JPS5842733Y2 - liquid fuel combustion equipment - Google Patents

Description

[Detailed description of the invention] The present invention relates to a liquid fuel combustion device using a vaporization premixing method, which is used with a relatively small calorific value, such as in oil stoves, oil stoves, etc., and which is desired to have a wide range of thermal power adjustment. It is.

Various types of liquid fuel combustion devices using the vaporization premixing method have been tried in the past, but all of them have problems in use, such as being unsuitable for combustion with a small calorific value or having a narrow range of thermal power adjustment. It was an inconvenience.

For example, vaporizing burners have been put into practical use.

The minimum combustion amount is about 1500 kcal/h, and it is technically difficult and uneconomical to obtain a combustion amount smaller than this.

Also, a method has been attempted in which atomized fuel is injected from a spray nozzle by air injection and sent to the vaporizer cylinder, but the minimum combustion amount in this method is also about 1000 kcal/h.

On the other hand, there is a method in which fuel is supplied to the surface of a rotating plate that rotates at high speed, and a part of the phase range of the atomized fuel injected from the entire periphery is selectively taken out and sent to the vaporization chamber. The minimum combustion amount can be obtained up to about 500 kcal/h,
Moreover, since it can be adjusted steplessly up to a maximum of about 2500 kcal/h, it is suitable for the above-mentioned purpose and is easy to use.

However, in order to arbitrarily adjust the amount of vaporization using this method and to stabilize the amount of vaporization at each position of the adjustment operation, it is necessary to inject a uniform amount of atomization from the entire periphery of the rotating plate. However, in the conventional method, injection unevenness occurs at each phase of the periphery of the rotary plate, or the injection amount varies over time even in the same phase.

Therefore, there were problems such as the stepless adjustment of firepower was not smooth or the firepower was sometimes slow.

This invention is intended to improve the above-mentioned problems, and embodiments of the invention will be described below with reference to the drawings.

In Figures 1 to 4, 1 is a burner body that forms a flame lower with a burner cap 6 mounted on the upper part, and a mixture chamber 1a located above and vaporized below by a mixing partition plate 5 disposed inside. A chamber 1b is formed.

Reference numeral 4 denotes an atomized fuel inlet that projects from the side of the vaporization chamber 1b and is open.

2 is a vaporization heater embedded around the vaporization chamber 1b.

Rotating plate 22. Fan impeller 23. pump impeller 24
are both attached to a rotating shaft 21 and driven by a motor 20.

Pass the oil pipe 31 from the leveler 32 to the sub tank 2.
The fuel oil supplied to 7 always maintains its fixed position.

Fuel oil discharged from the pump case 28 due to the rotation of the pump impeller 24 flows down to the central upper surface of the rotating plate 22 through the oil supply pipe 29.

Air sucked from the air suction port 25 of the lower cylinder 19 by the rotation of the fan impeller 23 is discharged from the upper part of the fan case 18 and supplied to the atomization container 10.

The atomization container 10 has its side opened to serve as an atomized fuel outlet 11, and is connected to the atomized fuel outlet 4 of the vaporization chamber 1b with a heat insulating material 9 in between.

A rotatable damper 12 is inscribed in the atomization container 10 and controls the opening degree of the atomization fuel outlet 11.

30 is a drain pipe that communicates the atomization container 10 and the sub-tank 27.

Note that 17 is a bundle, and the damper 12 is rotated by this bundle 17.

To explain the operation of this device, first, the vaporization heater 2
When power is applied to each part of the burner body 1 to reach a predetermined temperature and preheating is completed, when power is applied to the motor 20 next, the rotary plate 22. Fan impeller 23. The pump impeller 24 rotates, and the fuel oil that flows down onto the upper surface of the rotating plate 22 is injected as atomized particles from the entire periphery of the rotating plate 22 due to centrifugal force.

However, most of it hits the damper 12 and drips downward, and then passes through the drain pipe 30 to the sub tank 2.
The remaining atomized fuel that has returned to the fuel tank 7 and passed through the opening of the damper 12 is injected into the vaporization chamber of the burner body 1.

At the same time, the air supplied to the atomization container 10 by the rotation of the fan impeller 23 also passes through the opening of the damper 12 and is sent to the vaporization chamber 1b.

The atomized fuel injected into the vaporization chamber 1b contacts the high-temperature wall of the vaporization chamber 1b and becomes vaporized gas, which is heated while being mixed with air and ejected from the lower flame.

Therefore, if you ignite it, combustion will begin immediately.

In such a configuration, when the opening degree of the damper 12 is changed, the amount of atomized fuel injected into the vaporization chamber 1b changes, and at the same time, the amount of air delivered also changes, so the air-fuel ratio is always maintained constant. The amount of combustion can be adjusted, and complete combustion can always be maintained stably.

If the maximum opening degree of the damper 12 (for example 45 degrees) is set to high flame combustion (for example 2500 kcal/h), the opening degree will be narrowed down to low flame combustion (500 kcal/h).
), sufficiently stable combustion can be obtained.

As mentioned above, this combustion device is highly effective for small combustion appliances. 22a in Figure 5, 22 in Figure 6
The conventional rotary plate shown in Fig. b had some drawbacks.

In other words, these rotating plates 22a, 22 that rotate at high speed
On the surface b, the fuel flowing down from the fuel supply pipe 9 is not spread out with a uniform thickness, but a wave-like ridge is formed, and the amount of atomized fuel generated is uneven around the rotating surface, and this causes a phenomenon that this moves. .

Furthermore, if the fuel flowing down onto the upper surfaces of the rotary plates 22 a and 22 b is slightly shifted from its center, the amount of atomization generated will be uneven.

Therefore, the density of the atomized fuel passing through the opening of the damper 12 has phase or temporal irregularities, and when the combustion amount is adjusted, it does not show a smooth continuous change, and even when the adjustment is constant, the thermal power does not change. You can see that he is taking a breather.

On the other hand, in the previous example of the present invention, a large number of grooves are carved in an intersecting manner on the upper surface, as shown in the rotary plate 22C shown in FIGS. 3a and 1).
This forms a large number of protrusions.

The fuel that has flowed down to the center of the rotary plate 22 spreads along the grooves, but at the intersections of the grooves, it branches in multiple directions and moves outward due to centrifugal force.

Therefore, when reaching the outermost peripheral end of the rotary plate 22, it is evenly spread and a uniform amount of atomization is injected from the entire circumference.

Further, even if the flow of fuel is slightly shifted from the center of the rotary plate 22, the atomized fuel can be uniformly ejected from the entire circumference without causing deviation.

In the embodiment of the present invention, as shown in FIG. 4 in addition to FIG. The fuel spreads out thinly in the flat area, and the atomized fuel can be easily injected from the entire periphery, and the atomized fine particles are completely uniformly distributed.

That is, the contact resistance between the rotating plate 22 and the fuel is increased in the grooves of the rotating plate 22, momentum is sufficiently transmitted to the fuel, the scattering speed from the periphery of the rotating plate 22 is increased, and the fuel is uniformly atomized.

Further, the grooves of the rotary plate 22 disperse the flow direction of the fuel in the circumferential direction, thereby uniformly dispersing the fuel.

The flat portion provided on the periphery of the rotary plate 22 spreads the fuel thinly, so that the fuel can be atomized in the circumferential direction as uniform fine particles.

As mentioned above, the present invention has a large number of intersecting grooves on the top surface of the rotating plate and a flat part on the periphery, so even if the fuel flow is slightly off the center of the rotating plate, the atomized fuel can be injected easily. No deviation occurs.

Therefore, since the amount of vaporization changes in proportion to the degree of opening of the damper, the heating power can be adjusted infinitely smoothly, and there is no flame suffocation.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of a liquid fuel combustion device according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of the atomization container and vaporization chamber of the same liquid fuel combustion device, and Fig. 3 a and l) are Cross-sectional view and top view of the front part of the rotating plate of the same liquid fuel combustion device, Figure 4a
, l) are a cross-sectional view and a top view of a rotating plate of a liquid fuel combustion device according to an embodiment of the present invention, and FIGS. 5 and 6 are cross-sectional views of a conventional example. 1... burner body, 2... vaporization heater,
4... Atomized fuel inlet, 5... Mixing partition plate, 6... Burner cap, 7... Burner port, 9... Insulation material, 10... Atomization container, 11... Atomized fuel outlet, 12... Damper, 18... Fan case, 19... Lower part Cylinder, 20... Motor, 21... Rotating shaft, 22.22 A... Rotating plate, A...
・Flat part, 23...Fan impeller, 24...
... Pump impeller, 25 ... Air suction port, 27 ... Sub tank, 28 ... Pump case, 29 ... Oil supply pipe, 30 ...・・・
... Drain pipe, 31 ... Oil pipe, 32
・・・・・・Leveler

Claims (2)

[Scope of utility model registration request] (1) Liquid fuel is supplied to a rotary plate that rotates in an atomization container, a part of the atomized fuel injected from the periphery is sent to a vaporization chamber, and the vaporized fuel generated in this vaporization chamber is combusted by a burner. Also, a liquid fuel combustion device in which a large number of intersecting grooves are cut on the surface of the rotary plate to which the liquid fuel is supplied, and an annular flat part is formed on the outer periphery of the groove. (2) The liquid fuel combustion device according to claim 1, wherein the flat portion is at the same height as the bottom of the groove.