TWI920305B - Furnace burner - Google Patents

Abstract

This invention provides a burner for a stove, which is a burner for a stove with two layers of flame openings, comprising: a burner body (1) having three inner and outer cylindrical layers; a lower burner cap (2) dividing the lower flame opening (4L) between the lower burner cap (2) and the outer cylindrical layer (11) of the burner body (1); and an upper burner cap (3) dividing the upper flame opening (4L) between the upper burner cap (2) and the lower burner cap (3). The upper flame port (4U) and the lower flame port (4L) each have a flame port located at one position in the circumferential direction, forming an ignition port (4I). Ignition performance is improved by spark discharge between the target portion (24) above the ignition port (4I) located on the lower burner cap (2) and the ignition electrode (7), thereby igniting the mixture ejected from the ignition port (4I).

The burner of this invention has a pair of ribs (25) located at two circumferentially separated positions, separated by the ignition port (4I). One rib protrudes from the inner circumference of the lower burner cap (2) and the outer cylinder (11) of the burner body (1), and abuts against or approaches the other rib, and is longer vertically.

Description

Furnace burner

This invention relates to a burner for a furnace having two layers of flame openings.

Traditionally, the following technologies are known for burners used in such stoves: a burner body having "three layers of cylinders: an outer cylinder, a middle cylinder, and an inner cylinder"; an annular lower burner cap having "a cylindrical portion fitted into the middle cylinder of the burner body, hanging vertically on the inner circumference, and having several lower flame openings divided in a circumferentially spaced area between it and the outer cylinder of the burner body"; and a cylindrical portion "fitted into the inner cylinder of the burner body, hanging vertically on the inner circumference, and having several lower flame openings divided in a circumferentially spaced area between it and the outer cylinder of the burner body". Between the lower burner caps, there are annular upper burner caps with multiple upper flame ports divided by circumferential intervals. A mixture is supplied to the lower flame ports through a mixing chamber surrounded by the outer and middle cylinders of the burner body and the lower burner caps. A mixture is also supplied to the upper flame ports through a mixing chamber surrounded by the middle and inner cylinders of the burner body and the lower and upper burner caps (for example, see Patent 1). Furthermore, in this technology, a flame port located at one position circumferentially within the lower flame ports constitutes an ignition port. Then, the target portion located above the ignition port is placed on the burner cap, and the mixture ejected from the ignition port is ignited by the spark discharge between the ignition electrode configured to face the target portion and the target portion.

In the conventional burner described above, the gas mixture typically flows into the lower flame mixing chamber at a position away from the ignition nozzle in the circumferential direction with a motion component that is inclined in the radial direction passing through that position. Therefore, in the lower flame mixing chamber, the gas mixture swirls and flows into the ignition nozzle with an vortex component. As a result, the gas mixture is ejected from the ignition nozzle in a direction inclined in the circumferential direction. Then, the ejected gas mixture leaks out through the discharge gap between the ignition electrode and the target, easily leading to poor ignition. [Prior Art Documents] [Patent Documents]

[Patent Document 1] Japanese Patent Application Publication No. 2019-143959

[Problem to be Solved by the Invention] In view of the above problems, the subject of this invention is to provide a burner for a stove with upper and lower two-layer flame nozzles, which can improve ignition performance. [Means of Solution]

To solve the above problems, the present invention provides a furnace burner with two layers of flame openings, comprising: a burner body having three layers of cylinders: an outer cylinder, a middle cylinder, and an inner cylinder; and an annular lower burner cap with a cylindrical portion that is vertically fitted into the middle cylinder of the burner body on its inner circumference, and a circumferential gap between the cap and the outer cylinder of the burner body. The upper burner cap is divided into several lower flame ports by circumferential intervals. A cylindrical portion, fitted into the inner cylinder of the burner body, is vertically arranged on its inner circumference. Between the upper burner cap and the lower burner cap, several upper flame ports are divided by circumferential intervals. The lower flame ports are supplied with gas through a mixing chamber surrounded by the outer cylinder, middle cylinder, and lower burner cap of the burner body. The mixture is supplied to the upper flame nozzle through the mixing chamber of the middle and inner cylinders of the burner body, the lower burner cap, and the upper burner cap. A flame nozzle located at one position in the circumferential direction within the lower flame nozzle constitutes the ignition port. A target portion is provided above the ignition port on the lower burner cap, and an ignition electrode is configured to face the target portion. The spark discharge between the target and the ignition of the mixture ejected from the ignition port is characterized by the following: the mixing chamber of the lower flame port is provided with a pair of ribs that are separated in the circumferential direction from the inner circumference of the lower burner cap and the outer cylinder of the burner body, and protrude from one of them and abut or approach the other, and are longer in the vertical direction.

According to this invention, even if the gas mixture swirls in the lower flame mixing chamber, the gas mixture, having had its vortex component removed, flows upwards from below through the space between a pair of ribs and then into the ignition port. The gas mixture is then ejected from the ignition port without tilting circumferentially in the radial direction. As a result, the ejected gas flow from the ignition port does not leak from the discharge gap between the ignition electrode and the target, thus improving ignition performance.

Referring to Figures 1 to 4, the stove burner of the present invention is a burner with upper and lower two-layer flame nozzles, which will be described later, and includes a burner body 1, a lower burner cap 2, and an upper burner cap 3. The burner body 1 is made of sheet metal and has three layers of cylinders: an outer cylinder 11, a middle cylinder 12, and an inner cylinder 13. The lower burner cap 2 is annular, and a cylindrical portion 21 is vertically provided on its inner circumference, fitting into the middle cylinder 12 of the burner body 1. The upper burner cap 3 is annular, and a cylindrical portion 31 is vertically provided on its inner circumference, fitting into the inner cylinder 13 of the burner body 1. Then, between the outer cylinder 11 of the burner body 1 and the lower burner cap 2, there are several lower flame ports 4L in a circumferentially spaced area, and between the lower burner cap 2 and the upper burner cap 3, there are several upper flame ports 4U in a circumferentially spaced area.

Specifically, an annular wall 22 is vertically provided on the outer periphery of the lower surface of the burner cap 2, positioned at the upper end of the outer cylinder 11 of the burner body 1. An inwardly bent flange 11a is formed at the upper end of the outer cylinder 11, and the annular wall 22 is positioned on this inwardly bent flange 11a. The annular wall 22 has numerous grooves, spaced circumferentially, forming a lower flame nozzle 4L that is recessed upwards from its lower end. The lower ends of these grooves are then sealed by the inwardly bent flange 11a, thereby creating a lower flame nozzle 4L that is defined between the outer cylinder 11 and the burner cap 2. In the section located in the same position as the "multiple trivet pawls of the trivet (omitted in the diagram)", in order to prevent the flame from contacting the trivets and causing incomplete combustion, only the lower flame 4L is formed, and the upper flame 4U is not formed.

The upper flame 4U is divided into two parts: an upper flame 4Ua and a lower flame 4Ub. Specifically, an annular wall 23 is erected on the outer periphery of the upper surface of the lower burner cap 2, and grooves are formed in large quantities on the annular wall 23 with circumferential intervals, forming the "lower flame 4Ub of the upper flame 4U recessed downward from its upper end". Furthermore, an annular wall 32, which is placed on the annular wall 23, is vertically disposed on the outer periphery of the lower surface of the upper burner cap 3. Numerous grooves are formed on the annular wall 32, forming "upper flame opening portions 4Ua" that are recessed upwards from their lower ends into the upper flame opening 4U. These grooves are spaced circumferentially apart, and their positions are offset circumferentially relative to the lower flame opening portions 4Ub. Thus, between the lower burner cap 2 and the upper burner cap 3, the upper flame opening portions 4Ua and the lower flame opening portions 4Ub are offset circumferentially, forming a grid-like pattern.

The burner for the furnace further features a pair of mixing tubes 5U and 5L extending nearly parallel to the side of the burner body 1 for the upper and lower flame ports. Next, the mixed gas from the lower flame mixing pipe 5L is supplied to the lower flame 4L through the lower flame mixing chamber 6L surrounded by the outer cylinder 11, the middle cylinder 12, and the lower burner cap 2 of the burner body 1. The mixed gas from the upper flame mixing pipe 5U is supplied to the upper flame 4U through the upper flame mixing chamber 6U surrounded by the middle cylinder 12, the inner cylinder 13, the lower burner cap 2, and the upper burner cap 3 of the burner body 1.

Furthermore, among the lower flame ports 4L, the flame port located at one position in the circumferential direction, that is, the flame port located in the opposite position to the "extension position of the mixing tube 5U of the upper flame port", constitutes the ignition flame port 4I. Referring to Figure 6, the ignition flame port 4I is composed of the main ignition flame port 4Ia and its two side auxiliary ignition flame ports 4Ib, 4Ib. In addition, a target portion 24 is provided on the outer peripheral surface of the annular wall 23 of the lower burner cap 2, "located above the main ignition flame port 4Ia". On the outer side of the burner body 1, an ignition electrode 7 is arranged facing the target portion 24. Then, by discharging the spark between the ignition electrode 7 and the target 24, the mixture ejected from the ignition port 4I, or more precisely, the mixture ejected from the main ignition port 4Ia, is ignited, and the ignited flame is transferred to the adjacent lower flame port 4L through the secondary ignition port 4Ib.

The upper burner cap 3 is provided with an eaves part 33 extending radially outward above the ignition electrode 7, which prevents boiling soup from splashing onto the ignition electrode 7. In addition, a thermocouple 8 for detecting the flame is disposed separately from the ignition electrode 7 on the outer side of the burner body 1 in a slightly circumferential direction.

Incidentally, the gas mixture, at the position where it separates from the ignition port 4I in the circumferential direction, flows into the lower flame mixing chamber 6L with a motion component that is inclined in the radial direction passing through that position (the length direction of the lower flame mixing tube 5L). Therefore, the gas mixture swirls in the lower flame mixing chamber 6L, and there is a possibility that the gas mixture will flow into the ignition port 4I as a swirling component. Then, once the gas mixture flows into the ignition port 4I as a swirling component, the mixer will eject it from the ignition port 4I in a direction inclined in the circumferential direction. As a result, the ejected gas mixture leaks out from the discharge gap between the ignition electrode 7 and the target 24, easily leading to poor ignition.

In view of this, in this embodiment, a pair of ribs 25, 25 are provided in the mixing chamber 6L of the lower flame port. These ribs 25, 25 are located at two separate circumferential positions, separated from the ignition flame port 4I. They protrude from the inner circumference of the cylindrical portion 21 of the lower burner cap 2 and approach the outer cylindrical body 11 of the burner body 1, and are longer in the vertical direction. The outer cylindrical body 11 is provided with a cylindrical drooping edge 11b that hangs down from the inner circumference of the inwardly bent flange portion 11a from the upper end. Then, as shown in FIG. 5, each rib 25 approaches the cylindrical drooping edge 11b. Furthermore, although the upper part of each rib 25 reaches the lower surface of the burner cap 2 and the inner circumferential surface of the annular wall 22, it may not reach the lower surface of the burner cap 2 or the inner circumferential surface of the annular wall 22, thus forming a certain gap between the two. In addition, although in this embodiment the circumferential position of the inner circumferential surface of each rib 25 is consistent with the circumferential outer circumferential surface of the ignition port 4I (specifically, the circumferential outer circumferential surface of the secondary ignition port 4Ib), the position of the inner circumferential surface of each rib 25 may also be slightly offset from the circumferential outer circumferential surface of the ignition port 4I towards the circumferential outer side.

By providing the pair of ribs 25, 25 as described above, the gas mixture, with vortex components removed, flows upward from below through the space between the ribs 25, 25, and then flows into the ignition port 4I. The gas mixture is then ejected from the ignition port 4I in a radial direction without tilting in the circumferential direction. As a result, the ejected gas flow from the ignition port 4I does not leak from the discharge gap between the ignition electrode 7 and the target 24, thus improving ignition performance.

While the embodiments of the invention have been described above with reference to the figures, the invention is not limited to these embodiments. For example, although in the above embodiments, each rib 25 is close to the cylindrical drooping edge 11b of the outer cylinder 11 of the burner body 1, each rib 25 can also abut against the cylindrical drooping edge 11b. Furthermore, although in the above embodiments the burner body 1 is made of sheet metal, at least the outer cylinder 11 of the burner body 1 can also be a cast product, with a pair of ribs protruding from the outer cylinder 11 and approaching or abutting against the inner circumference of the lower burner cap 2 at two circumferentially separated positions of the ignition port 4I.

1: Burner body 11: Outer cylinder 11a: Inwardly bent flange 11b: Cylindrical drooping flange 12: Middle cylinder 13: Inner cylinder 2: Lower burner cap 21: Cylinder 22: Annular wall 23: Annular wall 24: Target 25: Rib 3: Upper burner cap 31: Cylinder 32: Annular wall 33: Eaves 4L: Lower flame nozzle 4U: Upper flame nozzle 4Ua: Upper flame nozzle portion 4Ub: Lower flame nozzle portion 4I: Ignition port 4Ia: Main ignition port 5L: (For lower flame nozzle) Mixing tube 5U: (For upper flame nozzle) Mixing tube 6L: Mixing chamber for lower flame nozzle; 6U: Mixing chamber for upper flame nozzle; 7: Ignition electrode.

[Figure 1] Three-dimensional view of the furnace burner of the present invention. [Figure 2] Top view of the furnace burner of the present invention. [Figure 3] Cross-sectional view taken along line III-III in Figure 2. [Figure 4] Cross-sectional view taken along line IV-IV in Figure 2. [Figure 5] Enlarged cross-sectional top view of the important part taken along line V-V in Figure 4. [Figure 6] Three-dimensional view of the burner cap below the furnace burner of the present invention, seen from a slightly lower angle.

2: Bottom burner cap

3: Burner cap

4I: Ignition Flame Port

4Ia: Main flame vent

4L: Lower Flame Portion

4U: Upper flame nozzle

4Ua: Upper flame nozzle section

4Ub: Lower flame nozzle section

5U: (For upper flame nozzle) Mixing tube

6L: Mixing chamber for lower flame nozzle

6U: Mixing chamber for upper flame nozzle

7: Ignition electrode

11: Outer cylinder

11a: The inwardly curved flange.

11b: Tubular drooping edge

12: Middle cylinder

13: Inner cylinder

21: Cylindrical section

23: Circular wall

24: Target area

25: Ribs

32: Circular wall

33: Eaves

Claims (1)

A furnace burner, comprising two layers of flame openings (upper and lower), includes: a burner body having three cylindrical layers: an outer cylinder, a middle cylinder, and an inner cylinder; an annular lower burner cap with a cylindrical portion vertically fitted into the middle cylinder of the burner body on its inner circumference, and several lower flame openings formed by circumferentially spaced areas between the lower burner cap and the middle cylinder of the burner body; an annular upper burner cap with a cylindrical portion vertically fitted into the inner cylinder of the burner body on its inner circumference, and several upper flame openings formed by circumferentially spaced areas between the upper burner cap and the upper burner cap; A mixture is supplied to the lower flame nozzle through a mixing chamber surrounded by the outer cylinder, middle cylinder, and lower burner cap of the burner body. A mixture is also supplied to the upper flame nozzle through a mixing chamber surrounded by the middle cylinder, inner cylinder, lower burner cap, and upper burner cap. Among the lower flame nozzles, one nozzle located at a position in the circumferential direction constitutes an ignition port. A target portion positioned above the ignition port is placed on the lower burner cap. The mixture ejected from the ignition port is ignited by an ignition electrode configured to face the target and a spark discharge between the electrode and the target. Its characteristics are: The lower flame nozzle mixing chamber is provided with: a pair of ribs, located at two circumferentially separated positions, separated by the ignition nozzle. These ribs protrude from one of the inner circumference of the lower burner cap and the outer cylinder of the burner body, and abut or approach the other rib, with the rib being longer vertically.