GB2068527A

GB2068527A - Infrared radiation gas burner plate

Info

Publication number: GB2068527A
Application number: GB8003623A
Authority: GB
Original assignee: Rinnai Corp
Current assignee: Rinnai Corp
Priority date: 1980-02-04
Filing date: 1980-02-04
Publication date: 1981-08-12
Also published as: GB2068527B

Abstract

An infrared radiation gas burner plate composed chiefly of ceramic material and provided with a plurality of burner holes (2) therethrough. Ribs (5) of substantially V-shaped section each comprises a linear ridge (3) and two opposed slanting surfaces (4) one either side of the ridge, the ribs (5) being parallel to one another on the obverse surface of the plate (1). Facing slanting surfaces (4) and surfaces connecting their lower margins together define parallel chanel-sectioned grooves (6) and the burner holes are so arranged that some of them (2a) are disposed as central burner holes in a line in each groove (6) while other burner holes (2b) are disposed in the slanting surfaces (4) in such manner that four such holes surround each central burner hole and are disposed in the slanting surfaces (4) so that, if an imaginary line is drawn at right angles to the ridges (3) and passes through one of the central burner holes (2a), then the burner holes (2b) do not lie on this imaginary line. <IMAGE>

Description

SPECIFICATION Infrared radiation gas burner plate The invention relates to infrared radiation gas burner plates and more particularly to burner plates that are composed chiefly of ceramic material and are provided with a plurality of burner holes therethrough.

Known burner plates of this type have several deficiencies. For example, often the time required for increasing the temperature is too long while other plates lack the proper radiant efficiency.

Some produce a loud burning noise which, of course, is undesirable. Furthermore, some of the known burners are unstable, especially under changes of pressure of the gas supply or other variations in ambient conditions.

According to the present invention, there is provided an infrared radiation gas burner plate composed chiefly of ceramic material and provided with a plurality of burner holes therethrough; a plurality of ribs, each of which is substantially V-shaped in section to comprise a linear ridge and two opposed slanting surfaces one either side of the ridge, being provided parallel to one another on the obverse surface of the plate; facing slanting surfaces and surfaces connecting their lower margins together defining parallel channel-sectioned grooves, said burner holes being so arranged that some of them are disposed as central burner holes in a line in the base of each groove while other burner holes are disposed in said slanting surfaces in such manner that four such holes surround each central burner hole and are disposed in said slanting surfaces so that, if a line is drawn at right angles to the ridges and passes through one of said central burner holes, said four other surrounding burner holes do not lie on said line.

For a better understanding of the invention and to show, how the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawings, in which: Figure 1 is a plan view of a burner plate, Figure 2 is a sectional view taken along the line Il-Il in Figure 1, Figure 3 is a sectional view taken along the line Ill-Ill in Figure 1 and Figure 4 is a plan view of another form of burner plate.

Referring to the drawing, the infrared radiation gas burner plate is generally designated by reference numeral 1. The plate 1 is composed chiefly of ceramic material and is provided with a large number of evenly-distributed burner holes 2 which extend from one side of the plate 1 to the other.

A plurality of ribs 5, each of which is substantially V-shaped in section to comprise a linear ridge 3 and two opposed slanting surfaces 4, 4 one either side of the ridge 3, are provided parallel to one another on the obverse surface of the plate 1, the obverse surface being the surface at which the gas is intended to burn. Facing slanting surfaces 4, 4, between each adjacent pair of ribs 5, 5 are connected together at their lower margins by surfaces defining parallel channel sectioned grooves 6, each groove 6 accordingly lying below the lower margins of the slanting surfaces 4. The ribs 5 and the grooves 6 may be parallel with both side edges of the plate 1, which is rectangular, as shown, for example, in Figure 1, or may be oblique thereto as shown, for example, in Figure 4.

The burner holes 2 can be categorised into two types, viz. burner holes 2a in each groove 6 and burner holes 2b in the slanting surfaces 4. The burner holes 2a are disposed in a line in each groove 6 while the burner holes 2b are disposed in the slanting surfaces 4 in such manner that four such holes surround each burner hole 2a and are disposed in the slanting surfaces 4 so that, if a line is drawn at right angles to the ridges 3 and passes through one of the burner holes 2a, the burner holes 2b do not lie on this line. In fact, the burner holes 2a, 2b an one side of each ridge 3 and the burner holes 2a, 2b on the others side thereof are differentiated in phase by half a pitch.

Consequently, there is formed in the burner plate 1 such a long zone that, as shown clearly in Figures 2 and 3, a first section A is provided in which there is a central burner hole 2a in the groove 6 but there are no other burner holes 2b, 2S in the mutually opposed slanting surfaces 4, 4, and a second section B in which there is no central burner hole 2a in the groove 6 but there are the other burner holes 2b, 2b in the mutually opposed -slanting surfaces 4, 4.

Operation of the burner plate will now be explained. Gas is so supplied to the reverse (rear) surface of the plate 1 as to flow out through each burner hole 2 and be burned over the obverse surface thereof. If the first section A is considered, the groove 6 serves as a false burner hole at that section. If the gas is quick to ignite, the gas will be burned at the base 6a of the groove 6 but if the gas is slow to ignite, it will burn at an open portion 6b above the groove 6. Thus, in either case, the gas is always burned at the groove 6, which is therefore able to adapt to any change in gas pressure. Furthermore, due to this gas distribution, the burning area is increased.

If the section B is considered, the gas is burned in a space formed between the facing slanting surfaces 4, 4 and consequently a comparatively wide burning area is produced. It will be seen that burning of gas at each section B compensates for a dark portion at each adjacent section A and, as a result, the entire obverse surface of the burner plate becomes red-hot quickly and a uniform red hot burning is produced. Furthermore, eddies and pressure changes caused thereby which become a cause of burning noise are distributed in the longitudinal direction of each groove 6, resulting in a notable decrease in the generation of burning noise as compared with conventional burner plates.

According to experiments, it has been confirmed that the depth of each groove should be about half the diameter of each burner hole and that it is optimum for the size of each burner hole 2 to be about 1 mm in diameter regardless of kinds of gases, and so it is desirable that the depth of each groove 6 is 0.5 mm or more.

It will be appreciated that the present burner plate with the arrangement of burner holes as defined can produce a stable burning condition regardless of change in gas pressure or in type of gas used and uniform red head can be achieved quickly.

Claims

1. An infrared radiation gas burner plate composed chiefly of ceramic material and provided with a plurality of burner holes therethrough; a plurality of ribs, each of which is substantially V-shaped in section to comprise a linear ridge and two opposed slanting surfaces on either side of the ridge, being provided parallel to one another on the obverse surface of the plate; facing slanting surfaces and surfaces connecting their lower margins together defining parallel channel-sectioned grooves, said burner holes being so arranged that some of them are disposed as central burner holes in a line in the base of each groove while other burner holes are disposed in said slanting surfaces in such a manner that four such holes surround each central burner hole and are disposed in said slanting surfaces so that, if a line is drawn at right angles to the ridges and passes through one of said central burner holes, said four other surrounding burner holes do not lie on said line.

2. A gas burner plate as claimed-in claim 1, wherein it is substantially rectangular and said ribs and grooves are parallel to two opposed side edges of it.

3. A gas burner plate as claimed in claim 1, wherein it is rectangular and said ribs and said grooves are obliquely positioned to two opposed side edges of it.

4. A gas burner plate as claimed in claim 1, 2 or 3, wherein the depth of each said groove is substantially half the diameter of each said burner hole.

5. A gas burner plate as claimed in claim 4, wherein each burner hole is substantially 1 mm in diameter and each groove is 0.5 mm or more in depth.

6. An infrared radiation gas burner plate, substantially as hereinbefore described, with reference to Figures 1 to 3, with or without the modification of Figure 4 of the accompanying drawing.