Vane-type rotary fluid-displacing machine |
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| 申请号 | US3642390D | 申请日 | 1969-09-08 | 公开(公告)号 | US3642390A | 公开(公告)日 | 1972-02-15 |
| 申请人 | OSTBERG BERNHARD NILS; | 发明人 | OSTBERG BERNHARD NILS; | ||||
| 摘要 | A fluid-displacing machine has a rotor member and a stator member relatively rotatable about a common axis. One of the members has an internal peripheral profile that is sinuous, opposed to which the other of the members has a peripheral profile that is circular. The contour of the sinuous profile generates an odd number of evenly spaced chambers interposed by cam surfaces and is developed so that the diametral distance between its opposite profile surfaces is constant. At least one diametrally disposed vane is slidably mounted in the circular member and adapted to continuously contact and sweep the sinuous profile surface of the other member, there being inlet and discharge passages leading into and out of each chamber respectively whereby upon relative rotation of the members pumping and/or compressing action is promoted. Subordinately, novel sealing means between the vane and the sinuous profile, and pressure-assisted sealing and automatic wear takeup means for the relatively moving lateral surfaces of the machine, are provided. Disclosed also is a mathematical formula for developing the contour of the sinuous profile. | ||||||
| 权利要求 | 1. A vane-type rotary fluid displacing apparatus; comprising, an external member and an internal member relatively rotatable about a common axis, said external member having an internal peripheral surface and said internal member having an external peripheral surface, said peripheral surface of one of said members having a circular profile and said peripheral surface of the other of said members having a sinuous profile of constant diameter between opposing surfaces thereof, whereby said peripheral surfacEs form a plurality of an odd number of evenly spaced chambers interposed by cam surfaces between them; at least one diametrally disposed vane means slidably mounted in said member having a circular profile and having curved ends adapted to continuously contact the diametrally opposed surfaces of said member having a sinuous profile and sweep said surfaces of said member having a sinuous profile, whereby said vane slides in said member having a circular profile as a result of one surface of said member having a sinuous profile forcing said vane toward the diametrally opposite surface of said member having a sinuous profile; and inlet and discharge passages leading into and out of each of said chambers, whereby fluid is alternately drawn into and discharged from said chambers by the sweeping action of said vane; said sinuous profile developed in accordance with the formula: tan phi r1d theta /dr1 where: r1 the radius vector defining the position of a point representing the center of curvature of said vane end and in calculated in accordance with the formula: r1 b+(b-a) cos 3 theta , theta the deflection of said radius vector from the point of maximum deflection of simple harmonic motion, d theta /dr1 -3(b-a) sin 3 theta , a the radial distance from the center of rotation of said members to the nearest point of simple harmonic motion, b the radial distance from the center of rotation of said members to the mean position of simple harmonic motion of said point representing the center of curvature of said vane end, and theta the angle between said radius vector and the tangent to said sinuous profile. 2. Apparatus in accordance with claim 1 wherein the sinuous profile is developed in accordance with the following formula to take into consideration the radius of curvature of the vane end: where: r2 the radius vector defining the position of a second point on a line perpendicular to the tangent to the sinuous profile developed in accordance with claim 1 and displaced from the point representing the center of curvature of said vane end by a distance equal to the radius of curvature of said vane end, Iota the deflection of radius vector r2, and R said radius of curvature of said vane end. 3. Apparatus in accordance with claim 2 wherein the sinuous profile is modified to allow for a liner inside member having a sinuous profile by substituting R+t for R in the formula of claim 2, wherein: t the thickness of said liner. 4. A machine according to claim 1, wherein the external member is in the form of a casing and has a circular internal peripheral surface, while the internal member has an external peripheral surface following a sinuous profile defining three evenly spaced inwardly extending chambers interposed by three outwardly extending cam surfaces, there being two diametrally opposed vanes slidably mounted in the casing, said two vanes being connected so that they operate in unison. 5. A machine according to claim 4, wherein the casing comprises a body portion and two primary end walls rigid with said body portion and two primary said end walls having inner lateral surfaces opposed to lateral surfaces of the internal member operating within said casing, characterized by pressure-assisted sealing means for relatively moving contacting faces of said lateral surfaces, said sealing means comprising a secondary end wall disposed against or integral with one lateral surface of said internal member and defining an annular space between said secondary end wall and one of said primary end walls, the internal member and secondary end wall having limited freedom of axial movement relative to said casing, said space being utilized to apply fluid pressure between said secoNdary end wall and said one of said primary end walls thereby pressing the other lateral surface of said internal member against the other of said primary end walls to provide a pressure-assisted seal at said relatively moving contacting faces of said lateral surfaces. 6. A machine according to claim 5, wherein the fluid pressure generated by the machine is employed to provide said fluid pressure-assisted sealing by means of ducting affording fluid communication between said space and the discharge (pressure) side of the machine. 7. A machine according to claim 1, wherein the external member is in the form of a casing and has an internal peripheral surface following a sinuous profile defining three evenly spaced outwardly extending chambers interposed by three inwardly extending cam surfaces, the internal member being circular and having a diametrally disposed vane slidably mounted therein and adapted to continuously contact and sweep the casing profile. 8. A machine according to claim 7, wherein the internal member is stationary and comprised of a circular body portion having a shaft extending axially from each end of said body portion, the axis of the shafts being coincident with the center of the circular body portion and said shafts being hollow, one of the hollow shafts serving as inlet means to the inlet passages of the machine and the other of the hollow shafts serving as outlet means from the discharge passages of the machine. 9. A machine according to claim 7, wherein the diametral vane is composed of two equal, radially extending portions stressed apart by resilient means so that profile-contacting edges of the vane portions are constantly pressed against the profile surface to improve sealing. 10. A machine according to claim 9, wherein the resilient means comprises a rubber or synthetic plastic tube or rod extending transversely of the vane for the width of the vane. 11. A machine according to claim 7, and including a sealing device between the casing profile surface and the vane, which sealing device comprises a thin liner of resilient sheet material located within the casing adjacent the profile surface and conforming to the contour of the profile, the liner being separated from the profile face by a layer of elastic material, such as rubber or resilient plastic. 12. A machine according to claim 11, and including stop means to prevent the liner from distorting unduly under internal pressure, said stop means comprising inserts of strips or bands of nonelastic material interspersed in the elastic layer but of lesser thickness than the layer, thereby limiting movement of the liner into the layer. |
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