A temperature-controllable salt solution resistivity testing device and method

Abstract

The invention provides a temperature-controllable salt solution resistivity testing device and method, which comprises a constant temperature pool, a heating plate is installed at the bottom of the constant temperature pool, a first temperature sensor is installed in the constant temperature pool, and a quick-connect plug on the heating plate and the first temperature sensor are connected to a temperature controller; three first test pools, a second test pool and a third test pool with different lengths are installed in the constant temperature pool, and each test pool is respectively provided with a second temperature sensor, a liquid injection pipe and an exhaust pipe; electrodes are respectively installed at both ends of the first test pool, the second test pool and the third test pool, and the electrodes are installed on the outer covers of the test pools; the device is suitable for measuring the resistivity of salt solutions at different temperatures, realizes the integration of precise temperature regulation and measurement of the salt solution, is convenient to operate and maintain, and can improve the accuracy of the measurement result.

Description

Technical Field

[0001] The invention relates to the technical field of electrical measurement test devices, and in particular to a temperature-controllable salt solution resistivity test device and method. Background Art

[0002] The resistivity of salt solution is an important parameter to measure its conductive properties. This value is related to the accuracy of theoretical calculations and numerical simulation results of current conduction, electric field distribution and current density distribution in relevant electromagnetic models. It is an indispensable physical parameter for electromagnetic analysis involving salt solution. In actual work, the temperature of the salt solution will gradually rise due to the influence of current, and temperature is an important factor affecting the resistivity of the salt solution. Clarifying the resistivity values ​​of the salt solution at different temperatures is related to the accuracy of theoretical analysis and numerical simulation. Existing test equipment neglects precise temperature control and is mostly based on one test pool size, so the test results inevitably have certain errors. Therefore, designing a salt solution resistivity test device with precise temperature control and multi-size test pools is of great significance for accurately measuring the resistivity of salt solutions at various temperatures. Summary of the invention

[0003] In order to overcome the shortcomings of existing test equipment, the present invention provides a temperature-controllable salt solution resistivity testing device and method. The device is suitable for measuring the resistivity of salt solutions at different temperatures, realizing the integration of precise temperature regulation and measurement of salt solutions, and is easy to operate and maintain, thereby improving the accuracy of measurement results.

[0004] In order to realize the above technical features, the object of the present invention is achieved as follows: a temperature-controllable salt solution resistivity test device, which includes a constant temperature pool, a heating plate is installed at the bottom of the constant temperature pool, a first temperature sensor is installed in the constant temperature pool, and the quick-connect plug on the heating plate and the first temperature sensor are connected to a temperature controller;

[0005] The constant temperature pool is equipped with a first test pool, a second test pool and a third test pool of different lengths, each test pool is provided with a second temperature sensor, a liquid injection pipe and an exhaust pipe;

[0006] Electrodes are installed at both ends of the first test pool, the second test pool and the third test pool, respectively, and the electrodes are installed on the outer covers of the test pools;

[0007] The second temperature sensors on the first test pool, the second test pool and the third test pool are respectively connected to the first temperature measurement module, the second temperature measurement module and the third temperature measurement module in sequence;

[0008] The electrode is connected with a terminal, and the terminal is connected with a test module.

[0009] The test module is composed of a direct current power supply, an adjustable resistor, an ammeter, a voltmeter and a switch.

[0010] The constant temperature pool is made of high temperature resistant insulating materials on all sides; the surface of the heating plate in contact with the solution is made of corrosion-resistant material; the first temperature sensor is installed on the inner wall of the constant temperature pool, and the temperature measuring position of the first temperature sensor is the middle position of the constant temperature pool along the height direction; the top of the constant temperature pool is provided with a liquid injection hole and an exhaust hole.

[0011] The first test pool, the second test pool and the third test pool are all cylindrical and made of transparent, high temperature resistant, insulating and corrosion resistant materials.

[0012] The outer cover of the test cell is installed at both ends of the corresponding first test cell, second test cell and third test cell by adopting a threaded detachable structure, and a corrosion-resistant waterproof gasket is provided at the contact position between the cylindrical end of the test cell and the outer cover of the test cell; an electrode is installed on the inner wall of the outer cover of the test cell. The electrode is circular in shape, made of graphite, and can be detached and replaced.

[0013] The temperature controller is composed of a control module, a temperature measuring module and a power supply module. The temperature is set by the control module. If the temperature measured by the temperature measuring module is lower than the set temperature, the power supply module is started, otherwise the power supply module is shut down.

[0014] The voltage of the DC power supply is adjustable, and the adjustable resistor, ammeter, and voltmeter are all high-precision electronic components. The voltage adjustment knob, resistance adjustment knob, and switch are all arranged on the outer surface of the test module, and each electrical signal value can be read through the display on the test module.

[0015] The method for performing resistivity testing using the temperature-controllable salt solution resistivity testing device comprises the following steps:

[0016] Step 1: first open the injection pipes and exhaust pipes on the first test pool, the second test pool and the third test pool, inject the salt solution to be tested into the first test pool, the second test pool and the third test pool using a syringe, and exhaust the air through the exhaust pipe to fill the test pool with the salt solution;

[0017] Step 2: Select the type of constant temperature liquid according to the preset temperature of the salt solution to be tested, then open the injection hole and exhaust hole on the constant temperature pool, and inject the constant temperature liquid into the constant temperature pool from the injection hole. Finally, the liquid level must be above the test pool.

[0018] Step 3, connecting the first temperature sensor and the quick-connect plug on the heating plate to the temperature controller, setting the temperature on the temperature controller to a preset temperature, and observing the temperatures of the salt solutions in the first test pool, the second test pool, and the third test pool through the first temperature measuring module, the second temperature measuring module, and the third temperature measuring module;

[0019] Step 4, when the temperature reaches the set temperature, connect the test module to the terminals on the first test pool, the second test pool and the third test pool in turn, turn on the switch on the test module, adjust the power supply and the variable resistor to appropriate values, and then read the corresponding voltage value, current value and variable resistor value;

[0020] Then, the resistivity values ​​ρ corresponding to the first test pool, the second test pool, and the third test pool are calculated in turn according to the following formulas (1) and (2): 1 , 2 , 3 ;

[0021]

[0022]

[0023] Where U i is the voltage meter reading, I i is the ammeter reading, R 变i is the variable resistance reading, R 线i is the line resistance value, S i is the cross-sectional area of ​​the salt solution in the test tank, L i is the length of the salt solution in the test pool; subscript 1 corresponds to the first test pool, subscript 2 corresponds to the second test pool, and subscript 3 corresponds to the third test pool; the final value of the salt solution resistivity ρ is calculated according to the above formula (2);

[0024] Step 5. After the test is completed, unscrew the outer cover of the test cell and clean the first test cell, the second test cell, the third test cell and the electrodes.

[0025] The present invention has the following beneficial effects:

[0026] When using this device, first set the temperature of the temperature controller to the preset temperature, monitor the temperature of the liquid to be tested through the temperature sensor on the test pool, and when the temperature of the liquid to be tested in the three sizes of test pools reaches the preset temperature, connect the test module to each test pool in turn, adjust the voltage and resistance of the test module, and obtain the corresponding voltage value, current value and adjustable resistance value of each test pool; then calculate the resistivity of the salt solution corresponding to each test pool according to the resistivity calculation formula, and finally take the resistivity of the salt solution to be tested at the preset temperature as the average of the resistivity measured by the three sizes of test pools. During the test, the temperature of the salt solution can be accurately controlled and maintained constant, which can greatly reduce the impact of temperature deviation on the test results; compared with the single-size test pool, the test result takes the average of the test results of the multi-size test pools, which can reduce the error caused by the size effect to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] Figure 1 It is a schematic diagram of the structure of the device of the present invention.

[0029] Figure 2 It is a plan cross-sectional view of the device of the present invention.

[0030] Figure 3 yes Figure 2 1-1 cross-sectional view in FIG.

[0031] Figure 4 yes Figure 2 Sectional view of section 2-2 in FIG.

[0032] In the figure: a constant temperature pool 1, a first test pool 2, a second test pool 3, a third test pool 4, a terminal 5, a first temperature sensor 6, a second temperature sensor 7, a test pool injection pipe 8, a test pool exhaust pipe 9, a temperature controller 10, a temperature measuring module 11, a temperature measuring module 12, a temperature measuring module 13, a test module 14, a quick-connect plug 15, a constant temperature pool injection hole 16, a constant temperature pool exhaust hole, a waterproof rubber pad 18, a constant temperature liquid 19, a liquid to be tested 20, an electrode 21, a test pool outer cover 22, a heating plate 23, a DC power supply 24, an adjustable resistor 25, an ammeter 26, a voltmeter 27, and a switch 28. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0034] Embodiment 1:

[0035] See also Figure 1-4 A temperature-controllable salt solution resistivity testing device comprises a constant temperature pool 1, a heating plate 23 is installed at the bottom of the constant temperature pool 1, a first temperature sensor 6 is installed in the constant temperature pool 1, and a quick-connect plug 15 on the heating plate 23 and the first temperature sensor 6 are connected to a temperature controller 10; three first test pools 2, a second test pool 3 and a third test pool 4 of different lengths are installed in the constant temperature pool 1, and each test pool is respectively provided with a second temperature sensor 7, a liquid injection pipe 8 and an exhaust pipe 9; electrodes 21 are respectively installed at both ends of the first test pool 2, the second test pool 3 and the third test pool 4, and the electrodes 21 are installed on the test pool outer cover 22; the second temperature sensors 7 on the first test pool 2, the second test pool 3 and the third test pool 4 are respectively connected to the first temperature measuring module 11, the second temperature measuring module 12 and the third temperature measuring module 13 in sequence; the electrode 21 is connected to a terminal 5, and the terminal 5 is connected to the test module 14. By adopting the above-mentioned resistivity testing device, it can be applied to measuring the resistivity of salt solutions at different temperatures, realizing the integration of precise temperature regulation and measurement of salt solutions, and is convenient to operate and maintain, thereby improving the accuracy of measurement results.

[0036] Furthermore, the test module 14 is composed of a DC power supply 24, an adjustable resistor 25, an ammeter 26, a voltmeter 27 and a switch 28. By adopting the above test module 14, the current and voltage values ​​inside the first test pool 2, the second test pool 3 and the third test pool 4 can be measured accordingly, and then the current and voltage values ​​are used for calculating the resistance.

[0037] Furthermore, the thermostatic pool 1 is made of high temperature resistant insulating materials around; the surface of the heating plate 23 in contact with the solution is made of corrosion resistant material; the first temperature sensor 6 is installed on the inner wall of the thermostatic pool 1, and the temperature measuring part of the first temperature sensor 6 is the middle position of the thermostatic pool along the height direction; the top of the thermostatic pool 1 is provided with a liquid injection hole 16 and an exhaust hole 17. By adopting the above-mentioned thermostatic pool 1, it can be used to provide different measurement temperature environments, thereby adapting to the resistivity test of salt solutions at different temperatures. This is because according to the different salt solutions to be tested, the thermostatic liquid 19 contained in the thermostatic pool can be distilled water or other oils with different boiling points.

[0038] Furthermore, the first test pool 2, the second test pool 3 and the third test pool 4 are all cylindrical and made of transparent, high temperature resistant, insulating and corrosion resistant materials. The above test pools can be used to reliably contain the salt solution during the measurement process.

[0039] Furthermore, the test pool cover 22 is installed at both ends of the corresponding first test pool 2, second test pool 3 and third test pool 4 using a threaded detachable structure, and a corrosion-resistant waterproof gasket 18 is provided at the contact portion between the test pool cylinder end and the test pool cover 22; an electrode 21 is installed on the inner side wall of the test pool cover 22, and the electrode 21 is circular in shape, made of graphite, and can be detached and replaced. By using the above-mentioned test pool cover 22, the solution inside can be easily discharged, and the electrode 21 can achieve a good conductive effect.

[0040] Furthermore, the temperature controller 10 is composed of a control module, a temperature measuring module and a power supply module. The temperature is set by the control module. If the temperature measured by the temperature measuring module is lower than the set temperature, the power supply module is started, otherwise the power supply module is shut down. The temperature controller 10 can be used to accurately control and adjust the temperature to meet the required temperature value.

[0041] Furthermore, the voltage of the DC power supply 24 is adjustable, the adjustable resistor 25, the ammeter 26, and the voltmeter 27 are all high-precision electronic components, the voltage adjustment knob, the resistance adjustment knob, and the switch 28 are all arranged on the outer surface of the test module 14, and each electrical signal value can be read through the display on the test module 14. The above-mentioned measuring device can be used to accurately measure various data during the test process.

[0042] Embodiment 2:

[0043] The method for performing resistivity testing using the temperature-controllable salt solution resistivity testing device comprises the following steps:

[0044] Step 1: first open the injection pipes 8 and exhaust pipes 9 on the first test pool 2, the second test pool 3 and the third test pool 4, inject the salt solution 20 to be tested into the first test pool 2, the second test pool 3 and the third test pool 4 using a syringe, and exhaust the air through the exhaust pipe 9 to fill the test pools with the salt solution;

[0045] Step 2: Select the type of constant temperature liquid 19 according to the preset temperature of the salt solution 20 to be tested, then open the injection hole 16 and the exhaust hole 17 on the constant temperature pool 1, and inject the constant temperature liquid 19 into the constant temperature pool 1 from the injection hole 16, and finally the liquid level must be above the test pool;

[0046] Step 3, connecting the first temperature sensor 6 and the quick-connect plug on the heating plate 23 to the temperature controller, setting the temperature to a preset temperature on the temperature controller 10, and observing the temperature of the salt solution in the first test pool 2, the second test pool 3, and the third test pool 4 through the first temperature measuring module 11, the second temperature measuring module 12, and the third temperature measuring module 13;

[0047] Step 4, when the temperature reaches the set temperature, the test module 14 is connected to the terminals 5 on the first test pool 2, the second test pool 3 and the third test pool 4 in sequence, the switch 28 on the test module is turned on, the power supply 24 and the variable resistor 25 are adjusted to appropriate values, and then the corresponding voltage value, current value and variable resistor value are read;

[0048] Then, the resistivity values ​​ρ corresponding to the first test pool, the second test pool, and the third test pool are calculated in turn according to the following formulas (1) and (2): 1 , 2 , 3 ;

[0049]

[0050]

[0051] Where U i is the voltage meter reading, I i is the ammeter reading, R 变i is the variable resistance reading, R 线i is the line resistance value, S i is the cross-sectional area of ​​the salt solution in the test tank, L i is the length of the salt solution in the test pool; subscript 1 corresponds to the first test pool 2, subscript 2 corresponds to the second test pool 3, and subscript 3 corresponds to the third test pool 4; the final value of the salt solution resistivity ρ is calculated according to the above formula (2);

[0052] Step 5: After the test is completed, unscrew the test cell outer cover 22 and clean the first test cell 2, the second test cell 3, the third test cell 4 and the electrode 21.

Claims

1. A temperature-controlled salt solution resistivity testing device, Features: It comprises a constant temperature pool (1), a heating plate (23) is installed at the bottom of the constant temperature pool (1), a first temperature sensor (6) is installed in the constant temperature pool (1), and a quick-connect plug (15) on the heating plate (23) and the first temperature sensor (6) are connected to a temperature controller (10); The constant temperature pool (1) is provided with a first test pool (2), a second test pool (3) and a third test pool (4) of different lengths, and each test pool is provided with a second temperature sensor (7), a liquid injection pipe (8) and an exhaust pipe (9); Electrodes (21) are respectively installed at both ends of the first test pool (2), the second test pool (3) and the third test pool (4), and the electrodes (21) are installed on the outer covers (22) of the test pools; The second temperature sensors (7) on the first test pool (2), the second test pool (3) and the third test pool (4) are respectively connected to the first temperature measurement module (11), the second temperature measurement module (12) and the third temperature measurement module (13) in sequence; The electrode (21) is connected to a terminal (5), and the terminal (5) is connected to a test module (14).

2. A temperature-controlled salt solution resistivity testing device according to claim 1, Features: The test module (14) is composed of a direct current power supply (24), an adjustable resistor (25), an ammeter (26), a voltmeter (27) and a switch (28).

3. A temperature-controllable salt solution resistivity testing device according to claim 2, Features: The thermostatic pool (1) is made of high-temperature resistant insulating material on all sides; the surface of the heating plate (23) in contact with the solution is made of corrosion-resistant material; the first temperature sensor (6) is installed on the inner wall of the thermostatic pool (1), and the temperature measuring position of the first temperature sensor (6) is the middle position of the thermostatic pool along the height direction; the top of the thermostatic pool (1) is provided with a liquid injection hole (16) and an exhaust hole (17).

4. A temperature-controllable salt solution resistivity testing device according to claim 2, Features: The first test pool (2), the second test pool (3) and the third test pool (4) are all cylindrical and made of transparent, high temperature resistant, insulating and corrosion resistant materials.

5. A temperature-controllable salt solution resistivity testing device according to claim 2, Features: The test cell outer cover (22) is installed at both ends of the corresponding first test cell (2), second test cell (3) and third test cell (4) by means of a threaded detachable structure, and a corrosion-resistant waterproof gasket (18) is provided at the contact portion between the cylindrical end of the test cell and the test cell outer cover (22); an electrode (21) is installed on the inner side wall of the test cell outer cover (22); the electrode (21) is circular in shape, made of graphite, and is detachable and replaceable.

6. A temperature-controllable salt solution resistivity testing device according to claim 2, Features: The temperature controller (10) is composed of a control module, a temperature measuring module and a power supply module. The temperature is set by the control module. If the temperature measured by the temperature measuring module is lower than the set temperature, the power supply module is started; otherwise, the power supply module is shut down.

7. A temperature-controllable salt solution resistivity testing device according to claim 2, Features: The voltage of the DC power supply (24) is adjustable, the adjustable resistor (25), the ammeter (26), and the voltmeter (27) are all high-precision electronic components, the voltage adjustment knob, the resistance adjustment knob, and the switch (28) are all arranged on the outer surface of the test module (14), and each electrical signal value can be read through a display on the test module (14).

8. A method for resistivity testing using the temperature-controllable salt solution resistivity testing device according to any one of claims 3 to 7, It is characterized in that The following steps are involved: Step 1: first, open the injection pipes (8) and exhaust pipes (9) on the first test pool (2), the second test pool (3) and the third test pool (4), inject the salt solution (20) to be tested into the first test pool (2), the second test pool (3) and the third test pool (4) using a syringe, and exhaust the air through the exhaust pipe (9) so that the salt solution fills the test pools; Step 2, according to the preset temperature of the salt solution (20) to be tested, the type of the constant temperature liquid (19) is selected, and then the injection hole (16) and the exhaust hole (17) on the constant temperature pool (1) are opened, and the constant temperature liquid (19) is injected into the constant temperature pool (1) from the injection hole (16), and the liquid level finally needs to be above the test pool; Step 3, connecting the first temperature sensor (6) and the quick-connect plug on the heating plate (23) to the temperature controller, setting the temperature on the temperature controller (10) to a preset temperature, and observing the temperature of the salt solution in the first test pool (2), the second test pool (3) and the third test pool (4) through the first temperature measuring module (11), the second temperature measuring module (12) and the third temperature measuring module (13); Step 4, when the temperature reaches the set temperature, the test module (14) is connected to the terminals (5) on the first test pool (2), the second test pool (3) and the third test pool (4) in sequence, the switch (28) on the test module is turned on, the power supply (24) and the variable resistor (25) are adjusted to appropriate values, and then the corresponding voltage value, current value and variable resistor value are read; Then, the resistivity values ​​corresponding to the first test pool (2), the second test pool (3) and the third test pool (4) are calculated in turn according to the following formulas (1) and (2): ρ 1 , ρ 2 , ρ 3 ; ， i =1、2、3；（1） ； （2） In the formula, U i is the voltmeter reading, I i is the ammeter reading, R 变i is the variable resistance reading, R 线i is the line resistance value, S i is the cross-sectional area of ​​the salt solution in the test tank, L i is the length of the salt solution in the test pool; subscript 1 corresponds to the first test pool (2), subscript 2 corresponds to the second test pool (3), and subscript 3 corresponds to the third test pool (4); the resistivity of the salt solution ρ The final value of is calculated according to the above formula (2); Step 5: After the test is completed, unscrew the outer cover (22) of the test cell, and clean the first test cell (2), the second test cell (3), the third test cell (4) and the electrode (21).

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