JP2004183933A - Combustion apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion apparatus capable of shortening a time passed from the start of re-operation to the start of combustion , reducing the power consumption of an ignition heater, and increasing the durability of the ignition heater when an operation is re-started after temporarily stopping the operation during combustion operation. <P>SOLUTION: When the operation is re-started after temporarily stopping the operation during the combustion operation, the control part of the combustion apparatus reduces an energizing time for the ignition heater less than normal energizing time when an operation stop time timed by a timer means is shorter than the pre-set specified time. Thus, the time passed from the start of the re-operation to the start of the combustion can be reduced, the power consumption of the ignition heater can be reduced, and the durability of the ignition heater can be increased. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a combustion device for vaporizing liquid fuel such as a household or commercial stove to perform combustion.
[0002]
[Prior art]
Generally, as shown in FIG. 1, a combustion apparatus for vaporizing liquid fuel to perform combustion includes a cartridge 1 in a housing 1, an oil tray 3 for storing liquid fuel supplied from the cartridge tank 2, and an oil tray. 3 comprises a combustion unit 5 for heating, vaporizing and burning the liquid fuel supplied by the electromagnetic pump 4 and operating the operation unit 6 including operation keys such as an operation switch 7 and display components such as an operation switch display lamp 8. I have.
[0003]
Further, as shown in FIG. 2, the combustion section 5 has a vaporization heater 9 therein to vaporize the liquid fuel, a burner 11 that burns the vaporized gas ejected from the vaporization apparatus 10, and pumps up the liquid fuel to vaporize it. An electromagnetic pump 4 for supplying to the apparatus 10 is further provided. A further 12 is a burner mixing tube for mixing the vaporized gas from the vaporizing apparatus 10 with the primary air to form a mixed gas. Reference numeral 13 denotes a nozzle for ejecting the vaporized gas of the liquid fuel vaporized by the vaporizer 10 to the burner mixing pipe 12. The nozzle 13 is opened and closed by energizing a solenoid coil 14. Reference numeral 15 denotes a vaporizer temperature sensor for detecting the temperature of the vaporizer.
[0004]
Further, reference numeral 16 denotes an ignition heater for igniting the mixed gas by being heated by being energized to be in a red heat state. FIG. 3 is an enlarged perspective view of a main part to which the ignition heater 16 is attached. The ignition heater 16 has a predetermined distance above the flame opening 17 so that the ignition heater 16 can sufficiently contact the mixed gas from the flame opening 17 of the burner 11. It is held and attached.
[0005]
Next, the operation of the above-described combustion apparatus when starting combustion during normal operation will be described with reference to the timing chart of FIG. As shown in the figure, when the operation switch 7 of the operation unit 6 is turned on, the energization of the vaporization heater 9 of the vaporization device 10 is started (point a). When power is supplied to the vaporization heater 9, the vaporization device 10 is heated by the heat generated by the vaporization heater 9, and when the temperature detected by the vaporization device temperature sensor 15 rises to a temperature at which the liquid fuel can be vaporized, the power supply to the ignition heater 16 starts. (Point b).
[0006]
Then, when power is supplied to the ignition heater 16 for a predetermined time (Tb), the electromagnetic pump 4 is started to supply liquid fuel into the vaporizer 10, and the liquid fuel is heated and vaporized in the vaporizer 10 to vaporize. It becomes gas. On the other hand, since the solenoid coil 14 is energized before and after the start of the electromagnetic pump 4, the nozzle 13 opens and closes, and the vaporized gas in the vaporizer 10 is ejected from the nozzle 13 to the burner mixing pipe 12. Then, the primary air is supplied to the burner mixing pipe 12 by the output power of the vaporized gas to become a mixed gas, and the mixed gas is ignited by the ignition heater 16 in a red-hot state, and passes through the flame opening 17 of the burner 11. The combustion is started (point c).
[0007]
Next, the operation in the case where the operation of the combustion device is stopped during the combustion operation and the operation is started again will be described with reference to the timing chart of FIG. As shown in the drawing, when the operation of the combustion device is restarted after a predetermined time after the operation of the combustion device is stopped (point a), the energization of the ignition heater 16 is started simultaneously with the start of the operation (point b). After energization for a certain time (Tb), the electromagnetic pump 4 starts, and at the same time, the nozzle 13 of the vaporizer 10 opens and closes, and the vaporized gas and air ejected from the nozzle 13 become mixed gas in the mixing pipe. The portion 17 contacts the glowing ignition heater 16 and is ignited to start combustion (point c). That is, even when the operation is stopped during the combustion operation and the operation is started again, the ignition heater 16 is energized for a certain time (Tb) as in the case of starting the combustion during the normal operation.
[0008]
[Patent Document 1]
Patent Registration No. 2,566,437
[Problems to be solved by the invention]
By the way, when the temperature of the vaporizer reaches a temperature at which the liquid fuel can be vaporized, the ignition heater needs to be in a red-hot state enough to ignite the mixed gas ejected from the burner. Since the temperature rise due to the heating is earlier than that of the vaporization heater of the vaporizer, the power supply start time to the ignition heater is started later than the power supply start time of the vaporization heater, so that the power supply time to the ignition heater is set to a fixed time.
[0010]
This is because the temperature of the vaporizer is detected by a vaporizer temperature sensor attached to the vaporizer, and the temperature detected by the vaporizer temperature sensor is compared with a preset combustion start temperature to determine the temperature of the vaporizer. The necessity of energization can be determined, but in the case of an ignition heater, the temperature rise due to energization is so rapid that it is difficult to detect this temperature. Therefore, it is set to a fixed time.
[0011]
However, when the operation is resumed in a short time after the operation is stopped and combustion is started, for example, when the combustion is stopped due to an instantaneous power failure or operation stop by a safety device such as the operation of a seismic sensor and the operation is restarted. Although the temperature of the vaporizer hardly decreases and the temperature of the ignition heater also reaches the temperature at which ignition can be achieved by short-time energization, combustion is started after energizing the ignition heater for a certain period of time. As a result, it took more time than necessary from the restart to the start of combustion.
[0012]
Furthermore, during operation, the ignition heater is exposed to a flame, and when the operation is stopped, the ignition heater is heated to a certain high temperature, so that it is not necessary to supply power again for a certain period of time. Will do. Further, since the electric current is further supplied for a certain period of time from the state in which the ignition heater is at a high temperature, the temperature of the ignition heater becomes higher than the temperature at which combustion can be started, which adversely affects the durability of the ignition heater.
[0013]
The present invention has been made to solve the above problem, and when the operation is temporarily stopped during the combustion operation and then started again, the time from the restart to the start of combustion is reduced by shortening the energization time to the ignition heater. It is an object of the present invention to provide a combustion device that can reduce the time required for ignition, reduce the power consumption of the ignition heater, and improve the durability of the ignition heater.
[0014]
[Means for Solving the Problems]
According to the first aspect of the present invention, a vaporizer for vaporizing a liquid fuel, a vaporizer heater for heating the vaporizer, an electromagnetic pump for feeding the liquid fuel to the vaporizer, heat is generated by energization, and the vaporized gas is ignited. A combustion device comprising: an ignition heater, a burner that burns vaporized gas ignited by the ignition heater, timer means for measuring an operation stop time, and a control unit. When the operation is once stopped and then restarted, when the operation stop time measured by the timer means is shorter than a predetermined time, the power supply time to the ignition heater is made shorter than the normal power supply time, thereby The time from the start of operation to the start of combustion can be shortened, the power consumption of the ignition heater can be reduced, and the durability of the ignition heater can be improved.
[0015]
According to a second aspect of the present invention, there is provided a vaporizer for vaporizing liquid fuel, a vaporizer heater for heating the vaporizer, an electromagnetic pump for feeding the liquid fuel to the vaporizer, and heat generated by energization to ignite the vaporized gas. A combustion device comprising: an ignition heater, a burner that burns vaporized gas ignited by the ignition heater, timer means for measuring an operation stop time, and a control unit. When the operation is once stopped and then restarted, the energization time to the ignition heater is changed in accordance with the operation stop time measured by the timer means, so that the operation from the restart to the start of combustion is performed. The time can be shortened, the power consumption of the ignition heater can be reduced, and the durability of the ignition heater can be improved.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a combustion apparatus according to an embodiment of the present invention will be described with reference to the drawings. The configuration of the combustion apparatus according to the present embodiment is different from the conventional combustion apparatus only in the control unit, and the other configuration is the same. Therefore, the same reference numerals are given to the same components and the detailed description thereof is omitted. I do. In addition, since the operation at the start of normal combustion is the same as that of the conventional example in both the first and second embodiments, the description will be omitted, and the operation will be described in the case where the operation is stopped once during the combustion operation and then restarted. The operation will be described.
[0017]
FIG. 4 is a block diagram showing the control unit 18 of the liquid fuel combustion device according to the first and second embodiments of the present invention. As shown in the figure, reference numeral 19 denotes a microcomputer having timer means 20, which measures the time from when the combustion device stops operating until it starts operating. Reference numeral 21 denotes an ignition heater drive circuit which controls the energization of the ignition heater 16 based on a signal from the microcomputer 19. Reference numeral 22 denotes a vaporizing heater driving circuit, 23 denotes an electromagnetic pump driving circuit, and 24 denotes a solenoid coil driving circuit, which controls the vaporizing heater 9, the electromagnetic pump 4, and the solenoid coil 14 by signals from the microcomputer 19, respectively. .
[0018]
(Embodiment 1) A combustion apparatus according to Embodiment 1 of the present invention will be described with reference to a time chart of FIG. As shown in the figure, when the user presses the operation switch 7 during the operation of the combustion device, or when the safety device is activated and the operation is stopped, the control unit 18 transmits the liquid fuel from the electromagnetic pump 4 to the vaporizer 10. The oil supply is stopped, the energization of the solenoid coil 14 is stopped, the nozzle 13 is closed, and the energization of the vaporization heater 9 is stopped, and at the same time, the timer means 20 of the control unit 18 starts time counting simultaneously with the operation stop. (Point a)
[0019]
Then, when the operation switch 7 is pressed down to start the operation again, the control unit 18 determines whether it is necessary to energize the vaporization heater 9 of the vaporization device 10 based on the detected temperature of the vaporization device temperature sensor 15, and If it is necessary to energize, the energization to the vaporization heater 9 is started. In addition, since the timer means 20 ends the timing at the same time when the operation switch 7 is pressed, the control unit 18 compares the operation stop time measured by the timer means 20 with a predetermined time (ta) set in advance. Determines the energizing time to the ignition heater 16 (point b). That is, if the operation stop time is longer than the predetermined time (ta), the power supply time to the ignition heater 16 is set to the power supply time during normal operation (Tb). Conversely, if the operation stop time is short, the power supply time to normal operation (Tb) is set. The shorter energization time (Ta) is set.
[0020]
This is because the temperature of the ignition heater 16 also changes depending on the length of time from the stop of the operation of the combustion device to the start of the operation of the combustion device. That is, if the operation stop time is long, the temperature drop of the ignition heater 16 is large, but if the operation stop time is short, the temperature drop is small. Therefore, when the operation stop time is short, the temperature of the ignition heater 16 at the start of the operation is somewhat high, so that the mixed gas can be ignited in the energization time (Ta) shorter than the energization time (Tb) in the normal operation. This is because a red heat state can be obtained.
[0021]
When the energization of the ignition heater 16 ends, the nozzle 13 of the vaporizer 10 opens and closes at the same time when the electromagnetic pump 4 starts, and the vaporized gas and air ejected from the nozzle 13 become mixed gas in the mixing pipe, and the burner 11 Then, it comes into contact with the red-heated ignition heater 16 at the flame opening 17 and is ignited to start combustion. (Point c)
[0022]
As described above, the control unit 18 measures the time when the timer means 20 stops the operation during the operation of the combustion device and starts the re-operation, and compares the operation stop time with a predetermined time (ta) set in advance. Since the energization time of the ignition heater 16 is determined in this way, the energization time of the ignition heater 16 can be finely controlled, so that the time from the start of re-operation to the start of combustion can be shortened. In addition, the power consumption of the ignition heater 16 can be reduced by shortening the energization time, and the durability of the ignition heater 16 can be improved since the temperature of the ignition heater 16 does not rise more than necessary.
[0023]
(Embodiment 2) The control unit 18 of the combustion apparatus according to Embodiment 2 of the present invention determines the energization time of the ignition heater 16 corresponding to the operation stop time measured by the timer means 20. This will be described with reference to a graph showing the relationship between the power supply time of the ignition heater 16 and the ignition heater 16. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0024]
When the operation is started from the operation stop to the time t0 as shown in FIG. 6 based on the operation stop time measured by the timer means 20, the control unit 18 reduces the power supply to the ignition heater 16 to the shortest energization time (T0). Further, in the operation stop time from time t0 to tb, the energization time to the ignition heater 16 is increased as the operation stop time becomes longer, and the energization time in the normal operation (Tb) is set in the operation stop time longer than the time tb. .
[0025]
As described above, the control unit 18 measures the time when the timer means 20 stops the operation during the operation of the combustion device and starts the restart, and determines the energization time of the ignition heater 16 corresponding to the operation stop time. Therefore, since the energization time of the ignition heater 16 can be finely controlled, the time from the start of re-operation to the start of combustion can be shortened. In addition, the power consumption of the ignition heater 16 can be reduced by shortening the energization time, and the durability of the ignition heater 16 can be improved since the temperature of the ignition heater 16 does not rise more than necessary.
[0026]
【The invention's effect】
As described above, according to the first aspect of the present invention, when the user presses the operation switch during operation of the combustion device, or when the safety device operates to stop the operation and restart the operation, When the operation stop time measured by the timer means is shorter than a predetermined time, the control unit can shorten the time from the start of re-operation to the start of combustion by making the energization time to the ignition heater shorter than the normal energization time. Thus, the power consumption of the ignition heater can be reduced, and the durability of the ignition heater can be improved.
[0027]
Further, according to the invention described in claim 2 of the present invention, when the user presses the operation switch during operation of the combustion device, or when the safety device operates to stop operation and restart operation, the control unit By changing the energization time to the ignition heater in accordance with the operation stop time measured by the timer means, the time from the start of re-operation to the start of combustion can be reduced, and the power consumption of the ignition heater can be reduced. The durability of the ignition heater can be further improved.
[0028]
[Brief description of the drawings]
FIG. 1 is an external view showing a combustion apparatus according to a conventional example and an embodiment of the present invention.
FIG. 2 is an enlarged explanatory view showing a combustion section of a conventional example and an embodiment of the present invention.
FIG. 3 is an enlarged perspective view of a main part to which an ignition heater according to a conventional example and an embodiment of the present invention is attached.
FIG. 4 is a block diagram illustrating a control unit according to the first and second embodiments of the present invention. FIG. 5 is a time chart at the time of restart of the first embodiment of the present invention.
FIG. 6 is a graph illustrating a relationship between an operation stop time and an energization time of an ignition heater according to a second embodiment of the present invention.
FIG. 7 is a time chart at the time of normal operation of the conventional example and the first and second embodiments of the present invention.
FIG. 8 is a time chart at the time of restart of the conventional example.
[Explanation of symbols]
Reference Signs List 4 electromagnetic pump 9 vaporizing heater 10 vaporizing device 11 burner 16 ignition heater 18 control unit 20 timer means

Claims (2)

A vaporizer for vaporizing the liquid fuel, a vaporizer heater for heating the vaporizer, an electromagnetic pump for feeding the liquid fuel to the vaporizer, an ignition heater that generates heat when energized and ignites the vaporized gas, and the ignition heater In a combustion device including a burner that burns the ignited vaporized gas, timer means for measuring the operation stop time, and a control unit, the control unit is configured to temporarily stop the operation during the combustion operation of the combustion device. When restarting the operation, if the time measured by the timer means is shorter than a predetermined time, the power supply time to the ignition heater is set shorter than a normal power supply time. A vaporizer for vaporizing the liquid fuel, a vaporizer heater for heating the vaporizer, an electromagnetic pump for feeding the liquid fuel to the vaporizer, an ignition heater that generates heat when energized and ignites the vaporized gas, and the ignition heater In a combustion device including a burner that burns the ignited vaporized gas, timer means for measuring the operation stop time, and a control unit, the control unit is configured to temporarily stop the operation during the combustion operation of the combustion device. A combustion apparatus characterized in that when restarting the operation, the power supply time to the ignition heater is changed in accordance with the time measured by the timer means.

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