TWI616622B - Net format burner or furnace cover method and finished product - Google Patents

Abstract

The invention manufactures a finished product of a grid head or a furnace cover by the steps of initial embryo forming processing, limit processing, tapping processing, grid positioning, placing and arranging, and rolling edging processing, wherein A recessed open-shaped limiting area is formed in the top end of the burner head or the furnace cover, so that a predetermined shape mesh plate having a flame hole can be accommodated at the limiting area, and the furnace is rolled and pressurized. The side edge of the stop surface of the head primordial or the hood of the hood is bent and deformed toward the inner side to form a limiting portion, and the limiting portion can cover the top surface of the peripheral edge of the mesh plate so as to cover The top edge of the mesh plate is sandwiched between the restricting portion and the base surface, and the mesh plate is surely coupled to the integrated product of the burner or the furnace cover by the roll wrapping method.

Description

Net format burner or furnace cover method and finished product

The invention relates to a net format burner or a furnace cover; in particular to a net formed by clamping a peripheral edge of a grid plate by a rolling edging process to cover the initial embryo or the initial embryo of the furnace cover. Format burner or furnace cover and its finished products.

According to the applicant, the applicant has previously obtained the patent certificate number No. I 504845 "manufacturing gas stove cover method and its finished product", which includes: a furnace cover 2 having a ring-shaped ring top region 20 formed on the top surface thereof. And the inside of the ring top region 20 is formed by a molten metal liquid through a mold to form an integral coating sandwiching the circumference of the metal sheet 1 having a plurality of through holes 10 and being located in the circumference The outer bottom edge of the furnace cover 2 is formed with a socket portion 22 for directly fitting the ring opening 30 of the burner head 3.

Although the prior art can improve the various defects of the previous furnace cover, and its creation can achieve its creative purpose, and is deeply loved by consumers, when it is manufactured, it will have the following defects:

Since the diameter of the through hole at the outermost edge of the cut circular metal sheet is different, so that the cut metal sheet is placed in the mold, it is not 100% tight (ie, An irregular gap is formed between the peripheral edge of the mold and the metal sheet, and the molten metal liquid permeates from the irregular gap between the mold and the metal sheet. The flow is filled in a part of the through hole of the metal sheet, so that the partial through hole near the vicinity of the ring top area is filled with the blockage and the partial through hole is partially irregularly blocked, resulting in a large production failure rate. In addition, the flow area of the gas emitted through the through holes of the metal sheet is also reduced (because the partial through hole is filled or the portion of the through hole is blocked), and the combustion area is relatively small. This in turn causes a decrease in calorific value and thermal efficiency and an increase in exhaust gas (ie, carbon monoxide or carbon monoxide produced by incomplete combustion).

As mentioned above, due to the substantial increase in the production defect rate, the overall cost has also increased to become another major problem.

In view of this, the present inventors actively developed research, and in order to improve the above-mentioned conventional method for manufacturing a gas stove cover and the absence of the finished product, the inventors have long been engaged in the research and experiment with such products, and after a long period of hard work of research and experiment, finally The development and design of the net format burner or furnace cover method and the finished product thereof of the present invention can benefit all consumers and manufacturers.

The main content of the net format burner or furnace cover method and the finished product thereof of the invention is to provide an initial embryo forming process, a limit processing, a tapping process, a grid positioning, a placement fit, and a roll wrapping process. And a step of manufacturing a finished product of a grid head or a furnace cover, wherein a top surface of the burner head or the furnace cover is formed with a recessed open-shaped limiting area, and a bottom end surface of the bottom end is formed with a hollow opening a socket portion, and the limiting portion is a region surrounded by a horizontal base surface and a non-horizontal stop surface, so that a grid plate of a predetermined shape can be accommodated therein. At the base surface of the limiting area, a half-side side edge of the stop head of the burner head or the initial beam of the furnace head is bent and deformed toward the inner side by rolling and pressing to form a limiting portion, and the limiting portion can cover The top surface of the peripheral edge of the mesh plate is near, so that the top edge of the mesh plate is clamped The cover is wrapped between the limiting portion and the base surface, and the mesh plate is surely coupled to the burner or the furnace cover to form a unitary product by rolling and wrapping; thus, not only can the various advantages of the prior art be maintained. At the same time, it can overcome the problem that the prior art can no longer improve the heat value and thermal efficiency and the exhaust gas cannot be reduced. In addition, the present invention can greatly improve the production yield, thereby greatly reducing the cost thereof, thereby greatly improving the Market competitiveness and market share are its progressive claims.

1‧‧‧ burner

10‧‧‧ burner initial embryo

101‧‧‧Mixed tube

102‧‧‧Mixed tube

103‧‧‧Mixed room

104‧‧‧Mixed room

11‧‧‧Limited area

110‧‧‧Base surface

111‧‧‧stop surface

112‧‧‧Limited

12‧‧‧Limited Zone

120‧‧‧Base surface

121‧‧‧stop surface

122‧‧‧Limited

13‧‧‧ Ribs

131‧‧‧Threaded hole

2‧‧‧Cover

20‧‧‧Heath cap embryo

21‧‧‧Limited area

210‧‧‧Base surface

211‧‧‧stop surface

212‧‧‧Limited

22‧‧‧ Sockets

23‧‧‧ Ribs

231‧‧‧Threaded hole

25‧‧‧ inner lid

251‧‧‧Limited area

2510‧‧‧Base surface

2511‧‧‧stop surface

2512‧‧‧Limited

252‧‧‧ Sockets

26‧‧‧Outer furnace cover

261‧‧‧Limited area

2610‧‧‧Base surface

2611‧‧‧stop surface

2612‧‧‧Limited

262‧‧‧ Sockets

3‧‧‧ grid board

30‧‧‧flame hole

31‧‧‧Positioning holes

4‧‧‧ bolt

Figure 1 is a schematic flow diagram of the present invention.

Figure 2 is a perspective exploded view of the present invention.

Figure 3 is a partial enlarged view of the combined cross section of the present invention without rolling.

Fig. 4 is a cross-sectional view showing another combination of Fig. 3.

Fig. 5 is a partially enlarged view of the combined section when the third drawing is subjected to rolling processing.

Fig. 6 is another combined sectional view of Fig. 5.

Fig. 7 is a combined plan view when the figure 6 is used.

Figure 8 is a schematic view of another flow of the present invention.

Figure 9 is a schematic cross-sectional view showing a combined use state of the present invention.

Figure 10 is a schematic cross-sectional view showing a combination of another state of use of the present invention.

The invention relates to a net format burner or furnace cover method and a finished product thereof, as shown in Figures 1 to 7, the method comprises at least: (A) initial embryo forming processing: material (such as copper) Material, copper alloy material, etc.) forming a predetermined shape of the burner head embryo 10 or the furnace head embryo through forging processing or casting processing 20; wherein the burner initial 10 includes at least one mixing tube 101, 102 for injecting gas from a nozzle (not shown), and a ring shape capable of communicating with the (inner and outer) mixing tubes 101, 102 ( Inner and outer rings) mixing chambers 103, 104, in particular, the top end faces of the mixing chambers 104 respectively form an inwardly recessed open-ended limiting area 11; in addition, the furnace cover initials 20 comprise at least one top end facing inward Forming a recessed open-shaped limiting area 21, and a bottom end surface thereof is formed inwardly with a recessed open-shaped socket portion 22 (eg, Figures 3 and 4); (B) Limit processing: the beginning of the furnace head The embryo 10 or the hood initial embryo 20 is placed at a working machine (not shown) or a machine table (not shown), and is turned or milled into the open end face of the burner head 10 (ie, the limit zone 11) Or the open end face of the furnace head preform 20 (ie, the limiting area 21) is cut to form a horizontal flat base surface 110, 210 and a non-horizontal flat stop surface 111, 211, and the base surface 110, 210 to A proper angle is formed between the stop faces 111, 211 (ie, the angle is preferably between 60 degrees and 120 degrees), so that the base faces 110, 210 to the stop faces 111, 211 The area sandwiched between the two will be formed into a limiting area 11, 21 for the grid plate 3 (eg, Figures 3 and 4); (C) Tapping processing: will be located in the initial head of the burner 10 The ribs 13 (i.e., the ribs 23 (i.e., not shown) that are suspended above the mixing chamber 104 and do not completely block the gas flow that blocks the mixing chamber 104) or the ribs 23 of the furnace primaries 20 (i.e., from the furnace cover) The internally threaded holes 131, 231 are processed at the through holes (not shown) of the horizontally flat base surface 210 of the initial embryo 20 to the position of the top edge of the socket portion 22 toward the center thereof. (eg, figures 1, 3, and 4) for screwing and fastening the bolts 4; (D) placing the sleeves: placing the predetermined shape grid plate 3 having the flame holes 30 in a sleeve In the limit zone 11, 21 of the burner head embryo 10 or the furnace head embryo 20, and The positioning hole 31 already located in the grid plate 3 can be aligned with the internally threaded hole 131 of the rib 13 of the burner head 10 or the internally threaded hole 231 of the rib 23 of the furnace head preform 20, and the limiting area 11, 21 The height of the stop faces 111, 211 is higher than the thickness of the grid plate 3 (eg, Figures 3 and 4); and the mesh plate 3 is preferably made of a material such as copper alloy, white iron, copper or copper alloy, and The expansion coefficient, melting point and ductility of the grid plate 3 are not superior to the expansion coefficient, melting point and ductility of the burner head 10 or the furnace head embryo 20; in addition, the surface of the grid plate 3 is distributed The plurality of flame holes 30 regularly or irregularly arranged, and the grid plate 3 at the inner threaded holes 131, 231 of the ribs 13, 23 are provided with positioning holes 31 (that is, the positioning holes 31 are at least one or more, equidistant (E) Grid positioning: one end of the bolt 4 is passed through the positioning hole 31 of the grid plate 3 and screwed to the internal threads 131, 231 of the ribs 13, 23, respectively, forcing the grid The plates 3 are respectively placed between the bolts 4 and the ribs 13 and 23, or the grid plate 3 is fixed to the limit of the burner head 10 or the furnace head embryo 20 by adhesive bonding. 11, 21 (such as: Figures 3 and 4), so that the bottom surface of the grid plate 3 can be surely attached to the horizontal base surface 110, 210, and the ribs 13, 23 are located below the grid plate 3, so that The flame hole 30 of the grid plate 3 which has been located above the ribs 13, 23 does not generate a flame, so that the outside air can flow into the gas supply from the inside; (F) Rolling edge processing: using rolling The upper half side edge of the stop surface 111 of the burner head 10 or the stop surface 211 of the furnace head blank 20 is bent and deformed toward the inner side thereof to form an annular cover-like restricting portion 112, 212, and The limiting portions 112, 212 can cover the top surface of the peripheral edge of the grid plate 3 so as to cover the top edge of the grid plate 3 so as to be sandwiched between the base surface 110 of the burner head 10 or Between the base surface 210 of the hood initial embryo 20 and the limiting portions 112, 212 (for example, Figures 5, 6, and 7); (D) Finished product: the top edge of the surrounding mesh plate 3 is completely sandwiched and covered Finished on the burner head 10 or the furnace head preform 20, and integrated into a product of the net shape burner head 1 or the furnace cover 2; however, the finished product of the grid format burner 1 produced by the above method includes A limiting portion 11 having a recessed opening shape is formed in a front end surface of the burner head 1, and a rib 13 is disposed in a hanging manner from an inner side edge of the mixing chamber 104 of the burner head 1 toward the center direction, wherein the limiting portion 11 is The grid plate 3 that has been cut into a predetermined shape can be accommodated at the limit area 11 by a region surrounded by a horizontally flat base surface 110 and a non-horizontal stop surface 111. And the grid plate 3 is spanned above the ribs 13, and the grid plate 3 is fixed to the limit of the burner 1 by means of bolts 4 screwed into the internally threaded holes 131 of the ribs 13 or by adhesion of the adhesive. At the area 11, the bottom surface of the grid plate 3 can be surely attached to the horizontal base surface 110, and the stop surface of the burner head 10 is firstly rolled and pressurized. 11 The upper half side edge is bent and deformed toward the inner side thereof to form an annular wrap-like restricting portion 112, and the restricting portion 112 is annularly covered with a flame hole 30 covering the top surface of the peripheral edge of the mesh plate 3 So that the flame hole 30 near the periphery of the mesh plate 3 is restrained by the gap between the stopper portion 112 and the base surface 110, so that the grid plate 3 and the burner head 1 are integrated into one body, plus The bottom surface of the mesh plate 3 is in close contact with the surface of the rib 13 so that the flame hole 30 of the mesh plate 3 which is located above the rib 13 does not have gas gas ejected therefrom, and no flame is generated therefrom. Therefore, the outside air can flow into the gas supply and re-burn from here, thereby increasing the combustion heat value, increasing the heat efficiency and reducing the generation of exhaust gas; In addition, the finished product of the mesh cover 2 made by the above method comprises a limiting portion 21 having a concave open shape facing the top end of the furnace cover 2, and a hollow opening formed inwardly at the bottom end surface of the furnace cover 2 a rib 23 of a shape, and a rib 23 disposed in a hanging manner from a bottom edge of the limiting portion 21 of the furnace cover 2 to an inner edge between the top edges of the socket portion 22, wherein the limiting portion 21 is Between the horizontally flat base surface 210 and a non-horizontal stop surface 211, the grid plate 3 that has been cut into a predetermined shape can be accommodated at the limit area 21 And the grid plate 3 is located above the rib 23, and the grid plate 3 is fixed to the limit of the furnace cover 2 by bolts 4 screwed to the internal threaded holes 231 of the ribs 23 or by adhesion of the adhesive. At the area 21, the bottom surface of the mesh plate 3 can be surely attached to the horizontal base surface 210, and the upper half side edge of the stop surface 211 of the furnace cover ejector 20 is bent toward the inner side by rolling and pressing. Extending deformation to form an annular wrap-like limiting portion 212, and the limiting portion 212 is covered with the annular covering on the grid The flame hole 30 near the top surface of the edge of the 3rd edge is such that the flame hole 30 at the near periphery of the mesh plate 3 is restrained by the gap between the stopper portion 212 and the base surface 210, so that the grid plate 3 In combination with the furnace cover 2, the bottom surface of the mesh plate 3 is in close contact with the surface of the rib 23, so that the flame hole 30 of the mesh plate 3 which is located above the rib 23 does not have gas for gas. Spraying from here, it will not generate a flame here, so that the outside air can flow into the gas supply and re-burn from here, thereby increasing the combustion heat value, increasing the thermal efficiency and reducing the generation of exhaust gas; The annularly arranged flame holes 30 near the periphery of the mesh plate 3 are sandwiched between the restricted portions 112, 212 and the base faces 110, 210, so that the gas in the mixing chambers 103, 104 can only be A flame hole 30 distributed at a position near the intermediate portion of the mesh plate 3 (ie, an area formed by excluding the circumferential side edge of the covered mesh plate 3) It is sprayed for the combustion of the uniform mixing of the secondary air. At this time, the burning flame is not directly located at the coated grid plate 3 for flame combustion so as to be coated on the circumferential side edge of the grid plate 3 The temperature of the limiting portions 112, 212 is lower than the temperature of the grid plate 3, and the expansion coefficient of the burner 1 or the furnace cover 2 is greater than the expansion coefficient of the grid plate 3, and the burner 1 or furnace The temperature at which the cover 2 can withstand is higher than the melting point temperature that the grid plate 3 can withstand, so that the grid plate 3 is not detached from the burner head 1 or the furnace cover 2 due to expansion, but instead the grid The combination of the plate 3 and the burner head 1 or the furnace cover 2 is further tightened, so that not only can the various advantages of the prior art be preserved, but also the production yield of the prior art can be greatly improved, and the The cost is reduced in magnitude, which in turn greatly increases its competitiveness and market share.

Please refer to FIG. 8 , which is a flow chart of another embodiment of the present invention. The main change is: the process of “limit processing” and “tapping processing” after the original “original forming process”. , changed to: "Emotic embryo molding processing", first "Tapping processing" and then "limit processing", with the initial embryo forming processing, tapping processing, limit processing, grid positioning, placement sleeve Finishing, rolling edge processing and the like to produce a finished product of the grid head 1 or the furnace cover 2; as for the above-mentioned initial embryo forming processing, tapping processing, limit processing, grid positioning, placement and fitting, The steps of rolling and edging processing have been described in detail above, and therefore will not be described here.

Please refer to FIG. 9 , which is still another use state diagram of the present invention. The main change is that the burner head 10 includes at least one mixing tube 101 for injecting gas from a nozzle (not shown). 102, and ring-shaped (inner and outer ring) mixing chambers 103, 104 capable of communicating with the (inner and outer) mixing tubes 101, 102, in particular, the top surfaces of the mixing chambers 104, 103 are respectively formed to be open toward the inner recess a limiting area 11, 12 (such as: Figure 9), and the limiting area 11, 12 includes at least one horizontal flat surface 1 10, 120 and a non-horizontal flat stop surface 111, 121, and a suitable angle between the base surface 110, 120 and the stop surface 111, 121 (ie, the angle between 60 degrees and 120 degrees) Preferably, the area sandwiched between the base faces 110, 120 and the stop faces 111, 121 is formed as a stop zone 11, 21 for the grid plate 3 to be received, so that the cut has been made The grid plate 3 of the predetermined shape is placed in the limiting regions 11, 12 of the burner head 10, and the heights of the blocking surfaces 111, 121 of the limiting regions 11, 12 are higher than the grid plate 3. At this time, the grid plates 3 are respectively fixed to the limit areas 11 and 12 of the burner head 10 by means of bolts 4 or adhesives, and then the head of the furnace head 10 is stopped by rolling and pressing. The upper half side edges of the faces 111, 121 are bent and deformed toward the inner side thereof to form annular seal-like restricting portions 112, 122, and the restricting portions 112, 2122 can cover the top of the peripheral edge of the mesh plate 3 The surface is close to the top edge of the grid plate 3 so as to be sandwiched between the base faces 110, 120 of the burner head 10 to the limiting portions 112, 122; Type processing, tapping processing, limiting processing, locator, nested placement, edging rolling processing step, was described in detail above, it is not repeat them here.

Please refer to FIG. 10, which is another use state diagram of the present invention. The main change is that the original single furnace cover 2 is changed to be replaced by the inner furnace cover 25 and the outer furnace cover 26, wherein the inner and outer portions are replaced. The furnace cover 25, 26 includes at least a limiting portion 251, 261 having a recessed open shape facing inwardly, and a recessed open sleeve portion 252, 262 formed inwardly at the bottom end surface, and the self-limiting region 251 , the base surface 2510, 2610 of the 261 to the position between the top edges of the socket portions 252, 262 is a partially extending suspended rib (not shown) toward the center thereof, wherein the limiting portion 251, 261 includes at least one Level The flat base surface 2510, 2610 and a non-horizontal flat stop surface 2511, 2611, and a suitable angle between the base surface 2510, 2610 and the stop surfaces 2511, 2611 (ie, the angle is between 60 degrees Preferably, the area between the base surfaces 2510, 2610 and the blocking surfaces 2511, 2611 is formed as a limiting area 251, 261 for the grid plate 3 to be accommodated. The grid plates 3 of the predetermined shape after cutting are placed in the limiting regions 251, 261 of the inner and outer furnace covers 25, 26, respectively, and the blocking surfaces 2511, 2611 of the limiting regions 251, 261 are made. The height is higher than the thickness of the grid plate 3; at this time, the bolts 4 are used (i.e., screwed into the internal thread holes (not shown) of the ribs (not shown) of the inner and outer furnace covers 25, 26 or adhered The mesh plate 3 is fixed to the limiting regions 251 and 261 of the inner and outer furnace covers 25 and 26, respectively, and the upper half of the blocking surfaces 2511 and 2611 of the inner and outer furnace covers 25 and 26 are further rolled and pressurized. The side edge of the segment is curved and deformed toward the inner side thereof to form an annular covering-shaped restricting portion 2512, 2612, and the limiting portion 2512, 2612 can cover the peripheral edge of the mesh plate 3 The surface is so close that the peripheral edge of the mesh plate 3 is respectively sandwiched between the base faces 2510, 2610 of the inner and outer furnace covers 25, 26 to the limit portions 2512, 2612; The steps of tapping, limit processing, grid positioning, placement and assembly, and rolling edge processing have been described in detail above, so they are not described here.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; therefore, the features and spirits described in the scope of the present application are equally varied or modified. Within the scope of the patent application of the present invention.

Claims (11)

The invention relates to a net format burner or furnace cover method, which comprises: (A) priming forming process: forming a predetermined shape of a burner initial or a hood primordial by a forging process or a casting process; (B) Putting the sleeve: placing the predetermined shape grid plate with the flame hole into the limit zone of the initial embryo or the initial cover of the furnace cover; (C) rolling edge processing: using rolling pressure The method comprises forming a limiting portion by bending and deforming a side edge of the upper half of the burner initial or the initial embryo of the furnace cover toward the inner side thereof, and the limiting portion can cover the top surface near the peripheral edge of the mesh plate, so as to cause The peripheral edge of the above-mentioned grid plate is indeed sandwiched and covered on the initial embryo of the burner or the initial embryo of the furnace cover; (D) Finished product: the peripheral edge of the above-mentioned mesh plate is indeed sandwiched and covered at the beginning of the furnace head or the furnace cover The embryo, that is, the finished product of the burner or the furnace cover. The method for manufacturing a gas stove cover according to claim 1, wherein the step (A) of the initial embryo forming process to the step (B) of placing the nesting is performed by a limited processing, and the limiting processing is mainly The burner head or the hood primordial is placed at the working machine, and the open end of the burner head or the primordial head is formed with a horizontal basal plane and a non-horizontal shape by turning or milling. The stop surface is sandwiched between the base surface and the stop surface to form a limited area. The method for manufacturing a gas stove cover according to the first aspect of the invention, wherein, before the step (B) is placed, the tapping processing step is further performed, and the tapping processing step mainly processes the through hole of the rib into Internal threaded hole for screw bolt fastening. The method for manufacturing a gas stove cover according to claim 1, wherein (B) after the sleeve is placed, a tapping processing step is further performed, and the tapping processing step is mainly for ribbing. The through hole is machined into an internally threaded hole for screw fastening and fastening. The method for manufacturing a gas stove cover according to claim 1, 2, 3 or 4, wherein the step (B) is placed in the step (C), and the rolling edge processing is performed between the other In the positioning step, the grid positioning step is to fix the grid plate to the limit area of the initial embryo of the burner or the initial embryo of the furnace cover by bolting or adhesive bonding. A finished product of a net form furnace cover method, comprising: a furnace cover, wherein a top end surface of the bottom surface is formed with a recessed open-shaped limiting area, and a bottom end surface thereof is formed inwardly with a recessed open-shaped socket portion, wherein The limiting zone is defined by a horizontal basal plane and a non-horizontal damming surface; the grid plate has a plurality of penetrating flame holes distributed on the surface thereof, and the grid The plate system is disposed at the limiting portion; the limiting portion is formed by bending and pressing the side edge of the blocking surface of the initial cover of the furnace cover toward the inner side thereof, and the limiting portion can cover and cover The top surface of the peripheral edge of the mesh plate is near, so that the top edge of the mesh plate is sandwiched between the limiting portion and the base surface, and the mesh plate is surely combined by the roll wrapping method. Formed on the furnace cover to form a unitary body. The finished product of the net form lid method according to claim 6, wherein the furnace cover is provided with suspended ribs, and the rib is located below the grid plate so that the grid is located above the rib The flame hole of the plate does not generate a flame, and the outside air can flow from here to supply and recombine. The finished product of the mesh cover method according to claim 6 or 7, wherein the mesh plate is formed with at least one positioning hole, and is opposite to the rib of the furnace cover below the positioning hole. An internally threaded hole is formed for the end of the bolt to pass through the positioning hole of the grid plate Fitted into the internally threaded hole so that the grid plate can be clamped between the bolts and the ribs of the furnace cover. A finished product of a grid format burner process, comprising: a burner comprising at least a mixing tube for injecting gas from a nozzle, and a mixing chamber capable of communicating with the mixing tube, wherein a top surface of the mixing chamber is formed An open-shaped limiting area is recessed, and the limiting area is surrounded by a horizontal base surface and a non-horizontal stop surface; the grid plate has a surface distributed thereon a plurality of penetrating flame holes, wherein the grid plate is received at the limiting region; and the side edge of the blocking surface of the burner head is bent and deformed toward the inner side by rolling and pressing Forming a limiting portion, and the limiting portion can cover a top surface of the peripheral edge of the mesh plate so as to cover the top edge of the mesh plate between the limiting portion and the base surface, thereby enabling The grid plate and the burner are combined into one body due to the rolling edging method. The finished product of the net form lid method of claim 9, wherein the burner head is provided with a suspended rib, and the rib is located below the grid plate so that the grid is located above the rib The flame hole of the plate does not generate a flame, and the outside air can flow from here to supply and recombine. The finished product of the mesh cover method according to claim 9 or 10, wherein the mesh plate is formed with at least one positioning hole and is opposite to the rib of the burner below the positioning hole. An internally threaded hole is formed for one end of the bolt to pass through the positioning hole of the grid plate and screwed to the internally threaded hole, so that the grid plate can be sandwiched between the bolt and the rib of the burner.