76 results about "Positive displacement meter" patented technology

A volume-based, rather than time-based, system for dispensing fluid incorporates a microprocessor-based controller, software, pump, and positive displacement flow meter. The volume being pumped and the time it takes to pump that volume is calculated and tracked by the software, giving a flow rate. This rate is then tracked by the software for any changes. Any conditional changes that occur, affecting this rate, are tracked, and if the rate becomes too excessive outside of the normal rate established at initial calibration, then an alarm or other indication is provided to the operator.

A tubing assembly is provided that can comprise a plurality of tubes or lumens that can be disposed within a head of a peristaltic pump. The tubing assembly can provide a flow rate or volume capacity that is generally equal to or greater than that achieved with a comparable prior art tube while operating at higher pressures than that possible using the prior art tube. Further, in accordance with some embodiments, the tubing assembly can achieve a longer working life than a comparable prior art tube, and the load on the pump motor can be reduced such that the pump life is increased and/or a larger pump motor is not required to achieve such advantageous results.

The number of teeth is set to 4n+2 (n is a natural number), both the ends on a long axis are set to be teeth grooves, both the ends on a short axis are set to be tips, a pitch curve is set to be, for example, an ellipse, and tooth marks 31-37, 41-47 are set to be basic tooth mark curves. With the tooth mark curve, the engagement teeth surface is set to be an involute curve, a non-engagement tooth surface is set to be a cycloid curve, and the tool pressure angle of each tooth mark is set by an undercut limit and a point limit. The non-circular gears 30, 50 bury the recess between two tooth marks, holding the tooth space located at both the ends on the long axis, based on the basic tooth mark curve, and have a shape, where the tooth section including the tip at both the ends on the short axis are scraped off, and the number of teeth completed is finally set to 4n-2. Accordingly, it is able to obtain a non-circular gear that reduces the change in an engagement pressure angle, is advantageous for setting the tool pressure angle of an engagement teeth surface, can reduce the number of teeth without forming an overhang section, and can fully secure the sealing performance with the inner wall of a casing to be installed.

A method of measuring double parameter of two ¿C phase stream by elbow and flow meter integrated system includes utilizing said system to obtain flow rate signal, differential pressure signal, fluid pressure signal and temperature signal; calculating out fluid average flow speed as per pipe section area based on obtained signals; obtaining mixed fluid density based on function relation of fluid density to elbow differential pressure and average flow rate; calculating out phase content rate of each fluid and flow rate of each phase as per fluid density of each phase . The elbow and flow meter integrated system is also provided.

The invention discloses a volumetric flowmeter with a rotor which is a high-order elliptic gear. The flowmeter consists of three parts which are a shell, two high-order elliptic gear rotors with the same size and a signal acquisition part. A function expression of a pitch curve of the high-order elliptic gear is as follows: r(phi)=A(1-k))/(1-k*cosn phi), wherein, n is a natural number greater than 2. The flowmeter which takes the high-order elliptic gear as the rotor is characterized by small pulsation, low noise, enhanced sealing performance, increased signal acquisition amount and improved overall performance.

The invention discloses an oil cylinder stroke detection and control method based on hydraulic oil volume flow. The oil cylinder stroke detection and control method is characterized by comprising thefollowing steps that the volume change amount and the flow direction of the hydraulic oil in the oil cylinder are calculated by adopting a volumetric flow meter; the leakage coefficient is considered,according to the volume change amount of the hydraulic oil in the oil cylinder, the flow direction and the sectional area of the cylinder barrel, an oil cylinder stroke calculation value expression is obtained; the actual stroke value of each time of the oil cylinder is measured and recorded manually, the obtained oil cylinder stroke calculation value is combined, the final oil cylinder stroke detection value expression is determined through linear regression, and the absolute zero point and the full stroke position of the stroke are calibrated according to the proximity switch signal; the travel controller module is used for realizing collection, parameter setting, operational processing, display and control output of the volumetric flow meter and the proximity switch signal, and the oilcylinder stroke is accurately detected and positioned; the oil cylinder, the flow meter and the travel controller module are designed into an integrated device. The oil cylinder stroke detection andcontrol method is compact in structure, is not influenced by the stroke of an oil cylinder and is low in cost, does not need special machining of the oil cylinder body, and is easy to realize.

The invention provides a device and a method for adding a liquid additive. The device comprises a storage tank, a material barrel, a connecting pipe, filters, an input pump, a central controller, a temperature controller, liquid level meters, nozzles, an adding pump, a flow meter and a control valve, wherein, the flow meter is a gear volumetric flow meter; a shell of the flow meter is internally equipped with two rotors which are directly meshed with each other and rotate under the action of pressure difference between an inlet and an outlet of the flow meter; the flow meter continuously discharges fluid which is filled in a metering space between a gear and the shell by means of rotation of the gear; and the flow meter obtains the fluid passing through the same by measuring rotating times of the gear. The device has the advantages of high and stable adding precision and accurate electrical control, thus effectively reducing labor consumption and raw material waste during the production process, and reaching an optimal service condition during the production process.

Embodiments of the invention provide devices and methods for measuring fluid volume. Devices according to some embodiments include a chamber, having a pair of gears rotatably mounted therewithin. Fluid flow through the chamber causes rotation of the gears, such that each rotation and/or partial rotation results in a known volume of the fluid passing through the chamber. An optical sensor positioned outside of the chamber, can view the rotating gears through a substantially transparent chamber wall. The optical sensor can view an optical characteristic of one or both of the gears, and based upon this data, fluid volume, flow rate, and/or flow direction can be determined. Devices and methods disclosed herein can provide for improved precision in fluid flow meter measurement. In addition, the devices and methods used herein can be more durable and easier to fabricate than previously known positive displacement flow meters.

The invention discloses a zeroing counter for a volumetric flowmeter. The zeroing counter is characterized by comprising a dual-pointer single-flow metering unit consisting of a minute hand and a hour hand, a total accumulation metering unit formed by a print wheel group, a four-jaw wheel gear connected with the transmission shaft of a flowmeter governor and a zeroing operation mechanism. The invention is the zeroing counter for the volume type flow meter which has convenient, quick and accurate counting without calculation, can directly acquire online continuous metering values and single metering values.

The invention discloses a high-temperature dynamic internal gear flowmeter. An internal gear and a shell are fixed together, and the number of small pinions can be 2 to 4. Three pinions are taken as instance for description as follows: a liquid to be measured passes through a pintle valve and a retainer through an oil inlet to enter three oil inlet cavities of the internal gear; the three pinions and the retainer are pushed to move so as to bring the oil into three oil outlet cavities of the internal gear; the oil passes through the retainer and the pintle valve to reach an oil outlet; a flow rate signal of the liquid to be measured is converted to a rotating speed signal of the retainer, and the rotating speed signal is converted to an electric signal by a rotary transducer; and the dynamic flow rate of a system to be measured is determined by the measured electric signal finally. The pinions and the retainer are made of light wear resistant materials and have small moment of inertia; the tooth number of the internal gear is a non-three interger multiple, and the flow rate realizes dislocation and superposition; the flow pulsation of the flowmeter is very small, and the flow quality is obviously improved; and because the flowmeter belongs to a volumetric flowmeter, the flowmeter is not influenced by testing environmental conditions, can accurately measure the high-pressure flow rate of a hydraulic system, has the advantages of wide measuring range, high precision, good reliability and the like, and can be widely used for measuring the flow rate of high-pressure hydraulic systems in the industries such as chemical engineering, coal mine, metallurgy and the like.

The invention discloses a movable guide rail type flowmeter. The movable guide rail type flowmeter comprises a left shell and a right shell, the left shell and the right shell are communicated in a sealed mode through a middle shell, a left metering unit is arranged in the left shell, a right metering unit is arranged in the right shell, a liquid is fed and discharged from the left shell through the left metering unit, and a liquid is fed and discharged from the right shell through the right metering unit; and a measured fluid flow channel is separated from a moving part through a sealing component; a Hall element is arranged on the outer wall of the middle shell, magnetic steel inducting the Hall element is arranged in the middle shell, and a central processing unit receives pulse electric signals sent by the Hall element and calculates flow according to the pulse electric signals. The problem of overlarge inlet and outlet pressure drop of an existing volumetric flowmeter is solved, and the beneficial effects of reducing the pressure drop of the inlet and outlet of the flowmeter, balancing the flow pulsation of a liquid outlet, reducing the internal leakage of the flowmeter, improving the measurement precision and reducing the volume of the flowmeter are achieved.

The invention discloses automatic filling equipment for an emulsion skin care product. The automatic filling equipment comprises a bracket, a mixing tank, a feeding device, a stirrer, a filling mechanism and a conveying device. The mixing tank is fixed to the bracket. The feeding device is installed on the upper portion of the mixing tank. The stirrer is arranged in an accommodating cavity of themixing tank. The filling mechanism comprises a filling pipeline. One end of the filling pipeline communicates with a discharging outlet in the bottom end of the mixing tank, and the other end of the filling pipeline communicates with a filling opening. The filling pipeline is sequentially provided with an electromagnetic control pneumatic valve, an electronic flowmeter, a liquid switching device,a volumetric flowmeter and a leakage-proof valve. The liquid switching device comprises a valve sleeve and a valve element. The valve element is internally provided with a T-shaped flowing channel hole. The filling pipeline is provided with a through hole matched with the T-shaped flowing channel hole. The automatic filling equipment is simple in structure, the to-be-filled skin care product is mixed fully and evenly and filled quickly and quantitatively, liquid leakage is avoided after filling is completed, and waste is reduced.

The invention discloses a low-pulsation gear flowmeter of a composite gear type, which is formed by enabling 2 shafts to respectively support a composite gear comprising gears 6, 7 and 8 and a composite gear comprising gears 17, 16 and 15. Each composite gear can comprise 2-4 gears axially mounted and peripherally staggered. A composite gear comprising three gears is used for explanation. Liquid to be measured enters an oil feeding cavity of the flowmeter from an oil feeding hole of the flowmeter and pushes the mutually engaged gears to rotate so that oil liquid is driven to an oil discharge cavity of the gears and is discharged from an oil discharge hole of the flowmeter, and a flow signal of the liquid to be measured is converted into a rotating speed signal of the shaft 1; then, the rotating speed signal is converted into an electric signal by an angle coder mounted on the shaft 1 to confirm the dynamic flow of a system to be measured; the mutually engaged gears, the shaft 1 and a shaft 2 can be made of light wear-resistant materials and have small rotational inertia; the number of the gears is a multiple of an integer not equal to 3, and the flow can realize staggered superposition. The flowmeter has extremely little flow pulsation, obviously improves the flow quality, belongs to a volume-type flowmeter to avoid the influence of test environmental conditions, accurately measures the dynamic flow of the high pressure of a hydraulic system, has the advantages of wide measurinog range, high precision, good reliability, and the like and can be widely applied to the flow measurement of the high-pressure hydraulic system of industries, such as aerospace, military industry, chemical industry, coal mine, metallurgy, and the like.

The invention discloses a sampling device and sampling method for massively collecting atmospheric gaseous mercury in a short term. The sampling device comprises a filter membrane box for filtering away atmospheric particulate matter, an atmospheric gaseous mercury sampling unit connected with an outlet of the filter membrane box, an instantaneous flow meter connected with the outlet end of the atmospheric gaseous mercury sampling unit, a vacuum pump connected with the outlet end of the flow meter, and a volumetric flow meter connected with an outlet of the vacuum pump, wherein the atmosphericgaseous mercury sampling unit is composed of six gold-plated quartz sand tubes and two modified conical funnels. The sampling device is capable of collecting a sufficient amount of atmospheric gaseous mercury for isotope analysis within a few hours; and equipment in the sampling device is easy to assemble and disassemble and easy to operate; sampling is simple and easy; and the accuracy is high.

An intelligent volumetric flowmeter comprises a liquid container and a communicating pipe and a lower liquid pipe which are connected with the liquid container into a whole; a nozzle is arranged on the liquid inlet of the liquid container; an electromagnetic valve is arranged on the lower liquid pipe; the communicating pipe is provided with a floater; a test tube is also sleeved on the outer side of the communicating pipe; a plurality of sets of test holes are symmetrically arranged on the test tube; the test holes are provided inside with a sensor consisting of a light-emitting diode and a reception diode. The invention leads the tested liquid to the liquid container; when the liquid is tested, the electromagnetic valve in the bottom of the liquid container is closed; the liquid level in the liquid container rises synchronously with the liquid level in the communicating pipe connected with the liquid container and drives the floater to rise. Test points are arranged outside the communicating pipe; when the floater passes, direct light emitted from the light-emitting diode is baffled and time is recorded; when the floater leaves, time is recorded; the volume between two test points is divided by the passing time to achieve the average volume flow during the time. The method has high testing precision and good adaptability of flow scope.

The invention provides a three-rotor gas volumetric flow meter which comprises a shell and a pulse generator arranged on an end cover of the shell. The meter further comprises two metering rotors anda balance rotor which are arranged in a measuring chamber in a shell, and a rotating shaft penetrates through the metering rotors and the balance rotor. The two ends of the rotating shaft abut againstand are fixed to the inner side faces of a front shell end cover and a rear shell end cover respectively, the longitudinal section of the metering rotor is H-shaped, the balance rotor is provided with a plurality of driving blades, the middle of the balance rotor is of a cylindrical structure, and the balance rotor and the metering rotors are periodically sealed and attached during rotation. TheI-shaped metering rotors are periodically attached to the introduced balance rotor in a sealed mode, the balance rotor is matched with the metering rotors to rotate together, the airflow flows more stably, balloon pulsation is effectively reduced, and equipment stability is improved.