JPS602420Y2 - combustion device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a combustion device such as a heating appliance, and aims to reduce combustion noise such as wind noise and vibration noise of combustion flame.

An embodiment of the present invention will be described below with reference to the accompanying drawings.

In Fig. 1, 1 is a cylindrical motor case, 2 is a cylindrical burner case, and 3 is a cylindrical combustion cylinder. They are connected in sequence, and in particular, the combustion tube 3 is connected via a heat-resistant packing 41.

4 is a motor installed inside the motor case 1, and the motor shaft 5
One end protrudes into the burner case 2 and extends to a position close to the combustion tube 3.

An air intake port 6 is provided on the side of the motor case 4, and a plurality of communication holes 7 communicating with the inside of the burner case 2 are provided on the periphery of the end face portion on the burner case 2 side.

8 is a turbo fan fixedly installed in the middle of the motor shaft 5 in the burner case 2, and the turbo fan 8 has multiple stages.
In the figure, two stages are provided, and a guide blade 9 fixed to the burner case 2 is provided on the discharge side of each turbo fan 8.

A blowing chamber 10 is configured by a combination of a turbo fan 8 and a guide blade 9, and static pressure can be increased by increasing the number of stages in the combination.

Reference numeral 11 denotes a partition plate fixed to the burner case 2 at an appropriate distance from the final stage guide blade 9, and a motor shaft 5 is mounted in the center of the partition plate.
A relatively large primary air population 12 is provided through which the primary air population 12 penetrates, and several small secondary air populations 13 are provided at the periphery thereof.

Between the guide vane 9 at the final stage and the partition plate 11 is a flow divider chamber 14.
The blown air that has passed through the guide vane 9 at the final stage is divided into two parts in the division chamber 14, one of which passes through the primary air population 12 of the partition plate 11 and becomes primary air, and the other part passes through the partition plate 11. It passes through 11 secondary air populations 13 and becomes secondary air.

15 is a substantially cylindrical vaporizing cylinder installed in a space on the leeward side of the partition plate 11 in the burner case 2, and is made of a metal material with good thermal conductivity such as die-cast aluminum.
A sheathed heater 16 is embedded in the peripheral wall near the end near the partition plate 11.

One end of this vaporizing cylinder 15 is attached to the partition plate 11 via a heat insulating packing 42, and the other end is in close contact with the periphery of the drawn opening of the burner case 2 via a heat insulating packing 40.

The internal space of this vaporization cylinder 15 is a vaporization chamber 17 that communicates with the primary air population 12 , and between the vaporization cylinder 15 and the burner case 2 there is a secondary air chamber 1 that communicates with the secondary air inlet 13 .
It is 8.

A conical cone 19, a disc-shaped rotary plate 2, and an umbrella-shaped mixing plate 21 are fastened to the tip of the motor shaft 5 protruding into the vaporization chamber 17 with fixing nuts in the above order.

The cone-shaped cone 19 has a larger diameter on the tip side of the motor shaft.
It has a gentle conical shape.

In addition, the mixing plate 21 located on the tip side of the rotary plate 20 is made by drawing a plurality of inclined plates 23 in the middle of the disc, and cutting out a plurality of stirring blades 24 on the inclined plates 23. The outer periphery of the rotary plate 20 is surrounded by a rotary plate 20.

The heater 16 is located in the peripheral wall of the vaporizing cylinder 15, which is the outer periphery of these cylinders.

Reference numeral 22 denotes a liquid fuel supply pipe through which liquid fuel (kerosene) from a pump (not shown) passes.Although not shown, this pipe 22 passes through the distribution chamber 14 and extends slightly above the motor shaft 5. There, it is bent into an inverted U-shape, and its tip opening is positioned close to above the cone-shaped cone 19.

Further, the outer peripheral portion of the primary air population 12 of the partition plate 11 is tapered so as to slightly protrude into the vaporization chamber 17.

25 is a burner head fixedly installed near the tip opening of the carburetor 15 facing the combustion tube 3;
6, rectifier plate 27, porous flame hole plate 28 made of multiple layers of wire mesh
, flame stabilizing plate 29 are stacked and connected in the above order.

The head body 26 is made of aluminum die-casting or the like, and has a secondary air outlet 30 opening toward the central axis of the combustion tube 3 in the center. Several secondary air ports 32 are provided to guide secondary air from the air chamber 18.

Note that a secondary air passage 31 is also provided in a part of the vaporization cylinder 15 facing this passage 32.

Further, a through opening 33 is formed between each secondary air passage 32.

On the other hand, the baffle plate 27 has a central opening 34 in the center into which the secondary air outlet 30 of the head body 26 fits with a gap.

Even if a plurality of porous flame hole plates 28 are stacked together, the overall
Since it is necessary to maintain good air permeability, if the flame hole plate 28 is made of wire mesh, for example, the wire meshes are stacked one on top of the other so that the meshes intersect at right angles.

The flame holding plate 29 has a main flame port 35 in the center, and a plurality of auxiliary flame holes 37 near the heat recovery tube 36 of the vaporizing tube 15 on the outer periphery.
have.

38 is an ignition electrode facing toward the burner head 25 from a part of the combustion ftJ3.

Reference numeral 39 denotes a flame rod for combustion detection that is attached to a part of the combustion tube 3 so as to be located in the main flame a in front of the burner head 25.

Further, b is an auxiliary flame.

In the above configuration, at the start of combustion, the sheathed heater 16 is first energized to heat the vaporization tube 15.

When the temperature of the vaporizer cylinder 15 rises to a set temperature sufficient to vaporize the liquid fuel, a burner thermometer (not shown) is turned on and the motor 4 is started.

Then, as the motor shaft 5 rotates, the turbo fan 8, cone 19, rotating plate 20, and mixing plate 21 also rotate.

When the turbo fan 8 generates wind pressure, the combustion air passes through the air intake hole 6 → the inside of the motor case 1 → the communication hole 7 → the air blowing chamber 10, and is divided into two parts in the distribution chamber 14, one of which is the primary air. Secondary air enters the primary air chamber 18 which passes through the air supply 12 and enters the vaporization chamber 17 .

The combustion pump is then activated and liquid fuel is supplied onto the cone 19 through the liquid fuel supply pipe 22.

Since the cone 19 has a conical shape, the liquid fuel supplied onto the cone 19 is caused by rotational centrifugal force.
The particles move toward the larger diameter side, then proceed along the rotary plate 20, and are scattered toward the outer circumference at the outer peripheral end of the rotary plate 20.

At this time, the liquid fuel spreads as a thin oil surface, but is finely divided by the mixing plate 21 rotating on its outer periphery, becomes atomized fuel of fine particles, and flies toward the inner peripheral surface of the vaporizer cylinder 15. go.

Since the vaporization tube 15 has already been heated as described above, the atomized fuel instantly becomes vaporized fuel.

On the other hand, since the primary air is sent into the vaporization cylinder 15 from the secondary air population 12, the vaporized fuel and secondary air are mixed to form a mixed gas flow.

The mixed gas flow is as follows: through opening 33 of helad body 26 → through opening 34 of rectifying plate 27 → porous flame hole plate 28 → flame holding plate 29
It passes through the main flame hole 35 and auxiliary flame hole 37.

If the ignition electrode 38 is used to ignite the flame, the burner head 25 will emit a blue main flame a and an auxiliary flame.

On the other hand, the secondary air sent to the secondary air chamber 18 is
The secondary air passing through the secondary air passage 31 passing through the secondary air passage 32 of the head body 26, and exiting from the central secondary air outlet 30 is sent into the center of the main flame a in parallel with the main flame a.

Therefore, the secondary air and the main flame a are mixed smoothly and well.

The combustion detection flame rod 39 is made of rawhide of the main flame a.
Detects that combustion is in progress.

In addition, the heat recovery tube 36 of the vaporization tube 15 is heated by the main flame a and the auxiliary flame, and the entire vaporization tube 15 is kept at a high temperature. The power supply to the heater 16 is stopped to save power.

Further, in the embodiment shown in FIG. 2, the opening diameter of the secondary air outlet 30 is increased as it approaches the porous flame hole plate 28, so that the outlet of the secondary air is expanded outward.

The most important configuration in the first and second embodiments is that the secondary air outlet 30 is installed on the windward side of the porous burner plate 28 without penetrating it. The effects of both of the above embodiments will be mainly described.

(2) If the secondary air outlet 30 penetrates the porous flame hole plate 2B, the combustion flame will be divided by the secondary air flow, causing noise.

Therefore, if the secondary air outlet 30 is provided to blow out the secondary air without penetrating the porous flame hole plate 30 as in both of the above embodiments, the secondary air flow is diffused in multiple directions by the porous flame hole plate 28. As a result, it mixes easily with the air mixture flow, and the combustion flame is not divided into wind noise or flame vibration noise, which reduces combustion noise.

(2) Since the secondary air outlet 30 is not exposed to the main flame port 35, a flame is formed widely over the entire area of the porous flame hole plate 28 within the main flame port 35.

In other words, since the ejection area of the air-fuel mixture is expanded, the overall ejection flow velocity of the air-fuel mixture is reduced, and as a result, the vibration noise of the flame, the wind noise of the flame hole, etc., which are caused by the high ejection flow velocity, are reduced. In this respect as well, combustion noise is reduced.

In the above embodiments, the liquid fuel is atomized and then vaporized and combusted, but the present invention can also be applied to various city gases, gaseous fuels such as propane, and the like.

As described above, according to the present invention, combustion noise is extremely low.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a combustion device according to an embodiment of the present invention, and FIG. 2 is a sectional view of a main part of a combustion device according to another embodiment of the invention. 4...Motor, 8...Turbo fan, 15...Carbonizer cylinder, 19...Cone, 20...Rotating plate, 21...
・Mixing plate, 27... Straightening plate, 28... Porous flame hole plate, 29... Flame holding plate, 30... Secondary air outlet, 35
...Main flame port, 37...Auxiliary flame port, a...Main flame, b
...Auxiliary flame.

Claims (4)

[Scope of utility model registration request] (1) A burner head that burns a mixed air flow of fuel and primary air, and a secondary air outlet provided opposite to the main flame port of the burner head, the secondary air outlet being the main flame port. A combustion device characterized by opening closer to the air-fuel mixture flow side. (2) A utility model characterized in that the burner head is constructed by stacking a rectifying plate having openings, a porous flame hole plate, and a flame holding plate having a main flame port in order from the upstream side of the mixed air flow. A combustion device according to registered claim 1. (3) The combustion device according to claim 2, wherein the secondary air outlet passes through the opening of the baffle plate and is brought into close contact with the porous flame hole plate. (4) The combustion device according to claim 3, wherein the opening area of the secondary air outlet increases as it approaches the porous flame hole plate.