JPS61250412A - Evaporator for liquid fuel combustion apparatus - Google Patents

Abstract

PURPOSE:To continuously make it possible to keep a specified combustion rate, by arranging a means of detecting temperatures and pressures of evaporating tubes, thereby controlling the delivery pressure of a fuel pump. CONSTITUTION:Temperature control of evaporating tubes 1 is accomplished by turning a heater 2 on or off by means of a thermistor 6, whereas the evaporating rate of fuel depending on the heat load largely varies with the control of heating rate. Accordingly, the temperatures in the evaporating tubes 1 varies in excess of the differential temperature being controlled by the on-off control action; temperatures of the fuel gas flowing out from nozzle 5 also varies following the temperatures in the evaporation tube. Setting of combustion rate is performed by controlling the capacity of a fuel pump 3 using a controller 11. Themperature of the fuel gas flowing from the nozzle 5 is detected by a temperature detecting thermistor 6 and pressures of the evaporating tube 1 is detected by a pressure sensor 10. In response to the values thus obtained the controller 11 increases or decreases the delivery pressure of the fuel pump 3. As the pressure in the evaporating tube 1 is at all times kept constant, the combustion rate can be maintained at specified values.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a vaporization device for a liquid combustor that pumps liquid fuel into a heated vaporization tube to vaporize it and ejects it from a nozzle at high speed to burn it. .

2. Description of the Related Art The conventional vaporizer of this type of liquid fuel combustor is called the Bunsen type, and as shown in FIG. A fuel supply pipe 4 connected to a fuel pump 3 is connected, and the other end has a 0.5 to 0
．． A nozzle 5 having an opening of about 8 mm was provided.

A heater 2 that heats the vaporizing tube 1 is energized and turned off by a thermistor 6 that detects the temperature near the vaporizing tube 1 to adjust the temperature to a constant temperature.

Problems to be solved by the invention However, in the above-mentioned groove formation, the amount of combustion increases and decreases,
Changes in the amount of heat generated, deterioration of combustion conditions, and instability occurred. The amount of combustion, that is, the amount of fuel supplied, is determined by the P-Q characteristics of the fuel pump 3 and the loss pressure of the fuel supply pipe 4, vaporizer pipe 1, and nozzle/L15, but most of the loss pressure is caused by the fuel gas passing through the hole of the nozzle Lv5. It occurs when Therefore, when the temperature of the vaporizer tube 1 changes, the temperature of the fuel gas flowing through the nozzle 5 changes, so the volume of vaporized fuel gas per weight changes, and the loss resistance passing through the nozzle 5 decreases as the temperature decreases and increases as the temperature increases. As the temperature of the vaporizer tube 1 becomes lower, the amount of combustion increases, and as the temperature increases, the amount of combustion decreases.

Further, the P-Q characteristics of the fuel pump 3 greatly increased and decreased depending on the power supply voltage, causing a change in the amount of combustion. When the amount of combustion changes in this way, not only does the calorific value not reach the set value, but it also causes discomfort and danger such as misfires, standing flames, and the generation of odors.

Means for Solving the Problems In order to solve the above problems, the vaporization device for a liquid fuel combustor of the present invention is configured to detect the temperature and pressure of the vaporization pipe and control the discharge pressure of the fuel pump. It is something.

Effect of the Invention With the above-described configuration, the present invention corrects the fuel pump pressure corresponding to the change in pressure loss at the nozzle hole due to the change in the fuel gas temperature by detecting the temperature of the vaporizing pipe, and also corrects the discharge fluctuation of the fuel pump. By detecting the pressure inside the vaporizing pipe and controlling and correcting the discharge pressure of the fuel pump, it is possible to always maintain a predetermined combustion amount.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. In FIG. 1, 1 is a vaporizer tube.

A heater 2 is provided inside the vaporizing pipe 1, and a fuel supply pipe 4 is connected to one end of the vaporizing pipe 1 to a fuel pump 3.
The other end communicates with the nozzle part 5. The heater 2 is turned off by the thermistor 6 that detects the temperature of the vaporizing tube 1. Rod 7 installed inside the nozzle/L/s
moves left and right by the solenoid 8 to open and close the hole of the nozzle/I15. Reference numeral 9 denotes a temperature detection thermistor embedded in the nozzle 5, and a pressure sensor 10 installed in the side wall of the vaporization cylinder 1 detects the pressure inside the vaporization cylinder, as well as a controller 1 for controlling the fuel pump 3.
Connect to 1. The nozzle 5 is a Bunsen-type combustion part 12
It is located facing the ejector section of the.

Next, the operation of the above configuration will be explained.

The heater 2 is energized to heat the vaporizing tube 1, and when the vaporizing tube 1 reaches a predetermined temperature, the fuel pump 3 is energized to supply fuel to the vaporizing tube 1 through the fuel supply pipe 4. The fuel supplied to the vaporization tube 1 turns into vaporized gas and is ejected from the hole of the nozzle 5 because the vaporization tube 1 is at a high temperature. When the fuel vaporizes, the volume increases significantly, so the pressure inside the vaporizer pipe becomes high and the nozzle/I1
It ejects from hole 5 at high speed. Therefore, the noz /L/
The fuel gas flow simultaneously sends air into the burner section 12 facing the burner section 6, mixes inside the burner section 12, and forms a premixed mixture that is ejected from the burner port of the burner section 12 to form a flame. The vaporizer tube 1 is
Temperature control is performed by turning the heater 2 on and off using the thermistor 6, but the amount of fuel evaporation of the heat load changes greatly due to the adjustment of the calorific value. Therefore, the temperature inside the vaporizing tube 1 changes in accordance with the temperature of the fuel gas that is controlled during on/off control. The combustion amount is set by adjusting the capacity of the fuel pump a using the controller 11. The amount of combustion is determined by the P-Q characteristics (discharge pressure, flow rate) of the fuel pump 3, the loss resistance of the fuel supply pipe 4, the loss resistance of the vaporizer pipe 1, and the loss resistance of the nozzle 5. The loss resistance of the fuel pipe 4 and the vaporization pipe 1 is very small compared to the nozzle (V5) because the fuel is liquid and has a small volume, and the passage area is wide and the flow rate is slow, and most of the loss resistance passes through the hole of the nozzle/L15. Sometimes I die. The area of the hole of the nozzle L15 is always kept constant because the rod 7 moves around the inner wall of the hole when it is opened and closed by a rod 7 driven by a solenoid 8. Therefore, the amount of fuel gas flows out from the nozzle 5 in proportion to the square root of the pressure in the vaporizing tube 1, and a constant combustion amount can be maintained by correcting the specific weight that changes depending on the temperature. Therefore, the temperature of the fuel gas flowing out from the nozzle 5 is detected by a temperature detection thermistor.
Further, the pressure in the vaporizing pipe 1 is detected by a pressure sensor 10, and the discharge capacity of the fuel pump a is increased or decreased by a controller 11 according to the detected value. That is, the discharge pressure of the fuel pump 3 is controlled to the pressure in the vaporizing pipe 1 according to the combustion amount according to the temperature of the fuel tank. Therefore, even if the temperature of the vaporizer tube 1 changes,
Even if the characteristics of the fuel pump change or vary due to voltage fluctuations, the pressure in the carburetor tube 1 can always be kept constant, so the combustion amount can be kept at a predetermined value.

Effects of the Invention As described above, the vaporizer for a liquid fuel combustor of the present invention provides the following effects.

(1) The temperature of the vaporization pipe (fuel vaporization temperature) is detected by a thermistor, and the pressure of the vaporization pipe is detected by a pressure sensor.

By detecting the temperature and controlling the discharge pressure of the fuel supply pump according to the above temperature and pressure, the set combustion amount is always maintained even when the temperature of the vaporizer pipe changes or the characteristics of the fuel pump change. It can be maintained and eliminates standing flames and odors caused by disturbances in the air-fuel ratio.
Good combustion can be carried out without causing misfires, overheating due to changes in the amount of combustion, generation of CO, etc.

(2) If the fuel supply pipe is clogged with garbage, tar is generated in the vaporizer pipe 1, or the fuel pump deteriorates, the performance may deteriorate.
The combustion amount can always be kept constant and long-term reliability can be maintained.

(3) Changes in combustion amount due to heater on/off, variations in the fuel pump, changes in combustion amount due to voltage fluctuations, fuel pump characteristics due to room temperature changes, and changes in combustion amount due to changes in piping resistance are completely eliminated because the temperature and pressure of the vaporizer pipe are controlled. It disappears.

Therefore, it is possible to set a wider combustion range and provide a burner with high comfort, energy savings, and performance.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of a vaporizer for a liquid fuel combustor according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of a conventional vaporizer for a liquid fuel combustor. 1... vaporizer tube, 2... heater, 3...
...Fuel pump, 5...Nozzle, 9...
... Temperature detection thermistor, 10 ... Pressure sensor.

Claims (1)

[Claims] A vaporizing pipe having a heater, a fuel pump communicating with one end of the vaporizing pipe, and a nozzle communicating with the other end of the vaporizing pipe, a temperature detection sensor in the vaporizing pipe, and a pressure detecting pressure inside the vaporizing pipe. A vaporizing device for a liquid fuel combustor that is equipped with a sensor to detect the temperature and pressure of the vaporizing pipe and control the discharge pressure of the fuel pump.