A high-precision detection method and device for liquid flow

Abstract

The present invention discloses a high-precision detection method and device for liquid flow, and relates to the technical field of flow detection. The present invention comprises the following steps: connecting n detection terminals in series in pairs, the processing unit sequentially numbers the detection terminals in the series order, connecting the first and the last detection terminals in series with the detected pipeline, taking the vertical downward as the reference line, adjusting the installation position of the ultrasonic flow sensor, the angles generated by the installation position and the reference line are sequentially multiples of the angle θ, the detection terminals of the present invention are sequentially calibrated in series, the larger the number of detection terminals, the more accurate the detected flow information, and the detection accuracy of the flow of the component-free fluid in the pipeline is improved, and each detection terminal can dynamically adjust the cross-sectional state in real time by setting the unit time t, and the real-time update can make the detection terminal still maintain the detection accuracy in the case of mixed fluids.

Description

Technical Field

[0001] The present invention relates to the technical field of flow detection, and in particular to a high-precision detection method and device for liquid flow. Background Art

[0002] There are two main types of liquid flow detection devices. One is an in-pipe flow meter represented by a differential pressure flow meter or a volumetric flow meter. The differential pressure flow meter is based on the Bernoulli equation. When the fluid flows through the throttling device in the pipeline, a pressure difference is generated before and after the throttling device. According to the relationship that the pressure difference is proportional to the square of the flow rate, the flow rate is calculated by measuring this pressure difference. The volumetric flow meter calculates the flow rate by measuring the number of times the fluid fills or discharges the metering chamber per unit time. There are fixed parts inside the differential pressure flow meter, and there are moving parts inside the volumetric flow meter. The other is a component-free flow meter represented by an electromagnetic flow meter or an ultrasonic flow meter. The electromagnetic flow meter is based on Faraday's law of electromagnetic induction. When a conductive liquid flows in a magnetic field, an induced electromotive force proportional to the flow rate is generated to calculate the flow rate. The ultrasonic flow meter calculates the flow rate by measuring the change in the propagation speed of ultrasonic waves in the fluid or the propagation time difference. Electromagnetic flow meters and ultrasonic flow meters do not have fixed parts or moving parts in the measured pipeline.

[0003] The measurement of flow meters with in-pipe components is more accurate, but the in-pipe components are in direct contact with the fluid medium and are prone to blockage, corrosion or wear. Although component-free flow meters can avoid this problem, there is a certain error in measuring flow, especially when multiple fluids are mixed. The fluctuating fluid density will further increase the error. Therefore, the development of high-precision component-free flow meters is a technical problem that technical personnel in this field need to solve. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a high-precision detection method and device for liquid flow, which solves the problems raised in the above-mentioned background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a high-precision liquid flow detection method and device, which is implemented based on a processing unit, a switch and n detection terminals, wherein the detection terminals are respectively provided with an ultrasonic flow sensor, a servo motor and an adjustment device, and comprises the following steps:

[0006] Step 1: Manually connect n detection terminals in series, the processing unit numbers the detection terminals in sequence according to the series connection order, and manually connect the first and last detection terminals in series to the pipeline to be detected. The manual operation is performed by on-site staff;

[0007] Step 2: With vertical downward as the reference line, manually adjust the installation position of the ultrasonic flow sensor so that the angle between the installation position of the ultrasonic flow sensor and the reference line is a multiple of the angle θ. The angle between the installation position of the ultrasonic flow sensor in the first detection terminal and the reference line is θ, marked as θ1. The angle between the installation position of the ultrasonic flow sensor in the second detection terminal and the reference line is 2 times θ, marked as θ2. By analogy, the size of the angle θ is 180° / n. The size of the angle θ depends on the number of detection terminals n. Manually input the angle θ corresponding to each input detection terminal into the processing unit. The processing unit binds the angle θ to the number of each detection terminal. Manually measure the inner diameter r of the detected pipeline, and manually input the inner diameter r into the processing unit.

[0008] Step 3: The processing unit sends an initialization instruction to the switch, and the switch forwards the initialization instruction to all detection terminals. Each detection terminal executes the initialization program. The processing unit presets the cross-sectional state α, and the value range of the cross-sectional state α is 0.01-0.99;

[0009] Step 4: The processing unit presets a weight sequence, the number of ranks in the weight sequence is consistent with the number n of detection terminals, each rank in the weight sequence is arranged from large to small according to the weight value β, each rank in the weight sequence is sequentially bound to the detection terminal, and the binding order is the order in which the detection terminals are connected in series, and the sum of the weight values ​​β of all ranks in the weight sequence is 1;

[0010] Step 5: When the liquid is a single fluid medium, the fluid density of the liquid is in a constant state, and the liquid is manually input into the processing unit as a single fluid medium, and the processing unit executes a static calibration program to obtain the first flow information Ψ1 of the single fluid;

[0011] Step 6: When the liquid is a mixed fluid medium, the fluid density of the liquid is in a fluctuating state, and the liquid is manually input into the processing unit as a mixed fluid medium. The processing unit executes a dynamic calibration program to obtain the second flow information Ψ2 of the mixed fluid.

[0012] Furthermore, the initialization procedure specifically includes the following steps:

[0013] The initialization instruction is forwarded by the switch to the servo motor of each detection terminal. The servo motor drives the adjustment device to expand to the maximum amplitude, and the processing unit records the rotation angle of the output shaft of the servo motor. The servo motor drives the adjustment device to close to the minimum amplitude, and the processing unit records the rotation angle of the output shaft of the servo motor. When the adjustment device is expanded to the maximum amplitude, the cross-sectional state α is assigned a value of 0.01, and when the adjustment device is closed to the minimum amplitude, the cross-sectional state α is assigned a value of 0.99. The processing unit assigns the cross-sectional state α according to the rotation angle of the output shaft of the servo motor.

[0014] Further, the static calibration procedure specifically includes the following steps:

[0015] Step 501: The processing unit randomly assigns a cross-sectional state α to each detection terminal. The processing unit converts the assigned cross-sectional state α into a control instruction and transmits it to the servo motor of the corresponding detection terminal. The servo motor rotates its output shaft to the corresponding angle according to the control instruction, and the servo motor drives the adjustment device to expand or close to the size specified by the control instruction.

[0016] Step 502: The ultrasonic flow sensor obtains the flow velocity information v at its location and transmits it to the processing unit through the switch.

[0017] Step 503: The processing unit calculates the error index λ between the first detection terminal and the second detection terminal according to the formula where α1 is the cross-sectional state of the first detection terminal, α2 is the cross-sectional state of the second detection terminal, β1 is the weight value of the first detection terminal in the weight sequence, β2 is the weight value of the second detection terminal in the weight sequence, v1 is the flow velocity information obtained by the ultrasonic flow sensor in the first detection terminal, v2 is the flow velocity information obtained by the ultrasonic flow sensor in the second detection terminal, θ1 is the angle between the ultrasonic flow sensor in the first detection terminal and the reference line, and θ2 is the angle between the ultrasonic flow sensor in the second detection terminal and the reference line. If λ - 2 > β2, it means that the detection accuracy error of the second detection terminal is relatively large and does not meet the detection requirements. The processing unit reduces the cross-sectional state α of the second detection terminal by , and repeats step 503 again, where n is the number of series-connected detection terminals and m is the number of times of repeating step 503 and 2m < n. When step 503 is repeated once, the cross-sectional state α is reduced by , when step 503 is repeated twice, the cross-sectional state α is reduced by , and so on. On the contrary, if λ - 2 ≤ β2, it means that the detection accuracy error of the second detection terminal is relatively small and meets the detection requirements. The processing unit executes the next step;

[0018] Step 504: The processing unit calculates the error index λ between each detection terminal in turn according to the process of step 503, and the calculation order is according to the order of series connection of the detection terminals. The processing unit calculates the error index λ between the second detection terminal and the third detection terminal. If λ - 2 > β3, the processing unit reduces the cross-sectional state α of the second detection terminal by and executes step 503 again. On the contrary, if λ - 2 ≤ β3, the processing unit calculates the error index λ between the subsequent third detection terminal and the fourth detection terminal, and so on, until the error index λ between all detection terminals is completely calculated in a loop;

[0019] Step 505: The processing unit calculates according to the formula The flow rate Q of each detection terminal is calculated, and the processing unit calculates the average value of the flow rate Q corresponding to all the detection terminals to obtain the first flow rate information Ψ1. The first flow rate information Ψ1 is the flow rate information of a single fluid in the currently detected pipeline. The detection terminals are calibrated in sequence in a series manner, and the weight value β gradually decreases. The later the detection terminal is, the smaller the adjustment amplitude is. In theory, the larger the number n of detection terminals is, the more accurate the detected flow rate information is, and the detection accuracy of the fluid flow in the pipeline is improved under the premise that there are no moving parts in the pipeline.

[0020] Furthermore, the dynamic calibration procedure specifically includes the following steps:

[0021] Step 601: The processing unit presets a unit time t, and the processing unit Calculate the specific value of the unit time t, Ψ1 is the first flow information, w1 and w2 are proportional coefficients, w1 and w2 are determined according to the proportion between the mixed fluids, and vp is the average value of the flow velocity information v obtained by all ultrasonic flow sensors;

[0022] Step 602: Every unit time t, the processing unit transmits the cross-sectional state α of each detection terminal to the last connected detection terminal in the reverse order of the liquid flow direction, the original cross-sectional state α of the fourth detection terminal is transmitted to the third detection terminal, the original cross-sectional state α of the third detection terminal is transmitted to the second detection terminal, and so on, the cross-sectional state α of the first detection terminal is transmitted to the last detection terminal;

[0023] Step 603: when the cross-sectional states α of all detection terminals change uniformly, the processing unit executes a static calibration procedure, and when the static calibration procedure is executed, the cross-sectional states α of the detection terminals change in sequence according to the series connection order;

[0024] Step 604: the processing unit counts the first flow information Ψ1 within each unit time t, calculates the average value of the first flow information Ψ1 of all unit times t to obtain the second flow information Ψ2, and the second flow information Ψ2 is the flow information of the mixed fluid in the detected pipeline.

[0025] A high-precision detection device for liquid flow, comprising a processing unit, a switch and n detection terminals, wherein the detection terminal comprises two flanges, wherein opposite sides of the two flanges are connected with a pipe body, and opposite sides of the two flanges are respectively connected with a detected pipeline or other detection terminals through bolts, wherein opposite sides of the two pipe bodies are connected with elastic pipes, wherein the bottom of one pipe body is fixedly connected with a fixing plate through bolts, and one side of the fixing plate is fixedly connected with an adjusting device, and the top of the other pipe body is fixedly connected with a servo motor, wherein one end of the output shaft of the servo motor is fixedly connected with a driving wheel, and the peripheral side of the driving wheel is transmission-connected with the peripheral side of the adjusting device, and the inner surface of the adjusting device is in contact with the peripheral side of the elastic pipe, and when the adjusting device is gradually closed, the elastic pipe is squeezed inside the adjusting device to make the elastic pipe contract, and the cross section of the liquid flowing inside the elastic pipe is reduced, and when the adjusting device is gradually expanded, the elastic potential energy of the elastic pipe itself is restored to make the elastic pipe expand, and the cross section of the liquid flowing inside the elastic pipe is increased, and an ultrasonic flow sensor is fixedly connected with the side of the peripheral side of the elastic pipe close to the fixing plate, and the ultrasonic flow sensor can be installed at any angle of the elastic pipe, can be installed at the top of the elastic pipe close to the fixing plate, and can also be installed at the bottom of the elastic pipe close to the fixing plate;

[0026] The adjusting device comprises a first circular ring and a second circular ring, wherein the circumferential side surface of the first circular ring is transmission-connected with the lateral surface of the driving wheel shaft, the lateral surface of the second circular ring is fixedly connected with a fixing plate, twelve fixing shafts are fixedly connected to the side of the second circular ring away from the fixing plate, the fixing shafts are evenly distributed on the surface of the second circular ring in an annular shape, a rotating sheet is rotatably connected to the circumferential side surface of the fixing shaft, the outer shape of the rotating sheet is an arc-shaped structure, one side of the rotating sheet is fixedly connected with a sliding shaft, the inner surface of the first circular ring is rotatably connected with the circumferential side surface of the second circular ring, twelve strip grooves are opened on the surface of the first circular ring, the strip grooves are evenly distributed on the surface of the first circular ring in an annular shape, and the circumferential side surface of the sliding shaft is slidably connected with the inner surface of the strip grooves;

[0027] The port of the processing unit is connected to the switch, the port of each detection terminal is connected to the port of the switch, the output end of the switch is connected to the input end of the servo motor, the processing unit controls the forward and reverse rotation of the output shaft of the servo motor through the switch, the output end of the ultrasonic flow sensor is connected to the input end of the switch, the ultrasonic flow sensor obtains the flow velocity information v of the liquid flowing through the elastic tube in real time and transmits it to the switch, and the switch forwards the received flow velocity information v to the processing unit.

[0028] Furthermore, the specific steps of the closing and unfolding process of the adjustment device are as follows:

[0029] When the regulating device needs to be closed, the processing unit sends a control instruction to the servo motor through the switch, the output shaft of the servo motor rotates to drive the driving wheel to rotate, the driving wheel rotates to drive the first ring to rotate, the twelve sliding shafts slide in the strip groove toward the axis of the second ring, the twelve rotating pieces rotate toward the axis of the second ring with the fixed shaft as the center, the rotation of the twelve rotating pieces squeezes the side surface of the elastic tube to make the elastic tube shrink, and the cross section of the elastic tube through which the liquid flows is reduced;

[0030] When the regulating device needs to be deployed, the processing unit controls the output shaft of the servo motor to reverse through the switch, the driving wheel drives the first ring to rotate in the opposite direction, the twelve sliding shafts slide in the strip groove in the direction away from the axis of the second ring, the twelve rotating plates rotate in the direction away from the axis of the second ring with the fixed axis as the center, the twelve rotating plates rotate outward and deploy, the elastic potential energy of the elastic tube itself is restored to make the elastic tube dilate, and the cross section of the elastic tube through which the liquid flows increases;

[0031] The elastic tube comprises an inner layer, a middle layer and an outer layer from the inside to the outside. The inner layer is made of EPDM rubber, which has good corrosion resistance and can avoid damage from highly corrosive liquids. The middle layer is a nylon rope reinforcement layer, which can improve the structural strength of the elastic tube. The outer layer is natural rubber, which slows down the wear speed of the outer surface of the elastic tube caused by the rotational friction of the rotating plate.

[0032] The present invention has the following beneficial effects:

[0033] 1. The detection terminals are calibrated in series one by one. The weight value β gradually decreases. The later the detection terminal is, the smaller the adjustment range is. Theoretically, the larger the number n of detection terminals is, the more accurate the detected flow information is. Under the premise that there are no components in the pipeline, the detection accuracy of the fluid flow in the pipeline is improved.

[0034] 2. By setting the unit time t, each detection terminal can dynamically adjust the cross-sectional state α in real time. Real-time update can enable the detection terminal to maintain detection accuracy in the case of mixed fluids.

[0035] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0037] Figure 1This is a system block diagram of a high-precision liquid flow detection device of the present invention;

[0038] Figure 2 is a system block diagram of a detection terminal of the present invention;

[0039] Figure 3 It is a structural schematic diagram of the detection terminal of the present invention;

[0040] Figure 4 It is a schematic structural diagram of the second ring and the rotating sheet of the present invention;

[0041] Figure 5 It is a schematic structural diagram of the first ring of the present invention;

[0042] Figure 6 It is a schematic diagram of the structure when the rotating piece of the present invention is closed inwardly;

[0043] Figure 7 It is a schematic diagram of the structure when the rotating piece of the present invention is unfolded outward.

[0044] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0045] In the figure: 1-flange, 2-tube body, 3-fixed plate, 4-adjusting device, 5-servo motor, 6-driving wheel, 7-elastic tube, 8-ultrasonic flow sensor, 41-first circular ring, 42-second circular ring, 43-fixed shaft, 44-rotating plate, 45-sliding shaft, 46-strip groove. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] See also Figure 1-7 The present invention provides a technical solution: a high-precision liquid flow detection method and device, which is implemented based on a processing unit, a switch and n detection terminals, wherein an ultrasonic flow sensor 8, a servo motor 5 and an adjustment device 4 are respectively provided in the detection terminal, and comprises the following steps:

[0048] Step 1: Manually connect n detection terminals in series, the processing unit numbers the detection terminals in sequence according to the series connection order, and manually connect the first and last detection terminals in series to the pipeline to be detected. The manual operation is performed by on-site staff;

[0049] Step 2: With vertical downward as the reference line, manually adjust the installation position of the ultrasonic flow sensor 8 so that the angle between the installation position of the ultrasonic flow sensor 8 and the reference line is a multiple of the angle θ. The angle between the installation position of the ultrasonic flow sensor 8 in the first detection terminal and the reference line is θ, marked as θ1, and the angle between the installation position of the ultrasonic flow sensor 8 in the second detection terminal and the reference line is 2 times θ, marked as θ2, and so on. The size of the angle θ is 180° / n. The size of the angle θ depends on the number n of the detection terminals. Manually input the angle θ corresponding to each input detection terminal into the processing unit. The processing unit binds the angle θ to the number of each detection terminal. Manually measure the inner diameter r of the detected pipeline, and manually input the inner diameter r into the processing unit.

[0050] Step 3: The processing unit sends an initialization instruction to the switch, and the switch forwards the initialization instruction to all detection terminals. Each detection terminal executes the initialization program. The processing unit presets the cross-sectional state α, and the value range of the cross-sectional state α is 0.01-0.99;

[0051] Step 4: The processing unit presets a weight sequence, the number of ranks in the weight sequence is consistent with the number n of detection terminals, each rank in the weight sequence is arranged from large to small according to the weight value β, each rank in the weight sequence is sequentially bound to the detection terminal, and the binding order is the order in which the detection terminals are connected in series, and the sum of the weight values ​​β of all ranks in the weight sequence is 1;

[0052] Step 5: When the liquid is a single fluid medium, the fluid density of the liquid is in a constant state, and the liquid is manually input into the processing unit as a single fluid medium, and the processing unit executes a static calibration program to obtain the first flow information Ψ1 of the single fluid;

[0053] Step 6: When the liquid is a mixed fluid medium, the fluid density of the liquid is in a fluctuating state, and the liquid is manually input into the processing unit as a mixed fluid medium. The processing unit executes a dynamic calibration program to obtain the second flow information Ψ2 of the mixed fluid.

[0054] The initialization procedure specifically includes the following steps:

[0055] The initialization instruction is forwarded by the switch to the servo motor 5 of each detection terminal. The servo motor 5 drives the adjustment device 4 to expand to the maximum amplitude. The processing unit records the rotation angle of the output shaft of the servo motor 5. The servo motor 5 drives the adjustment device 4 to close to the minimum amplitude. The processing unit records the rotation angle of the output shaft of the servo motor 5. When the adjustment device 4 is expanded to the maximum amplitude, the cross-sectional state α is assigned a value of 0.01. When the adjustment device 4 is closed to the minimum amplitude, the cross-sectional state α is assigned a value of 0.99. The processing unit assigns a value to the cross-sectional state α according to the rotation angle of the output shaft of the servo motor 5.

[0056] Among them, the static calibration program specifically includes the following steps:

[0057] Step 501: The processing unit randomly assigns a cross-sectional state α to each detection terminal. The processing unit converts the assigned cross-sectional state α into a control instruction and transmits it to the servo motor 5 of the corresponding detection terminal. The servo motor 5 rotates its output shaft to the corresponding angle according to the control instruction, and the servo motor 5 drives the adjusting device 4 to expand or close to the size specified by the control instruction;

[0058] Step 502: The ultrasonic flow sensor 8 obtains the flow velocity information v at its location and transmits it to the processing unit through the switch;

[0059] Step 503: The processing unit calculates the error index λ between the first detection terminal and the second detection terminal according to the formula where α1 is the cross-sectional state of the first detection terminal, α2 is the cross-sectional state of the second detection terminal, β1 is the weight value of the first detection terminal in the weight sequence, β2 is the weight value of the second detection terminal in the weight sequence, v1 is the flow velocity information obtained by the ultrasonic flow sensor 8 in the first detection terminal, v2 is the flow velocity information obtained by the ultrasonic flow sensor 8 in the second detection terminal, θ1 is the angle between the ultrasonic flow sensor 8 in the first detection terminal and the reference line, and θ2 is the angle between the ultrasonic flow sensor 8 in the second detection terminal and the reference line. If λ - 2 > β2, it means that the detection accuracy error of the second detection terminal is relatively large and does not meet the detection requirements. The processing unit reduces the cross-sectional state α of the second detection terminal by and repeats step 503 again, where n is the number of series-connected detection terminals, m is the number of times of repeating step 503 and 2m < n. When step 503 is repeated 1 time, the cross-sectional state α is reduced by When step 503 is repeated 2 times, the cross-sectional state α is reduced by and so on. On the contrary, if λ - 2 ≤ β2, it means that the detection accuracy error of the second detection terminal is relatively small and meets the detection requirements. The processing unit executes the next step;

[0060] Step 504: The processing unit calculates the error index λ between each detection terminal in turn according to the process of step 503. The calculation order is in the order of the series connection of the detection terminals. The processing unit calculates the error index λ between the second detection terminal and the third detection terminal. If λ - 2 > β3, the processing unit reduces the cross-sectional state α of the second detection terminal by and executes step 503 again. On the contrary, if λ - 2 ≤ β3, the processing unit calculates the error index λ between the subsequent third detection terminal and the fourth detection terminal, and so on, until the error index λ between all detection terminals is completely calculated in a loop;

[0061] Step 505: The processing unit calculates the The flow rate Q of each detection terminal is calculated, and the processing unit calculates the average value of the flow rate Q corresponding to all the detection terminals to obtain the first flow rate information Ψ1. The first flow rate information Ψ1 is the flow rate information of a single fluid in the currently detected pipeline. The detection terminals are calibrated in sequence in a series manner, and the weight value β gradually decreases. The later the detection terminal is, the smaller the adjustment amplitude is. In theory, the larger the number n of detection terminals is, the more accurate the detected flow rate information is, and the detection accuracy of the fluid flow in the pipeline is improved under the premise that there are no moving parts in the pipeline.

[0062] The dynamic calibration procedure specifically includes the following steps:

[0063] Step 601: The processing unit presets a unit time t, and the processing unit Calculate the specific value of the unit time t, Ψ1 is the first flow information, w1 and w2 are proportional coefficients, w1 and w2 are determined according to the proportion between the mixed fluids, and vp is the average value of the flow rate information v obtained by all ultrasonic flow sensors 8;

[0064] Step 602: Every unit time t, the processing unit transmits the cross-sectional state α of each detection terminal to the last connected detection terminal in the reverse order of the liquid flow direction, the original cross-sectional state α of the fourth detection terminal is transmitted to the third detection terminal, the original cross-sectional state α of the third detection terminal is transmitted to the second detection terminal, and so on, the cross-sectional state α of the first detection terminal is transmitted to the last detection terminal;

[0065] Step 603: when the cross-sectional states α of all detection terminals change uniformly, the processing unit executes a static calibration procedure, and when the static calibration procedure is executed, the cross-sectional states α of the detection terminals change in sequence according to the series connection order;

[0066] Step 604: the processing unit counts the first flow information Ψ1 within each unit time t, calculates the average value of the first flow information Ψ1 of all unit times t to obtain the second flow information Ψ2, and the second flow information Ψ2 is the flow information of the mixed fluid in the detected pipeline.

[0067] A high-precision detection device for liquid flow, such as Figure 3-7As shown, it includes a processing unit, a switch and n detection terminals, the detection terminal includes two flanges 1, the opposite sides of the two flanges 1 are connected with a pipe body 2, the opposite sides of the two flanges 1 are respectively connected with the detected pipeline or other detection terminals through bolts, the opposite sides of the two pipe bodies 2 are connected with elastic tubes 7, the bottom of one of the pipe bodies 2 is fixedly connected with a fixing plate 3 through bolts, one side of the fixing plate 3 is fixedly connected with an adjusting device 4, the top of the other pipe body 2 is fixedly connected with a servo motor 5, one end of the output shaft of the servo motor 5 is fixedly connected with a driving wheel 6, the side surface of the driving wheel 6 is transmission-connected with the side surface of the adjusting device 4, and the inner surface of the adjusting device 4 is connected with the side surface of the adjusting device 4. The elastic tube 7 is in contact with the side surface thereof. When the regulating device 4 is gradually closed, the elastic tube 7 is squeezed inside the regulating device 4 so that the elastic tube 7 contracts, and the cross-section of the liquid flowing inside the elastic tube 7 is reduced. When the regulating device 4 is gradually expanded, the elastic potential energy of the elastic tube 7 is restored so that the elastic tube 7 is relaxed, and the cross-section of the liquid flowing inside the elastic tube 7 is increased. An ultrasonic flow sensor 8 is fixedly connected to the side surface of the elastic tube 7 near the fixed plate 3. The ultrasonic flow sensor 8 can be installed at any angle of the elastic tube 7, and can be installed at the top of the elastic tube 7 near the fixed plate 3, or at the bottom of the elastic tube 7 near the fixed plate 3. Figure 3 As shown;

[0068] The adjusting device 4 includes a first circular ring 41 and a second circular ring 42. The side surface of the first circular ring 41 is transmission-connected to the side surface of the driving wheel 6. The side surface of the second circular ring 42 is fixedly connected to the fixed plate 3. Twelve fixed shafts 43 are fixedly connected to the side of the second circular ring 42 away from the fixed plate 3. The fixed shafts 43 are evenly distributed on the surface of the second circular ring 42 in an annular shape. A rotating piece 44 is rotatably connected to the side surface of the fixed shaft 43. The rotating piece 44 has an arc-shaped structure. A sliding shaft 45 is fixedly connected to one side of the rotating piece 44. The inner surface of the first circular ring 41 is rotatably connected to the side surface of the second circular ring 42. Twelve strip grooves 46 are opened on the surface of the first circular ring 41. The strip grooves 46 are evenly distributed on the surface of the first circular ring 41 in an annular shape. The side surface of the sliding shaft 45 is slidably connected to the inner surface of the strip grooves 46.

[0069] like Figure 1-2 As shown, the port of the processing unit is connected to the switch, the port of each detection terminal is connected to the port of the switch, the output end of the switch is connected to the input end of the servo motor 5, the processing unit controls the forward and reverse rotation of the output shaft of the servo motor 5 through the switch, the output end of the ultrasonic flow sensor 8 is connected to the input end of the switch, the ultrasonic flow sensor 8 obtains the flow rate information v of the liquid flowing through the elastic tube 7 in real time and transmits it to the switch, and the switch forwards the received flow rate information v to the processing unit.

[0070] The specific steps of the closing and unfolding process of the adjusting device 4 are as follows:

[0071] When the regulating device 4 needs to be closed, the processing unit sends a control instruction to the servo motor 5 through the switch, the output shaft of the servo motor 5 rotates to drive the driving wheel 6 to rotate, the driving wheel 6 rotates to drive the first ring 41 to rotate, the twelve sliding shafts 45 slide in the strip groove 46 toward the axis of the second ring 42, and the twelve rotating pieces 44 rotate toward the axis of the second ring 42 with the fixed shaft 43 as the center. Figure 6 As shown, the rotation of the twelve rotating pieces 44 will squeeze the sides of the elastic tube 7 so that the elastic tube 7 contracts, and the cross section of the elastic tube 7 through which the liquid flows is reduced;

[0072] When the adjusting device 4 needs to be deployed, the processing unit controls the output shaft of the servo motor 5 to reverse through the switch, the driving wheel 6 drives the first ring 41 to rotate in the opposite direction, the twelve sliding shafts 45 slide in the strip groove 46 in the direction away from the axis of the second ring 42, and the twelve rotating pieces 44 rotate in the direction away from the axis of the second ring 42 with the fixed shaft 43 as the center. Figure 7 As shown, the twelve rotating pieces 44 rotate outward and expand, and the elastic potential energy of the elastic tube 7 is restored to make the elastic tube 7 expand, and the cross-section of the elastic tube 7 flowing through the liquid increases. The processing unit can directly determine the size of the closing and expansion of the twelve rotating pieces 44 by controlling the rotation angle of the output shaft of the servo motor 5, and synchronously change the cross-sectional size of the elastic tube 7. Figure 3 As shown, the flow direction of the liquid inside the tube body 2 is from left to right. At this time, the installation position of the ultrasonic flow sensor 8 is located behind the adjustment device 4. After the adjustment device 4 changes the size of the internal cross-section of the elastic tube 7, the ultrasonic flow sensor 8 can immediately obtain the change of the flow velocity information v of the liquid inside the elastic tube 7;

[0073] The elastic tube 7 is composed of an inner layer, a middle layer and an outer layer from the inside to the outside. The inner layer is made of EPDM rubber, which has good corrosion resistance and can avoid damage from highly corrosive liquids. The middle layer is a nylon rope reinforcement layer, which can improve the structural strength of the elastic tube 7. The outer layer is natural rubber, which slows down the wear rate of the outer surface of the elastic tube 7 caused by the rotational friction of the rotating plate 44.

[0074] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-precision liquid flow detection method, based on a processing unit, a switch and n detection terminals, wherein the detection terminals are respectively provided with an ultrasonic flow sensor (8), a servo motor (5) and an adjustment device (4), wherein the adjustment device (4) changes the internal cross-sectional size of an elastic tube (7), and wherein: The following steps are involved: Step 1: connect n detection terminals in series in pairs, the processing unit numbers the detection terminals in sequence according to the series connection order, and connect the first and the last detection terminals in series to the pipeline to be detected; Step 2: With vertical downward as a reference line, adjust the installation position of the ultrasonic flow sensor (8), the angle between the installation position of the ultrasonic flow sensor (8) and the reference line is a multiple of the angle θ, the angle θ corresponding to each input detection terminal is input into the processing unit, and is bound to the number of each detection terminal, the inner diameter r of the detected pipe is measured, and the inner diameter r is input into the processing unit; Step 3: The processing unit sends an initialization instruction to the switch, and the switch forwards the initialization instruction to all detection terminals. Each detection terminal executes the initialization program, and the processing unit presets the cross-sectional state α; Step 4: The processing unit presets a weight sequence, the number of ranks in the weight sequence is consistent with the number n of detection terminals, each rank in the weight sequence is arranged from large to small according to the weight value β, and each rank in the weight sequence is bound to the detection terminal in turn, and the binding order is the order in which the detection terminals are connected in series; Step 5: When the liquid is a single fluid medium, manually input the liquid as a single fluid medium into the processing unit, and execute the static calibration program to obtain the first flow information Ψ1 of the single fluid; Step 6: When the liquid is a mixed fluid medium, the liquid is manually input into the processing unit as a mixed fluid medium, and a dynamic calibration program is executed to obtain the second flow information Ψ2 of the mixed fluid. Every unit time t, each detection terminal can dynamically adjust the cross-sectional state α; The initialization procedure specifically includes the following steps: The initialization command is forwarded by the switch to the servo motor (5) of each detection terminal. The servo motor (5) drives the adjustment device (4) to expand to the maximum amplitude. The processing unit records the rotation angle of the output shaft of the servo motor (5). The servo motor (5) drives the adjustment device (4) to close to the minimum amplitude. The rotation angle of the output shaft of the servo motor (5) is recorded. When the adjustment device (4) is expanded to the maximum amplitude, the cross-sectional state α is assigned a value of 0.

01. When the adjustment device (4) is closed to the minimum amplitude, the cross-sectional state α is assigned a value of 0.

99. The cross-sectional state α is assigned a value according to the rotation angle of the output shaft of the servo motor (5).

2. A high-precision detection method for liquid flow according to claim 1, characterized in that: The specific steps of the closing and unfolding process of the regulating device (4) are as follows: When the regulating device (4) needs to be closed, the processing unit sends a control instruction to the servo motor (5) through the switch, the output shaft of the servo motor (5) rotates to drive the driving wheel (6) to rotate, the driving wheel (6) rotates to drive the first ring (41) to rotate, the twelve sliding shafts (45) slide in the strip groove (46) towards the axis of the second ring (42), the twelve rotating plates (44) rotate towards the axis of the second ring (42) with the fixed shaft (43) as the center, the rotation of the twelve rotating plates (44) squeezes the side surface of the elastic tube (7) so that the elastic tube (7) contracts, and the cross section of the elastic tube (7) through which the liquid flows is reduced; When the adjustment device (4) needs to be deployed, the processing unit controls the output shaft of the servo motor (5) to reverse through the switch, the driving wheel (6) drives the first ring (41) to rotate in the opposite direction, the twelve sliding shafts (45) slide in the strip groove (46) in a direction away from the axis of the second ring (42), the twelve rotating plates (44) rotate in a direction away from the axis of the second ring (42) with the fixed shaft (43) as the center, the twelve rotating plates (44) rotate outward to deploy, the elastic potential energy of the elastic tube (7) itself is restored so that the elastic tube (7) is dilated, and the inside of the elastic tube (7) is The cross section through which the liquid flows increases. The processing unit can directly determine the size of the closing and unfolding of the twelve rotating plates (44) by controlling the rotation angle of the output shaft of the servo motor (5), and synchronously change the cross section size inside the elastic tube (7). The flow direction of the liquid inside the tube body (2) is from left to right. At this time, the installation position of the ultrasonic flow sensor (8) is located behind the adjustment device (4). After the adjustment device (4) changes the cross section size inside the elastic tube (7), the ultrasonic flow sensor (8) can immediately obtain the change of the flow rate information v of the liquid inside the elastic tube (7).

3. A high-precision liquid flow detection method according to claim 1, characterized in that: The static calibration procedure specifically includes the following steps: Step 501: The processing unit randomly assigns a value to the cross-sectional state α of each detection terminal, converts the assigned cross-sectional state α into a control instruction and transmits it to the servo motor (5) of the corresponding detection terminal. The servo motor (5) rotates its output shaft to a corresponding angle according to the control instruction, and the servo motor (5) drives the adjustment device (4) to close to the size specified by the control instruction. Step 502: The ultrasonic flow sensor (8) obtains flow velocity information v at the location and transmits it to the processing unit through the switch; Step 503: According to the formula calculate the error index λ between the first detection terminal and the second detection terminal, where α1 is the cross-sectional state of the first detection terminal, α2 is the cross-sectional state of the second detection terminal, β1 is the weight value of the first detection terminal in the weight sequence, β2 is the weight value of the second detection terminal in the weight sequence, v1 is the flow velocity information obtained by the first ultrasonic flow sensor (8), v2 is the flow velocity information obtained by the second ultrasonic flow sensor (8), θ1 is the angle between the first ultrasonic flow sensor (8) and the reference line, θ2 is the angle between the second ultrasonic flow sensor (8) and the reference line. If λ - 2 > β2, reduce the cross-sectional state α of the second detection terminal by , and repeat step 503 again, where n is the number of series-connected detection terminals, m is the number of times of repeatedly executing step 503 and 2m < n. Conversely, if λ - 2 ≤ β2, execute the next step; Step 504: Calculate the error index λ between each detection terminal in turn. The calculation order is in the order in which the detection terminals are connected in series. Calculate the error index λ between the second detection terminal and the third detection terminal. If λ-2>β3, reduce the cross-sectional state α of the second detection terminal by Step 503 is executed again. Otherwise, if λ-2≤β3, the error index λ between the third detection terminal and the fourth detection terminal is calculated, and so on, until the error indexes λ between all detection terminals are completely calculated in a loop; Step 505: According to the formula The flow rate Q of each detection terminal is calculated, and the average value of the flow rates Q corresponding to all detection terminals is calculated to obtain the first flow rate information Ψ1, which is the flow rate information of a single fluid in the currently detected pipeline; The dynamic calibration procedure specifically includes the following steps: Step 601: The processing unit presets a unit time t, according to Calculate the specific value of the unit time t, Ψ1 is the first flow information, w1 and w2 are proportional coefficients, w1 and w2 are determined according to the proportion of the mixed fluid, and vp is the average value of the flow rate information v obtained by all ultrasonic flow sensors (8); Step 602: Every unit time t, the cross-sectional state α of each detection terminal is transmitted to the last connected detection terminal in the reverse order of the liquid flow direction, the original cross-sectional state α of the fourth detection terminal is transmitted to the third detection terminal, the original cross-sectional state α of the third detection terminal is transmitted to the second detection terminal, and so on, the cross-sectional state α of the first detection terminal is transmitted to the last detection terminal; Step 603: When the cross-sectional states α of all detection terminals change uniformly, a static calibration procedure is executed. When the static calibration procedure is executed, the cross-sectional states α of the detection terminals change in sequence according to the series connection order. Step 604: the processing unit counts the first flow information Ψ1 within each unit time t, calculates the average value of the first flow information Ψ1 of all unit times t to obtain the second flow information Ψ2, and the second flow information Ψ2 is the flow information of the mixed fluid in the detected pipeline.

4. A high-precision liquid flow detection device, characterized in that A high-precision liquid flow detection method applied to any one of claims 1 to 3, comprising a processing unit, a switch and n detection terminals, wherein the detection terminals comprise two flanges (1), wherein opposite sides of the two flanges (1) are connected to a tube body (2), and opposite sides of the two flanges (1) are respectively connected to a detected pipeline or other detection terminals via bolts, and opposite sides of the two tube bodies (2) are connected to elastic tubes (7), wherein the bottom of one of the tube bodies (2) is fixedly connected to a fixing plate (3) via bolts, and one side of the fixing plate (3) is fixedly connected to an adjusting device (4), and the top of the other tube body (2) is fixedly connected to a fixing plate (3) via bolts. A servo motor (5) is fixedly connected to the servo motor (5), one end of the output shaft of the servo motor (5) is fixedly connected to a driving wheel (6), the peripheral side of the driving wheel (6) is drivingly connected to the peripheral side of the adjusting device (4), the inner surface of the adjusting device (4) is in contact with the peripheral side of the elastic tube (7), when the adjusting device (4) is closed, the elastic tube (7) is squeezed inside the adjusting device (4) so ​​that the elastic tube (7) contracts, when the adjusting device (4) is expanded, the elastic potential energy of the elastic tube (7) is restored so that the elastic tube (7) expands, and an ultrasonic flow sensor (8) is fixedly connected to the peripheral side of the elastic tube (7) close to the fixed plate (3); The adjusting device (4) comprises a first circular ring (41) and a second circular ring (42), wherein the circumferential side surface of the first circular ring (41) is transmission-connected to the circumferential side surface of the driving wheel (6), and the circumferential side surface of the second circular ring (42) is fixedly connected to the fixed plate (3). A plurality of fixed shafts (43) are fixedly connected to the side of the second circular ring (42) away from the fixed plate (3), and the fixed shafts (43) are evenly distributed on the surface of the second circular ring (42) in an annular shape. A rotating sheet (44) is rotatably connected to the circumferential side surface of the fixed shaft (43), and the rotating sheet (44) has an arc-shaped structure. A sliding shaft (45) is fixedly connected to one side of the rotating sheet (44), and the inner surface of the first circular ring (41) is rotatably connected to the circumferential side surface of the second circular ring (42). A plurality of strip grooves (46) are provided on the surface of the first circular ring (41), and the strip grooves (46) are evenly distributed on the surface of the first circular ring (41) in an annular shape. The circumferential side surface of the sliding shaft (45) is slidably connected to the inner surface of the strip grooves (46). The port of the processing unit is connected to the switch, the port of each detection terminal is connected to the port of the switch, the output end of the switch is connected to the input end of the servo motor (5), the processing unit controls the forward and reverse rotation of the output shaft of the servo motor (5) through the switch, the output end of the ultrasonic flow sensor (8) is connected to the input end of the switch, the ultrasonic flow sensor (8) obtains flow velocity information v of the liquid flowing through the elastic tube (7) in real time and transmits it to the switch, and the switch forwards the received flow velocity information v to the processing unit.

5. A high-precision liquid flow detection device according to claim 4, characterized in that: The elastic tube (7) comprises an inner layer, a middle layer and an outer layer from the inside to the outside, the inner layer is made of EPDM rubber, the middle layer is a nylon rope reinforcement layer, and the outer layer is natural rubber.

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