JPS6238135Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a liquid fuel combustion device for use in space heaters and water heaters, which gasifies and burns liquid fuel such as petroleum using a vaporizer.

As this type of combustion apparatus, for example, an oil gasification heater has conventionally performed combustion control as shown in FIG. That is, the energization control to the vaporization heater provided in the vaporizer is performed according to the temperature of the vaporizer by the vaporizer temperature detection element, and combustion is stopped between the first set temperature T1 and the second set temperature T2. The power supply to the vaporization heater is interrupted even while the room temperature is in the room, so that if the room temperature falls below a set value, the fuel can be immediately gasified by the vaporizer. However, when the heat load is small and the time from combustion to combustion is relatively long, it is a useless energy consumption to maintain the carburetor in the combustion position all the time as described above. A situation with a small heat load is, for example, a situation where the room temperature is not very low from a heating perspective, and in terms of time of year, it is early winter or early spring. Therefore, under these conditions, the heating effect due to combustion will decay relatively slowly, and even if the vaporizer is heated and then combustion is started, the heating effect will hardly be impaired, and the vaporizer can be kept in the combustion position at all times. The need to do so is much weaker than in the cold season, and rather the energy consumption to maintain the temperature of the vaporizer becomes a problem.

This invention aims to solve the above-mentioned conventional problems, and allows the user to arbitrarily release the temperature maintenance by the vaporization heater of the vaporizer depending on the heat load situation. The present invention provides a liquid fuel combustion device with a simple electric circuit configuration that enables combustion operation with less energy wastage.

Next, the configuration of the present invention will be specifically explained based on an embodiment shown in the drawings.

The combustion device shown in FIG. 2 as an application example of the present invention is for an oil gasification heater, and includes a heater circuit that directly controls the energization of a vaporization heater 1 attached to a vaporizer that gasifies oil. , by opening the heater circuit, the SCR 3 as a switching element outputs to the control circuit 2 that performs combustion control of the combustor, and the heat load, that is, the room temperature, is detected and output based on this, and the control circuit 2 and a load response circuit which constitutes a signal for causing combustion in cooperation with the output of the SCR 3. The heater circuit is comparator 4
When the voltage becomes H level by the POSISTOR 5 as a vaporizer temperature detection element connected to its input side, a forward voltage is applied to the base of the transistor 6 on the output side, making the transistor 6 conductive. A relay 7 is connected to the collector side of the transistor 6, and when the transistor 6 becomes conductive, the relay 7 is also excited, and the normally open contact 7A of the relay 7 connected in series with the vaporization heater 1 is closed, and the power supply 8 is connected to the vaporization heater 1. Supplied. When the POSISTOR 5 detects that the vaporizer temperature has reached the first set temperature T1, the comparator 4 is inverted from the H level and goes to the L level, causing the base voltage of the transistor 6 to drop. This causes transistor 6 to become non-conductive,
The relay 7 is also demagnetized and the power to the vaporization heater 1 is cut off. In other words, when the vaporizer reaches a temperature that allows the oil to be gasified and is ready for combustion,
The supply of electricity to the vaporization heater 1 is then stopped.
On the other hand, the switching element SCR3 has its gate connected to the collector side of the transistor 6 via a diode 9, and when the transistor 6 becomes conductive, the anode becomes non-conductive, and when the transistor 6 becomes non-conductive, it becomes conductive. , and an output appears to the control circuit 2 in the conductive state. That is, the output of the SCR 3 is input to the control circuit 2 as information that the carburetor has reached its functional state. However, even if this SCR 3 is showing an output, if the load response circuit is not showing an output, the control circuit 2 will not operate to cause combustion. In the load responsive circuit, when the thermistor 10, which is the room temperature detection element, detects a temperature lower than the set room temperature, the comparator 11 becomes H level, and the control circuit 2 connected to the output terminal of the comparator 11
It outputs to. Therefore, when the thermistor 10 detects a temperature higher than the set room temperature, the comparator 11 becomes L level and no output appears at its output terminal. That is, when the comparator 11 of the load response circuit is set to H level by the thermistor 10 and the SCR 3 is in a conductive state, the control circuit 2 operates to cause the combustor to start combustion. be.

When combustion starts, the vaporizer is kept at a high temperature by the flame, and combustion continues while the energization of the vaporization heater 1 is stopped. When the room temperature rises and reaches the room temperature set by the thermistor 10, the thermistor 10 inverts the comparator 11, which had been at H level, to L level.
The output of the load response circuit to the control circuit 2 disappears,
Combustion stops. When combustion stops, the vaporizer gradually cools down because it no longer receives heat from the flame. When the vaporizer temperature drops to the second set temperature T2 set by the POSISTOR 5, the comparator 4 becomes H level, the heater circuit is closed, and the vaporizing heater 1 is turned on. The vaporizer temperature is set to the first set temperature T by the vaporizer heater 1.
When it recovers to 1, the comparator 4 goes to L level, the heater circuit opens, and the energization to the vaporization heater 1 is stopped. In other words, the heater circuit is
It uniquely maintains the vaporizer temperature between the second set temperature T2 and the first set temperature T1 by intermittently energizing the vaporizing heater 1. During this period, if the room temperature falls while the transistor 6 is in a non-conducting state, the thermistor 10 detects this, the comparator 11 goes to H level, and the conditions for operating the control circuit 2 are established and combustion starts. The above-mentioned operation corresponds to the conventional control content shown in FIG. 1, and is an operating state corresponding to the severe cold season. That is, during the cold season, the heating load is large and the stop time is short compared to the combustion time. Therefore, even if combustion is stipulated intermittently at room temperature and the vaporizer is always on standby ready to start combustion, the energy required to maintain the vaporizer temperature is small and is used effectively, so this is not a problem. There isn't. However, under similar conditions such as early winter or early spring when the heating load is small, the stop time is longer than the combustion time, and the energy consumption to maintain the vaporizer temperature and keep the vaporizer on standby tends to increase. . Moreover, in such a situation, the rate of decrease in room temperature is slow, so the need to start combustion at the same time as the room temperature decreases is extremely weak in severe cold weather.

Therefore, the combustion apparatus of this embodiment is configured to be able to switch to the control content as shown in FIG. 3. That is, as shown in FIG. 2, the point between the comparator 4 and the transistor 6 in the heater circuit and the output terminal of the comparator 11 in the load responsive circuit are connected by a circuit that can be opened and closed by a changeover switch 12. -ing This circuit's changeover switch 12
If it is left open, combustion control suitable for extremely cold seasons will be carried out, in which the carburetor is always on standby as described above. When this circuit is closed by the changeover switch 12, when the room temperature is high, the comparator 11 is at the L level, the output terminal of the comparator 4 is also fixed at the L level through the circuit, and the transistor 6 is turned off. Conductivity is established, and the supply of electricity to the vaporization heater 1 remains stopped. When the comparator 11 becomes H level due to a decrease in room temperature, the transistor 6 becomes conductive, and the vaporization heater 1 starts to be energized to prepare the vaporizer for functioning. In other words, the carburetor is heated after detecting a drop in the room temperature, and after that is completed, the SCR 3 outputs a signal indicating completion of preparation to the control circuit 2, and combustion begins. In this way, when the selector switch 12 is closed, combustion will begin after the carburetor is ready to function, but the drop in room temperature during this period will be slight unless it is a very cold season, and the heating effect will be reduced. This will not cause any damage, and the energy savings will be significant.

Note that the present invention can be applied to a combustion device for a water heater without causing any problems.

As is clear from the above description of the embodiments, the liquid fuel combustion device of the present invention controls the energization to the vaporization heater of the vaporizer that gasifies the liquid fuel depending on whether the heat load is large or small. The structure is such that the vaporizer temperature can always be maintained at a state where it can perform its vaporizing function, and it can also be set to a state where it can perform its vaporizing function when necessary. The power supply to the vaporization heater can be controlled more effectively depending on the load situation, eliminating the energy waste caused by the vaporization heater.The circuit configuration is simple, and the user can individually energize the vaporization heater as needed. It has the advantage that the style can be easily changed.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the operation of a combustion device as a conventional example, FIG. 2 is a circuit diagram showing a combustion device as an application example of the present invention, and FIG. 3 is an explanatory diagram showing the operation of the combustion device. . Note that the same reference numerals in the figures indicate the same or equivalent parts. 1... vaporization heater, 2... control circuit, 3...
SCR, 4... Comparator, 5... Posistor, 6... Transistor, 7... Relay, 7A...
... Normally open contact, 10 ... Thermistor, 11 ... Comparator, 12 ... Changeover switch.

Claims (1)

[Scope of utility model registration request] A heater circuit that controls on/off the power supply to the vaporization heater installed in the vaporizer that gasifies liquid fuel and supplies it to the combustor, depending on the temperature of the vaporizer detected by the vaporizer temperature detection element, and a heater circuit that closes the heater circuit. It includes a switching element that expresses an output depending on the temperature, and a heat load detection element, which outputs an output in a high load situation where the temperature detected by the heat load detection element is lower than the set temperature, and works with the output of the switching element to generate an output in the combustor. and a load response circuit that causes the control circuit to configure a signal for causing combustion, and between the load response circuit and the heater circuit,
a circuit for applying the output of the load responsive circuit to the heater circuit side as an input for operating the heater circuit so that the heater circuit can respond to the operation of the load responsive circuit operated by the thermal load sensing element; A liquid fuel combustion apparatus characterized in that the circuit is provided with a changeover switch for opening and closing the circuit.