CN113029257A - Composite vortex street flowmeter - Google Patents
Composite vortex street flowmeter Download PDFInfo
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- CN113029257A CN113029257A CN202110175338.0A CN202110175338A CN113029257A CN 113029257 A CN113029257 A CN 113029257A CN 202110175338 A CN202110175338 A CN 202110175338A CN 113029257 A CN113029257 A CN 113029257A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/20—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
- G01F1/28—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow by drag-force, e.g. vane type or impact flowmeter
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
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Abstract
The invention provides a composite vortex shedding flowmeter, and relates to the technical field of fluid measurement. The composite vortex street flowmeter comprises a flowmeter main body unit, a control unit and a display unit, wherein the flowmeter main body unit comprises a pipe body, a vortex street generator and a detection assembly, the vortex street generator is installed in the pipe body, and the vortex street generator is provided with a detection channel. The detection assembly comprises a detection thermal flight time and a calorimetric sensing element, and the detection thermal flight time and the calorimetric sensing element are positioned in the detection channel; the thermal flight time detection and calorimetric sensing element is a silicon-based sensor and is connected with the control unit. The composite vortex street flowmeter can detect the volume flow, the mass flow and the density of fluid which generates a vortex street state and does not generate the vortex street state in a pipe body, thereby achieving the purpose of expanding the dynamic range of measurement and simultaneously being capable of measuring the fluid in different states.
Description
Technical Field
The invention relates to the technical field of fluid measurement, in particular to a composite vortex shedding flowmeter.
Background
The vortex shedding flowmeter has the characteristics of high detection precision, simple structure, no movable mechanical parts, high reliability, small maintenance amount and the like, and is widely applied to the flow measurement of liquid and gas in the industrial process. The current vortex shedding flowmeter has small measuring range and cannot measure when the Reynolds number is lower than that of a vortex street, thereby limiting the dynamic range of measurement; the size of the standard vortex shedding generator also results in a vortex shedding flowmeter with a large pressure loss. In addition, the vortex street flowmeter is a pure volume meter, and cannot measure the mass flow of the fluid, particularly the density of the fluid. Thus, in current practical applications, there are large deviations in, for example, steam metering.
Disclosure of Invention
The invention aims to provide a composite vortex shedding flowmeter, which aims to solve the technical problems that the existing vortex shedding flowmeter has small measurement dynamic range and large pressure loss, and cannot measure the mass flow of fluid, particularly the density of the fluid.
In order to solve the problems, the invention provides a composite vortex street flowmeter, which comprises a flowmeter main body unit, a control unit and a display unit, wherein the flowmeter main body unit comprises a pipe body, a vortex street generator and a detection assembly, the vortex street generator is arranged in the pipe body, the vortex street generator is provided with a detection channel, the detection assembly is arranged in the pipe body, and a detection thermal flight time and calorimetric sensing element of the detection assembly is positioned in the detection channel, wherein the detection thermal flight time and calorimetric sensing element consists of a first temperature sensor, a micro heat source sensor, a second temperature sensor and an ambient temperature sensor which are sequentially arranged on a detection surface of the silicon substrate at intervals;
the thermal time-of-flight and calorimetric sensing elements are deposited on the thin film above the insulating cavity of the silicon substrate;
the thermal time-of-flight and calorimetric sensing elements and the display unit are connected with the control unit.
Optionally, the detection channel is a linear type or a venturi flow channel, and the length direction of the detection channel is arranged at an angle to the horizontal plane.
Optionally, the first port of the detection channel is higher than the second port of the detection channel, and the detection channel is inclined in a downstream direction of the fluid from the first port to the second port along a flow direction of the fluid in the pipe body.
Optionally, the angle between the length direction of the detection channel and the flow direction of the fluid is 60 ° to 120 °.
Optionally, the vortex street generator is trapezoidal, and the height of the vortex street generator is 0.18-0.22 times of the inner diameter of the pipe body.
Optionally, the thermal flight time detection and calorimetric sensing elements are disposed on the side wall of the detection channel.
Optionally, the dynamic range that the composite vortex shedding flowmeter can measure is 100: 1-300: 1.
Optionally, a flow field dc current device and a flow field rectifier are disposed at the fluid inlet end of the pipe body.
Optionally, the composite vortex street flowmeter further comprises a meter head and a connecting assembly, the connecting assembly is connected between the pipe body and the meter head, a mounting cavity is arranged in the meter head, and the control unit is accommodated in the mounting cavity; the display unit comprises a display, and the display is mounted on a port of the mounting cavity.
Optionally, the detection assembly is connected with the control unit through a signal connector, and the signal connector is made of a high-temperature heat-insulating material.
Optionally, the connection assembly includes a heat insulation sleeve, the heat insulation sleeve is connected between the pipe body and the gauge outfit, and the signal connection member and the part of the detection assembly extending out of the pipe body are covered in the heat insulation sleeve.
The invention provides a composite vortex street flowmeter, wherein when a pipe body of the composite vortex street flowmeter is connected in a pipeline with a certain pipe diameter in which fluid flows, the fluid flows through a vortex street generating body, pressure difference exists at two ends of a detection channel, and when the Reynolds number of the fluid is larger, and the fluid flows through the vortex street generating body to generate a vortex street, the vortex flows through the detection channel under the action of the pressure difference. The fluid is pulsating flow, and in the process that the pulsating flow flows through the detection thermal flight time and the calorimetric sensing element, the first temperature sensor and the second temperature sensor for detecting the thermal flight time and the calorimetric sensing element can detect the maximum value and the minimum value of the time and the amplitude of a temperature field on the sensing element caused by the pulsating flow, and transmit corresponding signals to the control unit, the control unit correspondingly calculates the number of the pulsation or the vortex street number in unit time, and the number is directly related to the volume flow of the fluid in the pipe body through comparison of the flow value of the standard device during manufacturing, so that the first group of volume flow of the fluid is obtained. Meanwhile, in the process that the pulsating flow flows through the detection thermal flight time and the calorimetric sensing element, a second group of volume flows are obtained by measuring the transfer time of heat between sensors at a fixed distance; the micro heat source sensor is associated with the mass flow of the fluid flowing through the pipe body through the amplitude variation of the heat conduction of the fluid in the detection channel, so that the mass flow of the fluid is obtained, the control unit compares the numerical values of the two groups of volume flows, and the calculation of the fluid pressure is realized through the numerical value of the mass flow and the numerical value of the environment temperature measured by the environment temperature sensor. Since the thermal flight time detection and calorimetric sensing elements have excellent thermal insulation structures, the fast response time of the thermal flight time detection and calorimetric sensing elements can simultaneously measure the fluid static characteristics between two eddy currents or pulsating flows. The micro heat source sensor can measure the value of thermal conductivity, the signal of the modulation wave on the micro heat source sensor received by the temperature sensor is the direct measurement of the diffusion coefficient of the fluid, and the density of the fluid can be measured through the values of the thermal conductivity and the heat capacity.
Under the condition that the Reynolds number of the fluid is small, no vortex street is generated in the pipe body. However, due to the design of the flow channel, the fluid on two sides of the detection channel still has pressure difference, so that the fluid with corresponding flow velocity can still flow through the detection channel and correspondingly sequentially flow through the first temperature sensor, the micro heat source sensor, the second temperature sensor and the ambient temperature sensor on the thermal flight time and heat measurement sensing element. The method comprises the steps of detecting the heat flight time and transmitting a temperature field change signal generated by fluid measured by a calorimetric sensing element to a control unit, wherein the control unit stores a corresponding relation between temperature difference verified by a standard device and mass flow, so that the corresponding mass flow is obtained, and the volume flow of the fluid can be obtained according to the measured data of time functions of temperature field changes among different temperature sensors and the accurate distance among known sensors. This way both the volume flow and the mass flow of the fluid to be examined can be measured simultaneously.
The measured values of the volume flow, the mass flow, the density, the vortex street frequency, the pressure, the accumulated flow and the like can be displayed through the display unit, and a user can intuitively obtain the information according to the display content of the display unit.
The composite vortex street flowmeter can detect the volume flow and the mass flow of vortex street fluid flowing through the flowmeter main body unit and fluid without generating a vortex street state, thereby achieving the purposes of ultra-low flow measurement and extended measurement dynamic range. The measured mass flow and density of the fluid, temperature and thus calculated fluid pressure further extend the measurement capability of conventional vortex street flow. The measuring accuracy of the flowmeter can be greatly improved for fluid with variable density, such as steam in particular.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a first schematic view of a composite vortex shedding flowmeter provided by the present invention;
FIG. 2 is a second schematic view of the composite vortex shedding flowmeter of the present invention
FIG. 3 is an exploded view of the composite vortex shedding flowmeter of FIG. 2;
FIG. 4 is a schematic diagram of a thermal time of flight and calorimetric sensing element in the composite vortex shedding flowmeter provided by the present invention;
FIG. 5 is a schematic view of a vortex street generator in the composite vortex street flowmeter provided by the invention.
Description of reference numerals:
10-a flow meter body unit; 100-a tube body; 110-a flow field dc; 120-a flow field rectifier; 200-vortex street generator; 210-a detection channel; 211 — a first port; 212-a second port; 300-a detection component; 310-detecting thermal time of flight and calorimetric sensing elements; 311-silicon substrate; 312-a film; 313 — a first temperature sensor; 314-micro heat source sensor; 315-a second temperature sensor; 316-ambient temperature sensor; 317-connecting line; 318-pad; 400-a connection assembly; 410-a heat insulating sleeve; 420-a screw; 500-header; 510-mounting a cavity; 520-a front cover; 530-front sealing ring; 540-back seal ring; 550-rear cover; 560-plug; 600-a display; 700-a control unit; 800-industrial interface circuit board; 900-signal connection.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment provides a composite vortex street flowmeter, which comprises a flowmeter main unit 10, a control unit 700 and a display unit, as shown in fig. 1-3, the flowmeter main unit 10 comprises a pipe body 100, a vortex street generator 200 and a detection assembly 300, the vortex street generator 200 is installed in the pipe body 100, the vortex street generator 200 is provided with a detection channel 210, the detection assembly 300 is installed in the pipe body 100, and a detection thermal flight time and a detection thermal sensing element 310 of the detection assembly 300 are located in the detection channel 210; as shown in fig. 4, the element 310 for detecting thermal flight time and calorimetric sensing includes a silicon substrate 311, and a first temperature sensor 313, a micro-heat source sensor 314, a second temperature sensor 315 and an ambient temperature sensor 316 which are sequentially arranged at intervals are disposed on a detection surface of the silicon substrate 311; the first temperature sensor 313, the second temperature sensor 315, the micro heat source sensor 314, the ambient temperature sensor 316 and the display unit are all connected with the control unit 700.
The composite vortex shedding flowmeter provided by the embodiment comprises a detection component 300 for detecting fluid-related physical characteristic parameters, a control unit 700 for converting the detected physical characteristic parameters into target parameters, and a display unit for displaying the detected physical characteristic parameters and the converted target parameters, wherein the detection component 300 comprises a pipe body 100 for flowing a fluid to be detected, a vortex shedding generator 200, and a detection thermal flight time and thermal sensing element 310 for detecting the fluid in a detection channel 210 in the vortex shedding generator 200, and the detection thermal flight time and thermal sensing element 310 adopts a MEMS thermal flight time and thermal sensing element.
When the composite vortex flowmeter is used, the pipe body 100 of the composite vortex flowmeter is connected to a fluid pipeline with a certain pipe diameter, fluid flows through the vortex street generator 200, and the fluid is forced to flow through the detection channel by the pressure difference between the two ends of the detection channel 210. When the reynolds number of the fluid is larger, a vortex street is generated in the pipe body 100, the fluid flowing through the detection channel 210 under the action of pressure difference is pulsating flow, in the process that the pulsating flow flows through the detection thermal flight time and the calorimetric sensing element 310, the maximum and minimum values of the time and the amplitude of the temperature field on the sensing element caused by the pulsating flow can be detected by the first temperature sensor 313 and the second temperature sensor 315 on the detection thermal flight time and the calorimetric sensing element 310, and corresponding signals are transmitted to the control unit 700, the control unit 700 correspondingly calculates the number of pulsation or the vortex street number in unit time, compares the number of pulsation or the vortex street number with the flow value of the standard during manufacturing, and directly correlates with the volume flow of the fluid in the pipe body 100, so as to obtain a first group of volume flow of the fluid. Meanwhile, in the process of detecting the thermal flight time and the calorimetric sensing element 310 by the pulsating flow, a second group of volume flows are obtained by measuring the transfer time of heat between the first temperature sensor 313 and the micro heat source sensor 314 or between the micro heat source sensor 314 and the second temperature sensor 315 which are at fixed distances; the micro heat source sensor 314 is associated with the mass flow of the fluid flowing through the pipe body 100 by detecting the amplitude variation of the heat conduction of the fluid in the channel, so as to obtain the mass flow of the fluid, and the control unit 700 compares the values of the two sets of volume flows, and calculates the fluid pressure by using the value of the mass flow and the value of the ambient temperature detected by the ambient temperature sensor. Since the thermal flight time detection and calorimetric sensing element 310 has a superior thermal isolation structure, its fast response time simultaneously measures the hydrostatic behavior between two vortices or pulsating flow. The micro heat source sensor can measure the value of thermal conductivity, the signal of the modulation wave on the micro heat source sensor received by the temperature sensor is the direct measurement of the diffusion coefficient of the fluid, and the density of the fluid can be measured through the values of the thermal conductivity and the heat capacity.
In the case where the reynolds number of the fluid is small, no vortex street is generated in pipe body 100. However, according to the flow channel design of the present invention, the fluid on both sides of the detection channel 210 still has a pressure difference, so that the fluid with a corresponding flow rate can still flow through the detection channel 210, and correspondingly sequentially flow through the first temperature sensor 313, the micro heat source sensor, the second temperature sensor 314, and the ambient temperature sensor 316 on the thermal sensing element 310 for detecting the thermal flight time. The temperature field change signal generated by the fluid measured by the calorimetric sensing element 310 and the detected thermal flight time is transmitted to the control unit 700, the control unit 700 stores the corresponding relationship between the temperature difference verified by the standard and the mass flow, so as to obtain the corresponding mass flow, and the volume flow of the fluid can be obtained from the measured data of the time function of the temperature field change between different temperature sensors and the accurate distance between the known sensors. This way both the volume flow and the mass flow of the fluid to be examined can be measured simultaneously.
The measured values of the volume flow, the mass flow, the density, the vortex street frequency, the pressure, the accumulated flow and the like can be displayed through the display unit, and a user can intuitively obtain the information according to the display content of the display unit.
The composite vortex street flowmeter can detect the volume flow and the mass flow of vortex street fluid flowing through the flowmeter main body unit and fluid without generating a vortex street state, thereby achieving the purposes of ultra-low flow measurement and extended measurement dynamic range. The measured mass flow and density of the fluid, temperature and thus calculated fluid pressure further extend the measurement capability of conventional vortex street flow. The measuring accuracy of the flowmeter can be greatly improved for fluid with variable density, such as steam in particular. Preferably, the silicon substrate 311 may be made of silicon, glass, ceramic, or other materials with a heat insulation structure, so as to effectively solve the reliability problem of the application of the thermal sensing technology in the vortex street measurement technology; in particular, the composite vortex street flow meter of the present application is not limited to gas, liquid and vapor, and is also applicable to fluids of multiphase media.
Specifically, the dynamic range of the composite vortex shedding flowmeter can be measured within 100: 1-300: 1, and preferably, the dynamic range is expanded to 150: 1.
Alternatively, in this embodiment, as shown in fig. 4, the first temperature sensor 313, the micro heat source sensor 314, and the second temperature sensor 315 on the detection surface of the thermal sensing element 310 and the detection time are disposed on the film 312, and a thermal insulation cavity is disposed below the film 312. The film 312 can reduce the additional heat conduction influence of the temperature of the silicon substrate 311 on the fluid temperature detected by the first temperature sensor 313, the micro heat source sensor 314 and the second temperature sensor 315, so that the accuracy and the dynamic response time of the fluid temperature detection of the first temperature sensor 313, the micro heat source sensor 314 and the second temperature sensor 315 are improved, and the accuracy of the composite vortex shedding flowmeter on the fluid flow detection is correspondingly improved.
In the present embodiment, as shown in fig. 4, the ambient temperature sensor 316 for detecting the thermal flight time and the calorimetric sensor element 310 is mounted on the detection surface, and is located on the silicon substrate 311 with better heat conduction and is far away from the micro heat source sensor 314. The ambient temperature sensor 316 is capable of sensing the ambient temperature of the fluid within the sensing channel 210. When the pressure difference between two pulsating flows generating a vortex street in the pipe body 100 or between two ends of the detection channel 210 is not enough to form flowing fluid in the pipe body, the fluid is in a relatively static state, the modulation signal of the thermal flight time of the micro heat source sensor 314, which is detected by the first temperature sensor 313 or the second temperature sensor 315, is related to the thermal diffusivity of the fluid, and the control unit 700 receives the related signal and obtains the thermal diffusivity of the fluid; the heat dissipation of the micro heat source sensor 314 itself is correlated with the thermal conductivity of the fluid, and the control unit 700 receives the correlation signal and obtains the thermal conductivity of the fluid; the temperature rise per unit time measured by the first temperature sensor 313 or the second temperature sensor 315 is correlated with the specific heat capacity of the fluid, and the control unit 700 receives the correlated signals and obtains the specific heat capacity of the fluid, so that the density value of the fluid can be calculated. In particular, in steam metering, where the steam may be in the form of a saturated or unsaturated medium, the medium of the steam is the same even if the fluid pressure is not changed, but the density tends to vary greatly during use; compared with the prior art, the calibration of the composite vortex shedding flowmeter cannot be confirmed due to the fact that the real use condition cannot be simulated, and water flow is used as a substitute, so that trade metering deviation and dispute are caused; the composite vortex shedding flowmeter can measure a plurality of fluid physical parameters including density on line, and can correspond the detected steam density to the standard fluid density value corresponding to the fluid pressure determined by mass flow and volume flow, so that the fluid physical property change state and the standard volume flow parameter are obtained, the technical key of density change in steam measurement is effectively solved, and the integrity and fairness of steam metering are guaranteed.
In addition, the first temperature sensor 313 and the second temperature sensor 315 are made of thermosensitive materials and are affected by the ambient temperature, and the fluid temperatures measured by the first temperature sensor 313 and the second temperature sensor 315 can be calibrated according to the ambient temperature measured by the ambient temperature sensor 316, so that the influence of the ambient temperature on the resistance values of the first temperature sensor 313 and the second temperature sensor 315 due to the detected temperature is eliminated, and the fluid actual temperature can be obtained more accurately. In addition, the first temperature sensor 313, the micro heat source sensor 314, the second temperature sensor 315, and the ambient temperature sensor 316 are collectively integrated into a single thermal flight time and calorimetric sensing element 310, so that the single thermal flight time and calorimetric sensing element 310 can realize the fluid volume flow, the mass flow, the fluid density, the fluid temperature, the fluid pressure, the fluid thermophysical parameters and the like in the thermal flight time and calorimetric measurement mode, and has a simple structure and strong functionality. Specifically, the signals of the sensors can be connected to the pads 318 through the corresponding connecting lines 317.
Specifically, in this embodiment, as shown in fig. 5, the detection channel 210 may be in a linear shape or a venturi shape, and the length direction of the detection channel 210 is disposed at an angle to the horizontal plane. Arrows in fig. 5 indicate a flowing direction of the fluid, the detection channel 210 extends in a radial cross section of the pipe body 100, and the detection channel 210 is not horizontally disposed, so that two end ports of the detection channel 210 are located at different heights, which can increase a pressure difference between two sides of the detection channel 210, and even if the reynolds number is lower than the vortex street occurrence frequency, there is no pulsating flow in the fluid, because a large pressure difference exists between two sides of the detection channel 210, a continuous fluid still flows through the detection channel 210, and the detection thermal flight time and the calorimetric sensing element 310 correspondingly measure the continuous fluid to obtain a volume flow and a mass flow of the fluid, thereby enhancing the detection sensitivity of the detection thermal flight time and the calorimetric sensing element 310 on the low reynolds number fluid, and achieving a larger dynamic measurement range.
Specifically, in the present embodiment, as shown in fig. 5, the first port 211 of the detection channel 210 is higher than the second port 212 of the detection channel 210, and the detection channel 210 is inclined from the first port 211 to the second port 212 in the downstream direction of the fluid along the flow direction of the fluid in the pipe body 100. Particulate matters in the fluid are mostly located in the lower area of the flow channel under the influence of gravity, the first port 211 of the detection channel 210 is located above and close to the front end of the vortex street generator 200, and the second port 212 of the detection channel 210 is located below and close to the rear end of the vortex street generator 200, so that the detection time and the pollution caused by the heat sensing element 310 by the intrusion of impurities in the fluid into the detection channel 210 are effectively reduced, and accordingly, the composite vortex street flowmeter has the anti-pollution capability. Certainly, the thermal sensing element 310 for detecting thermal flight time and calorimetric sensing is made by adopting MEMS thermal flight time and calorimetric sensing, when the thermal conductivity of impurities in fluid is poor, the thermal modulation signal of the thermal sensing element 310 for detecting thermal flight time is less affected by impurity contamination, and the measurement function can still be maintained. Preferably, the control unit 700 of the composite vortex shedding flowmeter may be connected to an alarm unit, and when the impurity in the fluid has a great influence on the detection accuracy of the detection of the thermal flight time and the pollution caused by the calorimetric sensing element 310, the control unit 700 may control to turn on the alarm unit according to the detection of the thermal flight time and the pollution signal transmitted by the calorimetric sensing element 310, and the alarm unit gives an alarm to the outside, so that the trapezoidal user maintains the composite vortex shedding flowmeter.
Specifically, the angle between the length direction of the detection channel 210 and the flow direction of the fluid may be 60 ° to 120 °.
Alternatively, in the present embodiment, the thermal flight time detection and calorimetric sensing element 310 may be disposed on a sidewall of the detection channel 210. The influence of the thermal flight time detection and the influence of the calorimetric sensing element 310 on the fluid measurement by the environmental vibration are small, so that the detection accuracy of the thermal flight time detection and the detection accuracy of the calorimetric sensing element 310 on various physical parameters of the fluid are improved, and the detection accuracy of the composite vortex shedding flowmeter is correspondingly further improved.
Specifically, in this embodiment, as shown in fig. 5, the vortex street generator 200 may be trapezoidal, and the size of the front end of the vortex street generator 200 is 0.18 to 0.22 times the inner diameter of the pipe 100. The shape and size of the vortex street generator 200 directly determine the stability of generating vortex street in the fluid, in the conventional vortex street flowmeter, in order to obtain stable vortex street in the pipe body 100, the front section size of the trapezoidal vortex street generator 200 is generally designed to be 0.281 times of the inner diameter of the pipe body 100, but the composite vortex street flowmeter of the present application can detect the volume flow and the mass flow of the fluid in a non-vortex generating state, so that the size requirement on the vortex street generator 200 is small, the front section size of the vortex street generator 200 is set to be 0.18-0.22 times of the inner diameter of the pipe body 100, on the basis of realizing the detection of the composite vortex street flowmeter on the large dynamic range flow, the volume of the vortex street generator 200 can be reduced, and the pressure loss of the vortex street generator 200 on the fluid in the pipe body 100 is reduced. Specifically, the composite vortex shedding flowmeter of the present application has a full range pressure loss of 3/4 to 1/2, preferably 1/2, of the existing conventional vortex shedding flowmeter.
In addition, when the vortex street generator 200 is trapezoidal, the larger side of the vortex street generator 200 serves as the front end face, the transverse dimension of the front end face is larger than that of the tail end, and in the process that particulate matters flow through the vortex street generator 200, the particulate matters are blocked by the front end face of the vortex street generator 200 and are difficult to reach the inlet of the detection channel 210, so that the pollution resistance of the vortex street flowmeter is further improved, and the detection accuracy of the thermal flight time and the detection accuracy of the thermal sensor 310 on each physical parameter of the fluid are correspondingly further ensured.
Optionally, in this embodiment, as shown in fig. 1 to fig. 3, the composite vortex shedding flowmeter may further include a meter head 500 and a connection assembly 400, the connection assembly 400 is connected between the pipe body 100 and the meter head 500, an installation cavity 510 is arranged in the meter head 500, and the control unit 700 is accommodated in the installation cavity 510; the display unit includes a display 600, and the display 600 is mounted to a port of the mounting chamber 510. Here, it is a specific form of the composite vortex shedding flowmeter, wherein, the meter head 500 can accommodate the control unit 700 and the display 600, and has fixed positions and plays a role of protection, thereby improving the stability of the control unit 700 and the display 600; in addition, coupling assembling 400 is connected body 100 and gauge outfit 500 as an organic whole, makes it constitute a complete and independent flow metering device, and vortex flowmeter's transportation, storage and use are all comparatively convenient. Preferably, a battery can be installed in the meter head 500 or the connection assembly 400, and the battery is connected with the detection assembly 300, the control assembly and the display 600 to supply power to the detection assembly, so that when the vortex street flowmeter is used, data safety can be guaranteed, the vortex street flowmeter is not limited by the position of an external power supply, and the use convenience is higher. Specifically, the pipe body 100 may be made of metal or engineering plastic, and an end of the pipe body 100 may be provided with a flange or a threaded section for connecting with a pipeline; the connection assembly 400 can be connected to the tube 100 and the watch head 500 by screws 420.
Specifically, in this embodiment, as shown in fig. 3, an industrial interface circuit board 800 may be further installed in the meter head 500, and the industrial interface circuit board 800 is electrically connected to the control unit 700 and the display unit. The industrial interface circuit board 800 includes various types of wired or wireless conventional interfaces or customer-specific interfaces to improve the functionality of the vortex shedding flowmeter. Preferably, the front end of the watch head 500 may be covered with a front cover 520 with a window, and a front sealing ring 530 is disposed between the front cover 520 and the front end of the watch head 500, so that the display 600 can display through the window; the back end of the watch head 500 can be covered with a back cover 550, and a back sealing ring 540 is arranged between the back cover 550 and the back end of the watch head 500, so that the front cover 520, the front sealing ring 530, the back cover 550 and the back sealing ring 540 can jointly seal the mounting cavity 510 into an approximately sealed cavity, and damage to control elements, display elements and the like in the mounting cavity 510 caused by environmental factors can be reduced. Specifically, when the industrial interface circuit board 800 is in a wired form, the output line thereof may be sealed and plugged by the plug 560.
Specifically, in the present embodiment, as shown in fig. 3, the detection assembly 300 and the control unit 700 may be connected by a signal connector 900, and the signal connector 900 is made of a high temperature insulation material. When the vortex shedding flowmeter is used for metering high-temperature steam, the signal connecting piece 900 can block the influence of heat conduction on the working condition of the control unit 700 on the basis of realizing the electric connection of the detection assembly 300 and the control unit 700, thereby ensuring the normal operation of the control unit 700 and correspondingly ensuring the normal use of the vortex shedding flowmeter. Specifically, the signal connector 900 may be made of high temperature ceramic.
In this embodiment, as shown in fig. 2 and 3, the connection assembly 400 may include a heat insulation sleeve 410, wherein the heat insulation sleeve 410 is connected between the tube 100 and the meter head 500, and the signal connector 900 and the portion of the detection assembly 300 extending out of the tube 100 are covered therein. The heat insulation sleeve 410 is covered outside the signal connector 900 and the detection assembly 300, and can insulate heat when the vortex shedding flowmeter is used for high-temperature measurement, so that the normal operation of the control unit 700 is ensured. Of course, in some embodiments, the connection assembly 400 may be provided without the insulating sleeve 410, as shown in FIG. 1, when the vortex shedding flowmeter is used only for measurements of ambient or cryogenic fluids.
Alternatively, in this embodiment, as shown in fig. 3, a flow field rectifier 110 and a flow field rectifier 120 may be disposed at the fluid inlet end of the tube body 100. The flow field rectifier 110 and the flow field rectifier 120 are arranged to provide a stable flow field for the fluid to be detected, so as to improve the stability of the fluid flowing in the pipe body 100, and correspondingly improve the stability and accuracy of the vortex shedding flowmeter in measuring the fluid.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (11)
1. A composite vortex shedding flowmeter is characterized by comprising a flowmeter main body unit (10), a control unit (700) and a display unit, the flowmeter main body unit (10) comprises a pipe body (100), a vortex street generator (200) and a detection assembly (300), the vortex street generator (200) is arranged in the pipe body (100), the vortex street generator (200) is provided with a detection channel (210), the detection assembly (300) is arranged in the pipe body (100), and the detection thermal flight time and the thermal sensing element (310) of the detection assembly (300) are located within the detection channel (210), the element (310) for detecting the hot flight time and the calorimetric sensing is composed of a first temperature sensor (313), a micro heat source sensor (314), a second temperature sensor (315) and an environment temperature sensor (316), which are sequentially arranged on a detection surface of a silicon substrate (311) at intervals;
the thermal time-of-flight and calorimetric sensing elements (310) are deposited on a thin film (312) over a thermally insulated cavity of the silicon substrate (311);
the thermal time-of-flight and calorimetric sensing element (310) and the display unit are both connected to the control unit (700).
2. The composite vortex shedding flowmeter of claim 1, wherein the detection channel (210) is linear, and the length direction of the detection channel (210) is arranged at an angle to the horizontal.
3. The composite vortex street flowmeter according to claim 2, wherein the first port (211) of the detection channel (210) is higher than the second port (212) of the detection channel (210), and the detection channel (210) is inclined in a downstream direction of the fluid from the first port (211) to the second port (212) in a flow direction of the fluid in the pipe body (100).
4. The composite vortex shedding flowmeter of claim 3, wherein the angle between the lengthwise direction of the detection channel (210) and the flow direction of the fluid is 60 ° to 120 °.
5. The composite vortex street flowmeter according to any one of claims 1-4, wherein the vortex street generator (200) has a trapezoidal shape, and the height of the vortex street generator (200) is 0.18-0.22 times the inner diameter of the pipe body (100).
6. The composite vortex shedding flowmeter according to any one of claims 1-4, wherein the thermal time of flight and calorimetric sensing elements (310) are provided on the side wall of the detection channel (210).
7. The composite vortex shedding flowmeter according to any one of claims 1-4, wherein the dynamic range that the composite vortex shedding flowmeter can measure is 100:1 to 300: 1.
8. The composite vortex street flowmeter according to any of the claims 1-4, wherein the fluid inlet end of the pipe body (100) is provided with a flow field rectifier (110) and a flow field rectifier (120).
9. The composite vortex street flowmeter according to any one of claims 1-4, wherein the composite vortex street flowmeter further comprises a meter head (500) and a connecting assembly (400), wherein the connecting assembly (400) is connected between the pipe body (100) and the meter head (500), a mounting cavity (510) is arranged in the meter head (500), and the control unit (700) is accommodated in the mounting cavity (510); the display unit comprises a display (600), and the display (600) is installed at a port of the installation cavity (510).
10. The composite vortex street flowmeter according to claim 9, wherein the detection assembly (300) is connected to the control unit (700) by a signal connector (900), and the signal connector (900) is made of a high temperature insulating material.
11. The composite vortex shedding flowmeter of claim 10, wherein the connecting assembly (400) comprises a heat insulating sleeve (410), wherein the heat insulating sleeve (410) is connected between the pipe body (100) and the meter head (500) and covers the signal connector (900) and the part of the detecting assembly (300) extending out of the pipe body (100).
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| CN202110175338.0A CN113029257A (en) | 2021-02-09 | 2021-02-09 | Composite vortex street flowmeter |
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