JP3055734B2 - Liquid fuel combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid fuel combustion apparatus used for a heater, and more particularly to a liquid fuel combustion apparatus in which liquid fuel is vaporized by a liquid fuel vaporizer equipped with an electric heater and burned. is there.

[0002]

2. Description of the Related Art Conventionally, a liquid fuel combustion apparatus of this type vaporizes liquid fuel and supplies the vaporized fuel gas to a burner to burn the liquid fuel. It is necessary to heat the vaporizer to an ignition temperature sufficient to vaporize and ignite the liquid fuel, and then supply and vaporize the liquid fuel. For this reason, especially when the room temperature to be used is low, it takes several minutes to heat the liquid fuel vaporizer to the ignition temperature, and the usability is poor, for example, heating is not started easily.

In order to improve this, for example, as shown in FIG. 3, a start / stop switch 2 provided at an appropriate position in a liquid fuel combustion device 1 is connected to an input side of a central control means 3 for executing combustion control and the like. Room temperature detecting means 4 for detecting the temperature of the connected and heated room and outputting the information, room temperature setting means 5 for setting a target value of the room heating temperature, and detecting the temperature of the liquid fuel vaporizer 1. The vaporizer temperature detecting means 7
Similarly, it is connected to the input side of the central control means 3. 8
Is a liquid fuel vaporizer heated by an electric heater 10 supplied with electric power by an electric power supply means 9 connected to an output side of the central control means 3, and the vaporized combustion gas is sent to a burner 11 through a nozzle 13. Supplying. Reference numeral 12 denotes an igniter, which is similarly connected to the output side of the central control means 3. During use, the liquid fuel vaporizer 8 is kept warm at the same time as the operation of the operation switch 2 (stop operation),
It is widely known to reduce the waiting time at the start of operation. (See JP-A-3-17813)

[0004]

In the above-mentioned prior art,
The operation of the operation switch 2 (stop operation) stops the supply of fuel for stopping the combustion, and the energization of the electric heater 10 of the liquid fuel vaporizer 8 is also stopped. In order to start keeping the temperature of the vaporizer 8, it keeps the temperature by energizing the electric heater 10 even in a relatively high room temperature state that does not require heating in a hurry,
It consumes unnecessary power and shortens its life. Also,
In order to keep the temperature of the liquid fuel vaporizer 8 even during the predetermined time during which the nozzle is closed when the combustion is stopped, the heated unburned vaporized gas in the liquid fuel vaporizer 8 is ejected simultaneously with the opening of the nozzle after the lapse of the predetermined time. In addition, abnormal sounds and odors are emitted into the room, giving the user discomfort.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a burner for burning fuel gas, and a nozzle for vaporizing liquid fuel and feeding the vaporized fuel gas to the burner. A liquid fuel vaporizer to be supplied via a liquid fuel vaporizer, an electric heater for heating the liquid fuel vaporizer, and power supply means for supplying electric power to the electric heater.
Nozzle opening / closing means for controlling the opening / closing of the nozzle, vaporizer temperature detecting means for detecting the temperature of the liquid fuel vaporizer and outputting the information, and detecting the temperature of the room to be heated and outputting the information. In a liquid fuel combustion device comprising a room temperature detecting means and a room temperature setting means for setting a target value of a room heating temperature, a first timing means for measuring a first predetermined time when an instruction to stop the combustion operation is given. A second timing means for measuring a second predetermined time from when the nozzle is closed by the nozzle opening / closing means to when the nozzle is opened and closed by the nozzle opening / closing means, and a temperature detected by the vaporizer temperature detecting means. Controlling the power supply means so that the predetermined temperature according to the amount of combustion and a heat retention temperature lower than the predetermined temperature,
In addition to controlling the power supply circuit so that the temperature detected by the carburetor temperature detector becomes a predetermined temperature corresponding to the amount of combustion when an instruction to start the combustion operation is issued, an instruction to stop the combustion operation is issued. When the combustion is stopped, the electric heater is not energized at least until the first predetermined time elapses, and after the predetermined time elapses, the temperature detected by the vaporizer temperature detecting means is used to maintain the temperature of the liquid fuel vaporizer. And a central control means for controlling the electric power supply means so as to maintain the heat retaining temperature. Further, the second predetermined time may be included in the first predetermined time.

[0006]

When the instruction to stop the combustion is given, the energization of the electric heater for heating the liquid fuel vaporizer is stopped, and after the first predetermined time has elapsed, that is, after the room temperature has dropped, the predetermined temperature of the liquid fuel vaporizer is reduced. , And effective heat insulation without wasting power.

When an instruction to stop the combustion is given, the energization of the electric heater for heating the liquid fuel vaporizer is stopped, and the nozzle is closed immediately, and the second predetermined time including the time until the nozzle is reopened. After the lapse of time, that is, after the temperature of the liquid fuel vaporizer decreases, the liquid fuel vaporizer enters a predetermined temperature preservation state, and performs a comfortable heat preservation without any unburned vaporized gas and no spouting sound and odor.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram of a liquid fuel combustion apparatus according to an embodiment of the present invention, and FIG. 2 is an operation characteristic diagram of the liquid fuel combustion apparatus.

In FIG. 1, reference numeral 1 denotes a liquid fuel combustion device, which is constructed as follows. An operation / stop switch 2 provided at an appropriate position is connected to an input side of a central control means 3 for executing control of combustion, etc., and a room temperature detection means 4 for detecting a temperature of a room to be heated and outputting the information and a room. The room temperature setting means 5 for setting the target value of the heating temperature of the fuel cell and the vaporizer temperature detecting means 7 for detecting the temperature of the liquid fuel vaporizer 1 are also connected to the input side of the central control means 3. 8 is a power supply means 9 connected to the output side of the central control means 3.
Fuel gas is heated by an electric heater 10 supplied with power by
3 to the burner 11. 6 is a nozzle 13
A nozzle opening / closing means for controlling the opening / closing of the nozzle, 12 is an igniter, which is also connected to the output side of the central control means 3.

Reference numeral 14 denotes first timer means for counting a first predetermined time (T1) when an instruction to stop the combustion operation is issued. Reference numeral 15 denotes an instruction to stop the combustion operation and the nozzle opening / closing means 6. Is a second time-measuring means for measuring a second predetermined time (T2) from when the nozzle 13 is closed to when it is opened, and both are connected to the central control means 3.

The operation of this embodiment having the above-described configuration will be described.

For example, when the operation / stop switch 2 is operated (operated) while the liquid fuel combustion device 1 is stopped, the central control means 3 detects this and activates the power supply means 9. Electric power is supplied to the electric heater 10 to generate heat, and the liquid fuel vaporizer 8 is heated to increase the temperature. The temperature of the liquid fuel vaporizer 8 is constantly detected by the vaporizer temperature detector 7 and sent to the central controller 3. Thereafter, when the temperature of the liquid fuel vaporizer 8 reaches an ignition temperature sufficient to vaporize the liquid fuel by spending a few minutes of preheating time, the central control means 3 starts supplying the liquid fuel and the nozzle opening / closing means. 6 is operated, and the igniter 12 is operated. The fuel gas vaporized by the liquid fuel vaporizer 8 is ejected from the opened nozzle 13, sent to the burner 11, ignited by the igniter 12, and starts combustion. After the forced combustion for stabilizing the combustion for a predetermined time after the start of the combustion, the fuel supply amount and the like are controlled based on the set temperature information from the room temperature setting means 5 and the room temperature information from the room temperature detecting means 4 to set the room temperature. To control. When the operation / stop switch 2 is operated (stopped) during this combustion, the supply of fuel is stopped, and the first time counting means 14 measures a first predetermined time (T1). Then, the nozzle 13 is closed by the nozzle opening / closing means 6, the second predetermined time (T2) is measured by the second timing means (15), the burner 11 is extinguished, the power supply means 9 is stopped, and the electric heater 10 is stopped.
Is stopped, and the temperature of the liquid fuel vaporizer 8 gradually decreases.

After the combustion operation is instructed and the combustion is stopped, the energization of the electric heater 10 is stopped for the first predetermined time (T1), and the warming operation of the liquid fuel vaporizer 8 is stopped. Is done. When the second predetermined time (T2), when the unburned gas has almost disappeared and the nozzle 13 has been opened and no unburned gas has been ejected, the nozzle 13 opens.
Thereafter, after a lapse of a first predetermined time (T1), the central control means 3
Thus, the power supply means 9 is controlled so that the temperature detected by the vaporizer temperature detection means 7 becomes a heat retaining temperature for keeping the liquid fuel vaporizer 8 warm, and the energization of the electric heater 10 is controlled.

When the operation / stop switch 2 is operated (operated) during the heat retention control, the power supply means 9 is operated so that the temperature detected by the vaporizer temperature detection means 7 changes from the heat retention temperature to the ignition temperature.
To control the energization of the electric heater 10. The temperature reaches the ignition temperature from the warming temperature in a few seconds, and ignites and burns in the order described above. Since the liquid fuel vaporizer 8 is controlled at the heat retaining temperature, the preheating time is shortened, and the combustion is performed quickly.

The timing of the first predetermined time and the timing of the second predetermined time may be ended at the same time.

[0017]

As described above, according to the liquid combustion apparatus of the present invention, the following effects can be obtained.

(1) Since the liquid fuel vaporizer is kept warm while the combustion is stopped, when the operation / stop switch is operated to perform the operation, the preheating time is short, and the trouble of waiting for ignition is reduced. Easy to use.

(2) If the room temperature is relatively high until a predetermined time has elapsed after the combustion is stopped, the temperature is not kept, and the temperature is started after the room temperature is lowered. If there is no immediate need for heating in the operation (operation), there is no heat retention, and if the temperature reaches the temperature that requires heating immediately, the temperature is kept warm, so that it is possible to perform effective heat conservation without wasting power and saving power. .

(3) During the closing of the nozzle after the combustion is stopped, the liquid fuel vaporizer stops the warming operation, so that there is no unpleasant ejection sound when the nozzle is opened, and the unburned gas is almost completely eliminated. Since the warming operation is started, the unburned gas is not released into the room, and the liquid fuel vaporizer can be effectively kept warm without giving the user an unpleasant odor.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a liquid fuel combustion apparatus according to an embodiment of the present invention.

FIG. 2 is an operation characteristic diagram of the liquid fuel combustion device.

FIG. 3 is a configuration diagram of a conventional liquid fuel combustion device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid fuel combustion apparatus 2 Start / stop switch 3 Central control means 4 Room temperature detection means 5 Room temperature setting means 6 Nozzle opening / closing means 7 Vaporizer temperature detection means 8 Liquid fuel vaporization apparatus 9 Power supply means 10 Electric heater 11 Burner 12 Ignition device 13 Nozzle 14 First timer 15 Second timer

Continuation of front page (56) References JP-A-4-283306 (JP, A) JP-A-1-179818 (JP, A) JP-A-1-94718 (JP, U) (58) Fields surveyed (Int .Cl. ⁷ , DB name) F23N 5/02 342 F23D 11/44 F23N 5/20

Claims (2)

(57) [Claims] A burner for burning fuel gas (11)
A liquid fuel vaporizer (8) for vaporizing the liquid fuel and supplying the vaporized fuel gas to the burner (11) via a nozzle (13); and an electric heater for heating the liquid fuel vaporizer (8). Heater (10) and the electric heater (1
0) a power supply means (9) for supplying power, a nozzle opening / closing means (6) for controlling opening / closing of the nozzle (13),
Vaporizer temperature detecting means (7) for detecting the temperature of the liquid fuel vaporizer (8) and outputting the information, and room temperature detecting means (4) for detecting the temperature of the room to be heated and outputting the information. And a room temperature setting means (5) for setting a target value of a room heating temperature, a first timing means for measuring a first predetermined time when an instruction to stop the combustion operation is issued. (14) and an instruction to stop the combustion operation is made, and the nozzle (1) is
3) a second timer means (15) for measuring a second predetermined time from when the valve is closed to when it is opened, and when the temperature detected by the vaporizer temperature detecting means (7) is a predetermined temperature corresponding to the amount of combustion. And when the power supply means (9) is controlled so as to keep the heat retention temperature lower than the predetermined temperature and the start of the combustion operation is instructed, the temperature detected by the vaporizer temperature detection means (7) becomes the combustion amount. In addition to controlling the power supply means (9) so as to reach a predetermined temperature according to the above, when the combustion operation is instructed to stop and the combustion is stopped, at least until the first predetermined time elapses, the electric heater ( The power supply means so that the temperature detected by the vaporizer temperature detection means (7) becomes the heat retention temperature for keeping the liquid fuel vaporization device (8) warm after the first predetermined time elapses without supplying electricity to 10). Central control means for controlling (9) ( ) And De liquid fuel combustion apparatus, characterized in that configured. 2. The liquid fuel combustion apparatus according to claim 1, wherein the first predetermined time includes the second predetermined time.