Patent US4289986A successfully refreshed from Google Patents.
US4289986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coolant connecting head for an electric machine with a superconducting rotor winding
Assignee: Siemens AG
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Filing: 1979-12-19
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Granted: 1981-09-15
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Expires: 1999-12-19
Abstract
Abstract A coolant connecting head for an electric machine which contains a rotor with a superconducting winding, the head including a device for feeding a coolant from a non-rotating coolant line part into a rotating coolant line part, with at least one sealing device for sealing a space forned between these line parts with a pre-determined pressure dependent leakage rate in which, for sealing off the interspace, a further sealing device with an adjustable seal gap formed between the sealing surfaces thereof is provided so that, during the cooling down phase of the winding, the coolant leakage rate can be kept low with this further sealing device.
Inventors
- 👤 Dieter Kullmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 02:09
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/14; F16L59/16; F16L59/18; F16L59/185; H; H02; H02K; H02K55/00; H02K55/02; H02K55/04; H02K9/00; H02K9/19; H02K9/197; Y; Y02; Y02E; Y02E40/00; Y02E40/60; Y10; Y10S; Y10S285/00; Y10S285/904; Y10S505/00; Y10S505/825; Y10S505/876; Y10S505/877; Y10S505/878
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
159 words
In a coolant connecting head for an electric machine, which machine contains a rotor supported rotatably about an axis a superconducting winding which can be deep cooled by a coolant, and a device for feeding the coolant from a nonrotating coolant line part into a rotating coolant line part connected to the rotor, and containing at least one sealing device which seals off an interspace formed between these line parts and which, in the operating state of the machine, allows a predetermined leakage rate which depends on the pressure difference prevailing there, the improvement comprising at least one further sealing device with an adjustable seal gap formed between the sealing surfaces thereof for sealing the interspace, whereby said seal gap may be adjusted according to the operating condition of the electric machine so as to be fully effective during the cooling down phase and adjusted to be no longer fully effective after the machine has reached its nominal speed.
Claim 2
Dependent Claim
159 words
In a coolant connecting head for an electric machine, which machine contains a rotor supported rotatably about an axis a superconducting winding which can be deep cooled by a coolant, and a device for feeding the coolant from a nonrotating coolant line part into a rotating coolant line part connected to the rotor, and containing at least one sealing device which seals off an interspace formed between these line parts and which, in the operating state of the machine, allows a predetermined leakage rate which depends on the pressure difference prevailing there, the improvement comprising at least one further sealing device with an adjustable seal gap formed between the sealing surfaces thereof for sealing the interspace, whereby said seal gap may be adjusted according to the operating condition of the electric machine so as to be fully effective during the cooling down phase and adjusted to be no longer fully effective after the machine has reached its nominal speed.
Claim 3
Dependent Claim
47 words
The improvement according to claim 1, wherein the coolant line parts contain tube end sections which are arranged concentrically to each other and in part enclose each other, and wherein said further sealing device is disposed at the end face of one of the tube end sections.
Claim 4
Dependent Claim
15 words
The improvement according to claim 2 wherein said further sealing device comprises a sliding seal.
Claim 5
Dependent Claim
27 words
The improvement according to claim 1, wherein said seal gap extends in a plane radial with respect to the axis of rotation of said further sealing device.
Claim 6
Dependent Claim
39 words
The improvement according to claim 2, wherein said further sealing device contains a non-rotating seal part which is mechanically connected to the non-rotating tube end section and wherein said tube end section can be moved in the axial direction.
Claim 7
Dependent Claim
28 words
The improvement according to claim 2, wherein the rotating sealing surface of said further sealing device is located at the end face of the rotating tube end section.
Claim 8
Dependent Claim
49 words
The improvement according to claim 5 or 6, and further including a pre-tensioned spring system acting on the non-rotating tube end section adapted to generate a predetermined axial pressure of the seal parts of said further sealing device at low speed of the machine onto their common sealing surface.
Claim 9
Dependent Claim
26 words
The improvement according to claim 7, and further including an adjustable stop for limiting the maximum spring travel of the spring system to a predetermined length.
Claim 10
Dependent Claim
37 words
The improvement according to claim 1 and further including a stop for adjusting the seal gap of the further sealing device to a defined minimum distance of the seal surfaces at the nominal speed of the machine.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |