JPH0626643A - Vaporization type combustion device - Google Patents

Abstract

PURPOSE:To suitably control the preheating of a vaporizer by controlling the preheating temperature of the vaporizer in a corresponding time zone according to a value stored in a storage area of a memory. CONSTITUTION:When an operation switch 17 is turned ON to start combustion, a predetermined value is added to a storage area in a time zone, to which a memory ME corresponds, according to the counting time of a 24-hour timer TM and, at the same time, a value smaller than the predetermined value is added to the storage areas in the preceding and succeeding time zones of the corresponding time zone. Accordingly, a value in a storage area in a time zone where combustion is frequently started becomes greater. Besides, values which are great to some degree are also stored in the storage areas in the preceding and succeeding time zones of the time zone. Consequently, in the time zone where combustion is frequently started, a preheating temperature of a vaporizer is sufficiently elevated and, even in the preceding and succeeding time zones of the time zone, the preheating temperature of the vaporizer is elevated to some degree.

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 device for performing a burning operation by vaporizing kerosene in a vaporizer.

[0002]

2. Description of the Related Art In this type of combustion device, it is necessary to raise the temperature of the carburetor to a temperature suitable for combustion at the start of combustion operation. If the temperature of the carburetor before combustion is too low, the temperature of the carburetor will burn. It takes a long time to rise to a temperature suitable for, and the start of the combustion operation is delayed. For this reason, it is necessary to raise the temperature of the carburetor to some extent before the start of combustion and to smoothly raise the temperature of the carburetor to a temperature suitable for combustion when the combustion operation is started. However, if the vaporizer is preheated to a relatively high temperature state all day long, useless power consumption increases.

Therefore, conventionally, for example, 24 hours a day are divided into time zones of 2 hours, and when the combustion operation is started, it is determined which time zone it belongs to from the time when the combustion operation is started, and the corresponding time zone is set. It is known that a corresponding counter is used to count the number of times combustion operation is started and the preheat temperature of the carburetor is changed according to the magnitude of the count value in each time zone. That is, it is shown that the probability that the combustion operation is started is high in the time zone where the number of combustion operation starts is large, and the preheating temperature of the carburetor is sufficiently raised in this time zone, In the zone, the preheat temperature of the carburetor is lowered to minimize unnecessary power consumption.

[0004]

In such a conventional apparatus, when the combustion operation is started three times around 1:55, as shown in FIG. 5, the time is from 0:00 to 2:00. The count value of the corresponding counter is "3", and the count value of the counter corresponding to the other time zones is "0". By the way, since it is around 1:55, there is a high possibility that the combustion operation will start after 2:00. However, since the count value of the counter corresponding to the time zone from 2:00 to 4:00 is "0", the preheating temperature of the carburetor during this time zone can be suppressed low. In this way, in the conventional device, the preheat temperature of the carburetor can be kept low even during the time period when the combustion operation is likely to start, so when the combustion operation is started during this time period, the carburetor is burned. It takes time to raise the temperature to a temperature suitable for the above, and the start of the combustion operation is delayed. Therefore, the present invention is intended to provide a vaporization type combustion device capable of more appropriately determining the probability of the time zone in which the combustion operation is started and performing appropriate preheat control of the vaporizer.

[0005]

According to the present invention, a carburetor heater for heating a carburetor is provided, and the carburetor heater is used to preheat the carburetor to a temperature lower than a temperature suitable for combustion before starting combustion. In a vaporization-type combustion device in which a vaporizer heater starts a vaporizer to a temperature suitable for combustion to start a combustion operation, a timer for counting 24 hours,
A memory having a storage area corresponding to a predetermined time zone of time, and when combustion is started, a predetermined value is added to the storage area of the corresponding time zone of the memory according to the count time of the timer. Addition means for adding a value smaller than the above predetermined value to the storage area of the time zone before and after the corresponding time zone, and the carburetor of the vaporizer in the corresponding time zone according to the value stored in each storage area of the memory. A preheating temperature setting means for setting the preheating temperature is provided, and the preheating temperature setting means sets the preheating temperature higher as the value stored in the storage area is larger.

[0006]

In the present invention having such a configuration, when combustion is started, a predetermined value is added to the storage area of the corresponding time zone of the memory according to the count time of the timer, and the corresponding time zone is also added. A value smaller than the predetermined value is added to the storage area in the time zones before and after. Therefore, the value of the storage area becomes large during the time when the number of combustion starts is large. In addition, a value of a certain size is also stored in the storage areas of time zones before and after that time zone. Therefore, not only the preheating temperature of the carburetor is sufficiently raised in the time zone in which the number of combustion starts is large, but also the preheating temperature of the carburetor is raised to some extent in the time zones before and after the time zone.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the commercial AC power supply 1 has a first
The carburetor heater 3 for heating the carburetor is connected via the normally open contact 2m of the relay 2, and the full wave rectification is performed via 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. The normally open contact 5m of the third relay 5 has a resistor 7
Are connected in parallel. Between the rectification output terminals of the full-wave rectification diode bridge circuit 6, a solenoid valve 8 provided in a passage for supplying vaporized gas from the vaporizer to the burner is connected.

Further, the ignition heater 10 is connected to the power source 1 via the normally open contact 9m of the fourth relay 9, and the normally open contact 11m of the fifth relay 11 and the photothyristor 12 are connected in series to the convection blower motor 13. 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 the first, second, third and fourth relays 2, 4 are connected via a switch 18 which operates in conjunction with the operation switch 17. , 5, 9 are connected. Further, a light emitting diode 19 for controlling conduction of the fifth relay 11 and the photothyristor 12 is connected. Further, the operation lamp 20, the thermistor 2 for detecting the temperature of the carburetor.
1. The electromagnetic pumps 22 for supplying kerosene from the kerosene tank to the vaporizer are respectively connected. As shown in FIG. 2, the control circuit 16 includes a one-chip microcomputer 2
3 is provided.

The microcomputer 23 is connected to a DC power supply VCC. Further, a series circuit of the operation switch 17 and the resistor 24 and a series circuit of the thermistor 21 and the resistor 25 are connected to the DC power supply VCC.

A of the microcomputer 23
The connection point between the operation switch 17 and the resistor 24 and the connection point between the thermistor 21 and the resistor 25 are connected to the input terminals I0 and K0 having the / D conversion function, respectively. A series circuit of the operation lamp 20 and the resistor 26 is connected between the positive terminal of the DC power source Vcc and the output terminal O0 of the microcomputer 23.

The output terminals O1, O2, O3, O4 and O5 of the microcomputer 23 are connected to the driver 27,
28, 29, 30, 31 are connected to the input terminals, respectively. The first, second, third, and third electrodes 27, 28, 29, 30 are connected between the positive terminal of the DC power source VP (> Vcc) and the output terminals of the drivers 27, 28, 29, 30 via the switch 18.
The fourth relays 2, 4, 5, 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 31.

The microcomputer 23 has two internal components.
4-hour timer TM, operation flag F1, preheat flag F2 and a predetermined time zone of 24 hours, for example, 0 to 2 o'clock,
2-4, 4-6, 6-8, 8-10, 12-1
4 o'clock, 14-16 o'clock, 16-18 o'clock, 18-20 o'clock, 2
A memory ME having a storage area corresponding to 0 to 22:00 and 22 to 24 (0:00) is provided. The microcomputer 23 is adapted to perform control based on a program based on the flow chart shown in FIG.

First, in S1, the 24-hour timer TM is counted up. Then, the operation switch 17 is turned on at S2.
If it is OFF, the preheat flag F2 and the operation flag F1 are set to "0" to perform the digestion control.

Then, in S3, the preheating temperature T is calculated based on the value of the storage area in the corresponding time zone of the memory ME. The preheating temperature T is calculated by the equation T = T0 + Nt.
In addition, T0 is the initial value of the preheating temperature, N is the value of the storage area,
t is a constant. An upper limit value TMAX is set for the preheating temperature T, so that the temperature does not exceed the upper limit value TMAX.

Next, in S4, it is checked whether the carburetor temperature detected by the thermistor 21 is T or higher. If it is T or higher, the carburetor heater 3 is turned off. If it is lower than T, the carburetor heater 3 is turned on. ON control. Then, the process returns to counting up the 24-hour timer TM of S1.

Further, the operation switch 17 of S2 is turned ON and OF
If the F check is ON, then in S5, it is checked whether the operation flag F1 is "1". If the operation flag F1 is "0", the operation flag F1 is set to "1" and 1 is added to the storage area of the memory ME in the corresponding time zone. Also, 1/2 is added to the storage areas of the time zones before and after the relevant time zone. If the operation flag F1 is "1", the above addition processing is not performed.

Subsequently, in S6, it is checked whether or not the preheat flag F2 is "1". If the preheat flag F2 is "0", preheat control is performed. Then, before the completion of preheating, the process returns to the count-up of the 24-hour timer TM of S1. When the temperature of the vaporizer rises to a temperature suitable for combustion and preheating is completed, the preheating flag F2 is set to "1" and combustion control is started. If the preheat flag F2 is "1" at S6, combustion control is performed.

In the embodiment having such a structure, the 24-hour timer TM is counted up at a predetermined cycle. When the operation switch 17 is turned on to start the combustion operation, 1 is set in the storage area of the corresponding time zone of the memory ME based on the count time of the 24-hour timer TM.
Is added, and 1/2 is added to the storage areas of the time zones before and after the relevant time zone.

The normally open contact 2m of the first relay 2 is turned on.
Then, the power supply to the carburetor heater 3 is started and the preheating control is performed. When the carburetor temperature rises to a temperature suitable for combustion, preheating is completed, the preheating flag F2 is set to "1", and combustion control is started.

In this combustion control, the normally open contacts 4m, 5m of the second and third relays 4, 5 are turned on to open the solenoid valve 8, and the electromagnetic pump 22 is operated to turn kerosene into a carburetor. Supplied. As a result, kerosene is vaporized in the vaporizer, and the vaporized gas is mixed with air and sent to the burner.

On the other hand, the normally open contact 9m of the fourth relay 9 is turned on for a certain period of time to activate the ignition heater 10. As a result, the mixed gas is ignited by the ignition heater 10 in the burner to start the combustion operation.

When the temperature of the heat exchange section becomes sufficiently high due to the heating of the combustion section, the normally open contact 11m of the fifth relay 11
Is turned on, and the convection blower motor 13 starts operating.
In this way, the air sent by the blower is converted into warm air in the heat exchange section and is discharged. Thus, warm air heating is started.

The combustion operation is stopped when the operation switch 17 is off. 24 in this state
Based on the count time of the time timer TM, the value N of the storage area in the corresponding time zone of the memory ME is read, and T =
The preheating temperature T at that time is calculated from T0 + Nt,
Based on the calculated preheating temperature T, preheating control of the carburetor is performed.

For example, in the time zone of 0 to 2 o'clock, the past 3
If the combustion start operation is performed twice, the values of the memory area in the corresponding time zone of the memory ME and the memory areas in the time zones before and after the time zone are 22 to 24 o'clock (0
Hour) is “1.5”, 0 to 2 o'clock is “3”, and 2 to 4 o'clock is “1.5”. Therefore, at 0 to 2 o'clock, the preheating temperature T becomes a relatively high temperature of T = T0 + 3t. Therefore, the temperature of the carburetor is raised to a relatively high temperature in this time zone when the combustion start operation is most likely to occur. The temperature will rise to a temperature suitable for combustion. That is, the rise of the combustion operation becomes faster.

Also, the time zone before and after 22:00 to 24:00 and 2
At about 4 o'clock, the preheating temperature T is maintained at T = T0 + 1.5t, which is 1.5t higher than the initial value T0. Therefore, in this time zone, the temperature of the carburetor is raised to a certain temperature, and if the combustion start operation is performed in this time zone, the carburetor will rise to a temperature suitable for combustion in a relatively short time. .

Therefore, the last three combustion start operations are 1:55.
Even if the combustion start operation of this time is performed around 2 minutes, the carburetor is lower than the time zone of 0 to 2 o'clock but is lower than the preheating temperature T 0 of the time zone of 4 to 2 o'clock. Since it is preheated at a high temperature, a relatively smooth start-up of combustion operation will be performed.

In this way, the preheating temperature T of the carburetor can be increased in the time zone in which the combustion start operation is most likely to occur, and the preheat temperature T of the carburetor can be maintained in the time zones before and after the probability is relatively high. It can be increased to some extent, and proper preheating control of the vaporizer can be performed.

[0030]

As described in detail above, according to the present invention, there is provided a vaporization type combustion device capable of more appropriately determining the probability of the time zone in which the combustion operation is started and controlling the preheating of the vaporizer appropriately. It is possible.

[Brief description of drawings]

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

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

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

FIG. 4 is a diagram showing an example of an added value of a storage area in the same embodiment.

FIG. 5 is a diagram showing an example of an added value of a conventional storage area.

[Explanation of symbols]

3 ... Vaporizer heater, 17 ... Operation switch, 31 ... One-chip microcomputer, TM ... 24-hour timer, M
E ... memory.

Claims (1)

[Claims] 1. A vaporizer heater for heating the vaporizer is provided,
Prior to the start of combustion, the carburetor heater preheats the carburetor to a temperature lower than a temperature suitable for combustion, and at the start of combustion, the carburetor heater heats the carburetor to a temperature suitable for combustion and performs a combustion operation. In the vaporization type combustion apparatus for starting the above, a timer for counting 24 hours, a memory having a storage area corresponding to a predetermined time zone of 24 hours, and a count time of the timer when combustion is started Accordingly, an addition means for adding a predetermined value to the storage area of the corresponding time zone of the memory and adding a value smaller than the predetermined value to the storage area of the time zone before and after the corresponding time zone; And preheating temperature setting means for setting the preheating temperature of the carburetor in the corresponding time zone according to the value stored in each storage area,
The vaporization type combustion device, wherein the preheating temperature setting means sets the preheating temperature higher as the value stored in the storage area is larger.