37results about How to "Expand the scope of measurement" patented technology

The invention belongs to the fluid measurement technology field and relates to a multiphase flow measurement method based on a double-section impedance type long waist cone sensor. The adopted sensor comprises a cone throttling element, a systolic blood pressure drop differential pressure transmitter, a permanent pressure loss differential pressure transmitter and an electrical sensitive sensor. The method comprises the following steps: collecting two pairs of differential pressure signals generated by the cone throttling element; utilizing the electrical sensitive sensor to collect an electrical signal; calculating the total mass flow rate, the each-phase mass flow rate and the each-phase mass content according to a double-differential pressure model of a single throttling element; utilizing a support vector machine to realize classify, identify and pre-judge a flow pattern according to the measurement data of the differential pressure signals and the electrical signal; adopting a capacitance model to measure a mixed fluid dielectric constant; adopting a conductivity model to measure the mixed fluid conductivity; and calculating the procedure parameter of oil-gas-water three-phase flow. The multiphase flow measurement method is not influenced by the fact that whether a multiphase flow continuous phase is conducted or not, has the characteristics of high measurement precision,high reliability and the like and can obtain more measurement information.

The invention, which belongs to the technical field of optical machine assembling adjustment, discloses a device and method for centering mounting adjustment of a large-calibre aspheric-surface reflector. The method is characterized in that a to-be-adjusted aspheric-surface reflector is fixed at a rotary adjusting mechanism of a centering device; deviation between an optical axis of the aspheric-surface reflector and a reference axis is measured in real time by using an eccentricity measuring system in the device and the position and direction of the deviation are displayed at a display device; and the position attitude of the aspheric-surface reflector is adjusted, so that the overlapping error between the reflector optical axis and the reference axis is smaller than a designed allowance value and thus centering assembling adjustment of the aspheric-surface reflector is completed. With the device and method, a centering problem of a large-calibre rotary symmetric aspheric-surface reflector can be solved. The device and method have characteristics of simple instrument erecting, great convenience in operation, and high centering precision and the like.

The invention relates to a sliding lever-type metering and control device for irrigation water quantity. The sliding lever-type metering and control device comprises a water passing tank, a gate on-off device, electromagnetic locks, a travel switch and a controller. The water passing tank is installed in a ditch revetment, two sides of which are provided with a water inlet gate and a water outlet gate. The gate on-off device comprises a sliding lever, a lever support, a balancing weight, a water leakage tank, a buoyancy drum and a support rod. The middle portion of the sliding lever is provided with a U-shaped groove and one side of the sliding lever is provided with the balancing weight. The sliding lever is fixed onto the lever support by means of a rotary shaft. Two ends of the lever are connected with two gates by means of a steel wire rope. The electromagnetic locks and the travel switch are fixed at the top of the water flowing tank. The controller is fixed at the top of the water passing tank and connected with the travel switch and the electromagnetic locks. The controller receives a triggering signal of the travel switch and is capable of controlling on-off of the electromagnetic locks.The sliding lever-type metering and control device for irrigation water quantity has following advantages: the sliding lever-type metering and control device is simple in structure and accurate in metering and used for metering and automatic control of the irrigation water capacity of a single piece of farmland in favor of improvement on utilization efficiency of water resources and automated control over irrigation water quantity.

The invention belongs to the technical field of fluid measurement, and relates to multi-phase flow measuring methods based on a single-section impedance long-waist internal cone sensor. The adopted sensor comprises a cone throttling piece, a systolic pressure drop differential pressure transmitter, a permanent pressure loss differential transmitter and an electrical sensitive sensor. According tothe difference of properties of continuous phases, the invention provides two measuring methods which have the same inventive concept and respectively comprise the following steps of: collecting two pairs of differential signals generated by the cone throttling piece; collecting electrical signals by utilizing the electrical sensitive sensor; calculating the total mass flow rate, the mass flow rate of each phase and the mass content of each phase according to a double-differential model of a single throttling piece; selecting a corresponding electrical method according to whether the continuous phases are conductive, and calculating the section content of each phase; and selecting a corresponding calculating model, and calculating the procedure parameters of an oil phase, a gas phase and an aqueous phase. The multi-phase flow measuring method is characterized by high measuring precision, high reliability, capability of obtaining more measurement information, low cost and the like, andcan be widely applied in the industries of petroleum, chemical engineering, energy power, metallurgy and the like.

The invention belongs to the technical field of fluid measurement, and relates to a multi-section impedance long-waist internal cone sensor which comprises a cone throttling piece, a systolic pressure drop differential pressure transmitter, a permanent pressure loss differential transmitter and an electrical sensitive sensor, wherein the cone throttling piece is a long-waist internal cone throttling device which comprises a front-section cone body, a middle-section columnar body used as the waist part of the cone body and a rear-section cone body which are coaxially fixed at the center of a pipe through a support; an annular circulating space is formed by the three parts of the cone throttling piece and the wall of the pipe; and the electrical sensitive sensor comprises four groups of electrodes distributed on different sections in the annular circulating space, wherein two groups of similar electrodes are used for measuring the electrical conductivity of a mixed fluid, and the other two groups of similar electrodes are used for measuring the dielectric constant. The invention also provides a multi-phase flow measurer which adopts the multi-section impedance long-waist internal cone sensor and is used for measuring the multi-phase flow procedure parameters of a continuous phase within the range from a conductive phase to a non-conductive phase. The multi-section impedance long-waist internal cone sensor and the multi-phase flow measurer have the characteristics of high measuring precision, high reliability, capability of obtaining the measuring information and the like.

The invention belongs to the technical field of flow measurement, relating to a single-cross section impedance type long-waist inner cone sensor which comprises a cone throttling element, a systolic pressure drop differential pressure transmitter, a permanent pressure loss differential pressure transmitter and an electrical sensitivity sensor; as the long-waist inner cone throttling element, the cone throttling element is composed of a front-section cone, a middle-section cylinder as the waist of the cone and a back-section cone, is coaxially fixed at the center of a pipeline by a support and forms an annular circulating space with the pipe wall of the pipeline; the electrical sensitivity sensor comprises a group of electrodes which are distributed in the annular circulating space and are positioned at the same cross section of the pipeline; the group of electrodes are composed of an inner electrode and an outer electrode; the inner electrode is the cone throttling element or is fixed on the surface of the waist of the cone; and the outer electrode is fixed on the inner wall of the pipeline. The invention simultaneously provides a single-cross section impedance type long-waist inner cone multiphase flow measuring device adopting the sensor. The sensor and the measuring device have the characteristics of high precision, high reliability, low cost and the like.

The invention discloses a gaugeable star-shaped valve which comprises a discharge valve shell, a feed pipe positioned at the upper part of the shell, a discharge pipe positioned at the lower part of the shell, an impeller positioned in the shell and a rotary shaft used for driving the impeller; at least three blades are arranged on the impeller; the blades separate the impeller into boxes with equal size and same quantity with the blades; the size of an opening of each box is equal to or larger than that of an inlet of the discharge pipe; permanent magnets which are uniformly distributed along the periphery of the rotary shaft has the same quantity with the blades and corresponds to the positions of the blades; and reed pipes matching with the permanent magnet are arranged at the side of the rotary shaft. The gaugeable star-shaped valve provided by the invention controls a stepping motor through a controller and counts through the reed pipes to figure out volume or weight of a material passing through the star-shaped valve. According to the gaugeable star-shaped valve, each box has equal size, so that measurement to a box can be realized precisely; the boxes can be increased or decreased, or the size of the boxes can be adjusted as required so as to realize different flows and measurement units; and therefore, the gaugeable star-shaped valve has stronger adaptability.

The invention discloses a crude-oil automatic continuous measuring device, comprising a separator, an electric T-shaped valve, a remote level gauge, a safety valve, a pressure sensor, a temperature sensor, a control circuit and an intelligent control cabinet. The invention is characterized in that the separator body is shaped like a vertical cylinder, the upper and lower ends of the separator body are welded with seal heads, and a separating plate is welded vertically from the middle part of the lower seal head to the lower end of the lower seal head to divide the separator body symmetrically to form two separating cavities; the situation of fluid collecting and fluid discharging is detected by the remote level gauge, the pressure sensor, and the temperature sensor, through controlling by the control circuit in the control cabinet, through filling nitrogen into the separator body, the continuous or discontinuous measuring for crude oil in oil well with high / low oil gas ratio is realized.

The invention discloses a method and system for measuring extremely-low-frequency vibration through low-frequency vibration sensors, terminal equipment and a readable storage medium. The method comprises the following steps: actually measuring the amplitude-frequency characteristic and the phase-frequency characteristic of each extremely-low-frequency vibration sensor in an extremely-low frequencyband (such as 0.35-6 Hz) ; actually measuring and obtaining a time domain oscillogram of extremely-low-frequency vibration by using the low-frequency vibration sensors; carrying out spectral analysison the time domain oscillogram in the specified time period to obtain a spectral characteristic value of the time domain oscillogram; correcting the frequency spectrum characteristic value of the actually measured extremely-low-frequency vibration by using the frequency response characteristic of the extremely-low-frequency band of the sensor; and generating a group of fundamental frequency and frequency doubling sine waves by using the corrected frequency spectrum characteristic values, and superposing the fundamental frequency and frequency doubling sine waves on phases to obtain a corrected extremely-low-frequency vibration time domain oscillogram, thereby realizing accurate measurement, analysis, calculation and storage of extremely-low-frequency vibration. According to the invention,the technical problems of large error, untrusted data and the like during measurement of extremely-low-frequency vibration in the prior art are solved, and the reliability and accuracy of measurementof extremely-low-frequency vibration are improved.

The invention discloses a method, system, terminal equipment and readable storage medium for measuring extremely low-frequency vibration by a low-frequency vibration sensor. characteristics and phase-frequency characteristics; use the low-frequency vibration sensor to measure and obtain the time-domain waveform diagram of extremely low-frequency vibration; perform spectrum analysis on the time-domain waveform diagram of a specified period to obtain its spectrum characteristic value; use the frequency of the extremely low-frequency band of the sensor The characteristic value of the frequency spectrum of the measured extremely low-frequency vibration is corrected by the response characteristics; a set of sine waves of the fundamental frequency and the multiplier frequency are generated with the corrected frequency spectrum and superimposed on the phase to obtain the corrected time-domain waveform diagram of the extremely low-frequency vibration, thereby realizing Accurate measurement, analysis, calculation and storage of extremely low frequency vibrations. The invention solves technical problems such as large error and unreliable data in the measurement of extremely low-frequency vibration in the prior art, and improves the reliability and accuracy of extremely low-frequency vibration measurement.

The invention discloses a gas ultrasonic flowmeter. A meter body of the gas ultrasonic flowmeter comprises a box body, a front end flange cover with a gas inlet and a rear end flange cover with a gas outlet, one side of the front end flange cover is connected to one end face of the box body, and a gas inlet flow dividing assembly is further arranged in the position, located on the side, of the box body. One side of the rear end flange cover is connected to the other end face of the box body and provided with a gas leading-out component, a partition plate dividing the box body into a gas inlet cavity and a gas outlet cavity is arranged in the box body and located between the gas inlet flow dividing assembly and the gas leading-out component, a hollow measuring pipe section is installed on the partition plate, and the gas inlet end of the measuring pipe section is located in the gas inlet cavity. The gas outlet end of the measuring pipe section is located in the gas outlet cavity, and an ultrasonic transducer pair is installed on the measuring pipe section and used for detecting the flow of gas. A front straight pipe section, a rear straight pipe section and a front flow stabilizer in the prior art are removed, the size of the meter body is effectively reduced, the structure is more compact, installation is more convenient, and the installation requirement of the gas ultrasonic flowmeter in the available space limited area can be met.

The invention discloses a power detection alarm device with an automatic take-up function, which comprises a protection box and a rectangular groove. The operating process of the power detection alarmdevice is that: an electric motor is directly started up; by rotation of a driving wheel, a belt and a driven wheel, two storage rollers are driven to continuously rotate; two groups of third wires are continuously lengthened; when the lengthened length meets the requirement, the electric motor is shut down; the third wires are pulled out of the inside of a passage; a wire or an electronic component which needs to be measured is fixed by a connection plug or an electrical connection wire clamp; in the electrical connection process, an illumination lamp is turned on; after electrical connection is completed, a multimeter can automatically identify electric power safety so as to facilitate detection of people; and for the protection box, a mounting spring can be squeezed by squeezing two T-shaped clamping rods symmetrically arranged so as to facilitate removing the integral protection box and facilitate internal installation of the integral detection device. According to the invention,the protection box reinforces collision resistance and waterproofness of the integral detection device; and the power detection alarm device is applicable to detection on various lines and electric equipment, is simple and convenient to operate and is convenient for an operator to use, so that working efficiency is improved.

The invention discloses a gas autoweighing device and gas autoweighing method. The device is composed of a shell, an operation panel, glass barrels, pressure sensors, upper lead limit switches, lower lead limit switches, a sample introduction channel and a sample sending channel, wherein the operation panel 12 is embedded in the surface of the shell 11, two glass barrels 1, 2 are arranged in the shell, and the top of the glass barrels is connected with the pressure sensors 5 and is connected with the sample introduction channel 7 and the sample introduction channel 8 through an air inlet valve and an air outlet valve; a piston rod 4 and a piston rod 3 are arranged in the glass barrels, the lower parts of the glass barrels are connected with ball screws 10, supports 19 are arranged outside the ball screws, the upper lead limit switches and the lower lead limit switches are arranged at the top or bottom of the supports, and the ball screws 10 are connected with motors 6. The device can be utilized to automatically weigh the gas, and is reliable in method and theory, convenient to operate, large in measuring range, strong in sealing property, small in error, high in working efficiency, and is capable of automatically accessing the measuring data, so that the device has a wide market prospect.

The present invention relates to a corrosion-resistant temperature measurement transducer, including metal protective tube fixed by utilizing connecting supporting seat and temperature-sensing element assembled in the metal protective tube. It is characterized by that a corrosion-resistant protective tube is combined on the external surface of said metal protective tube, the corrosion-resistant protective tube and metal protective tube are fixed in the connecting supporting seat together, and packaged and tightly locked by utilizing corrosion-resistant flexible sealing plug and corrosion-resistant sealing cover and by means of body-separated double-thread pipe. It can obviously raise its corrosion-resistant effect and service life, and can broaden its application range.

The invention discloses a spectral measurement system with adjustable atmosphere conditions. The spectral measurement system mainly solves the problems that an existing spectral analysis instrument islimited in application range and cannot satisfy diversified measurement. The spectral measurement system comprises a central control unit, and a gas injection system, a vacuum optical analysis chamber, an analysis chamber vacuum acquisition unit, a detection light path system and a collection light path system which are connected with the central control unit by means of signal cables. By combining the vacuum system and the optical system, the spectral measurement system realizes selective adjustment and control of the atmosphere conditions of a measured object, can eliminate interference ofair to spectral analysis completely, satisfies the analysis of specific substances under the condition of requiring characteristic atmospheres, can be adapt to analysis of high-activity, toxic, radioactive or other harmful substances, enhances the measurement capability of the spectral measurement system, and expands the measurement application range, thereby being suitable for popularization andapplication.

The invention relates to a metering device of packing machine, concretely a shutter-style multiple row synchronous metering device used in multiple row simultaneity metering and packing. It includes hopper with scraping flitch, metering plate and closing plate set in sequence under the hopper, the hopper and scraping flitch are jointed as one body. The aforementioned scraping flitch, metering plate and closing plate are all with elongated slot of equal-width and equal-distance, one side of the scraping flitch and closing plate is respectively connected with air cylinder, a slide mechanism is set in the elongated slot of the metering plate. Compared to the present technology, the invention has simple structure, can implement multiple row synchronous metering during the packing procedure, the metering scope is great and can fix on the amount of the materials by adjusting the slide position for the invention employs regulable link slide block structure in the metering plate, evades the extrusion and damnification from the machine itself to the materials for the integrated structure and bulk movement of the hopper and scraping flitch, diminishes the fine material content of the materials, also evades material pollution and improves quality of the materials.

The invention relates to a turbine flowmeter, particularly to an impeller device and a turbine flowmeter. The impeller device comprises an impeller assembly and a first rotating shaft, wherein the impeller assembly can rotate around the first rotating shaft, and the end of the first rotating shaft abuts against the impeller assembly and makes point contact with the impeller assembly. According tothe impeller device, when the impeller assembly rotates, the frictional resistance of the impeller device is smaller than that of an existing turbine flow meter, so that the metering sensitivity of the impeller device is high, and the minimum value capable of being metered is small so as to widen the metering range of the turbine flow meter.

The invention discloses a flow method for predicting coal roadway outburst through increased-resistance guide continuous drilling and a device thereof, and belongs to a method and a device for predicting the coal roadway outburst. The device consists of a hole sealing device, a flow pipe, a main machine, a coal chip funnel, an electric coal drill, a high-flow speed sensor, a low-flow speed sensor, a displacement sensor, a hand pump, a coal chip discharge pipe, a hemp-flowers drill rod, a positioning baffle plate, a guide device, a double-cone filter cylinder, a material level switch and a push rod. The percolating resistance of the coal chip discharge pipe is increased through the fuel capable of externally adding coal chips; and gas gushing from a drill hole is guided to a flow pipe with lower resistance, so that a computer and a sensor technology are combined to measure the gas gushing quantity and distribution in the drilling process under the condition of adopting the hemp-flowers drill rod to continuously drill a working surface so as to form the method for predicting the coal roadway outburst through continuous drilling. The device has the advantages of simple structure, convenience for use and accurate and reliable test, and is used for judging if a coal roadway generates the outburst in the driving process or how far the working surface of the coal roadway is forwards pushed without generating the outburst.

The invention discloses a composite transformation ratio self-adaptive intelligent current transformer device which comprises an iron core, a built-in hardware circuit unit, a power transformer primary winding, a metering current transformer primary winding, a power transformer secondary winding and a metering current transformer secondary winding. The iron core comprises a power supply iron coreand a metering iron core, the power transformer primary winding is a center-penetrating turn, and the power transformer secondary winding is uniformly wound on the power iron core. The metering current transformer primary winding is a straight-through turn, and the metering current transformer secondary winding is uniformly wound on the metering iron core. The power transformer primary winding isconnected in series with the metering current transformer primary winding, and the power transformer secondary winding and the metering current transformer secondary winding are connected with the built-in hardware circuit unit. The composite transformation ratio self-adaptive intelligent current transformer device is wide in metering range and high in metering precision, enables the problem of electric energy metering missing to be reduced and the metering accuracy to be improved, and guarantees the fairness of the electric energy transactions.

The invention relates to the technical field of workpiece measurement, and discloses a floating connection device and a floating measurement device. The floating connection device comprises a first base block, a support connector and a second base block; the support connector can be movably arranged on the first base block; the second base block can be movably arranged on the support connector; the support connector can drive one of the first base block and the second base block to move along a first axis with respect to the other one of the first base block and the second base block and can rotate around the first axis; one of the first base block and the second base block can move along a second axis with respect to the support connector and can rotate around the second axis; an includedangle between the first axis and the second axis is more than zero degree. The floating connection device has four degree of freedom, so that the application range can be enlarged, for example, the good real-time contact between the test head component on the floating connection device and the workpiece under test can be significantly enhanced, the test head component is prevented from being damaged, and the measurement accuracy is enhanced.

The invention relates to the technical field of natural gas collection and transportation and particularly relates to a double-pipe metering device, a double-pipe metering method and a double-pipe metering system. The double-pipe metering device comprises a main pass metering section and a bypass metering section which are connected in parallel, wherein the main pass metering section and the bypass metering section are connected with an upstream pipeline through the same inlet and connected with a downstream pipeline through the same outlet, and the bypass metering section is used for being matched with the main pass metering section to meter output flow. According to the device, the metering process is optimized, the metering range is expanded, the application range is wide, technical defects of a single-tube metering mode are overcome, metering precision is improved, and economic loss of downstream users is reduced; the bypass metering section can be opened and the main metering section can be closed for maintenance under the condition of not stopping conveying, so production efficiency is improved; the double-pipe metering system can achieve all-weather automatic control, manual intervention is not needed, labor intensity and production cost can be greatly reduced, and safety and accuracy of pipeline conveying are improved.

The invention discloses an automatic weighted titration type micro-metering method and device. A A-type titration pipe assembly, a B-type titration pipe assembly and a C-type titration pipe assembly, which are triangularly arranged, are arranged between a liquid storage tank and a bracket, the A-type titration pipe assembly comprises titration pipes with range weights respectively being 1 microliter, 2 microliters and 5 microliters, the B-type titration pipe assembly comprises titration pipes with range weights respectively being 10 microliters, 20 microliters and 50 microliters, the C-type titration pipe assembly comprises titration pipes with range weights respectively being 100 microliters, 200 microliters and 500 microliters; an electronic control valve connected with a control system is arranged on each titration pipe, the control system is used for completing the metering by calling at least electromagnetic valves with at least titration time, sequentially enabling the titration pipes to execute the titration times of corresponding electronic control valves according to the range weights in a descending order, and allocating different ranges of the titration pipes according to different weights by adopting a linear combination manner; the titration metering decomposition is completed by titration pipes with different weights, thus the accuracy of replenishing liquid is improved, and the high-precision micro-metering is completed.

The invention belongs to the fluid measurement technology field and relates to a multiphase flow measurement method based on a double-section impedance type long waist cone sensor. The adopted sensor comprises a cone throttling element, a systolic blood pressure drop differential pressure transmitter, a permanent pressure loss differential pressure transmitter and an electrical sensitive sensor. The method comprises the following steps: collecting two pairs of differential pressure signals generated by the cone throttling element; utilizing the electrical sensitive sensor to collect an electrical signal; calculating the total mass flow rate, the each-phase mass flow rate and the each-phase mass content according to a double-differential pressure model of a single throttling element; utilizing a support vector machine to realize classify, identify and pre-judge a flow pattern according to the measurement data of the differential pressure signals and the electrical signal; adopting a capacitance model to measure a mixed fluid dielectric constant; adopting a conductivity model to measure the mixed fluid conductivity; and calculating the procedure parameter of oil-gas-water three-phase flow. The multiphase flow measurement method is not influenced by the fact that whether a multiphase flow continuous phase is conducted or not, has the characteristics of high measurement precision,high reliability and the like and can obtain more measurement information.

The invention belongs to the technical field of fluid measurement, and relates to multi-phase flow measuring methods based on a single-section impedance long-waist internal cone sensor. The adopted sensor comprises a cone throttling piece, a systolic pressure drop differential pressure transmitter, a permanent pressure loss differential transmitter and an electrical sensitive sensor. According tothe difference of properties of continuous phases, the invention provides two measuring methods which have the same inventive concept and respectively comprise the following steps of: collecting two pairs of differential signals generated by the cone throttling piece; collecting electrical signals by utilizing the electrical sensitive sensor; calculating the total mass flow rate, the mass flow rate of each phase and the mass content of each phase according to a double-differential model of a single throttling piece; selecting a corresponding electrical method according to whether the continuous phases are conductive, and calculating the section content of each phase; and selecting a corresponding calculating model, and calculating the procedure parameters of an oil phase, a gas phase and an aqueous phase. The multi-phase flow measuring method is characterized by high measuring precision, high reliability, capability of obtaining more measurement information, low cost and the like, andcan be widely applied in the industries of petroleum, chemical engineering, energy power, metallurgy and the like.

The invention relates to the technical field of optical measurement, and discloses refractive index measurement equipment and a refractive index measurement method and device. The refractive index measurement range of the refractive index measurement equipment is adjustable, and thus the measurement application range is widened. The refractive index measurement equipment comprises a magnetic field generation device generating an adjustable magnetic field, a shell, a light transmitter, a light receiver, a sample to be measured and a control processor, wherein the shell is located in the magnetic field generated by the magnetic field generation device and is filled with magnetofluid, the light transmitter, the light receiver and the sample to be measured are immersed in the magnetofluid, and the control processor is connected with the magnetic generation device and the light receiver. The light transmitter is used for transmitting light towards the sample to be measured, the light receiver is used for receiving light reflected by the sample to be measured, and the included angle of the reflected light and the incident light is a set included angle; the control processor is used for judging whether total reflection can happen, determining the refractive index of the magnetofluid according to the critical magnetic field intensity in total reflection and determining the refractive index of the sample to be measured according to the refractive index of the magnetofluid and the set included angle.

The invention discloses a direct-current ammeter with a wide metering range. The direct-current ammeter comprises a sampling element and a sampling information processing circuit, a sampling information sending end of the sampling piece for transmitting the acquired information is connected with a sampling information receiving end of the sampling information processing circuit; the sampling information processing circuit comprises a metering chip, an anti-aliasing filter circuit and a voltage division sampling circuit for acquiring voltage signals of a load and a direct-current charging pile;the input end of the anti-aliasing filter circuit serves as the sampling information receiving end of the sampling information processing circuit, the output end of the anti-aliasing filter circuit is connected with the current sampling signal receiving end of the metering chip, and the output end of the voltage division sampling circuit is connected with the voltage signal receiving end of the metering chip. The invention provides a direct-current ammeter with a wide metering range.

The invention provides a gas metering device which comprises a metering tube, a balance cup, and a lifting unit, wherein the metering tube is used to store gas needing to be metered; the balance cup communicates with the metering tube by a first pipeline, and the balance cup is designed to store a liquid communicating with the external environment; the lifting unit is connected to the balance cupso as to drive vertical motion of the balance cup; and after injection of the gas into the metering tube, the lifting unit can drive the balance cup to move, make the liquid level in the balance cup and the liquid level in the metering cup balanced and compute the volume of the gas according to a motion distance of the balance cup. The gas metering device has the advantage that automatic collection and metering of the volume of gas which has unsteady flows, uncertain constituents and high pressure, and is generated in a lab can be achieved.

The invention discloses a gas-liquid two-phase flow variable-proportion thief, and belongs to the field of multiphase flow metering. The invention relates to a multiphase metering and sampling devicewith an adjustable diversion ratio. The multiphase metering and sampling device mainly comprises a diversion pipe, a main fluid chamber, a sampling chamber and sampling pipes, diversion holes are uniformly distributed in the circumferential direction of the diversion pipe, and the sampling pipes are arranged at outlets of the partial diversion holes; each sampling pipe is composed of an outer plugbody and an inner plug body, and the inner plug bodies can move up and down in the outer plug bodies; and by adjusting the sampling pipes, the flow rate of sub-fluid entering the sampling chamber canbe changed, and then the expected diversion ratio is obtained. Compared with an existing gas-liquid two-phase flow sampling device, the multiphase metering and sampling device is small in size and compact in structure, the distribution ratio can be adjusted at will, and sampled fluid and main fluid have the same gas-liquid composition and are not affected by parameters such as inlet gas-liquid phase flow velocity and flow pattern.

A dry-type high-pressure metering box is an outdoor dry-type two-element metering box and suitable for a 50Hz 15-20kV three-phase alternating current power line or a distribution transformer. By using the double-transformation-ratio wide-quantitation-limit high-pressure metering box, the transformation ratio is switched in the metering box by changing a special mutual inductor terminal box connecting piece without power outage, a meter box is integrally connected with a combined mutual inductor to form the one-piece high-pressure metering box, the meter box and the combined mutual inductor are installed and used on a column or respectively installed. When the meter box and the combined mutual inductor are respectively installed, the combined mutual inductor is installed on the column, and the meter box is installed under the combined mutual inductor and connected with the combined mutual inductor through a sheathed cable. The problem that an existing high-pressure metering box is high in failure rate and short in service life and is easily lost and stolen is solved.