JPH04110511A - Vaporized-kerosene burner - Google Patents

Abstract

PURPOSE:To keep the vaporizing temperature at a set point corresponding a wide operation range from a tow capacity to a high capacity by a method wherein the heating of a vaporizer is done by applying a voltage to a heater, and a whole application of alternating voltage and a phase-controlled voltage application are intercharged with each other corresponding to a difference between the set point and the detected temperature of the vaporizer. CONSTITUTION:A main controller 70 has a built-in microcomputer 71 which includes a pump operating capacity setting circuit 72, a heater operating capacity setting circuit 73 and an energizing method switching circuit 74. The heater operating capacity setting circuit 73 determines the heater operating capacity according to the set, combustion capacity that is input from a combustion capacity setting circuit 61, the detected vaporizer temperature that is input from a vaporizer temperature detector 43, and the preset vaporizer temperature. According to the determined heater operating capacity, the energizing method switching circuit 74 outputs a signal value to a phase control circuit 75 corresponding to the operating capacity or turns on a switch circuit 76 for the whole application of normal 100V alternating voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a kerosene vaporizing burner, and more particularly to a kerosene vaporizing burner in which the set temperature of the vaporizer is maintained by controlling the electric power of a heater.

<Prior art and its problems> Kerosene vaporizing burners have been conventionally provided in which kerosene is gasified by a vaporizer equipped with a heater, and the gas is jetted out from a nozzle and guided along with air to a combustion tube for combustion. In this kerosene vaporizing burner, the amount of kerosene supplied is changed in response to a change in combustion capacity, so in order to maintain the vaporizer temperature at a set temperature, it is necessary to change the usage capacity of the heater. As a method for controlling the usage capacity of this heater, phase control using a cycler or the like has been conventionally provided.

However, when controlling only by phase control, the sixth
As shown in the figure, from the viewpoint of control safety, the upper limit is 1
Since it cannot be used near 00V and the lower limit, that is, near OV, if the combustion capacity is increased, even though the heater has capacity, it cannot be used effectively, resulting in insufficient capacity, resulting in poor vaporization. There was a problem.

In other words, Figure 5 shows the vaporizer temperature when heater heating control is performed using only phase control.The vertical axis shows temperature and the horizontal axis shows time.In normal use, phase control The vaporizer is maintained at a set temperature t. When the combustion capacity is increased from this state to time T, the set temperature t
1, but if the required power exceeds the maximum value of the phase control, the set temperature cannot be maintained, and the temperature falls below the vaporization failure limit temperature t4, resulting in vaporization failure.

As mentioned above, especially in burners with a wide combustion capacity range,
Merely controlling the phase of the heater has the disadvantage that poor vaporization tends to occur.

Therefore, the present invention solves the above-mentioned drawbacks of the prior art, and even in burners with a wide range of combustion capacity from low to high capacity, the vaporizer temperature can be adjusted to the set temperature in response to a wide range of combustion capacity from low to high capacity. The purpose of the present invention is to provide a kerosene vaporizing burner which can hold the oil and which does not cause poor vaporization.

<Means for Solving the Problems> In order to achieve the above object, the kerosene vaporizing burner of the present invention has the following features:
A kerosene vaporizing burner in which a vaporizer equipped with a heater gasifies incoming kerosene and sends the gas together with air into a combustion tube for combustion, and the vaporizer is heated by applying voltage to the heater. is characterized in that it is configured to switch between full-pressure application and phase-controlled application of AC voltage in accordance with the difference between a preset vaporizer temperature and a detected vaporizer temperature.

Effect> When the difference between the set temperature of the vaporizer and the actual detected temperature is small, the set temperature of the vaporizer can be sufficiently maintained by energizing the heater through phase control. In addition, if the required power exceeds the maximum value of phase control due to the increased combustion capacity of the burner, and as a result, the difference between the set temperature of the vaporizer and the actual detected temperature becomes large, the heater using phase control By switching from energization control to heater energization by applying full pressure, the difference between the set temperature and the detected temperature is quickly reduced. Therefore, temperature control of the vaporizer can be performed stably, and occurrence of poor vaporization can be prevented.

<Example> Fig. 1 is an overall configuration diagram of a kerosene vaporizing burner showing an example, Fig. 2 is a flowchart showing an example of controlling the heater by the main controller, Fig. 3 is a heater control block diagram, and Fig. 4 is a block diagram of the heater control.
The figure is a time chart showing an example of changes in vaporizer temperature due to control operations.

The kerosene sent from the kerosene tank 10 to the vaporizer 40 through the conveying pipe 30 by the electromagnetic pump 20 is vaporized in the vaporization chamber 41 . The vaporizer 40 is provided with an electric heater 42 for heating the vaporizer 40 and a vaporizer temperature detector 43 for detecting the temperature of the vaporizer 40. The vaporized gas is sent together with air to the combustion tube 50 through the nozzle 44 and is subjected to combustion. A solenoid 45 moves the needle valve 46 forward and backward to open and close the nozzle 44. 47
is the return pipe for residual kerosene.

Burner combustion capacity setting is performed by a remote controller (hereinafter referred to as remote control) 60, and the electromagnetic pump 20 and heater 42 are controlled by the main controller 70 based on this setting.

The main controller 70 is a microcomputer (
A microcomputer (hereinafter referred to as a microcomputer) 71 is built in, and the microcomputer 71 includes at least a pump usage capacity setting circuit 72, a heater usage capacity setting circuit 73, and an energization method switching circuit 74. The pump usage capacity setting circuit 72 determines the necessary pump usage capacity based on the combustion capacity set by the combustion capacity setting circuit 61 configured in the remote controller 60, and controls the pump drive circuit 21. Further, the heater usage capacity setting circuit 73 receives the set combustion capacity input from the combustion capacity setting circuit 61, the vaporizer detection temperature manually inputted from the vaporizer temperature detector 43, and the preset vaporizer setting temperature t. Determine the usage capacity of the heater from Then, depending on the determined usage capacity of the heater, a signal value corresponding to the usage capacity is output to the phase control circuit 75 side via the energization method switching circuit 74, or a signal value corresponding to the usage capacity is outputted to the phase control circuit 75 side via the energization method switching circuit 74, or Switch circuit 76 is turned on.

Referring to FIGS. 2 and 4, if the actual vaporizer temperature (detected temperature) is near the vaporizer set temperature t1 during operation, the amount of power supplied to the heater 43 is controlled by phase control. control and maintain the set temperature t (step 101). Then, at time T, when the burner combustion capacity is greatly increased by the remote control 60, the power supply through phase control becomes insufficient, and the temperature of the vaporizer 40 begins to drop. Time T2
When the vaporizer temperature becomes below t (step 1o2),
In order to cancel the current power supply based on phase control (Step 103), the current supply method is switched to apply a total pressure of 100 V AC (Step 104). This increases the power supply sufficiently to normally restore the vaporizer temperature quickly. When the vaporizer temperature reaches t2 or higher at time T3, step 106), the application of 100-ac total pressure is switched to phase control energization (steps 107 and 101).

Note that if the vaporizer temperature continues to decrease even with the application of 100 V AC voltage and energization, the temperature drops below the poor vaporization limit temperature t4 (step 105), and a timer in the microcomputer 71 is started (step 108) to lower the vaporization defect limit temperature. If t4 or less continues for X seconds, for example, 30 seconds or more (steps 109 and 110), a safe combustion operation, that is, a combustion stop is performed (step 111), the heater energization is stopped (step 112), and of course the pump 20 is also stopped. .

In the above, the vaporizer set temperature t is, for example, 280°C,
The vaporization failure limit temperature t4 is, for example, 230°C, the 100V AC pressure full application start temperature t3 (also the phase control stop temperature) is, for example, 240°C, and the phase control start temperature tz (100V AC total pressure application stop temperature) is, for example. The temperature can be 260°C.

<Effects> The present invention has the above configuration, and according to the kerosene vaporizing burner according to claim 1, the entire AC voltage is adjusted according to the difference between the preset vaporizer temperature and the detected vaporizer temperature. Since the configuration is configured to switch between pressure application and phase control application, fine temperature control near the set vaporizer temperature can be accurately performed using phase control, and also when the temperature is wide (temperature is higher than the set vaporizer temperature). By switching to the energization method by applying the full pressure of AC voltage when the voltage drops below, the carburetor can be quickly heated.Especially in kerosene vaporizing burners with a wide combustion capacity range, it is possible to quickly heat up the vaporizer even when there is a large change (increase) in the combustion capacity. This can be done without causing vaporization failure.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram of a kerosene vaporizing burner showing an embodiment of the present invention, Fig. 2 is a flowchart showing an example of heater control by the main controller, Fig. 3 is a heater control block diagram, and Fig. 4 is a diagram showing control operations. FIG. 5 is a time chart showing an example of a change in vaporizer temperature in a conventional example, and FIG. 6 is a voltage waveform chart showing an example of energization by phase control. 40: Carburetor 42: Heater 43: Carburetor temperature detector 50: Combustion tube 60: Remote controller 70: Main controller 71: Microcomputer

Claims (1)

[Claims] (1) A kerosene vaporizing burner in which a vaporizer equipped with a heater gasifies incoming kerosene and sends it together with air into a combustion tube for combustion, and the burner The heating of the vaporizer is performed by switching between full pressure application and phase control application of AC voltage depending on the difference between a preset vaporizer temperature and a detected vaporizer temperature. Kerosene vaporizing burner.