JPS6314174Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a vaporization type liquid fuel combustion device, and its purpose is that since it takes time to preheat the vaporization chamber, tar is generated from the evaporation residual components, resulting in poor combustion. The aim is to prevent failure of combustion due to clogging of nozzles, etc.

In a conventional vaporized liquid fuel combustion device, liquid fuel from a fuel tank 1 is supplied to a vaporizer 3 by an electric pump 2 or the like, heated by a heating heater 4 to vaporize the liquid fuel, and then sent from a nozzle 5 to a burner. However, in this type of device, it takes time to preheat the inside of the vaporizer 3, so tar is generated from the components remaining in the evaporator, resulting in poor combustion and damage to the nozzle 5. This had the disadvantage that combustion became impossible due to clogging. That is, vaporizer 3
is heated to the vaporization temperature of the fuel (approximately 250℃),
Generally, this takes several minutes, and most of the fuel is vaporized at this temperature, but due to the difference in the evaporation temperature of the fuel components, residual fractions gradually move into the vaporization chamber.
There is a drawback that tar adheres to the nozzle portion, etc., resulting in poor combustion and clogging of the nozzle, making combustion impossible.

The present invention has been devised to eliminate the above-mentioned drawbacks and will be explained in detail below with reference to an embodiment shown in the drawings.

11 is a fuel tank that stores liquid fuel,
It is communicated with the bottom of the vaporizer 13 via the solenoid valve 12, and is usually installed above the vaporizer 13.
When the electromagnetic valve 12 is opened, the liquid fuel is supplied into the vaporizer 13 (hereinafter referred to as a vaporization chamber) by natural head.

The vaporizer 13 is heated to a predetermined temperature by a heater 15 whose energization is controlled by a temperature detection means 14 such as a thermostat, and the upper part of the vaporizer 13 is connected to an inlet portion 18 of a burner 17 via a suction chamber 16. It is communicated. That is, since the vaporizer 13 only has an inlet for liquid fuel at the bottom and an outlet for vaporized gas at the top, outside air does not flow into the vaporizer 13.

19 is an air supply nozzle that injects compressed air by driving the electric blower 20 into the suction chamber 16 toward the inlet portion 18 of the burner 17;
The ejector effect caused by the supply of air from the air supply nozzle 19 sucks the vaporized gas evaporated in the vaporizer 13, mixes it with the air from the nozzle 19, and supplies it to the burner 17 side. At this time,
Since the suction chamber 16 and the vaporizer 13 have negative pressure and the evaporation point of the fuel is lowered, the set temperature of the vaporizer 13 can be set relatively low.

That is, if the pressure in the conventional vaporization chamber is _P1 , the atmospheric pressure is _P0 , and the pressure in the vaporization chamber in the present invention is _P2 , then _P2 < _P0 < _P1 , and fuel pressure - evaporation temperature. Since the characteristics are as shown in Figure 3, the relationship between evaporation temperature at each pressure is t ₂ < t ₀ < t ₁
becomes.

Now, the set temperature t of the vaporizer 13 of the device of the present invention is t ₂
When <t<t ₀ , the time is reduced by Δt=t ₁ -t compared to the conventional case, and therefore, the preheating time of the heater 15 can be shortened from T ₁ to T as shown in FIG.

In addition, the temperature of the vaporizer is relatively increased by △t' = t- _t2 compared to the conventional method, the residual components of the fuel are reduced, and there is no need to make the nozzle hole smaller as in the conventional method. Since it blows air out, there is no need to worry about clogging.

Here, the operation of the present invention will be explained. Now, the solenoid valve 12 is opened and fuel is supplied from the fuel tank 11 to the carburetor 13, and the heating heater 15
When energized, the vaporizer 13 is heated by the heater 15, and the fuel in the vaporization chamber is vaporized.
On the other hand, the air compressed by the drive of the electric blower 20 is injected into the suction chamber 16 from the air supply nozzle 19, and due to the ejector effect at this time, the vaporized gas in the vaporization chamber is sucked into the suction chamber 16, where the air is The mixture is mixed and supplied to the inlet section 18 of the burner 17. At this time, the internal pressure of the vaporizer 13
P ₂ is smaller than the atmospheric pressure P ₀ , and the evaporation temperature decreases by that amount (see Figure 3, t ₂ ). Therefore, if the set temperature of the vaporizer 13 is set slightly higher than this evaporation temperature _t2 (for example, t), the evaporation effect will be that much better. Also, as mentioned above, the vaporizer 13
Since the set temperature can be lowered, the preheating time can be shortened and the generation of tar etc. can be reduced.

As described above, the present invention provides a vaporizer that has only an inlet for liquid fuel and an outlet for vaporized fuel, and that vaporizes liquid fuel using the heat of a heating heater whose energization is controlled by a temperature detection means; A suction chamber that communicates with the outlet and opens to the inlet of the burner, and an air supply that injects air into the suction chamber and uses its ejector effect to suck vaporized gas in the suction chamber and supply mixed gas to the burner side. Since it is equipped with a nozzle, it is possible not only to shorten the preheating time of the vaporization chamber, but also to lower the set temperature of the vaporization chamber, so there is less tar generation, and the diameter of the nozzle hole is also relatively large. This has the remarkable effect of preventing poor combustion due to clogging of the nozzle holes.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of the main parts of a conventional combustion device;
The figure shows a schematic diagram of the main part of the device of the present invention, FIG. 3 shows a characteristic diagram of the pressure in the vaporizing chamber and the evaporation temperature of the fuel, and FIG. 4 shows a characteristic diagram of the temperature rise of the vaporizer. 11: fuel tank, 13: vaporizer, 14: temperature detection means, 15: heating heater, 16: suction chamber,
17: Burner, 19: Air supply nozzle, 20:
Electric blower.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A vaporizer that vaporizes liquid fuel using the heat of a heater that has only an inlet for liquid fuel and an outlet for vaporized fuel, and whose energization is controlled by temperature detection means, and the vaporizer. A suction chamber that communicates with the outlet of the vessel and opens into the inlet of the burner, and air is injected into the suction chamber, and its ejector effect sucks the vaporized gas in the suction chamber to supply mixed gas to the burner side. A vaporizing liquid fuel combustion device equipped with an air supply nozzle. 2. The vaporized liquid fuel combustion apparatus according to claim 1, wherein the temperature of the vaporizer is set higher than the fuel evaporation temperature at the pressure of the vaporization chamber.