Non-destructive installation fluid viscosity and flow velocity online detection device and method

Abstract

The invention discloses a non-destructive installation fluid viscosity and flow velocity on-line detection device and a non-destructive installation fluid viscosity and flow velocity on-line detection method. The device comprises a container and two signal receiving and transmitting units, the container is a pipeline filled with fluid to be detected or a tank body used for storing the fluid to be detected, and the two signal receiving and transmitting units are arranged on the surface of the outer wall at intervals in the axial direction of the container; the method comprises the following steps: selecting an excitation frequency; when no fluid to be detected exists in a container, measuring a reference signal; when the fluid to be detected is filled into the container, measuring a liquid filling detection signal; solving the fluid viscosity according to the relationship between the attenuation rate of a guided wave signal and the fluid viscosity, and solving the fluid flow velocity according to the relationship between the guided wave group velocity and the fluid flow velocity. The problems that a multi-interval sampling detection mode is tedious, and the real-time performance is poor are solved, the defect that an immersion type detection unit needs to perform trepanning or design changing on an original container or pipeline structure is overcome, meanwhile, the flow velocity detection capacity is achieved, and the purpose of fluid viscosity and flow velocity online detection of non-destructive installation can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of fluid viscosity and flow rate measurement, and specifically to a non-destructively installed fluid viscosity and flow rate online detection device and method. Background Art

[0002] For fluid viscosity, current measurement methods mainly include capillary method, rotation method, falling ball method and vibration method. In actual industrial applications, no matter which viscometer based on the above principle is used, it is necessary to sample at multiple time intervals and perform offline testing, or design an immersion detection module for online detection. However, the offline detection cycle is long, the real-time performance is poor, and the accuracy is easily affected by factors such as the operation process and the level of the detection personnel; the online immersion detection has the problems of high design cost, destructive installation, and inconvenient maintenance and replacement. The invention patent of CN115266472A designs a built-in online viscosity measuring device, which fixes the viscometer on the mounting seat in the gear box above the stirring tank for viscosity measurement in the field of material mixing. Although the invention achieves the purpose of online detection, it places the viscometer inside the container in direct contact with the fluid, which belongs to immersion detection, which is relatively prone to failure and damage, and inconvenient maintenance and replacement; at the same time, the invention needs to redesign and replace the structure of the existing container and equipment, which is costly and has limited general applicability.

[0003] For fluid flow rate, currently commonly used equipment includes Coriolis flowmeter, differential pressure flowmeter, electromagnetic flowmeter, vortex flowmeter and ultrasonic flowmeter, among which only electromagnetic flowmeter and ultrasonic flowmeter can theoretically realize non-immersion measurement. However, electromagnetic flowmeter can only measure conductive fluid, and its application scope is relatively small; the non-immersion installation method of ultrasonic flowmeter will cause problems such as sound wave deflection and energy loss, which will affect the measurement accuracy, so the immersion installation method is often used in practice. The invention patent CN110658357A designs an ultrasonic Doppler pipeline flow rate measurement device for the field of pipeline transportation technology of petroleum engineering. Based on the principle that the sound wave reflection signal is affected by the movement of the fluid to produce frequency deviation, it realizes accurate and rapid flow rate detection in the pipe, but it still belongs to immersion detection, and the original pipeline structure needs to be changed and designed, and it does not have the advantages of non-destructive installation and non-immersion measurement.

[0004] In summary, there is currently no detection method that can achieve simultaneous measurement of fluid viscosity and flow rate under the conditions of non-destructive installation and online detection. Therefore, the development of a fast, online, non-destructive viscosity and flow rate detection technology is of great significance and practical application value. Ultrasonic guided waves are a long-distance non-destructive detection technology widely used in pipes, rails and other workpieces. Because of its characteristics that its propagation is easily affected by the surrounding medium, it has attracted attention in the field of viscosity and flow rate measurement in recent years. Summary of the invention

[0005] In view of the problems existing in measuring fluid viscosity in the background technology, the purpose of the present invention is to provide a non-destructively installed fluid viscosity and flow velocity online detection device and method, which excites a waveguide signal in the container wall, utilizes the correlation between the propagation attenuation of the waveguide signal on the container wall and the fluid viscosity, and the correlation between the waveguide group velocity and the fluid flow velocity, and obtains and processes the attenuation rate of the waveguide signal and the waveguide group velocity, so as to realize non-destructively installed fluid viscosity and flow velocity online detection.

[0006] The present invention is achieved through the following technical solutions:

[0007] 1. A non-destructive online detection device for fluid viscosity and flow rate

[0008] It includes a container and two signal transceiver units;

[0009] The container is a pipe filled with the fluid to be measured or a tank for storing the fluid to be measured, and the two signal transceiver units are arranged on the outer wall surface along the axial direction of the container at intervals;

[0010] The two signal transceiver units are respectively a signal transceiver unit I and a signal transceiver unit II, both of which are used to excite or receive waveguide signals.

[0011] Each signal transceiver unit includes a coil assembly and a magnetostrictive transducer material;

[0012] The magnetostrictive transducing material is arranged along the circumference of the outer wall of the container, the coil group includes two coils, the two coils are arranged in an axial direction of the container at intervals, each coil is arranged on the magnetostrictive transducing material along the circumference of the outer wall of the container, and the magnetostrictive transducing material is kept in contact with the two coils;

[0013] The magnetostrictive transducing materials of the two signal transceiver units are arranged along a straight line parallel to the axial direction of the container.

[0014] It also includes a control module, a waveguide excitation module, a pulse generation module, a power amplification module, an echo receiving module, a preamplifier, a data acquisition module, a switching module and a display module;

[0015] The switching module is electrically connected to the signal transceiver unit I and the signal transceiver unit II respectively. The switching module is electrically connected to the control module via the echo receiving module, the preamplifier, and the data acquisition module in sequence. The control module is electrically connected to the switching module via the waveguide excitation module, the pulse generating module, and the power amplification module in sequence. The control module is electrically connected to the display module.

[0016] The material of the magnetostrictive transducer material includes but is not limited to magnetic conductive materials such as nickel, iron, iron-nickel alloy, iron-aluminum alloy and iron-cobalt alloy.

[0017] 2. A non-destructive online detection method for fluid viscosity and flow rate

[0018] 1) Select the guided wave mode dominated by in-plane displacement as the excitation mode, calculate the guided wave dispersion curve of the container according to the structural geometric parameters and material mechanical characteristics of the container, and select the excitation frequency according to the guided wave dispersion curve;

[0019] 2) When there is no fluid to be measured in the container, the signal transceiver unit I is controlled as the transmitting end and the signal transceiver unit II is controlled as the receiving end. The signal transceiver unit I sends a waveguide signal that propagates along the outer wall of the container and is received by the signal transceiver unit II. The waveguide signal received by the signal transceiver unit II is used as the reference signal w0;

[0020] 3) Fill the container with a fluid to be tested with a viscosity of η. In the same manner as step 2), the waveguide signal received by the signal transceiver unit II is used as the first liquid filling detection signal w. The corresponding attenuation rate y is obtained by combining the reference signal w0 in step 2). The viscosity x of the fluid to be tested is obtained according to the attenuation rate y combined with the pre-calibrated fitting curve, thereby realizing online detection of the fluid viscosity.

[0021] 4) calculating the first signal delay t1 according to the waveguide signal excited by the signal transceiver unit I and the waveguide signal received by the signal transceiver unit II in step 3);

[0022] 5) The switching module adjusts the signal transceiver unit circuit so that the signal transceiver unit II and the signal transceiver unit I exchange transmission and reception, that is, the signal transceiver unit II is used as the transmitting end and the signal transceiver unit I is used as the receiving end. In the same manner as step 2), the waveguide signal received by the signal transceiver unit I is used as the second liquid filling detection signal w′;

[0023] 6) calculating the second signal delay t2 according to the waveguide signal excited by the signal transceiver unit II and the waveguide signal received by the signal transceiver unit I in step 5);

[0024] 7) According to the first and second signal delays t1 and t2 obtained in steps 4) and 6), the velocity fitting coefficient ε is obtained in combination with the pre-calibrated fitting curve, and the flow velocity v of the fluid to be measured is calculated according to the flow velocity fitting coefficient ε to realize online detection of the fluid flow velocity.

[0025] In step 3), the attenuation rate y is calculated according to the following formula:

[0026]

[0027] Wherein, d is the spacing distance between the signal transceiver unit I and the signal transceiver unit II, w0 represents the reference signal when there is no fluid to be tested in step 2), w represents the first filling detection signal, U(*) represents the amplitude, and y represents the attenuation rate.

[0028] In step 3), the formula of the pre-calibrated fitting curve of the viscosity x of the fluid to be measured is:

[0029] y=ax b +c

[0030] Where y represents the attenuation rate, x represents the viscosity of the fluid to be measured, and a, b and c are all viscosity fitting coefficients.

[0031] In step 4) and step 6), the calculation method of the first and second signal delays t1 and t2 includes but is not limited to the correlation function method.

[0032] In step 7), the flow rate fitting coefficient ε is obtained according to the following pre-calibrated fitting curve:

[0033] v g (v) = v g0 +εv

[0034] Where v represents the flow rate of the fluid to be measured, v g (v) represents the function of guided wave group velocity with respect to fluid velocity, v g0 It represents the guided wave group velocity when the fluid velocity is 0, and ε represents the velocity fitting coefficient.

[0035] In step 7), the flow rate v of the fluid to be measured is obtained by processing according to the following formula:

[0036]

[0037] Wherein v represents the flow velocity of the fluid to be measured, d represents the interval distance between the signal transceiver unit I and the signal transceiver unit II, t1 represents the signal delay when the signal transceiver unit I is used as the excitation unit, t2 represents the signal delay when the signal transceiver unit II is used as the excitation unit, and ε represents the flow velocity fitting coefficient.

[0038] The basic principle of the present invention is to place a magnetostrictive waveguide transducer on the outer wall of the container, and to excite a waveguide mode dominated by in-plane displacement on the wall surface based on the magnetostrictive effect. Due to the effect of fluid viscosity, part of the waveguide signal will leak into the fluid during its propagation, thereby causing the attenuation of the waveguide signal during the propagation process; and due to the effect of the fluid flow rate, there is an approximately linear relationship between the waveguide group velocity and the fluid flow rate. Therefore, by using the attenuation rate of the waveguide signal and the waveguide group velocity, the relationship between the attenuation rate of the waveguide signal and the fluid viscosity can be established, and at the same time, the relationship between the waveguide group velocity and the fluid flow rate can be established. Compared with the existing fluid viscosity and flow rate measurement method, it has the characteristics of non-destructive, non-contact online detection, simple and convenient operation, and can achieve simultaneous measurement of fluid viscosity and flow rate.

[0039] The innovation of the present invention lies in the structural characteristics of directly arranging the signal transceiver unit on the outer wall of the container and using the switching module to exchange the transmission and reception to calculate the signal delay, and using the attenuation rate of the waveguide signal and the waveguide group velocity to establish the relationship between the attenuation rate of the waveguide signal and the viscosity of the fluid, and the method processing characteristics of the relationship between the waveguide group velocity and the fluid flow rate, which brings the beneficial effects of not needing to open holes or change the design of the original container structure, and not needing to perform sampling type detection, and realizes the advantage of simultaneously measuring the viscosity and flow rate of the fluid under the conditions of non-destructive installation, non-immersion and online detection.

[0040] The effective benefits of the present invention are:

[0041] The fluid viscosity is detected by utilizing the correlation between the attenuation rate of the in-plane displacement guided wave signal and the viscosity, and the fluid flow rate is detected by utilizing the correlation between the guided wave group velocity and the fluid flow rate. The signal acquisition is convenient and the data processing is simple. During the detection process, the pipeline filled with the fluid to be tested or the tank body storing the fluid to be tested is used as the carrier. There is no need to open holes or change the design of the original container structure, and there is no need to perform sampling detection. The viscosity, flow rate values ​​and their changes of the fluid to be tested can be displayed and updated in real time on the display module of the host computer. The operation is simple and efficient, and can realize simultaneous online detection of fluid viscosity and flow rate. It can be used for a large number of industrial application scenarios and meet the needs of rapid on-site detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a composition structure diagram of the fluid viscosity and flow rate measuring device;

[0043] Figure 2 It is the empty container detection signal diagram;

[0044] Figure 3 It is the liquid flow detection signal diagram;

[0045] Figure 4 This is a schematic diagram of viscosity calibration;

[0046] Figure 5 This is a flow rate calibration diagram.

[0047] In the figure: 1. container; 2. signal transceiver unit I; 3. signal transceiver unit II; 4. coil; 5. magnetostrictive transducer material; 6. control module; 7. waveguide excitation module; 8. pulse generation module; 9. power amplification module; 10. echo receiving module; 11. preamplifier; 12. data acquisition module; 13. switching module; 14. display module. DETAILED DESCRIPTION

[0048] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0049] like Figure 1As shown, the device includes a container 1 and two signal transceiver units;

[0050] The container 1 is a pipe filled with the fluid to be measured or a tank for storing the fluid to be measured, and the two signal transceiver units are arranged on the outer wall surface along the axial direction of the container 1 at intervals;

[0051] The two signal transceiver units are signal transceiver unit Ⅰ2 and signal transceiver unit Ⅱ3, both of which are used to excite or receive waveguide signals.

[0052] The two signal transceiver units have the same structure, and each signal transceiver unit includes a coil group and a magnetostrictive transducer material 5;

[0053] The magnetostrictive transducing material 5 is arranged along the circumference of the outer wall of the container 1, and the coil group includes two coils 4, and the two coils 4 are arranged at intervals along the axial direction of the container 1, and each coil 4 is arranged on the magnetostrictive transducing material 5 along the circumference of the outer wall of the container 1, and the magnetostrictive transducing material 5 is kept in contact with the two coils 4;

[0054] The magnetostrictive transducer materials 5 of the two signal transceiver units are arranged at intervals along a straight line parallel to the axial direction of the container 1 , ensuring that the transmission distance of the waveguide signal is the interval distance between the two magnetostrictive transducer materials 5 .

[0055] The two signal transceiver units are completely installed or only partially installed along the circumference depending on the size and structure of the container 1. Long-term fixing methods including but not limited to coupling glue can be used, or temporary fixing methods including but not limited to mechanical clamping can be used.

[0056] In the specific implementation, electrical devices are also provided, and the electrical devices include a control module 6, a waveguide excitation module 7, a pulse generation module 8, a power amplification module 9, an echo receiving module 10, a preamplifier 11, a data acquisition module 12, a switching module 13 and a display module 14;

[0057] The switching module 13 is electrically connected to the signal transceiver unit Ⅰ2 and the signal transceiver unit Ⅱ3 respectively. The switching module 13 is electrically connected to the control module 6 via the echo receiving module 10, the preamplifier 11, and the data acquisition module 12 in sequence. The control module 6 is electrically connected to the switching module 13 via the waveguide excitation module 7, the pulse generating module 8, and the power amplification module 9 in sequence. The control module 6 is electrically connected to the display module 14.

[0058] The switching module 13 is a conversion circuit for interchanging the sending and receiving order of the signal sending and receiving unit I2 and the signal sending and receiving unit II3.

[0059] The control module 6 generates an excitation pulse signal, which is converted into an analog signal by the waveguide excitation module 7 and the pulse generation module 8 in sequence, and then input into the signal transceiver unit Ⅰ2 after power amplification by the power amplifier module 9, and then input into the switching module 13. Through the magnetostrictive effect, guided waves such as L(0,2) and T(0,1) with in-plane displacement as the main component are formed, and propagate along the outer wall of the container 1;

[0060] The signal transceiver unit II3 composed of the coil 4 and the magnetostrictive transducer material 5 receives the echo signal, which is received by the switching module 13, the echo receiving module 10, the preamplifier 11, and the data acquisition module 12 in sequence to realize sampling and reception, and then sent to the control module 6 for data processing, attenuation rate calculation and signal delay calculation, wherein the attenuation rate calculation result is combined with the pre-fitting curve and calibration to obtain the viscosity of the fluid to be measured and displayed on the display module 14;

[0061] The signal transceiver unit II3 excites the waveguide signal through the switching module 13, and the signal transceiver unit I2 receives the waveguide signal, excites it again, and calculates the signal delay;

[0062] The flow rate fitting coefficient is obtained by combining two signal delays with a pre-fitted curve and calibration, and the flow rate of the fluid to be measured is calculated according to the flow rate fitting coefficient and displayed on the display module 14 .

[0063] The material of the magnetostrictive transducer material 5 includes, but is not limited to, magnetic conductive materials such as nickel, iron, iron-nickel alloy, iron-aluminum alloy and iron-cobalt alloy.

[0064] The embodiments of the present invention and the steps thereof are as follows:

[0065] 1) Selecting a waveguide mode dominated by in-plane displacement as an excitation mode for detection, the modes include but are not limited to L(0,2), T(0,1), etc. Calculate the waveguide dispersion curve of the container 1 according to the structural geometric parameters and material mechanical characteristics of the container 1, and select the frequency with the smallest dispersion degree as the excitation frequency according to the waveguide dispersion curve;

[0066] 2) When there is no fluid to be measured in the container 1, the excitation signal of the waveguide excitation module 7 is sent to the signal transceiver unit I2 to generate a waveguide signal, and the signal transceiver unit I2 is controlled as the transmitting end and the signal transceiver unit II3 is controlled as the receiving end. The signal transceiver unit I2 is stimulated to send a waveguide signal that propagates along the outer wall of the container 1 and is received by the signal transceiver unit II3. The waveguide signal received by the signal transceiver unit II3 is used as the reference signal w0;

[0067] 3) Fill the container 1 with a fluid to be tested with a viscosity of η. In the same manner as step 2), the waveguide signal received by the signal transceiver unit II3 is used as the first filling detection signal w. The corresponding attenuation rate y is obtained by combining the reference signal w0 in step 2). The viscosity x of the fluid to be tested is obtained according to the attenuation rate y combined with the pre-calibrated fitting curve, thereby realizing online detection of fluid viscosity.

[0068] 4) calculating the first signal delay t1 according to the waveguide signal excited by the signal transceiver unit I2 in step 3) and the waveguide signal received by the signal transceiver unit II3;

[0069] 5) The switching module 13 adjusts the signal transceiver unit circuit so that the signal transceiver unit II3 and the signal transceiver unit I2 exchange transmission and reception, that is, the signal transceiver unit II3 is used as the transmitting end and the signal transceiver unit I2 is used as the receiving end. In the same manner as step 2), the waveguide signal received by the signal transceiver unit I2 is used as the second liquid filling detection signal w′;

[0070] 6) Calculate the second signal delay t2 according to the waveguide signal excited by the signal transceiver unit II3 and the waveguide signal received by the signal transceiver unit I2 in step 5);

[0071] 7) According to the first and second signal delays t1 and t2 obtained in steps 4) and 6), the velocity fitting coefficient ε is obtained in combination with the pre-calibrated fitting curve, and the flow velocity v of the fluid to be measured is calculated according to the flow velocity fitting coefficient ε to realize online detection of the fluid flow velocity.

[0072] In step 3), the attenuation rate y is calculated according to the following formula:

[0073]

[0074] Wherein, d is the spacing distance between the signal transceiver unit I2 and the signal transceiver unit II3, w0 represents the reference signal when there is no fluid to be tested in step 2), w represents the first filling detection signal, U(*) represents the amplitude, and y represents the attenuation rate.

[0075] In step 3), the formula of the pre-calibrated fitting curve of the viscosity x of the fluid to be measured is:

[0076] y=ax b +c

[0077] Where y represents the attenuation rate, x represents the viscosity of the fluid to be measured, and a, b and c are all viscosity fitting coefficients.

[0078] In step 4) and step 6), the calculation method of the first and second signal delays t1 and t2 includes but is not limited to the correlation function method.

[0079] In step 7), the velocity fitting coefficient ε is obtained according to the following pre-calibrated fitting curve:

[0080] v g (v) = v g0 +εv

[0081] Where v represents the flow rate of the fluid to be measured, v g (v) represents the function of guided wave group velocity with respect to fluid velocity, v g0 represents the guided wave group velocity when the fluid velocity is 0, and ε represents the velocity fitting coefficient;

[0082] In step 7), the flow rate v of the fluid to be measured is obtained according to the following formula:

[0083]

[0084] Wherein v represents the flow velocity of the fluid to be measured, d represents the interval distance between the signal transceiver unit Ⅰ2 and the signal transceiver unit Ⅱ3, t1 represents the signal delay when the signal transceiver unit Ⅰ2 is used as the excitation unit, r2 represents the signal delay when the signal transceiver unit Ⅱ3 is used as the excitation unit, and ε represents the flow velocity fitting coefficient.

[0085] In the specific implementation, a steel pipe with a diameter of 300 mm and a wall thickness of 8 mm is selected as the container 1. The iron-cobalt belt is used as the magnetostrictive transducer material 55 and is completely installed along the circumference of the outer wall of the steel pipe. It is fixed with coupling glue, and then a coil is attached to the top of the iron-cobalt belt to form a signal transceiver unit. The two groups of signal transceiver units are 0.3 m apart. When selecting a waveguide mode, a waveguide mode based on in-plane displacement can be selected according to specific needs. In this experiment, L(0,4) is selected as the excitation mode based on the dispersion curve calculation. The excitation frequency corresponding to the excitation area with the smallest dispersion is about 75 kHz.

[0086] When the container 1 is not filled with the fluid to be tested, that is, in the empty tube state, a signal is sent through the control module 6, and after passing through the waveguide excitation module 7, the pulse generation module 8 and the power amplifier module 9, the signal transceiver unit I2 is excited to generate a sinusoidal signal with a center frequency of 75kHz, forming an L(0,4) modal waveguide propagating along the outer wall of the container 1, which is propagated to the signal transceiver unit II3 and received. The received waveguide signal is used as the reference signal q0, as shown in Figure 2 shown.

[0087] When the container 1 is filled with a fluid to be tested with a certain viscosity and flow rate, the waveguide signal is sent and received in the same manner as above. The received signal is as follows: Figure 3 The black signal in the middle is the filling detection signal q. By comparing the reference signal q0 and the first filling detection signal w, it can be seen that the peak amplitude of the first filling detection signal w is about 0.804 of the reference signal w0. The corresponding attenuation rate y=0.363np / m is calculated. Figure 4 The pre-calibrated fitting curve shown in the figure shows that the viscosity of the fluid to be tested is about 257.7 cp.

[0088] For the flow rate measurement of the fluid to be measured:

[0089] according to Figure 3 All the black signals in the figure, that is, the waveguide signal excited by the signal transceiver unit Ⅰ2 and the waveguide signal received by the transceiver unit Ⅱ3, are used to calculate the corresponding first signal delay t1 based on the correlation function algorithm.

[0090] The switching module 13 adjusts the order of sending and receiving, so that the signal transceiver unit II3 and the signal transceiver unit I2 exchange sending and receiving, that is, the signal transceiver unit II3 is used as the transmitting end and the signal transceiver unit I2 is used as the receiving end to obtain the following Figure 3 Red received signal graph, according to Figure 3 All the red signals in the figure, that is, the waveguide signal excited by the signal transceiver unit II3 and the waveguide signal received by the transceiver unit I2, are used to calculate the corresponding second signal delay t2 based on the correlation function algorithm.

[0091] The calculated first signal delay t1 and second signal delay t2 are 8.0310 μs and 7.8856 μs respectively. Figure 5 The pre-calibrated fitting curve v g (v) = v g0 +0.26v, the velocity fitting coefficient ε is obtained to be 0.26, and then the first signal delay t1, the second signal delay t2, the velocity fitting coefficient ε and the interval d between the signal transceiver unit Ⅰ2 and the signal transceiver unit Ⅱ3 are substituted into the following formula to obtain the corresponding measured fluid velocity v of 13.2m / s:

[0092]

[0093] This embodiment utilizes the switching module 13 to exchange transmission and reception to calculate the signal delay, and utilizes the attenuation rate y of the waveguide signal and the waveguide group velocity to establish the relationship between the attenuation rate t of the waveguide signal and the viscosity x of the fluid to be measured, and the relationship between the waveguide group velocity and the flow rate v of the fluid to be measured. During the detection process, the steel pipe is used as a carrier, and there is no need to open holes or change the design of the original steel pipe structure, and there is no need to perform sampling detection. Moreover, the viscosity x of the fluid to be measured, the flow rate v of the fluid to be measured and their changes can be displayed and updated in real time on the display module 14 of the host computer.

[0094] The present invention solves the problems of cumbersome multi-interval sampling detection methods and poor real-time performance, and overcomes the disadvantage that the immersion detection unit needs to open holes or change the design of the original container or pipeline structure. At the same time, it has the ability to detect flow rate and can achieve the purpose of online detection of fluid viscosity and flow rate in non-destructive installation.

[0095] The above specific implementation modes are used to explain the present invention rather than to limit the present invention. Any modification and change made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. A non-destructively installed fluid viscosity and flow velocity online detection device, characterized in that: It comprises a container (1) and two signal transceiver units; The container (1) is a pipe filled with the fluid to be measured or a tank for storing the fluid to be measured, and the two signal transceiver units are arranged on the outer wall surface of the container (1) at intervals along the axial direction; The two signal transceiver units are respectively a signal transceiver unit I (2) and a signal transceiver unit II (3), both of which are used to excite or receive waveguide signals.

2. The non-destructively installed fluid viscosity and flow velocity online detection device according to claim 1, characterized in that: Each signal transceiver unit includes a coil assembly and a magnetostrictive transducer material (5); The magnetostrictive transducer material (5) is arranged along the circumferential direction of the outer wall of the container (1); the coil group comprises two coils (4); the two coils (4) are arranged at intervals along the axial direction of the container (1); each coil (4) is arranged on the magnetostrictive transducer material (5) along the circumferential direction of the outer wall of the container (1); and the magnetostrictive transducer material (5) is kept in contact with the two coils (4); The magnetostrictive transducer materials (5) of the two signal transceiver units are arranged along a straight line parallel to the axial direction of the container (1).

3. The non-destructively installed fluid viscosity and flow velocity online detection device according to claim 1, characterized in that: It also includes a control module (6), a waveguide excitation module (7), a pulse generation module (8), a power amplification module (9), an echo receiving module (10), a preamplifier (11), a data acquisition module (12), a switching module (13) and a display module (14); The switching module (13) is electrically connected to the signal transceiver unit I (2) and the signal transceiver unit II (3) respectively; the switching module (13) is electrically connected to the control module (6) via the echo receiving module (10), the preamplifier (11), and the data acquisition module (12); the control module (6) is electrically connected to the switching module (13) via the waveguide excitation module (7), the pulse generating module (8), and the power amplification module (9); and the control module (6) is electrically connected to the display module (14).

4. The non-destructively installed fluid viscosity and flow velocity online detection device according to claim 1, characterized in that: The material of the magnetostrictive transducer material (5) includes, but is not limited to, magnetic conductive materials such as nickel, iron, iron-nickel alloy, iron-aluminum alloy and iron-cobalt alloy.

5. A non-destructively installed fluid viscosity and flow rate online detection method applied to the device of any one of claims 1 to 4, characterized in that: The steps are as follows: 1) selecting a waveguide mode dominated by in-plane displacement as an excitation mode, calculating a waveguide dispersion curve of the container (1) according to structural geometric parameters and material mechanical characteristics of the container (1), and selecting an excitation frequency according to the waveguide dispersion curve; 2) When there is no fluid to be measured in the container (1), the signal transceiver unit I (2) is controlled to be a transmitting end and the signal transceiver unit II (3) is controlled to be a receiving end. The signal transceiver unit I (2) sends a waveguide signal which propagates along the outer wall of the container (1) and is received by the signal transceiver unit II (3). The waveguide signal received by the signal transceiver unit II (3) is used as a reference signal w0; 3) Filling the container (1) with a fluid to be tested having a viscosity of η, in the same manner as step 2), the waveguide signal received by the signal transceiver unit II (3) is used as the first filling detection signal w, and the corresponding attenuation rate y is obtained in combination with the reference signal w0 in step 2), and the viscosity x of the fluid to be tested is obtained according to the attenuation rate y combined with a pre-calibrated fitting curve, thereby realizing online detection of the fluid viscosity; 4) calculating the first signal delay t1 according to the waveguide signal excited by the signal transceiver unit I (2) and the waveguide signal received by the signal transceiver unit II (3) in step 3); 5) The switching module (13) adjusts the signal transceiver unit circuit so that the signal transceiver unit II (3) and the signal transceiver unit I (2) exchange transmission and reception, that is, the signal transceiver unit II (3) is used as the transmitting end and the signal transceiver unit I (2) is used as the receiving end. In the same manner as step 2), the waveguide signal received by the signal transceiver unit I (2) is used as the second liquid filling detection signal w ′ ; 6) calculating the second signal delay t2 according to the waveguide signal excited by the signal transceiver unit II (3) and the waveguide signal received by the signal transceiver unit I (2) in step 5); 7) According to the first and second signal delays t1 and t2 obtained in steps 4) and 6), the velocity fitting coefficient ε is obtained in combination with the pre-calibrated fitting curve, and the flow velocity v of the fluid to be measured is calculated according to the flow velocity fitting coefficient ε to realize online detection of the fluid flow velocity.

6. A non-destructive installation fluid viscosity and flow velocity online detection method according to claim 5, characterized in that: In step 3), the attenuation rate y is calculated according to the following formula: Wherein, d is the spacing distance between the signal transceiver unit I (2) and the signal transceiver unit II (3), w0 represents the reference signal when there is no fluid to be tested in step 2), w represents the first filling detection signal, U(*) represents the amplitude, and y represents the attenuation rate.

7. A non-destructive online detection method for fluid viscosity and flow velocity according to claim 5, characterized in that: In step 3), the formula of the pre-calibrated fitting curve of the viscosity x of the fluid to be measured is: y=ax b +c Where y represents the attenuation rate, x represents the viscosity of the fluid to be measured, and a, b and c are all viscosity fitting coefficients.

8. The method for online detection of fluid viscosity and flow velocity by non-destructive installation according to claim 5, characterized in that: In step 4) and step 6), the calculation method of the first and second signal delays t1 and t2 includes but is not limited to the correlation function method.

9. A non-destructive installation fluid viscosity and flow velocity online detection method according to claim 5, characterized in that: In step 7), the flow rate fitting coefficient ε is obtained according to the following pre-calibrated fitting curve: v g (v)=v g0 +εv Where v represents the flow rate of the fluid to be measured, v g (v) represents the function of guided wave group velocity with respect to fluid velocity, v g0 It represents the guided wave group velocity when the fluid velocity is 0, and ε represents the velocity fitting coefficient.

10. A non-destructive installation fluid viscosity and flow velocity online detection method according to claim 5, characterized in that: In step 7), the flow rate v of the fluid to be measured is obtained by processing according to the following formula: Wherein v represents the flow velocity of the fluid to be measured, d represents the spacing distance between the signal transceiver unit I (2) and the signal transceiver unit II (3), t1 represents the signal delay when the signal transceiver unit I (2) is used as the excitation unit, t2 represents the signal delay when the signal transceiver unit II (3) is used as the excitation unit, and ε represents the flow velocity fitting coefficient.

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