Patent US2681607A successfully refreshed from Google Patents.
US4865528A
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US
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Method and arrangement for starting an hydraulic diaphragm pump against load
Assignee: Lewa Herbert Ott GmbH and Co KG
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Filing: 1988-03-18
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Granted: 1989-09-12
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Expires: 2008-03-18
Abstract
Abstract In a diaphragm pump, which is provided with at least one diaphragm (1), which separates a delivery chamber (4) from a pressure chamber (5) filled with an hydraulic fluid and is clmaped at its edge between the pump body (2) and a pump cover (3), and with an hydraulic diaphragm drive in the form of an oscillating displacement piston (6), which is displaceable in the pump body (2) between the pressure chamber (5) and a storage chamber (7) for the hydraulic fluid, a method as well as an arrangement for starting under load is provided. For this purpose on the pump drive side between the pressure chamber (5) and the storage chamber (7) a connection channel (20) is provided. This connection channel (20) during start-up of the pump leads the hydraulic fluid displaced by the displacement piston (6) in the pressure chamber (5) back into the storage chamber (7) and in the course of the further strokes of the displacement piston (6) is closable by a controlled closing device (A), so that the pressure in the pressure chamber (5) rises up to the level of the discharge pressure.
Inventors
- 👤 Horst Fritsch
- 👤 Josef Jarosch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:17
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/02; F04B43/06; F04B43/067
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
101 words
Method for starting an hydraulic diaphragm pump against load, with the actuation of a diagphram separating a delivery chamber from an hydraulic pressure chamber taking place by an oscillating displacement piston, which is displacable between the pressure chamber and an hydraulic supply, characterized in that upon pump start-up a stroke volume of the hydraulic fluid is transported by the displacement piston in an open connection path between pressure chamber and supply chamber and that, subsequently, the motion of the diaphragm is coupled to the displacement of the displacement piston in that the connection between pressure chamber and supply chamber is interrupted.
Claim 2
Dependent Claim
101 words
Method for starting an hydraulic diaphragm pump against load, with the actuation of a diagphram separating a delivery chamber from an hydraulic pressure chamber taking place by an oscillating displacement piston, which is displacable between the pressure chamber and an hydraulic supply, characterized in that upon pump start-up a stroke volume of the hydraulic fluid is transported by the displacement piston in an open connection path between pressure chamber and supply chamber and that, subsequently, the motion of the diaphragm is coupled to the displacement of the displacement piston in that the connection between pressure chamber and supply chamber is interrupted.
Claim 3
Dependent Claim
27 words
Method as stated in claim 1, characterized in that the stroke volume of the hydraulic fluid circulates in the connection path between pressure chamber and supply chamber.
Claim 4
Dependent Claim
36 words
Method as stated in claim 1, characterized in that the stroke volume of the hydraulic fluid in the connection path between pressure chamber and supply chamber due to the displacement piston flows such, that it pulsates.
Claim 5
Dependent Claim
22 words
Method as stated in claim 1, characterized in that the interruption of the connection between pressure chamber and supply chamber is controlled.
Claim 6
Dependent Claim
23 words
Method as stated in claim 1, characterized in that the interruption of the connection between pressure chamber and supply chamber takes place automatically.
Claim 7
Dependent Claim
40 words
Method as stated in claim 5, characterized in that the interruption of the connection between pressure chamber and supply chamber is brought about by the excess pressure of the hydraulic fluid occurring in the pressure chamber during the compression stroke.
Claim 8
Independent Claim
159 words
An apparatus comprising a diaphragm pump being provided with at least one diaphragm (1), which separates a delivery chamber (4) from a pressure chamber (5) filled with hydraulic fluid, is clamped at its edge between the pump body (2) and a pump cover (3), and with a hydraulic diaphragm drive in the form of an oscillating displacement piston (6), which is displaceable between the pressure chamber (5) and a supply chamber (7) for the hydraulic fluid, characterized in that on the pump drive side between the pressure chamber (5) and the supply chamber (7) a connection channel (20) is provided, which following pump start-up guides the hydraulic fluid displaced in the pressure chamber (5) by the displacement piston (6) back and which in the course of the further strokes of the displacement piston (6) is closable by a controlled closing unit (A), so that the pressure in the pressure chamber (5) increases to the level of the discharge pressure.
Claim 9
Independent Claim
159 words
An apparatus comprising a diaphragm pump being provided with at least one diaphragm (1), which separates a delivery chamber (4) from a pressure chamber (5) filled with hydraulic fluid, is clamped at its edge between the pump body (2) and a pump cover (3), and with a hydraulic diaphragm drive in the form of an oscillating displacement piston (6), which is displaceable between the pressure chamber (5) and a supply chamber (7) for the hydraulic fluid, characterized in that on the pump drive side between the pressure chamber (5) and the supply chamber (7) a connection channel (20) is provided, which following pump start-up guides the hydraulic fluid displaced in the pressure chamber (5) by the displacement piston (6) back and which in the course of the further strokes of the displacement piston (6) is closable by a controlled closing unit (A), so that the pressure in the pressure chamber (5) increases to the level of the discharge pressure.
Claim 10
Dependent Claim
54 words
An apparatus of claim 7, characterized in that the closing unit (A) has a movable closing body (23; 35, 36; 37), which is displaceable between a starting position, in which it clears the passageway of the connection channel (20), and an operating position, in which the passagway of the connection channel (20) is closed.
Claim 11
Dependent Claim
34 words
An apparatus of claim 7, characterized in that the closing body is a valve (35, 36), the valve body (35) of which cooperates with a valve seat (36) formed in the connection channel (20).
Claim 12
Dependent Claim
48 words
An apparatus of claim 7, characterized in that the closing body is a spool valve (distributing slide) (23), which is arranged in the flow path of the connection channel (20) and--by way of a through channel (27) controls the size of the passageway of the connection channel (20).
Claim 13
Dependent Claim
16 words
An apparatus of claim 7, characterized in that the closing body is a control piston (37).
Claim 14
Dependent Claim
28 words
An apparatus of one of claim 7, characterized in that the closing body (23; 35, 36; 37) is displaceable in a connecting bore (22) accessible from the outside.
Claim 15
Dependent Claim
68 words
An apparatus of claim 12, characterized in that the connecting bore (22) is arranged in a bend of the connection channel (20) in such a way that the connection channel (20) section on the pressure chamber side ends in the floor of the connecting bore (22) and the connection channel (20) section on the side of the supply chamber ends in the wall of the connecting bore (22).
Claim 16
Dependent Claim
27 words
An apparatus of claim 7, characterized in that the control of the closing body (23; 35, 36) takes place from the outside with an actuating drive (33).
Claim 17
Dependent Claim
59 words
An apparatus of claim 14, characterized in that the actuating drive (33) operates as a function of the number respectively frequency of the strokes of the displacement piston (6) in such a way that after switching on the pump the passageway of the connection channel (20) available for the displaced hydraulic fluid is decreased with each additional compression stroke.
Claim 18
Dependent Claim
52 words
An apparatus of claim 7, characterized in that control of the closing body (23; 37) takes place automatically such, that it is actuatable by the pulsating oil flow on pump compression stroke and after the pump is switched on is gradually movable from its open starting position into the closed operating position.
Claim 19
Dependent Claim
68 words
An apparatus of claim 16, characterized in that the closing body (23; 37) bounds with its one front face end a storage chamber (29) formed in the connecting bore (22), which through a valve device (30, 32) is connected to the section of the connection channel (20) on the pressure chamber side and with each compression stroke of the displacement piston (6) can be filled with hydraulic fluid.
Claim 20
Dependent Claim
43 words
An apparatus of claim 16, characterized in that the chargeable storage chamber (29) is arranged at the upper end of the closing body (23), with the closing body (23) being prestressed by a spring (28) in the direction of its open starting position.
Claim 21
Dependent Claim
53 words
An apparatus of claim 16, characterized in that the chargeable storage chamber (29) is arranged below the closing body (37), with the valve device (30, 32) connected by way of a longitudinal center bore (39) formed in the closing body (37) to the pressure chamber side part respectively section of the connection channel.
Claim 22
Dependent Claim
33 words
An apparatus of claim 16, characterized in that the valve device is a flap valve (30), which during the compression stroke of the displacement piston (6) opens toward the fillable supply chamber (29).
Claim 23
Dependent Claim
15 words
An apparatus of claim 16, characterized in that the valve device is a choke (32).
References Cited (Backward Citations)
US3433161A
Cited
DE1653512A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-11 | 1993-03-13 | 1993-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-11 | 1997-03-13 | 1997-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-11 | 2001-03-13 | 2001-09-12 | $7700.00 | Window Closed / Lapsed |