JPH08303722A - Fixing method of burner plate for premixing type gas burner - Google Patents

Abstract

PURPOSE: To fix a burner plate simply without deteriorating a fixing strength even when the burner plate is used for a long period of time. CONSTITUTION: In a premixing type gas burner, introducing a premixed gas into the wind box 4 of a burner and effecting combustion in the downstream of a burner plate 7, provided at the tip of the wind box 4, a space between the burner plate 7 and a burner main body is filled with a mat 6, inflated when it is heated once.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of fixing a burner plate provided at the tip of a premixing type gas burner.

[0002]

2. Description of the Related Art There is a premixing gas burner in which a burner plate made of ceramic or the like is provided at the tip of a burner and combustion is performed on the front side of the burner plate. In order to fix the burner plate to the burner, for example, there is a method in which a metal mounting piece is provided on the burner body and the burner plate is sandwiched to fix the burner plate. In this case, JP-A-4-33591
As described in No. 0, the flame heats the metal attachment piece, resulting in a problem that the strength is reduced.
In Japanese Patent Laid-Open No. 4-335910, the outer peripheral portion of the burner plate is wrapped with a sealing material and compressed to form a mixed gas impermeable portion on the outer peripheral portion of the burner plate, thereby preventing heating of the metal mounting piece. However, since the heating of the mounting piece cannot be completely eliminated, the strength eventually decreases.

[0003]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to provide a fixing method which can fix the burner plate easily without lowering the fixing strength even after long-term use. It is in.

[0004]

[Means for solving the problems] In a premixed gas burner in which a premixed gas is introduced into a wind box of a burner and burned downstream of a burner plate provided at the tip of the wind box, a premixed gas burner is provided between a burner plate and a burner body. Pack a mat that expands when heated once.

[0005]

[Function] If the mat that expands when heated is packed between the burner body and the burner plate, the mat expands when the burner burns for the first time, and the mat expands between the burner plate and the burner plate toward the burner plate side. And pressure is applied to the burner body side, and the burner plate is fixed.
The fixing strength is not lowered by burning because the fixing is not performed by the mounting piece whose strength is reduced by heat.

[0006]

An embodiment of the present invention will be described with reference to the drawings.
A mixing chamber 3 for mixing the combustion air sent from the blower 1 and the fuel gas sent from the main gas supply pipe 2 is provided on the front side of the premixing burner, and the mixing chamber 3 is connected to the wind box 4 of the burner. Has been done. A baffle plate 5 for stirring the premixed gas sent from the mixing chamber 3 into the wind box 4 near the connection portion with the mixing chamber 3 in the wind box 4, and a large number of holes at the tip of the burner. Each of the opened ceramic burner plates 7 is provided.

In the wind box 4, a pilot gas nozzle 9 for forming a pilot flame, a spark rod 11 for generating a spark downstream of the burner plate 7,
A frame rod 12 is provided downstream of the burner plate 7 to detect a flame.

Between the burner plate 7 at the tip of the burner and the wall surface 8 of the wind box, a mat 6 which expands when heated is packed so as to wind the burner plate 7. As the mat 6, Intarum Mat (trademark) manufactured by 3M USA can be used. This mat is a composite material consisting of heat expansion material (vermiculite, vermiculite) and ceramic fiber (alumina silica silica inorganic fiber),
It is used as a cushioning material or a heat insulating material by utilizing the fact that once it is heated, it expands three to four times in the thickness direction.

The combustion control of the burner is performed by the blower 1, the main solenoid valve 15 provided in the main gas supply pipe 2, and the pilot solenoid valve 1 provided in the pilot gas supply pipe 10 for supplying the fuel gas to the pilot gas nozzle 9.
3, the control device 14 connected to the spark rod 11 and the frame rod 12, respectively, performs combustion, and the control device 14 operates the blower 1 to open the pilot solenoid valve 13 and sparks from the spark rod 11. By generating it, a pilot flame is formed at the tip of the burner plate 7, and then the main solenoid valve 15 is opened to form a main flame.

When combustion is performed on the front side of the burner plate 7,
The heat is also transmitted to the mat 6 portion near the flame, and the mat 6 is heated and tries to expand in the thickness direction. If the thickness between the burner plate 7 and the wind box wall surface 8 is made narrower than the thickness when the mat 6 is expanded, the mat 6 expands from the mat 6 toward the burner plate 7 toward the wind box wall surface 8. A force pressing in the direction is generated, and the burner plate 7 is fixed.

[0011]

By implementing the present invention, the burner plate 7 can be fixed very easily, and the fixing strength does not decrease even after long-term use.

[Brief description of drawings]

FIG. 1 is a partial sectional view of an embodiment of the present invention.

FIG. 2 is a perspective view showing an outline of one embodiment.

[Explanation of symbols]

 1 Blower 2 Main gas supply pipe 3 Mixing chamber 4 Windbox 5 Baffle plate 6 Mat 7 Burner plate 8 Windbox wall surface 9 Pilot gas nozzle 10 Pilot gas supply pipe 11 Spark rod 12 Frame rod 13 Pilot solenoid valve 14 Control device 15 Main solenoid valve

Claims (1)

[Claims] 1. A premixed gas burner in which a premixed gas is introduced into a wind box of a burner and burned downstream of a burner plate provided at the tip of the wind box, the expansion occurs when the burner plate and the burner body are heated once. A method for fixing a burner plate of a premixed gas burner, which is characterized by being filled with a mat.