35results about How to "Turndown ratio" patented technology

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 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 relates to an air flow measurement device. The air flow measurement device comprises a tube wall and an orifice plate, wherein the orifice plate is arranged on the tube wall in a fixing mode, the orifice plate is perpendicular to the axis direction of the tube wall, and the center of the orifice plate is perpendicular to the axis of the tube wall and is provided a circular-type main orifice, a plurality of satellite orifices are formed and uniformly distributed on the outer edges of the main orifice. The air flow measurement device makes an air fluid formed an ideal fluid in the measurement, and improves the measurement accuracy.

The invention belongs to the technical field of flow measurement, in particular to a plug-in type semi-parabola multi-point pressure tapping flow sensor. The plug-in type semi-parabola multi-point pressure tapping flow sensor comprises a pressure tapping structure, a T-shaped mounting pipe base and a pressure detection element. A fluid flows through a pressure detection pipe, total pressure is measured at one side of a positive pressure hole of an incident flow surface, static pressure is measured at one side of a negative pressure hole of a back flow surface, the two pressure becomes stable and reliable after being equalized by means of a positive pressure equalizing pipe and a negative pressure equalizing pipe, a pressure difference is generated between the two pressure, and the pressuredifference is transmitted to a differential pressure transmitter and a flow totalizer by means of a positive pressure tapping pipe and a negative pressure tapping pipe, so that flow measurement is realized. The plug-in type semi-parabola multi-point pressure tapping flow sensor adopts semi-parabola pressure tapping, improves the precision and stability of the flow sensor, and greatly increases the measuring range ratio of the flow sensor, so that the differential pressure type flow sensor has better application prospects, and the plug-in type semi-parabola multi-point pressure tapping flow sensor has the advantages of high precision, wide measuring range, high reliability, small pressure loss and the like.

The present invention relates to the flow detection field, in particular to a low power consumption two-wire system vortex street flowmeter which consists of a piezoelectric transducer, a charge amplifier, a voltage amplifier, a program-controlled amplifier, a lowpass, a voltage follower, a peak detection circuit, a band-pass filter set, a multiway switch gate circuit, a wave shaping circuit, a singlechip, a man-machine interface circuit and a 4-20 mA output and power management circuit, wherein, the singlechip detects the peak value and the frequency of the vortex street signal to amplify and filter the vortex flow signals by controlling the program-controlled amplifier and the band-pass filter. The technology overcomes the problems that the prior art can not achieve low power consumption while measuring small flow, expanding measuring range rate and improving measuring precision effectively. While ensuring measuring small flow, expanding measuring range rate and improving measuring precision effectively, the invention achieves low power consumption of outputting the direct current of 4-20 mA and the operating current less than 4mA and achieves the two-wire system operation.

The invention discloses an elastic variable cross-section device, which comprises a detection pipeline, an axial deformation compensation pipe, a driving part and an execution part, and is characterized in that the detection pipeline is used for allowing a to-be-detected fluid to pass through and is made of an elastic material; the axial deformation compensation pipe is connected between the two ends of the detection pipeline and the flow pipeline to be detected and used for compensating axial length changes caused in the extrusion deformation process of the detection pipeline. The driving part is used for providing driving force for the executing part; and the execution part is in transmission connection with the power output end of the driving part, and extrudes or releases the detectionpipeline under the action of driving force, so that the cross sectional area in the detection pipeline is changed. The problems of complex detection pipeline, high cost, large installation space andthe like in the prior art are solved, the measuring range ratio is widened by changing the cross section of the detection pipeline on line, the cost is greatly reduced, and the installation space is reduced; simple structure and easy operation are realized.

The flowmeter is composed of vortex street type sensing head, charge amplifier, differential amplifier, filter of resisting mixing and piling, embedded type micro control unit (MCU), and digital signal processor (DIP). MCU and DSP constitute dual kernel CPU. With A / D conversion being carried out in MCU, signal though interface is transferred to DSP. Processed data through HPI interface are transferred back to MCU, which completes functions of displaying, controlling, storing and remote transferring. The flowmeter is capable of picking up information under strong noise background without need of changing circuits depended on calibers, gases and liquids. Specification of the flowmeter is as following: velocity of flow 0.18m / s- 6.22m / s, range ratio 1:35, Reynolds number 4.90-10 to the power 2.

A multi-phase flow rapid separation metering device, which relates to the technical field of oil field equipment, includes a separation tank, a liquid level control tank and a control box. A device frame is provided at the bottom of the separation tank, and an annular pipe is arranged around the device frame. One side of the annular pipe is It communicates with the feed port, and the ring pipe is equipped with a separation mechanism, which is coiled outside the separation tank. The end of the liquid level control tank is connected to the bottom end of the liquid level control tank through the pipe four, the top of the liquid level control tank is connected to the pipe six through the two pipes, the upper part of the liquid level control tank is connected to the six pipes through the three pipes, and the lower part of the liquid level control tank is connected to the six pipes through the five pipes Connected, the tank body of the liquid level control tank is provided with a liquid level gauge. The multi-phase flow rapid separation metering device achieves the purpose of multi-phase flow rapid read separation and continuous metering.

The invention relates to a vortex shedding flow meter based on self-adaptive fast Fourier transformation, which comprises a charge amplifier, a first filter, a program-controlled voltage amplifier, a second filter, a program-controlled scmitt trigger, a bias voltage circuit, a singlechip computer, an LDO (Low Dropout Regulator) circuit, a reset circuit, a key input, a 4-20mA output circuit and anLCD (Liquid Crystal Display) circuit. A signal generated by a vortex shedding sensor is connected with the charge amplifier; the output of the charge amplifier is connected with the first filter; theoutput of the first filter is connected with the program-controlled voltage amplifier; the output of the program-controlled voltage amplifier is connected with the second filter; the output of the second filter is divided into two paths, wherein one path is connected with the singlechip computer; the other path is connected with the program-controlled scmitt trigger; and the program-controlled scmitt trigger is connected with the singlechip computer. According to the vortex shedding flow meter disclosed by the invention, various noises can be effectively inhibited and low-flow and high-precision measurement is realized, thereby the measuring range ratio is enlarged and the measuring precision and the sensitivity are improved.

The invention discloses a denitration and ammonia spraying pipeline flow monitoring device taking a reducing agent as urea. The device comprises a high temperature measurement pipeline, an upstream pressure coil, an upstream connection pipe, a downstream pressure coil, a downstream connection pipe and a differential pressure gauge, wherein the upstream pressure coil and the downstream pressure coil are respectively coiled on the outer wall of the high temperature measurement pipeline; both the coiling cycles of the upstream pressure coil and the downstream pressure coil are greater than or equal to 2; one end of the upstream pressure coil is communicated with the upstream in the high temperature measurement pipeline; and the other end of the upstream pressure coil is connected with a high-pressure port of the differential pressure gauge through the upstream connection pipe. One end of the downstream pressure coil communicates with the downstream in the high temperature measurement pipeline; and the other end of the downstream pressure coil is connected with a low-pressure port of the differential pressure gauge through the downstream connection pipe. The device is particularly suitable for gas flow measurement of non-uniform flow fields of large-caliber pipelines, has the technical advantages of being high in sensitivity, high in accuracy, wide in range ratio and small in throttling loss and preventing blockage, and is particularly suitable for the occasions with the problem that certain components in gas measurement mediums are condensed and crystalized with cold.

The invention discloses a vortex flowmeter based on multi-sensor information fusion, which can effectively suppress the interference of strong periodic vibration noise in the piezoelectric sensor signal, extract useful vortex signals therefrom, and accurately measure the flow velocity of the fluid. Its core is that a temperature sensor and a strong vibration-resistant differential pressure sensor are added to the traditional piezoelectric vortex flowmeter, and the temperature sensor can be used to compensate the temperature drift of the piezoelectric sensor and differential pressure sensor; The multi-sensor data fusion algorithm of Unscented Kalman Filter (UKF) integrates the average value of the differential pressure output by the differential pressure sensor and the frequency value of the piezoelectric signal obtained by the piezoelectric sensor, which improves the digital band-pass filter. The accuracy of the device lock. The invention can improve the signal-to-noise ratio of the vortex street signal measurement, has the advantages of enhancing the vibration resistance of the piezoelectric vortex street flowmeter, reducing the minimum flow rate measurement lower limit, widening the range ratio and the like.

The invention discloses a method and a flow meter for measuring combined platinum-film gas flow. A detecting rod is adopted to be inserted in a measuring pipe in diameter direction. The detecting rod is fixed with one or a plurality of platinum-film probes, which integrate a combination of a flow probe and a temperature probe. Every probe can feel the flow and the temperature signals of the gas. The quality flow of the gas can be obtained when the flow and temperature signals are acquired and processed. The flow value and the temperature value can be displayed and remotely sent. The combined platinum-film gas flow meter has the advantages of simple structure, low investment, high precision, little press loss, wide range ratio (being capable of reaching to about one hundred times), almost zero flux lower limit, etc. No such flow meter with simple structure and perfect comprehensive performance exists in gas flow detecting meters. Therefore, the economic benefits are very obvious. The meter is equipped with an integrated structure and multi-parameter measuring functions of flow, temperature, etc.

The invention provides a drip metering method of an ultrasonic water meter and relates to the field of application of water meter. The drip metering method is used for solving the problem that a running-water company`s loss is generated when a user utilizes a drip method to steal water due to the structural defects of an existing common mechanical water meter. The drip metering method of the ultrasonic water meter comprises the following steps: collecting the water flow by use of an ultrasonic time difference theory; and comparing the collected water flow with starting flow and minimum flow during measurement, thereby eliminating drip errors and further improving the metering accuracy of the water meter. The drip metering method is applicable to any environment requiring the water meter to meter the water flow.