Patent US3749526A successfully refreshed from Google Patents.
US3749526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pumping apparatus with two separated fluid systems
Assignee: Pirelli and C SpA
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Filing: 1971-05-20
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Granted: 1973-07-31
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Expires: 1991-05-20
Abstract
Abstract Pumping apparatus having a lubricating oil pumping circuit including a pump therefor and means for reversing the direction of flow, either means for reversing the pump or a reversing valve. The lubricating oil is pumped into or out of a pair of tanks, each divided into two chambers by a bellows and the oil being received by one of said chambers. The other of the chambers in each tank is part of a separate insulating oil circuit and by virtue of contraction and expansion of the bellows, pumps the insulating oil through check valves into a cable, compensating insulating oil being supplied from a storage tank through check valves to the other chambers and excess insulating oil being returned to the storage tank through an over pressure valve.
Inventors
- 👤 A Ferrentino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:14
CPC Classifications
H; H02; H02G; H02G15/00; H02G15/20; H02G15/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
410 words
Pumping apparatus comprising at least one pump for pumping oil, said pump having first and second oil pumping ports, said pump pulling oil into one said port and expelling such oil out of the other said port under pressure, means for driving said pump, first and second pressure tanks, each said tank having a bellowstype expanding diaphragm therein dividing the tank into first and second chambers, having an oil port for supplying oil to and removing oil from said first chamber and having a further port for supplying fluid to and removing fluid from said second chamber, closed, pressure duct means connecting said pump ports to the oil ports of said first and second tanks to provide a closed pumping circuit between said pump ports and said oil ports whereby Oil is pulled out of the first chamber of one said tank by said pump when oil is pumped under pressure into the first chamber of the other said tank, one said pump port being connected to one said oil port and the other said pump port being connected to the other said oil port, means for reversing the direction of flow of the oil between said pump ports and the oil ports of said tanks to thereby change the pulling of oil out of said first chamber of said one tank by said pump to the supply of oil under pressure thereto and change the supply of oil under pressure to said first chamber of said other tank to the pulling of oil out of said latter chamber by said pump, a pair of first check valves, one connected to the further port of said first tank for delivering fluid from said second chamber of said first tank to a receiver of said fluid and the other connected to the further port of said second tank for delivering fluid from said second chamber of said second tank to said receiver, a source of said fluid, a pair of second check valves, and closed, pressure duct means connecting one of said second check valves between said further port of said first tank and said source of fluid for supplying said fluid from said source thereof to said second chamber of said first tank and connecting the other of said second check valves between said further port of said second tank and said source of fluid for supplying said fluid from said source to said second chamber of said second tank.
Claim 2
Dependent Claim
410 words
Pumping apparatus comprising at least one pump for pumping oil, said pump having first and second oil pumping ports, said pump pulling oil into one said port and expelling such oil out of the other said port under pressure, means for driving said pump, first and second pressure tanks, each said tank having a bellowstype expanding diaphragm therein dividing the tank into first and second chambers, having an oil port for supplying oil to and removing oil from said first chamber and having a further port for supplying fluid to and removing fluid from said second chamber, closed, pressure duct means connecting said pump ports to the oil ports of said first and second tanks to provide a closed pumping circuit between said pump ports and said oil ports whereby Oil is pulled out of the first chamber of one said tank by said pump when oil is pumped under pressure into the first chamber of the other said tank, one said pump port being connected to one said oil port and the other said pump port being connected to the other said oil port, means for reversing the direction of flow of the oil between said pump ports and the oil ports of said tanks to thereby change the pulling of oil out of said first chamber of said one tank by said pump to the supply of oil under pressure thereto and change the supply of oil under pressure to said first chamber of said other tank to the pulling of oil out of said latter chamber by said pump, a pair of first check valves, one connected to the further port of said first tank for delivering fluid from said second chamber of said first tank to a receiver of said fluid and the other connected to the further port of said second tank for delivering fluid from said second chamber of said second tank to said receiver, a source of said fluid, a pair of second check valves, and closed, pressure duct means connecting one of said second check valves between said further port of said first tank and said source of fluid for supplying said fluid from said source thereof to said second chamber of said first tank and connecting the other of said second check valves between said further port of said second tank and said source of fluid for supplying said fluid from said source to said second chamber of said second tank.
Claim 3
Dependent Claim
79 words
Pumping apparatus as set forth in claim 1 wherein said means for reversing the direction of flow of oil between said pump ports and said oil ports comprises a distributing valve connected between said pump ports and said oil ports for alternately connecting said one pump port through closed duct means to the oil port of said first tank and said other pump port through closed duct means to the oil port of said second tank and vice versa.
Claim 4
Dependent Claim
125 words
Pumping apparatus as set forth in claim 2 wherein said distributing valve comprises electrically operable means for operating said valve and thereby reversing the direction of flow of the oil and further comprising first switch means in circuit with said electrically operable means and operable with movement of the diaphragm in said first tank to a predetermined position to change said distributor valve from a first position in which one of the alternate connections is provided to a second position in which the other of the alternate connections is provided, and second switch means in circuit with said electrically operable means and operable with movement of the diaphragm in said second tank to a predetermined position to return said distributing valve to its first position.
Claim 5
Dependent Claim
133 words
Pumping apparatus as set forth in claim 3 wherein said switch means comprises a pair of magnetically operable reed switches, one mounted in said second chamber of said first tank and one mounted in said second chamber of said second tank, and a first magnet carried by the diaphragm of said first tank and movable thereby to a position in which it operates the reed switch in the second chamber of said first tank when said diaphragm reaches a predetermined position and a second magnet carried by the diaphragm of said second tank and movable thereby to a position in which it operates the reed switch in the second chamber of said second tank when said last-mentioned diaphragm reaches a position corresponding to said predetermined position of said diaphragm in said first tank.
Claim 6
Dependent Claim
50 words
Pumping apparatus as set forth in claim 1 wherein said means for reversing the direction of flow of oil between said pump ports and said oil ports comprises means for reversing the direction of pumping of said pump controlled in accordance with the positions of the diaphragms in said tanks.
Claim 7
Dependent Claim
87 words
Pumping apparatus as set forth in claim 1 wherein said receiver is an electric cable and said fluid is an oil different from said first-mentioned oil and further comprising a pressure switch connected to the outlets of said fiRst check valves and to said means for driving said pump for starting said pump when the pressure of said fluid is below a first predetermined value and for stopping said pump when the pressure of said fluid exceeds a second predetermined value greater than said first predetermined value.
Claim 8
Dependent Claim
52 words
Pumping apparatus as set forth in claim 6 further comprising an over-pressure valve connected between the outlets of said first check valves and said source for permitting flow of fluid from said last-mentioned outlets to said source when the pressure of said fluid exceeds a value greater than said second predetermined value.
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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |