JPH03217712A - oil burning machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to temperature control of a vaporizer cylinder of an oil-burning machine.

BACKGROUND OF THE INVENTION Conventionally, this type of oil-burning machine has been constructed as shown in FIG. 4, in which 1 is a heat exchanger, 2 is a burner for heating the heat exchanger 1,
3 is a vaporizer for sending vaporized kerosene to the burner 2; 4 is a vaporization heater built into the vaporizer; 5 is a vaporizer thermistor for detecting the temperature of the vaporizer; 6 is a vaporizer for sending kerosene to the vaporizer 3. A pulse pump, 7 a blower motor that supplies combustion air to the burner 2, and 8 a controller that controls these loads. Next, a block diagram of the controller 8 is shown in FIG.

In FIG. 5, 9 is an operation switch, 10 is an input circuit for inputting the operation switch, 11 is a combustion control circuit that controls combustion of the burner 2 in response to a signal from the input circuit 10, and includes a blower motor 7, a pulse pump 6, Controls the vaporization heater 4. Further, 12 is an input circuit of the vaporizer thermistor 5;
3 is a timer circuit for determining disconnection of the vaporizer thermistor 5, both of which are connected to the disconnection detection circuit 14 to stop the vaporizer heater 4 abnormally. With this configuration, first the operation switch 9 is turned off.
When the signal is turned on, the signal is input to the input circuit 10, the heater 4 is turned on via the combustion control circuit 11, and preheating of the vaporizing section is started. At the same time, the disconnection determination timer l3 is driven, and when the timer 13 expires, the thermistor 5
The signal is input to the vaporization section temperature detection circuit via the input circuit 12, and it is determined whether the temperature of the vaporization section has exceeded a predetermined temperature. If the temperature is below a predetermined temperature, the motor 4 is turned off as a disconnection or heating failure.

Here, the reason why a disconnection determination timer is necessary is that the temperature of the vaporizing section is generally controlled to about 250"C, so a high temperature thermistor is normally used as the sensor, so the temperature at room temperature at the start of preheating is In this state, the thermistor has a high resistance value and cannot be distinguished from a disconnection state.Therefore, it is necessary to energize the heater for a predetermined period of time to raise the temperature of the vaporization section before making a determination. The temperature of the vaporizing section is always detected via the input circuit 12 to check whether the vaporizing section maintains a temperature sufficient to generate sufficient vaporized kerosene for good combustion even if the combustion state occurs after the temperature rises above the above level. If the temperature of the vaporizing section falls below the specified temperature due to overshooting of the combustion capacity, etc., the heater 4
Turn off.

Problems to be Solved by the Invention However, in the above configuration, when the operation switch 9 is operated, the heater 4 is ONL and the disconnection determination timer l3 is activated.
After being energized for a predetermined period of time, a disconnection will be detected. If the temperature at which a wire breakage or heating failure is determined is a temperature that generates sufficient vaporized kerosene for good combustion, the time set by the wire breakage determination timer 13 indicates that the temperature of the vaporizer section 3 is from room temperature to good. In addition to the time it takes for the temperature to rise to the point where sufficient vaporized kerosene is generated for proper combustion, it is also necessary to consider the variation in temperature rise due to the installation environment of the equipment, so it is necessary to take into consideration the dispersion of temperature rise due to the installation environment of the equipment. It will take a considerable amount of time.

In addition, in order to shorten the time it takes to detect a disconnection or determine that there is a heating failure, if the temperature is set well below the temperature that generates enough vaporized kerosene for good combustion, the vaporized kerosene When the temperature of the vaporizing section 3 reaches a predetermined temperature and enters a combustion state, the temperature of the vaporizing section 3 falls below a temperature sufficient to generate enough vaporized kerosene for good combustion due to overcombustion capacity, etc. In other words, even when there is a failure in vaporization, combustion continues for a certain period of time until a disconnection is detected or a heating failure is detected and the heater 4 is turned off, resulting in the generation of toxic gases such as purple smoke and white smoke. There were also problems such as tar adhesion inside the vaporizing section 3, which shortened the life of the equipment. The present invention solves these conventional problems, and is a safe system that detects disconnection in a short time and determines that there is a heating failure when the temperature drops below the level required to generate sufficient vaporized kerosene for good combustion. The purpose is to provide temperature control of the vaporizer cylinder that can control the equipment status. Means for Solving the Problems In order to solve the above problems, an oil combustion machine of the present invention includes a vaporizing section that vaporizes liquid fuel, a vaporizing section heating means that heats the vaporizing section, and a temperature detection of the vaporizing section. and a vaporizing section temperature detecting means to detect when the vaporizing section is heated, using a first temperature at which it is determined that heating of the vaporizing section is defective and a second temperature lower than the first temperature, and a second temperature that is lower than the first temperature. If the temperature does not rise to the second temperature within a predetermined period of time after heating is started by the vaporizing section heating means from below the temperature, an abnormality process is performed to stop the vaporizing section heating means, and once the temperature rises to the first temperature, From then on,
The device includes a control unit that performs an abnormality process of stopping the vaporizing section heating means when the temperature falls below a first temperature.

Effect of the present invention With the above-described configuration, when the vaporizing section is heated from room temperature, the second temperature, which is only for the purpose of detecting disconnection, is set to the temperature at which an abnormality process is performed to stop the vaporizing section heating means. In addition to being able to quickly detect wiring errors in the vaporizing section temperature detection means and element failures due to shortened service life, the detection time for disconnection is also short, so even if the vaporizing section is heated in a disconnected state. Even if the user continuously cancels the abnormal state in order to perform abnormality processing after detecting a disconnection in a short time, the continuous heating time of the vaporization section is short, so the risk of thermal melting of the vaporization section can be reduced.

Furthermore, once the temperature of the vaporizing section rises to the second temperature, the first temperature is increased to a temperature higher than the second temperature and sufficient to generate sufficient vaporized kerosene for good combustion. Since the temperature is set to perform abnormality processing to stop the heating means, poor vaporization in the combustion state can be immediately detected and a good combustion state can always be provided.

EXAMPLE Hereinafter, an oil burner according to an example of the present invention will be explained based on the accompanying drawings.

Figure 1 is a Bronnock diagram of the present invention, showing a part of the entire oil-burning machine. Reference numeral 3 denotes a vaporization section, and 15 indicates a vaporization section heating means for heating the vaporization section, which corresponds to the heater 4. 16 is the vaporization section 3
This is a vaporizing section temperature detection means for detecting the temperature of the vaporizing section thermistor 5, and corresponds to the vaporizing section thermistor 5. ■7 is a control section that detects a first temperature that is sufficient to generate enough vaporized kerosene for good combustion, and a second temperature that is lower than the first temperature from the vaporizing section temperature detection means 16. By monitoring and comparing the obtained temperature of the vaporizing section 3, a disconnection of the vaporizing section temperature detection means 16 or a failure of the vaporizing section heating means 15 can be detected. Means 1
Start and stop step 5.

Fig. 2 is a simplified circuit diagram of one embodiment of the present invention, which describes the parts related to the present invention in the entire oil combustion machine circuit, and Fig. 3 shows the temperature of the vaporizing section in the same example. Control of failure detection in the vaporizing section will be explained using graphs of normal and abnormal conditions with reference to FIGS. 2 and 3.

9 is the operation switch, 18 is RAM-ROM・A/
A so-called one-chip microcomputer (hereinafter referred to as a microcomputer) having a D-board, 19, 25, and 28 are transistors, 23 and 29 are comparators, 20a and 20b are relays that energize the heater 4, 4 is a heater, and 5 is a thermistor. , 34 is AC power supply, 2l, 22, 24, 25, 26,
27, 30, 3l, 32, and 33 are resistors, 15 is a vaporizer heating means consisting of a heater 4, relays 20a-b, and an AC power source 34, 16 is a thermistor 5, a comparator 29, a transistor 28, and resistors 25, 26, and 33. This is a vaporizing section temperature detection means consisting of 27 and 30.

First, when the power SW9 is turned on, the microcomputer I8 forcibly turns on the transistor l9 for a predetermined period of time, and then turns on the relay coil 2.
0a is excited, the heater 4 is energized, and the vaporization section 3 is heated.

After a predetermined period of time has elapsed, the microcomputer 18 turns off the transistor l9.
At the same time, the comparator 29 compares the temperature of the vaporizing section 3 represented by the divided voltage of the thermistor 5 and the resistor 30 with the second temperature represented by the divided voltage of the resistors 25 and 26. If the temperature of the vaporizing section 3 is higher than the second temperature, the transistor 28 is turned on and the comparator is switched on to switch the temperature to be compared with the vaporizing section 3 temperature as normal to the first temperature which is the vaporization failure detection temperature. Reduce the non-inverting input voltage of 29. Thereafter, the temperature of the vaporization section 3 will be monitored at a temperature equal to or higher than the first temperature. The comparator 23 is for controlling the temperature of the vaporizing section 3, and the divided voltage of the thermistor 5 and the resistor 30, which is the temperature of the vaporizing section 3, is the base I1! of the vaporizing section 3, which is the divided voltage of the resistors 21 and 22. If the temperature of the vaporizing section 3 is lower than the temperature, the transistor 25 is turned on to drive the relay 20 and the heater 4 is energized to control the temperature of the vaporizing section 3 to be constant. 24 is an output differential resistor of the comparator 23. (The above is normal state in Fig. 3 (a)) If the thermistor 5 is incorrectly connected or disconnected, the divided voltage between the thermistor 5 and the resistor 30 will change even if the heater 4 is energized for a predetermined period of time after the operation switch is turned on. Therefore, after a predetermined period of time has elapsed, the temperature is compared with the second temperature represented by the divided voltage of the resistors 25 and 26, and the comparator 29 detects the disconnection and forcibly turns off the transistor 25. (The above is shown in Figure 3.
) At the time of disconnection) If the operation switch ○N is used to energize the heater 4 for a predetermined period of time, and the temperature of the vaporization section is higher than the second temperature, the comparison temperature of the vaporization section is set to the first temperature, which is the vaporization failure detection temperature. The non-inverting input voltage of the comparator 29 is reduced by turning on the transistor 28 to switch to
If the divided voltage of the resistor 30 exceeds the combined resistance of the resistors 26 and 27 and the divided voltage of the resistor 25, which is the vaporization defect detection temperature, it is assumed that a vaporization defect has occurred, and the transistor 25 is turned off by the comparator 29. The relay 20 is turned off by
It performs abnormality processing that causes F. (The above is Figure 3 (
C) At the time of poor vaporization) Effects of the Invention As described above, the oil burner of the present invention provides the following effects.

Two fault detection levels are used in the vaporizing section, and a second vaporization temperature lower than the temperature sufficient to generate enough vaporized kerosene for good combustion is used to detect a break in the wire. Since the temperature is set to perform abnormality processing to stop the section heating means, it is possible to shorten the time for detecting a wire breakage, and when there is no wire breakage, the temperature at which abnormality processing is performed is set to the temperature at which sufficient vaporized kerosene is generated for good combustion. Because the temperature is maintained at just the same temperature, there is no longer a problem with conventional oil-burning machines, such as continuing combustion in a state of insufficient vaporization, and this has a significant effect in shortening failure detection time and improving safety. Obtainable.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an oil-burning machine showing an embodiment of the present invention, Fig. 2 is a circuit diagram of the oil-burning machine, Fig. 3 is a temperature characteristic diagram of the oil-burning machine, and Fig. 4 is a conventional example. Fig. 5 is a block diagram of the oil-burning machine. 3... Vaporizing section, 15... Vaporizing section heating means, 16... Vaporizing section temperature detecting means, 17...
...control section.

Claims (1)

[Claims] In an oil combustion machine having a vaporizing section that vaporizes liquid fuel such as oil, a vaporizing section heating means that heats the vaporizing section, and a vaporizing section temperature detecting means that detects the temperature of the vaporizing section, heating of the vaporizing section At this time, using the first temperature at which it is determined that the heating of the vaporization section is insufficient and a second temperature lower than the first temperature, after the vaporization section heating means starts heating from the temperature of the vaporization section below the second temperature, If the temperature does not rise to the second temperature within a predetermined time, abnormal processing is performed to stop the vaporizer heating means, and once the temperature rises to the first temperature, if the temperature falls below the first temperature, the vaporizer An oil-burning machine consisting of a control section that handles abnormalities by stopping the heating means.