JPH0461247B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a burner for gas fuel, and particularly to a burner for use with city gas or gas in cylinders for domestic or industrial use.

Traditionally, such gas burners have a simple structure,
It is highly reliable, safe, and inexpensive, and these advantages are widely known, but at the same time, it also has the following disadvantages. That is, they have the drawbacks of relatively low thermal efficiency, which usually does not exceed 55 to 60%, and air pollution caused mainly by carbon monoxide produced due to incomplete combustion. Low thermal efficiency is caused by the fact that there is nothing to control the spread of the flame, so the heat radiation area of the flame becomes too large, too much air is sucked in from the surrounding area, and the effective heat exchange area between the flame and the heated surface is small. This is due to the low exchange rate. Incomplete combustion, on the other hand, occurs because the flame in contact with the heated surface is relatively short and excessively cooled.

The present invention was made in view of the above circumstances, and
The purpose is to provide a burner capable of creating a centrally concentrated combustion zone with a rotating vertical flame column, which sucks in secondary air depending on the ejection velocity of the combustion gas-primary air mixture. Therefore, the excess air ratio is reduced, combustion is promoted in this way, the heat exchange rate is increased, and excess heat radiation can be reduced.

The gas burner of the present invention has a full chamber in which combustion gas ejected from a normal nozzle and primary air are put in to form a mixture thereof, and the upper part of this full chamber has a plurality of comparative chambers for the above-mentioned mixture. It is covered by a roof member having a narrow passageway, which passageway is formed upwardly and inwardly from the plenum to the external upper surface of the gas burner, and which passageway is oriented relative to the vertical axis of the gas burner. It is characterized by forming a predetermined angle with a perpendicular plane, and that the vertical plane containing each passage is in contact with an imaginary cylinder passing through the center of the gas burner.

This rotating flame is created by the interaction of multiple jets of mixture of combustion gases and primary air expelled from the plenum with passages that guide the jets of mixture not only tangentially but also upward and inward. . When this fire hits a flat object to be heated, the nearly spiral fire spreads out in a radial spiral along the flat surface, forming multiple branch flames. The length of this branched flame is longer than the length of the flame of a conventional gas burner when it hits the same object to be heated, which improves the heat exchange rate and reduces heat transfer loss.

Separate tests at several authoritative institutions have shown that the gas burner of the present invention has a 20-30% increase in thermal efficiency compared to conventional gas burners.

Preferred embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a first embodiment of a gas burner according to the invention, in which a burner body 2 is mounted on a conventional bench lily and nozzle unit (not shown);
is combined with the roof plate 4 to form a filling chamber 6. Note that it is preferable that the roof plate 4, which is a roof member, be detachably attached to the burner body 2 in order to facilitate cleaning of the entire gas burner. The roof plate 4 is provided with a passage for rotating and discharging the air-fuel mixture, and in this embodiment, a plurality of equally spaced holes 8 having a circular cross section form the passage. As shown in FIG. 1, the hole 8 extends upwardly and inwardly from the filling chamber 6 and penetrates the upper surface of the roof shingle 4.
The angle β of these holes 8 with the horizontal plane is 15° to 40°.
It is best to be somewhere in between. Further, as shown in FIG. 2, the vertical plane passing through the center line of the hole 8 is not a plane extending in the radial direction, but is in contact with the virtual vertical cylinder 10. The angle α between the vertical plane passing through the central axis of the hole 8 and the vertical plane extending in the radial direction and passing through the center of the opening on the filling chamber 6 side of the corresponding hole 8 is optimally between 10° and 35°. It is.

As mentioned above, the "double slant" of hole 8, i.e., the inclination indicated by angles α and β, creates a rotating vertical flame column, or flame vortex, and the low pressure zone of this flame vortex sucks in secondary air. Half of the air required for combustion is provided by this secondary air, and the remaining half of the air is provided by the primary air sent into the full chamber 6 together with the combustion gas.

3 to 5 show a second embodiment of the gas burner of the present invention. The burner body 2 is basically the same as the burner body of the first embodiment. However, the passage for the mixture of combustion gas and primary air formed in the roof sheet 4 is not a hole, but a groove 12 formed in the tapered surface of the roof sheet 4.
This embodiment differs from the first embodiment in this point. In this embodiment, as is clear from the shape of the intersection of the top surface 14 of the roof board 4 and the groove 12, the bottom of the groove 12 has a circular cross section. The groove 12 is covered by a cover plate 16 having a tapered inner surface 18 that matches the tapered surface of the roof shingle 4, forming a passage for the air-fuel mixture. This embodiment is also characterized in that the passage for the mixture of combustion gas and primary air has a "double slant" indicated by angles α and β. Furthermore, the fifth
The figure shows a virtual vertical cylinder 10 for defining the angle α.

6 and 7 show a third embodiment of the gas burner of the present invention. This embodiment has the same gas burner as shown in FIGS. 1 and 2, but also has the following two new features. One of these is a plurality of fins 20 arranged on the upper outer surface of the gas burner along a vertical plane that is in contact with the virtual vertical cylinder 10 and passes through the center line of the hole 8 . This fin 20 is
The secondary air sucked in by the rotating flame as described above is preheated and guided to flow along it. Another feature is a plurality of relatively thin pins 22 mounted on the shingle 4 near the point where the hole 8 intersects the top surface of the shingle 4. These pins 22 are made of a material that has catalytic properties to promote the combustion of carbon monoxide, such as a high temperature alloy containing certain heavy metals such as nickel, chromium, etc.

We have already pointed out the effect when the rotating flame hits the bottom of an object to be heated such as a pan and spreads out in a flat spiral radial pattern, but some gas ranges have a grating to support the pan etc. In some cases, the grate forms horizontal arms that extend to the center of the bottom of the pan, preventing the flame from spreading in a spiral radial pattern. In such a case, attach multiple relatively thin (4 to 5 mm diameter) vertical rods to the burner body 2 along a circle approximately the same size as the gas burner diameter, or
By forming it integrally with the burner body 2 to support a pan or the like, rotation of the flame can be prevented so much.

In the gas burner shown in these figures,
Although no lighter is shown, such a lighter can be easily attached to the gas burner of the present invention. For example, in the embodiment shown in FIGS. 1 and 2, an opening passing through the burner body 2 and the roof plate 4 is provided between the collar-shaped protruding portion of the burner body 2 and the circularly arranged holes 8. You can also pass a lighter through it. Then, it is only necessary to make the tip of the lighter protrude from the upper surface of the roof board 4. A similar configuration can be used in each of the other embodiments depending on the shape of each.

[Brief explanation of the drawing]

1 and 2 show a first embodiment of the gas burner of the present invention, with FIG. 1 being a sectional view and FIG. 2 being a plan view. 3 to 5 show a second embodiment of the gas burner of the present invention, in which FIG. 3 is a sectional view, FIG. 4 is a plan view, and FIG. 5 is a plan view of a roof board. 6 and 7 show a third embodiment of the gas burner of the present invention, FIG. 6 is a sectional view, and FIG.
The figure is a plan view. 2...burner body, 4...roof plate, 6...
Filling chamber, 8... Hole, 10... Virtual vertical cylinder, 12
...Groove, 16...Cover plate.

Claims (1)

[Scope of Claims] 1. Consists of a body having a filled chamber in which combustion gas introduced from a nozzle and primary air are mixed, and an upper part of this filled chamber contains a plurality of chambers for a mixture of the combustion gas and primary air. covered by a roof member having a relatively narrow passageway extending upwardly and inwardly from the fill chamber toward the outer surface of the nape of the body and extending in a plane perpendicular to the vertical axis of the body; each of the planes forming a predetermined angle with respect to the body, each of which includes each of the passages and which is parallel to the vertical axis, is in contact with the outer periphery of an imaginary vertical cylinder passing through the center of the body, so that the concentration A gas burner configured to produce a rotating flame. 2. The gas burner according to claim 1, wherein the passage is a hole provided in the roof member. 3. The gas burner according to claim 1, wherein the passage is formed by a groove formed on the upper surface of the roof member and a cover plate covering the groove. 4. Claims characterized in that the upper outer surface of the body is provided with fins for guiding and preheating secondary air, which are arranged along a plane parallel to the vertical axis and in contact with the virtual vertical cylinder. The gas burner according to item 1. 5. A plurality of relatively thin pins are attached to the upper outer surface of the body near the point where the passageway intersects with the upper outer surface of the body, the pins serving as a catalyst to promote the complete combustion of carbon monoxide. Gas burner according to claim 1, characterized in that it is made of a material having the following properties: