JPH0484017A - Kerosene vaporization type burner - Google Patents

Abstract

PURPOSE:To carry out effectively tar removal according to the conditions of use by providing a dry burning operation changing device which changes the time to operate dry burning according to the conditions of use. CONSTITUTION:The dry burning operation is carried out by heating a carburetor 5 by a heater 6 through a control section 30 to a high temperature which is fairly higher than the temperature at the time of the ordinary combustion operation and by discharging the tar vaporized in the carburetor 5 from a nozzle 10 by dry operation of an electromagnetic pump 8. As for the time to carry out the dry burning operation it takes the accumulated value of the combustion times as a condition, and the dry burning operation is made at a set time in the combustion time. As for the set combustion time that specifies the time of dry burning operation a number of values are beforehand stored in the microcomputer of the control section 30 and at the same time the set combustion time is switched by an external switch 31. Since it is possible to change the time of dry burning operation, it can be made according to the conditions of use even if they are different, and the tar removal can be, therefore, made at a suitable time and effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an oil vaporization type combustor in which the vaporizer can be operated in a dry firing mode in order to remove tar. Such a combustor can be used as a water heater or a heating device.

<Prior art and its problems> As a method of automatically dry-firing the carburetor at regular intervals, there is a method in which the burner combustion time is counted and the dry-firing is performed when a certain cumulative time has been reached; There is a method of counting the number of times and performing dry firing when a certain cumulative number of times is reached.

However, in the above-mentioned products that perform dry firing every certain combustion time or every certain number of combustion times, the time required to perform dry firing operation varies greatly depending on the actual usage conditions, which may hinder the removal of tar. I found out that it was happening. In other words, for example, if it takes one month to burn for 100 hours and if it takes three months, the amount of tar deposited is about the same, but when dry firing is performed in the third month, the amount of tar is This means that it will not be possible to remove them sufficiently.

Therefore, the present invention aims to eliminate the drawbacks of the conventional technology in which the dry firing timing is determined by a fixed number of combustion times or combustion time, and to provide an oil vaporization type combustor that can effectively remove tar content depending on the usage situation. shall be.

<Means for Solving the Problems> In order to achieve the above object, the oil vaporization type combustor of the present invention vaporizes oil in a vaporizer, sends it to a burner to perform a combustion operation, and also The oil vaporization type combustor capable of dry firing operation is characterized in that it is provided with a dry firing operation timing changing means that can change the timing of dry firing operation according to usage conditions. The dry firing operation timing changing means includes a set combustion time (number of times) changeover switch for changing the set combustion time (number of times) until the start of dry firing, and a set combustion time (number of times) that is stored in the microcomputer of the control section for determination. ) may be changed, or a combustion time (number of times) setting device may be provided to input a predetermined set combustion time to the microcomputer. Alternatively, the burning time per day may be automatically detected and the set burning time (number of times) may be automatically selected.

<Operation> According to the above feature, by changing the dry firing operation timing by the dry firing operation timing changing means, it is possible to obtain the dry firing operation timing according to the usage situation. Therefore, dry firing can be performed at a time when tar content can be effectively removed.

<Embodiment> FIG. 1 is an overall configuration diagram of an embodiment of the present invention, and FIGS. 2 and 3 are flowcharts each illustrating how to set the dry firing time.

A burner 2 is provided in a case 1 of the water heater, a blower fan 3 is provided in the lower part, and a heat exchange part 4 for hot water supply is provided in the upper part of the case 1.

The vaporizer 5 is equipped with a heater 6 and an oil tank 7.
from the carburetor 5 through an oil supply pipe 9 by an electromagnetic pump 8.
The petroleum sent there is vaporized into gas and sent to the burner 2 through the nozzle 10. The nozzle 10 is opened and closed by a needle valve 12 which is moved forward and backward by a solenoid 11. As the combustion is repeated, tar adheres and accumulates inside the carburetor 5 and the nozzle 10, causing poor vaporization and combustion. In addition, 13 is a return pipe for reliquefied oil,
14 is an igniter, and 15 is a water flow switch. The device is controlled by a remote control 20 and a control unit 3 with a built-in microcomputer.
This is done by 0.

In operation of the device, the operation switch 21 of the remote controller 20 is pressed to turn on the switch, turn on the heater 6 via the control unit 30, and start preheating the vaporizer 5 by the heater 6. This preheating is a standby operation that allows the oil to vaporize smoothly without any delay when combustion actually starts. Preheating continues as long as the operation switch is on, regardless of whether combustion is occurring or not. It will be done.

Combustion occurs when the user opens a tap (not shown).
This is performed by inputting a combustion start signal from the water flow switch 15 to the control unit 30 when water starts flowing in at a flow rate higher than a certain level. Therefore, this water flow switch 15 becomes a switch for combustion operation. In response to a control signal from the control unit 30, the blower fan 3 and the electromagnetic pump 8 start driving, and the solenoid 11 moves back the needle valve 12 and closes the nozzle 10.
open. Then, the igniter 14 is activated, and the gas vaporized by the vaporizer 5 and sent to the burner 2 is ignited, and combustion is started. When the hot water supply valve is closed, a combustion stop signal is sent from the water flow switch 15 to the control unit 30, and combustion is stopped.

On the other hand, during dry firing operation, the control unit 30 controls the vaporizer 5 to be heated to a considerably higher temperature (40°C) than during normal combustion operation by using the heater 6.
0°C or higher), and the electromagnetic pump 8 is operated in a dry run (
This is done by sending only air without pumping up oil) and discharging the tar vaporized in the vaporizer 5 from the nozzle 10.

Regarding the timing to perform the dry firing operation, the integrated value of the combustion time is used as a condition, and the dry firing operation is performed when the set combustion time is reached. Regarding the set combustion time that determines the dry firing operation timing, several values are set in advance by the control unit 30.
The preset combustion time is stored in the microcomputer, and the preset combustion time is switched using an external changeover switch 31.

The changeover switch 31 may be provided on the remote control 20 side.

For example, as shown in FIG. 2, 50 hours and 100 hours are stored in advance in the microcomputer of the control unit 30 as set combustion times, and when the selector switch 31 is turned on, the set combustion time of 50 hours is set as the reference value for judgment (comparison). value), and 100 hours with the switch off is used for determination. In this case, the user or the installer takes into consideration the frequency of use of the combustor and sets the changeover switch 31 to ON or OFF. The combustion time can be accumulated by using a counter in the control unit 30 to accumulate the detection signal time from a flame detector (not shown). Then, this integrated value is compared with the reference value for determination in the microcomputer, and when the reference value is reached, it is determined that the dry firing operation condition is met.

In the above example, an example was explained in which the changeover switch is manually operated, but the reference value for determining the dry firing operation may be automatically changed depending on the usage situation. FIG. 3 shows an example. That is, a timer built into the control unit 30 is used to sample the combustion time within a certain period of time at a certain time, and the control unit 30 calculates the combustion time per day from this sample, and as a result, for example, the average combustion time per day is calculated. If the time is less than 1 hour, the program is configured in advance so that 50 hours stored in the microcomputer is selected as the reference value for determination, and if it is more than 1 hour, 100 hours is selected as the reference value for determination.

In the above, the burner combustion time is used as a reference value for determining the timing condition for dry firing, and this reference value is configured to be switchable, but of course it is also possible to determine the number of combustions instead of the combustion time. adopted as a reference value for
The reference value of the number of combustions may be changed. When using the number of combustions, the number of combustions can be integrated using a detection signal from a flame detector (not shown) of the burner 2.

Alternatively, a combustion time (or number of times) setting device may be provided, and the determination reference value may be directly input into the microcomputer using the setting device. In this case, the user or the installer takes into consideration the usage status of the combustor and manually inputs an appropriate criterion value.

Effects> The present invention has the above-described configuration, and according to the oil vaporization type combustor according to claim 1, the dry firing operation timing changing means:
Since the dry firing time can be changed, dry firing can be performed according to the usage conditions even if the usage conditions are different. Therefore, the tar content can be effectively removed at the appropriate time, and there is no possibility that the number of dry firings will be too small and tar content cannot be removed, or that the number of dry firings will be too many and the durability of the parts will deteriorate. It can be resolved.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of an apparatus implementing the present invention, and FIGS. 2 and 3 are flowcharts each illustrating how to set the dry firing timing. 2: Burner 5: Vaporizer 6: Heater 8: Magnetic pump 10: Nozzle 20: Remote control 30: Control unit 31: Selector switch

Claims (1)

[Claims] (1) In an oil vaporization type combustor that can vaporize oil in a vaporizer, send it to a burner to perform combustion operation, and also perform dry firing operation of the vaporizer, depending on the usage situation, dry burning is possible. An oil vaporization type combustor characterized in that it is provided with means for changing the dry firing operation timing that can change the operation timing.