JPS593231Y2 - liquid fuel combustion equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a liquid fuel combustion device, in particular one that produces multi-step calorific value by switching the supply of combustion air and fuel. This system switches the combustion mode and prevents kerosene from flowing into a part of the burner even if the fuel pump is run dry.

To explain the present invention with reference to the drawings below, one end of the rotating shaft 4 of the motor 3 disposed in the air circulation chamber 2 of the liquid fuel combustion device 1 has a fan 6.6 that supplies combustion air from the intake pipe 5.
A fuel scattering body consisting of a cone 8 for scattering fuel from the fuel supply pipe 7, a rotating plate 9, a mixing plate 10, etc. is provided at the other end so as to be located inside the burner body 11.

The burner body 11 has a heating heater 12 on the peripheral wall.
A burner head 16 having elongated holes 15, 15 is fitted into the opening on the side of the combustion chamber 14, in which the ignition 13 is disposed, to form a vaporizing chamber.

17 is a piping body, one branched from a pumping pipe 20 for pumping up fuel from a fuel tank 18 via a pump 19 becomes an overflow pipe 21 whose lower part is immersed in the fuel in the fuel tank 18; The other branched pipe becomes a thin tube 22 that communicates with the fuel supply pipe 7, and the other branched pipe becomes a pressure transmission pipe 23 whose tip is opened into the intake pipe 5. A spherical pipe is inserted at a suitable place in the middle of the pressure transmission pipe 23. A bulging portion 24 is provided, and the tip of the pressure transmission pipe 23 is inserted into the intake pipe 5 downstream of a damper 27, which will be described later, so that its tip opening faces the suction port of the intake fan 6.

Further, the connecting portion between the supply pipe 7 and the thin tube 22 and the transmission pipe 23 are communicated with each other through an auxiliary pipe 25.

A damper 27 having an opening 26 in the center is pivotally supported in the intake pipe 5 by a shaft 28, and the shaft 28 works together with the pump 19 so that the damper 27 greatly increases the flow of air in the intake pipe 5. When the shaft 28 rotates in such a way that the shaft 28 is leveled, the amount of fuel pumped by the pump 19 increases, and the shaft 28
8 rotates to effect air circulation through the opening 26, the pumping amount of the pump 19 decreases.

29 is a solenoid valve disposed at a suitable position in the fuel supply pipe 7.

Figure 2 shows the fuel amount and time when high calorific value and low calorific value are continued.

The present invention is constructed as described above, and while the heater 12 is ignited to operate the motor 3, the damper 27 is set parallel to the air flow to obtain a large amount of air, and the discharge amount of the pump 19 is determined to produce, for example, 80,001 Kcal. In terms of calorific value, the fuel pumped up by the pump 19 overflows to the overflow pipe 21 at level A.

Next, when the electromagnetic valve 29 is opened, the fuel from the supply pipe 7 is atomized and vaporized by the fuel scattering bodies, and the elongated hole 1 of the burner head 16 is mixed.
In steps 5 and 15, a blue combustion flame is formed and combustion is performed.

In this case, the head from level A to the tip of the supply pipe 7,
Since the tip of the transmission pipe 23 becomes negative pressure, a large amount of fuel is required at the time of ignition, so the state A is formed, but thereafter it stabilizes at level B and constant combustion continues.

Furthermore, in order to change the calorific value to a low calorific value, for example 4000 Kcal, the damper 27 is rotated to intake air through the opening 26 and the discharge amount of the pump 19 is reduced, so that the stable level of fuel tends to drop from B to level D. But fan 6
Since the rotation of is constant, the reduction of the air circulation area by the damper 27 increases the negative pressure at the suction port of the intake fan 6, and therefore the pressure value increases.The negative pressure acting on the tip opening of the connecting pipe 23 increases. The fuel level in the pumping pipe 20 and the auxiliary pipe 25 is raised, and constant combustion with a low calorific value is stably performed at level C, which is slightly lower than level B.

If the level goes down from level B to level D, fuel will be supplied due to the pressure difference, and red flame will be mixed in, soot will be generated, and incomplete combustion will occur.

Next, when switching to a high calorific value again, according to the present invention, the calorific value is smoothly switched from level C to B. When transitioning from level D to B, fuel is supplied by the pump 19. There is a risk that the flames may swell due to lifting or the fire may be extinguished due to the delay.

Additionally, the fuel in the fuel tank 18 or the pump 19 may be reduced.
If air is sucked in together with fuel by the pump 19 due to loose connections, etc., a bulge 24 is provided in the middle of the connection pipe 23 to bulge out due to the relationship between the diameter of the transmission pipe 23 and the surface tension of the kerosene. Since the air bubbles are collapsed in the portion 24, fuel does not flow into the intake pipe 5 and the air circulation chamber 2 through the transmission pipe 23.

As described above, according to the present invention, a damper is disposed at an appropriate position in an intake pipe communicating with an air communication chamber having an intake fan, and a burner whose calorific value is varied by the damper and a fuel pump is provided. It is possible to reduce fluctuations in the fuel level in the fuel pumping pipe when changing the calorific value, suppressing the occurrence of red flames when switching from high calorific value to low calorific value, and suppressing the occurrence of red flames when switching from low calorific value to high calorific value. This prevents the danger of flames and extinguishing caused by lifting, etc., and achieves stable combustion during switching.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the main part of the present invention, and FIG. 2 is a characteristic diagram of fuel amount and time when the calorific value is changed.

Claims (1)

[Scope of Claim for Utility Model Registration] ■ A damper is disposed at an appropriate position in an intake pipe that communicates with an air circulation chamber having an intake fan, and a burner that varies the amount of heat generated by the damper and a fuel pump is provided, A fuel supply pipe, an overflow pipe, and a pressure transmission pipe are sequentially branched to supply fuel to the burner from below a fuel pumping pipe from which fuel is pumped up from the fuel tank by the pump, and a branch part of the fuel supply pipe and a branch part of the overflow pipe are sequentially branched. A liquid fuel combustion device characterized in that a fuel level is provided in a fuel pumping pipe between the pressure transmitting pipe and the pressure transmitting pipe, and the tip opening of the pressure transmitting pipe faces the suction port of the intake fan. (2) Scope of Utility Model Registration The liquid fuel combustion device according to claim 1, in which a bulge is formed at a suitable position in the middle of the pressure transmission pipe.