JPS6215632Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a burner that varies the flow rate of fuel in conjunction with the amount of air regulated by an air damper.

[Conventional technology]

When a part of the air that was conventionally controlled by an air damper is supplied to an oil level regulator through a same-pressure pipe, and the amount of air is varied by the air damper, the air pressure applied to the oil level regulator changes. A burner is known in which the fuel flow rate is varied according to the opening degree of an air damper. This type of burner is very easy to handle because the amount of combustion changes automatically just by rotating the air damper knob, and it has a good combustion efficiency and is difficult to cause incomplete combustion because the air and fuel change together, but the amount of air is It is difficult to obtain a wide combustion amount adjustment range with the combustion amount and the combustion flow rate always in a proportional state, and even if the combustion amount is well adjusted,
It was about 100% to 70%.

[Problem that the invention attempts to solve]

In the burner described above, the area from the air flow path through the burner to the burner port is mainly related to the pressure of the air flow path, and for this reason, it is shown in Figure 4A. Similarly, when the damper opening is small and the amount of air is small, where the flame port does not provide a large resistance to air outflow, the increase in air pressure is very small compared to the rate of increase in the amount of air. Further, in a state where the damper opening degree is large and the amount of air is large, where the flame port provides a large resistance to air outflow, the pressure increase in the air flow path becomes large compared to the rate of increase in the amount of air. On the other hand, the flow rate of fuel supplied from the oil level regulator to the burner is proportional to the pressure of the air flow path to which the same-pressure pipe is connected, so the amount of fuel that is There is a problem in that the rate of change in the flow rate changes more greatly than the amount commensurate with the amount of air, which narrows the combustion amount adjustment range.

[Means for solving problems]

1 is a combustion air supply blower, 2 is an air damper,
Reference numeral 6 denotes an air passage, and 5 denotes a burner. Air controlled by an air damper 2 is forcibly sent to the burner 5 through the air passage 6 by a combustion air supply blower 1. Reference numeral 4 denotes an oil level regulator for the fuel pumped up from the oil tank 8, which supplies fuel to the burner 5 via the oil supply pipe 10. Reference numeral 3 denotes a same-pressure pipe that connects the air flow path 6 and the oil level regulator 4, and by adjusting the air damper 2, the amount of air and fuel supplied to the burner 5 can be controlled in conjunction. . Reference numeral 7 denotes a porous screen installed in the air passage 6, and the installation position is between the connection part of the isopressure pipe 3 and the combustion air supply blower 1 and the air damper 2. Note that the porous screen 7 is preferably composed of a plate-shaped porous characteristic thermistor.

The oil level regulator 4 maintains a constant oil level by overflowing the pumped fuel, and an adjustment knob 14 is attached to the oil level regulator 4 to change the overflow position. This allows the height of the oil level to be changed and fixed. A heater 11 is attached to the bottom of the burner 5, and is usually composed of a positive temperature coefficient thermistor. 1
2 is the flame opening of the burner 5.

FIG. 3 is an electrical circuit diagram of the burner according to this invention, and the burner 5 can be ignited and extinguished by opening and closing the power switch 13.

[Explanation of how the device works]

In this type of burner, the power switch 13 is closed and the heater 11 is energized to heat the burner 5 to a high temperature.
A timer or temperature detector detects when the burner 5 reaches or exceeds the vaporization temperature of the fuel, supplies the fuel to the burner 5, vaporizes it, creates a mixed gas with air sent separately, and burns it at the flame port 12. It is. The combustion amount is adjusted by adjusting the air damper 2. When the wind pressure of the air supplied to the burner 5 decreases, the pressure applied to the oil level regulator 4 via the pressure pipe 3 also decreases, and the burner The amount of fuel pushed out to the fuel pump 5 is reduced, allowing the air and fuel to be varied at approximately the same ratio.

By the way, in this invention, a porous screen 7 is attached to the air flow path 6 through which the air regulated by the air damper 2 flows between the connection part of the same pressure pipe 3 and the combustion air supply blower 1 and the air damper 2. The air flow resistor is a porous screen 7 in addition to the flame port 12.
However, the pressure change in the air flow path 6 due to the opening and closing of the air damper 2 is controlled by the combustion air supply blower 1 side of the porous screen 7 compared to the conventional air flow path 6.
The air flow path 6 on the burner 5 side began to show a small pressure change due to the orifice effect.

That is, even if the air damper 2 has the porous screen 7, by operating it slightly open, the amount of air ejected from the flame port 12 can be made the same as in the conventional case. With respect to this amount of air, the pressure change in the air passage 6 on the burner 5 side is as shown in Fig. 4 (b), and when the opening degree of the air damper 2 is small, the influence of the porous screen 7 is small, and the pressure is as shown by the dotted line. Decreased slightly from the position. Further, when the opening degree of the air damper 2 is large, the orifice effect of the porous screen 7 appears strongly, and the pressure in the air flow path 6 on the burner 5 side is greatly reduced compared to the conventional position. Therefore, the rate of pressure change in the air flow path 6 on the burner 5 side of the porous screen 7 is smaller than that in the conventional case. However, since the absolute value of the pressure itself is decreasing overall, it is necessary to change the oil level height of the oil level regulator 4 and make corrections so that an appropriate amount of fuel is sent to the burner even at a low pressure.

The above-mentioned porous screen 7 is composed of a plate-shaped porous thermistor, and the combustion air supply blower 1 is energized to pass through the holes of the thermistor when the burner 5 is preheated.
By heating the air, the burner 5 is also heated by the high-temperature air, and the preheating time can be shortened.

[Effect of idea]

As mentioned above, this invention has a simple structure in which a porous screen is attached to a specific position, and a wide range of variable combustion amount can be obtained by changing only the opening degree of the air damper, which improves handling performance. This is a creative idea.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the burner of this invention, Figure 2
The figure is a cross-sectional view of the same part, Figure 3 is an electrical circuit diagram, and Figure 4 is a cross-sectional view of the same part.
The figure is a diagram showing the relationship between air volume and pressure. 1... Combustion air supply blower, 2... Air damper, 3... Same pressure pipe, 4... Oil level regulator, 5...
...burner, 6... air flow path, 7... porous screen.

Claims (1)

[Claims for Utility Model Registration] (1) Combustion air supply blower 1 and air damper 2 are connected to air passage 6 connected to burner 5, and oil level regulator 4 and air In the burner, which connects the flow path 6 with the same pressure pipe 3 and controls the amount of air and fuel supplied to the burner 5 in conjunction with the adjustment of the air damper 2, the connection part of the same pressure pipe 3 and the combustion air This is an air-fuel variable burner in which a porous screen 7 is attached to an air passage 6 between a supply blower 1 and an air damper 2. (2) The air/fuel variable burner according to claim 1, wherein the porous screen is a plate-shaped porous positive temperature coefficient thermistor.