JPH07109302B2 - Liquid fuel vaporization combustor - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vaporization combustor for vaporizing and burning a liquid fuel such as kerosene, and more particularly to control of the vaporizer.

2. Description of the Related Art Conventionally, a vaporization type combustor of this type is often used in an indoor heater such as an oil fan heater. For example, liquid fuel sent by a fuel pump 1 is fed by a heater 2 as shown in FIG. It is configured to be vaporized by a vaporizer 3 which is heated and burned by a burner 4. Here, the vaporizer 3 detects the temperature by the vaporization temperature sensor 5 and is controlled to a constant temperature by the heater control function 6. Further, the fuel pump 1 is controlled by the room temperature control function 7 to control the temperature inside the room to be constant. The disadvantage of this method is that the carburetor must be preheated when the burner is burned, and the combustion cannot be started immediately.

Therefore, a configuration as disclosed in JP-A-60-256723 is proposed. This is because the fuel pump 1 is controlled to be turned on and off by the room temperature control function 7 in FIG. 3, and the temperature of the carburetor is controlled to the preheating completion temperature 8 by the heater control function 6 while the burner is burning. A switching function 10 is provided so that the carburetor reaches the standby temperature 9 when it is not burning. With this configuration, since the carburetor maintains the standby temperature even when the burner is not burning, the time required to reach the preheating completion temperature when the burner next starts burning is shortened.

Problems to be Solved by the Invention However, in the above configuration, when the burner is changed from the extinguishing state to the burning state by the room temperature control function 7,
Although combustion can be started in a short period of time, when the combustor is first ignited, the same preheating time as in the conventional case is required. If you are using a heater and really need immediate warmth,
This is the first time the operation switch is turned on, and the configuration shown in FIG. 3 has no effect at this time.

Means for Solving the Problems In order to solve such conventional problems, a liquid fuel vaporization combustor of the present invention comprises a vaporizer for vaporizing the liquid fuel by energizing a heater and a burner for burning the vaporized fuel. Includes a combustor that includes the burner, a vaporization temperature control unit that controls the combustion of the burner and controls the energization to the heater by the signal of the vaporization temperature sensor that detects the temperature of the vaporizer, and an operation switch that instructs the start / stop of the combustor. The vaporization temperature control unit has a controller, and the vaporization temperature control unit has a warming circuit unit that drives and controls the heater even when the operation of the combustor is stopped by the operation switch.

Effect of the Invention With the above-described configuration, the present invention makes the carburetor preheated even when the operation switch is off, so that the operation switch is turned on to operate the combustor, and at the same time, the burner starts combustion, and particularly the heating is performed. By applying it to a water heater or a water heater, the room warms up immediately. Alternatively, it has the effect that hot water can be used immediately.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a block diagram of an embodiment of the liquid fuel vaporization combustor 11 of the present invention. FIG. 1 is an example of a heater, and parts having the same operation as in FIG. 3 are given the same numbers. Liquid fuel stored in a fuel tank (not shown) is supplied to the carburetor 3 by the fuel pump 1 through the fuel pipe 12. The vaporizer 3 is heated by the heater 2 to vaporize the fuel. The vaporized fuel is mixed with air necessary for combustion, ignited by an igniter (not shown), and burned in the burner 4.

The fuel pump 1 and the vaporization heater 2 are drive-controlled by a controller 13. The fuel pump 1 controls the fuel supply amount by the combustion control unit 14 so that the temperature of the room becomes constant. On the other hand, the heater 2 is controlled by the vaporization temperature control unit 15 so that the temperature of the vaporizer 3 detected by the vaporization temperature sensor 5 is maintained at a preset temperature.

Reference numeral 16 is an operation switch for instructing the operation of the combustor 11. When the operation switch 16 is turned on, the combustor 11 operates and the burner starts combustion. Here, the warming circuit 17 operates when the operation switch 16 is turned off, and only the vaporization temperature control unit 15 continues to operate. At this time, the temperature setting of the vaporizer 3 may be switched to a temperature lower than that when the burner is burning.

Reference numeral 18 is a selection switch for selecting whether or not the warming circuit 17 is operated, and when the user wants to save power consumption, the selection switch 18 is turned off to enable the same use as the conventional combustor. When the user desires quick heating, the warming circuit operates by turning on the selection switch 18 even when the operation switch 16 is off, and the carburetor 3
Since it keeps warm, the burner can be ignited immediately when the operation switch is turned on.

When the selection switch 18 is on, the indicator 19
Is displayed to warn the user. The temperature setting may be switched to a lower temperature than when the burner is burning.

Reference numeral 18 is a selection switch for selecting whether or not the warming circuit 17 is operated, and when the user wants to save power consumption, the selection switch 18 is turned off to enable the same use as the conventional combustor. When the user desires quick heating, the warming circuit operates by turning on the selection switch 18 even when the operation switch 16 is off, and the carburetor 3
Since it keeps warm, the burner can be ignited immediately when the operation switch is turned on.

When the selection switch 18 is on, the indicator 19
Is displayed to warn the user.

FIG. 2 shows a specific circuit diagram of the main part of the present invention. The same parts as those in FIG. 1 are given the same numbers. 20 is a DC power supply circuit, which includes a combustion control unit 14, a warming circuit unit 17, and a vaporization temperature control unit 15.
And so on. The combustion control unit 14 includes an operation switch 16
Is connected to ON (a contact), the burner 4 in FIG.
The fuel pump 1 is driven and controlled to burn the fuel. At the same time, the temperature setting signal c of the vaporizer 3 is output to the vaporization temperature control unit 15.

The vaporization temperature control unit 15 compares the set temperature signal c from the combustion control unit 14 and the signal d of the vaporization temperature sensor 5 with the comparator 21, and outputs a signal to the transistor 22. Here, the comparator 21 uses a generally known operational amplifier (OP amplifier). now,
When the temperature of the vaporization temperature sensor 5 is lower than the set temperature, the potential c <d and the output potential e becomes high. This turns on the transistor 22 and drives the relay 23. Relay 23
The contact 24 is connected to the power source 20 in series with the vaporization heater 2 of the carburetor 3, and when the relay 23 is turned on, the contact 24 conducts to supply electric power to the heater 2. If the temperature of the vaporization temperature sensor rises above the set temperature, the transistor
22 is turned off, which stops the energization of the heater 2.
In addition to this, the heater may be controlled by stepless power control.

The above operation is the same as the operation of the conventional combustor, and when the operation switch 16 is turned off here, the combustion control unit 14 stops the combustion of the burner. At this time, the vaporization temperature set value c is designed to be high (equivalent to the + potential of the power supply).
At the same time, the contact of the operation switch 16 is also switched to b, and if the selection switch 18 is turned on, the temperature set value of the carburetor becomes the value f divided by the resistors 25 and 26 of the warming circuit section 17, and thereafter. The vaporization temperature controller 15 compares this temperature with the temperature of the vaporization temperature sensor 5 to drive and control the heater. The diodes 27 and 28 form an OR circuit, and switch the set temperature of the carburetor between c and f according to ON / OFF of the operation switch 16.

Select switch 18 even when run switch 16 is off
Since the electric potential f is kept high when is off, the electric potential d> f does not hold and the heater 2 is not energized no matter how much the temperature of the vaporization temperature sensor 5 decreases. That is,
When the selection switch 18 is off, the operation is exactly the same as that of the conventional combustor.

The display 19 uses a light emitting diode (LED) here, and lights up when the operation switch 16 is off and the selection switch 18 is on. This informs that the warming circuit section 17 is operated by the selection switch 18 and the heater 2 is continuously energized. This function is effective for saving power by turning off the selection switch when the combustor is not used for a long time or when it is not necessary to shorten the time from the operation switch on to the start of combustion.

Effects of the Invention As described above, the liquid fuel vaporization combustor of the present invention has the following effects.

(1) Even when the operation switch is turned off and the combustor is not operating, since the carburetor heater is preheated by the warming circuit unit, the burner is quickly ignited after the switch is turned on, and the ignition waiting time is reduced. It almost disappears, and when it is applied to a heater, it gets warm quickly and is very convenient and easy to use.

(2) Since the burner is always preheated by the heat conduction from the vaporizer, the ignition is smooth and the ignition sound is low, and the carbon monoxide (Co) generated during the ignition is small.

(3) Since the temperature of the carburetor is constant even when the ambient temperature of the combustor is as low as 0 ° C. or less, it is easy to ignite and there is no outflow of unburned gas due to ignition delay. Similarly, the power of the igniter can be small.

(4) At the time of ignition, the carburetor is kept at a certain temperature or higher, so that the temperature of the carburetor is less uneven and the local low temperature region is eliminated. For this reason, vaporization at the time of ignition becomes smooth, tar is not generated in the vaporizer, and stable combustion can be performed.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating a control operation of a liquid fuel vaporization combustor according to an embodiment of the present invention, FIG. 2 is a circuit diagram of a main part of a controller, and FIG. 3 is a combustor illustrating a conventional example. It is a block diagram. 2 ... Heater, 3 ... Vaporizer, 4 ... Burner, 5 ... Vaporization temperature sensor, 11 ... Combustor, 13 ... Controller, 15
...... Evaporation temperature control section, 16 ...... Operation switch, 17 ...... Warming circuit section, 18 ...... Selection switch, 19 ...... Display unit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuhiko Yamamoto 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Katsuzo Kogawa, 1006 Kadoma, Kadoma City Osaka Prefecture 72) Inventor Yasushi Hirata 1006, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-55-92817 (JP, A) JP-A-58-200924 (JP, A) JP-A-SHO 61-243218 (JP, A)

Claims (2)

[Claims] 1. A vaporizer for vaporizing liquid fuel by energizing a heater, and a combustor including a burner for burning vaporized fuel,
A controller including a vaporization temperature control unit that controls the combustion of the burner and a signal of the vaporization temperature sensor that detects the temperature of the vaporizer to control energization to the heater, and a controller that includes an operation switch that instructs operation / stop of the combustor. A liquid fuel vaporization combustor having a warming circuit section for driving and controlling the heater by the operation switch even when the operation is stopped, in the vaporization temperature control section. 2. The liquid fuel vaporization system according to claim 1, wherein the controller has a selection switch for selecting an operation of the warming circuit section and an indicator for displaying the operation while the warming circuit section is in operation. Combustor.