LED light lamps using stack effect for improving heat dissipation

1. A light-emitting lamp, comprising:

a bulb shell, defining an interior volume filled with a filling gas, the bulb shell comprising a first transparent material;

a convective accelerator, disposed within the interior volume, comprising a second transparent material, and containing a flue with first and second openings;

a light-emitting filament, disposed within the flue, comprising a plurality of semiconductor light-emitting elements, wherein when the light-emitting filament emits light to generate heat, the flue allows a convection flow of the filling gas to pass into one of the first and second openings; and

a bulb base, supporting the bulb shell and the light-emitting filament, and having electrical conductors in electrical communication with the light-emitting filament, wherein the first and the second openings have different distances apart from the bulb base.

2. The light-emitting lamp as claimed in claim 1 , wherein the bulb base is a cylinder base with an axis, and the flue is positioned substantially along the axis.

3. The light-emitting lamp as claimed in claim 1 , comprising a brace structure holding the convective accelerator within the interior volume, wherein the brace structure further provides electrical communication between the light-emitting filament and the bulb base.

4. The light-emitting lamp as claimed in claim 3 , wherein the convective accelerator has an inner sidewall, and the brace structure comprises a beam against the inner sidewall to support the convective accelerator.

5. The light-emitting lamp as claimed in claim 3 , where the brace structure comprises a fixing ring to prop again an inner sidewall of the convective accelerator.

6. The light-emitting lamp as claimed in claim 1 , comprising a brace structure holding the light-emitting filament within the flue.

7. The light-emitting lamp as claimed in claim 1 , comprising more than one light-emitting filament electrically connected in series within the convective accelerator.

8. The light-emitting lamp as claimed in claim 1 , comprising more than one light-emitting filament electrically connected in parallel within the convective accelerator.

9. The light-emitting lamp as claimed in claim 1 , wherein the convective accelerator has a midsection between the first and second openings, and a cross sectional view of the midsection has a hole larger than the first and second openings.

10. The light-emitting lamp as claimed in claim 1 , wherein the convective accelerator is a hollow cylinder.

11. The light-emitting lamp as claimed in claim 1 , wherein the convective accelerator is a hollow frustum.

12. The light-emitting lamp as claimed in claim 11 , wherein the convective accelerator is a hollow frustum of a concave cone.

13. The light-emitting lamp as claimed in claim 1 , wherein the convective accelerator is a funnel.

14. The light-emitting lamp as claimed in claim 13 , wherein the funnel is of an inverted concave cone.

15. The light-emitting lamp as claimed in claim 1 , wherein the convective accelerator is adapted to transmit at least a portion of light in the visible spectrum.

16. The light-emitting lamp as claimed in claim 1 , wherein the filling gas is an inert gas selected from a gas group consisting of noble gases and nitrogen.

17. The light-emitting lamp as claimed in claim 1 , wherein the filling gas is substantially sealed by the bulb shell and the bulb base.

18. The light-emitting lamp as claimed in claim 1 , wherein the bulb base is an Edison screw base with a foot contact and a lateral contact.

19. The light-emitting lamp as claimed in claim 1 , wherein at least one of the bulb shell, the convective accelerator and the LED filament has a radiative heat dissipation film to strongly emit thermal radiation.

20. The light-emitting lamp as claimed in claim 1 , further comprising another convective accelerator stacking on the convective accelerator.