Diaphragm Pump Research Articles

New methods for collecting Ostracoda (Crustacea) in stony sediments with methodological remarks on the separation of ostracods from sediment

New methods for sampling ostracods are described specifically for hyporheic environments and coarse sediments (i.e., pebbles and rocks). The main module is a diaphragm pump that establishes an artificial current strong enough to force individuals from their habitat. Two other methods are presented for separating living ostracods from sediment samples taking advantage of their biological and physical properties: (1) emigration out of a basket; (2) harvesting ostracods floating on the water surface.

Intelligent Control of Rehabilitation Robot: Auto Tuning PID Controller with Interval Type 2 Fuzzy for DC Servomotor

DC servomotors have been in use extensively for many applications vary from industrial to robotics to consumers. DC servomotors provide error feedback signal to its PID controller to minimize the error. However, its conventional PID controller still causes several problems such as poor accuracy in non-linear systems and poor response when there is frequent disturbance. In this research, atuning method for PID controller,i.e., Interval Type-2 Fuzzy Logic for DC servomotor is proposed. The paper proposes error and error derivative are oftype 2 fuzzy inputs to the rules and output is the corrective signal to supplement PID output. Detailed methodology and work results show that both type-1 and type-2 fuzzy logic tuning offers better response than conventional PID controller and Interval Type-2 Fuzzy Logic handles uncertainties better that Type-1.Thiscould be used as intelligent control in Rehabilitation Robots. In addition, italso provides promising potentials in robotics and medical applications that require high precision and quick response such as medical diaphragm pump, infusion pump, pharmaceutical dispenser, minimally invasive surgery, etc.

Laser-induced vibration of a thin soap film.

We report on the vibration of a thin soap film based on the optical radiation pressure force. The modulated low power laser induces a counter gravity flow in a vertical free-standing draining film. The thickness of the soap film is then higher in the upper region than in the lower region of the film. Moreover, the lifetime of the film is dramatically increased by a factor of 2. Since the laser beam only acts mechanically on the film interfaces, such a film can be employed in an optofluidic diaphragm pump, the interfaces behaving like a vibrating membrane and the liquid in-between being the fluid to be pumped. Such a pump could then be used in delicate micro-equipment, in chips where temperature variations are detrimental and even in biological systems.

Design and validation of a diaphragm pump for pediatric CRRT during ECMO

Children requiring artificial heart-lung support through extracorporeal membrane oxygenation (ECMO) are at increased risk of developing acute kidney injury (AKI). Continuous renal replacement therapy (CRRT) is the preferred method of treatment in pediatric AKI patients. CRRT devices are noted to provide inaccurate fluid balance (FB) when operated under low flow rates seen in children. We present the design and validation of a novel pump concept to provide accurate pediatric CRRT during ECMO. A diaphragm pump was prototyped with a working stroke volume (SV) of 7 mL. Fluid transport occurs by periodic expansion and contraction of a flexible membrane due to pressure fluctuations of hydraulic fluid contained below its surface. Comparison of intravenous (IV) pumps to the diaphragm pump was conducted in vitro across the range of pressures observed during CRRT in ECMO. The pump was integrated into a CRRT circuit parallel with ECMO and FB accuracy was evaluated. The pump design improved efficiency of fluid transport, with flow rate errors as low as 1-5 ml/hr as compared to IV pumps (15-50 ml/hr). The SV of IV pumps increased with source pressure in a nearly linear manner compared to the minimal variation produced by the diaphragm pump. Inclusion of the diaphragm pump in a conventional CRRT circuit with ECMO improved the FB accuracy. A novel diaphragm pump concept has been presented for providing CRRT during ECMO in the pediatric population. Improvement of the pump accuracy compared to currently used CRRT pumps was demonstrated via in vitro testing.

Born to be Wilden – alter your view of AODD Pumps

Back in 1955 Jim Wilden was looking for a quick and easy way to pump water out of a flooded workshop. His solution led to the invention of the AODD pump and his legacy the Wilden Pump & Engineering Company. Now, writes Carl Glauber, a revolutionary air distribution system enables air-operated double diaphragm (AODD) pumps to set new standards in energy efficiency, as well as optimised production.

Check valve's fault detection with wavelet packet's kernel principal component analysis

High pressure piston diaphragm pump is the most important power source of the pipeline transportation.To solve the problem of on-line monitoring on the fault of internal piston,the authors put forward a detection method based on acoustic emission signal's wavelet packet frequency and Kernel Principal Component Analysis(KPCA).Firstly,the author adopted wavelet packet to deal with the acoustic emission data to get each frequency band energy value.Secondly,the authors used KPCA to decompose the energy in high dimensional space to find the feature model,and made use of statistics SPE and T2 in feature model to make detection on fault signal.Finally,the authors conducted experiments to verify the statistics of acoustic emission of GEHO diaphragm pump's check valve.In comparison with the PCA method,the proposed method can make on-line monitoring on fault of internal piston fast and accurate,so it has good application prospect on the domain of the high pressure piston diaphragm pump's non-destructive fault detection.

Research of Piezoelectric Cantilever Beam Diaphragm Pump

The design in this paper is a rectangular piezoelectric vibrator driven Cantilever Beam Diaphragm Pump. By analyzing the working principle and characteristics of the piezoelectric cantilever beam pump, we developed the dynamics model and FEA model of the piezoelectric cantilever beam and optimized through tests the main factors that affect the output flow of the piezoelectric cantilever pump. Additionally, we designed the piezoelectric cantilever pump prototype, and by using an impedance analyzer, we measured the resonance frequencies of cantilever beams of different lengths; and we used the laser micrometer to test and measure the beams of different structures under loaded and unloaded condition. The maximum displacement of the output terminal of loaded cantilever beam is 50.5μm. Furthermore, through the experiments we tested the output flow and its corresponding variation under different diameters of transmission pistons and different excitation frequencies. Experimental tests show: when selecting the cantilever beam and the drive piston with optimal performance with the input voltage at 120V, and the frequency at 197Hz, the optimum output flow rate is 89ml/min.

Design and performance of a high pressure, flowing liquid dielectric peaking switch

A repetitive, high-voltage liquid dielectric switch for high-power microwave (HPM) applications is currently being developed and investigated at the French-German Research Institute of Saint-Louis (ISL). The switch was designed to be implemented in existing coaxial pulse line structures and is being driven by compact modular Marx generators at rise times of about 7 ns and output voltages up to 400 kV. A pumping system consisting of a gear pump and a piston diaphragm pump was installed, which allowed the operation of the switch at flow rates up to 100 ml/s and pressures up to 1800 kPa. Galden, a perfluoropolyether, was chosen as the liquid dielectric. Computational fluid dynamics (CFD) simulations of liquid flow through the switch were carried out. The results led to optimized electrode geometry with an asymmetric radial inward flow between the concave copper-tungsten electrodes and an axial outward flow through a bore hole inside the earth electrode, in order to minimize the risk of a turbulent flow through the switch. The measurements of the achievable breakdown field strength showed a significant dependency on the pressure and on the type of the Galden fluid used. A Galden fluid with a high boiling temperature is to be preferred, as it has the least tendency to contain micro gas bubbles. Maximum breakdown field strength of 10.1 MV/cm at a pressure of 2050 kPa and at a gap distance of 0.28 mm is reported using Galden HT270. This represents an increase of 270% in comparison to the breakdown field strength of 3.8 MV/cm at atmospheric pressure. The typical switch rise time was 0.49 ns; the achieved voltage rise time was 5.6×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">14</sup> V/s. Initial two-pulse experiments were carried out to investigate the achievable pulse repetition rate by charging the switch directly with a high voltage capacitor charger at a charging voltage of 50 kV and a charging time of 210 μs. The measured 90% recovery time of 4.0 ms at a pressure of 320 kPa shows the potential of the liquid dielectric switch to operate at frequencies above 200 Hz.

Numerical Simulation of Suction Valve Internal Flow Field of Large Scale Diaphragm Pump Fluid End Based on ADINA

Suction valve is a critical and vulnerable component in fluid end of large scale diaphragm pump. Slurry flowing state in suction valve affects transport efficiency and operational life span of diaphragm pump directly. It is necessary to analyze internal flow field of suction valve for confirming structural factors which affect flowing state of slurry. In this paper, suction valve of three-cylinder single-acting diaphragm pumps as a research subject, internal flow fields of suction valves which have different structures are simulated by finite element analysis software ADINA. Velocity distribution graphs and vector graphs of flow field can be obtained from analysis results. Flowing characteristic regulations affected by inner structure of valve are summarized. The research results in the paper provide some theoretical guidance for researching and developing of suction valves and relevant products.

Design of a small-scale organic Rankine cycle engine used in a solar power plant

Under the economic and political pressure due to the depletion of fossil fuels and global warming concerns, it is necessary to develop more sustainable techniques to provide electrical power. In this context, the present study aims at designing, building and testing a small-scale organic Rankine cycle (ORC) solar power plant (∼3 kWe) in order to define and optimize control strategies that could be applied to larger systems. This paper presents a first step of the design of the solar power plant and focuses more specifically on the ORC engine. This design is defined on the basis of simulation models of the ORC engine and takes into account some technical limitations such as the allowed operating ranges and the technical maturity of the components. The final configuration includes a diaphragm pump, two plate heat exchangers for the regenerator and the evaporator, an air-cooled condenser, two hermetic scroll expanders in series and R245fa as the working fluid. Simulations indicate that an efficiency close to 12% for the ORC engine can be reached for evaporating and condensing temperatures of 140 and 35°C, respectively. Copyright , Oxford University Press.

Mechanical Strength Analysis and Structure Improvement of Diaphragm Chamber Based on Finite Element Method

Diaphragm chamber is the key component in fluid end of high pressure diaphragm pump for long distance pipeline transportation. Structural dimensions are the major factors affecting mechanical strength and manufacturing cost of diaphragm chamber. In this paper, diaphragm chamber was simulated by finite element analysis software ANSYS. Mechanical strength of diaphragm chamber was checked in the light of ASMEVIII-2. The structure of diaphragm chamber was modified for the purpose of extending service life and reducing production costs. The analysis results provide some theoretical guidance for research and development of diaphragm chambers and relevant products.

Development of an Accurate Fluid Management System for a Pediatric Continuous Renal Replacement Therapy Device

Acute kidney injury is common in critically ill children, and renal replacement therapies provide a life-saving therapy to a subset of these children. However, there is no Food and Drug Administration-approved device to provide pediatric continuous renal replacement therapy (CRRT). Consequently, clinicians adapt approved adult CRRT devices for use in children because of lack of safer alternatives. Complications occur using adult CRRT devices in children because of inaccurate fluid balance (FB) between the volumes of ultrafiltrate (UF) removed and replacement fluid (RF) delivered. We demonstrate the design and validation of a pediatric fluid management system for obtaining accurate instantaneous and cumulative FB. Fluid transport was achieved via multiple novel pulsatile diaphragm pumps. The conservation of volume principle leveraging the physical property of fluid incompressibility along with mechanical coupling via a crankshaft was used for FB. Accuracy testing was conducted in vitro for 8 hour long continuous operation of the coupled UF and RF pumps. The mean cumulative FB error was <1% across filtration flows from 300 to 3000 ml/hour. This approach of FB control in a pediatric-specific CRRT device would represent a significant accuracy improvement over currently used clinical implementations.

Study and Design of Diaphragm Pump Vibration Detection Fault Diagnosis System Based on FFT

This study has proposed a fault diagnosis system based on vibration detection. The system mainly includes four modules: signal acquisition module, signal processing module, state identification module, fault diagnosis and alarm module. The system uses CMSS 2200 acceleration sensor to collect vibration signals, processing spectrum with FFT (Fast Fourier Transform) which is used effectively in current industry and finally achieve fault diagnosis and prediction for diaphragm pump. Through collection and analysis of the history signal data, set threshold value in the fault diagnosis system. According to the characteristics of different types, set the corresponding effective threshold value. The simulation results show that, the spectrum after FFT transformation processing, can really and effectively reflect equipment operating condition of the diaphragm. This system is not only simple and stable, but also can predict pump failure effectively, so that it reduces equipment downtime, plan maintenance time and unplanned maintenance time.

Experimental tests and modelization of a domestic-scale ORC (Organic Rankine Cycle)

The work deals with the realization, the experimental testing and the modelization of a small-size ORC (Organic Rankine Cycle) prototype. The main components of the circuit, filled with the refrigerant R245fa, are a plate condenser, an inverter-driven diaphragm pump, an electric boiler and a scroll expander. The latter is a hermetic device, derived from a commercial HVAC compressor, and expected to deliver a power of about 1.5 kW. Some performance parameters of the whole cycle and of the plant components have been investigated by means of a series of experimental tests, whose results are discussed in the paper. The registered working parameters and efficiencies are comparable with those expected from previous studies and reported in literature, even if the system is not yet optimized. These results are the basis for the numerical modelization of the cycle, realized with the simulation software LMS Imagine.Lab AMESim®, capable to simulate systems also in transient conditions. This model, calibrated on the basis of the experimental measurements, has revealed a good skill in predicting the main working parameters of the system, so it will be used to achieve a better knowledge of the physical system and to choose a more suitable control strategy for the prototype.

Cost Effective Strategies to Reduce CO2 Emissions in the UAE: A Literature Review

The objective of this literature review is to propose cost-effective strategies to reduce CO2 emissions in the UAE. First, fuel gas is the most suitable combustible to avoid corrosion and other technical problems in a future Carbon Capture Storage (CCS) plant. The resulting low concentration of CO2 in the absorption column could be increased by recycling part of the flue gas or using oxygen for combustion. To capture CO2, a blend of a Task Specific Ionic Liquid containing amine moiety mixed with an ionic liquid in polymer form is a potential candidate to replace the existing amine mixture. For the compression of CO2, the combined process of reciprocating compressors with inter-cooling, liquefaction and pumping with a diaphragm pump could offer a higher overall efficiency than using compressors alone. For the sequestration of CO2, the “New Generation” miscible CO2-EOR technique optimizes both oil production and CO2 storage but immiscible CO2-EOR is the recommended strategy for wells that fail the asphaltene precipitation test. Finally, if the 76 million tons of CO2 presently emitted in Abu Dhabi and nearby could be stored using the “New- Generation” and the “Second-Generation” CO2-EOR technologies, 152 billion AED could be annually added to the UAE’s economy.

INSECTICIDE CONTROL OF COTTON APHID IN CITRUS, 2012

Cotton aphid is a vector of citrus tristeza virus in citrus. A field trial was conducted in a 4-yr-old “Tango” mandarin block at the Lindcove Research and Extension Center, Exeter, California. Insecticides were applied to 10 trees per treatment using a 100 gal high pressure D30 diaphragm pump sprayer with mechanical …

Supercharger of Engine without Time Delay

Since the invention of the internal combustion engines, Automotive engineers are finding ways to increase engine power that one way is supercharger. It was developed to assist internal combustion engines in improving performance and power of the engine, But these plans have deficiency as Intercoolers and Turbo Lag and etc.but this new designed system to cause launching a diaphragm pump by use of the linear motion in suspension system then compressed air is stored in tank and by using the directional control valve 3/4 with the states of off-sport 1and sport 2 we can increase engine power. The results of torque ,BSFC(Brake specific fuel consumption) and indicator diagrams(p-v) show increased horsepower And the advantages of this plan are that we don’t have turbo lag for the sudden acceleration and also due to the air tank for supplying mass flow-rate the vehicle can cross the shallow water and submerged.

Investigations on Mechanical Stress Caused to CHO Suspension Cells by Standard and Single‐Use Pumps

AbstractMechanical stress caused to transfected Chinese hamster ovary (CHO) suspension cells by reusable and single‐use magnetically levitated, bearingless centrifugal pumps was investigated. Cell death rates were determined for different pump speeds and compared with data from a peristaltic and a 4‐piston diaphragm pump. Furthermore, the fluid distribution inside the PuraLev® 200 pump was modeled using computational fluid dynamics. The results reveal considerably lower mechanical stress to CHO cells caused by the magnetically levitated bearingless centrifugal pumps than by the peristaltic and diaphragm pump.

Dynamic Characteristics Analysis of Two-Phase Flow Diaphragm Pump Based on MATLAB and ADAMS

Two-phase flow diaphragm pump (hereafter referred to as the diaphragm pump) is a new generation pump of the reciprocating pump, which used to transport high fretting corrosion medium. At present, the diaphragm pump is widely used in many fields such as Non-ferrous metals, Chemical, Coal, Electric power and so on. The diaphragm pump is of the heart of the equipment; therefore it must have the very high reliability. As the important part of diaphragm pump, the dynamic characteristics of the power end will directly affect the behaviors and life of the solid machine. This paper introduces the work principle of the diaphragm pump, carries a simulation to the virtual prototype of the diaphragm pump based on the numerical value analyze software MATLAB and the dynamics of mechanical system simulation software ADAMS and get the relationships between the design parameters and the dynamic characteristics of the power end of diaphragm pump, which provide a theoretical basis for optimizing the diaphragm pump in the future.

Oil-Free Diaphragm Pumps for Your Laboratory

RETURN TO ISSUEPREVAdvertisementNEXTOil-Free Diaphragm Pumps for Your LaboratoryCite this: Chem. Eng. News 2012, 90, 31, 46Publication Date (Print):July 30, 2012Publication History Published online29 March 2013Published inissue 30 July 2012https://doi.org/10.1021/cen-09031-ad36Copyright © 2012 Chemical & Engineering NewsArticle Views59Altmetric-Citations-LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (2 MB) Get e-Alerts