CN113049848A - Portable current meter based on numerical simulation and pressure sensor - Google Patents
Portable current meter based on numerical simulation and pressure sensor Download PDFInfo
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- CN113049848A CN113049848A CN202110349961.3A CN202110349961A CN113049848A CN 113049848 A CN113049848 A CN 113049848A CN 202110349961 A CN202110349961 A CN 202110349961A CN 113049848 A CN113049848 A CN 113049848A
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- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/02—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring forces exerted by the fluid on solid bodies, e.g. anemometer
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Abstract
The invention provides a portable current meter based on numerical simulation and a pressure sensor, which comprises a current sensing device, wherein the current sensing device comprises a first cone serving as a flow-receiving part and a second cone serving as a back flow part, the bottoms of the first cone and the second cone are buckled, and the first cone and the second cone are the same in size and material; the flow velocity sensing device is obtained based on Fluent numerical simulation; amplifying the pressure output by the flow velocity sensing device through the pressure transmission device and transmitting the pressure to the pressure sensing device; the pressure sensing device is used for receiving the pressure signal transmitted by the pressure transmission device and converting the pressure signal into a resistance signal; the resistance measuring circuit converts a resistance signal of the pressure sensing device into a voltage signal and the voltage signal is visually output by the digital voltmeter; the current meter of the invention can directly measure the instantaneous current and ensure higher measurement precision, has adjustable lever coefficient, can furthest enlarge the measuring range of the current meter, and has small volume, small mass and convenient carrying.
Description
Technical Field
The invention relates to the technical field of flow velocity detection, in particular to a portable flow velocity meter based on numerical simulation and a pressure sensor.
Background
The existing flow velocity meters and flow velocity measurement technologies are various, but most of the existing flow velocity meters and flow velocity measurement technologies are used for giving average flow velocity in a process by calculating and analyzing a certain physical process of fluid. It is difficult to perform measurement in a case where the fluid flow rate fluctuation frequency is large and the instantaneous demand for flow rate measurement is high.
The existing acoustic current meter used in scientific research work is complex in device and operation and inconvenient to carry; the most common rotor type current meter in the market has high cost, and causes great limitation to the current measurement of daily life and investigation work.
The pressure sensor current meter in the prior art has low measurement precision, is difficult to measure low-speed water flow and is difficult to accurately measure high-speed water flow.
Disclosure of Invention
The invention aims to provide a portable current meter based on numerical simulation and a pressure sensor, which can directly measure the instantaneous current, ensure higher measurement precision, and has adjustable lever coefficient, thereby furthest amplifying the measuring range of the current meter.
The embodiment of the invention provides a portable current meter based on numerical simulation and a pressure sensor, which comprises:
the flow velocity sensing device comprises a first cone as an incident flow part and a second cone as a back flow part, wherein the bottoms of the first cone and the second cone are buckled, and the first cone and the second cone are the same in size and material; the flow velocity sensing device is obtained based on Fluent numerical simulation;
the pressure transmission device amplifies the pressure output by the flow velocity sensing device and transmits the pressure to the pressure sensing device;
the pressure sensing device is used for receiving the pressure signal transmitted by the pressure transmission device and converting the pressure signal into a resistance signal;
and the resistance measuring circuit converts a resistance signal of the pressure sensing device into a voltage signal and the voltage signal is visually output by the digital voltmeter.
Optionally, when the flow velocity sensing device is in water, a connecting line of vertexes of the two cones is consistent with the direction of water flow, and the incident flow part receives collision of the water flow.
Optionally, the pressure transfer device comprises:
the underwater transmission rod is connected with the flow velocity sensing device;
one end of the water transfer rod is connected with the underwater transfer rod;
the gear shifting assembly is used for switching between a high gear and a low gear;
and the pressure part comprises a first rod connected with one end of the waterborne transfer rod and a second rod transversely connected with the first rod.
Optionally, the shift assembly comprises:
the bearing is arranged on the bottom plate;
the water transfer rod is inserted into the bearing through the through hole of the fixing needle and is fixed through the steel ball.
Optionally, the pressure transfer device further comprises:
and a sensor protection part disposed at both ends of the second rod.
Optionally, the pressure transfer device is a membrane pressure sensor.
Optionally, the voltage output device includes:
a resistance measuring circuit, a circuit box, a circuit switch and a digital voltmeter,
the circuit box is a closed plastic square box, most of wires, circuit switches and a digital voltmeter which are contained in the resistance measuring circuit are arranged outside the circuit box, and the circuit box can slide up and down through a slide way on the bottom plate.
Optionally, the resistance measurement circuit comprises:
a power supply, a fixed value resistor, a film pressure sensor and a voltmeter,
the constant value resistor is connected with the voltmeter in parallel and then connected with the film pressure sensor in series, and the power supply comprises a voltage boosting conversion module.
Optionally, the flow meter further comprises:
and the fixing assembly comprises three rotatable triangular bodies which are arranged on the bottom plate at equal intervals, and the three rotatable triangular bodies play a role in pair to fix the circuit box and keep the film pressure sensor in contact with the second rod.
Optionally, the flow meter further comprises:
the bubble ball is a transparent glass bubble which contains small bubbles, and when the position of the flow velocity instrument is properly arranged, the small bubbles are positioned at the top of the glass ball, so that the proper position of the flow velocity instrument is adjusted;
and the bracket is adjusted according to the indication of the water bubble ball.
Advantageous effects
The invention provides a portable current meter based on numerical simulation and a pressure sensor, which comprises a current sensing device, a current sensing device and a current sensing device, wherein the current sensing device comprises a first cone serving as a current-receiving part and a second cone serving as a back current part, the bottoms of the first cone and the second cone are buckled, and the first cone and the second cone are the same in size and material; the flow velocity sensing device is obtained based on Fluent numerical simulation; amplifying the pressure output by the flow velocity sensing device through the pressure transmission device and transmitting the pressure to the pressure sensing device; the pressure sensing device is used for receiving the pressure signal transmitted by the pressure transmission device and converting the pressure signal into a resistance signal; the resistance measuring circuit converts a resistance signal of the pressure sensing device into a voltage signal and the voltage signal is visually output by the digital voltmeter. The device can directly measure the instantaneous flow velocity, ensures higher measurement precision, has adjustable lever coefficient, amplifies the measuring range of the flow velocity meter to the maximum extent, and has small volume, small mass and convenient carrying.
Drawings
In order to more clearly illustrate one or more embodiments or prior art solutions of the present specification, the drawings that are needed in the description of the embodiments or prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present specification, and that other drawings can be obtained by those skilled in the art without inventive exercise.
Fig. 1 is a schematic structural diagram of a flow rate sensing device in a portable flow meter based on numerical simulation and a pressure sensor according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a pressure transmission device in a portable flow meter based on numerical simulation and a pressure sensor according to an embodiment of the present invention;
FIG. 3 is a front view of a pressure transmitting device in a portable flow meter based on numerical simulation and a pressure sensor according to an embodiment of the present invention;
FIG. 4 is a right side view of a pressure transmitting device in a portable flow meter based on numerical simulation and a pressure sensor in accordance with an embodiment of the present invention;
fig. 5 is a schematic perspective view of a portable flow meter based on numerical simulation and a pressure sensor according to an embodiment of the present invention;
FIG. 6 is a left side view and a right side view of a portable flow meter based on numerical simulation and pressure sensors in accordance with an embodiment of the present invention;
FIG. 7 is a resistance measuring circuit diagram of a voltage output device of a portable current meter based on numerical simulation and a pressure sensor according to an embodiment of the present invention;
fig. 8 is a schematic perspective view of a portable flow meter based on numerical simulation and a pressure sensor according to an embodiment of the present invention.
In the figure: 1. a flow rate sensing device; 2. an underwater transfer rod; 3. an overwater transfer rod; 4. a fixing pin; 5. a steel ball; 8. a bearing; 9; a pressure applying device; 91. a first lever; 92. a second lever; 10. a sensor protection device; 12. a circuit box; 13. a circuit switch; 14. a slideway; 15. a circuit box fixing device; 16. a base plate; 17. Soaking the balls in water; 18. a digital voltmeter; 19. a first bracket connection device; 20. a second bracket connection means 2; 21, a bracket.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The main principle of the invention is that three steps of converting flow rate into pressure, converting pressure into electric signal and outputting the electric signal are carried out, the conversion of flow rate into pressure is based on a numerical simulation technology, a specific tool used is Fluent, and the specific principle is numerical simulation solution of a motion equation of viscous fluid (hereinafter referred to as an N-S equation). The method comprises the steps of establishing a grid of an engineering model by means of an electronic computer and combining a finite element concept, dividing the grid into a plurality of small areas which can be solved by the computer, respectively carrying out iterative operation solving on required physical quantities in each area, and then calculating the whole physical quantity formed by the small areas to achieve the purpose of researching engineering problems and physical problems.
The tool for numerical simulation is Fluent, which solves the problem by means of a physical model, a numerical method and a pre-and post-processing function. The magnitude of the pressure applied by the fluid to the 'sensing object' under different flow rates is simulated under a plurality of working conditions and is fitted into a functional relation, so that the flow rate-pressure relation can be obtained. The material and shape of the sensing object need to be comprehensively selected through a plurality of simulation experiments and actual measurement experiments.
The invention will be further described with reference to the following description and specific examples, taken in conjunction with the accompanying drawings:
the embodiment of the invention provides a portable current meter based on numerical simulation and a pressure sensor, which comprises:
the flow velocity sensing device comprises a first cone as an incident flow part and a second cone as a back flow part, wherein the bottoms of the first cone and the second cone are buckled, and the first cone and the second cone are the same in size and material; the flow velocity sensing device is obtained based on Fluent numerical simulation; it should be noted that the flow rate sensing device may be integrally formed;
the pressure transmission device amplifies the pressure output by the flow velocity sensing device and transmits the pressure to the pressure sensing device;
the pressure sensing device is used for receiving the pressure signal transmitted by the pressure transmission device and converting the pressure signal into a resistance signal;
and the resistance measuring circuit converts a resistance signal of the pressure sensing device into a voltage signal and the voltage signal is visually output by the digital voltmeter.
The embodiment provides a portable current meter based on numerical simulation and a pressure sensor, which comprises a current sensing device, a current sensing device and a control device, wherein the current sensing device comprises a first cone serving as a current-receiving part and a second cone serving as a back current part, the bottoms of the first cone and the second cone are buckled, and the first cone and the second cone are the same in size and material; the flow velocity sensing device is obtained based on Fluent numerical simulation; amplifying the pressure output by the flow velocity sensing device through the pressure transmission device and transmitting the pressure to the pressure sensing device; the pressure sensing device is used for receiving the pressure signal transmitted by the pressure transmission device and converting the pressure signal into a resistance signal; the resistance measuring circuit converts a resistance signal of the pressure sensing device into a voltage signal and the voltage signal is visually output by the digital voltmeter. The device can directly measure the instantaneous flow velocity, ensures higher measurement precision, has adjustable lever coefficient, amplifies the measuring range of the flow velocity meter to the maximum extent, and has small volume, small mass and convenient carrying.
Specifically, the flow velocity sensing means, i.e., means for sensing the impact of the fluid in the water and transmitting the pressure given by the fluid to the next portion; it should be noted that, the flow state of the fluid is two kinds of laminar flow and turbulent flow, and laminar flow fluid rushes to a certain object, and there is a possibility that turbulent flow with more complicated and error calculation principle is formed behind the laminar flow fluid.
Specifically, in one embodiment, as shown in fig. 1, the double-cone flow velocity sensing device is composed of an incident flow part in the left half and a back flow part in the right half, and both of the two parts have the same shape and material, and are cones with a radius r of 0.5mm and a height h of 10 mm. In water, the connecting line of the vertexes of the two cones is consistent with the direction of water flow, and the incident flow part receives the impact of the water flow. It should be noted that the above dimensions are only a preferred embodiment, and the specific dimensions are not limited;
in this embodiment, the pressure of water received by the conical biconical flow rate sensing device with a radius r of 0.5mm at the bottom and a height h of 10mm is denoted as F1The flow rate of the fluid to be measured before contact is denoted v, F1There is a functional relationship with v.
The double-cone model is placed in fluid, and because the conical surfaces on the two sides are in contact with the fluid, the pressure applied to the double-cone model is the difference between the pressures on the two sides, namely:
p＝pfrontside-pbackside
and the double cones are symmetrical on two sides, and the hydrostatic pressure is zero.
The dynamic fluid pressure is calculated by solving a momentum equation, namely:
wherein the content of the first and second substances,
is the external force applied to the fluid, rho is the density of the fluid, Q is the flow rate of the fluid, v1，v2Is the average velocity of fluid at the beginning and end of the state, beta1，β2Is a momentum correction factor;
dividing the stressed curved surface into a plurality of infinitesimal, writing a momentum equation in an N-S equation form, calculating the stress of each infinitesimal by program simulation, summing to obtain the pressure stressed by each curved surface, and obtaining the dynamic fluid pressure stressed by the double-cone model by the force difference of the two surfaces.
Specifically, F1The concrete process of the v functional relationship analysis is as follows:
by the Fluent analysis method, assuming that the fluid is a near-aqueous fluid, the density ρ is 1000kg/m3, the viscosity coefficient μ is 1.0087cP, and the flow velocity v (0.1 m/s. ltoreq. v.ltoreq.10 m/s).
1) Meshing: the calculation domain is divided by adopting standard unstructured tetrahedral meshes, the part near the wall is encrypted, the part far from the wall is relatively sparse, and the area near the spindle is further encrypted with meshes, so that the total division amount of the biconical meshes is 1500000 for ensuring higher accuracy.
2) Setting numerical method: the whole calculation domain is a rectangular region of 160mmx80mm, the left side and the upper and lower sides of the flow field are both set as velocity-entrance boundaries (velocity-inlets), the right side of the flow field is set as pressure-exit boundaries (pressure-exit), and the surfaces of the projectiles are all non-slip wall surfaces. The calculation model is a single-phase flow calculation, so that a single-phase model calculation is adopted. In the turbulent flow state, the turbulent flow state of each boundary variable is required to be set, a k-e turbulent flow model is adopted in calculation, and the turbulent flow intensity and the turbulent flow viscosity ratio are required to be set, wherein the turbulent flow intensity at the inlet and the turbulent flow viscosity ratio at the outlet are set to be 0.5, and the turbulent flow viscosity ratio is set to be 1. And adjusting the size of the relaxation factor in FLUENT to facilitate convergence of the calculation result. In order to be suitable for the flow calculation with large Reynolds number, the PRESTO method is adopted for pressure variable interpolation, the SIMPLIC method is adopted for pressure velocity coupling, and the first-order windward format is adopted for momentum, volume ratio, k and e dispersion.
3) Numerical simulation: the flow velocity of the input external flow field is 0.1m/s,0.2m/s,0.3m/s, … … and 10m/s (total 100 groups). The simulation experiment calculates and outputs the total resistance of the force-facing surface and the back flow surface of the biconical model, records and fits the experiment result, and the relation of the flow velocity and the pressure is obtained as follows:
during numerical simulation, the laminar flow scene is directly simulated by using an N-S model provided by Fluent, the turbulent flow scene is simulated by using a k-e model, and the related parameters are optimally selected. The double-cone model is placed in the fluid, and because the conical surfaces on the two sides are contacted with the fluid, the pressure applied to the double-cone model is the difference between the pressures on the two sides. Therefore, the pressure borne by the double-cone model can be obtained under the conditions of given parameters and fluid flow rate.
Analyzing under different working conditions by using Fluent to obtain a flow velocity-pressure corresponding relation, and fitting to obtain a flow velocity-pressure functional relation. After the working condition is analyzed and the result is fitted, the flow velocity-pressure relation is obtained as follows:
it should be noted that, in the above embodiments, the specification setting of the double-cone model is a preferred embodiment with higher accuracy of the result in the present situation, and the specific parameter setting may also be adjusted in actual need.
When the flow velocity sensing device is in water, the connecting line of the vertexes of the two cones is consistent with the direction of water flow, and the incident flow part receives the impact of the water flow.
Fig. 2-4 show a schematic perspective view, a front view and a right view of a flow rate sensing device of a portable flow meter based on numerical simulation and a pressure sensor according to an embodiment of the present invention. Fig. 5 is a schematic perspective view illustrating a portable flow meter based on numerical simulation and pressure sensor according to an embodiment of the present invention, and fig. 6 is a left and right side views illustrating a portable flow meter based on numerical simulation and pressure sensor according to an embodiment of the present invention, and specifically, as shown in fig. 2 to 6, the pressure transmission device includes:
the underwater transmission rod 2 is connected with the flow velocity sensing device; the underwater transmission rod 2 is a part which is allowed to be submerged in the pressure transmission device, for example, the underwater transmission rod can be a rectangular plastic sheet, and the double-cone flow velocity sensing device 1 is connected to the lower part of the underwater transmission rod, so that on the premise that the underwater transmission rod 2 is not easy to bend, the underwater transmission rod can meet the flow with the minimum area, the interference of the underwater transmission rod to a fluid field is reduced, and the length of the underwater transmission rod also determines the maximum depth of the flow velocity meter for allowing the speed.
One end of the water transfer rod 3 is connected with the underwater transfer rod 2; the water transfer rod is a part of the pressure transfer device which is not allowed to be submerged, and can be a cylindrical plastic body, for example, and the lower part of the water transfer rod is connected to the underwater transfer rod 2.
The gear shifting assembly is used for switching between a high gear and a low gear; for example, the shift assembly includes:
a bearing 8 provided on the bottom plate 16; fixed needle 4 to and the steel ball 5 of one side fretwork, transmission rod 3 on water inserts through fixed needle 4 perforation bearing 8, fixed needle 4 can rotate at will in the bearing, and can pass through steel ball 5 is fixed. The fixed needle 4 serves as a fulcrum of the entire pressure transmission device. The ratio of the power arm length to the resistance arm length of the lever is a lever coefficient, when the low-speed gear conversion device operates, the lever coefficient is large, and the flow velocity meter can measure the flow velocity of low-speed fluid. When the high-speed gear conversion device operates, the lever coefficient is small, and the flow velocity meter can measure the flow velocity of high-speed fluid. The bearing 8 is used for fixing the whole pressure transmission device, reducing friction loss to the maximum extent and assisting the lever fulcrum action of the fixing needle 4.
Specifically, in one embodiment, the pressing portion 9 includes a first rod 91 connected to one end of the water transfer rod, and a second rod 92 transversely disposed to connect the first rod. The pressure applying part 9 is the tail end of the pressure transmission device, and the pressure signal is amplified and transmitted to the pressure sensing device through the pressure applying part.
Specifically, in one embodiment, the pressure transfer device further comprises:
and a sensor protection unit 10 disposed at both ends of the second rod 92. The sensor protection device can be a square plastic block, for example, two blocks are welded at the left end and the right end of the pressing part 9 respectively, so that the sensor is protected, and damage caused by overlarge pressure intensity when the pressing part 9 transmits the pressure to the pressure sensing device is avoided.
In particular, in one embodiment, the pressure transfer device is a membrane pressure sensor. The film pressure sensor has the selection conditions of high sensitivity, high precision and wide range.
Preferably, the membrane pressure sensor is of the type RP-C7.6LT-LF2, measuring in the range of 2g-1500g, and in combination with a pressure transmitting device, is capable of measuring fluid flow rates in most situations. Depending on the selected gauge of the diaphragm pressure sensor, the optimum gauge of the pressure transfer device may be determined.
Specifically, in one embodiment, the voltage output device includes:
the resistance measuring circuit, the circuit box 12, the circuit switch 13 and the digital voltmeter 18;
the voltage output device, namely the matched resistance measuring circuit of the pressure sensing device, converts the resistance signal of the film pressure sensor into voltage and is visually output by a digital voltmeter, and the circuit box can be a closed plastic square box, for example, and most of wires in the resistance measuring circuit are contained, and the film pressure sensor 11 is adhered to the left side of the power supply; the circuit switch 13 and the digital voltmeter 18 are arranged outside the circuit box 12, so that the circuit is controlled and the voltage value is read conveniently. The circuit box can slide up and down through the slide 14 on the base plate 16. For example, the circuit box slide may be composed of two rows of metal slides, which are engaged with the circuit box 12 and allow the circuit box 12 to slide thereon, so as to ensure that the film pressure sensor 11 is always in contact with the sensor protection device 10 to receive the pressure from the pressure transmission device when the low/high speed gear shifting device is operated.
Specifically, in one embodiment, as shown in fig. 7, the resistance measurement circuit includes:
power supply, constant value resistor R1Film pressure sensor RfA voltage meter V,
the constant value resistor R1Is connected with the film pressure sensor R after being connected with the voltmeter V in parallelfAnd the power supply comprises a voltage boost conversion module.
The advantageous effects of the present invention are explained below with a preferred embodiment;
film pressure sensor R of the present embodimentfThe model is RP-C7.6LT-LF2, and the resistance measuring circuit comprises the following components: 2 section 18650 lithium cell and 12V voltage boost conversion module provide the electric current as the power, and the electric current flows through the circuit switch (key) that establishes ties in proper order, 2000 omega definite value resistance, film pressure sensor and returns to the power, and digital voltmeter connects in parallel with 2000 omega definite value resistance, measures its both ends voltage.
Wherein 2-section 18650 lithium batteries and 12V voltage boost conversion module form the power, the voltmeter is the digital voltmeter of higher accuracy, R1Constant value resistance of 2000 omega, RfIs a membrane pressure sensor.
The circuit is connected, digital voltage representation numbers under given pressure are measured through experiments, corresponding values of 50 groups of pressure and voltage are obtained, and a pressure-voltage function relation obtained through fitting is as follows:
the physical quantity of the pressure is transmitted by the amplification of the pressure transmission device, so the pressure in the flow rate-pressure function and the pressure-voltage function does not have the same meaning, and the flow rate-pressure function and the pressure-voltage function have the relation of multiple of the lever coefficient.
Combining the flow velocity-pressure function relation measured by a mechanical device experiment, the specification of the pressure transfer device and the pressure-voltage function relation, obtaining the direct relation between the flow velocity to be measured and the voltage:
the low gear flow rate and the high gear flow rate are respectively as follows:
in this embodiment, the high-speed lever coefficient λ is 1, the low-speed lever coefficient λ is 59, and the specific specification of the current meter of this embodiment is:
the double-cone flow velocity sensing device 1 is characterized in that the radius of each cone is 5mm, and the height of each cone is 10 mm;
the underwater transmission rod 2 is 125mm in length, 5mm in width and 0.8mm in thickness;
the length of the waterborne transfer rod 3 is 167.5mm, and the radius of the bottom circle is 2.5 mm;
the distance from the connecting point of the high gear and the water transfer rod 3 to the lower end of the water transfer rod 3 is 20 mm;
the distance from the connecting point of the low gear and the overwater transmission rod 3 to the upper end of the low gear 3 is 2.5 mm;
the length of the first rod 91 is 2.5 mm;
the second lever 92 has a length of 5 mm.
Specifically, in this embodiment, the flow meter further includes:
the fixing assembly includes three rotatable triangular bodies 15 arranged at equal intervals on the bottom plate, and two of the three rotatable triangular bodies are used for fixing the circuit box 12 and keeping the film pressure sensor 11 in contact with the second rod 92.
Specifically, in this embodiment, as shown in fig. 8, the flow meter further includes:
the bubble ball 17 is a transparent glass bubble which contains small bubbles, and when the position of the flow velocity instrument is properly arranged, the small bubbles are positioned at the top of the glass ball, so that the proper position of the flow velocity instrument is adjusted;
the first bracket connecting device 19 is a metal ball with a hollow upper part, and the first bracket connecting device 19 is a metal ball with a hollow upper part; the first bracket connecting device 19 is used for connecting a bracket 21;
specifically, the bracket 21 includes a rod body and a second bracket connecting device 20;
the second bracket connecting device 20 is composed of two arc-shaped hollow metal balls and two metal rods in a hinge mode, the directions of rotation allowed by the two hinges are mutually vertical, so that the whole omnibearing rotation is achieved, the arc-shaped hollow metal balls are connected to the rods in the hinge mode, and the rods below can be inserted into the first bracket connecting device 19;
in this embodiment, the rack may be composed of four identical parts, which are respectively connected to the second rack connecting means 20, and the second rack connecting means 20 is hinged to the arc-shaped hollow glass ball by two telescopic metal rods. The second bracket connecting device 20 and the bracket 21 are not needed under the general flow velocity measurement condition, and when the measurement process is long or the area of the water area to be measured is large and the measurement is inconvenient by holding the flow velocity meter, the second bracket connecting device 20 and the bracket 21 are used.
In conclusion, the beneficial technical effects of the invention are as follows:
1. convenient operation, carry and remove:
the flow meter is very simple and convenient to operate, the switch is opened only → the biconical cone is immersed in the fluid to be measured → the water bubble ball is adjusted → the conversion of the reading is carried out, a large amount of time is saved for measuring the flow rate, and the flow rate of a plurality of places or the flow rate of a plurality of time points is continuously measured without zero adjustment and can be directly used; the flow velocity instrument has small volume, small mass and convenient carrying.
2. High sensitivity and high precision:
the sensitivity and accuracy of the selected RP-C7.6LT-LF2 film pressure sensor are high, and the sensitivity and accuracy are improved by multiple times by the aid of the pressure transmission device to amplify pressure. In addition, the double-cone flow velocity sensing device and the incident surface of the underwater transmission rod are small, the influence of the device on a fluid field is reduced to a great extent, and the measurement accuracy is higher.
3. The measuring range is large:
the designed pressure transmission device comprises a lever capable of controlling the conversion of a low gear and a high gear, the flow range is 0.1243m/s-9.8497m/s under the displayed specification, and in actual production and application, the specification of the pressure transmission device can be readjusted according to actual requirements to change the flow range.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A portable flowmeter based on numerical simulation and a pressure sensor, said tube flowmeter comprising:
the flow velocity sensing device comprises a first cone as an incident flow part and a second cone as a back flow part, wherein the bottoms of the first cone and the second cone are buckled, and the first cone and the second cone are the same in size and material; the flow velocity sensing device is obtained based on Fluent numerical simulation;
the pressure transmission device amplifies the pressure output by the flow velocity sensing device and transmits the pressure to the pressure sensing device;
the pressure sensing device is used for receiving the pressure signal transmitted by the pressure transmission device and converting the pressure signal into a resistance signal;
and the resistance measuring circuit converts a resistance signal of the pressure sensing device into a voltage signal and the voltage signal is visually output by the digital voltmeter.
2. The flowmeter of claim 1, wherein when the flow velocity sensor is in water, the connecting line of the two conical vertexes is consistent with the water flow direction, and the incident flow part receives the impact of the water flow.
3. The flow meter according to claim 1, wherein the pressure transfer device comprises:
the underwater transmission rod is connected with the flow velocity sensing device;
one end of the water transfer rod is connected with the underwater transfer rod;
the gear shifting assembly is used for switching between a high gear and a low gear;
and the pressure part comprises a first rod connected with one end of the waterborne transfer rod and a second rod transversely connected with the first rod.
4. The flow meter of claim 3, wherein the shift assembly comprises:
the bearing is arranged on the bottom plate;
the water transfer rod is inserted into the bearing through the through hole of the fixing needle and is fixed through the steel ball.
5. The flow meter according to claim 3, wherein the pressure transfer device further comprises:
and a sensor protection part disposed at both ends of the second rod.
6. A flow meter according to any of claims 1-5, wherein the pressure transmitting means is a membrane pressure sensor.
7. The flow meter according to any of claims 1 to 5, wherein the voltage output means comprises:
a resistance measuring circuit, a circuit box, a circuit switch and a digital voltmeter,
the circuit box is a closed plastic square box, most of wires, circuit switches and a digital voltmeter which are contained in the resistance measuring circuit are arranged outside the circuit box, and the circuit box can slide up and down through a slide way on the bottom plate.
8. The flow meter according to claim 7, wherein the resistance measurement circuit comprises:
a power supply, a fixed value resistor, a film pressure sensor and a voltmeter,
the constant value resistor is connected with the voltmeter in parallel and then connected with the film pressure sensor in series, and the power supply comprises a voltage boosting conversion module.
9. The flow meter according to any of claims 7, further comprising:
and the fixing assembly comprises three rotatable triangular bodies which are arranged on the bottom plate at equal intervals, and the three rotatable triangular bodies play a role in pair to fix the circuit box and keep the film pressure sensor in contact with the second rod.
10. The flow meter according to any of claims 1-5, further comprising:
the bubble ball is a transparent glass bubble which contains small bubbles, and when the position of the flow velocity instrument is properly arranged, the small bubbles are positioned at the top of the glass ball, so that the proper position of the flow velocity instrument is adjusted;
and the bracket is adjusted according to the indication of the water bubble ball.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115452237A (en) * | 2022-09-16 | 2022-12-09 | 湖南大学 | Novel pipeline liquid pressure testing method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115452237A (en) * | 2022-09-16 | 2022-12-09 | 湖南大学 | Novel pipeline liquid pressure testing method and device |
| CN115452237B (en) * | 2022-09-16 | 2023-08-11 | 湖南大学 | Novel pipeline liquid pressure testing method and device |
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