WO1998003794B1

WO1998003794B1 - Rotary assembly

Info

Publication number: WO1998003794B1
Application number: PCT/HU1997/000039
Authority: WO
Filing date: 1997-07-17
Publication date: 1998-03-05
Anticipated expiration: 1999-01-19

Abstract

A rotary assembly consisting of a housing (10) with a cavity (13a) that is bounded by the first and the second planar walls (11, 12) as well as by a curved, closed surface (13) in-between, with inlet (14) and outlet (15) openings connecting to the cavity, the rotatably mounted shaft (20) with an axis perpendicular to the planes of planar walls is furnished by a slot (22), parallel and symmetrical to the axis of the shaft and limited within the section of the shaft inside the parallel walls of the cavity and with one or more vanes (30) fitted into the slot which divide the cavity into two or more sub-sections. The inventive idea will be carried out by means of the following technical measure. The end surfaces (31, 32) of the vane (vanes) toward the curved surface (13) of the cavity are defined by rounded curves in cross section parallel to the planar walls of the cavity, while in any such cross section the curved surface (13) of the cavity follows a non-circular curve, having a primary internal fitting point which lies on the rotational axis (21) of the shaft (20) and this non-circular curve is determined such a way that the rounded end surfaces (31, 32) of the vane (30) are in fluid-tight contact along two opposite generatrices (13c, 13d) with the curved surface of the cavity regardless the angular position of the shaft, the shaft and the internal curved surface of the cavity are also in a permanent fluid-tight contact at least along a single fixed generatrix (13e) or a range of generatrices of the curved surface; while the inlet (14) and the outlet (15) openings are on the two sides of this contact range (13e).

Claims

AMENDED CLAIMS freceived by the International Bureau on 19 January 1998 (19.01.98); original claims 1-7 replaced by new claims 1-12 (5 pages)]

1. A rotaiy assembly, for pumps, compressors, hydraulic or pneumatic motors, and internal combustion engines, comprising of a housing with a cavity, a rotor mounted rotatably to the housing with a fixed axis, the cavity having at least one inlet opening and one outlet opening, said cavity is bounded by a first planar wall and a second planar wall perpendicularly to the axis of the rotor and by at least one cylindrical surface with generatrices parallel to said axis, the circularly cylindrical outer surface of the rotor being in permanent contact with the cylindrical surface of the cavity along at least one common generatrix, the section of the rotor within the parallel planar walls of the cavity supplied by at least one through slot, parallel and symmetrical to the axis of the rotor, one fixed length, rigid vane fitted slidably into each slot, the planar surfaces of the vane perpendicular to the rotor axis being in contact with the planar surfaces of the cavity while the end surfaces of the vane, parallel to the axis of the rotor being cylindrically rounded and being in contact with the cylindrical surface of the cavity, which is ch ara ct erise d by that said cavity being divided at least to two separate chambers (13a,13 Ia), the cylindrical surfaces (13b,131b) of the chambers (13a, 131a) being in contact with the cylindrical surface of the rotor (20) along at least one fixed generatrix (13e,131e) of the chambers (13a, 131a), the chambers (13a, 131a) being separated from each other by an internal planar wall (19) perpendicular to the axis (21) of the rotor (20), each of the chambers ( 13a, L31a) having one inlet (14,141) and an outlet (15,151) opening, which are on the two opposite sides of the common generatrix (13e. l31e), said rotor (20) penetrating the internal planar wall (19) in fluid tight way and being suppHed within each of the chambers (13a, 131a) by one through slot (22,221), one sliding vane (30,301) being fitted into each of the slots (22,221), the planar surfaces of the sliding vanes (30,301) towards the internal wall (19) being in contact with on the surfaces of the wall, the sliding vanes (30,301) set to a definite angle relative to each other, in a normal cross section the cylindrical surfaces (13b, 13 lb) of the chambers (1 a, 13 la) being the outer envelope (133a) of a series of the rounding curves (31a,32a) of the end surfaces (31,32) of the vane (30), being fitted to a convex, differentiable equichordal curve (133), the fixed length chords of the equichordal curve (133) passing through the axis (21) of the rotor, consequently both rounded end surfaces (31,32) of the siding vanes (30,301) being in fluid tight contact with the cylindrical surfaces (13b,13 lb) of the chambers ( 13a, 13 la) along two generatrices (13c.13d) with a constant clearance.

2. A rotary assembly according to claim 1, which is ch r cteris ed by the rounded end surfaces (31,32) of the sliding vane (30) having generatrices parallel to the axis (21) of the rotor (20), being sections of identical, right, circular cylindrical surfaces, accordingly, in a normal cross section- the envelope (133a) of the equichordal curve (133) of the rounding curves (31a, 32a) being the outer parallel ύf the equichordal curve (133a) at the distance of the rounding radius (R) of the rounding curves (31a. 32a)

3. A rotary assembly according to claim 1 or 2. which is ch ara cterised b y the maximum local radius ( ,_n«) of the rounding curve (31 a. 32a) of the sliding vane (30) with a given width (D) being substantially equal to minimum of the maximal radii (R ) determined by the meshpoint of a straight line starting from each point of the equichordal curve (1 3) so that it is perpendicular to the tangent of the equichordal curve (1 3) at the given point and the sides parallel to the axis (21) of the sliding vane (30).

4. A rotary assembly according to any of the claims 1 through 3. which is ch ara cteris ed by the inlet opening (14) and the outlet opening (15) of the chamber (13a) extending substantially from the common generatrix (13e) right to the generatrices (1 f,]3g) determined by the opposite contact generatrices (13f,13g) of the sliding vane (30) at the position perpendicular to the plane determined by the rotational axis (21) and said common generatrix (13e).

5. A rotary assembly according to any of the claims 1. through 4 . which is ch a ra ct eris ed b y the inlet openings (14, 141) branching from a common inlet (16) and the outlet openings (15,151) leading into a common outlet (17).

6. A rotary assembly according to any of the claims 1. through 5. which is characterised by the cavity being divided into two chambers (13a, 13 la), the chambers being equivalent in size and shape and the sliding vanes (30,301) within the two chambers (13a, 131a) being perpendicular to each other.

7. A rotary assembly according to claim 6, which is chara cterised by the cylindrical surfaces (13b,131b) of the chambers (13a,131a) contacting the surface of the rotor (20) along the same common generatrix (13e) and being the chambers symmetrical against the plane (S) determined by the common generatrix (13e) and the rotational axis (21).

8. A rotary assembly according to claim 7, which is ch aracterised b y a shape of the cylindrical surfaces (13b, 13 lb) of the chambers ensuring that having a first and a second position of the rotor (20) and the sliding vanes (30,301) with a difference of an acute angle (φ), so that in the first chamber (13a) the contact generatrix (13c) of the first position sliding vane (30) which falling farther away from the common generatrix (I3e), as well as the contact generatrix (13c') of the second position of the siding vane (30') which falling also farther away from the common generatrix (13e), being situated on the same side of the symmetry plane (S); the area (Aj) being bounded by the contour line (30a) of the first position sliding vane (30) in the first chamber (13a) starting from said contact generatrix (13c) and continuing on the side facing the second position sliding vane (30'), and by the contour line (30b) on the same side of the second posflion of the vane (30') also starting from said contact generatrix (13c') and by the cylindrical surface (13b) of the chamber and by the cylindrical surface (20a) of the rotor, and the area (A₂) in the second chamber (131a) being bounded by the contour lines (301a, 30 lb) of the two sliding vane positions (301,301') starting from the contact generatrices (131c,131c'), respectively, being farther away from the common generatrix (13e), determined analogously as in the first chamber (13a), and also by the cylindrical surface (131b) of the chamber and by the surface (20a) of the rotor (20), is proportional to the acute angle (φ) and is independent of the actual first positions of the sliding vanes (30,301).

9. A rotary assembly according to claim 7, which is ch a ra cterise d b y a shape of the cylindrical surfaces (13b,131b) of the chambers ensuring that having a first and a second position of the rotor (20) and the sliding vanes (30,301) with a difference of an acute angle (φ), so that in the first chamber (13a) the contact generatrix (13 c) of the first position sliding vane (30) which falling farther away from the common generatrix (13e), as well as the contact generatrix (13c¹) of the second position of the siding vane (30') which falling also farther away from the common generatrix (13e), being situated on the same side of the symmetry plane (S); the area (Aj) being bounded by the contour line (30a) of the first position sliding vane (30) in the first chamber ( 13a) starting from said contact generatrix (13c) and continuing on the side facing the second position sEding vane (30'), and by the contour line (30b) on the same side of the second position of the vane (30') also starting from said contact generatrix (13c') and by the cylindrical surface (13b) of the chamber and by the cylindrical surface (20a) of the rotor, and the area (A.) in the second chamber (1 1a) being bounded by the contour lines (30 la, 301b) of the two shding vane positions (301,301') starting from the contact generatrices (131c,131c'), respectively, being farther away from the common generatrix (13e), determined analogously as in the first chamber (13a), and also by the cylindrical surface (131b) of the chamber and by the surface (20a) of the rotor (20), and the negative difference (A₄-A₃) of the area (A₄) in the same planar cross section of the other end of the first position shding vane (30) in the first chamber (13a) extending over the cylindrical surface (20a) of the rotor (20), and the area (A₄) determined in the same way for the second position of the sliding vane (30'), is proportional to the acute angle (φ) and is independent of the actual first positions of the sliding vanes (30,301).

10. A rotary assembly according to any of the claims 1 through 4, that is ch aracterised by the outlet (15) of the first chamber (13a) leading to the inlet (141) of the second chamber (131a), the inlet (141) being closable by a movable valve body (40) with an opening (41), and near the inlet (141) there is a fuel injection nozzle (50), and - in given case - an igniting equipment (60).

11. A rotary assembly according to claim 10, that is chara cterised b y having the valve body (40) baing mouuted directly on the rotor (20), said valve body (40) being disc shaped and having two symmetrical openings (41 ).

12. A rotary assembly according to claim 10, that is characterised by the valve body (40) connected to the rotor (20) by a synchronising equipment.

STATEMENT UNDER ARTICLE 19

Referring to the International Search Report dated November 1 , 1997, we state, that the characteristic features of our Claims can be found together in none of the following citations.

As for the subject matter of our invention: citations Nos 5 and 7 have no rotor with fixed axis, citations Nos 5 and 6 have no fixed rigid vane in the slot of the rotor, citation No 7 has no vane at all, citations Nos 2 to 7 have no vane with a curved end-surface.

So citations Nos 2 to 7 differ from our invention in the subject matter.

Regarding the characterizing clause: citations Nos 1 and 2 have no two chambers, citations Nos 6 and 7 have no internal planar wall between the chambers, citations Nos 3 to 7 have no envelope curve to the equichordal curve, and citations Nos 4, 5 and 7 comprise not even an equichordal curve.

The existence of an envelope curve to an equichordal curve is of determining importance, for the operation of such assemblies essentially differs from those without such a shape.

In the same way, an assembly having just one chamber, or two chambers with two different axes are not apt to be part of a multipurpose construction, since in this way the fisatures can not be optimalized.