US4513464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for controlling the acceleration of a centrifuging device
Assignee: Sulzer Escher Wyss AG
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Filing: 1983-11-22
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Granted: 1985-04-30
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Expires: 2003-11-22
Abstract
Abstract The invention relates to centrifuging devices, and particularly to the acceleration thereof to a design speed. In order to prevent imbalance (U) of the device exceeding a permitted maximum value (U m ) during acceleration, the imbalance (U) is monitored and acceleration (α) controlled as a function of temporal changes in the imbalance (U). Acceleration n/ t may be controlled in relation to the difference (ΔU) between the measured imbalance (U) and the maximum value (U m ), in relation to the rate of change (β) of the measured imbalance, or to maintain the imbalance (U) between upper (U 1 ) and lower (U 2 ) threshold values at or below the maximum value (U m ). Acceleration to the design speed can thus be accomplished with minimum delay and variation with reference to operating criteria of the device.
Inventors
- 👤 Jakob Rettich
- 👤 Leonhard Spiewok
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:14
CPC Classifications
D; D06; D06F; D06F33/00; D06F33/30; D06F33/48; D06F2103/00; D06F2103/26
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
81 words
A method for controlling the acceleration to design speed of a centrifuging device subject to variable imbalance, the method comprising the steps of measuring the imbalance as the device is accelerated; limiting speed changes of the device to a positive range of acceleration values including zero; and regulating acceleration of the device within that range solely as a function of the difference between the measured imbalance and a threshold value, whereby the acceleration period is kept short while avoiding excessive imbalance.
Claim 2
Independent Claim
81 words
A method for controlling the acceleration to design speed of a centrifuging device subject to variable imbalance, the method comprising the steps of measuring the imbalance as the device is accelerated; limiting speed changes of the device to a positive range of acceleration values including zero; and regulating acceleration of the device within that range solely as a function of the difference between the measured imbalance and a threshold value, whereby the acceleration period is kept short while avoiding excessive imbalance.
Claim 3
Dependent Claim
16 words
A method according to claim 1 wherein the threshold value is the maximum permissible imbalance value.
Claim 4
Dependent Claim
17 words
A method according to claim 1 wherein the acceleration of the device reduces as does said difference.
Claim 5
Dependent Claim
33 words
A method according to claim 1 wherein initial acceleration of the device is carried out independantly of any imbalance up to a predetermined speed, imbalance being subsequently monitored and acceleration being accordingly controlled.
Claim 6
Dependent Claim
21 words
A method according to claim 1 wherein imbalance is measured as a function of the deflection of the device during rotation.
Claim 7
Dependent Claim
25 words
A method according to claim 1 wherein imbalance is measured as a function of the forces occurring on at least one bearing of the device.
Claim 8
Dependent Claim
17 words
A method according to claim 6 wherein said at least one bearing includes an hydrostatic support piston.
Claim 9
Dependent Claim
19 words
A method according to claim 1 wherein said device is a centrifuge drum which rotates about a horizontal axis.
Claim 10
Dependent Claim
23 words
A method according to claim 1 wherein said device is a centrifuge drum of a washing machine which rotates about a horizontal axis.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-29 | 1988-10-29 | 1989-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-29 | 1992-10-29 | 1993-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-29 | 1996-10-29 | 1997-04-30 | $7700.00 | Window Closed / Lapsed |