Liquid viscosity measuring device and method

Abstract

The invention provides a liquid viscosity measuring device and method.The device comprises a measuring container used for containing liquid to be measured, the top face of the measuring container is in a cone shape extending outwards, a closed control cavity is formed in the top end of the measuring container, and the inner diameter of the control cavity is smaller than the diameter of a measuring steel ball; the measuring steel ball is arranged in the measuring container; the rotating mechanism is used for driving the measuring container to rotate by 180 degrees around the horizontal axis of the measuring container, so that the measuring container is switched between an upright state and an inverted state; one end of the control cavity is directly communicated with the interior of the measuring container, the other end of the control cavity is communicated with the interior of the measuring container through a first pipeline provided with a first stop valve, and the other end of the control cavity is further provided with a pressure relief device used for adjusting the internal pressure of the control cavity. According to the invention, the ball falling time can be accurately measured, so that the liquid viscosity measurement precision is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of liquid viscosity measurement, and in particular relates to a liquid viscosity measurement device and method. Background Art

[0002] The viscosity of liquid is an important fluid dynamics parameter. The viscosity of liquid varies greatly under different pressure and temperature conditions. In numerical simulation calculations, viscosity has a very important influence on the accuracy of the calculation results. At present, there are usually two instruments for measuring the viscosity of liquids. One is to use the principle of rotation method to determine the viscosity of the fluid by measuring the viscous torque of the fluid acting on the rotor or the speed of the rotor. This method cannot measure the viscosity of liquids under high pressure. The other is a method of measuring the viscosity of liquids by the falling ball method. This method usually involves filling a container with the liquid to be tested, dropping a metal ball from the top, and measuring the time it takes for the metal ball to fall to a certain distance. The viscosity of the liquid can be calculated using the corresponding viscosity calculation formula. The falling ball method can be used to measure the viscosity of liquids under high temperature and high pressure conditions by applying pressure and heating in a closed container.

[0003] Accurately measuring the time interval of a metal ball falling in a high pressure sealed container is one of the key factors for accurate viscosity measurement.

[0004] In the current devices for measuring liquid viscosity by the falling ball method under high pressure and high temperature, the electromagnetic force generated by the electromagnetic coil is used to keep the falling ball stagnant at the initial position, and the falling ball is released by disconnecting the power of the electromagnetic coil. However, the metal falling ball still has residual magnetism after the electromagnetic coil is disconnected. There is a time difference between the time when the falling ball starts to fall and the time when the power is disconnected, and it is still affected by the magnetic force during the falling process, resulting in inaccurate measurement; secondly, the position of the falling ball is determined by the change in coil current caused by the falling ball. When the viscosity of the fluid to be measured is large, the falling ball falls slowly, the current change in the induction coil is more sensitive, and the magnetic field generated by the induced current has resistance to the falling ball, which hinders the movement of the falling ball and causes inaccurate measurement. Summary of the invention

[0005] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a liquid viscosity measuring device and method, which can accurately measure the ball falling time, thereby improving the measurement accuracy of liquid viscosity.

[0006] The technical solution adopted by the present invention is: a liquid viscosity measuring device, comprising:

[0007] The measuring container is used to hold the liquid to be measured, and its top surface is in a conical shape extending outward, and a closed control cavity is provided at the top, and the inner diameter of the control cavity is smaller than the diameter of the measuring steel ball;

[0008] A measuring steel ball is arranged inside the measuring container;

[0009] The rotating mechanism is used to drive the measuring container to rotate 180 degrees around its horizontal axis, so that the measuring container can be switched between an upright state and an inverted state;

[0010] A control chamber, one end of which is directly connected to the interior of the measuring container, and the other end of which is connected to the interior of the measuring container through a first pipeline provided with a first stop valve, and the other end of which is also provided with a pressure relief device for adjusting the internal pressure of the control chamber;

[0011] Wherein, the control chamber adjusts the internal pressure through a pressure relief device, which is used to fix the measuring steel ball at the connection between the control chamber and the measuring container; when the internal pressure of the control chamber and the measuring container are made the same by opening the first stop valve, the measuring steel ball falls in the measuring container, and the viscosity of the liquid to be measured is calculated by measuring the time required for the steel ball to fall.

[0012] In the above technical solution, a pressure sensor is arranged in the control chamber; a pressure and temperature sensor is arranged in the measuring container; and the device is configured to determine the starting time of the falling process of the measuring steel ball when the readings of the pressure sensor and the pressure and temperature sensor are equal.

[0013] In the above technical solution, a piezoelectric acceleration sensor is arranged on the bottom surface of the measuring container to detect the impact signal of the measuring steel ball to determine the end time of the falling process of the measuring steel ball.

[0014] In the above technical solution, the pressure relief device includes a second pipeline; the other end of the control chamber is connected to the outside through the second pipeline; and a second stop valve is arranged on the second pipeline.

[0015] The above technical solution also includes a first hydraulic cylinder, a second hydraulic cylinder and a second one-way valve; the first hydraulic cylinder and the second hydraulic cylinder are arranged opposite to each other and the piston rods of the two are connected to each other; the piston rod of the second hydraulic cylinder is controlled by a hydraulic pump; the hydraulic pump controls the second hydraulic cylinder through the second hydraulic cylinder to control the cavity volume of the first hydraulic cylinder; the cavity of the first hydraulic cylinder passes through the second pipeline and is connected to the control cavity through the second stop valve; the second one-way valve is arranged between the end of the second pipeline and the first hydraulic cylinder; the second pipeline is partially shared with the first pipeline; the first hydraulic cylinder is also connected to the measuring container through the part of the second pipeline that is not shared with the first pipeline, through the second stop valve and the first stop valve in sequence.

[0016] The above technical solution also includes a liquid storage container; the liquid storage container is connected to the measuring container through a third pipeline, and is used to hold the liquid to be tested; a high-pressure pump is provided on the third pipeline, and is used to transfer the liquid to be tested from the liquid storage container to the measuring container; the third pipeline is also provided with a third stop valve located between the high-pressure pump and the measuring container.

[0017] In the above technical solution, a voltage regulator is arranged on the third pipeline between the high-pressure pump and the third stop valve; the voltage regulator is connected to the pressure regulating valve; when the liquid pressure in the voltage regulator reaches a preset value, the pressure regulating valve opens.

[0018] In the above technical solution, a first electric heater and a first temperature sensor are arranged in the liquid storage container.

[0019] The above technical solution also includes a constant temperature container; the constant temperature container contains a heat transfer medium; the measuring container and the rotating mechanism are both arranged in the constant temperature container; the constant temperature container is provided with a second electric heater and a second temperature sensor.

[0020] The above technical solution also includes two symmetrically arranged vertically distributed slide rails; a bracket is provided between the slide rails, and the bracket moves up and down along the slide rails; the rotating mechanism is installed on the bracket and is driven by the bracket to move up and down.

[0021] The present invention provides a method for measuring liquid viscosity, which is implemented using the liquid viscosity measuring device described in the above technical solution, and comprises the following steps:

[0022] Place the measuring container in an upright position and add the liquid to be tested until both the measuring container and the control chamber are fully loaded;

[0023] Put the measuring container in an inverted state, adjust the internal pressure of the controller cavity through the pressure relief device, and fix the measuring steel ball at the connection between the control cavity and the measuring container;

[0024] Place the measuring container in an upright position, open the first stop valve, and allow the measuring steel ball to fall into the measuring container;

[0025] The viscosity of the liquid to be tested is calculated by measuring the time required for the steel ball to fall.

[0026] In the above technical solution, during the process of measuring the viscosity of the liquid, the liquid to be measured is maintained at a set temperature, liquid pressure, or set temperature and liquid pressure conditions.

[0027] The beneficial effects of the present invention are as follows: the present invention uses a mechanical method to fix the measuring steel ball and uses the pressure adjustment of the control chamber to release the steel ball, thereby replacing the traditional electromagnetic force fixing method, effectively avoiding the residual magnetism influence generated after the electromagnetic coil is powered off, making the release of the steel ball more precise and not affected by the magnetic force, thereby improving the accuracy of the starting time of the fall and reducing the error.

[0028] Furthermore, the present invention sets pressure and temperature sensors in the control chamber and the measuring container respectively to ensure that the measuring steel ball is released when the pressure is balanced. This design can accurately determine the starting time of the steel ball falling, avoid the time difference problem caused by the power failure of the electromagnetic coil, and further improve the accuracy of the measurement.

[0029] Furthermore, the present invention provides a piezoelectric acceleration sensor for detecting the end moment of the falling of the steel ball, which helps to quickly obtain a signal when the fall is completed, accurately capture the end moment, avoid the influence of resistance caused by the induced magnetic field in the traditional electromagnetic method, and make the measurement more accurate, especially in the case of high-viscosity liquids.

[0030] Furthermore, the present invention provides a pressure relief device in the control chamber, so that the internal pressure can be easily adjusted to control the release state of the steel ball, thereby avoiding the interference of electromagnetic force, achieving accurate fixation and release of the steel ball position, and improving the stability of the equipment and the measurement reliability.

[0031] Furthermore, the present invention can accurately adjust the cavity volume of the first hydraulic cylinder through the relative arrangement of the first hydraulic cylinder and the second hydraulic cylinder and the interconnection of the piston rod, in conjunction with the drive of the hydraulic pump, thereby effectively controlling the pressure in the measuring container. The hydraulic pump adjusts the volume of the first hydraulic cylinder through the second hydraulic cylinder, and can dynamically adjust the liquid pressure in the measuring container under different operating conditions such as initial filling, fixing the steel ball, maintaining negative pressure, and resetting the system, ensuring that the negative pressure condition can be stably maintained inside the measuring container. The setting of the second one-way valve ensures the flow of liquid in a specific direction, prevents the backflow or leakage of the liquid, reduces the risk of system failure, and improves the reliability of the overall system.

[0032] The present invention can measure the viscosity of liquid under negative pressure in the measuring container through precise control of the hydraulic system, thus avoiding interference of external air pressure changes on the measurement results and improving the accuracy and repeatability of the measurement data. The present invention adopts a dual hydraulic cylinder structure to improve the response speed and control accuracy of the system during the pressure regulation process, ensuring that the predetermined negative pressure state can be quickly reached under the operation of the hydraulic pump. The present invention establishes an efficient pressure regulation path through the coordinated work of the first hydraulic cylinder and the second hydraulic cylinder, simplifies the operating steps, and makes it easier and more efficient to achieve negative pressure under specific operating conditions; reasonable hydraulic cylinder configuration and valve control optimize the liquid flow path, reduce the energy loss of the system during the pressure regulation process, and improve the overall operating efficiency.

[0033] The present invention can flexibly adjust the intensity of negative pressure according to the viscosity range and measurement requirements of different liquids to be measured through the combined control of the hydraulic pump and the hydraulic cylinder, and adapt to the measurement requirements of various liquid viscosities. The modular design of the hydraulic system enables the device to expand functions or adjust parameters as needed in the future, and has good adaptability and sustainable development potential.

[0034] Furthermore, the present invention utilizes a high-pressure pump to transfer the liquid to be tested from a liquid storage container to a measuring container, and sets a stop valve on the pipeline to control the flow of the liquid, thereby ensuring that the liquid addition process can be accurately controlled before viscosity measurement, thereby avoiding flow rate or flow instability problems caused by external interference.

[0035] Furthermore, the present invention provides a voltage regulator and a pressure regulating valve on the third pipeline to stabilize the liquid pressure in the pipeline, and opens the pressure regulating valve when the liquid pressure reaches a set value, thereby ensuring that the pressure of the measurement environment is constant according to the set value. This design avoids the obstruction of the falling ball movement by the magnetic field generated by electromagnetic induction, and achieves more accurate pressure control.

[0036] Furthermore, the present invention configures an electric heater and a temperature sensor in the liquid storage container, which can heat the liquid to be measured to a set temperature, ensuring that the liquid to be measured is measured under appropriate temperature conditions. The device avoids measurement errors caused by uneven temperature and improves measurement accuracy.

[0037] Furthermore, the present invention places the measuring container and the rotating mechanism in a constant temperature container, and uses a second electric heater and a temperature sensor to control the temperature in the constant temperature container, ensuring that the measuring container and the liquid to be measured are always maintained at the set temperature, thereby improving the measurement stability and avoiding measurement errors caused by temperature fluctuations.

[0038] Furthermore, the present invention can realize the up and down movement of the measuring container by providing a symmetrical slide rail and a bracket that drives the rotating mechanism, facilitate the rotation operation of the measuring capacity, and facilitate the maintenance and adjustment of the equipment. At the same time, it can effectively reduce the size of the constant temperature container and improve the convenience of operation.

[0039] Furthermore, the present invention fixes or releases the steel ball by adjusting the upright and inverted state of the measuring container, ensuring that the steel ball starts to fall without electromagnetic interference. The viscosity is calculated by time measurement, avoiding the residual magnetism and resistance problems caused by the traditional electromagnetic method, and ensuring the accuracy of the measurement results.

[0040] Furthermore, the present invention maintains a constant pressure after the pressure reaches a preset value, controls the pressure through a voltage-stabilizing tube and a pressure-regulating valve, avoids additional electromagnetic interference, realizes viscosity measurement under constant pressure conditions, and ensures measurement accuracy.

[0041] Furthermore, during the measurement process of the present invention, the temperature of the liquid to be measured is controlled to ensure that the viscosity is measured at a set temperature, thereby avoiding the influence of temperature fluctuations on the viscosity value, making the measurement result more accurate and suitable for high-temperature measurement scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the structure of the present invention.

[0043] Wherein: 1-second electric heater, 2-constant temperature container, 3-bracket, 4-slide rail, 5-measuring container, 6-second temperature sensor, 7-measuring cover, 8-first stop valve, 9-second stop valve, 10-first hydraulic cylinder, 11-first one-way valve, 12-pressure sensor, 13-measuring steel ball, 14-third stop valve, 15-voltage regulator, 16-pressure regulating valve, 17-high-pressure pump, 18-first temperature sensor, 19-first electric heater, 20-liquid storage container, 21-pressure and temperature sensor, 22-piezoelectric acceleration sensor, 23-control chamber, 24-second hydraulic cylinder, 25-second one-way valve, 26-first pipeline, 27-second pipeline. DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not constitute a limitation on the present invention.

[0045] Example 1

[0046] like Figure 1 As shown, the present invention provides a liquid viscosity measuring device, comprising:

[0047] The measuring container 5 is used to hold the liquid to be measured, and its top surface is in a conical shape extending outward, and a closed control cavity 23 is provided at the top, and the inner diameter of the control cavity 23 is smaller than the diameter of the measuring steel ball 13;

[0048] A measuring steel ball 13 is arranged inside the measuring container 5;

[0049] The rotating mechanism is used to drive the measuring container 5 to rotate 180 degrees around its horizontal axis, so that the measuring container 5 can be switched between an upright state and an inverted state;

[0050] The control chamber 23 has one end directly connected to the interior of the measuring container 5 and the other end connected to the interior of the measuring container 5 via a first pipeline 26 provided with a first stop valve 8, and the other end is also provided with a pressure relief device for adjusting the internal pressure of the control chamber 23;

[0051] Among them, the control chamber 23 adjusts the internal pressure through the pressure relief device, which is used to fix the measuring steel ball 13 at the connection between the control chamber 23 and the measuring container 5; when the internal pressure of the control chamber 23 and the measuring container 5 are made the same by opening the first stop valve 8, the measuring steel ball 13 falls in the measuring container 5, and the viscosity of the liquid to be measured is calculated by measuring the time required for the steel ball 13 to fall.

[0052] Preferably, the measuring container 5 includes a measuring container 5 body and a measuring cover 7; the measuring container 5 body and the measuring cover 7 are coaxially matched and tightly connected via a sealing ring to form a sealed measuring container 5. Through the matching of the measuring container 5 body and the measuring cover 7, the internal cleaning of the measuring container 5 can be achieved, so as to be suitable for measuring the viscosity of different liquids.

[0053] Specifically, a pressure sensor 12 is provided in the control chamber 23; a pressure and temperature sensor 21 is provided in the measuring container 5; and the device is configured to determine the starting time of the falling process of the measuring steel ball 13 when the readings of the pressure sensor 12 and the pressure and temperature sensor 21 are equal.

[0054] Preferably, the present invention is further provided with a controller for receiving real-time readings of the pressure sensor 12 and the pressure-temperature sensor 21. When the two are the same, the starting moment of the falling process of the steel ball is determined and recorded for subsequent calculations.

[0055] Specifically, a piezoelectric acceleration sensor 22 is disposed on the bottom surface of the measuring container 5 to detect the impact signal of the measuring steel ball 13 to determine the end time of the falling process of the measuring steel ball 13 .

[0056] Preferably, the controller is also used for the output signal of the piezoelectric acceleration sensor 22, and the moment of receiving the impact signal of the measuring steel ball 13 is taken as the end moment of the falling process of the measuring steel ball 13 and recorded, and the falling process duration of the measuring steel ball 13 is calculated according to the start moment and the end moment of the falling process of the measuring steel ball 13, and then the viscosity of the liquid to be measured is calculated according to the set height of the measuring container 5.

[0057] Specifically, the pressure relief device includes a second pipeline 27 ; the other end of the control chamber 23 is connected to the outside through the second pipeline 27 ; and a second stop valve 9 is provided on the second pipeline 27 .

[0058] Preferably, when the measuring container 5 is inverted, the second stop valve 9 is opened to achieve communication between the control chamber 23 and the outside, so that the liquid to be measured can flow from the control chamber 23 to the outside, thereby reducing the liquid pressure in the control chamber 23. When the controller determines that the liquid pressure inside the measuring container 5 is greater than the liquid pressure inside the control chamber 23 through the received signals from the pressure sensor 12 and the pressure and temperature sensor 21, the second stop valve 9 can be selectively closed to prevent external air from entering.

[0059] Preferably, the end of the second pipeline 27 may be externally connected to a collecting container for collecting the liquid to be tested flowing out through the second pipeline 27 .

[0060] In the process of inputting the liquid to be tested into the measuring container 5, the first stop valve 8 and the second stop valve 9 are opened at the same time. When the liquid to be tested enters the second pipeline 27 from the first pipeline 26 and overflows from the end of the second pipeline 27, it is considered that the container to be tested is in a full load state, and the first stop valve 8 and the second stop valve 9 are controlled to be closed to ensure that the liquid to be tested added subsequently is used to realize the increase of the liquid pressure on the basis of the atmospheric pressure.

[0061] Specifically, it also includes two symmetrically arranged vertically distributed slide rails 4; a bracket 3 is arranged between the slide rails 4, and the bracket 3 moves up and down along the slide rails 4; the rotating mechanism is installed on the bracket 3 and is driven by the bracket 3 to move up and down.

[0062] Preferably, the rotating mechanism is also provided with a limit mechanism to ensure that the measuring container can remain vertical when in an upright and inverted state. The rotating mechanism is arranged above the center of gravity of the measuring container in an upright state to ensure the stability of the liquid introduction process. The rotating axis of the rotating mechanism is located at the middle section of the measuring container to ensure the stability of the rotation process.

[0063] The rotating mechanism is located Figure 1 The back of the measuring container shown in Figure 1 A person skilled in the art can know the shape of the rotating mechanism according to the above description.

[0064] Example 2

[0065] On the basis of Example 1, in order to achieve efficient introduction of the liquid to be tested, Example 2 further includes a liquid storage container 20; the liquid storage container 20 is connected to the measuring container 5 through a third pipeline, and is used to hold the liquid to be tested; a high-pressure pump 17 is provided on the third pipeline, and is used to transfer the liquid to be tested from the liquid storage container 20 to the measuring container 5; and a third stop valve 14 is also provided on the third pipeline, which is located between the high-pressure pump 17 and the measuring container 5. The connection point between the third pipeline and the measuring container 5 is set at the top edge of the measuring container 5.

[0066] Preferably, when it is necessary to input the liquid to be tested into the measuring container 5, pour the liquid to be tested whose volume is larger than the volume of the measuring container 5 into the liquid storage container 20, open the high-pressure pump 17, the first stop valve 8, the second stop valve 9 and the third stop valve 14, so that the liquid to be tested enters the container to be tested from the liquid storage container 20 through the third pipeline.

[0067] Example 3

[0068] On the basis of Example 2, in order to achieve stable measurement of liquid viscosity under set liquid pressure conditions, a voltage regulator tube 15 is provided on the third pipeline, between the high-pressure pump 17 and the third stop valve 14; the voltage regulator tube 15 is connected to the pressure regulating valve 16; when the liquid pressure in the voltage regulator tube 15 reaches a preset value, the pressure regulating valve 16 is opened. The voltage regulator tube 15 is used to ensure the stability of the liquid pressure in the third pipeline and the entire space in the measuring container 5.

[0069] Preferably, when the liquid pressure condition is set to positive pressure, the opening condition of the pressure regulating valve 16 is set to the set pressure value. When the liquid to be tested entering the voltage regulator tube 15 reaches the set pressure value, the pressure regulating valve 16 automatically opens to ensure that the liquid to be tested added subsequently will flow out of the pressure regulating valve 16 and will not enter the measuring container 5; at the same time, when the pressure regulating valve 16 is opened, the third stop valve 14 and the high-pressure pump 17 are closed to ensure that the liquid pressure in the measuring container 5 reaches and does not exceed the set value.

[0070] Example 4

[0071] On the basis of Embodiment 2 or 3, in order to realize the stable measurement of liquid viscosity under the set liquid pressure condition, a first hydraulic cylinder 10, a second hydraulic cylinder 24 and a second one-way valve 25 are further provided. The first hydraulic cylinder 10 and the second hydraulic cylinder 24 are arranged opposite to each other and the piston rods of the two are connected to each other; the piston rod of the second hydraulic cylinder 24 is controlled by the hydraulic pump; the hydraulic pump controls the cavity volume of the first hydraulic cylinder 10 through the second hydraulic cylinder 24; the cavity of the first hydraulic cylinder 10 passes through the second pipeline 27 and is connected to the control cavity through the second stop valve; the second one-way valve 25 is arranged between the end of the second pipeline 27 and the first hydraulic cylinder 10; the second pipeline 27 is partially shared with the first pipeline 26; the first hydraulic cylinder 10 is also connected to the measuring container through the part of the second pipeline 27 that is not shared with the first pipeline 26, through the second stop valve and the first stop valve in sequence. The first hydraulic cylinder 10 is located above the measuring container 5 and the control cavity 23.

[0072] The hydraulic pump is not Figure 1 As shown in FIG. 2 , those skilled in the art are aware of the shape and structure of the hydraulic pump and the connection method thereof with the second hydraulic cylinder 24 .

[0073] Preferably, a first one-way valve 11 is provided between the second stop valve 9 and the first hydraulic cylinder 10 to prevent the liquid to be tested from flowing back. The first one-way valve 11 and the second one-way valve 25 are both used to achieve one-way flow of the liquid to be tested from the measuring container to the end of the second pipeline 27.

[0074] In the process of inputting the liquid to be tested into the measuring container 5, the first stop valve 8, the second stop valve 9, the first check valve 11 and the second check valve 25 are opened at the same time; and the second pipeline 27 is ensured to be unblocked by adjusting the position of the piston rod in the first hydraulic cylinder 10. When the liquid to be tested enters the second pipeline 27 from the first pipeline 26 and overflows from the end of the second pipeline 27 through the first hydraulic cylinder 10, it is considered that the container to be tested is in a full load state, and the first stop valve 8 and the second stop valve 9 are controlled to be closed to ensure that the liquid to be tested added later is used to increase the liquid pressure on the basis of the atmospheric pressure.

[0075] Preferably, when the liquid pressure condition is set to negative pressure, when the liquid to be tested overflows from the end of the second pipeline 27 during the process of feeding the liquid to be tested into the measuring container 5, the third stop valve 14 and the high-pressure pump 17 are closed to stop adding liquid into the measuring container 5. The first stop valve 8 and the second stop valve 9 are kept open, as shown in FIG. Figure 1 As shown, the hydraulic pump controls the piston of the second hydraulic cylinder 24 to move rightward, and the piston of the second hydraulic cylinder 24 drives the piston of the first hydraulic cylinder 10 to move rightward, thereby expanding the cavity space inside the first hydraulic cylinder 10, thereby reducing the liquid pressure inside the measuring container 5.

[0076] The controller can detect the liquid pressure in the measuring container 5 in real time through the feedback signals of the pressure temperature sensor 21 and the pressure sensor 12, and then control the stroke of the hydraulic pump until the liquid pressure in the measuring container 5 reaches a set pressure value.

[0077] Example 5

[0078] On the basis of Embodiment 2, 3 or 4, in order to achieve stable measurement of liquid viscosity under set liquid temperature conditions, a first electric heater 19 and a first temperature sensor 18 are provided in the liquid storage container 20 .

[0079] Preferably, the first electric heater 19 and the first temperature sensor 18 are electrically connected to the controller, and the controller controls the first electric heater 19 through the signal fed back by the first temperature sensor 18 so that the liquid to be tested in the liquid storage container 20 reaches a preset temperature condition.

[0080] Specifically, it also includes a constant temperature container 2; the constant temperature container 2 contains a heat transfer medium; the measuring container 5 and the rotating mechanism are both arranged in the constant temperature container 2; the constant temperature container 2 is provided with a second electric heater 1 and a second temperature sensor 6. The heat transfer medium can be silicone oil. The heat transfer medium has a high specific heat capacity and excellent thermal conductivity. The two act together to enable the heat transfer medium to maintain a stable and uniform temperature while absorbing and releasing a large amount of heat, thereby ensuring that the liquid to be measured in the measuring container is kept at the set temperature.

[0081] Preferably, the second electric heater 1 and the second temperature sensor 6 are electrically connected to the controller, and the controller controls the second electric heater 1 through the signal fed back by the second temperature sensor 6, so that the heat transfer medium in the constant temperature container 2 reaches a preset temperature condition, which is used to ensure that the liquid to be measured in the measuring container 5 is maintained at the set temperature value. At the same time, the pressure temperature sensor 21 can simultaneously detect the temperature of the liquid to be measured in the measuring container 5 and feed back to the controller to ensure that the liquid to be measured reaches the set temperature value.

[0082] Preferably, when the set temperature is lower than the normal temperature of the current liquid to be tested, the first electric heater 19 is not started, and the unheated liquid to be tested is directly introduced into the measuring container 5. A heat transfer medium with a temperature value lower than the set temperature is injected into the constant temperature container 2, and the heat transfer medium is used to cool the liquid to be tested, and the temperature of the heat transfer medium can be adjusted in conjunction with the second electric heater 1 to ensure that the liquid to be tested can meet the set temperature requirement.

[0083] Preferably, two vertically distributed slide rails 4 are symmetrically arranged in the constant temperature container 2; a bracket 3 is arranged between the slide rails 4, and the bracket 3 moves up and down along the slide rails 4; the rotating mechanism is installed on the bracket 3 and is driven by the bracket 3 to move up and down.

[0084] In a specific scenario, the measuring container 5 may be difficult to rotate in the constant temperature container 2 due to the size limitation of the constant temperature container 2, so the measuring container 5 can be moved to the top of the constant temperature container 2 through the slide rail 4, and then moved down into the constant temperature container 2 after rotation. Figure 1 The length of the middle slide rail 4 can be set according to actual needs, extending to the outside of the thermostatic container 2 to ensure that the measuring container 5 is completely moved into the thermostatic container. Alternatively, the slide rail 4 can only extend to the top of the thermostatic container, and an extension mechanism can also be provided on the rotating mechanism. The bracket 3 can reach the top of the thermostatic container 2 along the slide rail 4, and further drive the measuring container 5 to withdraw to the outside of the thermostatic container 2 through the extension mechanism on the rotating mechanism, thereby performing a rotating action.

[0085] Example 6

[0086] The present invention provides a method for measuring liquid viscosity, which is implemented using the liquid viscosity measuring device described in Example 1, and includes the following steps:

[0087] Measuring container 5 preparation:

[0088] The measuring container 5 is placed in an upright state.

[0089] Slowly add the liquid to be tested into the measuring container 5 to ensure that the liquid enters steadily until the measuring container 5 and the control chamber 23 are filled with liquid and reach a full load state.

[0090] Ball positioning:

[0091] The rotating mechanism is started to rotate the measuring container 5 180 degrees around its horizontal axis to put it into an inverted state, ensuring that the measuring steel ball 13 moves to the connection between the control cavity 23 and the measuring container 5 .

[0092] The second stop valve 9 is opened to allow the control chamber 23 to communicate with the outside world through the second pipeline 27. By making the liquid to be measured flow out of the control chamber 23, the liquid pressure in the control chamber 23 is adjusted to be lower than the liquid pressure inside the measuring container 5, so that the steel ball is fixed at the connection between the control chamber and the measuring container by the pressure difference. The internal liquid pressure of the control chamber 23 is detected in real time by the pressure sensor 12, and the internal liquid pressure of the measuring container 5 is detected in real time by the pressure and temperature sensor 21.

[0093] After the steel ball is stably fixed (i.e., the internal liquid pressure difference between the control chamber 23 and the measuring container 5 is greater than the set value, which can ensure that the measuring steel ball 13 does not fall when the measuring container 5 is in an upright state), the second stop valve 9 is closed to ensure that the steel ball remains fixed at the connection between the control chamber 23 and the measuring container 5. At the same time, it is ensured that external air does not enter the control chamber 23.

[0094] Steel ball release:

[0095] The rotating mechanism is started to restore the measuring container 5 to an upright state to ensure that the liquid flows in a stable state.

[0096] The first stop valve 8 is opened to balance the internal pressures of the control chamber 23 and the measuring container 5 , eliminate the pressure difference, and release the steel ball to start falling in the measuring container 5 .

[0097] Time measurement:

[0098] The controller reads the real-time readings of the pressure sensor 12 and the pressure-temperature sensor 21. When the readings of the two are equal, the moment is marked as the starting moment of the steel ball falling and recorded.

[0099] When the steel ball falls to the bottom of the measuring container 5, the piezoelectric acceleration sensor 22 detects a steel ball impact signal, and the controller records this moment as the end moment of the steel ball falling.

[0100] Viscosity calculation:

[0101] The controller calculates the falling time of the steel ball based on the time difference between the starting time and the ending time.

[0102] Based on parameters such as the height of the measuring container 5 , the density of the steel ball, and the density of the liquid, the viscosity of the liquid to be measured is calculated.

[0103] Example 7

[0104] The present invention provides a method for measuring liquid viscosity, which is implemented using the liquid viscosity measuring device described in Example 2. On the basis of Example 6, a step of efficiently introducing the liquid to be measured from the liquid storage container 20 to the measuring container 5 is added:

[0105] Preparation for liquid introduction:

[0106] A sufficient amount of the liquid to be tested is poured into the liquid storage container 20 , the volume of which is larger than the capacity of the measuring container 5 , to ensure that the measuring container 5 can be completely filled.

[0107] Liquid introduction operation:

[0108] The high-pressure pump 17 is turned on to transport the liquid to be measured from the liquid storage container 20 to the measuring container 5 through the third pipeline.

[0109] The first stop valve 8 , the second stop valve 9 and the third stop valve 14 are opened simultaneously to connect the second pipeline 27 with the outside, so as to facilitate the process of the liquid flowing from the third pipeline into the measuring container 5 .

[0110] The liquid to be measured flows into the measuring container 5 along the third pipeline. When the liquid flows out from the outlet of the second pipeline 27, it is confirmed that the measuring container 5 is full.

[0111] Liquid introduction completed:

[0112] The high-pressure pump 17, the first stop valve 8, the second stop valve 9 and the third stop valve 14 are closed to ensure that the measuring container 5 is in a sealed state and prepare for viscosity measurement.

[0113] The steps of Example 1 were repeated: on this basis, steel ball positioning, release, time measurement and viscosity calculation were performed.

[0114] Example 8

[0115] The present invention provides a method for measuring liquid viscosity, which is implemented using the liquid viscosity measuring device described in Example 3. On the basis of Example 7, the step of measuring liquid viscosity under a set positive pressure condition is added:

[0116] Liquid introduction and initial pressure adjustment:

[0117] Add the liquid to be tested into the liquid storage container 20 , and ensure that its volume is larger than the capacity of the measuring container 5 .

[0118] The high-pressure pump 17 is turned on to start the process of the liquid entering the measuring container 5 from the liquid storage container 20 through the third pipeline, and the first stop valve 8, the second stop valve 9 and the third stop valve 14 are opened at the same time. When the liquid flows out from the outlet of the second pipeline 27, it is confirmed that the measuring container 5 is full, and the first stop valve 8 and the second stop valve 9 are closed at this time.

[0119] Voltage stabilization operation:

[0120] The liquid continues to enter the measuring container 5 through the high-pressure pump 17. As the liquid enters the measuring container 5, the liquid pressure in the third pipeline gradually increases. When the pressure reaches the preset value of the voltage regulator tube 15, the pressure regulating valve 16 automatically opens to ensure that the liquid pressure in the third pipeline and the measuring container 5 is constant at the set value.

[0121] When the pressure regulating valve 16 is opened, the high pressure pump 17 and the third stop valve 14 are closed to maintain the internal pressure of the measuring container 5 stable.

[0122] The steps of Example 1 were repeated: steel ball positioning, release, time measurement and viscosity calculation were performed under pressure stability conditions.

[0123] Example 9

[0124] The present invention provides a method for measuring liquid viscosity, which is implemented using the liquid viscosity measuring device described in Example 4. On the basis of any one of Examples 6-8, a step of measuring liquid viscosity under a set negative pressure condition is added:

[0125] Liquid introduction and initial pressure adjustment:

[0126] Add the liquid to be tested into the liquid storage container 20 , and ensure that its volume is larger than the capacity of the measuring container 5 .

[0127] The high-pressure pump 17 is turned on to start the process of liquid entering the measuring container 5 from the liquid storage container 20 through the third pipeline, and the first stop valve 8, the second stop valve 9 and the third stop valve 14 are opened at the same time. When the liquid flows out from the outlet of the second pipeline 27, it is confirmed that the measuring container 5 is full, and the third stop valve 14 and the high-pressure pump 17 are closed at this time.

[0128] Voltage stabilization operation:

[0129] Keep the first stop valve 8 and the second stop valve 9 open. Figure 1 As shown, the hydraulic pump controls the operation of the piston of the second hydraulic cylinder 24, and the piston of the second hydraulic cylinder 24 drives the piston of the first hydraulic cylinder 10 to operate, thereby expanding the cavity space inside the first hydraulic cylinder 10, allowing the liquid to be measured to enter the first hydraulic cylinder 10 from the measuring container 5, thereby reducing the liquid pressure inside the measuring container 5.

[0130] The controller can detect the liquid pressure in the measuring container 5 in real time through the feedback signals of the pressure temperature sensor 21 and the pressure sensor 12, and then control the stroke of the hydraulic pump until the liquid pressure in the measuring container 5 reaches the set pressure value. Then, the first stop valve 8 and the second stop valve 9 are closed to maintain the internal pressure of the measuring container 5 stable.

[0131] The steps of Example 1 were repeated: steel ball positioning, release, time measurement and viscosity calculation were performed under pressure stability conditions.

[0132] Example 10

[0133] The present invention provides a method for measuring liquid viscosity, which is implemented using the liquid viscosity measuring device described in Example 5. On the basis of Examples 7-9, the steps of measuring the liquid viscosity under a set temperature condition (the set temperature value is greater than the room temperature of the liquid to be measured) are added:

[0134] Liquid Heating:

[0135] The first electric heater 19 is started, and the temperature in the liquid storage container 20 is monitored and adjusted through the first temperature sensor 18, so that the liquid to be tested is heated to a set temperature.

[0136] When the temperature reaches a preset value, the first electric heater 19 is turned off to ensure that the temperature of the liquid in the liquid storage container 20 is constant.

[0137] Heating of constant temperature container 2:

[0138] The second electric heater 1 in the thermostatic container 2 is started, heat is transferred using a heat-conducting medium (such as silicone oil), and the medium temperature is monitored by the second temperature sensor 6 to ensure that the temperature of the thermostatic container 2 reaches a set value.

[0139] The controller adjusts the second electric heater 1 through the feedback signal of the second temperature sensor 6 to keep the temperature in the constant temperature container 2 stable, so as to ensure that the temperature of the liquid in the measuring container 5 is constant at a set value.

[0140] Liquid introduction:

[0141] According to the steps of Example 7, the liquid to be tested is introduced from the liquid storage container 20 into the measuring container 5.

[0142] The high-pressure pump 17 is turned on and the first stop valve 8 , the second stop valve 9 and the third stop valve 14 are opened simultaneously, so that the liquid enters the measuring container 5 through the third pipeline.

[0143] Pressure adjustment (this step can be performed selectively or not according to actual needs):

[0144] Execute the steps of Example 8 or 9 to ensure that the liquid pressure in the measuring container 5 reaches and is maintained at the set value.

[0145] Temperature / pressure check:

[0146] The controller reads the data of the pressure and temperature sensor 21 to ensure that the liquid in the measuring container 5 meets the set temperature / pressure requirements, thereby providing a stable environment for viscosity measurement.

[0147] The steps of Example 1 were repeated: steel ball positioning, release, time measurement and viscosity calculation were performed under set temperature and pressure conditions.

[0148] Embodiment 11

[0149] The present invention provides a method for measuring liquid viscosity, which is implemented using the liquid viscosity measuring device described in Example 5. On the basis of any one of Examples 7-10, the step of measuring the liquid viscosity under a set temperature condition (the set temperature value is less than the room temperature of the liquid to be measured) is added:

[0150] Liquid introduction:

[0151] According to the steps of Example 7, the liquid to be tested at room temperature is introduced from the liquid storage container 20 into the measuring container 5.

[0152] Open the high-pressure pump 17 and simultaneously open the first stop valve 8, the second stop valve 9 and the third stop valve 14, so that the liquid enters the measuring container through the third pipeline until the measuring container is fully loaded. At this time, close the third stop valve 14 and the high-pressure pump 17, and no longer add the liquid to be measured into the measuring container.

[0153] Constant temperature container 2 temperature control:

[0154] The thermostatic container 2 contains a heat transfer medium whose temperature is lower than the set temperature value, and uses the heat transfer medium (such as silicone oil) to absorb heat to cool the liquid to be measured in the measuring container. If the temperature of the liquid to be measured drops below the set temperature value, the second electric heater 1 in the thermostatic container 2 is started.

[0155] The controller monitors the medium temperature through the second temperature sensor 6 and the temperature of the liquid to be measured through the pressure temperature sensor, thereby adjusting the second electric heater 1 to ensure that the temperatures of the heat transfer medium in the constant temperature container 2 and the liquid to be measured in the measuring container 5 both reach the set values.

[0156] Pressure adjustment (this step can be performed selectively or not according to actual needs):

[0157] The pressure stabilization operation in Example 8 or 9 is performed to ensure that the liquid pressure in the measuring container 5 reaches and is maintained at the set value. If the pressurization operation in Example 8 is performed, the temperature effect of the newly added liquid to be tested in the measuring container on the existing liquid to be tested in the measuring container is negligible.

[0158] Temperature / pressure check:

[0159] The controller reads the data of the pressure and temperature sensor 21 to ensure that the liquid in the measuring container 5 meets the set temperature / pressure requirements, thereby providing a stable environment for viscosity measurement.

[0160] The steps of Example 1 were repeated: steel ball positioning, release, time measurement and viscosity calculation were performed under set temperature and pressure conditions.

[0161] The present invention can realize the measurement of liquid viscosity under the conditions of negative pressure up to 450MPa and -40°C to 200°C.

[0162] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A liquid viscosity measuring device, characterized in that: include: The measuring container is used to hold the liquid to be measured, and its top surface is in a conical shape extending outward, and a closed control cavity is provided at the top, and the inner diameter of the control cavity is smaller than the diameter of the measuring steel ball; A measuring steel ball is arranged inside the measuring container; The rotating mechanism is used to drive the measuring container to rotate 180 degrees around its horizontal axis, so that the measuring container can be switched between an upright state and an inverted state; A control chamber, one end of which is directly connected to the interior of the measuring container, and the other end of which is connected to the interior of the measuring container through a first pipeline provided with a first stop valve, and the other end of which is also provided with a pressure relief device for adjusting the internal pressure of the control chamber; Wherein, the control chamber adjusts the internal pressure through a pressure relief device, which is used to fix the measuring steel ball at the connection between the control chamber and the measuring container; when the internal pressure of the control chamber and the measuring container are made the same by opening the first stop valve, the measuring steel ball falls in the measuring container, and the viscosity of the liquid to be measured is calculated by measuring the time required for the steel ball to fall.

2. A liquid viscosity measuring device according to claim 1, characterized in that: A pressure sensor is arranged in the control cavity; a pressure and temperature sensor is arranged in the measuring container; and the device is configured to determine the starting time of the falling process of the measuring steel ball when the readings of the pressure sensor and the pressure and temperature sensor are equal.

3. A liquid viscosity measuring device according to claim 1, characterized in that: The bottom surface of the measuring container is provided with a piezoelectric acceleration sensor for detecting the impact signal of the measuring steel ball to determine the termination moment of the falling process of the measuring steel ball.

4. A liquid viscosity measuring device according to claim 1, characterized in that: The pressure relief device comprises a second pipeline; the other end of the control chamber is connected to the outside through the second pipeline; and a second stop valve is arranged on the second pipeline.

5. A liquid viscosity measuring device according to claim 4, characterized in that: It also includes a first hydraulic cylinder, a second hydraulic cylinder and a second one-way valve; the first hydraulic cylinder and the second hydraulic cylinder are arranged opposite to each other and their piston rods are connected to each other; the piston rod of the second hydraulic cylinder is controlled by a hydraulic pump; the hydraulic pump controls the second hydraulic cylinder through the second hydraulic cylinder to control the cavity volume of the first hydraulic cylinder; the cavity of the first hydraulic cylinder passes through the second pipeline and is connected to the control cavity through the second stop valve; the second one-way valve is arranged between the end of the second pipeline and the first hydraulic cylinder; the second pipeline is partially shared with the first pipeline; the first hydraulic cylinder is also connected to the measuring container through the part of the second pipeline that is not shared with the first pipeline, through the second stop valve and the first stop valve in sequence.

6. A liquid viscosity measuring device according to claim 5, characterized in that: It also includes a liquid storage container; the liquid storage container is connected to the measuring container through a third pipeline and is used to hold the liquid to be tested; a high-pressure pump is arranged on the third pipeline and is used to transfer the liquid to be tested from the liquid storage container to the measuring container; the third pipeline is also provided with a third stop valve located between the high-pressure pump and the measuring container.

7. A liquid viscosity measuring device according to claim 6, characterized in that: A pressure-stabilizing tube is arranged on the third pipeline between the high-pressure pump and the third stop valve; the pressure-stabilizing tube is connected to the pressure regulating valve; when the liquid pressure in the pressure-stabilizing tube reaches a preset value, the pressure regulating valve opens.

8. A liquid viscosity measuring device according to claim 6, characterized in that: The liquid storage container is provided with a first electric heater and a first temperature sensor; it also includes a constant temperature container; the constant temperature container contains a heat transfer medium; the measuring container and the rotating mechanism are both provided in the constant temperature container; the constant temperature container is provided with a second electric heater and a second temperature sensor.

9. A liquid viscosity measuring device according to claim 1, characterized in that: It also includes two symmetrically arranged vertically distributed slide rails; a bracket is arranged between the slide rails, and the bracket moves up and down along the slide rails; the rotating mechanism is installed on the bracket and is driven by the bracket to move up and down.

10. A method for measuring liquid viscosity, characterized in that: The method is implemented by using a liquid viscosity measuring device according to any one of claims 1 to 9, comprising the following steps: Place the measuring container in an upright position and add the liquid to be tested until both the measuring container and the control chamber are fully loaded; Put the measuring container in an inverted state, adjust the internal pressure of the controller cavity through the pressure relief device, and fix the measuring steel ball at the connection between the control cavity and the measuring container; Place the measuring container in an upright position, open the first stop valve, and allow the measuring steel ball to fall into the measuring container; The viscosity of the liquid to be tested is calculated by measuring the time required for the steel ball to fall.

11. A method for measuring liquid viscosity according to claim 10, characterized in that: During the liquid viscosity measurement process, the liquid to be measured is maintained at a set temperature, liquid pressure, or set temperature and liquid pressure conditions.

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