JPH0674815U - Premix burner - Google Patents

Abstract

(57) [Abstract] [Purpose] Providing a premixed burner with excellent durability by keeping the temperature of the nipping portion of the nipping member on the combustion surface side of the burner plate low to reduce the thermal stress applied to the nipping member. [Configuration] A ceramic plate 1 having a large number of gas ejection holes 2 and a pair of holding members 4 and 5 for holding the peripheral end portion of the plate, wherein a step portion 3 is provided at the peripheral end portion of the plate 1. And the stepped portion is formed by a pair of holding members 4, 5
It is characterized in that the heat insulating material 8 is attached to the peripheral end portion of the plate 1 so as to shield the plate holding portion 4C of the holding member 4 on the combustion surface side from the radiant heat of the combustion flame.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a premix burner using a heat resistant plate such as a ceramic plate.

[0002]

[Prior art]

 Generally, the holding structure of a premixed burner using ceramic, which is a non-metal material, is held by using a metal material with excellent workability. A conventional plate holding structure of this type of premix burner will be described with reference to FIG. Reference numeral 1'denotes a ceramic plate having a large number of gas ejection holes 2'and 2'for ejecting a premixed gas. Reference numerals 4'and 5'represent a pair of metal clamping members for clamping the peripheral end of the plate 1 '. With the member, the peripheral portion of the plate 2'is clamped by the clamping portion 4C 'of the clamping member 4'and the peripheral end portion 5C' of the clamping member 5'through the packing member 6 ', and both clamping members 4', 5 ' 'Is fixed to a substrate 7'which constitutes a part of a burner wind box by a screw (not shown). Reference numeral 8'denotes a heat insulating material fixed to the substrate 7'at the peripheral end of the plate 1'to prevent the sandwiching member 5'and the substrate 7'from overheating.

[0003]

[Problems to be solved by the device]

 According to this conventional example, the sandwiching portion 4C 'of the sandwiching member 4'on the combustion surface side is exposed to the flame and receives a large amount of radiant heat, so that the sandwiching portion 4C' at a high temperature and the opposite sandwiching portion side at a low temperature are exposed. There is a risk that the temperature difference from the end portion becomes large, and this causes thermal stress, cracks may occur, and flashback may occur. In order to solve this problem, a sandwiching member made of a material having excellent heat resistance may be used, but it is expensive and there is a problem that the cost of the burner increases. Another method to solve this problem is to insulate the parts that become hot, but depending on the insulation structure, the construction is uncertain and there is a problem that the life is short, and an expensive structure with high yield strength is required. Was becoming. The present invention has been made for the purpose of solving these problems and providing a low cost holding structure having high heat resistance.

[0004]

[Means for Solving the Problems]

 This invention comprises a plate made of a heat-resistant material having a large number of gas ejection holes, and a pair of holding members for holding the peripheral end portion of the plate, wherein a step portion is provided at the peripheral end portion of the plate. The stepped portion is sandwiched by the pair of sandwiching members, and at the same time, the heat insulating material is provided on the peripheral end portion of the plate so as to shield the plate sandwiching portion of the sandwiching member on the combustion surface side from the radiant heat of the combustion flame. It is characterized by being attached.

[0005]

[Action]

 According to this invention, the sandwiching portion 4C 'of the sandwiching member 4 on the combustion surface side becomes far from the flame, and is shielded from the flame by the heat insulating material 8', so that the temperature of the sandwiching portion 4C 'is kept low. The thermal stress applied to 4 is reduced.

[0006]

【Example】

 Hereinafter, a specific embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view of a main part of a premixing burner according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a ceramic plate having a large number of gas ejection holes 2 and 2 through which a premixed gas is ejected, and a step 3 for holding is formed at a peripheral end portion. The upper surface (combustion side surface) of the step portion 3 is formed as an inclined surface that is inclined downward toward the outside.

Numerals 4 and 5 are a pair of metal sandwiching members for sandwiching the peripheral end portion of the plate 3. The sandwiching member 4 on the combustion surface side is a base portion 4A and a standing upright from the base portion according to the thickness of the step portion 3. It comprises an upper part 4B and a sandwiching part 4C which inclines at an inclination angle corresponding to the inclination of the upper surface of the step part 3 from the rising part 4B. The rising portion 4B and the sandwiching portion 4C form a recess for receiving the plate 1 having a shape matching the outer shape of the plate 3. The other holding member 5 has an opening 5A in the center. Needless to say, the height of the rising portion 4B and the inclination angle of the sandwiching portion 4C are in cooperation with the sandwiching member 5 on the non-combustion surface side on the flat plate with the packing member 6 interposed, and the peripheral end step of the plate 1 is performed. It goes without saying that the part 3 is set so that it can be clamped. By tilting the stepped portion 3 and the sandwiching portion 4C, the plate 1 can be held in the left-right direction without rattling.

Both holding members 4 and 5 are fixed to a substrate 7 forming a part of a wind box of a burner by screws (not shown). Reference numeral 8 is a heat insulating material that shields the holding portion 4C of the holding member 4 from the radiant heat of the flame and is fixed to the substrate 7 at the peripheral end portion of the plate 1 to prevent the holding portion 4C and the substrate 7 from overheating. . The portion of the heat insulating material 8 that strikes the sandwiching portion 4C may or may not be cut out according to the inclination of the sandwiching portion 4C.

According to this embodiment, the sandwiching portion 4C of the sandwiching member 4 becomes far from the flame, that is, the combustion surface 1A of the plate 1, the amount of radiant heat received from the flame is reduced, and the sandwiching portion 4C is flamed by the heat insulating material 8. As shown in FIG. 4, the temperature of the holding portion 4C is kept low because it is shielded from. Further, since the base portion 4A of the sandwiching member 4 is in surface contact with the sandwiching member 5 that is in contact with the relatively low temperature premixed gas, it is kept at a low temperature as shown in the figure, and the sandwiching portion 4C and The temperature difference of the base portion 4A is kept low. As a result, the thermal stress applied to the sandwiching member 4 can be kept below a predetermined reference value. In FIG. 4, X is the distance from the base portion 4A to the sandwiching portion 4C, X1 is the distance to the sandwiching portion 4C of this embodiment, and X2 is the distance to the sandwiching portion 4C 'of the conventional example. .

The present invention is not limited to the above embodiment, and another embodiment will be described below with reference to FIGS. 2 and 3.

A second embodiment of the present invention will be described with reference to FIG. In FIG. 2, constituent elements corresponding to those in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted. 2 is different from FIG. 1 in that the step portion 3 of the plate 1 is formed by forming a concave groove 9 in the lateral direction. The stepped portion 3 is sandwiched by the substantially horizontal sandwiching portion 4C of the sandwiching member 4 and the other sandwiching member 5. In this embodiment, since the sandwiching portion 4C of the sandwiching member 4 is shielded from the flame by the heat insulating material 8 and the eaves portion 10 of the plate 1, the temperature of the sandwiching portion 4 can be kept lower than that in the embodiment of FIG. In this embodiment, the holding members 4 and 5 are, for example, divided into two or four.

A third embodiment of the present invention will be described with reference to FIG. In FIG. 3, constituent elements corresponding to those in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted. 3 is different from FIG. 1 in that the stepped portion 3 of the plate 1 is formed in a horizontal plane, the holding member 4 on the combustion surface side is formed in a flat plate shape, and the holding member 5 on the non-combustion surface side is formed. Is bent as shown in the drawing, and the stepped portion 3 is held between the holding portion 4C of the holding member 4 and the holding member 5 holding portion 5C.

The present invention is not limited to the above embodiment, and the burner plate 1 may be made of any heat-resistant material such as corrugated tape other than ceramics. The holding member 5 can also be the wind box substrate 7.

[0014]

[Effect of device]

 As described above, according to the present invention, it is possible to keep the temperature of the sandwiching portion of the sandwiching member on the combustion surface side of the plate low, and to reduce the thermal stress applied to the sandwiching member, thereby premixing with excellent durability. It is very effective in providing a burner.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view of an essential part of another embodiment of the present invention.

FIG. 3 is a cross-sectional view of an essential part of another embodiment of the present invention.

FIG. 4 is a temperature characteristic diagram of a sandwiching member on a combustion surface side according to an embodiment of the present invention and a conventional example.

FIG. 5 is a sectional view of a main part of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 plate 2 gas ejection hole 3 step portion 4, 5 sandwiching member 4C sandwiching portion 8 heat insulating material

Claims (1)

[Scope of utility model registration request] 1. A plate comprising a plate made of a heat-resistant material having a large number of gas ejection holes, and a pair of clamping members for clamping the peripheral end of the plate, wherein a step is formed at the peripheral end of the plate. Then, while sandwiching this stepped portion with the pair of sandwiching members, a heat insulating material is attached to the peripheral end portion of the plate so as to shield the plate sandwiching portion of the sandwiching member on the combustion surface side from the radiant heat of combustion flame. Premixed burner.