JPS60111808A - Liquid fuel evaporation type combustion device - Google Patents

Abstract

PURPOSE:To make the device inexpensive and shorten the time of rise-up to a predetermined temperature by a method wherein atomized fuel is burnt with blue flame by utilizing one set of burner ignited instantaneously. CONSTITUTION:When a combustion command is outputted, air, from a fan 1, flows into an evaporating chamber 7 through a burner 2 and burns the fuel under flowing through an air path 10 to heat the evaporating chamber 7 and the downstream thereof. When the temperature of the evaporating chamber 7 arrives at a temperature suitable for the evaporation of the fuel, a pump 3 is stopped and the combustion is stopped immediately. After a predetermined time, the pump 3 reopens the operation thereof and the fuel is sprayed from a nozzle 4. A part of gas from a combustion chamber 13 enters into the fan 1 through a gas path 17 and is mixed with fresh air to supply it into the evaporating chamber 7 and the air path 10. According to this method, the temperature of the evaporating chamber 7 is kept at a predetermined temperature and, thereafter, the combustion is shifted to the blue flame combustion at all times. Accordingly, one burner is enough to effect the blue flame combustion, therefore, the device may be made inexpensive while the combustion chamber operates as the evaporating chamber and, therefore, the time of rise-up may be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a liquid fuel evaporative combustion device that produces blue flame combustion using a burner that ignites instantaneously.

[Background of the invention]

As this type of combustor, there is one that evaporates kerosene with a heater and burns gastritis like a gas burner.

This type has a rectangular burner and can be made thin, but since the kerosene is evaporated using a heater, it takes several minutes from the combustion command to the start of combustion, making it difficult to use.

As a method that does not use a heater, there is a method that uses a gun type burner. This requires two gun-type burners. Based on the combustion command, first, the first gun-type burner installed in the combustion chamber burns the gas, and a part of the combustion gas is supplied to the second gun-type burner. When it reaches about C, the second
Supply fuel and air from the gun type burner to the vaporization chamber,
When this combustion starts, the combustion of the first gun type burner is stopped.

This requires two gun-type burners and is expensive. Furthermore, since the vaporization chamber is heated with a portion of the combustion gas from the first gun-type burner, it still takes some time for the vaporization chamber to reach a predetermined temperature. If you increase the amount of combustion gas that heats the vaporization chamber and shorten the rise time, the amount of exhaust gas in the combustion air of the second gun type will increase, resulting in poor combustion or the temperature of the vaporization chamber at the rated value becoming higher. Sometimes it becomes too much.

[Purpose of the invention]

The second object of the present invention is to provide a burner that is inexpensive and can shorten the rise time.

[Summary of the invention]

The present invention includes: a first burner that atomizes and supplies liquid fuel and ignites it with an igniter to burn it; a premix burner that is connected to the downstream side of a vaporization chamber that constitutes a combustion chamber of the first burner;
a combustion gas passage supplying a part of the combustion gas in the combustion chamber downstream of the premix burner to heat the vaporization chamber of the first burner, and combusts it in the first burner based on an ignition command; When the temperature of the vaporization chamber reaches a predetermined temperature, the first
The combustion of the burner is stopped, and after a predetermined period of time, liquid fuel is supplied without driving the igniter, and ignited by the igniter provided in the combustion chamber.

[Embodiments of the invention]

The present invention will be explained below with reference to an embodiment shown in the drawings. 1 is a blower, 2I is a gun type burner, and 3 is a fuel pump. It is composed of a spray nozzle 41, a spark plug 51, a rotating shaft 6, etc., and burns within the inner periphery 8 that constitutes the vaporization chamber 7. 9 is the outer periphery of the air passage 1o. Reference numeral 11 denotes a known secondary air type premix burner, which is composed of a premix passage, a flame port, a secondary air passage, and the like. The premix passage communicates with the vaporization chamber 7, and the secondary air passage communicates with the air passage 10. 12
is a point plug installed near the flame port of the premix burner 11. 13 is a combustion chamber, 14 is a cross-fin type heat exchanger that heats water, 15 is an exhaust chamber, and 16 is an exhaust port.

17 is a combustion gas passage connecting the combustion i13 and the inlet of the blower 1. The inlet of the blower l opens into the combustion gas passage 14 and the atmosphere.

In this configuration, when a combustion command is given, the blower 1 and gun-type burner 2 are operated as shown in FIG. It also flows through the air passage 10. The gun type burner 2 burns in the vaporization chamber 7 and heats the vaporization chamber and the downstream thereof.

The temperature of the vaporization chamber 7 is 250℃8, which is suitable for evaporating kerosene as fuel! When this happens, the operation of the pump 3 is stopped. This stops combustion immediately. Note that, if the discharge of the spark plug 5 has not stopped at this point, it is also stopped. After a predetermined time (this time is short), the operation of the pump 3 is restarted, and kerosene is sprayed from the nozzle 4. At this time, the spark plug 5 is not discharging and there is no spark, so it evaporates in the vaporization chamber 7, flows out into the combustion chamber 13 through the premix burner 11 while mixing with air, and is ignited by the spark plug 12. The spark plug 12 starts discharging when the pop-up 3 starts operating again.

The combustion gas burned in the combustion chamber 13 is transferred to the heat exchanger 14. It passes through the exhaust chamber 15 and is exhausted from the exhaust port 16.

Further, a part of the combustion gas in the combustion chamber 13 enters the ventilation fit through the combustion gas passage 17, mixes with fresh air, and enters the vaporization chamber 7.
．． The air is supplied to the air passage 10. As a result, the vaporization chamber 7 is maintained at a predetermined temperature, and thereafter the normal combustion operation is started.

According to this, only one gun-type burner is required, so the cost can be reduced. Furthermore, since the combustion chamber of the gun-type burner is a vaporization chamber, the time required to rise to a predetermined temperature can be shortened. In addition, since the amount of combustion gas passing through the combustion gas passage 17 can be determined in principle to maintain the temperature of the vaporization chamber 7 during steady combustion, the amount of combustion gas will not become excessive and good combustion will be achieved. .

In addition, the vaporization chamber 7. Detection of combustion moxibustion in the combustion chamber 13, termination of spark plug discharge, etc. are similarly performed by known means.

Although combustion in the gun type burner 2 is stopped after the temperature of the vaporizing chamber 7 reaches 41 degrees in total, it may be stopped after a certain amount of time has elapsed. Furthermore, the combustion of the gun type burner 2 is stopped by stopping the pump 3.
A solenoid valve may be provided downstream of the pump 3, and combustion may be stopped by operating this solenoid valve.

Further, the amount of combustion by the gun type burner 2 and the amount of combustion during steady state may be different. The gun type burner 2 is preferably one that can produce blue flame combustion.

Moreover, the gun-type burner 2 may not be used as long as it is a burner that can be instantly ignited.

In the above embodiment, the combustion gas in the combustion chamber I3 is supplied to the blower l, but a blower exclusively for the combustion gas is provided separately, and the combustion gas is supplied only to the air passage 9, and the air ventilation l! 89 may be supplied to the combustion chamber 13 without being supplied to the premix burner 11. According to this, combustion air is not mixed with combustion gas, so combustion can be performed in the same way as in a normal burner. This is also convenient when using a see-through blower to supply combustion air.

〔Effect of the invention〕

As described above, according to the present invention 1, it is inexpensive and shortens the rise time (
It is possible to provide a burner that can be used.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a water heater equipped with a liquid fuel evaporative combustion device according to an embodiment of the present invention, and FIG. 2 is a flow chart of an embodiment of the present invention during ignition. 1...Blower, 2...Ganta rpvarna,
3... Pump, 4... Nozzle, 5... Spark plug, 7... Vaporization chamber, 10... Air passage, 11...
... Premix burner, 12 ... Spark plug, 13.
... Combustion chamber, 14 ... Heat exchanger Figure 1 Figure 1 Figure 2

Claims (1)

[Claims] 1 A first burner that atomizes liquid fuel and ignites it with an igniter to burn it, a premix burner connected to the downstream side of the vaporization chamber that constitutes the combustion chamber of the first burner, and a premix burner that is connected downstream of the premix burner. It consists of a combustion gas passage that supplies part of the combustion gas in the combustion chamber to heat the vaporization chamber of the first burner, and the first burner burns the combustion gas based on the ignition command, so that the temperature of the vaporization chamber reaches a predetermined temperature. Once the temperature reaches the desired temperature, combustion in the first burner is stopped, and after a predetermined time, liquid fuel is supplied without driving the W igniter, and the combustion is stopped.