Field of Search:
137/525,525.1,525.3,525.5,525.7,527,512.1,517,550,512.4,357,468 138/45,46 236/93,101 251/212
Description:
BACKGROUND OF INVENTION
Vane type valves are known for controlling fluid flow as exemplified by U.S. Pat. No. 3,174,434 issued Mar. 23, 1965, to E. H. Schieve and U.S. Pat. No. 3,401,867 issued Sept. 17, 1968, to F. E. Long et al.
Valves of the foregoing type are used to control fluid flow opening and closing in response to application of pressure by the fluid medium on the valve.
One of the objects of the present invention is to provide a baffle around the valve arrangement to direct the moving fluid appropriately on the valve to effect closing.
A further principal object of the present invention is to provide a valve with particular characteristics to maintain a balance in fluid flow by having the valve partially open under predetermined conditions of temperature and/or pressure and adapted to open and close progressively in response to changes occurring in those conditions to maintain a desired equilibrium of conditions on the inside and outside of, for example, a wall.
A further principal object of the present invention is to provide a vane type valve wherein the vanes are made of dissimilar metallic materials or coupled to bimetallic elements and thereby responsive to temperature changes.
It is also an object of the present invention to provide a vane type valve wherein adjacent meeting edges of the vanes have formations thereon maintaining alignment of the adjacent abutting edges of the vanes during opening and closing of the valve and effecting a relatively quiet closure of the valve.
Valves incorporating the foregoing features are particularly suitable for controlling air flow into and out of rooms of a building or other enclosures, for example, automotive bodies. The tensile forces of the vane elements may be chosen such as to provide a valve which is partially open at predetermined atmospheric conditions and opens and closes in response to changes of the same or changes in pressure from air flow outide of the body.
SUMMARY OF INVENTION
There is provided, accordingly, in accordance with the present invention a vane type valve normally partially open in a predetermined state of atmospheric conditions and having tensile properties of the vanes so as to effect opening or closing of the valve in response to changes in those atmospheric conditions.
There is further provided in accordance with one aspect of the present invention a vane type valve which is conically shaped and having a plurality of segments tapering toward the apex. Each segment may consist of a bimetallic material or be coupled to a bimetallic element and thereby be responsive to temperature changes to effect opening and/or closing of the valve.
There is provided in accordance with a further aspect of the present invention a cone shaped vane type metallic valve circumscribed adjacent its base by a baffle so shaped as to direct moving air currents in a direction toward the valve segments.
There is provided in accordance with a further aspect of the invention a vane type valve consisting of a conically shaped body having a plurality of segments meeting at the apex with adjacent segments disposed in abutting relation and having formations on the adjacent abutting edges to maintain alignment of the adjacent segments during opening and closing of the valve and to cause progressive engagement of the edges during closure.
There is further provided in accordance with the present invention a method of controlling air flow into and out of an enclosure by a valve of the foregoing characteristics wherein such valve is normally in a partially open condition at a preselected state of atmospheric pressure and/or temperature conditions and responsive to changes in those conditions to maintain requisite air flow of conditions into and out of the enclosure so as to maintain the preselected state of conditions within the enclosure.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front elevational view of an outside wall of a building having a vane type valve mounted in a opening through the wall;
FIG. 2 is a section through the wall showing the valve of FIG. 1 mounted therein;
FIG. 3 is a view similar to FIG. 2 showing the valve in cross-section and in an open state;
FIG. 4 is a front elevational view of only the open valve shown in FIG. 3;
FIG. 5 is a cross-sectional view of a conical portion of the valve in FIG. 2 taken along section 5--5; and
FIG. 6 is a cross-sectional view similar to FIG. 3 showing a modified valve arrangement having a baffle therein.
DETAILED DESCRIPTION OF THE DRAWINGS
Referring to the drawings, there is shown a portion of a wall 10 of a building having a surface 11 exteriorly of the building and a surface 12 located interiorly of the building. The wall has an opening 13 extending therethrough and which is circumscribed on the outside wall surface 11 by a baffle 14 projecting outwardly therefrom. The baffle 14 has an inner concave surface 15 extending outwardly from the opening. The baffle 14 may be integrally formed with the wall as, for example, in a concrete wall or, alternatively, as shown in FIG. 3, the baffle may be a separate element securable to the wall.
A vane type valve 20 is mounted in the opening for controlling flow of air through the opening. The valve 20 has a cylindrical portion 21 which fits snugly into the opening 13 mounting the valve in the opening. The cylindrical wall 21 merges into a conical portion 22 pointing in a direction to the exterior of the building. The conical portion 22 has a plurality of slits 23 extending from the apex toward the cylindrical wall portion, thereby providing a plurality of vanes or leaves 24. Each vane 24 has opposed marginal edges 25 and 26 abutting marginal edges of vanes 24 adjacent thereto. The abutting edges 25 and 26 have formations thereon to maintain alignment of edges 25 and 26 of adjacent vane elements during opening and closing of the valve. As shown in FIG. 5, the formations consist of a groove 27 in edge 25 and a rib 28 in the edge 26. These edge structures, by providing a progressive meshing of the vane edges during closure, reduce the level of noise produced by the valve.
In a preferred embodiment, each vane 24 is made of bimetallic strip of material of particular characteristics or coupled to such a strip so as to be responsive to changes in air temperature for opening and closing of the valve in response to changes in temperature.
In FIG. 5 the vanes 24 consist of three laminated sheets designated 29, 30 and 31. The sheet 30 is interposed between the outer sheets 29 and 31 and offset therefrom to provide the respective groove and rib 27 and 28 in opposite edges of the vane.
One or more air filters of conventional type are mounted in the cylindrical portion of the valve. Shown in FIG. 3 are two air filters 40 and 41, each having a filtering element circumscribed by an annular ring 42 of such size as to snugly fit in the cylindrical valve portion 21. The filtering element may be any conventional fibrous or electrostatic type.
The valve element for controlling flow of air into and out of a room preferably has a normally partially open position at certain desired atmospheric conditions. Changes from those standard conditions effect opening or closing of the valve depending upon the tensile characteristics of the metal vanes. Closing of the valve is also facilitated by the baffle 14 which has an inner surface 15 curved towards the valve to direct moving air currents against the outer surface of the leaves and thereby effect closing of the valve upon movement of air above a predetermined velocity. The bimetallic strips effect opening and closing in response to temperature changes. During opening and closing adjacent edges of the vanes mate in abutting relation with opening and closing of the valve occurring by progression of effectively rolling contact or scissor-like action of the edges. Alignment of the vanes is maintained by the formations on the respective vanes.
An alternative embodiment of a valve in accordance with the present invention is illustrated in FIG. 6. In the illustrated embodiment, wall 10 is shown as having an aperture 50 therethrough. The walls of aperture 50 through wall 10 converge in a smooth curve from the outer face 11 of wall 10 to the inner face 12 of wall 10. An annular element 52 projects from wall surface 11 so as to surround opening 50. Projecting into aperture 50 from element 52 and integral with element 52 is a concave part 54 having a plurality (four in the illustrated embodiment) of opertures 56 therethrough and circumferentially spaced there about. Thus, any air passing through aperture 50 must pass through apertures 56. To progressively close the apertures 56, four vanes 58 of generally triangular configuration are mounted, at their apexes, to the mid-point of element 54 and within the cavity defined by that element. Each vane is curved from its apex to its base, the curvature being normally greater than the curvature of the inner face provided by parts 52 and 54 so that the vanes are normally spaced from the inner surface of parts 52 and 54 and the apertures 56 are normally open.
A baffle 60 of generally bulbous shape is positioned centrally of vanes 58 and is mounted in position by a threaded rod 62 extending from the inner end of baffle 60 through the centre of part 54 and provided at its innermost end, with a nut 63.
If it is desired that this valve be actuated solely by pressure, the vanes 58 may each be formed of uniform sheet of resilient material so that, by virtue of their shape, they are more flexible adjacent their apexes than adjacent their bases. Air flowing through the valve will be deflected onto the vanes 58 by baffle 60 to create a force urging them towards element 54 to close the apertures 56. The velocity of air flow is, of course, dependent on the pressure difference across wall 10 and therefore, as the pressure on face 11 of wall 10 increases with respect to the pressure on face 12 of wall 10, the vanes will progressively close access to the apertures 56 to reduce the flow therethrough or to maintain it constant, depending on the particular design properties of the vanes 58. A force of the air flow on the vanes will initially cause bending of the vanes adjacent their apexes, since, as previously mentioned, the vanes are more flexible at this point. A progressive increase in pressure on the vanes will decrease the curvature of the vanes progressively so that the vanes will move outwardly into engagement with the inner surface of element 54 progressively from their apexes towards their bases. This provides a smooth, progressive closure of the valve without excessive noise or shock loading even under the influence of wind gusts or the like.
The FIG. 6 embodiment can also be used as a thermally sensitive valve by making the vanes themselves of bimetallic material so that a change in temperature will result in a change in the curvature of the vanes for either openings or closing of the valve.
In the FIG. 6 embodiment the aperture 50 and annular element 52 may be provided by an appropriately shaped integral element of, for example, sheet metal, plastics or the like.
Also shown in FIG. 6, is a cylindrical sleeve element 64 mounted on inner face 12 of wall 10 and projecting therefrom axially aligned with two aperture 50. The sleeve 64 is constructed to receive two filter elements 66.
As an alternative arrangement, the cylindrical element 64 may be recessed into the wall in a suitably shaped portion of aperture 50. This has the effect of providing a smooth inner face 12 of wall free from any projections.
Additionally, element 64 may be integral with element 52 to provide an integral unit that can be installed in a suitably shaped opening through wall 10.
Rather than including the cylindrical element 64, the filters 66 may be of annular configuration and secured to the inner end of part 54 by nut 63 and tarbaded rod 62.
While the referred embodiment of the valve in FIG. 6 is shown and discribed as having trianglar vanes secured to part 54 at their apices, it is also possible to provide a valve having the same or similar operational properties with other shapes of vane. For example, rectangular vanes may be used, provided there are of sufficient width to cover the apertures 56. With retangular vanes, the inner, fixed ends of the vanes need not be secured to the part 54 at the centre point thereof but rather at any convenient position between the mid-point and the apertures 56. A similar connecting arrangement is equally applicable to the trianglar vane arrangement although it would be preferred that vanes connected in this matter be rather of truncated triangular form.
It is also possible to provide a valve in accordance with the FIG. 6 embodiment that is relatively shallow, i.e. wherein the part 54 has a small curvature. With this arrangement, it is possible to eliminate the baffle 60 since the air flowing past the vanes 58 and through the apertures 56 will create a sufficient pressure differential across the vanes to effect there closing.