US3748055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor and stator wheel construction for a turbo molecular pump
Assignee: Individual
•
Filing: 1971-07-12
•
Granted: 1973-07-24
•
Expires: 1991-07-12
Abstract
Abstract A turbo molecular pump is provided with rotor and stator wheels containing thin-walled blades each having the same thickness, with the blades extending radially outwardly from a carrier body which can be either ring or disc shaped. Each blade is shaped so that the acute angle formed between the tangential plane at any given point on its surface spaced from the axis of the wheel and the plane of the wheel decreases as the distance of the point increases from the axis of the wheel.
Inventors
- 👤 W Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:11
CPC Classifications
F; F04; F04D; F04D19/00; F04D19/02; F04D19/04; F04D19/042; F04D29/00; F04D29/26; F04D29/32; F04D29/321; F04D29/324; F04D29/40; F04D29/52; F04D29/54; F04D29/541; F04D29/542; F04D29/544
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
217 words
Turbo molecular pump incuding rotor and stator wheels, each said wheel comprising a ring of blades with the blades positioned at an angle to the plane of said wheel, wherein the improvement comprises that at least one of said rotor and stator wheels includes a carrier body, a plurality of thin wall blades each having the same thickness and secured to and extending outwardly from said carrier body, said blade being shaped so that the acute angle formed between the tangential plane at any given point on the surface of each said blade and the plane of said wheel continuously decreases as the distance of the given point on said blade extends radially outwardly from the axis of said wheel, and the equation: a/tan Alpha + d/sin Alpha 2 pi r/z being satisfied for each given point on the surface of said blade, wherein a is the dimension of said blade in the axial direction of said wheel, d is the thickness dimension of said blades, r is the distance from the axis of said wheel to the given point on the surface of said blade, z is the number of said blades on said wheel, and Alpha is the acute angle formed between the tangential plane at the given point and the plane of the wheel.
Claim 2
Dependent Claim
217 words
Turbo molecular pump incuding rotor and stator wheels, each said wheel comprising a ring of blades with the blades positioned at an angle to the plane of said wheel, wherein the improvement comprises that at least one of said rotor and stator wheels includes a carrier body, a plurality of thin wall blades each having the same thickness and secured to and extending outwardly from said carrier body, said blade being shaped so that the acute angle formed between the tangential plane at any given point on the surface of each said blade and the plane of said wheel continuously decreases as the distance of the given point on said blade extends radially outwardly from the axis of said wheel, and the equation: a/tan Alpha + d/sin Alpha 2 pi r/z being satisfied for each given point on the surface of said blade, wherein a is the dimension of said blade in the axial direction of said wheel, d is the thickness dimension of said blades, r is the distance from the axis of said wheel to the given point on the surface of said blade, z is the number of said blades on said wheel, and Alpha is the acute angle formed between the tangential plane at the given point and the plane of the wheel.
Claim 3
Dependent Claim
19 words
Turbo molecular pump, as set forth in claim 1, characterized in that said carrier body has an annular shape.
Claim 4
Dependent Claim
39 words
Turbo molecular pump, as set forth in claim 2, characterized in that at least a portion of said carrier body in the axial direction of said wheel has a larger dimension than said blades in the same axial direction.
Claim 5
Dependent Claim
35 words
Turbo molecular pump, as set forth in claim 3, characterized in that said carrier body is T-shaped in radial cross section and the head of its T-shaped section is located radially inwardly from the stem.
Claim 6
Dependent Claim
36 words
Turbo molecular pump, as set forth in claim 3, characterized in that said blades extend outwardly from the radially outer surface of said carrier body at a position thereon spaced axially from its axial end surfaces.
Claim 7
Dependent Claim
18 words
Turbo molecular pump, as set forth in claim 1, characterized in that carrier body has a solid disc-shape.
Claim 8
Dependent Claim
39 words
Turbo molecular pump, as set forth in claim 6, characterized in that at least a portion of said carrier body in the axial direction of said wheel has a larger dimension than said blades in the same axial direction.
Claim 9
Dependent Claim
40 words
Turbo molecular pump, as set forth in claim 7, characterized in that said blades extend radially outwardly from a radially outer surface of said carrier body at a position spaced axially from the axial end surfaces of said carrier body.
Claim 10
Dependent Claim
106 words
Turbo molecular pump, as set forth in claim 3, characterized in that an annular shaped housing extends in the axial direction of and encloses said wheels, an axially extending shaft positioned centrally within said housing, a plurality of said rotor wheels having carrier bodies which in the axial direction of said wheel have a larger dimension for at least a portion thereof than the axial dimension of said blades and said rotor wheels mounted on said shaft, one said stator wheel positioned between each adjacent pair of said rotor wheels, and means for securing said stator wheels in said housing spaced radially outwardly from said shaft.
Claim 11
Dependent Claim
124 words
Turbo molecular pump, as set forth in claim 6, characterized in that an annular shaped housing extends in the axial direction of and encloses said wheels, a plurality of said rotor wheels each having solid disc-shaped carrier bodies are positioned within said housing, said disc-shaped carrier bodies each having a recess on one surface transverse to the axial direction and a projection shaped to fit into the recess in another said carrier body in the oppositely disposed transverse surface so that said rotor wheels can be nesTed together within said housing, each said disc-shaped carrier body having bores formed therethrough with the bores in said carrier bodies being disposed in axial alignment, and rods extending through said bores for securing said rotor wheels together.
Claim 12
Dependent Claim
51 words
Turbo molecular pump, as set forth in claim 10, characterized in that one said stator wheel being positioned between each pair of said rotor wheels in said housing, and said stator wheels being secured within said housing with the radially inner surfaces thereof being in spaced relationship from said rotor wheels.
References Cited (Backward Citations)
NL281280A
Cited
FR519759A
Cited
US1767786A
Cited
US2011672A
Cited
US2500071A
Cited
US3477381A
Cited
US3644051A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |