248results about How to "Improve metering accuracy" patented technology

The invention discloses an SCP urea injection system for the post treatment of diesel engine emissions, which belongs to internal combustion engine waste gas purification systems, comprises a urea solution box, a conveying pump, a filter, a urea nozzle, a pressure sensor and a temperature sensor, and is characterized in that the urea injection system comprises an energy accumulator, a large-capacity injection accommodating cavity and a device for heating urea solution by diesel exhaust, wherein the energy accumulator is connected with a main pipeline of the system in parallel and is used for stabilizing the pressure of the main pipeline; the large-capacity injection accommodating cavity is directly connected with the urea nozzle; and the device for heating the urea solution by the diesel exhaust comprises a waste gas inlet pipe, a temperature control valve, a waste gas outlet pipe and the like, wherein the urea nozzle adopts a pintle type nozzle which can prevent the urea from being crystallized at a low temperature to block an injection orifice. The system can realize precise and reliable injection metering of the urea solution.

The utility model discloses an electronic mass flow gas meter; an airtight cavity is arranged in the casing of the gas meter. The gas pipelines in the casing are divided into an independent gas inlet pipe, and a flow testing tube and gas outlet pipe, which are connected together. The gas inlet and outlet pipes are respectively connected with the gas outlet and inlet interfaces of the casing. The lower end of the flow testing tube is connected with the gas outlet pipe and horizontally suspended inside the casing. A main flow airway and a bypass airway are arranged in the flow testing tube; wherein, a by-passing device is arranged in the main flow airway and arranged between the two through holes for communicating the bypass airways. The cross-sectional area of the bypass airway is smaller than that of the main flow airway, and a signal sensing module of thermal mass flow sensors is arranged on the inner wall of the bypass airway for detection. The utility model can carry out mass flow measurement of the passing gas, and can prevent the dust in the gas from attaching to the sensing element, thus improving the measuring accuracy and service life of the gas meters.

The invention provides a gas flowmeter. The gas flowmeter comprises a flow guide filter element and a laminar flow generator, wherein the flow guide filter element and the laminar flow generator are sequentially arranged inside a tubular shell in the direction of a gas flow, and a differential pressure transducer and a data processing unit are arranged outside the tubular shell; the side wall of the tubular shell is provided with two pressure taking channels in the radial direction, the two pressure taking channels correspond to two sensing ends of the differential pressure transducer, and the two pressure taking channels are located in front of and behind the laminar flow generator; the main body of the laminar flow generator is multi-micropore channels, the section of each multi-micropore channel is in a grid shape, all the multi-micropore channels are parallel to one another and mutually insulated, so that the gas flow to be measured passes through the laminar flow generator in a laminar flow state. The gas flowmeter has the advantages of being small in size, stable in work and high in metering accuracy.

The invention discloses an oil-water interface measuring device of a crude oil storage tank and a measuring method thereof. The oil-water interface measuring device comprises a main control computer, an RS485 (Recommended Standard 485) communication network and field measurement and control devices, wherein the main control computer is connected onto the RS485 communication network which is connected with the plurality of field measurement and control devices by RS485 communication interfaces; and each field measurement and control device comprises a data communication and signal processing unit, a single chip microcomputer, a data acquisition unit, an output driving module of the single chip microcomputer, a measuring array probe sheathed cleaning unit, a space height detection unit and a matrix type multi-phase interface tomoscan unit. The invention integrates the advanced sensor technology, data acquisition, modern communication and the computer control technology so as to realize comprehensive automation of measurement of the storage tank, greatly improves the accuracy of measurement, liberates workers from heavy work, leads workers to be capable of browsing and inquiring measured data and curves on the internet, and can improve modernization and informationization level of control and management of the production process of oil production plants in an oil field.

A method and system for metering the real-time displacement volume of a piston-type concrete pump is disclosed. Said method includes such steps as measuring the piston displace of concrete cylinder and the pressure of concrete cylinder, analyzing the measured piston displace signal as reference and the pressure signal, calculating the real-time pumping coefficient, finding out the modification to calculated result according to the information contained in the pressure signal of hydraulic system, and metering the real-time displacement of concrete pump.

The invention relates to a urea injection system by adopting a gas pressure source. The system is characterized by comprising a urea jar, a filter, a urea nozzle, a pressure sensor, a temperature sensor and an electric control unit, wherein the system comprises a gas pressure source and a pressure regulating stabilizer which are connected with the main pipeline of the system; the urea solution for injection is pressurized by utilizing the stable gas pressure; and an electric urea pump is not arranged in the system. The system provided by the invention has the advantages of simple structure, stable pressure and high injection metering accuracy.

The invention discloses a method anddevice for acquiring tobacco liquid consumption information, and belongs to the technical field of simulated smoking. The method includes the steps of acquiring a current detected value of a predetermined working parameter; determining the tobacco liquid consumption information according to the current detected value, wherein the tobacco liquid consumption information includesat least one ofan amount of tobacco liquid consumed in a smoke bomband the amount of the tobacco liquid consumed in an electronic cigarette within a unit time period, the predeterminedworking parameter is a working voltage of an atomizing assembly when the electronic cigarette is not in a charging state, and the predetermined working parameter is a charging voltage of the electronic cigarettewhen the electronic cigarette is in the charging state; the method solves the problem in the prior art that there is a large error when the amount of the tobacco liquid in a liquid storagepart is calculated if the electronic cigarette is not in the erect state, and achieves the effect of increasing the measurement accuracy of the amount of the tobacco liquid in the liquid storage part.

An embodiment of the invention discloses an electric energy metering simulation method, a device and a system; the embodiment of the invention performs transformation and process in a dSPACE (data space) system embedded with an MATLAB (matrix laboratory) platform, and compiles a measurement algorithm according to the power theory to form a measurement algorithm model library; the measurement accuracy of electric energy meters with different principles and algorithms can be simulated and analyzed; the limitations caused by the influences of standard meters with different principles to verification results in prior art are overcome; and the voltage and current parameters of the collected actual load and / or virtual load use the parameters of the dSPACE system for calculating and processing, and use the algorithm of the MATALAB platform for calling a software extended function; the collection and process of the actual load parameters and the algorithm optimization of non-sine reactive measurement are realized; and the measurement accuracy of the electric energy meter under actual application environments is improved.

The invention belongs to the technical field of online quantitative weighing and an automatic control system thereof, and in particular relates to a variable speed feeding quantitative weighing system based on a buoyant weighing and sensing principle. A mechanical system of the variable speed feeding quantitative weighing system consists of a feeding mechanism, a feeding machine, a weighing cylinder mechanism, a leverage which transfers a quantitative weighing force value during the weighing, a discharging mechanism, a discharging cylinder, a dowel bar, a buoyant weighing sensor and weights which can adjust the quantitative weighing value; and a programmable logical control (PLC) measurement and control system of the variable speed feeding quantitative weighing system consists of a chord length (L) / instantaneous velocity (V) variation and voltage amplification module, a filter module, an analog (A) / digital (D) conversion module, a PLC central processing module, a display module, a relay part, a feeding mechanism and an electromagnet control device. The basic principle of the system is that after the buoyant weighing sensor compares the measured weighing value with a preset weighing value range, when the output electrical signal value reaches the preset signal value, the PLC measurement and control system can be used for accelerating and slowing down the feeding machine, and thus, the dual purposes of increasing the production efficiency and improving the weighing accuracy are realized.

A method and system for measuring the real-time displacement volume of a piston-type concrete pump is disclosed. Said method includes such steps as measuring the piston displace of concrete cylinder and the pressure of concrete cylinder, analyzing the measured piston displace signal as reference and the pressure signal, calculating the real-time pumping coefficient, finding out the modification to calculated result according to the information contained in the pressure signal of hydraulic system, and metering the real-time displacement of concrete pump.

The invention provides a voltage negative phase sequence detection method and system for manganese-copper three-phase four-wire and three-phase three-wire electric energy meters. The method for the three-phase four-wire electric energy meter comprises the steps that a microprocessor transmits a broadcast command for calculating the phase voltage zero crossing time to a first phase metering unit, a second phase metering unit and a third phase metering unit in the electric energy meter. The microprocessor reads the first phase voltage zero crossing time T1 calculated by the first phase metering unit, the second phase voltage zero crossing time T2 calculated by the second phase metering unit and the third phase voltage zero crossing time T3 calculated by the third phase metering unit, and judges whether T1, T2 and T3 meet the following relations: T1<T2<T3, or T2<T3<T1 or T3<T1<T2 or not: determining the negative phase sequence of the electric energy meter if the T1, T2 and T3 do not meet the following relations: T1<T2<T3, or T2<T3<T1 or T3<T1<T2. The method can timely find a wiring error in an installation process, prevents a lawbreaker from enabling the electric energy meter to record electric consumption less to steal electricity through employing negative phase sequence, and improves the metering accuracy and reliability of the three-phase electric energy meter.

Disclosed is a harmonic wave electric energy measuring system based on parameter analysis and a control method of the harmonic wave electric energy measuring system based on the parameter analysis. The system comprises a three-phase power grid data collecting module, a data processing module, a data managing module and a periphery module, wherein the three-phase power grid data collecting module is connected with the data processing module through a parallel interface. The data processing module is connected with the data managing module through an asynchronous serial, and the data managing module is directly connected with the periphery module. The harmonic wave electric energy measuring system based on the parameter analysis and the control method of the harmonic wave electric energy measuring system based on the parameter analysis can meet the harmonic wave electric energy measuring requirement, achieve better calculation accuracy than A standard request of GB / T-14549-93, and make up for the defect that a traditional electric energy measuring system can not achieve accurate calculation of the harmonic wave electric energy.

The invention discloses a standard device using a mass method for detecting high-pressure gas filling flow. The device comprises multiple high-pressure gas cylinder sets, an electronic balance and a lifting device. All the high-pressure gas cylinder sets are connected together through gas pipes, the lifting device is used for ascending or descending the high-pressure gas cylinder sets integrally, and gas cylinder valves, precision pressure gauges and flow indicating instruments are further arranged on the gas pipes. The lifting device comprises a loading trolley, multiple hydraulic oil cylinders arranged at the bottom of the loading trolley, needle valves which can adjust the hydraulic oil amount, a three-way directional control valve and an oil pump. The standard device judges whether a detected object meets standard requirements or not through comparing the mass difference of weighing the high-pressure gas cylinder sets via the electronic balance with the indicating value of the detected object, the flow range is wider, metering accuracy is higher, and measurement repeatability is better. The standard device can be respectively connected with a CNG dispenser, a CNG dispenser calibrating device and a high-pressure gas flow meter for measurement detection.

The invention discloses an on-spot detecting method and a device of a family in-use gas meter. In the method, a meter front manometer, a thermograph, a standard gas meter and a meter back manometer are connected in series between a user gas meter and a cooker; a meter front valve and a meter back valve are opened and a stove front valve is closed for safety detection; after the safety detection, the stove front stove is opened, the stove is ignited, a small fire combustion mouth is ignited, a flow adjusting device is adjusted to a smallest flame for detecting the basic small flow error, then the small fire combustion mouth and a middle fire combustion mouth are ignited, the flow adjusting device is adjusted to a middle flame for detecting the basic middle flow error, and simultaneously the small fire combustion mouth, the middle fire combustion mouth and a large fire combustion are ignited, the flow adjusting device is adjusted to a large flame for detecting the basic large flow error, and an air through flow is over 50 liter in every detection. The device and the method can in-site detect the safety and the basic error of the family gas meter under in-use environment. The device and the method have the advantages of quick speed, short time, low cost, easy operation, safety and accuracy.

The invention discloses an integrated wellhead continuous dosing device which comprises a power end and an overflowing end in mutual connection with each other, wherein the power end comprises a cylinder and a plunger; the cylinder is vertically arranged; the plunger is inserted into a chamber of the cylinder; an extending end of the plunger is connected with a power source; a compression spring for resetting the plunger is arranged between the chamber and the plunger; the overflowing end comprises a channel which is respectively in annular communication with the chamber, a drug kit and a wellhead. Compared with the prior art, the integrated wellhead continuous dosing device has the advantages of simple structure, stability and reliability in work, high adaptive capacity to environment, accurate dosage and convenience in maintenance and repairing.

The invention provides a high precision dynamic weighing method and a high precision dynamic weighing instrument and aims to overcome the problems of low weighing accuracy, axle loss and data loss existing in axle load truck scale of present road toll by weight. The four corners of a scale body adjust the gap between the scale body and a frame through a horizontal limit screw and a longitudinal limit screw to cause the movement of the scale body in horizontal direction to be limited within a certain range and keep vertical stress. Besides, the scale body is 3.6-4.2m long and 3.0-4.0m wide. The weighing method is realized as follows: weighing transducers are fixed at the four corners of the scale body, a data processor weighs the four corners of the scale body in real time, the instantaneous weight, instantaneous axle number (the axle number on the scale body) and the weight of each axle are analyzed and calculated in real time, and the principle of moments and mechanical method are applied to calculate the position and numbers of the axle and accurately judge the axle number and weight and the total weight.

The invention discloses an ultrasonic gas metering device with a self-learning template and a metering method of the device. The ultrasonic gas metering device comprises a central core processing module, an analog signal timing module, a signal processing module, a digital sampling module, a metering algorithm processing module, a template waveform learning module and a display module, wherein the central core processing module is in signal connection with each of the analog signal timing module, the signal processing module and the metering algorithm processing module; the analog signal timing module is in signal connection with the signal processing module; the sampling signal input end of the digital sampling module is connected with the signal processing module; the digital sampling module is in signal connection with the metering algorithm processing module; the metering algorithm processing module is in signal connection with the template waveform learning module; the signal input end of the display module is connected with the central core processing module; the signal processing module is used for collecting signals of a transducer. Through self-adaptive learning of template waveforms, an appropriate waveform template can be efficiently selected without being influenced by individual difference of the transducer, and the template can be more stable and reliable.

The invention discloses a granular preparation porous metering device. The granular preparation porous metering device comprises a connecting cover with one end in threaded connection to a medicine bottle and the other end connected with a positioning medicine separation disc; the positioning medicine separation disc is coaxially connected with a metering disc; the metering disc is coaxially connected with a bottom cover; the positioning medicine separation disc is relatively fixed with the bottom cover; the metering disc is slidingly in contact with the positioning medicine separation disc and the bottom cover; and granular preparations are metered for falling by hole structures on the positioning medicine separation disc, the metering disc and the bottom cover in sequence in the peripheral rotating process of the metering disc. Through cooperation of the hole structures on the positioning medicine separation disc, the metering disc and the bottom cover, the granular preparations areaccumulated on the positioning medicine separation disc; in the circumference rotating process of the metering disc, the granular preparations firstly fall into the hole structure of the metering discby the positioning medicine separation disc, and then, fall onto the bottom cover to realize discharging into packing containers; and the metering accuracy is only related to the hole structure on the metering disc, so that the metering accuracy is higher.

The invention relates to a peristaltic pump (1), comprising a saddle and a rotor (3) that can be rotated therein, between which a hose (4) is arranged. The rotor (3) bears hose-squeezing means (6), which slide over the hose (4) with the rotation of the rotor (3) and thus pump a pumping fluid. Pulsation effects occur when the hose-squeezing means (6) emerge from the hose (4). According to the invention, said pulsation effects are suppressed by suitably shaping an inner saddle surface (5) on which the hose (4) rests. In addition, the pulsation effects can be reduced or avoided by adjusting the rotational speed of the rotor in a controlled manner, suitably selecting a pumping end position for the metering of the pumping medium, or defining certain unchanging pumping end positions. The invention further relates to the use of such a peristaltic pump (1) for metering.

The invention relates to a selective catalyst reduction (SCR) urea tank for after-treatment of exhaust gas of a diesel engine, belonging to a purification system of exhaust gas of an internal combustion engine. The invention is characterized in that the urea tank is a pressure container tank, the bearing pressure is 1.0MPa, the upper end of a urea tube in the tank body is fixed on a urea outlet valve and is communicated with a urea outlet tube, a temperature sensor, a liquid level sensor, a heating tube and a pressure sensor are also installed on a valve seat, and a drain opening is installed at the bottom of the urea tank. The SCR urea tank provides a urea solution with stable pressure for a pneumatic SCR urea jet system, obviously improves the metering accuracy and stability of the jet amount of the urea solution, and has the advantages of simple structure, low cost and good practical value.

A method for correcting line-direction dragging of an image observed by a lunar-based astronomical telescope comprises the steps of 1, acquiring a dark field image and processing the dark field image to obtain a super dark field image with cosmic ray interference eliminated; 2, extracting line-direction dragging events from the super dark field image; 3, conducting model fitting analysis on all the dragging events extracted in the step 2, so that model parameters are obtained; 4, conducting background subtraction on a primal space observation CCD image, and correcting the image obtained after background subtraction row by row by means of the model parameters obtained in the step 3, so that correction of line-direction dragging of the image observed by the lunar-based astronomical telescope is achieved.

The invention provides a gas meter valve cover and valve seat sealing performance detection device, and belongs to the field of gas meter detection auxiliary equipment. The device comprises a fixed apparatus for installing a valve seat, an air exhaust apparatus, a detection apparatus, a negative pressure pump and a drive apparatus, wherein the output shaft of the drive apparatus is used for driving and connecting a valve cover, and driving the valve cover to rotate relative to the valve seat. A sealed region is formed among the valve seat, the valve cover and the fixed apparatus, and the sealed region is communicated with an air inlet of the air exhaust apparatus. The outlet of the air exhaust apparatus is connected with the detection apparatus, and the detection apparatus is connected with the negative pressure pump. The detection apparatus judges the sealing performances of the valve seat and the valve cover according to the leakage amount of gas in a rotating process of the valve cover. The device is simple and reasonable in structure, is convenient to manufacture and machine, is convenient to operate, and can achieve the accurate dynamic detection of a leaked flow of the valve seat and the valve cover. The obtained sealing result accords with the application standard of a gas meter in a better way.

The invention relates to an electric energy quality monitoring and electric energy metering device that can be mounted and dismounted in an electrified manner at a high-tension side, and belongs to the technical field of electric energy quality on-line monitoring and electric energy metering. The device includes three current and voltage acquisition units, a CPU module, a low-tension side voltage energy-supplying power supply module, and a wireless communication module. Each current acquisition unit is connected to the CPU module and the low-tension side voltage energy-supplying power supply module. The low-tension side voltage energy-supplying power supply module and the communication module are connected to the CPU module. The device can be mounted without power being cut or lines being cut, is suitable for indoor and outdoor environments, has electric energy quality monitoring and electric energy metering functions, and has the characteristics of wide measurement range, wide response frequency band width and high accuracy within a wide operational temperature range.

The invention discloses a direct-current electric energy meter and a method for metering direct-current electric energy. The meter at least comprises a detection module, a processing module, a storage module and an interaction module, wherein the detection module is used for sampling voltage and current, acquiring a voltage signal and a current signal, converting the voltage signal and the current signal into a detection signal and transmitting the detection signal to the processing module; the processing module is used for calculating an electric energy parameter according to the detection signal and storing the electric energy parameter in the storage module; the storage module is used for storing the calculated electric energy parameter; and the interaction module is connected with the processing module and is used for acquiring and displaying the calculated electric energy parameter. Compared with a conventional direct-current electric energy meter which has a mechanical electromagnetic structure, the brand new direct-current electric energy meter adopting full-electronic apparatuses has high metering degree of accuracy, longer service life and anti-external disturbance capacity.

The invention discloses a device and a method for measuring output liquid of a coal bed methane well. The device comprises a buffer vessel, a fluid flowmeter and a connecting pipe, wherein the buffer vessel is provided with an inlet and an output of output liquid, the top of the buffer vessel is provided with a gas outlet, and the bottom of the buffer vessel is provided with a solid phase outlet; the fluid flowmeter and the connecting pipe constitute a U-shaped pipeline, and the fluid flowmeter is at the bottom of the U-shaped pipeline; and two ends of an exhaust pipe are respectively connected with the gas outlet of the buffer vessel and the liquid outlet of the U-shaped pipeline. The method is as follows: after the output liquid of the coal bed methane well is separated by the buffer vessel, the output liquid passes through the flowmeter to be measured. The method enables the liquid to be separated from solid phase coal dust and gas prior to passing through the flowmeter, and only the liquid passes through the fluid flowmeter. Therefore, the measuring accuracy is improved. When the output liquid is small in amount, the physical principle of the U-shaped pipeline is used for improving the measuring accuracy. The measuring method is high in accuracy, can be used for metering the output liquid of the coal bed methane well, the output oil or water in an oil gas well or other similar working conditions.

A method for controlling fuel injection timing of at least one fuel injector in a direct injection fuel delivery system of an internal combustion engine during a mode of engine operation where a plurality of fuel injection events are performed by the at least one fuel injector during a cylinder event is provide. The method includes, during a first fuel injector needle bounce condition following the end of injection of a first fuel injection event, sending a start of injection signal for a second fuel injection event at a first time, and during a second fuel injector needle bounce condition following the end of injection of the first fuel injection that differs from the first fuel injector needle bounce condition, sending the start of injection signal for the second fuel injection event at a second time that is earlier than the first time.

The invention relates to the technical field of oil well metering devices and methods, in particular to an integral automatic well selection metering device and a multi-process automatic oil well output metering method. The integral automatic well selection metering device comprises a multi-way valve, a vertical gas and liquid separator, a liquid drain pump and an RTU (remote terminal unit), wherein a single well metering liquid outlet pipeline, a multi-way valve liquid outlet pipe and at least one single well oil collecting pipeline are fixedly arranged on the multi-way valve; the other end of the single well metering liquid outlet pipeline is communicated with a material inlet of the vertical gas and liquid separator; a liquid level meter is arranged on the vertical gas and liquid separator and is used for monitoring the liquid level in the vertical gas and liquid separator. The integral automatic well selection metering device has the advantages that the structure is reasonable and compact; by combining capacity type metering and mass flow meter metering, the single well liquid metering range is wider, the indirect type metering is realized, the instantaneous type metering is also realized, and the metering accuracy is higher; by adopting an integrated prying device, the construction and installation at site are convenient and rapid, the construction workload is decreased, and the construction cycle is effectively shortened.