METHOD FOR MANUFACTURING A GAS BURNER

• US 20130306056A1
• Filed: 05/17/2012
• Published: 11/21/2013
• Est. Priority Date: 05/17/2012
• Status: Active Grant

• Current Assignee: Sabaf SpA
• Original Assignee: Sabaf SpA
• Inventors: Dora, Massimo
• Granted Patent: US 10,145,563 B2
• Time in Patent Office: Days
• US Class Current: 126/39.E
• CPC Class Codes: B22C 9/00 Moulds or cores uniquely adapted to particular casting processes B22D; Moulding processes
• CPC Class Codes: B22C 9/10 Cores; Manufacture or installation of cores breaker cores B22C9/084
• CPC Class Codes: B22C 9/101 Permanent cores
• CPC Class Codes: B22D 17/22 Dies manufacture, see the appropriate class, e.g. B23P15/24; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
• CPC Class Codes: B22D 17/24 Accessories for locating and holding cores or inserts
• CPC Class Codes: B22D 25/02 by its peculiarity of shape; of works of art cylinders, pistons B22D15/02
• CPC Class Codes: F23D 14/065 with injector axis inclined to the burner head axis
• CPC Class Codes: F23D 2213/00 Burner manufacture specifications
• CPC Class Codes: F24C 3/085 on ranges

Abstract

Method for manufacturing a gas burner of the type comprising a cup, provided with at least one tubular tapered part of a mixer with axial Venturi effect, and shaped to couple with a burner head provided with at least one flame-spreader, wherein said cup is made in a single piece by casting or die-casting in an apposite mould. Such a method comprises, in sequence, the following steps:

• • a) arranging a mould with at least two shells, for casting or die-casting the afore said cup;
  • b) arranging at least one core which could be removably inserted into the respective mould, which has at feast one jutting portion shaped with at least one tubular tapered part of the stickle of the afore said mixer with axial Venturi effect;
  • c) inserting such a core into the mould and closing the afore said at least two mould shells so that the afore said at least one jutting portion of the core is retained, at least partially, at a distance from the opposite inner walls of the closed mould; the core and the mould being shaped so that at least one ending part of such a core replaces, at least partially, part of the perimetrical area of the cup defined by the mould;
  • d) pouring or pressure-injecting molten metal material into the closed mould;
  • e) opening the mould, drawing out the afore said core and then removing the die formed cup after the metal material is solidified;
  • f) applying at least one closing plug to the side hole (or side holes) of the die formed cup which corresponds/correspond to the ending part of the core which replaced part of the perimetrical area of the cup in the mould.

Claims

1. Method for manufacturing a gas burner of the type comprising a cup, provided with at least one tubular tapered part of a mixer with axial Venturi effect, and shaped to couple with a burner head provided with at least one flame-spreader, wherein said cup is made in a single piece by casting or die-casting in an apposite mould, characterized by comprising in sequence the following steps:

a) arranging a mould with at least two shells, for the casting or die-casting of said cup;

b) arranging at least one core which could be removably inserted into said mould, said core having at least one jutting portion shaped with at least one tubular tapered part of the strickle of said mixer with axial Venturi effect;

c) inserting said at least one core into the mould and closing said at least two mould shells, at least one ending part of said at least one core replacing, at least partially, part of the perimetrical area of the cup defined by said mould, said at least one jutting portion of said at least one core being retained as well, at least partially, at a distance from the opposite inner walls of the closed mould;

d) pouring or pressure-injecting molten metal material into said closed mould;

e) opening the mould, drawing out said core and then removing said die formed cup, after the metal material is solidified;

f) applying at least one closing plug to at least one side hole of the die formed cup corresponding to the ending part of said at least one core which replaces part of the perimetrical area of the cup in the mould.

2. Method according to claim 1, wherein said at least one jutting portion of said core comprises as well at least part of the strickle of one or more distributing ducts of the fuel mixture.

3. Method according to claim 1, wherein said at least one core comprises a supporting portion connected to said at least one jutting portion at the portion with greatest section of said at least one tubular tapered part of the strickle of said mixer with axial Venturi effect.

4. Method according to claim 2 wherein said at least part of the strickle of one or more distributing ducts of the fuel mixture is connected to said supporting portion of said core.

5. Method according to claim 4, wherein said at least one jutting portion comprises at least one tubular tapered part of the strickle of said mixer with axial Venturi effect and at least part of the strickle of at least two distributing ducts of the fuel mixture, said at least one tubular tapered part of the strickle of said mixer being interposed between the strickle parts of said at least two distributing ducts.

6. Method according to claim 1, wherein said step of f) applying at least one closing plug is preceded by a step of g) chip removal machining from walls inside the tubular region defined by said at least one core in said cup.

7. Method according to claim 1, wherein, said step f) comprises applying two or more closing plugs for at least two or more side holes of the die formed cup corresponding to parts of said at least one jutting portion of said core which replace part of the perimetrical area of the cup in the mould.

8. Method according to claim 1, wherein said mould comprises at least one support for a free end of said jutting portion of said core.

9. Method according to claim 1 by comprising, before said step of d) pouring or pressure-injecting molten metal material, the steps of:

h) arranging a second core which could be removably inserted into said mould, said second core having at least one jutting portion defining at least part of a duct;

i) inserting said second core into the mould and closing said at least two shells of the mould;

and wherein said step e) comprises as well the step of drawing out said second core too before removing the die formed cup, after the metal material is solidified.

10. Method according to claim 1, wherein said mixer with axial Venturi effect comprises a tubular tapered portion with a section increasing from a region with a narrow section, characterized in that said at least one jutting portion of said at least one core is provided with at least the whole strickle of said tubular tapered portion with increasing section of said mixer with axial Venturi effect.

11. Method according to claim 1, wherein said at least one tubular tapered portion of a mixer with axial Venturi effect develops along a substantially horizontal axis or along an axis forming an angle of less than 45°

with respect to the horizontal line.

12. Gas burner obtained by a method according to claim 1, of the type comprising a burner cup, provided with at least one tubular tapered part of a mixer with axial Venturi effect, and shaped to couple with a burner head provided with at least one flame-spreader, wherein said cup is made in a single piece by casting or die-casting, wherein at least part of the portion with increasing section of said mixer with axial Venturi effect is obtained as a whole, by casting or die-casting, with said cup.

13. Gas burner according to claim 12, wherein said burner head comprises at least one annular delivering chamber and at least one respective flame-spreader, the latter being disposed at least on a side portion of said annular chamber, said annular chamber being fed by at least said mixer with axial Venturi effect, by distributing ducts of the fuel mixture at least in part obtained in said burner cup.

14. Gas burner according to claim 12 said cup has at least one side surface hole, closed by an appropriate plug, said hole being placed at one end of said mixer with axial Venturi effect.