Electronic vapor provision device

1. An electronic vapor provision device comprising a power cell, a vaporizer and a liquid store, the vaporizer including a heater and a cylindrical heater support of porous ceramic material configured to support the heater without a separate support for the heater, the heater being internally supported from its inside by the heater support, and the heater and the heater support arranged so that a longitudinal axis of the heater is perpendicular to a direction of air movement over the heater, the liquid store comprising a porous material, and the heater support being, or forming part of, the liquid store, the device further comprising a mouthpiece section, and the vaporizer being part of the mouthpiece.

2. The electronic vapor provision device of claim 1 , wherein the electronic vapor provision device is an electronic cigarette.

3. The electronic vapor provision device of claim 1 , wherein the porous material is rigid porous material.

4. The electronic vapor provision device of claim 1 , wherein the porous material is a porous ceramic material.

5. The electronic vapor provision device of claim 1 , wherein the porous material is configured for liquid retention and wicking.

6. The electronic vapor provision device of claim 1 , wherein the porous material comprises pores of substantially equal size.

7. The electronic vapor provision device of claim 1 , wherein the porous material comprises pores distributed substantially evenly throughout the porous material.

8. The electronic vapor provision device of claim 1 , wherein the porous material is configured such that a majority of a volume of the porous material comprises open pores configured for liquid storage.

9. The electronic vapor provision device of claim 1 , wherein the liquid store is sealed on at least part of an outer surface region, thereby inhibiting a porosity of that region.

10. The electronic vapor provision device of claim 1 , wherein the porous material comprises smaller pores in a region substantially adjacent to the heater, and larger pores in a region further from the heater.

11. The electronic vapor provision device of claim 1 , wherein the porous material comprises a gradient of pore sizes ranging from smaller pores proximal to the heater to larger pores distal to the heater.

12. The electronic vapor provision device of claim 1 , wherein the liquid store is configured, in use, to wick liquid onto the heater.

13. The electronic vapor provision device of claim 1 , wherein one or more gaps are defined between the heater and the heater support.

14. The electronic vapor provision device of claim 1 , wherein the heater is a heating coil.

15. The electronic vapor provision device of claim 14 , wherein the heating coil is a wire coil.

16. The electronic vapor provision device of claim 14 , wherein the heating coil is coiled so as to be supported along its length by the heater support.

17. The electronic vapor provision device of claim 14 , wherein turns of the heating coil are in contact with the heater support and are thereby supported by the heater support.

18. The electronic vapor provision device claim 14 , wherein one or more gaps are defined between the heating coil and the heater support.

19. The electronic vapor provision device of claim 18 , wherein the one or more gaps are between the coil turns and the heater support.

20. The electronic vapor provision device of claim 1 , wherein the vaporizer defines a vaporization cavity such that, in use, the vaporization cavity is a negative pressure cavity.

21. The electronic vapor provision device of claim 20 , wherein at least part of the heater is inside the vaporization cavity.

22. The electronic vapor provision device of claim 1 , wherein the liquid store forms part of the mouthpiece section.

23. The electronic vapor provision device of claim 22 , wherein the liquid store substantially fills the mouthpiece section.

24. The electronic vapor provision device of claim 1 , further comprising an outlet for vaporized liquid from the heater.

25. A mouthpiece section for an electronic vapor provision device having a power cell, the mouthpiece section comprising:

a vaporizer including a heater and a cylindrical heater support of porous ceramic material configured to support the heater without a separate support for the heater, the heater being internally supported from its inside by the heater support, and the heater and the heater support arranged so that a longitudinal axis of the heater is perpendicular to a direction of air movement over the heater; and

a liquid store comprising a porous material, the heater support being at least part of the liquid store.