Non-Newtonian fluid viscosity detection device and method

Abstract

The invention discloses a non-Newtonian fluid viscosity detection device, and the detection device comprises a first container which is used for accommodating a to-be-detected liquid and is communicated with an external to-be-detected liquid transmission channel; the rotating shaft is rotatably mounted, and one end of the rotating shaft extends into the first container; the first rotating drum is positioned in the first container and is fixedly connected with one end of the rotating shaft; the air passage is communicated with the inside and the outside of the first container and is used for introducing first positive pressure gas into the first container so as to adjust the height of the liquid level of the to-be-measured liquid; and the speed measuring unit is connected with the rotating shaft and is used for detecting the rotating speed of the rotating shaft. According to the detection device, the invention further provides a non-Newtonian fluid viscosity detection method. The first positive pressure gas enters the first container through the gas channel, when the height of the liquid level is increased, the pressure of the first positive pressure gas is increased, the liquid level is lowered, when the height of the liquid level is lowered, the pressure of the first positive pressure gas is reduced, the liquid level is raised, and therefore the liquid level is kept stable.

Description

Technical Field

[0001] This application relates to the field of liquid viscosity detection. Specifically, it relates to a non-Newtonian fluid viscosity detection device and method. Background Art

[0002] The drilling fluid commonly used in the field of drilling engineering is called the "blood" of drilling. It is a complex mixture of a suspension and a colloidal solution formed by stirring clay, water, and some inorganic or organic chemical treatment agents. It is a time-independent non-Newtonian fluid system with shear thinning characteristics. It usually contains components such as water, oil, high molecular polymers, cuttings, iron filings, and natural gas. It has strong heterogeneity and is generally alkaline (pH 10 - 14). The fluid viscosity varies within a large range with changes in temperature, pressure, and flow rate. It can be roughly divided into three categories according to its composition: water-based drilling fluid, oil-based drilling fluid, and synthetic-based drilling fluid.

[0003] In the field of drilling engineering, the rheology of drilling fluid refers to the characteristics of the drilling fluid flowing and deforming under the action of external forces, among which flow is the main aspect. Viscosity is one of the important parameters of the rheology of drilling fluid. There are requirements for the viscosity of the drilling fluid used at the drilling site. If the viscosity of the drilling fluid is too low, it will reduce the rock-carrying capacity of the drilling fluid, unable to effectively remove the rock debris at the bottom of the well, and scour the wellbore, resulting in problems such as wellbore collapse; if the viscosity of the drilling fluid is too high, it will lead to problems such as too high pump starting pressure, decreased drilling speed, and blockage of the drilling fluid at the drilling mouth.

[0004] Currently, in the field of drilling engineering, the method of manually sampling and returning to the laboratory to detect the viscosity of drilling fluid is mainly adopted. The data obtained from laboratory testing lags far behind engineering calculations, and the conditions such as temperature and pressure during testing are quite different from the actual flow environment of the drilling fluid. Therefore, the accuracy of the test results is relatively low.

[0005] In order to obtain viscosity data in a timely manner, on-site real-time detection during drilling operations is required. When using the common cyclone method to measure the viscosity of drilling fluid, it is necessary to inject the drilling fluid into a container and then immerse the rotating cylinder of the detection device in the drilling fluid. The ratio of the immersion depth (i.e., the distance from the top of the rotating cylinder to the liquid surface) to the height of the rotating cylinder needs to be controlled within a certain range. If the ratio exceeds this range, the detected data will deviate significantly from the actual data. To achieve on-line detection, the detection device needs to be connected to the transmission channel of the drilling fluid. The drilling fluid to be measured is injected into the container of the detection device by a pump in real time and discharged in real time. That is, the container of the detection device can be regarded as a part of the transmission channel. Under the complex influence of various factors at the drilling site, the flow rate and pressure of the drilling fluid pumped into the detection device cannot be stabilized, and the liquid level height in the container of the detection device will fluctuate with the changes in the flow rate and pressure. The position of the rotating cylinder of the existing detection device is fixed, so the immersion depth of the rotating cylinder is easily beyond the allowable range with the fluctuation of the liquid level height, resulting in inaccurate detection data. An overly high liquid level may also cause the drilling fluid to enter components such as the bearings, control circuits, and sensors of the detection device, causing equipment damage. In addition, the drilling operation site is hot and humid, filled with corrosive vapors, dust, and other substances. Prolonged exposure to this environment will damage the components in the detection device and affect the service life of the detection device. Summary of the Invention

[0006] The main purpose of this application is to propose a non-Newtonian fluid viscosity detection device and method, aiming to solve the above problems existing in the prior art.

[0007] To achieve the above object, this application provides a non-Newtonian fluid viscosity detection device, which includes:

[0008] A first container for containing the liquid to be measured and connected to the external transmission channel of the liquid to be measured;

[0009] A rotating shaft rotatably installed, with one end extending into the first container;

[0010] A first rotating cylinder located in the first container and fixedly connected to one end of the rotating shaft;

[0011] An air passage connecting the inside and outside of the first container, used to introduce a first positive pressure gas into the first container to adjust the height of the liquid level of the liquid to be measured;

[0012] A speed measurement unit connected to the rotating shaft, used to detect the rotation speed of the rotating shaft.

[0013] Furthermore,

[0014] The air passage is located inside the rotating shaft and extends along the axial direction of the rotating shaft;

[0015] The rotating shaft further includes:

[0016] The first air hole is located on the rotating shaft and communicates the air duct with the first container.

[0017] Further, the first container includes a liquid inlet and a liquid outlet, which are used to communicate with an external liquid transmission channel to be measured. The liquid inlet and the liquid outlet are respectively located on both sides of the first container, and the position of the liquid inlet is lower than that of the liquid outlet.

[0018] Further, the detection device further includes:

[0019] A baffle plate is arranged above the first air hole in the first container;

[0020] The baffle plate is installed on the rotating shaft or the side wall of the first container.

[0021] Further, the top of the rotating shaft is sealed;

[0022] The rotating shaft further includes:

[0023] A second air hole is located on the rotating shaft and communicates the air duct with the external space of the rotating shaft.

[0024] Further, the detection device further includes a bearing seat. The bearing seat includes a seat body, and an accommodation space is provided in the seat body. The seat body is located outside the first container, the seat body is installed on the upper wall of the first container, and a third air hole communicating the internal and external spaces is provided on the side surface of the seat body;

[0025] The rotating shaft further includes a fitting section, and the fitting section is located in the accommodation space;

[0026] The second air hole is located at the fitting section.

[0027] Further, at least one float is fixedly installed at the position corresponding to the fitting section on the rotating shaft. The float is hollow inside and has an open bottom, and the internal space of the float communicates with the second air hole.

[0028] Further, at least one float is fixedly installed at the position corresponding to the fitting section on the rotating shaft. The bearing seat further includes a permanent magnet fixed on the seat body and a magnetic fluid provided in the accommodation space;

[0029] The magnetic fluid is constrained by the permanent magnet to fill the gap between the at least one float and the bottom surface of the seat body.

[0030] Further,

[0031] At least one of the floats includes a conductive material;

[0032] The bearing seat further includes:

[0033] An electromagnetic coil, which is arranged circumferentially along the inner wall of the seat body and is used to reduce the rotation speed of the at least one float after being energized.

[0034] Further,

[0035] The seat body further includes:

[0036] An inner shell, which encloses the accommodation space;

[0037] An outer shell, which encloses the inner shell, and a hollow inner space is formed between the outer shell and the inner shell;

[0038] A fourth air hole, which penetrates the outer shell and is used to connect with a second external air source to introduce a second positive-pressure gas into the inner space, and the pressure of the second positive-pressure gas is greater than that of the first positive-pressure gas;

[0039] At least one elastic membrane, which is embedded on the inner shell and is used to expand inwards under the action of the second positive-pressure gas and squeeze at least one of the floats.

[0040] Further,

[0041] The seat body further includes:

[0042] A fifth air hole, which penetrates the outer shell and is used to discharge the second positive-pressure gas.

[0043] Further, the detection device further includes:

[0044] A rotating cylinder seat, which is located outside the first container and is installed on the upper wall of the first container, and the bearing seat is located inside the rotating cylinder seat;

[0045] A second rotating cylinder, which is directly or indirectly rotatably connected to the rotating cylinder seat, is located inside the first container and is coaxially arranged outside the first rotating cylinder, and includes an opening and a plurality of pressure relief holes;

[0046] The opening is located below the liquid level during detection;

[0047] The plurality of pressure relief holes are located above the liquid level during detection.

[0048] Further,

[0049] The detection device further includes:

[0050] A second container, which is arranged above the first container;

[0051] The rotating cylinder seat is located inside the second container.

[0052] Further,

[0053] The detection device further includes:

[0054] The first air rod, one end of which is used to connect to the first external air source, and the other end sequentially passes through the second container and the rotating cylinder base and then connects to the third air hole;

[0055] The first valve, which is arranged on the first air rod and is used to control the on-off of the first air rod;

[0056] The second air rod, one end of which is used to connect to the second external air source, and the other end sequentially passes through the second container and the rotating cylinder base and then connects to the fourth air hole;

[0057] The second valve, which is arranged on the second air rod and is used to control the on-off of the second air rod;

[0058] The third air rod, which sequentially passes through the second container and the rotating cylinder base from the outside of the second container and then connects to the fifth air hole, serving as the discharge channel for the second positive-pressure gas;

[0059] The third valve, which is arranged on the third air rod and is used to control the on-off of the third air rod;

[0060] The fourth valve, which is used to control the on-off of the liquid inlet;

[0061] The fifth valve, which is used to control the on-off of the liquid outlet.

[0062] Further, the top of the first container is open, and a partition is installed on the top of the first container, and the partition serves as the upper wall of the first container.

[0063] Further, the detection device further includes:

[0064] A liquid level detection unit, which is connected to the first container and is used to detect the liquid level height.

[0065] Further, the detection device further includes:

[0066] A control unit, which is connected to the liquid level detection unit and is used to adjust the pressure of the first positive-pressure gas according to the liquid level height.

[0067] Further,

[0068] The detection device further includes:

[0069] A driving unit, which is fixed in the second container and is connected to the rotating cylinder base and is used to drive the second rotating cylinder to rotate at a preset speed.

[0070] This application also provides a non-Newtonian fluid viscosity detection method, and the method is used for a non-Newtonian fluid viscosity detection device as described above;

[0071] The method includes:

[0072] Connect the first container to an external transmission channel for the liquid to be measured, so that the liquid to be measured continuously flows through the first container and submerges the first rotating cylinder.

[0073] Introduce a first positive-pressure gas above the liquid to be measured in the first container to adjust the first rotating cylinder to a preset immersion depth.

[0074] Drive the first rotating cylinder to rotate to a preset speed and then stop.

[0075] Measure the decay rate parameter of the rotation speed of the first rotating cylinder.

[0076] Calculate the viscosity of the liquid to be measured according to the decay rate parameter.

[0077] This application also provides a method for detecting the viscosity of a non-Newtonian fluid, and the method is used for the non-Newtonian fluid viscosity detection device described above.

[0078] The method includes:

[0079] Connect the first container to an external transmission channel for the liquid to be measured, so that the liquid to be measured continuously flows through the first container and submerges the first rotating cylinder.

[0080] Introduce a first positive-pressure gas above the liquid to be measured in the first container to adjust the first rotating cylinder to a preset immersion depth.

[0081] Drive the second rotating cylinder to rotate to a preset speed.

[0082] Measure the rotation speed or torque of the first rotating cylinder.

[0083] Calculate the viscosity of the liquid to be measured according to the rotation speed or torque of the first rotating cylinder.

[0084] The advantages of this application are as follows:

[0085] In the non-Newtonian fluid viscosity detection device provided by this application, during detection, the first positive-pressure gas enters the interior of the first container through the air duct, so that a positive-pressure environment is formed above the liquid to be measured inside the first container. When the liquid level height increases, increase the pressure of the first positive-pressure gas to make the liquid level drop; when the liquid level height decreases, decrease the pressure of the first positive-pressure gas to make the liquid level rise, thereby maintaining the stability of the liquid level, and further reducing the change range of the immersion depth of the first rotating cylinder, so that the online continuous measurement result of the liquid viscosity is more accurate. On the other hand, the first positive-pressure gas keeps the interior of the first container in a high-pressure state all the time, which can effectively block harmful substances such as corrosive vapors, liquids or dust from overflowing from the first container, avoid damage to the measuring structure by harmful substances, and effectively increase the service life of the overall device. Description of the Drawings

[0086] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0087] The methods, systems, and / or programs in the accompanying drawings will be further described according to exemplary embodiments. These exemplary embodiments will be described in detail with reference to the drawings. These exemplary embodiments are non-limiting exemplary embodiments, where reference numerals represent similar mechanisms in various views of the drawings.

[0088] Figure 1 It is a schematic structural diagram of a non-Newtonian fluid viscosity detection device related to some embodiment solutions of the present application;

[0089] Figure 2 It is a schematic structural diagram of a non-Newtonian fluid viscosity detection device related to other embodiment solutions of the present application;

[0090] Figure 3 It is a schematic structural diagram of a non-Newtonian fluid viscosity detection device with a baffle related to some embodiment solutions of the present application;

[0091] Figure 4 It is a schematic structural diagram of a non-Newtonian fluid viscosity detection device with a float related to some embodiment solutions of the present application;

[0092] Figure 5 It is a schematic structural diagram of a non-Newtonian fluid viscosity detection device with a magnetic fluid and a permanent magnet related to some embodiment solutions of the present application;

[0093] Figure 6 It is a schematic structural diagram of a non-Newtonian fluid viscosity detection device with an electromagnetic coil related to some embodiment solutions of the present application;

[0094] Figure 7 It is a schematic structural diagram of a non-Newtonian fluid viscosity detection device with an elastic membrane related to some embodiment solutions of the present application;

[0095] Figure 8 For Figure 7 it is a schematic structural diagram of the non-Newtonian fluid viscosity detection device after the elastic membrane expands;

[0096] Figure 9 For Figure 7 it is a schematic structural diagram of the bearing seat and the elastic membrane of the non-Newtonian fluid viscosity detection device from another perspective;

[0097] Figure 10Schematic structural diagram of a non-Newtonian fluid viscosity detection device with a second rotating cylinder and a rotating cylinder base according to some embodiments of the present application;

[0098] Figure 11 Schematic structural diagram of a non-Newtonian fluid viscosity detection device with a second container according to some embodiments of the present application.

[0099] Icons: 100 - detection device, 111 - first container, 112 - second container, 113 - liquid inlet, 114 - liquid outlet, 115 - liquid level, 120 - partition board, 200 - second rotating cylinder, 210 - opening, 220 - pressure relief hole, 300 - first rotating cylinder, 400 - rotating shaft, 401 - transfer pipe, 410 - air duct, 420 - first air hole, 430 - baffle, 440 - mating section, 450 - second air hole, 460 - float, 500 - bearing seat, 510 - seat body, 520 - accommodation space, 530 - third air hole, 540 - permanent magnet, 550 - magnetorheological fluid, 560 - electromagnetic coil, 570 - inner wall, 571 - elastic membrane, 580 - outer wall, 581 - fourth air hole, 582 - fifth air hole, 590 - internal space, 600 - rotating cylinder base, 711 - first air rod, 712 - first valve, 721 - second air rod, 722 - second valve, 731 - third air rod, 732 - third valve, 742 - fourth valve, 752 - fifth valve, 800 - liquid level detection unit, 900 - speed measurement unit, 1000 - drive unit. Detailed implementation manners

[0100] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. Generally, the components of the embodiments of the present application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0101] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0102] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0103] In the description of the present application, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. In addition, in the description of the present application, if terms such as "first", "second", etc. are used only for distinguishing descriptions, they should not be construed as indicating or implying relative importance.

[0104] In addition, in the description of the present application, if terms such as "horizontal" and "vertical" are used, it does not mean that the components are required to be absolutely horizontal or hanging vertically, but they can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and it does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0105] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected to" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0106] As Figure 1 shown, in the first embodiment of the present application, a non-Newtonian fluid viscosity detection device 100 includes: a first container 111, a partition 120, a first rotating cylinder 300, and a rotating shaft 400, wherein,

[0107] The first container 111 is a hollow container, which can be cylindrical as a whole, and its internal cavity is used to hold the liquid to be measured; for the convenience of installing each component inside the first container 111, exemplarily, the top of the first container 111 is open, the partition 120 is fixedly installed on the top of the first container 111, and the partition 120 closes the top of the first partition; the first rotating cylinder 300 is arranged inside the first container 111, and the top of the first rotating cylinder 300 is fixedly connected to the rotating shaft 400; the rotating shaft 400 passes through the partition 120 and is rotatably connected to the partition 120;

[0108] The top of the rotating shaft 400 is connected to a speed measuring unit 900, wherein the speed measuring unit 900 is used to measure the rotation speed of the rotating shaft 400; when the detection device 100 is running, parameters such as the attenuation speed of the rotation speed of the first rotating cylinder 300 are measured by the speed measuring unit 900, and the viscosity of the liquid to be measured can be calculated.

[0109] As shown Figure 1 In an embodiment of the present application, the first container 111 is connected to the transmission channel of the liquid to be measured. The liquid to be measured can flow through the first container 111 from the transmission channel and then flow back to the transmission channel. During detection, the liquid to be measured keeps flowing and is not stationary, so as to complete the on-line viscosity detection.

[0110] Specifically, the side wall of the first container 111 has an inlet 113 and an outlet 114 near the bottom; wherein, the inlet 113 is connected to the input channel of the liquid to be measured for introducing the liquid to be measured into the first container 111; the outlet 114 is connected to the discharge channel of the liquid to be measured for discharging the liquid to be measured from the first container 111; a fourth valve 742 is provided on the input channel to control the on-off of the inlet 113, and a fifth valve 752 is provided on the discharge channel to control the on-off of the outlet 114. During the process of detecting the viscosity, both the fourth valve 742 and the fifth valve 752 are kept open, and the liquid to be measured continuously flows into the first container 111 from the inlet 113 and then flows out from the outlet 114.

[0111] In an embodiment of the present application, the inlet 113 and the outlet 114 are respectively located on two opposite sides of the first container 111, and the vertical height of the inlet 113 is lower than that of the outlet 114. By adopting the way of entering from the bottom and flowing out from the top, it can ensure that the height of the liquid level 115 in the first container 111 is always higher than the inlet 113, thereby avoiding the influence of gas mixing during liquid inlet on the detection accuracy.

[0112] In an embodiment of the present application, the bottom of the first container 111 has a groove 1100. The solid-phase impurities in the liquid to be measured can enter the groove 1100 under the action of the centrifugal force when the first rotating cylinder 300 rotates, thereby avoiding the impurities getting stuck in the gap or other positions between the first container 111 and the first rotating cylinder 300 and causing inaccurate detection results.

[0113] In the present application, the partition plate 120 is located at the top of the first container 111 and closes the open mouth of the first container 111, which can play a role in blocking corrosive steam and dust. The middle part of the partition plate 120 has a through hole, and the rotating shaft 400 can pass through the through hole; it can be understood that the partition plate 120 can be two parts of an integral structure with the first container 111, or can be detachably connected to the first container 111.

[0114] The first rotating cylinder 300 is spindle-shaped and hollow inside. The outer diameter of the first rotating cylinder 300 is smaller than the inner diameter of the first container 111, so as to form an annular measurement gap between the first rotating cylinder 300 and the first container 111 to accommodate the liquid to be measured. The detection device 100 of this embodiment is of a single-cylinder structure, that is, only the first rotating cylinder 300 in the detection device 100 participates in the viscosity detection, and there is no other rotating cylinder. During detection, the first rotating cylinder 300 rotates at a preset speed and drives the surrounding liquid to be measured to rotate. The liquid to be measured satisfies the Taylor-Couette steady flow in the measurement gap without complex flows such as turbulence, Taylor vortices, and secondary flows; the viscosity of the liquid to be measured can be calculated by measuring parameters such as the attenuation speed of the rotation speed of the first rotating cylinder 300. It can be understood that the immersion depth of the first rotating cylinder 300 during detection is within the preset immersion depth range. As an alternative implementation, when the liquid to be measured is within the normal pressure range, the normal height range of the liquid level inside the first container 111 can be obtained by calculation or experiment, and then when designing and / or installing the rotating shaft 400 and the first rotating cylinder 300, the heights of the rotating shaft 400 and the first rotating cylinder 300 can be adjusted so that when the liquid level is within the normal height range, the immersion depth of the first rotating cylinder 300 meets the preset immersion depth range.

[0115] In an embodiment of the present application, the detection device 100 further includes an air duct 410. The air duct 410 communicates the inside and outside of the first container 111, and one end thereof is connected to a first external air source. The first external air source outputs a first positive-pressure gas. The air duct 410 serves as a transmission channel for the first positive-pressure gas and can input the first positive-pressure gas into the first container 111, so as to form a positive-pressure environment above the liquid to be measured in the first container 111 and maintain the pressure on the liquid to be measured.

[0116] Exemplarily, as Figure 1 shown, the detection device 100 includes a transfer pipe 401. The air duct 410 is located inside the transfer pipe 401 and extends along the axial direction of the transfer pipe 401. The transfer pipe 401 passes through the partition 120 and is inserted into the first container 111, and the intersection of the transfer pipe 401 and the partition 120 is sealed.

[0117] As Figure 2 shown, in an embodiment of the present application, as another alternative implementation of the air duct 410, the air duct 410 is located inside the rotating shaft 400 and extends along the axial direction. Specifically:

[0118] The air duct 410 extends from the top of the rotating shaft 400 into the interior of the rotating shaft 400. A first air hole 420 is provided on the rotating shaft 400 inside the first container 111, and the first air hole 420 communicates the air duct 410 with the interior space of the first container 111. Since the first rotating cylinder 300 is coaxially connected to the end of the rotating shaft 400, the air duct 410 being located inside the rotating shaft 400 can make the release position of the first positive-pressure gas closer to the axis of the first rotating cylinder 300, making it easier to control the liquid level height around the first rotating cylinder 300. At the same time, without the need to additionally introduce a transfer pipe 401, there is no need to set additional sealing measures for the connection between the transfer pipe 401 and the first container 111.

[0119] It can be understood that the first air hole 420 may include a plurality of air holes, which are evenly distributed along the circumferential direction of the rotating shaft 400 respectively, so as to ensure that the first positive-pressure gas can still leave the air duct 410 evenly during the rotation process and reduce the disturbance to the rotating shaft 400. Exemplarily, the first air hole 420 includes six air holes, which is convenient for processing while ensuring the uniformity of gas inlet and outlet.

[0120] In the above embodiments, the height of the liquid level 115 of the liquid to be measured in the first container 111 can be adjusted passively and / or actively by introducing the first positive-pressure gas into the first container 111. It can be understood that when the input pressure of the liquid to be measured increases and the height of the liquid level 115 increases, the space above the interior of the first container 111 decreases and compresses the first positive-pressure gas, resulting in an increase in the pressure of the first positive-pressure gas on the liquid to be measured, thereby at least partially offsetting the increase in the input pressure of the liquid to be measured and inhibiting the continuous increase in the height of the liquid level 115; when the input pressure of the liquid to be measured decreases and the height of the liquid level 115 decreases, the space above the interior of the first container 111 increases and expands the first positive-pressure gas, resulting in a decrease in the pressure of the first positive-pressure gas on the liquid to be measured, thereby at least partially offsetting the decrease in the input pressure of the liquid to be measured and inhibiting the continuous decrease in the height of the liquid level 115, realizing the function of pneumatically compensating the liquid level height. In this way, the fluctuation of the height of the liquid level 115 can be passively reduced, ensuring that the immersion depth of the first rotating cylinder 300 meets the requirements of viscosity detection. In addition, the pressure of the input first positive-pressure gas can also be changed to actively adjust the height of the liquid level 115. As an optional method, when the height of the liquid level 115 is within the preset range that meets the requirements of viscosity detection, the pressure of the input first positive-pressure gas is not changed, and the fluctuation of the height of the liquid level 115 is passively reduced by the first positive-pressure gas. When the height of the liquid level 115 exceeds the preset range, the pressure of the input first positive-pressure gas is changed to actively adjust the height of the liquid level 115.

[0121] In the above embodiments, the method of introducing the first positive-pressure gas is adopted instead of a mechanical motion device to adjust the height of the liquid level 115 of the liquid to be measured, and the immersion depth of the first rotating cylinder 300 is changed. A mechanical motion device is likely to be damaged and is cumbersome to maintain when continuously operating for a long time in the harsh environment of a drilling site, while the present application does not have the above problems. The first positive-pressure gas can, to a certain extent, prevent substances such as corrosive steam and dust from passing upward through the through-holes of the partition plate 120 and damaging other components. In addition, the flow path of the first positive-pressure gas in the detection device forms a cooling gas path, which can take away heat during the flow process to avoid malfunctions of the detection device 100 caused by high temperatures at the drilling site.

[0122] The detection device 100 of this embodiment can be used as an independent device, and the liquid to be measured at the drilling site is introduced into the detection device 100 through the input channel for automatic detection without the need for manual collection of samples of the liquid to be measured. In addition, the detection device 100 can select the position of the detection device 100 according to the characteristics of the on-site environment, and then correspondingly design the input pipeline and the discharge channel of the connection main line, thereby improving the applicability of the detection device 100.

[0123] In an embodiment of the present application, as Figure 3 shown, the non-Newtonian fluid viscosity detection device 100 further includes a baffle 430. The baffle 430 is arranged on the rotating shaft 400 in the first container 111 and is located 5 mm - 10 mm above the first air hole 420. The diameter of the baffle 430 is smaller than the inner diameter of the first container 111. Without changing the pressure and flow rate of the input first positive-pressure gas, the baffle 430 can limit the upward movement speed of the first positive-pressure gas, gather more of the first positive-pressure gas between the baffle 430 and the liquid level 115, and increase the air pressure here, thereby improving the adjustment efficiency.

[0124] In an embodiment of the present application, as Figure 4 shown, the detection device 100 further includes a bearing seat 500. The bearing seat 500 is a housing and is located on the side of the partition plate 120 away from the liquid to be measured. The rotating shaft 400 has a mating section 440, and the mating section 440 is installed in the bearing seat 500 to limit the range of axial movement of the rotating shaft 400, and the rotating shaft 400 can rotate relative to the bearing seat 500 and the partition plate 120.

[0125] In an embodiment of the present application, to facilitate the entry of the first positive-pressure gas into the air passage 410 inside the rotating shaft 400, a second air hole 450 is further provided at the mating section 440 of the rotating shaft 400. Correspondingly, a first air rod 711 is inserted into the bearing seat 500. The first air rod 711 connects the first external air source and the internal space of the bearing seat 500, and a first valve 712 is provided on the first air rod 711 to control the on / off of the first air rod 711. After the first valve 712 is opened, the first positive-pressure gas can enter the bearing seat 500 through the first air rod 711 and then enter the air passage 410 through the second air hole 450. It can be understood that the second air hole 450 may include multiple air holes, which are evenly distributed along the circumferential direction of the rotating shaft 400 respectively, so as to ensure that the first positive-pressure gas can still enter the air passage 410 evenly during the rotation process. Exemplarily, the second air hole 450 includes six air holes arranged towards the axis of the bearing 400, which is convenient for processing while ensuring the uniformity of gas inlet and outlet.

[0126] In an embodiment of the present application, the bearing seat 500 includes a seat body 510 and a third air hole 530. The seat body 510 is a cylindrical shell, fixed on the side of the partition 120 away from the liquid to be measured, and has an accommodation space 520 inside to assemble the mating section 440 of the rotating shaft 400. The third air hole 530 penetrates the seat body 510, and the first air rod 711 is inserted into the third air hole 530, so that the first external air source is communicated with the accommodation space 520.

[0127] In an embodiment of the present application, as Figure 4 shown, at least one float 460 is fixedly connected to the mating section 440. The float 460 is hollow inside and communicated with the second air hole 450. The bottom of the float 460 is provided with an opening, and the air flow input from the first air rod 711 can only enter through the bottom of the float 460, and then enter the rotating shaft 400 through the second air hole 450. Thus, the mating section 440 is suspended up and down in the accommodation space 520 by the thrust of the rising air flow, so as to reduce the frictional resistance suffered by the rotating shaft 400 during rotation. Exemplarily, the number of floats 460 is six, which are circumferentially and evenly fixed on the side wall of the mating section 440 to prevent the mating section 440 from tilting during suspension. In this embodiment, the air passage 410 inside the rotating shaft 400 can reduce the weight of the rotating shaft 400, which is beneficial to the suspension of the mating section 440 of the rotating shaft 400.

[0128] In an embodiment of the present application, when no first positive-pressure gas is introduced into the accommodation space 520, the float 460 falls on the bottom surface of the seat body 510 under the influence of its own gravity and the gravity of the rotating shaft 400; when the first positive-pressure gas is introduced, as Figure 4As shown, the first positive-pressure gas flows into the gap between at least one float 460 and the bottom surface of the seat body 510, and a gas pressure film is formed in the gap to lift at least one float 460, so that the mating section 440 is suspended in the accommodation space 520. Exemplarily, the float 460 is a hollow cylinder structure, coaxially and fixedly installed on the rotating shaft 400, and the fixing method can be common methods such as welding, riveting, threading, bonding, etc. The top and bottom skins of the float 460 can increase the surface force-bearing area, enabling the float 460 to be suspended when the first positive-pressure gas is introduced. One side of the float 460 facing the rotating shaft 400 is hollowed out for air conduction, facilitating the excess first positive-pressure gas to enter the rotating shaft 400 through the second air hole 450. Exemplarily, in this embodiment, the output air pressure of the first external air source is 0.3 - 0.5 MPa, and the air ventilation volume is 1.1 - 5.5 L / min. In addition, in this embodiment, the first positive-pressure gas forms a positive-pressure environment in the accommodation space 520, which can prevent substances such as corrosive steam and dust from entering the accommodation space 520 through the gaps, thus realizing the function of pneumatic sealing and protecting the bearing seat 500.

[0129] In an embodiment of the present application, as Figure 5 shown, the bearing seat 500 further includes a permanent magnet 540 and a ferrofluid 550. The permanent magnet 540 is fixed on the seat body 510, and specifically can be arranged at the bottom of the side wall of the seat body 510. The number of the permanent magnets 540 can be multiple, and the multiple permanent magnets 540 are evenly distributed along the circumferential direction. Exemplarily, the permanent magnet 540 can also be an annular permanent magnet 540 surrounding the side wall of the seat body 510, so as to ensure that there is a circumferentially uniform magnetic field in the accommodation space 520. The ferrofluid 550 is arranged in the accommodation space 520 and gathers at the bottom of the accommodation space 520 under the constraint of the magnetic field of the permanent magnet 540, so as to fill the gap between at least one float 460 and the bottom surface of the seat body 510, and suspend the float 460 and the mating section 440 in the accommodation space 520. The ferrofluid 550 can also prevent substances such as corrosive steam and dust from entering through the gap between the rotating shaft 400 and the bearing seat 500, thus protecting the structural components in the accommodation space 520. On the other hand, to prevent the ferrofluid from entering the float 460, the bottom of the float 460 is not perforated, but the side of the float 460 is perforated. Since it is not necessary to rely on the first positive-pressure gas to lift the float 460, the air pressure and air ventilation volume of the first positive-pressure gas are relatively smaller than those in the previous embodiment. Specifically, in this embodiment, the output air pressure of the first external air source is 0.15 - 0.25 MPa, and the air ventilation volume is 0.5 - 2.5 L / min.

[0130] In an embodiment of the present application, as Figure 6As shown, at least one float 460 is made of a conductive material, and the bearing housing 500 further includes an electromagnetic coil 560. The electromagnetic coil 560 is annular and is arranged on the seat body 510, and can generate an induced magnetic field after being energized. It can be understood that the annular electromagnetic coil 560 is arranged to avoid the third air hole 530 to prevent affecting the input of the first positive-pressure gas. The detection device 100 in this embodiment can quickly stop the rotation of the first rotating cylinder 300 after the detection. The control process is as follows: After the detection is completed, the electromagnetic coil 560 is energized to generate a magnetic field in the accommodation space 520. The float 460 rotates with the rotating shaft 400 in the induced magnetic field and cuts the magnetic induction lines, thereby generating eddy currents inside the float 460. The eddy currents form another induced magnetic field and generate an interaction force with the induced magnetic field of the electromagnetic coil 560. This force is opposite to the rotation direction of the float 460, so that the float 460 quickly decelerates until it stops. When the float 460 stops rotating, the power supply to the electromagnetic coil 560 can be disconnected.

[0131] In an embodiment of the present application, as Figure 7 shown, the seat body 510 of the bearing housing 500 is a hollow structure. Specifically, the seat body 510 includes an inner shell 570 and an outer shell 580. The inner shell 570 encloses an accommodation space 520. The outer shell 580 encloses the inner shell 570 and has a gap with the inner shell 570, thereby forming a hollow inner space 590 between the outer shell 580 and the inner shell 570. It can be understood that the permanent magnet 540 and the electromagnetic coil 560 in the foregoing embodiment can also be arranged in the inner space 590, which plays a role in saving space and protecting the permanent magnet 540 and the electromagnetic coil 560. At least one elastic membrane 571 is embedded on the inner shell 570. The outer shell 580 has a through fourth air hole 581, and a second air rod 721 is inserted into the fourth air hole 581, so that the second external air source is connected to the inner space 590. A second valve 722 is provided on the second air rod 721 to control the on / off of the second air rod 721. The second external air source is used to provide a second positive-pressure gas, and the pressure of the second positive-pressure gas is greater than that of the first positive-pressure gas. When the viscosity detection at a certain rotation speed is completed, the second valve 722 is opened, and the second external air source inputs the second positive-pressure gas into the inner space 590 through the second air rod 721. Since the pressure of the second positive-pressure gas is greater than that of the first positive-pressure gas, as Figure 8 shown, the pressure difference on both sides of the elastic membrane 571 causes the elastic membrane 571 to expand inward until it squeezes the float 460. The float 460 is subjected to the friction of the elastic membrane 571 and drives the rotating shaft 400 and the first rotating cylinder 300 to quickly decelerate until they stop, thereby completing the braking and preparing for the next detection work. Exemplarily, as Figure 9 shown, the elastic membrane 571 is made of a rubber material, and the number thereof is three, which are evenly distributed circumferentially on the inner shell 570. During braking, the three elastic membranes 571 simultaneously squeeze the float 460. The float 460 is evenly stressed in the circumferential direction, thereby avoiding shaking during the deceleration process.

[0132] In one embodiment of the present application, the housing 580 has a through fifth air hole 582. A third air rod 731 is inserted into the fifth air hole 582 as a discharge channel for the second positive-pressure gas. A third valve 732 is provided on the third air rod 731 to control the on-off of the third air rod 731. During deceleration, the second valve 722 is opened and the third valve 732 is closed, so that the second positive-pressure gas can accumulate in the internal space 590 and cause the elastic diaphragm 571 to expand; after the float 460 decelerates and stops, the second valve 722 is closed and the third valve 732 is opened, and the second positive-pressure gas in the internal space 590 is discharged through the third air rod 731, and the elastic membrane 571 returns to the state before expansion to prepare for the next braking.

[0133] In one embodiment of the present application, as Figure 10 shown, the detection device 100 further includes a turntable seat 600 and a second turntable 200. The turntable seat 600 is fixed on the partition plate 120 and is used for installing and fixing the second turntable 200. The bearing seat 500 is fixed in the turntable seat 600. The second turntable 200 is a hollow cylinder, located in the first container 111 and coaxially arranged outside the first turntable 300, and the second turntable 200 is rotatably connected to the turntable seat 600. Specifically, the second turntable 200 and the turntable seat 600 are respectively located on both sides of the partition plate 120, and the second turntable 200 passes through the partition plate 120 and is connected to the turntable seat 600; it should be noted that in the previous embodiment, only a through hole for passing through the rotating shaft 400 needs to be opened on the partition plate 120, while in this embodiment, a through hole for passing through the second turntable 200 needs to be opened on the partition plate 120. The outer diameter of the first turntable 300 is smaller than the inner diameter of the second turntable 200, so as to form an annular measurement gap between the first turntable 300 and the second turntable 200 to accommodate the liquid to be measured. The second turntable 200 has an opening 210, and the opening 210 can be located at the bottom end of the second turntable 200 or on the side wall of the second turntable 200. The opening 210 is located below the liquid level 115 during detection, and the liquid to be measured can enter the measurement gap. During detection, the second turntable 200 rotates at a preset speed and drives the surrounding liquid to be measured to rotate. The liquid to be measured satisfies Taylor-Couette steady flow in the measurement gap without complex flows such as turbulence, Taylor vortices, and secondary flows; the first turntable 300 also starts to rotate under the drive of the liquid to be measured until a stable speed, and the viscosity of the liquid to be measured can be calculated by measuring parameters such as the stable speed of the first turntable 300 and the time taken to reach the stable speed.

[0134] In one embodiment of the present application, in this embodiment, the diameter of the baffle 430 is smaller than the inner diameter of the second rotating cylinder 200. A plurality of pressure relief holes 220 communicating the inside and outside of the second rotating cylinder 200 are provided above the baffle 430 on the second rotating cylinder 200. The pressure relief holes 220 are located above the liquid level 115 during detection. When adjusting the height of the liquid level 115, the first positive pressure gas can pass through the gap between the baffle 430 and the second rotating cylinder 200 and then be discharged from the pressure relief holes 220 on the second rotating cylinder 200. In addition, the pressure relief holes 220 can also facilitate the cleaning of the first rotating cylinder 300. When the detection device 100 needs to be cleaned and maintained, the cleaning agent can be sprayed into the measurement gap between the second rotating cylinder 200 and the first rotating cylinder 300 through the pressure relief holes 220 for cleaning.

[0135] Exemplarily, the number of the pressure relief holes 220 is six, which are evenly distributed along the circumferential direction of the second rotating cylinder 200. The pressure relief holes 220 are located at the 2 / 3 height of the second rotating cylinder 200 and have a diameter of 0.5 mm - 1.5 mm, so as to balance the air pressure requirements below and above the baffle 430. The diameter range of the pressure relief holes 220 in this embodiment can avoid excessive gas flow rate during discharge, resulting in insufficient air pressure below the baffle 430; and can also avoid too little gas flow rate during discharge, resulting in excessive air pressure above the baffle 430 and damaging the detection device 100.

[0136] In one embodiment of the present application, to further protect detection components such as the rotating cylinder base 600, as Figure 11 shown, the detection device 100 may further include a second container 112. The second container 112 is a hollow cylindrical container with an open bottom. A partition 120 is located at the open bottom of the second container 112 to enclose the inside of the second container 112. The rotating cylinder base 600 is located in the cavity inside the second container 112. The second container 112 and the partition 120 may be two parts of an integral structure, or may be detachably connected to each other. Exemplarily, the partition 120 is detachably connected to the second container 112 to facilitate the assembly and maintenance of detection components such as the rotating cylinder base 600 and the bearing seat 500 inside it. The partition 120 is detachably connected to the first container 111 to facilitate the disassembly and cleaning of the first rotating cylinder 300 and / or the second rotating cylinder 200.

[0137] The second container 112 is an airtight container. The first positive pressure gas can enter the second container 112 through the gaps of components such as the bearing seat 500 to maintain a positive pressure environment in the second container 112, thereby preventing corrosive steam, dust and other substances from entering the second container 112 through positions such as the gap between the partition 120 and the second container 112 and the through hole in the middle of the partition 120, and realizing the function of pneumatic sealing.

[0138] In this embodiment, one end of the first air rod 711 is used to connect to the first external air source, and the other end sequentially passes through the second container 112 and the rotary drum base 600 and then connects to the third air hole 530; one end of the second air rod 721 is used to connect to the second external air source, and the other end sequentially passes through the second container 112 and the rotary drum base 600 and then connects to the fourth air hole 581; the third air rod 731 passes through the second container 112 and the rotary drum base 600 from the outside of the second container 112 and then connects to the fifth air hole 582, serving as the discharge channel for the second positive pressure gas.

[0139] In an embodiment of the present application, the detection device 100 further includes a liquid level detection unit 800.

[0140] The liquid level detection unit 800 is connected to the side wall of the first container 111 and includes a certain number of liquid level sensors for detecting the height of the liquid surface 115 in the first container 111. It can be understood that to ensure the accuracy of the viscosity measurement result, the first rotary drum 300 has a preset immersion depth range. The liquid level height position when the first rotary drum 300 is at the maximum immersion depth is the highest liquid level height, and the liquid level height position when the first rotary drum 300 is at the minimum immersion depth is the lowest liquid level height. Preferably, the liquid level detection unit 800 is at least used to detect whether the liquid level height in the first container 111 is the preset highest liquid level height and the lowest liquid level height. As an alternative implementation, the liquid level detection unit 800 includes two liquid level sensors, and the two liquid level sensors respectively detect the preset highest liquid level height and the lowest liquid level height. As an alternative implementation, in this embodiment, the ratio of the preset immersion depth range of the first rotary drum 300 to the stator height is 3 - 5. As an alternative implementation, the heights of the liquid inlet and the liquid outlet are both lower than the lowest liquid level height to prevent the first positive pressure gas from escaping through the liquid inlet and / or the liquid outlet when controlling the liquid level height, affecting the control effect.

[0141] In an embodiment of the present application, the detection device 100 further includes a driving unit 1000. The driving unit 1000 is fixed in the second container 112 and connected to the rotary drum base 600 for driving the second rotary drum 200 to rotate at a preset speed. The driving unit 1000 includes a motor with a rotational accuracy less than or equal to 1 degree. It can be understood that the driving unit 1000 can be arranged on the inner wall of the second container 112 or on the partition 120.

[0142] In an embodiment of the present application, the speed measurement unit 900 is fixed in the second container 112 and connected to the rotating shaft 400, and obtains the rotation speed of the first rotary drum 300 by detecting the rotation speed of the rotating shaft 400. The speed measurement unit 900 includes one or more of a magnetoelectric speed sensor, a magnetic sensitive speed sensor, a Hall sensor, an optoelectronic speed sensor, and a speed measurement gyroscope. It can be understood that the speed measurement unit 900 can be arranged on the inner wall of the second container 112 or on the partition 120.

[0143] In one embodiment of the present application, the detection device 100 further includes a control unit, which is connected to the liquid level detection unit 800, the driving unit 1000, the speed measurement unit 900, the first external gas source, the second external gas source, the first valve 712, the second valve 722, the third valve 732, the fourth valve 742, and the fifth valve 752, and is used to control the above components to realize the automation of the detection process. Specifically, the control unit is used to execute the following control instructions:

[0144] Control the opening and closing of the fourth valve 742 and the fifth valve 752; when the fourth valve 742 and the fifth valve 752 are opened, the liquid to be measured enters the first container 111 from the liquid inlet 113. If there is residual liquid to be measured in the first container 111 before the two valves are opened, the new liquid to be measured can wash away the old residual liquid to be measured.

[0145] Control the opening and closing of the first external gas source and the first valve 712; when the first external gas source and the first valve 712 are opened, the height of the liquid surface 115 can be controlled to be fixed by adjusting the pressure of the first positive pressure gas. Controlling the height of the liquid surface 115 to be fixed specifically means: controlling the height fluctuation range of the liquid surface 115 within a preset range, where the preset range can be determined according to the height of the first rotating cylinder 300 and the baffle 430 and / or the length of the second rotating cylinder 200, and / or the preset range is determined according to the preset measurement value of the liquid level detection unit 800. Exemplarily, when the liquid surface 115 reaches the preset range, the liquid surface 115 is located between the baffle 430 and the first rotating cylinder 300, that is, the liquid surface range is: the maximum height is equal to the height of the baffle 430, and the minimum height is equal to the height of the top of the first rotating cylinder 300. In addition, it can be understood that when the height of the liquid surface 115 detected by the liquid level detection unit 800 decreases to the lowest liquid level height, the pressure of the first positive pressure gas is reduced to prevent the liquid level from decreasing or to raise the liquid level; when the height of the liquid surface 115 detected by the liquid level detection unit 800 increases to the highest liquid level height, the pressure of the first positive pressure gas is increased to prevent the liquid level from increasing or to lower the liquid level.

[0146] Control the start and stop of the driving unit 1000. When the driving unit 1000 is controlled to start, the second rotating cylinder 200 or the first rotating cylinder 300 is driven to rotate at a preset speed. When the second rotating cylinder 200 is rotated, the speed measurement unit 900 is controlled to detect the rotation speed of the first rotating cylinder 300, and the rotation speed of the first rotating cylinder 300 after stabilization and the time taken to reach the stable rotation speed are obtained; when the first rotating cylinder 300 is rotated, the speed measurement unit 900 is controlled to detect the rotation speed of the first rotating cylinder 300, and when the rotation speed reaches the preset value, the driving unit 1000 is stopped, and the rotation speed decay information of the first rotating cylinder 300 is obtained. Exemplarily, the viscosity of the liquid to be measured is calculated according to the preset rotation speed, the stable rotation speed of the first rotating cylinder 300, and the time taken to reach the stable rotation speed, and is calculated according to the following formula:

[0147]

[0148] where η is the apparent viscosity of the liquid to be measured at the stable rotational speed; R i is the outer diameter of the first rotating cylinder 300; R a is the inner diameter of the second rotating cylinder 200; L is the height of the first rotating cylinder 300; ω out is the preset rotational speed; J is the moment of inertia of the first rotating cylinder 300; ω const is the stable rotational speed of the first rotating cylinder 300; t is the time elapsed for the first rotating cylinder 300 to reach the stable rotational speed.

[0149] Control the start and stop of the second external air source and the second valve 722. After the drive unit 1000 is turned off, turn on the second external air source and the second valve 722 to introduce the second positive-pressure gas into the internal space 590 to quickly stop the rotation of the first rotating cylinder 300. After detecting that the first rotating cylinder 300 has stopped rotating, turn off the second external air source and the second valve 722, and turn on the third valve 732 to release the second positive-pressure gas. After the release is completed, turn off the third valve 732.

[0150] Control the start and stop of the electromagnetic coil 560. When the detection device 100 includes the electromagnetic coil 560 and the float includes a conductive material, after the drive unit 1000 is turned off, control the electromagnetic coil 560 to be energized to quickly stop the rotation of the first rotating cylinder 300. After detecting that the first rotating cylinder 300 has stopped rotating, control the electromagnetic coil 560 to be de-energized.

[0151] Since the viscosity of non-Newtonian fluid varies with different speeds, therefore, a complete detection process needs to measure the viscosity of the liquid to be measured at different rotational speeds. The detection process needs to be repeated multiple times to obtain the viscosity of the liquid to be measured at different preset rotational speeds.

[0152] According to the non-Newtonian fluid viscosity detection device described above, in an embodiment of the present application, a non-Newtonian fluid viscosity detection method is provided. The method includes:

[0153] Connect the first container 111 to an external liquid transmission channel to be measured, so that the liquid to be measured continuously flows through the first container 111 and submerges the first rotating cylinder 300;

[0154] Introduce the first positive-pressure gas above the liquid to be measured in the first container 111 to adjust the first rotating cylinder 300 to the preset immersion depth;

[0155] Drive the first rotating cylinder 300 or the second rotating cylinder 200 to rotate and obtain measurement data;

[0156] Calculate the viscosity of the liquid to be measured according to the measurement data.

[0157] Among them, the measurement data includes, but is not limited to, the rotation speed of the first rotating cylinder 300.

[0158] In this embodiment, a first positive pressure gas is introduced into the first container 111 above the liquid to be measured through the air duct 410. It can be understood that when the detection device 100 only has the first rotating cylinder 300 and no second rotating cylinder 200, the first rotating cylinder 300 is rotated at a preset rotation speed under the condition of a preset immersion depth, and the viscosity of the liquid to be measured can be calculated by measuring parameters such as the attenuation speed of the rotation speed of the first rotating cylinder 300; when the detection device 100 has both the first rotating cylinder 300 and the second rotating cylinder 200, the second rotating cylinder 200 is rotated at a preset rotation speed under the condition of a preset immersion depth, and the first rotating cylinder 300 is driven to rotate by the liquid to be measured. By measuring the rotation speed or torque of the first rotating cylinder 300, etc., the viscosity of the liquid to be measured can be calculated. There are existing technologies for both single-cylinder and double-cylinder viscosity measurement methods, so they will not be elaborated here.

[0159] Exemplarily, when the second rotating cylinder 200 is rotated, the speed measurement unit 900 is controlled to detect the rotation speed of the first rotating cylinder 300, and the rotation speed of the first rotating cylinder 300 after stabilization and the time taken to reach the stable rotation speed are obtained;

[0160] The viscosity of the liquid to be measured is calculated according to the preset rotation speed, the stable rotation speed of the first rotating cylinder 300, and the time taken to reach the stable rotation speed, and is calculated according to the following formula:

[0161]

[0162] Among them, η is the apparent viscosity of the liquid to be measured at this stable rotation speed; R i is the outer diameter of the first rotating cylinder 300; R a is the inner diameter of the second rotating cylinder 200; L is the height of the first rotating cylinder 300; ω out is the preset rotation speed; J is the moment of inertia of the first rotating cylinder 300; ω const is the stable rotation speed of the first rotating cylinder 300; t is the time elapsed for the first rotating cylinder 300 to reach the stable rotation speed.

[0163] Finally, it should be noted that the first container 111 can also have an open bottom and a sealing cover is installed at the bottom. At this time, only a hole that can accommodate the rotating shaft 400 needs to be opened at the top of the first container 111, and the components connected to the partition 120 in the above text can be directly installed on the upper wall of the first container 111.

[0164] It should be noted that in this document, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or system comprising a series of elements not only includes those elements but also other elements not expressly listed, or elements inherent to such process, method, article or system. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or system comprising such element.

[0165] The serial numbers of the embodiments of the present application above are for description only and do not represent the superiority or inferiority of the embodiments.

[0166] The above are only the preferred embodiments of the present application and do not limit the patent scope of the present application accordingly. Any equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, are equally included in the patent protection scope of the present application.

Claims

1. A non-Newtonian fluid viscosity detection device, the detection device (100) comprising: A first container (111) for containing the liquid to be measured and communicating with an external transmission channel for the liquid to be measured; A rotating shaft (400) rotatably installed, with one end extending into the first container (111); A first rotating cylinder (300) located inside the first container (111) and fixedly connected to one end of the rotating shaft (400); An air duct (410) communicating the inside and outside of the first container (111) for introducing a first positive pressure gas into the first container (111) to adjust the height of the liquid level (115) of the liquid to be measured; A speed measurement unit (900) connected to the rotating shaft (400) for detecting the rotation speed of the rotating shaft (400).

2. The non-Newtonian fluid viscosity detection device according to claim 1, characterized in that The air duct (410) is located inside the rotating shaft (400) and extends along the axial direction of the rotating shaft (400); The rotating shaft (400) further comprises: A first air hole (420) located on the rotating shaft (400) and communicating the air duct (410) and the first container (111).

3. The non-Newtonian fluid viscosity detection device according to claim 1, characterized in that, The first container (111) includes a liquid inlet (113) and a liquid outlet (114), the liquid inlet (113) and the liquid outlet (114) are used to communicate with an external transmission channel for the liquid to be measured, the liquid inlet (113) and the liquid outlet (114) are respectively located on both sides of the first container (111), and the position of the liquid inlet (113) is lower than the position of the liquid outlet (114).

4. The non-Newtonian fluid viscosity detection device according to claim 2, wherein The detection device (100) further comprises: A baffle (430) disposed above the first air hole (420) inside the first container (111); The baffle (430) is installed on the side wall of the rotating shaft (400) or the first container (111).

5. The non-Newtonian fluid viscosity detection device according to claim 2, wherein, The top of the rotating shaft (400) is sealed; The rotating shaft (400) further comprises: A second air hole (450) located on the rotating shaft (400) and communicating the air duct (410) and the external space of the rotating shaft (400).

6. The non-Newtonian fluid viscosity detection device according to claim 5, characterized in that, The detection device (100) further comprises a bearing seat (500), the bearing seat (500) includes a seat body (510), an accommodation space (520) is provided inside the seat body (510), the seat body (510) is located outside the first container (111), the seat body (510) is installed on the upper wall of the first container (111), and a third air hole (530) communicating the inside and outside spaces is provided on the side surface of the seat body (510); The rotating shaft (400) further comprises a mating section (440), the mating section (440) is located inside the accommodation space (520); The second air hole (450) is located at the mating section (440).

7. The non-Newtonian fluid viscosity detection device according to claim 6, characterized in that, At least one float (460) is fixedly installed on the rotating shaft (400) corresponding to the mating section (400), the float (460) is hollow inside and has an open bottom, and the internal space of the float (460) communicates with the second air hole (450).

8. The non-Newtonian fluid viscosity detection device according to claim 6, wherein, At least one float (460) is fixedly installed on the rotating shaft (400) corresponding to the mating section (400). The bearing housing (500) further includes a permanent magnet (540) fixed on the housing body (510) and a magnetorheological fluid (550) disposed in the accommodation space (520). The magnetorheological fluid (550) is constrained by the permanent magnet (540) to fill the gap between the at least one float (460) and the bottom surface of the housing body (510).

9. A non-Newtonian fluid viscosity detection device according to claim 6, wherein At least one of the floats (460) comprises a conductive material; The bearing housing (500) further includes: An electromagnetic coil (560) is circumferentially arranged along the inner wall of the housing body (510) and is used to reduce the rotational speed of the at least one float (460) after being energized.

10. A non-Newtonian fluid viscosity detection device according to claim 6, wherein The housing body (510) further includes: An inner shell (570) encloses the accommodation space (520); An outer shell (580) encloses the inner shell (570), and a hollow internal space (590) is formed between the outer shell (580) and the inner shell (570); A fourth air hole (581) penetrates through the outer shell (580) and is used to connect with a second external gas source to introduce a second positive-pressure gas into the internal space (590), and the pressure of the second positive-pressure gas is greater than that of the first positive-pressure gas; At least one elastic membrane (571) is embedded on the inner shell (570) and is used to expand inwards under the action of the second positive-pressure gas and squeeze at least one of the floats (460).

11. A non-Newtonian fluid viscosity detection device according to claim 10, wherein The housing body (510) further includes: A fifth air hole (582) penetrates through the outer shell (580) and is used to discharge the second positive-pressure gas.

12. A non-Newtonian fluid viscosity detection device according to any one of claims 5-11, wherein The detection device (100) further includes: A turntable base (600) is located outside the first container (111) and is installed on the upper wall of the first container (111), and the bearing housing (500) is located within the turntable base (600); A second turntable (200) is directly or indirectly rotatably connected to the turntable base (600), is located within the first container (111) and is coaxially disposed outside the first turntable (300), and includes an opening (210) and a plurality of pressure relief holes (220); The opening (210) is located below the liquid level (115) during detection; The plurality of pressure relief holes (220) are located above the liquid level (115) during detection.

13. A non-Newtonian fluid viscosity detection device according to claim 12, wherein The detection device (100) further includes: A second container (112) is disposed above the first container (111); The turntable base (600) is located within the second container (112).

14. A non-Newtonian fluid viscosity detection device according to claim 13, characterized in that the detection device (100) further comprises: a first air rod (711), one end of which is used to connect the first external air source, and the other end sequentially passes through the second container (112) and the rotating cylinder base (600) and then connects to the third air hole (530); a first valve (712), arranged on the first air rod (711) and used to control the on-off of the first air rod (711); a second air rod (721), one end of which is used to connect the second external air source, and the other end sequentially passes through the second container (112) and the rotating cylinder base (600) and then connects to the fourth air hole (581); a second valve (722), arranged on the second air rod (721) and used to control the on-off of the second air rod (721); a third air rod (731), sequentially passing through the second container (112) and the rotating cylinder base (600) from the outside of the second container (112) and then connecting to the fifth air hole (582), serving as the discharge channel of the second positive-pressure gas; a third valve (732), arranged on the third air rod (731) and used to control the on-off of the third air rod (731); a fourth valve (742), used to control the on-off of the liquid inlet (113); a fifth valve (752), used to control the on-off of the liquid outlet (114).

15. The non-Newtonian fluid viscosity detection device according to claim 1, characterized in that, The top of the first container (111) is open, and a partition plate (120) is installed on the top of the first container (111), and the partition plate (120) serves as the upper wall of the first container (111).

16. A non-Newtonian fluid viscosity detection device according to claim 1, characterized in that the detection device (100) further comprises: a liquid level detection unit (800), connected to the first container (111) and used to detect the height of the liquid surface (115).

17. A non-Newtonian fluid viscosity detection device according to claim 1, characterized in that the detection device (100) further comprises: a control unit, connected to the liquid level detection unit (800) and used to adjust the pressure of the first positive-pressure gas according to the height of the liquid surface (115).

18. A non-Newtonian fluid viscosity detection device according to claim 1, characterized in that the detection device (100) further comprises: a driving unit (1000), fixed in the second container (112), connected to the rotating cylinder base (600) and used to drive the second rotating cylinder (200) to rotate at a preset speed.

19. A non-Newtonian fluid viscosity detection method, which is used for a non-Newtonian fluid viscosity detection device according to any one of claims 1-11 and claims 15-18; the method comprises: connecting the first container (111) to an external liquid transmission channel to be measured, so that the liquid to be measured continuously flows through the first container (111) and submerges the first rotating cylinder (300); Introduce a first positive pressure gas above the liquid to be measured in the first container (111) to adjust the first rotating cylinder (300) to a preset immersion depth; Drive the first rotating cylinder (300) to rotate to a preset speed and then stop; Measure the decay speed parameter of the rotation speed of the first rotating cylinder (300); Calculate the viscosity of the liquid to be measured according to the decay speed parameter.

20. A method for detecting the viscosity of a non-Newtonian fluid, the method being a device for detecting the viscosity of a non-Newtonian fluid according to any one of claims 12-14 and claims 15-18; The method includes: Connect the first container (111) to an external liquid transmission channel to be measured, so that the liquid to be measured continuously flows through the first container (111) and immerses the first rotating cylinder (300); Introduce a first positive pressure gas above the liquid to be measured in the first container (111) to adjust the first rotating cylinder (300) to a preset immersion depth; Drive the second rotating cylinder (200) to rotate to a preset speed; Measure the rotation speed or torque of the first rotating cylinder (300); Calculate the viscosity of the liquid to be measured according to the rotation speed or torque of the first rotating cylinder (300).

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