JPS6152884B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid fuel combustion device that proportionally controls the amount of combustion depending on the amount of hot air. It is an object of the present invention to provide a liquid fuel combustion device suitable for use in a heater, etc., which provides comfortable comfort.

Liquid fuel combustion devices used as hot air heaters include rotary atomization type, pressurized atomization type,
There are pot types, etc., but all types require a constant supply device as a means of supplying combustion.
The structure is complicated, and it is very difficult to adjust the amount of air and fuel supply to obtain a good combustion state. A combustion device that does not have these drawbacks is a fuel suction vaporization type burner that uses a lamp wick. The suction vaporization type does not use a mechanical fuel supply device, and the evaporated fuel is supplied from the vaporization surface by the suction of the wick, so the structure is simple and the fuel supply amount ( It is easy to adjust the amount of vaporization) and the amount of combustion air, and good combustion conditions can be obtained. In addition, under conditions where the temperature near the vaporization section is almost constant, the amount of vaporization is almost proportional to the amount of air supplied to the vicinity of the vaporization section, so a wide variable range of combustion amount can be obtained while maintaining a high-quality combustion state. It is possible to obtain

On the other hand, when considering hot air convection, it is effective for warm air heaters to blow air from a position as close to the floor as possible in order to obtain comfortable heating. A speech bubble is required.

A method of using the above-mentioned wick fuel intake upward type burner in a hot air heater includes a blower mechanism that generates hot air above the burner and sucks combustion air using the negative pressure generated by this air flow. There is a method. According to this method, the amount of combustion air that is almost proportional to the amount of hot air, etc. is obtained, and the amount of combustion that is approximately proportional to the amount of combustion air is obtained. It is possible to change the combustion amount while maintaining good combustion conditions by ejecting warm air from the burner, but the temperature conditions near the vaporization part of the wick are unstable because the high-temperature warm air passes near the burner. . Specifically, in the low combustion region, the temperature near the vaporizer increases, and the amount of vaporization increases relative to the amount of air, resulting in an air shortage, increasing the amount of carbon monoxide, generating soot, and causing widespread combustion. It was difficult to obtain a variable range of quantity.

The present invention overcomes the above-mentioned conventional drawbacks.

An embodiment in which the present invention is applied to a hot air heater will be described below with reference to the drawings.

In Figure 1, 1 is a fuel tank, 2 is fuel,
3 is an outer flame tube, 4 is an inner flame tube, 5 is a lamp wick, 6 is a wick outer tube, 7 is a combustion outer tube, 8 is a combustion tube, 9 is a fan 10
11 is a baffle plate, 12 is an outer cylinder, and this embodiment is characterized by providing a passage through which air flows, as indicated by a dotted line arrow, between the combustion outer cylinder 7 and the combustion cylinder 8. There is.

The fuel 2 supplied to the fuel tank 1 is sucked up by the capillary action of the lamp wick 5 and is supplied to the vaporizing section at the upper end. The airflow generated by the fan 10 driven by the motor 9 generates an airflow A that flows downward through the gap between the baffle plate 11 and the outer cylinder 12 .
Due to the ejector effect due to the flow velocity of airflow A, airflow B is generated, and the secondary combustion space above the burner becomes negative pressure, and air is released from the small holes provided in the inner flame tube 4, outer flame tube 3, and outer core tube 6. is supplied. This air becomes combustion air. At the same time, an air flow as indicated by the dotted arrow is generated in the gap between the combustion outer cylinder 7 and the combustion cylinder 8.

The combustion outer cylinder 7 forms the outer wall of the burner, and the combustion cylinder 8 forms the inner wall of the hot air passage.

Although not shown in FIG. 1, when the tip of the lamp wick 5 is ignited by an ignition heater or the like, the inner and outer flame tubes 4,
3. The fuel is vaporized and burned by the air supplied through the small hole in the outer core cylinder 6, and combustion begins. The combustion heat causes the fuel on the surface of the wick 5 to vaporize, continuing so-called self-thermal vaporization. The burned flue gas is air stream B.
As a result, it mixes with air flow A and flows downward, becoming hot air and being discharged outside the appliance, becoming a hot air heating source. As mentioned above, in order to proportionally control the amount of vaporization by the amount of air supplied from the small hole near the lamp wick 5, it is a condition that the temperature near the lamp wick 5 is approximately constant. As a factor in setting the temperature of the combustion chamber, there is a cooling effect due to hot air C, and in the low combustion region, the flow rate of hot air C decreases, so the cooling effect decreases, and the flow rate of air flow B also decreases. The ability to discharge combustion exhaust gas decreases, and the temperature inside the combustion chamber rises, causing the temperature near the lamp wick 5 to rise. Therefore, in the case of this embodiment, since a gap is provided between the combustion cylinder 7 and the combustion cylinder 8 and an air passage is provided, the combustion cylinder 7 is cooled with an air flow having a temperature lower than that of the warm air C, and Since the temperature of the outer cylinder 7 is lowered, the temperature near the lamp wick 5 is lowered. In addition, when the combustion amount increases due to the temperature rise near the lamp wick 5, the temperature of the hot air C also rises, which worsens the cooling effect and causes a vicious cycle that increases the temperature near the lamp wick 5.
This problem could be solved by providing the airflow with little change in temperature regardless of the increase or decrease in the combustion amount, and the variable range of the combustion amount in the low combustion region could be greatly expanded.

FIG. 2 shows the relationship between the amount of heat generated and the amount of combustion air in this embodiment and the conventional example, where the A line is for this embodiment and the B line is for the conventional example. In this embodiment, the lower limit of the calorific value is approximately 1100 Kcal/h, and if the amount of air is reduced thereafter, carbon monoxide will increase due to air-deficient combustion, and if the amount of air is further reduced, soot will be generated. In the case of the conventional example, the lower limit of the calorific value is about 1500 Kcal/h, and the same process as above occurs thereafter. The cause of this is the relationship between the amount of combustion air and the temperature near the lamp wick shown in Fig. 3. In the case of conventional example B, the point at which the temperature near the lamp wick rises in the low combustion region is higher than in the present example A. It's about what's happening at the moment.

As described above, according to the present invention, the combustion amount variable range can be greatly expanded.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the main parts of a liquid fuel combustion device according to an example of the present invention, Fig. 2 is a relationship diagram between the amount of combustion air and calorific value showing the effect of the liquid fuel combustion device, and Fig. 3 is the same. FIG. 3 is a diagram showing the relationship between the amount of combustion air and the temperature near the wick of the liquid fuel combustion device. 5...Light wick, 10...Fan, 7...Combustion cylinder, 8...Combustion cylinder, 12...Outer cylinder.

Claims (1)

[Claims] 1. A lamp having a wick made of a porous material as a fuel vaporization means, a burner in which the amount of vaporization changes approximately proportionally to the amount of combustion air, and generating an air flow for hot air,
The apparatus includes a blower mechanism that supplies the combustion air to the burner in approximately proportion to the amount of air, and an outer cylinder that guides the hot air air flow downward toward the burner. A liquid fuel combustion device characterized in that an air passage is provided between a combustion cylinder forming an outer wall of a burner and a combustion cylinder forming a hot air passage.