Rotor ventilator

Abstract

A rotor ventilator comprising a ventilator stator for mounting to a structure and a ventilator rotor for mounting and rotation with respect to the ventilator stator is disclosed. The ventilator further comprises a cover for positioning over the ventilator rotor and mounting to the ventilator stator. The cover comprises a central portion surrounded by an outer substantially concave portion. The outer concave portion of the cover may protect the ventilator from environmental conditions/elements, such as by redirecting particles, water droplets, debris and dust, etc away from the interior of the ventilator. The outer concave portion may act as a trough, from which the particles can then be directed off the cover. The trough may also act to prevent the particles from escaping over the sides of the cover, and into the ventilator.

Claims

1. A roof-mounted rotor ventilator comprising: a ventilator stator structure configured to be mounted on a roof of a building: an interior configured to be connected to a space within the building; a ventilator rotor rotatably supported by the ventilator stator, the ventilator rotor comprising one or more wind-drivable elements; and a cover mounted to and fixed relative to the ventilator stator and positioned over the ventilator rotor, such that the rotor rotates relative to the cover, and such that the one or more wind-drivable elements remain substantially exposed to the wind in-use, wherein the cover comprises a central portion surrounded by an outer portion that is substantially concave when viewed from above, wherein part of the outer substantially concave portion of the cover converges at a periphery of the cover to form a spout.

2. The ventilator as claimed in claim 1, wherein the central portion is substantially convex when viewed from above.

3. The ventilator as claimed in claim 1, wherein the cover is asymmetrical such that it extends further beyond the ventilator rotor on one side thereof.

4. The ventilator as claimed in claim 1, further comprising one or more mounts for mounting the cover to the ventilator stator.

5. The ventilator as claimed in claim 1 further comprising one or more mounts for mounting the cover to the ventilator stator, wherein the spout is substantially aligned with one of the mounts.

6. The ventilator as claimed in claim 1, wherein the ventilator stator further comprises a peripheral skirt extending therearound.

7. The ventilator as claimed in claim 6 further comprising one or more mounts for mounting the cover to the ventilator stator, wherein the mounts extend from the peripheral skirt for the cover to mount thereto.

8. The ventilator as claimed in claim 1, further comprising a channel extending from the interior of the ventilator to an exterior of the ventilator.

9. The ventilator as claimed in claim 8, wherein the channel extends along a bearing or motor support arm to a base wall of the ventilator stator.

10. The ventilator as claimed in claim 8, wherein the ventilator stator is mounted to the building to form a spacing therebetween, such that the channel extends to the spacing and to the exterior of the ventilator and building.

11. The ventilator as claimed in claim 1, wherein the rotor comprises a plurality of blades positioned and configured such that, when the ventilator is viewed in side profile, a line of sight into the interior of the ventilator is substantially restricted or obstructed.

12. The ventilator as claimed in claim 11, wherein the blades are positioned such that, when the ventilator is viewed in a sectional plan view and a line is taken extending between leading and trailing edges of each said blade, the line is unable to extend uninterruptedly into an interior of the ventilator.

13. The ventilator as claimed in claim 12, wherein the line intersects with a front blade face of an adjacent blade.

14. The ventilator as claimed in claim 11, wherein the blades are positioned such that, when viewed in side profile, each blade substantially overlaps with an adjacent blade.

15. The ventilator as claimed in claim 11, wherein each blade comprises front and back blade faces and leading and trailing edges, wherein the leading edge comprises a first lip extending along its length on the back blade face.

16. The ventilator as claimed in claim 15, wherein a channel is formed between the first lip and the back blade face.

17. The ventilator as claimed in claim 15, wherein the first lip extends along a portion of an underside edge of the back blade face.

18. The ventilator as claimed in claim 15, wherein the first lip is integrally formed with the blade.

19. The ventilator as claimed in claim 15, wherein the leading edge further comprises a second lip, extending along its length on the front blade face.

20. The ventilator as claimed in claim 19, wherein a channel is formed between the second lip and the front blade face.

21. The ventilator as claimed in claim 19, wherein the second lip extends along a portion of an underside edge of the front blade face.

22. The ventilator as claimed in claim 19, wherein the second lip is narrower than the first lip.

23. The ventilator as claimed in claim 19, wherein the first and second lips extend the same distance along the back and front blade faces, respectively.

24. The ventilator as claimed in claim 19, wherein the second lip is integrally formed with the blade.

25. The ventilator as claimed in claim 19, wherein the first and second lips extend so as to form the leading edge as an aerodynamic edge.

26. The ventilator as claimed in claim 19, wherein the trailing edge comprises an aerodynamic profile at the front blade face.

27. A roof-mounted rotor ventilator cover, the cover comprising a central portion surrounded by an outer portion that is substantially concave when viewed from above and wherein, when the cover is attached to a stator of the roof-mounted rotor ventilator and positioned over a ventilator rotor that is rotatably supported by the stator, one or more wind-drivable elements of the ventilator rotor remain substantially exposed to the wind in-use, wherein part of the outer substantially concave portion of the cover converges at a periphery of the cover to form a spout.

28. The cover as claimed in claim 27, wherein the central portion is substantially convex when viewed from above.

29. The cover as claimed in claim 27, wherein the cover is asymmetrical such that, when attached to the stator of the roof-mounted rotor ventilator, said cover extends further beyond the ventilator rotor on one side thereof.

30. A method of mounting a rotor ventilator to a pitched roof, the rotor ventilator comprising a ventilator stator and a ventilator rotor rotatably supported by the ventilator stator, the ventilator rotor comprising one or more wind-drivable elements that are substantially exposed to the wind in-use, the method comprising mounting the ventilator stator to the pitched roof such that the ventilator rotor of the rotor ventilator is substantially parallel to the roof, wherein the rotor ventilator comprises a cover, said cover comprising a central portion surrounded by an outer portion that is substantially concave when viewed from above, said cover configured to be mounted to the ventilator stator and positioned over the ventilator rotor such that the one or more wind-drivable elements remain substantially exposed to the wind in-use, wherein part of the outer substantially concave portion of the cover converges at a periphery of the cover to form a spout.

31. The ventilator as claimed in claim 1, wherein the ventilator interior is connected to the space within the building via a valve.

32. The ventilator as claimed claim 1, wherein the ventilator interior is connected to the space within the building via ducting.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Notwithstanding any other forms that may fall within the scope of the rotor ventilator, rotor ventilator cover and method as set forth in the Summary, specific embodiments will now be described, by way of example only, with reference to the accompanying drawings in which:

(2) FIG. 1 shows a perspective view of a ventilator embodiment;

(3) FIG. 2 shows a front view of the ventilator embodiment of FIG. 1;

(4) FIG. 3 shows a side view of the ventilator embodiment of FIGS. 1 and 2;

(5) FIG. 4 shows a perspective view of a ventilator cover embodiment;

(6) FIGS. 5A and 5B show two sectional views of the ventilator cover embodiment of FIG. 4;

(7) FIGS. 6A and 6B show back and front perspective views, respectively of a ventilator blade embodiment;

(8) FIG. 7 shows a schematic view of the cover embodiment shown in FIGS. 4 and 5 that overlies the arrangement of the ventilator blades;

(9) FIG. 8 shows a partial internal view of the ventilator embodiment of FIGS. 1 to 3; and

(10) FIG. 9 shows a schematic view of a house incorporating the ventilator embodiment of FIGS. 1 to 4.

DETAILED DESCRIPTION OF SPECIFIC EMBODIMENTS

(11) In the drawings, FIG. 1 shows an embodiment of a rotor ventilator 10. The ventilator 10 finds particular application as a roof-mounted ventilator, such as is shown in FIG. 9, though can be employed in other scenarios. The ventilator 10 shown comprises a ventilator stator 12, a ventilator rotor 14 and a cover 16. The stator 12 is shown mounted to flashing 18, which is used to prevent the passage of water into the structure to which the ventilator 10 is being mounted.

(12) The ventilator stator 12 comprises a base 20 that is attached to the inside of, and extends below, the flashing 18. As best shown in FIG. 9, base 20, when ventilator 10 is mounted to the roof 200 of a house 202, can attach to ducting 204, or a diverter valve 206, or directly to a truss in the roof space 208, or (where there is no roof space) to a ceiling of a living space 210.

(13) The ventilator stator 12 also comprises a body 22 that is formed by an inner wall 24 and an outer wall 26. The inner wall 24 attaches to an upstanding portion 28 of the flashing 18, with a narrow gap 30 maintained therebetween (for example, by spacers). The outer wall 26 extends from the inner wall 24, at a number of spaced braces 31, to be spaced from the inner wall 24 at an upper portion thereof. The braces 31 provide structural integrity to the body 22 and support the spaced location of outer wall 26. Further, the spacing between the inner and outer walls 24, 26 provides the necessary spacing for a rotor base plate 32, to which blades 34 are mounted, to rotate within the ventilator.

(14) The outer wall 26 is also shown having a peripheral skirt 36 that extends downwardly to prevent rain that is reflected from, or bounces off, the roof 200 from entering the interior of the ventilator 10. At the outer periphery of the peripheral skirt 36, the ventilator 10 is shown having six mounts, in the form of struts 38, to mount the cover 16 to the stator 12. The struts 38 are of a length substantially corresponding to the height of the blades 34, so that the cover 16 does not obscure the blades (thus enabling the rotor ventilator 10 to be wind-driven). The peripheral skirt 36 spaces the struts 38 from the ventilator blades 34, thus allowing the cover 16, when attached to the struts 38, to generally overlie the blades 34 and protect them from direct rain impact. These struts 38 also act as a guide to direct water down the struts 38, away from the interior of ventilator 10.

(15) The cover 16, best shown in FIGS. 4, 5A and 5B, is shown having an asymmetrical configuration. The cover 16 provides protection to the ventilator 10 from environmental conditions/elements, such as rain. The cover 16 a central convex portion 40 surrounded by an outer substantially concave portion 42. The cover 16 also has a spout 44, which is formed by parts of the concave portion 42 converging at a periphery of the cover 16. The cross sections of the cover 16, shown in FIGS. 5A and 5B, are taken on the lines A-A and B-B shown in FIG. 4. The spout 44 is formed on the part of the cover 16 which is designed to overlie the blades 34, as opposed to the extended portion 46 of the cover 16 that extends beyond the blades 34 (see FIG. 7), thus making the cover 16 asymmetric.

(16) The spout 44 is designed to be located on the low side of the ventilator 10, and the extended portion 46 is designed to be located on the high side of the ventilator 10 when it is mounted to the roof 200, as shown in FIG. 9. This allows the ventilator 10 to be mounted roof 200 such that the rotor 14 is substantially parallel to the roof line. This lowers the profile of the ventilator 10, and also makes the ventilator more efficient as airflow from the wind will generally follow the roofline and hit the blades 34 more directly than in known ventilators.

(17) The outer concave portion 42 of the cover 16 can act as a trough to direct the flow of water to the spout 44, increasing the velocity of the water to allow it to be propelled off the cover 16, to prevent it leaking into the interior of the ventilator 10. Strut 38A is substantially aligned with the spout 44, thus guiding any water which has insufficient velocity to be propelled off and away from the cover 16 down the strut 38A, away from the interior of ventilator 10.

(18) Each strut 38 is also shown having a web 48 that can direct water down the internal surface of outer wall 26, and out through an opening 50 in the lower portion of the outer wall 26. A spacing 52 is provided between the peripheral skirt 36 and the rotor base plate 32 for blades 34 to allow water at the strut 38 to be directed down the internal surface of outer wall 26 and out of opening 50 to the exterior of ventilator 10, to drain down roof 200 to guttering of the house 202. Braces 31 may also be used to guide water to openings 50.

(19) A plurality of blades 34 are mounted to the rotor base plate 32 of the ventilator rotor 12. The blades 34 each comprise a front blade face 54 and a back blade face 56. The blade 34 also comprises a leading edge 58, which is located in the interior of the ventilator 10, and a trailing edge 60 which is located at the outer portion of the ventilator 10 and is directly contacted by the wind, etc. The trailing edge 60 is shown having an aerodynamic profile 62.

(20) As best shown in FIGS. 2, 3 and 7, the blades 34 are positioned to substantially overlap with adjacent blades 34 such that, when the ventilator 10 is viewed in a sectional plan view and a line L-L (FIG. 7) is taken extending between the leading edge 58 and trailing edge 60 of the blade 34, the line L-L is unable to extend uninterruptedly into an interior of the ventilator 10. The line L-L is shown intersecting with the front blade face 54 of an adjacent blade 34. This can prevent particles, such as rain, debris, dust, ambient light, etc, from directly entering the ventilator, as the particles are not able to pass directly through the spacing S between adjacent blades 34. This forces the water to strike one of the faces 54, 56 of the various blades 34, before entering the ventilator 10.

(21) In the embodiment shown, the leading edge 58 comprises first and second lips 64, 66, respectively, extending along its length on the back and front blade faces 56, 54, respectively. The first and second lips extend to form the leading edge with an aerodynamic profile 68. Whilst this embodiment shows the leading edge 58 of the blade 34 having two such lips 64, 66, the blade may only have one such lip 64. It is preferable where only one such lip 64 is employed, that the lip be positioned on the back blade face, as more water is likely to enter the ventilator on this blade side. Further, whilst this embodiment shows the second lip 66 as being narrower than the first lip 64, the lips may be of comparable dimensions.

(22) The lips 64, 66 are shown in FIGS. 6A and 6B as being integrally formed with the blade 34 and forming a channel 70, 72, or groove, between the respective lips 64, 66 and the respective back and front blade faces 56, 54. The lips 64, 66 provide a surface to obstruct the normal flow of particles, such as droplets of water. The channels 70, 72 are used to control and direct the flow of the water and prevent it from entering the interior of the ventilator 10 in an uncontrolled manner. The lips 64, 66 may be used to redirect the particles to a specific part of the ventilator 10 interior, as shown in FIG. 8.

(23) The lips 64, 66 are also shown extending the same distance along a portion 74 of an underside edge 76 of the blade 34. Whilst not shown, the ends 78, 80 of the lips 64, 66 may be shaped to streamline the flow of water off the blade 34. FIG. 8 shows the flow path of the water travelling down lips 64, 66 and being directed past the ends 78, 80 of lips 64, 66.

(24) The ends 78, 80 of lips 64, 66 are approximately aligned with a channel, in the form of drainage channel 82, along the inner wall 24. A similar drainage channel 84 may be provided along each of the bearing or motor support arms, shown in the form of stator arms 86. The drainage channels 82, 84 are designed to direct the water to flow down the inner wall 24 of the stator body 22. As mentioned above, the inner wall 24 attaches to an upstanding portion 28 of the flashing 18, with a narrow gap 30 maintained therebetween (for example, by spacers). This allows the water to drain from the interior of ventilator 10 to the exterior of the ventilator along the drainage channel 82, 84, down the inner wall 24 and out the ventilator through the gap 30 between the inner wall 24 and the upstanding portion 28 of the flashing 18.

(25) Example

(26) A non-limiting Example of a rotor ventilator and a method of mounting the ventilator will now be described, with reference to the various embodiments as shown in FIGS. 1 to 9.

(27) A rotor ventilator 10 was mounted to the roof 200 of a house 202 such that the rotor 14 (i.e. blades 34 on rotor base plate 32) was substantially parallel to the roof line. A lower portion of base 20 was connected to a diverter valve 206, which was in turn connected to ducting 204. The ducting 204 was connected to a vent in the living space 208 of the house 202. The ventilator 10 had a cover 16 with an asymmetrical portion 46 that extended beyond the rotor 14 on the high side of the roof 200. The cover also had a spout 44 which was located on the low side of the roof 200. The cover 16 also had a central convex portion 40 surrounded by a substantially concave portion 42, with the concave portion converging at a periphery of the cover to form the spout 44.

(28) It was observed that when it rained, the interior of the ventilator 10 remained substantially dry, with little or no rain entering the interior of the ventilator.

(29) Rain that fell on the cover 16 was observed to flow from the convex portion 40 to the concave portion 42, and follow the path of the concave portion to the spout 44 at the low end of the cover 16. The water was then propelled off the cover 16 via the spout 44. Due to the outer part of the concave portion 42, water was unable to spill over the sides and into the interior of the ventilator 10.

(30) Water that was not of a sufficient velocity coming off the spout 44 was guided by strut 38A to drip off of the peripheral skirt 36 onto the roof, or via web 48 to flow through spacing 52 and down the internal surface of outer wall 26 to exit the ventilator 10 via the opening 50 between the outer wall 26 and the inner wall 24.

(31) Water that struck the roof 200 and bounced back up towards the ventilator 10 was observed to be prevented from entering the interior of the ventilator by the downwardly angled peripheral skirt 36. Any water that struck the skirt 36 remained on the outside of the ventilator 10 and drained away along the roof 200.

(32) Some water that struck the blades 34 was observed to be removed from the blades by the centrifugal forces of the blades spinning. Remnant water on the blades was observed to primarily collect on the back blade faces 56, with minimal accumulation of water on the front blade faces 54. The water on each of the faces was observed to flow towards the leading edge 58. The channels 70, 72 formed between the lips 64, 66 and the back and front blade faces 56, 54, respectively, guided the water down to their ends 78, 80. The water flowed from the ends 78, 80 down inner wall 24 and out of the ventilator via the narrow gap 30 between the flashing 18 and the inner wall 24.

(33) It will be understood to persons skilled in the art that many other modifications may be made without departing from the spirit and scope of the rotor ventilator, rotor ventilator cover and method as disclosed herein.

(34) In the claims which follow and in the preceding description, except where the context requires otherwise due to express language or necessary implication, the word comprise or variations such as comprises or comprising is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the rotor ventilator, rotor ventilator cover and method.