CN211264710U

CN211264710U - Automatic measurement type experiment teaching device for flow meter cognition and performance correction

Info

Publication number: CN211264710U
Application number: CN202020045952.6U
Authority: CN
Inventors: 杨嵩; 朱先勇; 王辉; 王继利; 姜城; 孙晓敬
Original assignee: Jilin University
Current assignee: Jilin University
Priority date: 2020-01-10
Filing date: 2020-01-10
Publication date: 2020-08-14
Anticipated expiration: 2030-01-10

Abstract

The utility model relates to an automatic measurement type experiment teaching device for flowmeter is cognitive and performance is rectified belongs to the teaching aid field. The centrifugal water pump is arranged at the end foot of the support system, and a standard turbine flowmeter is connected above the centrifugal water pump, a main water supply pipeline is connected above the standard turbine flowmeter, and the rear end of the main water supply pipeline is connected with a water supply system; the system to be tested is arranged in a sub water supply pipeline of the water supply system, the tail end of the water supply system is provided with an automatic metering system, the water storage water tank is arranged at the bottom of the supporting system, the control and power distribution system is arranged at the bottom of the supporting system, and the automatic data acquisition system is positioned above the control and power distribution system. Has the advantages that: the flow meter device has the advantages of simple structure, light volume and high automation degree, can complete teaching work of related hydromechanics experiments such as flow meter cognition, flow meter key performance parameter measurement, flow meter performance correction and the like by two methods of a volume measurement method and a standard flow meter comparison measurement method, and is attractive in appearance, stable, reliable, convenient to use and maintain.

Description

Automatic measurement type experiment teaching device for flow meter cognition and performance correction

Technical Field

The utility model relates to a teaching aid field, in particular to automatic measurement type experiment teaching device that is used for flowmeter cognition and performance to rectify is an automatic measurement type experiment teaching device that is used for flowmeter cognition, key performance parameter measurement and performance to rectify.

Background

In the teaching practice related to fluid mechanics and fluid engineering, the flow rate is an important physical quantity reflecting the flow state of a fluid and is usually used to represent the amount of fluid passing through a specific surface per unit time. The flowmeter is a flow metering device, and is a meter for indicating the measured flow and/or the total amount of fluid in a selected time interval. There are many types of flow meters, including: differential pressure type flow meters, volumetric flow meters, turbine flow meters, electromagnetic flow meters, vortex flow meters, ultrasonic flow meters, coriolis flow meters, and the like. In teaching practice, in order to enable students to know and master related knowledge of classification, form, principle, measurement precision, characteristics, application conditions and the like of common flowmeters in engineering, teaching links of flowmeter cognition, flowmeter key performance parameter measurement and flowmeter correction experiment are designed, the common flowmeters in engineering are displayed to the students, and related measurement work is completed to achieve the teaching purpose of mastering the meter cognition, the measurement principle and the measurement method. In the current experiment teaching link, the current flowmeter correction experiment table can only meet the requirement that students finish the correction of a single flowmeter one by utilizing a volume method through a metering water tank, the correction method lacks standard flow reference, the accuracy of a correction result is low, the automation degree is low, the students have no deep knowledge on the generation reason of experimental errors of the flowmeter, the corresponding change relation of instantaneous flow and instantaneous physical quantity is not easy to observe, the measurement is not enough, and the experiment teaching effect is not good.

Disclosure of Invention

An object of the utility model is to provide an automatic measure type experiment teaching device for flowmeter is cognitive and performance correction has solved the above-mentioned problem that prior art exists. The utility model discloses a structure and uncomplicated has realized the cognition of common kind flowmeter in the engineering, carries out automatic correction to the flowmeter through volumetric measurement method and standard flowmeter comparison measuring method, has improved the precision of correction, and the experimentation is clearly understandable, and the experimental result presents clear accuracy, has improved the quality and the efficiency of teaching.

The above object of the utility model is realized through following technical scheme:

the automatic measurement type experiment teaching device for flowmeter cognition and performance correction comprises a supporting system 1, a water supply system 2, a measured system 3, an automatic metering system 4, a water storage tank 5, a control and power distribution system 6, an automatic data acquisition system 7 and a standard flow metering system 8, wherein a centrifugal water pump 201 of the water supply system 2 is arranged at an end foot of the supporting system 1, a standard turbine flowmeter 801 of the standard flow metering system 8 is connected above the centrifugal water pump, a main water supply pipeline 203 is connected above the standard turbine flowmeter 801, and the rear end of the main water supply pipeline is connected with the water supply system 2; the system 3 to be tested is arranged in a sub water supply pipeline of the water supply system 2, the tail end of the water supply system 2 is provided with an automatic metering system 4 required by a volume measurement method, a water storage tank 5 is arranged at the bottom of the supporting system 1, a control and power distribution system 6 is arranged at the bottom of the supporting system 1, and an automatic data acquisition system 7 is positioned above the control and power distribution system 6.

The supporting system 1 adopts a 45 x 45mm aluminum alloy section frame 101.

The standard turbine flowmeter 801 is connected with the main water supply pipeline 203 in series and is connected with the automatic data acquisition system 7 through a data line, so that the automatic measurement of a standard flowmeter comparison measurement method is realized.

The water supply system 2 is divided into four sub-water supply pipes at the second bending part of the main water supply pipe 203.

The various to-be-measured flow meters in the to-be-measured system 3 are respectively connected with the four sub water supply pipelines in series and can be detached and replaced, wherein the to-be-measured ultrasonic flow meter is fixed at any position of the fourth water supply pipe 207 by the fixing clamping belt 307, so that the comparison experiment of the flow measurement precision of different positions is realized.

The automatic metering system 4 adopts a split structure design, an automatic metering device is arranged in the metering water tank body 402 and is connected with the automatic data acquisition system 7 through a data line, so that the automatic measurement of a volume measurement method is realized, and the metering water tank body 402 and the dustproof cover plate 401 at the top are designed in a separated mode; a gap is formed between the dustproof cover plate 401 and a pipeline at the tail end of the water supply system 2; the water tank contains a liquid buffer 403.

The automatic metering device comprises an automatic metering tank 404, an automatic metering conducting floater 405, an automatic metering finishing floater 406, an automatic metering guide rail 407, an automatic water level measuring conducting switch 408, an automatic water level measuring finishing switch 409, a water tank overflow drain 411, a water tank metering drain pipe 414 and a water tank metering drain valve 415, wherein the automatic metering tank 404 is fixed in a metering water tank body 402, the automatic metering guide rail 407 is fixed on the automatic metering tank 404, the automatic metering conducting floater 405 and the automatic water level measuring conducting switch 408 act and are respectively installed at the bottom end of the automatic metering guide rail 407, and the automatic metering finishing floater 406 and the automatic water level measuring finishing switch 409 act and are respectively installed at the top end of the automatic metering guide rail 407; the overflow portion partitioned by the tank baffle 410 is provided with a tank overflow drain 411 and connected to a tank overflow drain 413, and a height/volume scale is provided on the side wall of the metering portion of the metering tank body 402.

The automatic data acquisition system 7 is connected with a measured flowmeter in the measured system 3 through a data line.

The beneficial effects of the utility model reside in that: the flow meter teaching device has the advantages of simple structure, light volume, high automation degree, attractive appearance, stability, reliability, convenience in use and maintenance and good teaching effect, and can complete teaching work of related hydromechanics experiments such as flow meter cognition, flow meter key performance parameter measurement, flow meter performance correction and the like by two methods of a volume measurement method and a standard flow meter comparison measurement method.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate example embodiments of the invention and together with the description serve to explain the invention without limitation.

Fig. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic view of the support system of the present invention;

FIG. 3 is a schematic view of a water supply system and a standard turbine flow meter according to the present invention;

FIG. 4 is a schematic view of the system of the flow meter under test of the present invention;

FIG. 5 is a schematic view of an automatic metering system of the present invention;

FIG. 6 is a schematic view of the water storage tank of the present invention;

fig. 7 is a schematic diagram of a control and power distribution system according to the present invention;

fig. 8 is a schematic view of the automatic data acquisition system of the present invention.

In the figure: 1. a support system; 101. an aluminum alloy profile frame; 102. a caster wheel; 2. a water supply system; 201. a centrifugal water pump; 202. a main water supply line valve; 203. a main water supply pipeline; 204. A first water supply pipe; 205. a second water supply pipe; 206. a third water supply pipe; 207. a fourth water supply pipe; 208. a water supply pipe of the water pump; 209. a control valve at the front end of the first water supply pipe; 210. a control valve at the end of the first water supply pipe; 211. the front end of the second water supply pipe controls the valve; 212. a second water supply pipe end control valve; 213. the front end of the third water supply pipe controls a valve; 214. a third water supply pipe end control valve; 215. the front end of the fourth water supply pipe controls a valve; 216. a fourth water supply pipe end control valve; 3. a system under test; 301. an orifice plate flowmeter; 302. an electromagnetic flow meter; 303. a vortex shedding flowmeter; 304. an ultrasonic flow meter; 305. a first ultrasonic probe; 306. a second ultrasonic probe; 307. fixing the clamping belt; 4. An automatic metering system; 401. a dust-proof cover plate; 402. a metering water tank body; 403. a liquid buffer device; 404. an automatic metering tank; 405. the floater is automatically metered and conducted; 406. an automatic metering ending float; 407. an automatic metering guide rail; 408. the water level automatic measurement switches on the switch; 409. a water level automatic measurement ending switch; 410. a water tank baffle; 411. a water tank overflow outlet; 412. a water tank metering outlet; 413. a water tank overflow drain pipe; 414. a water tank metering drain pipe; 415. a water tank metering drain valve; 5. a water storage tank; 6. a control and power distribution system; 601. the touch screen and the power distribution terminal; 7. an automatic data acquisition system; 701. a data automatic acquisition computer; 702. a data display; 8. a standard flow metering system; 801. a standard turbine flowmeter.

Detailed Description

The details of the present invention and its embodiments are further described below with reference to the accompanying drawings.

Referring to fig. 1 to 8, the utility model discloses an automatic measurement type experiment teaching device for flowmeter is cognitive and performance correction, including braced system 1, water supply system 2, system under test 3, automatic metering system 4, water storage tank 5, control and distribution system 6, data automatic acquisition system 7, standard flow metering system 8, centrifugal water pump 201 of water supply system 2 installs in braced system 1 end foot department, and the top is connected with standard turbine flowmeter 801 of standard flow metering system 8, connects main water supply pipe 203 above standard turbine flowmeter 801, and main water supply pipe rear end connects water supply system 2; the system 3 to be tested is arranged in a sub water supply pipeline of the water supply system 2, the tail end of the water supply system 2 is provided with an automatic metering system 4 required by a volume measurement method, a water storage tank 5 is arranged at the bottom of the supporting system 1, a control and power distribution system 6 is arranged at the bottom of the supporting system 1, and an automatic data acquisition system 7 is positioned above the control and power distribution system 6.

The supporting system 1 adopts a 45 x 45mm aluminum alloy section frame 101.

The standard turbine flowmeter 801 is connected with the main water supply pipeline 203 in series and is connected with the automatic data acquisition system 7 through a data line, and the automatic measurement of a standard flowmeter comparison measurement method is realized.

The various to-be-measured flow meters in the to-be-measured system 3 are respectively connected in series with the four sub water supply pipelines and can be disassembled and replaced, wherein the to-be-measured ultrasonic flow meter can be fixed at any position of the fourth water supply pipe 207 by the fixing clamping belt 307, and is used for realizing comparison experiments of flow measurement precision of different positions.

The automatic metering system 4 adopts a split structure design, an automatic metering device is arranged in the metering water tank body 402 and is connected with the automatic data acquisition system 7 through a data line to realize automatic measurement of a volume measurement method, and the metering water tank body 402 and the dustproof cover plate 401 at the top are designed in a separated mode; in order to ensure smooth exhaust of the metering water tank, a gap exists between the dustproof cover plate 401 and a tail end pipeline of the water supply system 2; to ensure that the liquid level in the metering tank changes smoothly, a liquid buffer 403 is included in the tank.

The automatic metering device comprises an automatic metering tank 404, an automatic metering conducting floater 405, an automatic metering finishing floater 406, an automatic metering guide rail 407, an automatic water level measuring conducting switch 408, an automatic water level measuring finishing switch 409, a water tank overflow drain 411, a water tank metering drain pipe 414 and a water tank metering drain valve 415, wherein the automatic metering tank 404 is fixed in a metering water tank body 402, the automatic metering guide rail 407 is fixed on the automatic metering tank 404, the automatic metering conducting floater 405 and the automatic water level measuring conducting switch 408 act and are respectively installed at the bottom end of the automatic metering guide rail 407, and the automatic metering finishing floater 406 and the automatic water level measuring finishing switch 409 act and are respectively installed at the top end of the automatic metering guide rail 407; the overflow part separated by the tank baffle 410 is provided with a tank overflow drain 411 and is connected with a tank overflow drain 413, and the side wall of the metering part of the metering tank body 402 is provided with a height/volume scale for assisting in observing the change of the volume of the metering liquid in the metering tank.

The automatic data acquisition system 7 is connected with a measured flowmeter in the measured system 3 through a data line and is used for acquiring and processing related experimental data to realize automatic measurement.

Example (b):

referring to fig. 1 to 8 show, the utility model discloses a be used for providing an automatic teaching device that is used for cognitive key performance parameter of flowmeter to survey and performance to rectify the experiment, realized the cognition of common kind flowmeter in the engineering and the correction of each other of flowmeter through uncomplicated structure and uncomplicated structure, improved the precision of correction through automatic measurement, the experimentation is simple understandable, and the experimental result expresses easily, has improved the efficiency and the quality of teaching. The main body frame is a 45 x 45mm aluminum alloy section, the centrifugal water pump is installed at the end foot of the main body frame, the upper part of the centrifugal water pump is connected with a water supply structure, and the standard flowmeter and the measured flowmeter are installed in the water supply structure and form a closed water loop together with the water storage tank and the metering tank. The standard flowmeter, the measured flowmeter and the acquisition and control unit arranged at the right lower part of the main body frame form a closed acquisition and control loop, and the tail end of the water supply structure is a water storage tank which is arranged at the bottom of the aluminum alloy section bar frame.

A automatic type experiment teaching device for flowmeter is cognitive and performance correction, braced system 1 is 45X 45 mm's aluminum alloy ex-trusions 101, simple structure, and the volume is light and handy, can accomplish the correction to the flowmeter reliably, and the appearance is pleasing to the eye, and is reliable and stable, convenient to use and maintenance. The centrifugal water pump 201 is arranged at the end foot of the support system 1, a main water supply pipeline valve 202 is connected above the centrifugal water pump 201, a standard turbine flowmeter 801 is connected above the main water supply pipeline valve 202 through threads, the standard turbine flowmeter is used as a verified standard flowmeter and is used for calibrating and correcting a flowmeter of a tested system 3 through a standard flowmeter comparison method, the main water supply pipeline 203 is connected above the standard turbine flowmeter 801, the main water supply pipeline 203 is divided into four sub-water supply pipelines at a second bending part and forms the sub-water supply pipelines of the water supply system 2, the tested system 3 is arranged in the sub-water supply pipelines of the water supply system 2, wherein a tested orifice flowmeter 301 is connected in series in a first sub-water supply pipeline 204, the orifice flowmeter is used as a typical example of a differential pressure flowmeter and is used for showing relevant contents of the differential pressure flowmeter for students, and the orifice flowmeter 301 is connected with the pipelines through a structure of adding a sealing gasket and fixing, under the condition of medium and low pressure, the sealing gasket can ensure the sealing performance of the water supply system under the action of the pre-tightening force of the fixing clamping sleeve, and the connecting and sealing structure can be installed and replaced conveniently on the premise of ensuring enough connecting strength and sealing performance. In the actual operation process, in order to show other types of differential pressure type flow meters (such as venturi flow meters) to students, the orifice plate flow meter 301 can be replaced, the orifice plate flow meter 301 is used as the differential pressure type flow meter, two pressure measuring pipes are led out from the orifice plate flow meter 301, a transmission passage for measuring data of key performance parameters and pressure values is connected to the data acquisition system 7, and automatic acquisition and measurement of the key performance parameters and the pressure values are realized through a pressure sensor arranged in the data acquisition system 7. An electromagnetic flowmeter 302 is connected in series in the second water supply pipeline 205, the electromagnetic flowmeter 302 is connected with the pipeline through a threaded structure, the threaded connection structure can guarantee sufficient connection strength and the tightness of a water supply system, and the electromagnetic flowmeter 302 is connected with the data acquisition system 7 through a data transmission channel to achieve automatic acquisition and measurement of flow parameters. The third water supply pipe 206 is connected in series with a vortex flowmeter 303, the vortex flowmeter 303 is connected with the pipeline through a threaded structure, the threaded connection structure can guarantee sufficient connection strength and the sealing performance of a water supply system, and the vortex flowmeter 303 is connected with the data acquisition system 7 through a data transmission channel to achieve automatic acquisition and measurement of flow parameters. The fourth sub-water supply pipe 207 is a totally closed pipeline, the ultrasonic flowmeter 304 is fixed on the water supply pipe 207 through the clamping band structure 307, the ultrasonic measuring probe I required for the ultrasonic flowmeter to measure, two 305, 306, adopt modes such as fixed glue bonding to arrange respectively on the water supply pipe 207 of the both sides of the ultrasonic flowmeter along the water flow direction, the ultrasonic probe I, two 305, the concrete position of 306 on the water supply pipe 207 can be adjusted to the measuring position according to the teaching requirement, the ultrasonic flowmeter 304 is connected with the data acquisition system 7 through a data transmission channel, and the automatic acquisition and measurement of flow parameters are realized. The tail end of the water supply system 2 is provided with an automatic metering system 4, in order to ensure that water flowing into the automatic metering system 4 from the water supply system 2 moves stably, a water flow buffer device 403 is arranged in the metering water tank, the buffer device can smooth water flow, large impact of impact water flow on the liquid level of the metering water tank is avoided, metering errors are reduced, the automatic metering system adopts a volume measurement principle, a metering water tank body 402 and a dustproof cover plate 401 adopt a split structure design, the dustproof cover plate 401 adopts a split structure, and the cleaning of the water tank and the assembly and disassembly of the flow buffering device are facilitated; the upper surface is provided with an exhaust hole which is convenient for exhausting the internal air when the volume of the water tank changes, the matching of the dustproof cover plate 401 and the pipeline at the tail end of the water supply system 2 is clearance fit, and the clearance between the dustproof cover plate and the pipeline is convenient for installing and fixing an opening and closing cover and exhausting the internal air when the volume of the water tank changes; the metering water tank is internally provided with a water tank baffle 410, the height of the water tank baffle is lower than that of the water tank body, the inside of the metering water tank is divided into a metering part and an overflow part by the water tank baffle, the metering part is used for realizing the automatic metering of flow, and the overflow part is used for guiding the water exceeding the metering part back into the water storage water tank 5 through a water tank overflow drainage outlet 411 and a water tank overflow drainage pipe 413 which are positioned at the bottom of the overflow part. The position of the water tank baffle 410 is at the right side of the 4 th water supply pipe, which can ensure that the water of the first to the fourth total 4 water supply pipes can directly flow into the metering part of the water tank through the buffer device, the metering part is internally provided with an automatic volume metering groove 404, the bottom of the automatic metering groove 404 is provided with a plurality of small holes which are used as communicating vessels to keep the liquid level of the water tank and the like, an automatic metering mechanism is arranged in the automatic metering groove 404, the automatic metering structure consists of an automatic metering conducting floater 405, an automatic metering ending floater 406, an automatic metering guide rail 407, an automatic water level measuring conducting switch 408 and an automatic water level measuring ending switch 409, the automatic water level measuring conducting switch 408 and the automatic water level measuring ending switch 409 are connected with the data acquisition system 7 through leads, the bottom of the water tank metering part is provided with a water tank metering drainage outlet 412, and a, the middle of the water tank metering drainage pipe is connected with a water tank metering drainage valve 415 through threads, the communication relation between the water tank metering part and the water storage water tank 5 can be controlled by controlling the water tank metering drainage valve 415, and in the automatic measurement process, automatic flow metering is completed through the interaction of an automatic metering conduction floater 405, an automatic metering completion floater 406, an automatic metering guide rail 407, an automatic water level measuring conduction switch 408, an automatic water level measuring completion switch 409 and the water tank metering drainage valve 415. To ensure that the fluid in the water supply system does not cause significant disturbance to the metering tank level during a fall, the tank has a flow buffer 403. The installation height of the water storage tank 5 in the vertical direction is lower than that of the metering tank, water in the metering tank flows back into the water storage tank under the action of gravity, the recycling of working liquid media is realized, the water storage tank 5 is installed at the bottom of the supporting system 1, the water storage tank 501 is connected with the automatic metering tank body 402 through a water tank metering drain pipe 414 and a water tank overflow drain pipe 413, the automatic data acquisition system 7 is the core of automatic system measurement and mainly comprises a data acquisition computer 701 and a data display 702, and the data acquisition computer comprises components such as a physical quantity measuring sensor, an acquisition card and the like.

Referring to fig. 1 to 8, the utility model discloses an automatic teaching device's for flowmeter is cognitive, key performance parameter measures and proofreads the experiment working process as follows:

when the automatic self-checking system starts to work, the control and power distribution system 6 is started, the touch screen and the power distribution terminal 601 are started, the power distribution system performs self-checking, after the self-checking is passed, the automatic data acquisition system 7 is started, the automatic data acquisition computer 701 and the data display 702 are started, the automatic data acquisition system performs self-checking, and after the self-checking is finished, a self-checking result is displayed through the data display. The centrifugal water pump 201 installed at the end foot of the support system 1 is controlled by the data acquisition computer 701 to start to act, the centrifugal water pump pumps out the water in the water storage tank 5 and flows into the main water supply pipeline through the main water supply valve 202, flows along the main water supply pipeline 203 and flows through the standard turbine flow meter 801 on the main water supply pipeline 203, the standard turbine flow meter is used as a core element of a standard flow meter comparison measurement method, the standard turbine flow meter measures the flow rate flowing through the main water supply pipeline, the flow meter data is transmitted to the data automatic acquisition computer 701 through a data line and is stored and displayed as standard flow rate data, the water in the water supply pipeline is divided into four branches at the second bending part of the water supply pipeline 203, enters the water supply system 2 and flows through the measured flow system 3 installed in the sub water supply pipelines of the water supply system 2, wherein the orifice plate flow meter 301 is connected in series in the first sub water supply pipeline, the orifice plate flowmeter is used as a differential pressure type flowmeter, pressure change can be generated when liquid flows through an orifice of the orifice plate flowmeter, and the difference value of the pressure change before and after the orifice is a key performance parameter of the flow metering of the orifice plate flowmeter, so pressure measuring holes are formed in the front and the back of the orifice plate flowmeter and are connected with a data acquisition computer through the pressure measuring pipes, a pressure sensor is arranged in the data acquisition computer, the pressure before and after the orifice plate flowmeter is measured through the pressure sensor and the pressure measuring pipes, and the pressure difference value is calculated and displayed through a data display. The method aims to enable students to know the flow metering principle (orifice flow equation) and key performance parameters (pressure difference value) of the differential pressure type flowmeter (orifice plate flowmeter) and help the students to establish the mapping relation between the flow and the pressure difference value. In the experimental operation process, the student needs to close the front end control valve 209 of the first water supply pipe, fully open the end control valve 210 of the first water supply pipe, close the front end control valve 211 of the second water supply pipe, the end control valve 212 of the second water supply pipe, the front end control valve 213 of the third water supply pipe, the end control valve 214 of the third water supply pipe, the front end control valve 215 of the fourth water supply pipe, and the end control valve 216 of the fourth water supply pipe; opening a water tank metering and draining valve 415, completely draining the water in the metering water tank body 402 into the water storage water tank 5, after the water in the metering water tank body 402 is completely drained, closing the water tank metering and draining valve 415, so that the automatic metering system 4 is in a disconnected state with the water storage water tank 5, opening a front end control valve 209 of a first water supply pipe, enabling the water to flow into a metering part of the metering water tank through the measured orifice plate flowmeter 301 and the buffer device 403, enabling the water to flow into the automatic metering tank through a small hole formed in the automatic metering tank 404, keeping the liquid level in the automatic metering tank 404 consistent with the liquid level of the water tank according to a communicating device principle, enabling the liquid in the automatic metering tank 404 to generate a force on the automatic metering and conducting floater 405 to move along a buoyancy automatic metering and conducting guide rail 407, and when the automatic metering and conducting floater 405 moves to be in contact with the automatic water level measuring, the automatic water level measuring switch 408 is powered on and is transmitted to the automatic data acquisition computer 701 through a data lead, the liquid level in the automatic metering tank 404 synchronously rises in equal amplitude along with the rise of the liquid level of the water tank, when the liquid level rises to the installation position where the automatic metering ending float 406 is located, the automatic metering ending float 406 moves along the automatic metering guide rail 407 by the buoyancy, when the automatic metering end float 406 moves to contact the automatic water level measuring end switch 409, the automatic water level measuring end switch 409 is energized, and is transmitted to the data automatic acquisition computer 701 through a data wire, the water in the metering water tank automatically overflows to the overflow part of the metering water tank after exceeding the height of the water tank baffle 410, the water is returned to the storage water tank 5 through the tank overflow drain 411 and the tank overflow drain 413 at the bottom end of the overflow portion, thereby realizing the recycling of the water. The system calculates an average flow value obtained by a volume method according to the collected physical quantity and preset parameters, compares the average flow value, a standard flow value and theoretical flow obtained through a differential pressure value to obtain related correction parameters of the orifice plate flowmeter, performs related display through a data display 702, compares the difference between correction and calibration of the orifice plate flowmeter between a volume measurement method and a standard flowmeter comparison method, and can adjust the flow by changing the opening degree of a control valve 209 at the front end of a first water supply pipe to realize cognition of the orifice plate flowmeter 301 and measurement and calibration of key performance parameters (differential pressure values) under different flows. Similarly, an electromagnetic flowmeter 302 is connected in series to the second water supply line 205, the electromagnetic flowmeter is used as an instrument for measuring the flow rate according to the electromagnetic induction principle, the key performance parameter is induced voltage, the electromagnetic flowmeter 302 is connected to the automatic data acquisition computer 701 through a data transmission line, the induced voltage of the key performance parameter is transmitted to the automatic data acquisition computer 701 through a data transmission line, and the induced voltage is displayed by the data display 702. The electromagnetic flow meter aims to help students to know the electromagnetic flow metering principle and key performance parameters (induced voltage) and help the students to establish a mapping relation between flow and the induced voltage. The experimental operation process is similar to that of the orifice flowmeter 301, except that the first water supply front end control valve 209 and the first water supply tail end control valve 210 are all closed, the operation object is equivalently replaced by the second water supply pipe front end control valve 211 and the second water supply pipe tail end control valve 212, the system calculates the average flow value obtained by a volume method according to the collected physical quantity, preset parameters and a calculation method, compares the average flow value and the standard flow value with the theoretical flow value obtained by induced voltage to obtain relevant correction parameters of the electromagnetic flowmeter, performs relevant display through the data display 702, compares the difference of the volume method and the standard flowmeter comparison method in correction and calibration of the electromagnetic flowmeter, and performs flow regulation to realize the cognition, calibration and the like of the electromagnetic flowmeter 302 under different flow conditions by changing the opening degree of the second water supply pipe front end control valve 211, And measuring key performance parameters (induced voltage) and calibrating and correcting. Similarly, a vortex flowmeter 303 is connected in series to the third water supply line 206, the vortex flowmeter is used as an instrument for measuring flow according to the karman vortex street principle, the key performance parameter of the vortex flowmeter is vortex street pulse, the vortex flowmeter 303 is connected with the automatic data acquisition computer 701 through a data transmission line, and the data display 702 is used for displaying. The method aims to help students to know the vortex street flow metering principle and key performance parameters (vortex street pulse) and help students to establish the mapping relation between flow and vortex street pulse. The operation process of the experiment is similar to that of the orifice flowmeter 301, and the difference is that the first water supply front end control valve 209 and the first water supply tail end control valve 210 are all closed, the operation object is equivalently replaced by the third water supply pipe front end control valve 213 and the third water supply pipe tail end control valve 214, the system calculates the average flow value obtained by adopting a volume method according to the collected physical quantity, preset parameters and a calculation method, the average flow value, the standard flow value and the theoretical flow value obtained by the induced voltage are compared to obtain the related correction parameters of the vortex shedding flowmeter, the related display is carried out by the data display 702, the difference of the volume method and the standard flowmeter comparison method in the correction and calibration of the vortex shedding flowmeter is compared, and the flow can be adjusted by changing the opening degree of the third water supply pipe front end control valve 213 to realize the cognition of the vortex shedding flowmeter 303 under different flow conditions, And (4) measuring and calibrating key performance parameters (vortex street pulses). Similarly, the fourth water supply pipeline 207 is a totally-enclosed pipeline, the ultrasonic flowmeter 304 is fixed on the fourth water supply pipeline 207 through a fixing clamping band, the ultrasonic flowmeter realizes measurement through a first ultrasonic probe (305) and a second ultrasonic probe (306) which are respectively arranged on the upstream and downstream of the fourth water supply pipeline 207, the ultrasonic flowmeter is used as a meter for carrying out flow measurement according to a propagation velocity difference method, the core parameter of the ultrasonic flowmeter is a velocity time difference, the ultrasonic flowmeter 304, the first ultrasonic probe (305) and the second ultrasonic probe (306) are connected with the automatic data acquisition computer 701 through data transmission lines, the velocity transmission time difference of the key performance parameter is transmitted to the automatic data acquisition computer 701 through the data transmission lines, and the data display 702 is used for displaying. The purpose is to help students to know the metering principle and key performance parameters (propagation speed time difference) of the ultrasonic flowmeter, help students to establish the mapping relation between flow and time difference and master the flow non-contact measurement method. The operation process of the experiment is similar to that of the orifice flowmeter 301, except that the first water supply front end control valve 209 and the first water supply tail end control valve 210 are all closed, the operation object is equivalently replaced by the fourth water supply pipe front end control valve 215 and the fourth water supply pipe tail end control valve 216, the system calculates the average flow value obtained by adopting a volume method according to the collected physical quantity, preset parameters and a calculation method, compares the average flow value and the standard flow value with the theoretical flow value obtained by the induced voltage to obtain related correction parameters of the ultrasonic flowmeter, performs related display through the data display 702, compares the difference of the volume method and the standard flowmeter comparison method in the correction and calibration of the ultrasonic flowmeter, and can realize the cognition of the ultrasonic flowmeter 303 under different flow conditions by changing the opening degree of the fourth water supply pipe front end control valve 215 and performing flow regulation, The measurement of key performance parameters (speed time difference) and the calibration and correction work deepen the cognition of the basic measurement principle through the comparison of the measurement results of different measurement positions.

The casters 102 are arranged below the aluminum alloy profile frame 101, so that the whole experimental device is convenient to move; the centrifugal water pump 201 is connected to a water pump supply pipe 208.

The automatic teaching device for the flow meter cognition, key performance parameter measurement and performance correction experiments has the advantages of compact structure, ingenious design and strong reliability. The experimental teaching device comprises the types of flowmeters commonly used in engineering, and is beneficial to increasing the engineering cognition of students; meanwhile, compared with the traditional experimental device for correcting the flowmeter only by using a volume method, the experimental device introduces the standard turbine flowmeter as a tool for realizing a standard flowmeter comparison measurement method, and provides help for students to master different flowmeter calibration and correction methods and to recognize experimental errors; the introduction of the automatic data acquisition system is helpful for helping students to master the metering principle of a common flowmeter, quantizes the mapping relation between key characteristic parameters and flow, is obviously helpful for reducing measurement errors and improving the innovative thinking of the students, and the introduction of the volume method flow automatic metering device and the liquid flow buffer device greatly improves the impact interference of liquid vibration on the liquid level change of the metering water tank and is beneficial to improving the accuracy and the experimental efficiency of the volume method flow correction flowmeter; in the ultrasonic flowmeter correction link, the measurement position of the ultrasonic probe is changed, so that students can be helped to understand the basic measurement principle of measuring point arrangement in flow measurement. The experimental device adopts the modular design by the flow meter, is convenient for the replacement and connection of the flow meter, realizes the principle mastering and key measurement parameter quantification and calibration correction teaching work while realizing the cognition of the flow meter through the uncomplicated structure, improves the correction efficiency and ensures the correction precision. The experimental device has the advantages of compact structure, simplicity and convenience in operation, reliable experimental results and the like, and is favorable for improving the quality and efficiency of experimental teaching of the relevant flowmeter.

The above description is only a preferred example of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made to the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides an automatic measurement type experiment teaching device for flowmeter is cognitive and performance correction which characterized in that: the system comprises a supporting system (1), a water supply system (2), a system to be tested (3), an automatic metering system (4), a water storage tank (5), a control and power distribution system (6), an automatic data acquisition system (7) and a standard flow metering system (8), wherein a centrifugal water pump (201) of the water supply system (2) is installed at the end foot of the supporting system (1), a standard turbine flowmeter (801) of the standard flow metering system (8) is connected above the centrifugal water pump, a main water supply pipeline (203) is connected above the standard turbine flowmeter (801), and the rear end of the main water supply pipeline is connected with the water supply system (2); the system to be tested (3) is arranged in a sub water supply pipeline of the water supply system (2), the tail end of the water supply system (2) is an automatic metering system (4) required by a volume measurement method, the water storage tank (5) is arranged at the bottom of the supporting system (1), the control and power distribution system (6) is arranged at the bottom of the supporting system (1), and the automatic data acquisition system (7) is positioned above the control and power distribution system (6).

2. The automatic measurement-type experimental teaching device for flowmeter cognition and performance correction according to claim 1, wherein: the supporting system (1) adopts a 45 x 45mm aluminum alloy profile frame (101).

3. The automatic measurement-type experimental teaching device for flowmeter cognition and performance correction according to claim 1, wherein: the standard turbine flowmeter (801) is connected with a main water supply pipeline (203) in series and is connected with an automatic data acquisition system (7) through a data line, so that automatic measurement of a standard flowmeter comparison measurement method is realized.

4. The automatic measurement-type experimental teaching device for flowmeter cognition and performance correction according to claim 1, wherein: the water supply system (2) is divided into four sub water supply pipelines at the second bending part of the main water supply pipeline (203).

5. The automatic measurement-type experimental teaching device for flowmeter cognition and performance correction according to claim 1, wherein: various to-be-measured flowmeters in the to-be-measured system (3) are respectively connected with the four sub water supply pipelines in series and can be disassembled and replaced, wherein the to-be-measured ultrasonic flowmeter is fixed at any position of the fourth water supply pipeline (207) through a fixing clamping belt (307), and comparison experiments of flow measurement precision of different positions are realized.

6. The automatic measurement-type experimental teaching device for flowmeter cognition and performance correction according to claim 1, wherein: the automatic metering system (4) adopts a split structure design, an automatic metering device is arranged in the metering water tank body (402) and is connected with the automatic data acquisition system (7) through a data line, so that the automatic measurement of a volume measurement method is realized, and the metering water tank body (402) and the dustproof cover plate (401) at the top are designed separately; a gap is formed between the dustproof cover plate (401) and a pipeline at the tail end of the water supply system (2); the water tank contains a liquid buffer device (403).

7. The automatic measurement-type experimental teaching device for flowmeter cognition and performance correction according to claim 6, wherein: the automatic metering device comprises an automatic metering tank (404), an automatic metering conducting floater (405), an automatic metering ending floater (406), an automatic metering guide rail (407), a water level automatic measuring conducting switch (408), a water level automatic measuring ending switch (409), a water tank overflow drain outlet (411), a water tank metering drain pipe (414) and a water tank metering drain valve (415), wherein the automatic metering tank (404) is fixed in a metering water tank body (402), the automatic metering guide rail (407) is fixed on the automatic metering tank (404), the automatic metering conducting floater (405) and the water level automatic measuring conducting switch (408) act and are respectively installed at the bottom end of the automatic metering guide rail (407), and the automatic metering ending floater (406) and the water level automatic measuring ending switch (409) act and are respectively installed at the top end of the automatic metering guide rail (407); the overflow part separated by the water tank baffle (410) is provided with a water tank overflow drain outlet (411) and is connected with a water tank overflow drain pipe (413), and the side wall of the metering part of the metering water tank body (402) is provided with a height/volume scale.

8. The automatic measurement-type experimental teaching device for flowmeter cognition and performance correction according to claim 1, wherein: the automatic data acquisition system (7) is connected with a measured flowmeter in the measured system (3) through a data line.