Device and method for detecting viscosity of isopropanol solution

Abstract

The invention relates to a device and a method for detecting the viscosity of an isopropanol solution, belongs to the field of information technology detection, solves the problem that the viscosity of the solution cannot be detected in real time when medium-temperature wax is dissolved by isopropanol, can detect the viscosity eta of the solution in real time, and has the characteristics of timely feedback, simple operation, accurate detection and the like. The core parts of the device are a rotor stirring mechanism and a motor, when the motor starts to rotate at a low speed, the motor and the rotor stirring mechanism rotate together under the action of magnetic force and generate a lag phase angle # imgabs 0 #, a Hall sensor is controlled by an embedded technology to measure a magnetic field signal, a phase angle # imgabs 1 # is solved, and meanwhile, a proper solution is taken out; detecting the current viscosity value eta by using a rotational viscometer, and establishing a relation model between the phase angle # imgabs2 and the viscosity eta, wherein the phase angle # imgabs2 corresponds to the rotating speed and the temperature; measuring the phase angle # imgabs3 # of the solution next time, and obtaining the viscosity value eta 1 of the solution according to the phase angle-viscosity relation model.

Description

Technical Field

[0001] The invention relates to the field of information technology detection, and in particular to a device and method for detecting the viscosity of an isopropyl alcohol solution. Background Art

[0002] At present, in many industrial applications and scientific research, traditional viscosity measurement methods include rotational viscosity method, timed flow method, friction method, etc. The above methods cannot reflect the real-time viscosity of the flowing liquid.

[0003] After searching, the invention patent with patent number "CN202310432207.5" mentioned in the text that the detection method is carried out offline, and samples need to be taken from the production line or experiment and placed in the instrument for measurement, which will cause delays in the measurement results. It is not suitable for application scenarios that require real-time monitoring of viscosity, there are errors, and more complex equipment is required. For high-viscosity solutions, the rotor may not rotate normally. The present invention proposes a delayed phase angle measurement method, which avoids the delay of measurement results and achieves the effect of real-time detection and reducing experimental errors. Summary of the invention

[0004] In view of the above analysis, the object of the present invention is to provide an isopropanol solution viscosity detection device and method, which can detect the viscosity of the isopropanol solution in real time while the solution is heated and stirred, and does not affect the dissolution of the medium-temperature wax by the isopropanol solution.

[0005] The purpose of the present invention is mainly achieved through the following technical scheme: a motor 7 is connected to the bottom of a base 6, an OLED display screen 5 is connected to the front of the base 6, a heating plate 8 is connected to the top of the base 6, a container 1 is placed on the heating plate 8, the bottom structure of the container 1 is designed as a boss structure, a deep groove ball bearing 2 is installed on the outer side of the boss, a rotor stirring mechanism 3 is installed on the outer side of the deep groove ball bearing 2, the rotor stirring mechanism 3 includes 4 square magnets 301, a rotor 302 and 2 circular magnets 303, water inlets 11 and water outlets 4 are arranged on both sides of the container 1, a filter screen 10 is installed in the middle of the container 1, a container cover 12 is installed on the top, a Hall sensor mechanism 9 is connected to the outer side of the container 1, the Hall sensor mechanism 9 includes a motor Hall sensor 901 and a rotor Hall sensor 902, and a control module is arranged inside the base 6, which controls the OLED display screen 5, the motor 7, the heating plate 8 and the thermocouple temperature measurement.

[0006] Furthermore, the base 6 is connected to each component by bolts, and a threaded through hole is provided in the connecting portion of the base 6.

[0007] Furthermore, in the rotor stirring mechanism 3, the rotor 302 is connected to the boss of the container 1 through a deep groove ball bearing 2, four square magnets 301 are arranged on the inner side of the rotor 302, and two circular magnets 303 are arranged on the outer side, and the center points of the rotor stirring mechanism 3 and the motor 7 are in a coaxial relationship in the vertical direction.

[0008] Furthermore, in the Hall sensor mechanism 9, the rotor Hall sensor 902 is horizontally arranged relative to the rotor stirring mechanism 3 and fits tightly against the outer wall of the container 1, and the motor Hall sensor 901 is aligned vertically relative to the rotor Hall sensor 902, and the motor Hall sensor 901 is bolted to the base 6.

[0009] Furthermore, a control module is arranged inside the base 6 , which controls the display of the OLED display screen 5 , the speed regulation of the motor 7 , the temperature of the heating plate 8 and the thermocouple temperature measuring device.

[0010] A method for detecting the viscosity of an isopropanol solution comprises the following steps:

[0011] S1: Add isopropyl alcohol solution into container 1, covering filter 10; put medium temperature wax on filter 10, adjust the speed of motor 7 to drive rotor stirring mechanism 3 to rotate, and start to energize heating plate 8;

[0012] S2: Under certain temperature conditions, change the motor speed v A , record the phase angle on OLED display 5 and the current viscosity value η detected by the viscometer A , under the condition of constant motor speed, change the solution temperature and record the phase angle on the OLED display 5 and the current viscosity η B , keep changing the above conditions and record the phase angle and viscosity η;

[0013] S3: Viscosity η and phase angle detected by S2 Data, establish the viscosity-phase angle relationship model, and then only need to detect the current phase angle The current phase angle can be calculated through the viscosity-phase angle relationship model The corresponding solution viscosity value η 1 .

[0014] In step S2, the phase angle The reason for this is that as the isopropanol solution dissolves the medium-temperature wax, the viscosity of the solution increases, the resistance of the rotor stirring mechanism 3 to the rotation in the container 1 increases, and the time t when the rotor Hall sensor 902 detects the Hall signal 2 The time t that the motor Hall sensor 901 detects the Hall signal 1 After a delay, the phase angle is obtained.

[0015]

[0016] Among them, t 2 is the moment when the rotor Hall sensor 902 detects the signal of the cylindrical magnet 303; where t 1 is the moment when the motor Hall sensor 901 detects the magnet signal of the motor 7; wherein T 1 It is the period of one rotation of the motor 7.

[0017] In step S2, by continuously changing the speed of the motor 7 and the temperature of the solution, the viscosity η and the phase angle of the solution at different temperatures and different speeds are measured.

[0018] In step S3, the viscosity η and phase angle According to the data analysis, the phase angle is calculated. The relationship between viscosity and phase angle is established.

[0019] In step S3, after the model is established, the phase angle is measured by the Hall sensor mechanism 9 Find the corresponding viscosity value η according to the model.

[0020] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0021] The present invention can measure the viscosity η of the solution in real time, and has the characteristics of timely feedback, simple operation, and accurate measurement. The core part of the device is the rotor stirring mechanism and the motor. When the motor starts to rotate at a low speed, the motor and the rotor stirring mechanism rotate together under the action of magnetic force and produce a lagging phase angle. Using embedded technology to control the Hall sensor to measure the magnetic field signal and calculate the phase angle At the same time, take out appropriate solution, use rotational viscometer to measure the current viscosity value η, and establish the relationship model between phase angle and viscosity corresponding to rotation speed and temperature; the next time the solution is passed through the measured phase angle And according to the phase angle-viscosity relationship model, the viscosity value η of the solution is obtained 1 . BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description 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 any creative work.

[0023] Figure 1 It is the overall structure diagram of the present invention;

[0024] Figure 2 It is the overall right view of the present invention;

[0025] Figure 3 It is an overall cross-sectional view of the present invention;

[0026] Figure 4 The rotor stirring mechanism structure diagram of the present invention

[0027] Figure 5 This is a structural diagram of the container of the present invention;

[0028] Figure 6 This is a schematic diagram of the motor and rotor cycle of the present invention;

[0029] Figure 7 A schematic diagram of the lag phase angle between the motor and the rotor of the present invention;

[0030] Figure 8 This is a flow chart of an isopropanol solution viscosity detection device and method of the present invention;

[0031] Figure 1-8 Winning bid number: 1. Container; 2. Deep groove ball bearing; 3. Rotor stirring mechanism; 301. Square magnet; 302. Rotor; 303. Round magnet; 4. Water outlet; 5. OLED display; 6. Base; 7. Motor; 8. Heating plate; 9. Hall sensor mechanism; 901. Motor Hall sensor; 902. Rotor Hall sensor; 10. Filter; 11. Water inlet; 12. Container cover. DETAILED DESCRIPTION

[0032] 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.

[0033] like Figure 1-8As shown, in Example 1, an isopropanol solution viscosity detection device comprises a base 6, a motor 7 is connected to the bottom of the base 6, an OLED display screen 5 is arranged on the front of the base 6, a heating plate 8 is connected to the top of the base 6, a container 1 is placed on the heating plate 8, a water inlet 4 and a water outlet 11 are arranged on both sides of the container 1, the water inlet 4 and the water outlet 11 are used to introduce and export the solution through a water pipe to achieve the effect of replacing the solution, a filter screen 10 is arranged in the middle of the container 1, a container cover 12 is arranged on the top of the container 1 to prevent the isopropanol from gasifying and evaporating, and the bottom structure of the container 1 is designed as a boss structure, a deep groove ball bearing 2 is connected to the boss part, and the deep groove ball bearing 2 is connected The rotor stirring mechanism 3 includes four square magnets 301, a rotor 302 and two circular magnets 303. The four square magnets 301 are distributed in a circle on the outside of the deep groove ball bearing 2 to evenly bear the force and drive the rotor 302 to rotate. The outside of the container 1 is connected to a Hall sensor mechanism 9. The Hall sensor mechanism 9 includes a motor Hall sensor 901 and a rotor Hall sensor 902 to detect Hall signals and measure phase angles. A control module is provided inside the base to control the OLED display 5, the motor 7, the heating plate 8 and the thermocouple temperature measurement. The control module is used to control the overall device.

[0034] In this embodiment, the base 6 is connected to each component by bolts, and a threaded through hole is provided at the connecting portion of the base 6 to ensure a stable connection between each component and the base 6.

[0035] In this embodiment, the rotor stirring mechanism 3 includes a square magnet 301, a rotor 302 and a circular magnet 303. The rotor 302 is connected to the boss of the container 1 through a deep groove ball bearing 2 to ensure that the rotor stirring mechanism 3 can rotate. Four square magnets 301 are arranged on the inner side of the rotor 302, and two circular magnets 303 are arranged on the outer side. The center points of the rotor stirring mechanism 3 and the motor 7 are coaxial in the vertical direction to ensure that the rotor stirring mechanism 3 is subjected to uniform force and stable rotation speed during rotation.

[0036] In this embodiment, the Hall sensor mechanism 9 includes a motor Hall sensor 901 and a rotor Hall sensor 902. The rotor Hall sensor 902 is horizontally arranged with respect to the rotor stirring mechanism 3 and is closely attached to the outer wall of the container 1. The motor Hall sensor 901 is aligned with the rotor Hall sensor 902 up and down. The motor Hall sensor 901 is bolted to the base 6. This part ensures that the phase angle measured by the Hall sensor mechanism 9 accuracy.

[0037] In this embodiment, the control module is arranged inside the base 6, which controls the display of the OLED display screen 5, the speed regulation of the motor 7, the temperature of the heating plate 8 and the thermocouple temperature measuring device, which ensures the operation control function of each component in the device.

[0038] Embodiment 2, a method for detecting the viscosity of an isopropanol solution, comprising the following steps:

[0039] S1: Place the medium-temperature wax on the filter 10. At this time, the medium-temperature wax is in a large solid state. Add the isopropyl alcohol solution at room temperature into the container 1 through the water inlet 11, cover the filter 10, and let it stand. Adjust the motor 7 to drive the rotor 302 to rotate, start to energize the heating plate 8, and the medium-temperature wax slowly dissolves.

[0040] S2: When the temperature, initial viscosity of the solution and other conditions are constant, the motor speed v A Set different parameters from small to large, in the phase angle After reaching a stable state, record the viscosity value η of the solution every 1 minute. A and phase angle When the motor speed v A When the initial viscosity of the solution and other conditions are constant, the solution temperature is set to different parameters from small to large, and the phase angle After reaching a stable state, record the viscosity value η of the solution every 1 minute. B and phase angle

[0041] S3: Analyze the viscosity and phase angle data under different speed and temperature conditions recorded by S2, and establish a viscosity-phase angle relationship model. Subsequent detection only requires detecting the current phase angle. The current phase angle can be calculated through the viscosity-phase angle relationship model The corresponding solution viscosity value η 1 .

[0042] Furthermore, in step S1, relevant data were consulted and it was found that the use of 75% isopropanol solution to dissolve the medium-temperature wax solid showed better dissolution performance.

[0043] Furthermore, in step S1, the container is 3.5L, and the added isopropanol solution must not be higher than 3L, because the vortex formed during the stirring process will increase the height of the solution and prevent the solution from overflowing; the temperature of the heated solution must not exceed 70°C, and isopropanol is a volatile toxic organic solvent, which begins to evaporate when the solution temperature reaches 70°C.

[0044] Furthermore, in step S1, considering the accuracy of the solution temperature, the classic PID control algorithm is used for temperature control. The formula of the PID control algorithm is as follows:

[0045]

[0046] Where: u(t) is the output of the controller, Kp is the proportional gain, which is used to adjust the strength of the proportional control, Ki is the integral gain, which is used to adjust the strength of the controller's effect on the integral error, Kd is the differential gain, which is used to adjust the strength of the controller's effect on the differential error, e(t) is the current error signal, usually the set value minus the actual value, ∫e(t)dt is the integral of the error signal, which represents the accumulated amount of error, and de(t) / dt is the differential of the error signal, which represents the rate of change of the error.

[0047] The PID control algorithm achieves precise control of the system through the comprehensive effects of proportional control, integral control and differential control. The parameters Kp=1500, Ki=0.1, Kd=0 are set; selection and adjustment are made according to the transfer function and control strategy of the temperature system to achieve stable temperature control.

[0048] Furthermore, step S1 is the initial preparation of the method, which ensures the temperature, concentration, shape of the medium-temperature wax and rotor speed of the isopropanol solution, so as to provide accurate test conditions for subsequent experiments.

[0049] Further, in step S2, if Figure 6 and 7 As shown, the reason for the signal sequence is that the rotor 302 is subject to resistance in the solution and there is a magnetic field between itself and the motor 7. Considering the above reasons, the program is designed so that when the motor Hall sensor 901 detects the motor magnetic field signal, the timer records the rising edge signal time t at this time. 1 Then, when the rotor Hall sensor 902 detects the rotor magnetic field signal, the timer records the rising edge signal time t at this time. 2 , the difference between the two is Figure 6 Mark the time difference; due to different speeds, the time difference will also change, and the corresponding relationship between viscosity and time difference is uncertain, while the angle has a relatively linear relationship with viscosity. Therefore, the phase angle is calculated by measuring the motor cycle and time difference.

[0050]

[0051] where t 2 It is the moment when the rotor Hall sensor 902 detects the signal of the circular magnet 303;

[0052] where t 1 It is the moment when the motor Hall sensor 901 detects the magnet signal of the motor 7;

[0053] Where T 1 is the rotation period of the motor 7.

[0054] Furthermore, in step S2, the solution temperature and the speed of the motor 7 are set to remain unchanged, and the current phase angle is recorded every 1 minute. Use a rotational viscometer to measure the current viscosity value η A .

[0055] Furthermore, in step S2, the solution temperature is set unchanged, the speed of the motor 7 is adjusted, and the current phase angle is recorded every 1 minute. Use a rotational viscometer to measure the current viscosity value η B .

[0056] Furthermore, in step S2, the speed of the motor 7 is set to remain unchanged, and after adjusting the temperature of the solution, the current phase angle is recorded every 1 minute. Use a rotational viscometer to measure the current viscosity value η C .

[0057] Furthermore, in step S2, the phase angle under all conditions is detected by continuously changing the temperature and speed conditions. Relationship with viscosity η.

[0058] Further, in step S3, the measured viscosity η and phase angle The data were mathematically analyzed, and the average value was taken to obtain the corresponding relationship between phase angle and viscosity, and a viscosity-phase angle relationship model was established.

[0059] Furthermore, in step S3, the Hall sensor designed in the device of the present invention detects the hysteresis phase angle function. When the viscosity of the solution needs to be detected again, there is no need to use a rotational viscometer to take samples from another location. The device of the present invention will detect the current phase angle of the solution. The viscosity value η of the solution at the corresponding temperature and the speed of the motor 7 can be calculated by the viscosity-phase angle relationship model. 1 .

Claims

1. An isopropanol solution viscosity detection device, Features: The invention comprises a base (6) having a motor (7) connected to the bottom, an OLED display screen (5) connected to the front of the base (6), a heating plate (8) connected to the top of the base (6), a container (1) placed on the heating plate (8), the bottom structure of the container (1) being designed as a boss structure, a deep groove ball bearing (2) being installed on the outer side of the boss, the deep groove ball bearing (2) being connected to a rotor stirring mechanism (3), the rotor stirring mechanism (3) comprising four square magnets (301), a rotor (302) and two circular magnets (303), a water inlet (11) and a water outlet (4) being arranged on both sides of the container (1), a filter screen (10) being installed in the middle of the container (1), and a container cover (12) being installed on the top, a Hall sensor mechanism (9) being connected to the outer side of the container (1), the Hall sensor mechanism (9) comprising a motor Hall sensor (901) and a rotor Hall sensor (902), and a control module being arranged inside the base (6) for controlling the OLED display screen (5), the motor (7), the heating plate (8) and the thermocouple.

2. The isopropanol solution viscosity detection device according to claim 1, Features: The base (6) is connected to each component by bolts, and a threaded through hole is provided in a connecting portion of the base (6).

3. The isopropanol solution viscosity detection device according to claim 2, Features: In the rotor stirring mechanism (3), the rotor (302) is connected to the boss of the container (1) via a deep groove ball bearing (2), four square magnets (301) are arranged on the inner side of the rotor (302), and two circular magnets (303) are arranged on the outer side, and the center points of the rotor stirring mechanism (3) and the motor (7) are in a coaxial relationship in the vertical direction.

4. The isopropanol solution viscosity detection device according to claim 3, Features: In the Hall sensor mechanism (9), the rotor Hall sensor (902) is horizontally arranged relative to the rotor stirring mechanism (3) and is closely fitted to the outer wall of the container (1); the motor Hall sensor (901) is aligned vertically relative to the rotor Hall sensor (902); and the motor Hall sensor (901) is bolted to the base (6).

5. The isopropanol solution viscosity detection device according to claim 4, Features: The control module is arranged inside the base (6), and controls the display of the OLED display screen (5), the speed regulation of the motor (7), the temperature of the heating plate (8) and the thermocouple temperature measuring device.

6. A method for detecting the viscosity of an isopropanol solution as claimed in any one of claims 1 to 5, It is characterized in that The following steps are involved: S1: Add isopropyl alcohol solution into the container (1) until it covers the filter (10); place the medium-temperature wax on the filter (10), adjust the speed of the motor (7) to drive the rotor stirring mechanism (3) to rotate, and start to energize the heating plate (8); S2: Under the condition of constant temperature, change the speed v of the motor (7) A , record the phase angle on the OLED display (5) and the current viscosity value η detected by the viscometer A Under the condition that the speed of the motor (7) is constant, the temperature of the solution is changed and the phase angle on the OLED display (5) is recorded. and the current viscosity value η B , keep changing the above conditions and record the phase angle and viscosity η; S3: Viscosity η and phase angle detected by S2 Data, establish the viscosity-phase angle relationship model, and then only need to detect the current phase angle The current phase angle can be calculated through the viscosity-phase angle relationship model The corresponding solution viscosity value η 1 .

7. A method for detecting viscosity of an isopropanol solution according to claim 6, Features: In step S2, the phase angle The reason for this is that as the isopropanol solution dissolves the medium temperature wax, the viscosity of the solution increases, the resistance of the rotor stirring mechanism (3) to rotation in the container (1) increases, and the time t when the rotor Hall sensor (902) detects the Hall signal 2 The time t when the motor Hall sensor (901) detects the Hall signal 1 After a delay, the phase angle is obtained. Among them, t 2 is the moment when the rotor Hall sensor (13) detects the signal of the cylindrical magnet (303); wherein t 1 is the moment when the motor Hall sensor (901) detects the magnet signal of the motor (7); wherein T 1 is the period of one rotation of the motor (7).

8. A method for detecting viscosity of an isopropanol solution according to claim 7, Features: In step S2, by continuously changing the speed of the motor (7) and the temperature of the solution, the viscosity η and the phase angle of the solution at different temperatures and different speeds are measured.

9. A method for detecting viscosity of an isopropanol solution according to claim 8, Features: In step S3, the viscosity η and phase angle According to the data analysis, the phase angle is calculated. The relationship between viscosity and phase angle is established.

10. A method for detecting viscosity of an isopropanol solution according to claim 9, Features: In step S3, after the model is established, the phase angle is measured by the Hall sensor mechanism (9). Find the corresponding viscosity value η according to the model 1 .

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