarm means, when a detecting means detects that a level of fuel in an auxiliary tank goes down lower than a predetermined level. CONSTITUTION:A photo emitting element 9 and a photo receiving element 10, composing a detecting means 8, are fitted to the suitable positions of a tank guide 5 respectively, facing to a liquid level gauge 2. When a fuel level in an auxiliary tank 1 is higher than the emitting position of a photo emitting element 9, an emission A from the photo emitting element 9 goes straight through fuel as shown by A', passing through the liquid level gauge 2, so that the photo receiving element 10 can not receive emission from the photo emitting element 9. When the fuel level in the auxiliary tank 1 goes down lower than the photo emitting level of a photo emitting element 9, an emission A from the photo emitting element 9 is refracted as shown by B by the primary prism surface 2' on the liquid level guide 2, and is further refracted by the secondary prism surface 2'' as shown by C, being sensed by the photo receiving element 10.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention provides a main tank that supplies fuel to a combustion section, and a removable tank that supplies fuel into the main tank and has a transparent liquid level gauge on its side. The present invention relates to a liquid fuel combustion device such as a kerosene heater equipped with a flexible auxiliary tank.

(b) Prior art In conventional liquid fuel combustion devices such as oil heaters,
A float switch is built into the main tank, which is supplied with fuel by a removable auxiliary tank, and when the fuel level inside the main tank falls below a predetermined liquid level, the switch is automatically closed by the magnetic force of the magnet attached to the float. However, according to the configuration described above, since the amount of fuel stored in the main tank is small, air and fuel may be released due to variations in the operation of the float switch. Since the oil is supplied to the combustion section by the oil supply device, the balance with the constant amount of combustion air sent to the combustion section from the burner motor f is disrupted, resulting in the combustion flame becoming abnormally large and causing abnormal combustion. It was causing problems.

(c) 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 supplying air together with fuel to the combustion section by an oil supply device. It is said that

B) Structure of the Invention The present invention provides a detection means that stops combustion after a predetermined time or immediately after when the fuel level falls below a predetermined position of a liquid level gauge provided on the side of the auxiliary tank, and the detection means The present invention is constructed so that, when it is detected that the fuel level in the auxiliary tank has fallen below a predetermined position, a notification means is provided to notify the user of the fall in the fuel level.

(E) Embodiment One embodiment of the present invention will be described below based on FIGS. 1 to 6. In (1), fuel is stored inside and the fuel is supplied from a cap valve (not shown) provided at the bottom. Tank (not shown)
This is an auxiliary tank that replenishes fuel inside. In addition, a synthetic material such as glass or polycarbonate is placed at a suitable place below the peripheral side wall (1) forming the auxiliary tank (1) so that the user can check the remaining amount of fuel in the auxiliary tank (1) from the outside. The translucent liquid level gauge (2) made of resin is shown in the A-A sectional view in Figure 2 (with the sealing gasket (3)
) is fixed by a fixing metal fitting (4).

(5) is a tank guide that prevents rocking when the auxiliary tank (1) is housed inside the heater body using a protrusion (5), etc., and is placed in an appropriate position facing the liquid level gauge (2) as described later. A liquid level detection means (8) is supported and fixed by a support fitting (6). (The force is the lead wire of the sensing means (8).

FIG. 3 is a sectional view taken along the line B-B in FIG. 1. The fuel level detection method of the present invention will be explained below. is attached to a suitable position on the tank guide (5) facing the liquid level gauge (2), and when the fuel level in the auxiliary tank (1) is above the light emitting position of the light emitting element (9), , the light emission (A) from this light emitting element (9) is detected by the liquid level gauge (
2), the light-receiving element 00) does not receive the light emitted from the light-emitting element (9) because it travels straight through the fuel as shown in (A). When the fuel level in the auxiliary tank (1) decreases, the light emitted from the light emitting element (9) (At is 03) by the first prism surface (2) in the liquid level gauge (2) is refracted and emitted. Due to the two prism surfaces <A, the light is refracted as (0) and is received by the light receiving element.

FIG. 4 is a schematic configuration diagram of a circuit of an oil heater that is an embodiment of the present invention, and (11) is an AClooV commercial AC power supply, and the power supply (11) is connected to a power switch (121'e) on one side. The first relay switch (16a) is connected in series to the power supply lines (13) and (14), and a heater is connected in parallel to the power supply lines 13 and (14). The combustion section is heated by the heat generated by the heater Q51 to vaporize the fuel. Further, the first relay switch (16a) is opened when the temperature of the heater Q, which will be described later, rises to a predetermined temperature, and heats the combustion part by the combustion heat of the combustion flame (heat back).
The temperature of the combustion section is maintained at the vaporization temperature of the fuel.

07) is a burner motor that supplies combustion air to the combustion section,
In parallel with the burner motor (1?), an oil supply device fil consisting of an electromagnetic pump or the like that supplies a predetermined amount of fuel to the combustion section, and a spark plug that ignites the mixture of fuel and combustion air supplied to the combustion section. The burner motor (17+, the oil supply device (111), and the ignition device OI are connected to a second relay switch (20a), which will be described later.
) is connected in parallel to the power supply line (13+ (+41). The combustion circuit (21 ).

■ is a power supply 01)' supplied via a transformer (c) connected in series to the power line ++ 31 (14)
& Rectifier to DC □The rectifier circuit that flows, Qa is the rectifier circuit (
This is a combustion control circuit that controls combustion using the DC voltage output from the company.

Fig. 5 shows an output terminal to which the rectifier circuit q is inputted via a lance (c) showing an embodiment of the combustion control circuit. One output terminal (c) is connected to the DC voltage vCc line (hereinafter referred to as the power It is connected to line 5) (2 [Yes], and the other output terminal (c) is connected to ground.

(9) is a light emitting element that emits light to the liquid level gauge (2) as the fuel level detection means (8), and one end is connected to one of the 12 power lines via a resistor (5), and the other end is connected to the ground. Connected. α[ is a light receiving element that detects the light emission of the light emitting element (9) as explained in FIG. and one power line (
When connected to 251, the other end is connected to ground. In addition, the light emitting element (9), the light receiving element 00) and the resistor (2'0(
C) constitutes a liquid level detection circuit C29).

00) is the first transistor, and the transistor (to)
The base is connected to the connection point (a) between the resistor (2 sand and the light receiving element (1o)), the collector is connected to one power supply line (251) via the resistor 01, and the emitter is connected to ground. ing.

C33 is a NOR cable, and one input side is connected to the resistor (31
) and the collector of the first transistor (b) are connected at the connection point (b) K, and the other input side is connected to the output side of a comparator (44) to be described later. Further, the output side of the NOR element C32+ is connected to the pace of the second transistor Oa via a resistor (c), and the collector of the second transistor C34) is connected to the second relay switch (20a). ) is connected to one power supply line (25) via the @1 relay (a) that closes or opens the line.

(to) is a NOT element, and the input side is connected to the connection point (alK) between the resistor (2) and the light receiving element On, and the output side is connected in series to the base of the third transistor Gη via the resistor (to). The collector of the third transistor G'7) is connected in series with one power supply line (251 is a resistance stage) and a light emitting diode (a) serving as a notification means in the forward direction. NOT wire 451 and third transistor 07), light emitting diode and resistor (361 (38
) constitutes the notification circuit (40).

15ol is the heater (+51 control circuit, (41
) is a burner thermistor whose internal resistance value decreases as the temperature of the combustion part increases due to the heater a, and one end of the burner thermistor (41) is connected to one power supply line (c) via a resistor (421). and resist the other end (
4 (connected to ground via ).

(44) is a comparator whose inverting input side is connected to the connection point (cl) between the burner thermistor (4I) and the resistor (42), and the non-inverting input side is connected to one power supply line (cl) via the resistor (45). c) and the nuclear non-inverting input side and the resistor (49
The connection point (d) is connected to ground via a resistor (461).

(47) passes the pace through the resistor (49) to the comparator (
44) on the output side of the connection point (e
A fourth transistor is connected to the collector, and the collector is connected to the heater 09 through a second relay 06) that closes or opens a first relay switch (16a) that energizes the power source (11). It is connected to one power supply line (c) and its emitter is connected to ground. Further, the connection point (fl) between the fourth transistor (collector of 4η and the second relay 06) and the connection point (dl) between the non-inverting input side of the comparator (44) and the resistor (46) are the resistance ( Connected through 4 barrels.

The present invention has the above-mentioned configuration, and its operation will be explained below. When the power switch 02 is turned on, one power supply line (C) is supplied with a DC voltage (C) via the power transformer (C) and the rectifier circuit (23). A voltage divided by the resistor (45) and @e is applied to the non-inverting input side of the comparator (44) and a cough comparator (referred to as cc) is applied to the non-inverting input side of the comparator (44J). A voltage divided by the resistor (42, burner thermistor, and resistor 131) is applied.

The burner thermistor (4υ) has a large internal resistance value because the temperature of the combustion part is low, and a voltage of H4 level is applied to the inverting input side than to the non-inverting input side.Therefore, the comparator (44)
outputs a Hi level voltage and is input to the base of the fourth transistor (4η) via the resistor (49), so the transistor (47) conducts and the second relay (excites the The first relay switch (16a) is closed and starts energizing the heater (+51).

When the first relay switch (16a) is closed, power is supplied to the heater (151), so the heater (111) generates heat and raises the temperature of the combustion section to a temperature at which the fuel is vaporized, and the burner thermistor Since the internal resistance value of the comparator (44) decreases, the inverting input side of the comparator (44) becomes a Lo level voltage, and the output of the comparator (441) outputs a Lo level voltage. The transistor No. 4 (4η is made non-conductive and the second relay 06) is demagnetized. Therefore, the first relay switch (16a) is opened and the power supply 01) to the heater 051 is stopped.

Further, when the power switch 030 is turned on, the power source Vc,
Since the input is input to the first transistor (to) through the resistor (c), the transistor (to) is conductive and the power supply (cc is the resistor C11) and the transistor (7)
Since the NOR element 02 is energized to ground through the NOR element 02, a Lo level voltage is applied to one input side of the NOR element 02, and the output level of the comparator (44) is applied to the other input side. The comparator (44) is a heater 09.
When energized, it outputs a Hi level voltage, and the N
The OR element 02) continues to output the Lo level voltage, and when the comparator (44) outputs the Lo level voltage (when the power supply to the heater (15) is stopped), one and the other input side of the NOR element C321 Since a Lo level voltage is applied to the NOR element 0, the NOR element 0 outputs a Hi level voltage, which is applied to the second transistor 04) via the resistor 031. Therefore, the second transistor (34) conducts, energizes the first relay (2υ), closes the second relay switch (20a), and supplies a predetermined amount of combustion air from the burner motor a7) and the oil supply device 0 hammer. A predetermined amount of fuel is supplied to a combustion section at a predetermined temperature (fuel vaporization temperature), and the vaporized gas generated is ignited by an ignition device a to continue combustion.

Next, the operation when the light-receiving element a detects the light emission of the light-emitting element (9) will be explained. The light-emitting element (9) is energized by the power source V through the resistor (water) from the time the power switch O2 is turned on. The auxiliary tank (1) emits light.
If the fuel level in the
As explained in the figure, the light emitted from the light emitting element (9) is transmitted to the light receiving element 00.
) detects (receives light) and turns on the power. is applied to the ground via the resistor (c) and the light receiving element 00).

Therefore, the pace of the first transistor C30) depends on the power supply V
Since c is no longer applied, the first transistor (
7) becomes non-conductive, and the Hi level voltage of the power supply cc is inputted to one input side of the NOR element 02 via the resistor c31). Therefore, the output of the NOR element C325 becomes a Lo level voltage and makes the second transistor 04 non-conductive, so that the first relay is demagnetized and the second relay switch (20a) is opened to open the combustion section. This is to stop the combustion of

Also, resistor c! on the input side! 8) and the connection point (
The NOT element c351 connected to at is connected to the power supply vcc0'')H when the light receiving element 00) is not detected (not receiving light).
Since the l level voltage is applied through the resistor, L
o Continues to output level voltage, but the light receiving element 00)
When detects (receives) light emission from the light emitting element 1), the light receiving element 00) becomes conductive and the power supply VCC is energized to the ground via the resistor (c) and the light receiving element 00).
The input side of the OT element 0 (G) becomes a Lo level voltage, and the Hi level voltage output from the NOT element OQ is the resistance (
30 to the third transistor (39) to make the third transistor (37) conductive, the power supply Vcc is connected to the ground through the resistor (goods) and the light emitting diode (31) and the transistor CD. Therefore, as mentioned above, combustion stops and the light emitting diode C
3 (g) lights up to notify the user that combustion has stopped due to fuel exhaustion.

Furthermore, the present invention is not limited to the above configuration,
As shown in FIG. 6, the second transistor r34) is indirectly connected to the N0rt element 02 via a comparator 6'D. That is, by connecting the capacitor 52, which is charged when the NOR element < 321 is outputting a Hi level voltage, to the inverting input side of the comparator 6υ via the resistor 63), the NOR element
Even if the OR element 021 outputs a Lo level voltage, the voltage on the inverting input side of the comparator 6υ remains higher than that on the non-inverting input side for a predetermined period of time due to the discharge voltage of the six capacitors.
Since the level voltage is maintained, the combustion will not be stopped while the light emitting diode O1 notifies the user that the fuel is running out and if the user replenishes the fuel while the combustion continues due to the discharge of the capacitor 6.

Furthermore, although the light emitting diode 0I is used as the notification means, the light emitting diode C39) may be turned on in a time-sharing manner (also, the notification means may be made to notify the user by a sound such as a buzzer). Furthermore, the light emitting diode O
I and the buzzer may be activated at the same time.

(F) Effect The present invention is as described above, and includes a detection means for detecting the fuel level using a translucent liquid level gauge provided on the side of the auxiliary tank, and detects when the fuel level has fallen below a predetermined position. Combustion can sometimes be stopped after a predetermined period of time or immediately after that, and a notification means is provided to notify the user when the fuel level has fallen below a predetermined level. To provide a liquid fuel combustion device that is more convenient for the user, since the person can confirm the situation, and the combustion can be stopped (or continued) by refueling when the notification by the notification means starts. It is possible.

[Brief explanation of drawings]

1 to 6 show an embodiment of the present invention,
FIG. 1 is a perspective view of the auxiliary tank, FIG. 2 is a sectional view, FIG. 4 is a schematic diagram of the combustion circuit, FIG. 5 is a detailed diagram of the circuit, and FIG. 6 is another embodiment. (1)...Auxiliary tank, (2)...Liquid level gauge,
(9)...Light emitting element (detection means), 00)...
Light receiving element (detection means) 0!1... Light emitting diode (notification means). Applicant Sanyo Electric Co., Ltd. and 1 other agent Patent attorney Shizuka Sano

Claims (1)

[Claims] (Equipped with a main tank that supplies fuel to the combustion section, and a removable auxiliary tank that supplies fuel into the main tank and has a translucent liquid level gauge on its side, and further includes the liquid level gauge and A detection means is provided at an opposing position to stop combustion after a predetermined time or immediately after when the fuel level in the auxiliary tank falls below a predetermined position; 1. A liquid fuel combustion apparatus characterized in that a liquid fuel combustion apparatus is provided with a notification means for notifying a user of a decrease in fuel level when a decrease in fuel level is detected.