Abstract:
Flowrate in a liquid chromatography precision pump (100) employs a digital control system (128) with artificial intelligence (150). In a default flow mode, pump motor speed is controlled without using real-time pressure feedback, which speed in a pressure mode is controlled using the pump system pressure point. Pressure mode is commanded by the artificial intelligence (150) when constant displacement flow measurement time is within a desired threshold and when the higher pressure piston (34a or 34B), which is used as a constant displacement flow measurement reference, is being measured. Flow mode pressure ripple is minimized by monitoring pressure points and commanding motor (18) speed change at appropriate rotation positions of a motor shaft (24) mounted cam. In pressure mode, the artificial intelligence (150) monitors for intake cycle oscillation and optimizes a highest system pressure gain dynamically. Constant flowrate proportion is provided by activating proportioning only during a constant intake flow portion of an intake cycle.
Abstract:
A peristaltic pump comprising a drive unit (1) and a pumphead (2) comprising a pressing element (48). The pumphead (2) is connectable to the drive unit (1) such that, when connected, the pressing element (48) is driveable by the drive unit (1) to exert a peristaltic action on a tube (52) arranged within the pumphead (2). The pumhead further comprises an optical sensor, wherein the optical sensor comprises an emitter (110) and a receiver (112) which are mounted on the drive unit (1) and a reflector element (53) mounted on the pumphead (2). The reflector element (53) is arranged on the pumphead (2) such that when the pumphead (2) is connected to the drive unit (1), radiation emitted by the emitter (110) is reflected by the reflector element (53) towards the receiver (112).
Abstract:
A method for detection of a fluid leak related to at least one piston machine (1), where the method includes: - attaching a pressure sensor (18, 24) to at least a pressure side of the at least one piston machine (1); - measuring the pressure on the pressure side of the at least one piston machine (1); - attaching a transmitter (28) to the at least one piston ma-chine (1), said transmitter (28) rendering a signal for cal-culating the rotational speed of the at least one piston ma-chine (1); - calculating the speed of the at least one piston machine (1); - calculating the sum of nominal flow rates from all piston machines(1); - calculating a flow rate compensation factor; - calculating a normalized pressure (42) to be equal to the discharge pressure multiplied by the said compensation factor for the flow rate; and - monitoring the normalized pressure (42) to detect a leak-age.
Abstract:
The aim of the invention is to provide a method and a hydraulic pump with which it is possible to control pressure without separate and/or additional pressure control valves. To this end, a method is provided for controlling the hydraulic pressure provided by a hydraulic pump. Said pump has at least two pump structural elements for forming a volume which is subjected to hydraulic pressure, said structural elements being pressure-tightly connected with fixing means. The method is characterised in that at least one of the pump structural elements is arranged on another pump structural element in such a way that the latter is able to move in relation to the other pump structural element when the hydraulic pressure inside the pump exceeds a predetermined level, with the volume which is subjected to the hydraulic pressure being opened at least slightly.
Abstract:
연동 펌프는 구동 유닛(1)을 포함하며, 펌프헤드(2, 202)는 압착 요소(48, 244)를 포함한다. 펌프헤드(2, 202)는 연결된 때에 압착 요소(48, 224)가 펌프헤드(2, 202) 내에 배열된 튜브(52, 276) 상에 연동 작용을 가하도록 구동 유닛(1)에 의해 구동가능하게끔 구동 유닛(1)에 연결가능하다. 펌프헤드는 광센서를 더 포함하며, 여기서 광센서는 구동 유닛(1) 상에 장착된 방출기(110)와 수용기(112) 및 펌프헤드(2, 202) 상에 장착된 반사경 요소(53)를 포함한다. 반사경 요소(53)는 펌프헤드(2, 202)가 구동 유닛(1)에 연결된 때에 방출기(110)에 의해 방출된 방사가 반사경 요소(53)에 의해 수용기(112)로 반사되도록 펌프헤드(2, 202) 상에 구성된다.
Abstract:
PROBLEM TO BE SOLVED: To provide a metering pump having a method of self-calibration of a pump leakage at initial start-up and a health-monitoring method capable of re-calibration to compensate for pump performance losses. SOLUTION: The invention comprises a motor 16, a pump 18 driven by the motor 16 and a control section 12 and the control section 12 determines a baseline system operating function level (SOFL) associated with a baseline flow rate of the pump 18, compares the baseline SOFL with a desired SOFL associated with a desired flow rate of the pump and adjusts at least one of system operating characteristics at an initial stage to attain the desired SOFL when the baseline SOFL is different from the desired SOFL. An actual SOFL is monitored during operation of the system for a service life and adjustment of the system operating characteristic is continued to maintain the actual SOFL at the desired SOFL. COPYRIGHT: (C)2007,JPO&INPIT