JPH04281110A - Vaporization type burner - Google Patents

Abstract

PURPOSE:To prevent the waste of electric power by stopping the preheating of the carburetor when operation is made by a timer even if a preheating switch is thrown in. CONSTITUTION:A preheating means which heats the carburetor to an arbitrary temperature that is lower than the temperature suitable for combustion by energizing a carburetor heater 3 before starting operation and a preheating switch 21 for starting the preheating action by the preheating means are provided. And a display device 24 which displays that the preheating is being made by the preheating means and a timer movement means which starts operation by timer movement are provided. Further, the preheating operation by the preheating means is stopped when the timer movement is started by the timer movement means in the state that the preheating operation is made by the preheating means, and at the same time a controller 16 that holds the state of preheating operation display in the display device 24 is provided.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vaporization type combustion apparatus equipped with a vaporizer for vaporizing liquid fuel.

0002

[Prior Art] In this type of combustion device, when combustion operation is started, electricity is first started to be supplied to the vaporizer heater to preheat the vaporizer, and when the vaporizer temperature rises to a temperature suitable for combustion, the vaporizer is heated. A liquid fuel such as kerosene is supplied to the combustion chamber, and the kerosene is vaporized in a vaporizer and mixed with air to become combustion gas, which is ignited in a combustion chamber to start combustion.

By the way, it is desirable for those who use a combustion device to start the combustion operation immediately when they turn on the operation switch, but because of preheating, they have to wait for a while until the combustion operation starts. . Therefore, a pre-heating switch is provided, and by turning on this switch, the vaporizer is maintained at a certain temperature, although lower than the temperature suitable for combustion, and combustion operation starts after the operation switch is turned on. There are known methods that shorten the preheating period. Conventionally, even when operating on a timer, when the preheating switch is turned on, the vaporizer is maintained at a certain temperature by preheating.

0004

[Problem to be Solved by the Invention] By the way, in the case of timer operation, combustion operation is normally started automatically without human intervention, so the preheating period is shortened and combustion operation is started in a short time after preheating starts. There is no need to start. However, in the conventional device, even when operating on a timer, when the preheating switch is turned on, the vaporizer is held at a certain temperature by preheating, so there is a problem in that power is wasted by the vaporizer heater. For this reason, when the timer operation is performed, it is sufficient to turn off the preheating switch, but it becomes troublesome to turn off the preheating switch every time the timer operation is performed, and there is also the problem of forgetting to turn it off.

Therefore, the present invention prevents wasteful power consumption by stopping the preheating of the vaporizer even if the preheating switch is in the on state when performing timer operation, and also provides a display that displays the preheating operation. It is an object of the present invention to provide a vaporization type combustion device in which the relationship between the on state of the preheating switch and the display can be maintained normally by leaving the preheating display as it is, and the user does not feel discomfort.

[0006]

[Means for Solving the Problems] The present invention includes a vaporizer heater for heating a vaporizer, a preheating means for heating the vaporizer to a temperature suitable for combustion by energizing the vaporizer heater at the start of operation, a pre-heating means for heating the vaporizer to an arbitrary temperature lower than a temperature suitable for combustion by energizing the vaporizer heater before starting operation; and a pre-heating switch for starting a pre-heating operation by the pre-heating means. , an indicator that displays that the preheating operation is being performed by the preheating means; a timer operation means that causes the start of operation to be performed by a timer operation; and a timer operation means that the preheating operation is performed by the preheating means. The control means is provided for stopping the preheating operation by the preheating means when the timer operation by the means is started, and for causing the display to maintain the preheating operation display state.

[0007]

[Operation] In the present invention having such a configuration, when the preheating switch is turned on before starting operation, the preheating means energizes the vaporizer heater, and the vaporizer is heated to an arbitrary temperature lower than the temperature suitable for combustion. heated up to. Further, the preheating operation status is displayed on the display. In this state, when the timer operation means starts the timer operation, the preheating operation by the preheating means is stopped. However, the display state of the preheating operation on the display is maintained.

[0008]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a commercial AC power supply 1 has a first
The carburetor heater 3 that heats the carburetor is connected through the normally open contact 2m of the relay 2, and full-wave rectification is performed through the normally open contact 4m of the second relay 4 and the normally open contact 5m of the third relay 5 in series. The AC input terminal of the diode bridge circuit 6 is connected. A resistor 7 is connected to the normally open contact 5m of the third relay 5.
are connected in parallel. A solenoid valve 8 provided in a passage for supplying vaporized gas from a vaporizer to a burner is connected between the rectified output terminals of the full-wave rectifying diode bridge circuit 6.

Further, an ignition heater 10 is connected to the power source 1 through a normally open contact 9m of a fourth relay 9, and a convection blower motor 13 is connected through a normally open contact 11m of a fifth relay 11 and a photothyristor 12 in series. are connected. A resistor 14 is connected in parallel to the photothyristor 12. Further, a control circuit 16 is connected to the power source 1.

An operation switch 17 is connected to the control circuit 16, and each of the first, second, third, and fourth relays 2, 4 is connected via a switch 18 that operates in conjunction with the operation switch 17. , 5, and 9 are connected. Further, a light emitting diode 19 for controlling conduction of the fifth relay 11 and the photothyristor 12 is connected. Also, a timer switch 20, a pre-heating switch 21, an operation lamp 22
, a timer lamp 23, a preheating lamp 24 serving as an indicator,
A thermistor 25 for detecting the temperature of the vaporizer, and an electromagnetic pump 26 for supplying kerosene from the kerosene tank to the vaporizer are connected, respectively. A one-chip microcomputer 31 is provided within the control circuit 16, as shown in FIG.

The microcomputer 31 is connected to a DC power supply VCC. Further, the DC power supply VCC includes a series circuit of the operation switch 17 and the resistor 32, a series circuit of the timer switch 20 and the resistor 33, a series circuit of the preheating switch 21 and the resistor 34, and a series circuit of the thermistor 25 and the resistor 35. The series circuits are connected to each other. The A/D conversion function input terminals I0, I1, I2, and K0 of the microcomputer 31 are connected to the connection point between the operation switch 17 and the resistor 32, the connection point between the timer switch 20 and the resistor 33, and the preheating switch. 2
1 and resistor 34, the thermistor 25 and resistor 3
The connection points with 5 are connected respectively.

Furthermore, the positive terminal of the DC power supply Vcc and the output terminals O0, O1, O2 of the microcomputer 31
a series circuit of the operating lamp 22 and a resistor 36 between;
A series circuit of the timer lamp 23 and the resistor 37 and a series circuit of the preheating lamp 24 and the resistor 38 are connected, respectively.

Further, output terminals O3, O4, O5, O6, and O7 of the microcomputer 31 are connected to input terminals of drivers 39, 40, 41, 42, and 43, respectively. The first, second, third, and fourth relays are connected via the switch 18 between the positive terminal of the DC power supply VP (>Vcc) and the output terminal of each of the drivers 39, 40, 41, and 42. 2, 4, 5, and 9 are connected to each other, and the fifth relay 11 is connected between the positive terminal of the DC power source VP and the output terminal of the driver 43. The microcomputer 31 is configured to perform the control shown in the flow charts shown in FIGS. 3 and 4 based on a program.

First, at S1, the preheating switch 21 is turned on.
If it is OFF, the pre-heating flag (F
) to "0" and proceed to the ON check of the operation switch 17 in S2. If it is ON, then in S3 it is checked whether the preheating switch flag is "1" or not. If it is "1", the process moves to S2 to check whether the operation switch 17 is ON. If it is "0", the pre-heating switch flag is set to "1" and the pre-heating flag is checked in S4. Then, if the preheating flag is "1", the preheating flag is set to "0", the preheating lamp 24 is turned off, and S2
The process moves to an ON check of the operation switch 17. If the preheating flag is "0", the preheating flag is set to "1", the preheating lamp 24 is turned on, and the operation switch 1 of S2 is turned on.
Proceed to step 7 ON check.

If the operation switch 17 is ON in the ON check of the operation switch 17 in S2, then S5
Check the timer flag. If the timer flag is "1", the first relay 2 is turned off, the carburetor heater 3 is turned off, and the process moves to S6 to check whether the operation switch 17 is turned on. Further, if the timer flag is "0", the process directly advances to S6 to check whether the operation switch 17 is ON.

If the operation switch 17 is OFF in the ON check of the operation switch 17 in S2, then S7
Check the pre-heating flag. If the pre-heating flag is "0", the first relay 2 is turned off, the carburetor heater 3 is turned off, and the operation switch 17 of S6 is turned on.
Move to check. Further, if the preheating flag is "1", then in S8 it is checked whether the vaporizer temperature is equal to or higher than T, which is slightly lower than the temperature suitable for combustion. If the vaporizer temperature is equal to or higher than the temperature T, the first relay 2 is turned OFF, the vaporizer heater 3 is turned OFF, and the process moves to S6 to check whether the operation switch 17 is ON. Also, if the vaporizer temperature is less than temperature T, the first relay 2 is turned on and the vaporizer heater 3 is turned on.
Then, the process moves to the ON check of the operation switch 17 in step S6.

In the ON check of the operation switch 17 in S6, if the operation switch 17 is OFF, the combustion stop control is performed, the operation lamp 22 is OFF, and the timer lamp 23 is OFF.
FF is performed and the timer flag is set to "0". Then, the process returns to the ON check of the pre-heating switch 21 in S1.

Further, in the ON check of the operation switch 17 of S6, if the operation switch 17 is ON, then the S
At step 9, the timer switch 20 is checked to be ON. If the timer switch 20 is OFF, the timer switch flag is set to "0" and the process moves to the timer flag check in S10. Further, if the timer switch 20 is ON, the timer switch flag is subsequently checked in S11. If the timer switch flag is "1", the process moves to timer flag check in S10. Also, if the timer switch flag is "0", the timer switch flag is set to "1".
Then, in S12, the timer flag is checked. If the timer flag is "1", the timer flag is set to "0" and the process moves to the timer flag check in S10, and if the timer flag is "0", the timer flag is set to "1" and the process proceeds to S10.
Proceed to step 10, timer flag check.

If the timer flag is "1" in the timer flag check in S10, combustion stop control is performed, the operation lamp 22 is turned off, and the timer lamp 23 is turned on, and the timer time is counted. Then, in S13, it is checked whether the timer has timed out. Also, the timer flag is “
0”, the operation lamp 22 is turned on and the timer lamp 2 is turned on.
3 is turned OFF, and a preheating completion check is performed in S14.

If the timer has not timed up in the time-up check in S13, the process returns to S1 to check whether the preheating switch 21 is ON. Also, if the timer has timed up, set the timer flag to "0" and then S1
Return to the ON check of the pre-heating switch 21.

If preheating is not completed in the preheating completion check in S14, preheating control is performed and the process returns to S1 to check whether the preheating switch 21 is ON. Further, if the vaporizer temperature has reached a temperature suitable for combustion or higher and preheating has been completed, combustion control is performed and the process returns to the ON check of the preheating switch 21 in S1.

In the embodiment with such a configuration, when the preheating switch 21 is turned on during non-combustion, the preheating switch flag and the preheating flag each become "1" and the preheating lamp 24 lights up. And the preheating flag is "1"
Therefore, the vaporizer heater 3 is turned on until the vaporizer temperature becomes T or higher, and then turned off when the vaporizer temperature becomes T or higher to maintain the vaporizer temperature at approximately T. In this way, preheating of the vaporizer is performed, and the preheating lamp 24 indicates the state of the preheating.

When the operation switch 17 is turned on in this state, the operation lamp 22 lights up. Then, the vaporizer is preheated. At this time, since the vaporizer temperature has already been raised to temperature T by the preheating, the vaporizer is heated by the vaporizer heater 3 to rise to a temperature suitable for combustion in a short time. In this way, the combustion operation is started within a relatively short time after the operation switch 17 is turned on.

That is, when the operation switch 17 is turned on, the switch 18 is also turned on in conjunction. The microcomputer 31 receives the voltage at the connection point between the thermistor 25 and the resistor 35 from the input terminal K0, and detects the vaporizer temperature. When the vaporizer temperature rises to a temperature suitable for combustion, the electromagnetic pump 26 is operated to supply kerosene from the kerosene tank to the vaporizer. Then, a high level is output to the output terminals O4 and O5 to turn on the second and third relays 4 and 5. This causes the solenoid valve 8 to operate, and combustion gas, which is a mixture of vaporized gas and air, is supplied to the burner. Further, a high level is output to the output terminal O6 to turn on the fourth relay 9. This turns on the ignition heater and ignites the burner. In this way, the combustion operation is started. When the temperature of the combustion chamber becomes high, a high level is output to the output terminal O7 to turn on the fifth relay 11. This causes the blower motor 1
3 is activated and warm air is blown into the room.

[0026] Also, during non-combustion, the preheating switch 21
is turned on to preheat the vaporizer, and when the timer switch 20 and operation switch 17 are turned on for timer operation with the preheating lamp 24 lit, the timer switch flag and the timer flag are set to "1". Then, the timer lamp 23 is turned on. Since the timer flag is set to "1", the vaporizer heater 3 is controlled to be turned off. Preheating is thus stopped. However, the preheating lamp 24 remains lit without being turned off.

After that, when the timer expires, the operation lamp 22 is turned on, the timer lamp 23 is turned off, and preheating is started. When the vaporizer temperature eventually reaches a temperature suitable for combustion, combustion operation begins.

When the pre-heating control of the vaporizer is being performed in this way, when the timer operation is set, the vaporizer heater 3 is turned off and the pre-heating operation of the vaporizer is stopped. Therefore, wasteful power consumption by the vaporizer heater 3 is prevented. Further, since the preheating switch 21 is in the ON state and the preheating lamp 24 is also lit, the states of the preheating switch 21 and the preheating lamp 24 correspond to each other, and there is no possibility that the user will feel uncomfortable. Incidentally, although a lamp was used as the indicator in the above embodiment, it is needless to say that the indicator is not limited to this.

[0029]

As described in detail above, according to the present invention, wasteful power consumption can be prevented by stopping preheating of the vaporizer even if the preheating switch is in the ON state when performing timer operation. Moreover, by leaving the preheating display on the display that displays the preheating operation as it is, the relationship between the on state of the preheating switch and the display can be maintained normally, and it is possible to provide a vaporization combustion device that does not give the user a sense of discomfort. It is something.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram showing an embodiment of the present invention.

FIG. 2 is a circuit diagram showing the main part configuration of the control circuit of the same embodiment.

FIG. 3 is a flowchart showing control processing in the embodiment.

FIG. 4 is a flowchart showing control processing in the same embodiment.

[Explanation of symbols]

3... vaporizer heater, 17... operation switch, 20... timer switch, 21... pre-heating switch, 24... pre-heating lamp, 31... one-chip microcomputer.

Claims (1)

[Claims] 1. A vaporizer heater for heating a vaporizer; a preheating means for heating the vaporizer to a temperature suitable for combustion by energizing the vaporizer heater at the start of operation; a preheating means for heating the vaporizer to an arbitrary temperature lower than a temperature suitable for combustion by energizing the vaporizer heater; a preheating switch for starting a preheating operation by the preheating means; and a preheating switch for starting a preheating operation by the preheating means; an indicator for displaying that a preheating operation is being performed by the means; a timer operating means for causing the start of operation to be performed by a timer operation; and a timer operating means for displaying a state in which the preheating operation is being performed by the preheating means. 1. A vaporizing combustion apparatus, comprising: a control means for stopping a preheating operation by the preheating means and maintaining a preheating operation display state on the display when a timer operation is started.