94results about How to "Constant flow rate" patented technology

The invention relates to a gravity drive microfluidic device for preparing a monodispersed emulsion and a method thereof, which is characterized in that a microfluidic system is driven by utilizing the constant flow rate generated by means of the constant gravity action of fluid columns with different heights based on the microfluidic device; liquid drops with different and even volumes are formed by utilizing the action of a shearing force, the surface tension and the like of the continuous phase fluid to the dispersed phase fluid; and microspheres meeting the requirements on bioanalysis and carriers of proteins, genes, medicine screening and the like are formed by solidification, drying or ultraviolet irradiation polymerization. The device of the invention comprises a microfluidic control device support component, a constant sample introduction component, a fluid pipeline, a microfluidic control channel component and a continuous sample adding component, wherein the heights of two-phase liquid columns are automatically controlled by controlling a two-phase mechanical motor; the liquid columns with different heights drive the fluid to generate the constant speed; the continuous-phase fluid for driving the microfluidic control device is used for shearing the dispersed phase liquid to prepare the liquid drops with the different volumes; and the large-scale and continuous preparation of the liquid drops can be realized by the continuous sample adding component and the constant sample introduction component.

The present invention relates to a large freezing test model box and large freezing simulation test platform. The platform comprises: a groundwater circulation system, a formation simulation system, arefrigeration cycle system and a monitoring system, therein the formation simulation system is used to simulate distribution of different soil layers, the groundwater circulation system is used to simulate different groundwater flow rates, and the refrigeration cycle system is used to simulate the formation freezing construction scheme under different working conditions, and the monitoring systemis used to record a change trend of each monitoring quantity during a freezing process. The large freezing test model box and simulation test platform can simulate groundwater flow in a test soil layer to the greatest extent, analyse temperature field expansion and variation law through automatic data acquisition and processing, and study forming process of frozen walls (curtains) or bottom plates, determine thickness control variables, and obtain relationship between groundwater flow rate and freezing temperature field and freezing design parameters, and optimize freezing design scheme, andpropose corresponding measures.

Diecasting machine for production of mouldings from thixotropic metal billets, containing a sprue system which connects a cylindrical casting chamber cavity with a moulding cavity, where the sprue system has a cylindrical sprue cavity immediately adjacent to the casting chamber cavity and contains at least one sprue, and all sprues lead laterally away from the generated surface of the sprue cavity and each sprue has a concentric center line and at its end facing towards the moulding cavity has an inlet opening for introduction of the thixotropic metal alloy into the moulding cavity, and the sprue system is connected to the casting chamber cavity by a passage opening perpendicular in relation to a concentric longitudinal axis of the cylindrical casting chamber cavity, wherein each sprue has a circular or elliptical cross section with a substantially constant cross sectional area over its entire length.

The invention discloses a humidifying process for high-moisture charged coking coal. The process comprises the following steps of: pre-humidifying the high-moisture charged coking coal; sieving coal particles; smashing and separating large-particle coal; humidifying charged coking coal; recycling a low-grade heat source; and dedusting and pelletizing. The humidifying process has the advantages of high humidifying performance, large humidifying range, low energy consumption, low air pollution and convenience for maintaining and repairing.

The invention discloses a miniature measurement and control system fit for a high-field asymmetric waveform transference tube. The system comprises a man-machine interaction module, an upper computer system and a measurement and control circuit module, wherein the measurement and control circuit module comprises a plurality of sub-circuit modules; an operator sends an operation command and observes a detection result through a friendly instrument operation interface provided by the upper computer system and the man-machine interaction module; the upper computer system is connected with the sub-circuit modules in the measurement and control circuit module; and the sub-circuit modules are connected with corresponding components in the high-field asymmetric waveform transference tube to generate measuring signals necessary for detecting substance ingredients of the high-field asymmetric waveform transference tube and detect a signal output by the high-field asymmetric waveform transference tube at high precision. The miniature measurement and control system provided by the invention is fit for high-field asymmetric waveform transference tubes with different sizes and manufactured by various techniques, and the system has the advantages of low noise, high integration degree, good reliability and anti-interference capability, and quick and simple operation, and the like.

The invention provides a device and method for detecting the performance of functional material activated water, which relate to water treatment. The device mainly comprises six parts including a raw water storage tank, a water treatment bed, an activated water storage tank, a detection and control unit, a water quality detection and control unit and a data processing unit, wherein the potential of hydrogen (pH) values and the oxidation reduction potential (OPR) of raw water and activated water are detected in real time in an on-line way by a raw water pH electrode and a raw water ORP electrode as well as an activated water pH electrode and an activated water ORP electrode; detected data is transmitted into the data processing unit by the water quality detection and control unit; and a real-time data curve and a history data curve can be displayed after data analysis and operation, and test results can be obtained. The device and the method can simply and rapidly detect the performance of the functional material activated water, so that materials with excellent performance for activating animal drinking water can be screened out.

The invention provides a circulating water heating system of a secondary pump, consisting of a heating medium water inlet pipe, a heating medium water return pipe, a heat exchanger, a primary pump, a secondary pump, a bypass flow water mixer, a temperature control valve, a control cabinet and a tail-end heat user. The circulating water heating system is characterized in that the heating medium water inlet pipe is connected with a primary side inlet of the heat exchanger through the temperature control valve; the heating medium water return pipe is connected with the primary side outlet of the heat exchanger; a secondary side outlet of the heat exchanger is connected with a primary water inlet of the bypass flow water mixer through the primary water supply pipe; the primary water outlet of the bypass flow mixer is connected with the primary pump through the primary water return pipe and than is butted with a secondary side inlet of the heat exchanger. The invention adopts the primary pump constant flow and the secondary pump constant flow to operate so as to ensure that the system can automatically adapt to the load change of the tail-end heat user, controls the water supply temperature of the primary water supply pipe by matching outdoor temperature variation, and has the characteristics of reasonable design, reliable operation, high efficiency, energy saving, capability of automatically adapting to the flow variation of the secondary side tail-end heat user, and the like. The invention is particularly suitable for large and medium circulating water heating systems.

The intelligent cerebrospinal fluid replacing instrument consists of two parts, including a disposable replacing cylinder and a driving and controlling device capable of being reused. Inside the replacing cylinder with replacing port for the drainage pipe to be connected on and sucker, artificial cerebrospinal fluid is held. The driving and controlling device includes mainly a mechanical driving unit and an automatic control unit. The present invention has a program driven pushing and sucking pump with constant speed and constant displacement, and parameters capable of being set based on disease condition, so that it has intelligently controlled speed, time and pushing and sucking amount of the replaced cerebrospinal fluid and is scientific, accurate, safe and efficient.

The invention discloses an efficient hydraulic circulation clarifier and aims to provide a circulation clarifier which is high in operation stability, reduces chemical and energy consumption, can better adapt to changes of water volume and water quality during actual operation and reduces operation cost of water treatment facilities. The efficient hydraulic circulation clarifier adopts a method implemented according to the following steps: firstly, raw water enters a water inlet pipe at the clarifier bottom, is sprayed into a Venturi tube at a high speed through a spray nozzle and a horn mouth, so that vacuum is formed near the horn mouth in the lower part of the Venturi tube and sucks a large amount of backflow sludge, the backflow sludge and the raw water mix and react fiercely in the Venturi tube, and then a product enters a first flocculation basin and a second flocculation basin; a sludge and raw material mixed solution overflowing from the second flocculation basin is subjected to sludge-water separation in a separation chamber in a settling region, clear water moves upwards and is collected by a water collection tank and drained outward, one part of the settled sludge enters an automatic sludge discharge pipe, and the other part of the settle sludge is sucked by the Venturi tube, enters a reaction system and is recycled continuously.

The invention relates to a device and method for measuring the infiltration rate of a sponge applied to green space construction of a sponge city. The device comprises a Mariotte flask (3), a percolation column (9) and a latex air bag (16), wherein the percolation column (9) is internally provided with a perforated partition plate (10) used for placing a sponge to be measured; the top of the percolation column is opened and is provided with a sealing plug (8) connected with the Mariotte flask (3) and the latex air bag (16); and the bottom of the percolation column connected with a measuring cylinder (13) through a liquid outlet tube (12). The sponge to be measured is placed on the perforated partition plate (10) in the percolation column (9); the percolation column (9) is filled with air through the latex air bag (16) and is then filled with water; after the surface of the water is higher than the surface of the sponge to be measured, the percolation column (9) is connected with the Mariotte flask (3), and the air inlet hole of the Mariotte bottle (3) is aligned with the water surface in the percolation column (9); and then the infiltration rate is calculated according to the measurement parameters. Compared with the prior art, the device of the invention has the advantages of simplicity, low cost, easy operation and the like.

The invention discloses a constant flow injection pump system and a cell magnetic sorting device. The constant flow injection pump system comprises a first plunger pump, a second plunger pump, a first check valve, a second check valve, a third check valve, a fourth check valve, a liquid outlet pipe and a liquid inlet pipe; the outlet of the first plunger pump is respectively connected with the inlet of the first check valve and the outlet of the second check value; the outlet of the first check value is connected with the liquid outlet pipe; the liquid inlet pipe is respectively connected with the inlet of the second check valve and the inlet of the third check valve; the outlet of the second plunger pump is respectively connected with the outlet of the third check valve and the inlet of the fourth check valve; the outlet of the fourth check valve is connected with the liquid outlet pipe. According to the constant flow injection pump system, liquid can be kept stable and constant in flow rate, and the flow rate can be regulated; the cell magnetic sorting device is simple in structure, efficient and reliable, and is suitable for continuous high-capacity magnetic cell separation; the device integrates a target cell washing function, therefore sorting and washing are completed simultaneously, and high-quality continuous cell sorting can be realized.

A fuel injector comprising an injector body having a spray aperture; a pintle extending within the injector body for axial movement between a closed position and an open position; said pintle head comprising a tapered portion engageable against the valve seat of the spray aperture and a cylindrical portion upstream of said tapered portion, an annular channel being provided defining a first part of a flow passage upstream of the spray aperture, wherein a discontinuity is provided downstream of the annular channel and upstream of the spray aperture to generate cavitation when the pintle stroke exceeds a predetermined limit to thereby generate a virtual channel of constant cross section downstream of the annular channel whereby the flow rate of the fuel flowing through said spray aperture is substantially independent of the stroke of the pintle when the pintle is in its open position.

The invention discloses a drip irrigation device used for integration of water and fertilizer. The drip irrigation device comprises a drip irrigation pipe and a sealing cover body, wherein a D-shapeddrip irrigation channel is formed in the drip irrigation pipe; a constant-pressure groove, a tooth-shaped flow limiting groove, a drip irrigation groove and a siphon compensation groove are further formed in the drip irrigation pipe; a water flow channel is formed in one side of a pressure balance partition plate; a through hole is formed in a water flow channel plate; a pair of extrusion springsare fixedly installed at the end, away from the drip irrigation groove, of the siphon compensation groove; a siphon balance hole communicates with a siphon balance ball arranged in the D-shaped drip irrigation channel, and clean water is poured into the siphon balance ball; and a first-level sleeve is inserted in a sealing sleeve in a movably mode. A flexible pressure film expands under the actionof pressure to be matched with the tooth-shaped flow limiting groove, so that the flow speed of the drip irrigation hole is guarantee; meanwhile, during irrigation, the drip irrigation groove is opened, during irrigation stopping, the drip irrigation groove is closed, and the siphon volume is compensated through volume expansion of the siphon balance ball; and the blocking phenomenon caused by backflow of liquid in a burette is effectively prevented.

An infusion pump includes an actuator having an output shaft; a pump actuator comprising a plurality of members (30a, 30b, 30c, 30d) in hinged communication with each other so as to form a parallelogram construction, the plurality of members being hinged to the output shaft, and having a length 1 actuator moved by the output shaft and in contact with tubing, such that the pump actuator at an output shaft actuated distance x creates flat contact areas with the tubing, and wherein remaining non-contact areas of the tubing are at least substantially circular in shape; and a logic implementer configured to use at least two relationships to solve for a same number of variables to calculate a cross-sectional area of the tubing at an output shaft actuated distance x.

The invention discloses a hydrogen fuel cell metal bipolar plate resistant to long-term corrosion, which comprises a metal bipolar plate with plating layers on the surface, and the plating layers are a Cr plating layer, a CrN plating layer and a CrTiCN plating layer in sequence from inside to outside on the surface of the metal bipolar plate. The corrosion-resistant coating still has excellent corrosion resistance under a long-term corrosion condition, and meanwhile, the contact resistance of the corroded coating is kept in a low state.

The invention belongs to the field of medical instruments and particularly relates to a proportional valve for non-invasion ventilators. The proportional valve comprises a valve body, a head cover, a valve spool and a motor. The head cover is disposed at the bottom of the valve body, and the valve spool and the motor are accommodated inside the valve body. Guide channels are arranged on the valve spool along the circumferential direction, two ends of each guide channel are the closed, and a position sensor is arranged on the side wall of the cavity of the valve spool; an air inlet valve hole, an air outlet valve hole and an exhaust valve hole respectively communicated with the corresponding guide channels are arranged in the valve body, a detector is arranged at the position of the outlet of the air outlet valve hole, and the position sensor and the detector are respectively electrically connected with an intelligent control circuit; the valve spool is driven to rotate through the motor, and conversion of the proportional valve under the states of complete air outlet, complete exhaustion and half opening and half closing can be realized by connecting or disconnecting the guide channels with the air inlet valve hole in the valve spool. The proportional valve is simple and reasonable in structure and small in size; size of pressure or flow velocity tidal volume can be controlled in real time, noises during operation can be reduced, and pressure titration or the tidal volume can be accurately controlled and provided for a patient.

The invention discloses feeding equipment for producing polyethylene fibers. The feeding equipment comprises a feeding kettle. A polyethylene powder and solvent mixed liquid input pipeline is connected to the top of the feeding kettle, a polyethylene powder and solvent mixed liquid output pipeline is connected to the bottom of the feeding kettle, and a polyethylene powder and solvent mixed liquid circulating pipeline is further connected to the feeding kettle. The inlet end of the polyethylene powder and solvent mixed liquid circulating pipeline is communicated with the bottom of the feeding kettle, the outlet end of the polyethylene powder and solvent mixed liquid circulating pipeline is communicated with the top of the feeding kettle, and a circulating pump is arranged on the polyethylene powder and solvent mixed liquid circulating pipeline. Compared with an ultrahigh molecular weight polyethylene fiber feeding device used at present, due to the fact that the material circulating pump is added, material accumulation on the bottom in a cavity of a kettle body is avoided, and shearing stress is reduced.

The invention discloses a conveying device capable of passively adjusting flow. The conveying device comprises a pipeline, a transmission mechanism and a flow adjusting assembly; an annular opening isformed in the inner wall of the pipeline; the transmission mechanism comprises an annular driving cavity, a driven cavity and a connecting channel communicating the annular driving cavity and the driven cavity, the annular driving cavity, the driven cavity and the connecting channel are filled with a flowing medium, the inner side wall of the annular driving cavity includes an extrusion deformation piece, and an annular opening is sealed; the flow adjusting assembly comprises a moving part and a plugging barrel, the plugging barrel is plugged at the position, located in the downstream of theextrusion deformation piece, in the pipeline, a plurality of circulating holes are formed in the plugging barrel, and the moving part is movably connected to the plugging barrel; and an elastic telescopic part is arranged on the driven cavity, and the extrusion deformation piece drives, through the extruded stroke, the moving piece to shield the circulation hole. According to the conveying device,adjustment of pulse liquid flow or air flow is passively achieved through the transmission mechanism, and the relatively-constant flow speed and flow are obtained.