JPH0227329Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a combustion control device based on the amount of remaining kerosene in an oil hot air heater (hereinafter referred to as an oil fan heater) equipped with a room temperature control device.

Problems to be Solved by Conventional Technologies and Ideas Traditionally, when the amount of kerosene used for combustion decreases to below a certain level, oil fan heaters use a lamp or buzzer to remind people around them of the need to refuel. There was also a system that controlled the system to stop operation if the refueling operation was not performed after a certain period of time had elapsed. This will be explained with reference to FIG. In Fig. 1, 1 is a kerosene tray for combustion, 2 is a float switch that detects the amount of kerosene remaining in the oil pan 1, and 3 is a float for the float switch 2, which keeps up with the oil level in the oil pan 1. and move. 4 is a lead wire of the float switch 2, and when the remaining amount of kerosene exceeds a certain amount, the terminals 4 are short-circuited, and when it is below a certain amount, they are open. 5 is a kerosene cartridge tank, and 6 is an oil pipe that sends oil from the oil receiving tray 1 to the combustion machine. In operation, when there is sufficient kerosene, kerosene is supplied from the cartridge tank 5 to the oil tray 1, the kerosene level is at position 7, and terminals 4 of the float switch 2 are short-circuited. As the kerosene gradually decreases, the kerosene in the cartridge tank 5 runs out and the supply stops, so the kerosene in the oil pan 1 decreases and the kerosene level drops in directions 7 to 8. When the voltage drops to level 8, the terminals 4 of the float switch 2, which had been shorted until then, are opened. In response to this signal, the control device prompts the need for refueling with a lamp, a buzzer, etc. Thereafter, normal combustion is performed for a certain period of time T, and combustion is stopped after the certain period of time T has elapsed. At this time, it is better that at least a small amount of kerosene remains in the oil pan 1. This is because during normal combustion, if there is no kerosene at all, combustion becomes unstable. Therefore, in general, when stopping, the oil level must be kept at level 9, which is slightly above the upper end of the oil pipe 6. In other words, the amount of kerosene that can be consumed within a certain period of time T is level 8.
Since it is determined by the internal volume V of the oil pan from level 9 to level 9, there is a drawback that in order to lengthen the fixed time T, the volume V must be increased.

Means for Solving the Problems The present invention was developed to overcome the above-mentioned drawbacks, and it is possible to detect the room temperature, set the desired room temperature, and adjust the amount of combustion according to the relationship between the actual room temperature and the desired room temperature. In a kerosene fan heater that can vary the amount of kerosene, it not only prompts the need for refueling when the remaining amount of kerosene drops to level 8 or below, but also automatically switches the set temperature to the lowest temperature that can be set. The aim is to reduce the consumption of kerosene and to lengthen the predetermined advance notice period T.

Function: It is possible to lengthen the predetermined notice period without increasing the volume of the oil pan.

Embodiment Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a circuit diagram of an implementation according to the present invention. Reference numeral 10 denotes a commercial power source, both ends of which are connected to the full load 13 of the oil fan heater via a normally open contact 11a of a relay 11, which will be described later.
It is connected to a strong/weak combustion switching load 14 via a normally open contact 11a of a relay 12, which will be described later, and to a transformer 15 via a normally open contact 12a of a relay 12, which will be described later. When relay contact 11a is on, combustion is in progress; when it is off, it is stopped; when relay contact 12a is on, it is strong combustion, and when it is off, it is weak combustion. . The secondary side of the transformer 15 is connected to a DC power supply circuit 16. The DC power supply circuit 16 supplies DC power for the control circuit of this circuit. 17 is a kerosene remaining amount detection circuit, and the kerosene float switch 2 is connected to its input.
are connected via lead wires 4. The output 18 of the kerosene remaining amount detection circuit 17 is connected to the base of a transistor 20 via a resistor 19. transistor 20
The collector output of is connected to drive a buzzer 21, an indicator LED (refueling lamp) 22, and a relay 30. Further, another output 24 of the kerosene remaining amount detection circuit 17 is inputted to an electronic timer circuit 26. Further, the output 25 of the electronic timer circuit 26 is the kerosene remaining amount detection circuit 1.
7 is input. Another output 27 of the electronic timer circuit 26 is connected to a transistor 29 via a resistor 28.
connected to the base of The collector of transistor 29 is connected to drive relay 11. The combustion amount switching circuit is controlled based on a thermistor 33 that detects room temperature and converts it as a resistance value. 3
4 is a variable resistor for setting the room temperature, and 35 is a resistor having the maximum resistance value of the variable resistor 34. 3
Reference numeral 7 designates a converter for room temperature comparison, and a voltage determined by the voltage division of the variable resistor 34 or resistor 35 located after the thermistor 33 and the switching contact 30a of the relay 30 described above is applied to its non-inverting input. Ru. A variable resistor 34 is connected to the switching contact 30a of the relay 30 on the normally closed contact side, and a resistor 35 is connected to the normally open contact side. Further, a reference voltage divided by a resistor 38 and a resistor 39 is applied to the inverting input of the comparator 37 . The output of the comparator 37 is connected to the positive power supply via a resistor 40 and to a transistor 42 via a resistor 41.
connected to the base of The collector output of transistor 42 is connected to drive relay 12.

Next, the operation of one embodiment of the present invention will be described.
When the remaining amount of kerosene in the oil pan 1 is above level 8, the terminals of the float switch 2 are short-circuited, and at that time, the output 18 of the kerosene remaining amount detection circuit 17
is "L", so the transistor 20 is off, and the buzzer and LED remain off. Since the relay 30 is also off, the voltage divided by the combined resistance of the thermistor 33 and the variable resistor 34 is applied to the signal to the non-inverting input of the comparator 37, and this voltage and the reference inverting input signal are used to input the comparator 37. 37 output changes, relay 1
2 is on/off controlled and has a strong/weak combustion switching load 14
is controlled to be energized/de-energized, thereby switching between strong and weak combustion. When the oil level gradually decreases and the oil level falls below level 8, the terminal of the float switch 2 becomes open, and at that time, the output 1 of the kerosene remaining amount detection circuit 17
8 becomes "H". Therefore, the transistor 20 is turned on, and the buzzer and LED are also turned on. This alerts those around you to the need for refueling. Further, since the relay 30 is also turned off, a divided voltage value based on the combined resistance of the thermistor 33 and the resistor 35 is applied to the signal to the non-inverting input of the comparator 37. Therefore, the set temperature when there is sufficient kerosene is determined by the variable resistor 34, but when there is a shortage of kerosene, the set temperature is determined by the resistance value of the resistor 35. Since the resistance value of the resistor 35 is the maximum resistance value of the variable resistor 34, the set temperature is the lowest temperature that can be set. As a result, strong/weak combustion is normally controlled to keep the room temperature stable around the set temperature, so since the set temperature has reached the minimum set temperature, the combustion is more frequently performed at low intensity, which reduces the apparent amount of kerosene consumption. do. In addition, another output 2 from the kerosene remaining amount detection circuit 17
4 generates an insufficient signal for the amount of remaining kerosene to the electronic timer circuit 26, and in response to this signal, the electronic timer 26 delays T for a certain period of time. If refueling is not performed within a certain period of time T, then "L" is output to the output 27 of the electronic timer circuit 26, the transistor 29 is turned off, and the relay 11 is also turned off, so that all of the oil fan heaters are turned off. load 1
No. 3 becomes a non-conducting state, and the combustion state becomes a stop mode. At the same time, electronic timer circuit 2
Another output 25 of 6 can also stop the refueling warning buzzer and LED if necessary.

Effects of the invention As described above, according to the invention, when the remaining amount of kerosene drops below a certain level in the oil pan, it is possible to prompt the need for refueling and to automatically set the temperature. By switching to the lowest temperature,
By reducing the apparent consumption of kerosene, the fixed advance notice period T can be lengthened.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the residual amount of kerosene detecting portion used in the conventional method and the present invention, and FIG. 2 is a schematic electrical configuration diagram of a control device according to an embodiment of the present invention. 1... Oil pan, 2... Kerosene float switch, 5... Cart cartridge tank, 17... Kerosene remaining amount detection circuit, 13... Full load, 14... Strong/weak combustion switching load, 23... Combustion amount switching circuit , 26...electronic timer circuit.

Claims (1)

[Scope of utility model registration request] In a combustion control device based on the remaining amount of kerosene for an oil hot air heater, which is equipped with a cartridge tank and an oil tray, and controls the amount of combustion based on the set temperature and room temperature, the kerosene float switch 2 installed in the oil tray 1 is used to When it is detected that the kerosene in the oil tray 1 is decreasing and the remaining amount is below an arbitrary certain level 8, the kerosene shortage signal is input to the kerosene remaining amount detection circuit 17, and the output is sent to the electronic timer circuit 26 and combusted. The total load 13 and the strong/weak combustion switching load 14 are controlled by their outputs, and the fire is automatically extinguished at any fixed time T, and the set temperature is automatically changed within any fixed time. A combustion control device based on the amount of remaining kerosene, which is characterized by setting the lowest temperature that can be set.