US4222719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversible unidirectional fluid flow pump
Assignee: Thermo King Corp
•
Filing: 1979-01-02
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Granted: 1980-09-16
•
Expires: 1999-01-02
Abstract
Abstract A reversible gerotor pump having unidirectional fluid flow therefrom dictated by a movable eccentric ring member 30 for positioning the rotor 46 of the pump gear-set 44 in either one of two axially eccentric positions depending upon the direction of rotation of the drive shaft 20 to the pump. Movement of the eccentric ring member from one such position to the other position upon a reversal of direction of the drive shaft is caused by check valve means 70 associated with the pump inlet 68 so that, if reverse rotation of the drive shaft momentarily causes reverse flow of the pumped fluid (e.g., causes the fluid to exit through the inlet) the check valve closes and establishes a hydraulic lock between the gear-set and forces the eccentric ring member to move from the one position to the other eccentric position whereupon the fluid is once again caused to be discharged through the normal pump outlet 64 and enter through the inlet. Under these conditions, the check valve opens to permit the pumped fluid to continue to enter the pump.
Inventors
- 👤 Sigvold O. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:12
CPC Classifications
F; F04; F04C; F04C14/00; F04C14/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
270 words
In combination: a unidirectional flow liquid pump having a pump chamber with inlet and outlet openings and enclosing a reversible rotatable gear-set means for positively displacing liquid from between converging meshing teeth of said gear-set means and wherein one gear of said gear-set means is rotated on an axis eccentric from the other gear of said gear-set means, and a movable member annular said gear-set means and reversibly rotatable through an arc of approximately 180° for positioning the axis of said one gear relative to the axis of said other gear to maintain liquid discharge from said pump chamber through said outlet openings regardless of the direction of rotation of said gear-set; and check valve means serially connected in flow communication with said pump inlet, said valve having a movable plate member disposed adjacent a stationary valve seat defining a valve opening therein, said plate member movable to an open position relative to said valve opening permitting flow to said pump inlet and to a closed position on said valve seat covering said opening preventing liquid flow from said inlet through said valve so that fluid cannot be discharged from said pump inlet upon reversal of the direction of rotation of said gear-set, and upon reversal of the direction of rotation of said gear-set without said annular member rotating to a position to maintian the discharge through the pump outlet said valve means establishes a hydraulic lock between the gears of said gear-set which in turn, under continued rotation of said gear-set, moves said annular member to said position to reestablish the discharge from said pump chamber through said outlet.
Claim 2
Dependent Claim
270 words
In combination: a unidirectional flow liquid pump having a pump chamber with inlet and outlet openings and enclosing a reversible rotatable gear-set means for positively displacing liquid from between converging meshing teeth of said gear-set means and wherein one gear of said gear-set means is rotated on an axis eccentric from the other gear of said gear-set means, and a movable member annular said gear-set means and reversibly rotatable through an arc of approximately 180° for positioning the axis of said one gear relative to the axis of said other gear to maintain liquid discharge from said pump chamber through said outlet openings regardless of the direction of rotation of said gear-set; and check valve means serially connected in flow communication with said pump inlet, said valve having a movable plate member disposed adjacent a stationary valve seat defining a valve opening therein, said plate member movable to an open position relative to said valve opening permitting flow to said pump inlet and to a closed position on said valve seat covering said opening preventing liquid flow from said inlet through said valve so that fluid cannot be discharged from said pump inlet upon reversal of the direction of rotation of said gear-set, and upon reversal of the direction of rotation of said gear-set without said annular member rotating to a position to maintian the discharge through the pump outlet said valve means establishes a hydraulic lock between the gears of said gear-set which in turn, under continued rotation of said gear-set, moves said annular member to said position to reestablish the discharge from said pump chamber through said outlet.
Claim 3
Dependent Claim
35 words
Structure according to claim 1 wherein said check valve is maintained is an open position by said liquid flowing through said valve opening to said pump inlet and is normally biased to a closed position.
Claim 4
Dependent Claim
51 words
Structure according to claim 2 wherein said valve seat is inclined from a vertical position to slant downwardly in the direction of flow of liquid therethrough and said plate is hingedly attached to said seat above said opening whereby gravity normally biases said plate to a closed position covering said opening.
Claim 5
Dependent Claim
238 words
In combination: a unidirectional flow liquid pump having a pump chamber with inlet and outlet openings and enclosing a reversible rotatable gear-set means for positively displacing liquid from between converging meshing teeth of said gear-set means and wherein one gear of said gear-set means is rotated on an axis eccentric from the other gear of said gear-set means, and a movable annular member encircling said gear-set means and reversibly rotatable through a 180° arc for positioning the axis of said one gear relative to the axis of said other gear to maintain liquid discharge from said pump chamber through said outlet openings regardless of the direction of rotation of said gear-set; and a check valve serially connected in flow communication with said inlet, said check valve normally biased to an open position by liquid flowing therethrough toward said pump inlet and to a closed position by liquid under pressure to flow therethrough in the opposite direction whereupon reversal of the direction of rotation of said gear-set without said annular member moving to maintain discharge through said outlet causes said valve means to close preventing fluid discharge from said inlet and establishing a hydraulic lock between the gears of said gear-set which in turn, under continued rotation of said gear-set, moves said annular member to said position to reestablish the discharge from said pump chamber through said outlet whereupon said valve again opens to permit liquid into said pump.
Claim 6
Dependent Claim
238 words
In combination: a unidirectional flow liquid pump having a pump chamber with inlet and outlet openings and enclosing a reversible rotatable gear-set means for positively displacing liquid from between converging meshing teeth of said gear-set means and wherein one gear of said gear-set means is rotated on an axis eccentric from the other gear of said gear-set means, and a movable annular member encircling said gear-set means and reversibly rotatable through a 180° arc for positioning the axis of said one gear relative to the axis of said other gear to maintain liquid discharge from said pump chamber through said outlet openings regardless of the direction of rotation of said gear-set; and a check valve serially connected in flow communication with said inlet, said check valve normally biased to an open position by liquid flowing therethrough toward said pump inlet and to a closed position by liquid under pressure to flow therethrough in the opposite direction whereupon reversal of the direction of rotation of said gear-set without said annular member moving to maintain discharge through said outlet causes said valve means to close preventing fluid discharge from said inlet and establishing a hydraulic lock between the gears of said gear-set which in turn, under continued rotation of said gear-set, moves said annular member to said position to reestablish the discharge from said pump chamber through said outlet whereupon said valve again opens to permit liquid into said pump.
Claim 7
Dependent Claim
86 words
Structure according to claim 4 wherein said check valve includes a generally planar valve seat defining a valve opening therethrough and inclined from a vertical position to slant downwardly in the direction of normal flow of liquid therethrough and a movable plate member hingedly attached to said seat above said opening on the downstream face thereof and sized so as to cover said opening and prevent reverse flow therethrough, whereby normally flowing fluid maintains said valve open and reverse flowing fluid causes said valve to close.
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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) | 1983-09-16 | 1984-03-17 | 1984-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-16 | 1988-03-17 | 1988-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-16 | 1992-03-17 | 1992-09-16 | $7700.00 | Window Closed / Lapsed |