JPS6119297Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a gas infrared combustion plate of the type in which a large number of flame holes are drilled through the plate body, which is mainly made of ceramic or other heat-resistant material and is fired, passing through the front and back sides. Conventionally, in this kind of combustion plate, as shown in FIG. 1, for example, the flame hole b is a triangle drawn by a line segment connecting the centers of three adjacent flame holes b, which are formed in the flame hole b formed in the plate body a. Concave grooves c are arranged to form a substantially regular triangle whose height is greater than the diameter of the plate a, and which form a diamond shape on the surface of the plate a.
A large number of grooves c are arranged side by side, and a diamond-shaped convex portion d
According to this, each convex portion d
The flame hole B inside the flame hole B and the flame hole B in the concave groove C on the outer periphery heat the flame in a short time to become red hot, and the advantage is that heat radiation occurs more quickly than in the conventional combustion plate which forms a concave depression on the plate surface. There is. The purpose of the present invention is to improve this and provide a combustion plate that can heat up even more quickly. Hole 2
A large number of flame holes 2 are arranged so that the height of the triangle drawn by the line segments connecting the centers of three adjacent flame holes 2 is larger than the diameter of the flame holes 2, A large number of concave grooves 3 are formed on the surface of the plate 1, forming a triangle similar to the regular triangle and having three flame holes 2 in the middle of each side and one flame hole 2 at each vertex position. Books are arranged side by side, and a substantially regular triangular convex portion 4 having three flame holes 2 inside is formed between each concave groove 3. Figures 2 and 3 show an example of this. In this case, the grooves 3 are formed in the vertical direction, which is the vertical direction when the combustion plate is installed in the combustor in an upright position, and in the vertical direction, which is approximately 60 mm.
The grooves 3 are formed in two diagonal directions forming a degree angle, so that the combustion exhaust gas in each groove 3 is smoothly exhausted upward through the vertical groove 3. Further, each convex portion 4 may be formed in the shape of a truncated triangular pyramid with sloped side surfaces as shown in FIGS. 4 and 5. Next, the proposed combustion plate and the conventional combustion plate will be compared and explained. The smaller the protrusions on both combustion plates are, the more easily they become red-hot, but if they are made too small, the area occupied by the grooves will increase, and the heat radiation efficiency of the entire combustion plate will actually decrease, so the maximum heat The size of the convex portion that provides radiation efficiency is determined automatically, and this is the case when the convex portion 4 of the combustion plate of the present invention has three flame holes 2 inside, and the size of the convex portion of the conventional combustion plate. Part d
In this case, the heat up performance of each convex part 4 and d in this case is compared. Heat-up becomes faster as the heating area of each convex part 4 and d per flame hole 2, b that contributes to heating of each convex part 4 and d is smaller. Here, the number of flame holes 2 contributing to the heating of the convex part 4 of the combustion plate of the present invention is 3 in the convex part 4 and 12 in the concave groove 3 surrounding the convex part 4, but Of the flame holes 2, the three flame holes 2 at the apex position are shared by the six convex parts 4 around it, and the three flame holes 2 in the middle of each side, a total of nine flame holes 2, are shared by two adjacent flame holes 2. The actual number of flame holes 2 per protrusion 4 is 3+3×1/6+9×1/2=8. In addition, the number of flame holes b that contribute to the heating of the convex portions d of the conventional combustion plate is such that each convex portion d has four flame holes b inside,
A total of 4 flame holes b at each vertex position shared by the four convex portions d, and a total of 8 flame holes b at the middle of each side shared by the two convex portions d.
Since it has 4 flame holes b, 4+4×1/4+8×1/2=9. Next, the heating area per flame hole is determined from FIG. If the height of the triangle drawn by line segments connecting the centers of three adjacent flame holes is a, the length of one side is 2b, and the radius of the flame hole is r, then the triangle will become the protrusion 4 of the proposed combustion plate.
The area of ABC is that its height AH is 5/2a, and one side of it is
Since the length of BC is 5b, it becomes 25/4ab, and the value obtained by subtracting the area of the three internal flame holes from this becomes the heating area of the convex part 4, and therefore the heating area per flame hole.
_S1 is _S1 =1/8(25/4ab− ^3πr2 )...(1). In addition, the area of the diamond-shaped ADFE, which is the convex part d of the conventional combustion plate, is such that the lengths of the diagonals AF and DE are 4a and 4b, respectively.
Therefore, it becomes 8ab, and the value obtained by subtracting the area of the four internal flame holes from this becomes the heating area of the convex part d. Therefore, the heating area S ₂ per flame hole is S ₂ = 1/9 ( 8ab−4πr ² ) ...(2). In order for the convex portion 4 of the proposed combustion plate to heat up faster than the convex portion d of the conventional combustion plate d, it is necessary that S ₂ > S ₁ , and the condition is 31/20πab > r ² ...(3). Here, the above-mentioned triangle drawn by connecting the centers of three adjacent flame holes is a substantially regular triangle, so
The following equation b≒a/√3......(4) holds true, and a is set to be greater than or equal to the diameter of the flame hole so that the flame hole inside and outside does not protrude from the contour line of the convex part. , the following equation a2r...(5) holds, and the minimum value on the left side of equations (4) and (5) to (3) is given by assuming a=2r. It can be seen that equation (3) is always satisfied. The table below shows the measured values of a, b, and r for each combustion plate using different types of gases, and the value of n expressed by the following formula.

[Table] As described above, according to the present invention, the convex portion 4 surrounded by the groove 3 is formed into a substantially regular triangle with three flame holes 2 inside, whereas the conventional method which forms a diamond-shaped convex portion The heating area of each convex portion 4 per flame hole 2 is reduced compared to the conventional one, and the heat-up of the convex portion 4 is accelerated.
This has the effect of causing heat radiation to occur more quickly.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a conventional combustion plate, Fig. 2 is a plan view of an example of the combustion plate of the present invention, and Fig. 3 is a plan view of a conventional combustion plate.
4 is a plan view of another embodiment; FIG. 5 is an enlarged sectional side view taken along the line - of FIG. 4;
FIG. 6 is a diagram for comparing and explaining the conventional combustion plate and the proposed combustion plate. 1... Plate body, 2... Flame hole, 3... Concave groove, 4...
Convex part.

Claims (1)

[Scope of utility model registration request] A large number of flame holes 2 penetrating the front and back of a plate 1 made of ceramic or other heat-resistant material as the main material are provided.
In those arranged so that the height of the triangle defined by the line segments connecting the centers of three adjacent flame holes 2 is a substantially regular triangle that is larger than the diameter of the flame hole 2, the plate body 1, similar to a regular triangle, with three flame holes 2 in the middle of each side and one flame hole 2 at each vertex position.
A large number of triangular concave grooves 3 are arranged side by side, and a substantially regular triangular convex portion 4 having three flame holes 2 inside is formed between each concave groove 3. Infrared burning board.