Constant-temperature viscosity testing device

Abstract

The invention discloses a constant-temperature viscosity testing device, and aims to solve the problem that the temperature is not easy to control in the existing kinematic viscosity testing process. According to the constant-temperature viscosity testing device, a main machine, a supporting arm and a water bath are arranged on a base, a heater is arranged in the water bath, a water bath cover covers the water bath, at least one through hole is formed in the water bath cover, a viscosity tube is inserted into the through hole, a clamp can be arranged at the through hole, and a stirrer and a two-stage refrigerator are installed on the supporting arm. The stirrer extends into the water bath, and the two-stage refrigerator is communicated with the water bath through a pipeline. According to the invention, a medium in the water bath is heated by the heater in the water bath, and the medium is cooled by the two-stage refrigerator on the supporting arm, so that the temperature regulation range of the medium in the water bath is wider, and the temperature control in the viscosity testing process is more stable.

Description

TECHNICAL FIELD

[0001] The present application relates to a constant-temperature viscosity testing device. BACKGROUND

[0002] As a key indicator of oil products, viscosity is of great significance in many fields.

[0003] In chemical production, the production and use of many liquid products such as polymers, coatings, organic solvents, etc. cannot be separated from the measurement of viscosity. By measuring the viscosity of these products, their rheological properties can be evaluated, the production process can be optimized, and product quality can be improved. In oil trading, viscosity is also one of the important indicators for evaluating oil quality. Viscosity testing is used to verify the viscosity of oil products to ensure that the quality of traded oil meets contract requirements. In the automotive industry, the viscosity of engine oil has a significant impact on the performance of cars under different operating conditions. The right viscosity can ensure that the engine is well lubricated, reducing wear and tear and extending the service life. In the field of aerospace, the viscosity of aviation fuel and aviation lubricating oil is directly related to flight safety and must maintain good fluidity under various extreme conditions.

[0004] Viscosity testing methods include Brookfield viscosity, Engler viscosity, and kinematic viscosity. Kinematic viscosity is the most widely used method for testing a wide range of conditions, with the simplest operation and most affordable price. The kinematic viscosity constant-temperature tank can only be heated, and cannot be cooled, which greatly limits the control and use of kinematic viscosity during testing. In places or seasons with high temperatures, low-temperature viscosity testing is often very complex and even difficult to operate. According to GB / T 265-1983, the kinematic viscosity constant-temperature tank is suitable for temperatures of -50 to 100 degrees Celsius. Therefore, developing a constant-temperature viscosity testing device with a wide temperature range is an effective way to improve testing accuracy. SUMMARY

[0005] The present application aims to solve the problem of temperature control in the existing kinematic viscosity measurement process and provide a constant-temperature viscosity testing device.

[0006] The constant-temperature viscosity testing device of the present application includes a main machine, a base, a water bath, a stirrer, a water bath cover, a support arm, a heater, and a two-stage cooler (TEC). The main machine, support arm, and water bath are arranged on the base. The heater is arranged inside the water bath. The water bath cover is arranged on the water bath. At least one through hole is formed in the water bath cover. The viscosity tube (capillary viscometer) is inserted into the through hole. The stirrer and two-stage cooler are installed on the support arm, and the stirrer extends into the water bath.

[0007] One end of the water inlet pipeline is connected with the water outlet of the water bath, the other end of the water inlet pipeline is connected with the medium inlet of the double-stage refrigerator, one end of the water return pipeline is connected with the medium outlet of the double-stage refrigerator, and the other end of the water return pipeline is connected with the water inlet of the water bath.

[0008] Firstly, the water bath is filled with appropriate water or other liquid medium, and the water quantity is kept higher than the minimum water injection range. After a certain time, the device is started, the stirrer is started, and the liquid in the circulating water bath is continuously stirred. The temperature sensor automatically monitors the temperature of the water and compares it with the preset temperature of the device, automatically judges the current working condition of the device, if the temperature of the liquid in the water bath is lower than the preset temperature, the heating wire starts to heat, and the frequency conversion heating function is started at the same time, and the temperature is stabilized to the preset temperature through negative feedback adjustment. If the temperature of the liquid in the water bath is higher than the preset temperature, it proves that the environmental temperature is too high, and the inlet and outlet water pipes will be started by the temperature sensor, and the liquid is sucked into the external cooling device through the water pump system, and the double-stage refrigeration piece TEC starts to refrigerate, so that the water temperature is reduced, and the temperature is stabilized to the preset temperature through the negative feedback mode of the temperature sensor.

[0009] After the experiment starts, press the manual limiter, the elastic clamp is contracted, the clamping piece is opened, the capillary viscometer is placed in the clamp, and the manual limiter is released, and the clamping piece clamps the capillary viscometer. After completion, the elastic clamp is placed in the hole at the top of the water bath for preheating of the viscosity tube. After preheating, the liquid to be measured is drawn into the optimal range by using the ear cleaning ball, and after being released, the time is recorded on the screen of the host. The host screen can also input the capillary coefficient, and the liquid viscosity characteristics and viscosity index can be calculated synchronously, so that the researchers can record data conveniently.

[0010] The constant-temperature viscosity testing device can heat or cool the medium in the water bath, the temperature regulation range of the medium in the water bath is wider, and the temperature control during the viscosity testing process is more stable. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a whole structure schematic view of the constant-temperature viscosity testing device.

[0012] Figure 2 It is a structure schematic view of the clamp in the ninth embodiment.

[0013] Figure 3 It is a structure schematic view of the water bath cover. EMBODIMENT

[0014] Specific embodiment one: the constant temperature viscosity testing device includes a main machine 1, a base 2, a water bath 3, a stirrer 4, a water bath cover 5, a support arm 6, a heater 7 and a double-stage refrigeration device (TEC) 8, the main machine 1, the support arm 6 and the water bath 3 are arranged on the base 2, the heater 7 is arranged in the water bath 3, the water bath cover 5 is arranged on the water bath 3, at least one through hole 5-1 is formed in the water bath cover 5, a viscosity tube (capillary viscometer) is inserted into the through hole 5-1, the stirrer 4 and the double-stage refrigeration device 8 are arranged on the support arm 6, and the stirrer 4 extends into the water bath 3.

[0015] One end of a water inlet pipeline 9-1 is connected with a water outlet of the water bath 3, the other end of the water inlet pipeline 9-1 is connected with a medium inlet of the double-stage refrigeration device 8, one end of a water return pipeline 9-2 is connected with a medium outlet of the double-stage refrigeration device 8, and the other end of the water return pipeline 9-2 is connected with a water inlet of the water bath 3.

[0016] Specific embodiment two: different from the specific embodiment one, the main machine 1 is provided with an LCD display screen.

[0017] Specific embodiment three: different from the specific embodiment one or two, a temperature sensor 11 is arranged in the water bath 3.

[0018] Specific embodiment four: different from any one of the specific embodiments one to three, the stirrer 4 is driven to rotate by a motor.

[0019] Specific embodiment five: different from any one of the specific embodiments one to four, the water bath 3 is fixedly arranged on the base 2.

[0020] Specific embodiment six: different from any one of the specific embodiments one to five, the heater 7 is a resistance wire heater.

[0021] Specific embodiment seven: different from any one of the specific embodiments one to six, a circulating pump is arranged on the water inlet pipeline 9-1.

[0022] Specific embodiment eight: different from any one of the specific embodiments one to seven, a clamp 12 is arranged on the through hole 5-1.

[0023] Specific implementation nine: the difference between this embodiment and specific implementation eight is that the clamp 12 includes a circular ring 12-2 and two sets of limiters, which are centrally symmetric and arranged inside the circular ring 12-2. The limiters include a button 12-1, a limiting piece 12-3, a rotating shaft 12-4, and a spring 12-5. The button 12-1 protrudes radially outside the circular ring 12-2. Part of the limiting piece 12-3 protrudes from the inner ring of the circular ring 12-2. One end of the limiting piece 12-3 abuts against the button 12-1. The other end of the limiting piece 12-3 is provided with the spring 12-5, which is arranged radially along the circular ring 12-2. The other end of the spring 12-5 is fixed to the outer ring wall of the circular ring 12-2. The middle part of the limiting piece 12-3 is rotationally connected to the circular ring 12-2 through the rotating shaft 12-4.

[0024] The two sets of limiters in this embodiment have the same structure. Pressing the button 12-1 causes the limiting piece 12-3 to retract into the circular ring 12-2. The viscosity tube is placed in the clamp. Releasing the button 12-1 causes the part of the limiting piece 12-3 protruding from the circular ring 12-2 to clamp the viscosity tube.

[0025] Specific implementation ten: the difference between this embodiment and specific implementation nine is that the limiting piece 12-3 is arc-shaped.

[0026] Embodiment: The constant temperature viscosity testing device includes a main machine 1, a base 2, a water bath tank 3, a stirrer 4, a water bath tank cover 5, a support arm 6, a heater 7, and a double-stage refrigerating machine (TEC) 8. The main machine 1, the support arm 6, and the water bath tank 3 are arranged on the base 2. The main machine 1 is provided with an LCD display screen and a timing button. The heater 7 and a temperature sensor 11 are arranged inside the water bath tank 3. The water bath tank cover 5 is arranged on the water bath tank 3. At least one through hole 5-1 is opened on the water bath tank cover 5. The clamp 12 is arranged on the through hole 5-1. The clamp 12 includes a circular ring 12-2 and two sets of limiters. The two sets of limiters, which have the same structure, are arranged inside the circular ring 12-2 and are centrally symmetric. The limiters include a button 12-1, a limiting piece 12-3, a rotating shaft 12-4, and a spring 12-5. The button 12-1 protrudes radially outside the circular ring 12-2. The limiting piece 12-3 is arc-shaped and partially protrudes from the inner ring of the circular ring 12-2. One end of the limiting piece 12-3 abuts against the button 12-1. The other end of the limiting piece 12-3 is provided with the spring 12-5, which is arranged radially along the circular ring 12-2. The other end of the spring 12-5 is fixed to the outer ring wall of the circular ring 12-2. The middle part of the limiting piece 12-3 is rotationally connected to the circular ring 12-2 through the rotating shaft 12-4. The rotating shaft 12-4 is arranged along the thickness direction of the circular ring 12-2.

[0027] The viscosity tube (capillary viscometer) is inserted into the ring member 12-2 of the clamp 12, the stirrer 4 and the two-stage refrigerator 8 are installed on the support arm 6, and the stirrer 4 extends into the water bath 3;

[0028] One end of the water inlet pipeline 9-1 is connected with the water outlet of the water bath 3, the other end of the water inlet pipeline 9-1 is connected with the medium inlet of the two-stage refrigerator 8, one end of the water return pipeline 9-2 is connected with the medium outlet of the two-stage refrigerator 8, and the other end of the water return pipeline 9-2 is connected with the water inlet of the water bath 3.

[0029] In this embodiment, ADS124S08 is used for precise temperature control, and the temperature control accuracy is 0.1℃. The temperature control module is realized by an auxiliary sub-board. An STM32G4 receives the preset temperature target of the main board, runs a fast local PID control cycle, adjusts the PWM output in real time, and accurately controls the heating and refrigeration temperature through a solid-state relay (SSR) and an H-bridge circuit. The main machine 1 is provided with a storage module, which facilitates equipment upgrading and data export.

[0030] In this embodiment, the constant temperature viscosity test device is used to perform the constant temperature viscosity test process as follows:

[0031] At the initial stage of starting the device, deionized water meeting the minimum water level requirement is injected into the water bath of the device, the total power of the equipment is started, and the experimental temperature, stirring paddle speed, capillary coefficient (which can not be set) and other contents are set according to the specific experimental method. After confirming the information, the equipment will automatically run and automatically monitor the temperature in the water bath, compare the water temperature with the preset temperature, and automatically use appropriate heating or cooling means for temperature control. The heating means is resistance wire heating, and finally constant temperature, and the cooling is a two-stage refrigeration piece TEC working, and finally constant temperature is realized. After the temperature is stable, the viscometer with the sample is placed in the device from the top of the water bath, and the clamp is clamped in the placement position to prevent the viscometer from sliding. After constant temperature for 30 minutes, the viscometer is fully constant temperature, and then the experiment can be carried out according to the standard requirements. After the sample is taken, when the sample position reaches the starting position, press the timing button on the main machine, and the equipment starts timing. When the sample reaches the end position, press the timing button again, and the timing ends. At this time, the device record will display the kinematic viscosity of the sample (if the capillary coefficient is not set, only the time is displayed).

[0032] The constant temperature viscosity test device of this embodiment has a sample recording function, has a data export function, and can directly export data.

Claims

1. A constant-temperature viscosity testing device, characterized in that... The constant temperature viscosity test device includes a main unit (1), a base (2), a water bath (3), a stirrer (4), a water bath cover (5), a support arm (6), a heater (7), and a two-stage cooler (8). The main unit (1), the support arm (6), and the water bath (3) are set on the base (2). A heater (7) is set inside the water bath (3). The water bath cover (5) is placed on the water bath (3). At least one through hole (5-1) is opened on the water bath cover (5). The viscosity tube is inserted into the through hole (5-1). The stirrer (4) and the two-stage cooler (8) are installed on the support arm (6). The stirrer (4) extends into the water bath (3). One end of the inlet pipe (9-1) is connected to the outlet of the water bath (3), and the other end of the inlet pipe (9-1) is connected to the medium inlet of the two-stage refrigerator (8). One end of the return pipe (9-2) is connected to the medium outlet of the two-stage refrigerator (8), and the other end of the return pipe (9-2) is connected to the inlet of the water bath (3).

2. The isothermal viscosity testing device according to claim 1, characterized in that... An LCD display screen is installed on the host (1).

3. The isothermal viscosity testing device according to claim 1, characterized in that... A temperature sensor (11) is installed inside the water bath (3).

4. The isothermal viscosity testing device according to claim 1, characterized in that... The stirrer (4) is driven to rotate by a motor.

5. The isothermal viscosity testing device according to claim 1, characterized in that... The water bath (3) is fixedly installed on the base (2).

6. The isothermal viscosity testing device according to claim 1, characterized in that... The heater (7) is a resistance wire heater.

7. The isothermal viscosity testing device according to claim 1, characterized in that... A circulation pump is installed on the water inlet pipe (9-1).

8. The isothermal viscosity testing device according to claim 1, characterized in that... A clamp (12) is provided on the through hole (5-1).

9. The isothermal viscosity testing device according to claim 8, characterized in that... The clamp (12) includes a circular ring (12-2) and two sets of limiters. The two sets of limiters are centrally symmetrical and arranged inside the circular ring (12-2). Each limiter includes a button (12-1), a limiter (12-3), a rotating shaft (12-4), and a spring (12-5). The button (12-1) protrudes radially outward along the circular ring (12-2), and a portion of the limiter (12-3) protrudes beyond the circular ring (12-2). The inner ring has one end of the limiting member (12-3) abutting against the button (12-1), and the other end of the limiting member (12-3) is provided with a spring (12-5). The spring (12-5) is arranged radially along the ring member (12-2), and the other end of the spring (12-5) is fixed on the outer ring wall of the ring member (12-2). The middle part of the limiting member (12-3) is rotatably connected to the ring member (12-2) through the rotating shaft (12-4).

10. The isothermal viscosity testing device according to claim 9, characterized in that... The limiting member (12-3) is arc-shaped.

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