Patents Assigned to Lewa Herbert Ott GmbH & Co.
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Patent number: 7069183Abstract: In a process for the monitoring and automatic early fault detection in valves, in particular intake and/or pressure valves, of an oscillating displacement pump, in particular a membrane dosing pump, it is provided that the increased operating noise produced by a leaky valve due to the back-flow of the fluid being pumped in the closed state of the valve is used as a measure for the leakiness of the valve by the generated effective signal level being monitored continuously and compared to a reference signal level formed from the operating noise of the pump with an intact valve, where, at a predefined level deviation or change due to increased operating noise, early fault detection is triggered. A device for carrying out of this process includes a corresponding measuring device, in particular in the form of a vibration acceleration sensor measuring the produced structure-borne sound as well as a comparator device.Type: GrantFiled: May 14, 2004Date of Patent: June 27, 2006Assignee: LEWA Herbert Ott GmbH + Co. KGInventors: Eberhard Schluecker, Ralf Benken, Michael Stritzelberger
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Patent number: 7000455Abstract: In a process for the monitoring of leakage in the hydraulic pressure area of a membrane pump, processing is in a manner such that the point in time (t3), at which the snifting process serving for leakage compensation is initiated, is monitored continuously and compared with a reference value (t1), where a predetermined deviation (?t1?t3) between two values (t3 and/or t1) triggers a leakage display.Type: GrantFiled: May 14, 2004Date of Patent: February 21, 2006Assignee: LEWA Herbert Ott GmbH + Co. KGInventor: Michael Stritzelberger
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Patent number: 6884045Abstract: A hydraulically driven diaphragm pump with a diaphragm clamped at its edge between a pump body and a pump cover separating a delivery chamber from a hydraulic chamber and pretensioned in the direction of its intake stroke by spring force. A hydraulic diaphragm drive in the form of an oscillating displacement piston is displaceable in the pump body between a reservoir chamber for the hydraulic fluid and the hydraulic chamber. The diaphragm is so strongly pretensioned by spring force that it exerts a substantial compressive force on the hydraulic fluid in the hydraulic chamber. Therefore a substantial hydrostatic pressure is built up in the hydraulic chamber relative to the delivery chamber.Type: GrantFiled: September 4, 2002Date of Patent: April 26, 2005Assignee: Lewa Herbert Ott GmbH & Co.Inventors: Nils Kohlhase, Waldemar Horn, Ruediger Schnorr
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Patent number: 6598493Abstract: A multiple crank drive for working machines, in particular for diaphragm pumps, with a crankshaft, which is disposed in a housing and which exhibits at lest two bearings, can be driven by a drive, in particular a gear, and in turn drives by a crank drive, one of several piston rods of the working machines. The drive is designed in such a manner that the crankshaft is suspended in the housing.Type: GrantFiled: May 15, 2001Date of Patent: July 29, 2003Assignee: LEWA Herbert Ott GmbH & Co.Inventor: Niels Kohlhase
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Patent number: 6327960Abstract: In a diaphragm pump with a hydraulically driven diaphragm which runs in a wavy manner in the radial direction, the arrangement is such that the wavelength and/or the amplitude of the wavy formation of the diaphragm is made variable in the radial direction.Type: GrantFiled: January 19, 2000Date of Patent: December 11, 2001Assignee: LEWA Herbert Ott GmbH & Co.Inventors: Ralph Heimueller, Eberhard Schluecker
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Patent number: 5899671Abstract: For a hydraulically driven diaphragm pump with a diaphragm consisting of at least two individual layers, these layers are clamped at least in their central area between a coupling part on the feed area side and the hydraulics area side and are thus mechanically linked with one another. The coupling parts are also connected with a relay valve of a leak replenishment system which is attached in the pump body in a moveable manner.Type: GrantFiled: June 19, 1997Date of Patent: May 4, 1999Assignee: Lewa Herbert Ott GmbH & Co.Inventor: Waldemar Horn
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Patent number: 5810567Abstract: On a hydraulic diaphragm pump with a diaphragm including at least two individual layers, a dimensionally stable reinforcing element that moves together with the diaphragm and is kept in contact with the diaphragm is provided in the central area of the diaphragm. The inlet and outlet channels of the diaphragm pump open into the delivery chamber radially within the reinforcing element at least for the most part so the channels are covered accordingly by the reinforcing element.Type: GrantFiled: June 19, 1997Date of Patent: September 22, 1998Assignee: LEWA Herbert Ott GmbH & Co.Inventor: Waldemar Horn
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Patent number: 5655894Abstract: A hydraulically driven membrane pump, particularly a high pressure membrane pump, having a membrane which is held on its edges by a clamp between a pump housing and a pump cover, which membrane separates a pumping space from a hydraulic compression space, and may particularly be a metal membrane. A hydraulic membrane drive in the form of a reciprocating displacement piston is slidably mounted in a cylindrical bore in the pump housing, which piston is disposed between the compression space and a reservoir space for the hydraulic fluid. A leak replenishment device including a snuffle link in the form of a connecting channel between the compression space and the reservoir space, which snuffle link is normally closed off by an underpressure-controlled spring-loaded snuffle valve.Type: GrantFiled: May 16, 1995Date of Patent: August 12, 1997Assignee: Lewa Herbert Ott GmbH & Co.Inventor: Horst Fritsch
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Patent number: 5188515Abstract: In a diaphragm 1 for an hydraulically driven diaphragm pump provided with a device 22 for the indication of a diaphragm rupture wherein the diaphragm 1 is clamped at the margin between the pump housing 2 and pump cover 3 and comprises at least two individual layers 20, 21 between which a diaphragm interspace 19 is formed which is connected with the indicator device 22, the implementation is selected so that the individual diaphragm layers 20, 21 for the purely mechanical coupling during the pressure stroke as well as during the intake stroke are connected through a multiplicity of connecting areas 27 or 30 with the formation of interspaced free areas or free spaces.Type: GrantFiled: June 3, 1991Date of Patent: February 23, 1993Assignee: Lewa Herbert Ott GmbH & Co.Inventor: Waldemar Horn
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Patent number: 5074757Abstract: In a diaphragm pump with mechanically driven diaphragm and a device for diaphragm rutpure signaling, wherein the diaphragm 2 is clamped at the edge between a pump body 3 and pump cover 4 and is centrally firmly connected with a support plate 5 serving to drive the diaphragm, the design is such that the diaphragm is formed as a multi-layer sandwich diaphragm 2, whose individual layers or diaphragm plies are clamped jointly in the edge region between pump body 3 and pump cover 4. The sandwich diaphragm 2 consists of a working diaphragm 18 with at least one diaphragm ply and a protective diaphragm 20 also with at least one diaphragm ply. The latter is formed so that, with the working diaphragm 18 intact, it is clearly stressed by the delivery pressure less than the working diaphragm 18. Lastly the device for diaphragm rupture signaling has at least one channel 22, 25 disposed between the diaphragms 18, 20 and brought to the outside, for signaling a rupture of the working diaphragm 18.Type: GrantFiled: September 17, 1990Date of Patent: December 24, 1991Assignee: LEWA Herbert Ott GmbH & Co.Inventor: Waldemar Horn
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Patent number: 5047950Abstract: In a method and apparatus for measuring and monitoring the flow in oscillating displacement pumps, the basis for measurement used is the working principle of the pump itself and, accordingly, the mathematically unambiguous relation between the displacer kinematics and the compression or expansion time of the displacer is utilized, in particular via a microcomputer. For this purpose the compression time and expansion time are measured as the time difference between the back and the front dead point position of the plunger, respectively, and the coupling pressure peak at the beginning of the feeding process and the suction process, respectively, which is effected in particular by sensors.Type: GrantFiled: June 2, 1989Date of Patent: September 10, 1991Assignee: LEWA Herbert Ott GmbH & Co.Inventors: Horst Fritsch, Josef Benken
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Patent number: 4865528Abstract: 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.Type: GrantFiled: March 18, 1988Date of Patent: September 12, 1989Assignee: Lewa Herbert Ott GmbH & Co.Inventors: Horst Fritsch, Josef Jarosch
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Patent number: 4832581Abstract: In a diaphgram pump with a diaphragm that separates a delivery chamber from a work-chamber filled entirely with fluid medium, and with a piston chamber which is connected to the diaphragm work-chamber by way of at least two passages and in which a displacement piston is reciprocatingly movable to effect the oscillatory actuation of the diaphragm, with the passages for flushing out gas bubbles shaped in such a manner that the mean velocity of flow in each single passage is always aimed in one stroke direction. The arrangement and shape of the passages connecting the work-chamber with the piston chamber is provided here in such a manner that the total resistance to flow of all the passages, made up of the parallel resistances of the individual passages, is different in one direction of flow than that in the other direction of flow, and that thereby there results in all passages a total transport flow for any gas bubbles contained in the fluid medium.Type: GrantFiled: December 23, 1985Date of Patent: May 23, 1989Assignee: LEWA Herbert Ott GmbH & Co.Inventors: Adolf Muller, Eberhard Schlucker
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Patent number: 4811624Abstract: In a stroke adjusting device on pumps, in particular proportioning pumps, a hydraulic actuation occurs due to the fact that a hollow shaft, which guides in its interior a sliding shaft, is formed as a hydraulic cylinder, in which the sliding shaft, designed as a double action hydraulic piston, is slidable axially in both directions by means of a hydraulic fluid. Owing to this, the required axial adjusting movement of the sliding shaft is not brought out of the hollow shaft axially to the outside, whereby the two ends of the hollow shaft are kept free for the coupling of several engines or pumps.Type: GrantFiled: February 10, 1986Date of Patent: March 14, 1989Assignee: Lewa Herbert OTT GmbH & Co.Inventor: Horst Fritsch
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Patent number: 4749342Abstract: In a diaphragm pump with a diaphragm in the form of a rolling diaphragm that separates a delivery chamber from a fluid-filled pressure chamber and that with its peripheral edge is firmly clamped between a casing body and pump cover, and with an oscillating hydraulic piston which is displaceable in a bore of the casing body between the pressure chamber and a hydraulic reservoir, so as to actuate the diaphragm, the rolling diaphragm rolls alternatingly up an outer roll-off cylinder formed by the wall of the pressure chamber and off an inner roll-off cylinder formed by the peripheral surface of a support piston for the rolling diaphragm that is axially displaceable in the pressure chamber, the front surface of which support piston is connected with the corresponding surface section of the rolling diaphragm.Type: GrantFiled: December 23, 1985Date of Patent: June 7, 1988Assignee: LEWA Herbert Ott GmbH & Co.Inventor: Horst Fritsch
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Patent number: 4430048Abstract: In a diaphragm pump the diaphragm separating the delivery chamber from the working chamber is clamped between a cylinder body and a cylinder cover in pressure-balancing arrangement. For this purpose a pressure-balancing space is provided to be radially outside and to encircle said diaphragm clamping surface, the pressure balancing space communicating with the working chamber through at least one communicating passage. Furthermore, a separate annular seal member is disposed to be radially outside the pressure balancing space chamber between the cylinder cover and the cylinder body to seal-off the pressure balancing space and the working chamber from the outside. This enables the diaphragm pump to be used at discharge pressures far greater than 350 bars and simultaneously permits the use of plastic diaphragms which are reliable in operation and have a large displacement capacity.Type: GrantFiled: December 29, 1981Date of Patent: February 7, 1984Assignee: Lewa Herbert Ott GmbH & Co.Inventor: Horst Fritsch