Combustion device having double-layer structure

Abstract

A combustion device having a double-layer structure includes a main body, which is double layered, including an inner-layer wall and an outer-layer wall disposed outside of and spaced from the inner-layer wall such that the inner-layer wall and the outer-layer wall include a hollow disposed therebetween. The inner-layer wall forms a fuel receptacle with an opening. A wick has an end defining fuel-drawing end inserted into the fuel receptacle through the opening.

Claims

1. A combustion device having a double-layer structure comprising: a main body, which is double layered, including an inner-layer wall and an outer-layer wall disposed outside of and spaced from the inner-layer wall such that the inner-layer wall and the outer-layer wall include a hollow disposed therebetween, and wherein the inner-layer wall forms a fuel receptacle with an opening; and a wick having an end defining fuel-drawing end inserted into the fuel receptacle through the opening; a retaining device including a sleeve securely holding the wick; wherein an air gap between the inner-layer wall and the outer-layer wall effectively insulates fuel in the fuel receptacle from being vaporized by heat; wherein the main body has an interconnecting portion interconnecting the inner-layer wall and the outer-layer wall, wherein the sleeve is fit in the interconnecting portion, and wherein the sleeve has a flange not abutting against a periphery of the interconnecting portion and rested on the outer-layer wall.

2. The combustion device as claimed in claim 1, wherein the main body is one-piece.

3. The combustion device as claimed in claim 1, wherein the interconnecting portion extends from an outer periphery of the inner-layer wall to an inner periphery of the outer-layer wall, wherein the interconnecting portion is hollow and the wick is inserted through the interconnecting portion, and wherein the wick has an end defining a burning end disposed outside of the interconnecting portion and the outer-layer wall.

4. The combustion device as claimed in claim 3, wherein the retaining device securely holds the wick in an upright position fit in place in the opening.

5. The combustion device as claimed in claim 4, wherein the sleeve has an outer periphery with at least one groove extending thereon and at least one gasket is mounted in the at least one groove, and wherein the at least one gasket abuts a periphery of the interconnecting portion.

6. The combustion device as claimed in claim 5, wherein the inner-layer wall and the outer-layer wall are made from a transparent material.

7. The combustion device as claimed in claim 5, wherein the wick is metallic.

8. The combustion device as claimed in claim 1, wherein the retaining device securely holds the wick in an upright position fit in place in the opening.

9. The combustion device as claimed in claim 1, wherein the inner-layer wall is in a form of a cylinder, wherein the outer-layer wall is in a form of a cylinder which has a radius greater than a radius of the inner-layer wall, and wherein the outer-layer wall has a center disposed coaxially with a center of the inner-layer wall.

10. The combustion device as claimed in claim 9, wherein the outer-layer wall has a portion defining a connecting portion which extends radially outwardly from the interconnecting portion to a circumference of the outer-layer wall.

11. The combustion device as claimed in claim 1, wherein the inner-layer wall is in a form of a sphere, wherein the outer-layer wall is in a form of a sphere which has a radius greater than a radius of the inner-layer wall, and wherein the inner-layer wall and the outer-layer wall are disposed eccentrically.

12. The combustion device as claimed in claim 1, wherein the outer-layer wall is disposed on a pedestal, and wherein the pedestal is fit in a through hole which extends through the outer-layer wall and is in communication with the hollow.

13. The combustion device as claimed in claim 12, wherein the pedestal has a wide section disposed outside of the through hole and a narrow section fit in place in the through hole.

14. The combustion device as claimed in claim 12, wherein the pedestal defines a space in which a ballast is disposed.

15. The combustion device as claimed in claim 14, wherein the ballast protrudes into the hollow.

16. The combustion device as claimed in claim 15, wherein the inner-layer wall and the outer-layer wall are made from a transparent material.

17. The combustion device as claimed in claim 15, wherein the wick is metallic.

18. The combustion device as claimed in claim 1, wherein the inner-layer wall and the outer-layer wall are made from a transparent material.

19. The combustion device as claimed in claim 1, wherein the wick is metallic.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a perspective view of a combustion device having a double-layer structure in accordance with a first embodiment of the present invention.

(2) FIG. 2 is an exploded perspective view of the combustion device having a double-layer structure of FIG. 1.

(3) FIG. 3 is a cross-sectional view of the combustion device having a double-layer structure of FIG. 1.

(4) FIG. 4 is a perspective view of a combustion device having a double-layer structure in accordance with a second embodiment of the present invention.

(5) FIG. 5 is an exploded perspective view of the combustion device having a double-layer structure of FIG. 4.

(6) FIG. 6 is a cross-sectional view of the combustion device having a double-layer structure of FIG. 4.

DETAILED DESCRIPTION OF THE INVENTION

(7) FIGS. 1 through 3 show a combustion device 10 having a double-layer structure in accordance with a first embodiment of the present invention.

(8) The combustion device 10 includes a main body 20 which is double layered. The main body 20 is one-piece.

(9) The main body 20 includes an inner-layer wall 21 and an outer-layer wall 22 disposed outside of and spaced from the inner-layer wall 21 such that the inner-layer wall 21 and the outer-layer wall 22 include a hollow 23 disposed therebetween.

(10) The inner-layer wall 21 and the outer-layer wall 22 are made from a transparent material.

(11) The inner-layer wall 21 is in a form of a cylinder. The outer-layer wall 22 is in a form of a cylinder which has a radius greater than a radius of the inner-layer wall 21. The outer-layer wall 22 has a center disposed coaxially with a center of the inner-layer wall 21. The outer-layer wall 22 has a portion defining connecting portion 222 which extends radially from the interconnecting portion 214 to a circumference 221 of the outer-layer wall 22.

(12) The inner-layer wall 21 forms a fuel receptacle 211a with an opening 212. Fuel can be poured into the fuel receptacle 211 through the opening 212. In this regard, the main body 20 has a receiving portion 213 formed by the inner-layer wall 21 and the receiving portion 213 forms the fuel receptacle 211.

(13) The main body 20 has an interconnecting portion 214 interconnecting the inner-layer wall 21 and the outer-layer wall 22. The interconnecting portion 214 extends from an outer periphery of the inner-layer wall 21 to an inner periphery of the outer-layer wall 22. The interconnecting portion 214 is hollow.

(14) The outer-layer wall 22 is disposed on a pedestal 25. The pedestal 25 is fit in a through hole 24 which extends through the outer-layer wall 22 and is in communication with the hollow 23. The pedestal 25 has a flat bottom side that allows the combustion device 10 to be disposed on a surface stably. The pedestal 25 has a wide section 251 disposed outside of the through hole 24 and a narrow section 252 fit in place in the through hole 24. The flat bottom side of the pedestal 25 is formed on the bottom side of the wide section 251.

(15) The pedestal 25 defines a space 253 in which a ballast 26 is disposed. The space 253 is defined by the narrow section 252 of the pedestal 25. The ballast 26 protrudes into the hollow 23

(16) A wick 30 has an end defining fuel-drawing end inserted into the fuel receptacle 211a through the opening 212. The wick 30 is inserted through the interconnecting portion 214. The wick 30 has an end defining burning end disposed outside of the interconnecting portion 214 and the outer-layer wall 22. The wick 30 is metallic.

(17) A retaining device 40 securely holding the wick 30 in an upright position fit in place in the opening 212. The retaining device 40 is also fit in place in the interconnecting portion 214. The wick 30 is held by a sleeve 41 of the retaining device 40. The sleeve 41 is fit in the interconnecting portion 214 and has a flange 412 that rests on the connecting portion 222 of the outer-layer wall 22. The sleeve 41 has an outer periphery with at least one groove 411 extending thereon and at least one gasket 42 is mounted in the at least one groove 411. The at least one gasket 42 abuts a periphery of the interconnecting portion 214.

(18) FIGS. 4 through 6 show a combustion device having a double-layer structure in accordance with a second embodiment of the present invention, and the same numbers are used to correlate similar components of the first embodiment, but bearing a letter a. Similarly, the combustion device has a double layered main body 20a. The main body 20a includes an inner-layer wall 21a and an outer-layer wall 22a disposed outside of and spaced from the inner-layer wall 21a such that the inner-layer wall 21a and the outer-layer wall 22a include a hollow disposed therebetween. The inner-layer wall 21 forms a fuel receptacle 211a with an opening 212a. The main body 20 has a receiving portion 213a formed by the inner-layer wall 21a. The main body 20a has an interconnecting portion 214a interconnecting the inner-layer wall 21a and the outer-layer wall 22a. The interconnecting portion 214a) extends from an outer periphery of the inner-layer wall 21a to an inner periphery of the outer-layer wall 22a. The interconnecting portion 214a is hollow and the wick is inserted through the interconnecting portion 214a. The wick 30 has an end defining burning end disposed outside of the interconnecting portion 214a and the outer-layer wall 22a. The outer-layer wall 22a is disposed on a pedestal 25a. The pedestal 25a defines a space in which a ballast 26a is disposed

(19) The second embodiment differentiates from the first embodiment in that the main body 20a has a shape different from that of the main body 20. The inner-layer wall 21a is in a form of a sphere. The outer-layer wall 22a is in a form of a sphere which has a radius greater than a radius of the inner-layer wall 21a. The inner-layer wall 21 and the outer-layer wall 22 are disposed eccentrically.

(20) In view of the foregoing, heat emitted from the wick 30 is effectively insulated to the outer-layer walls 22 and 22a, so that the outer-layer walls 22 and 22a will not become hot. Further, an air gap between the inner-layer walls 21 and 21a and the outer-layer walls 22 and 22a effectively insulate fuel in fuel receptacles 211 and 211a from being vaporized by heat.

(21) The foregoing is merely illustrative of the principles of this invention and various modifications can be made by those skilled in the art without departing from the scope and spirit of the invention.