Viscosity coefficient measuring device

Abstract

The utility model discloses a viscosity coefficient measuring device which comprises a mounting plate, a measuring assembly is arranged on the mounting plate, and the measuring assembly comprises a graduated scale, a calibration scale and a measuring pipeline. A plurality of fixing nails are arranged on the graduated scale, and the plurality of fixing nails penetrate through the graduated scale at equal intervals and are connected with the mounting plate; the calibration ruler is arranged on the inner side of the graduated scale; the measuring pipeline comprises a drain pipe, a connecting pipe, a glass pipe and a capillary pipe; one end of the drain pipe is in contact with the graduated scale and the calibration scale; the other end of the drain pipe is connected with the connecting pipe, the connecting pipe is connected with the glass pipe, and the capillary pipe is arranged at the end of the glass pipe. According to the device disclosed by the utility model, the fixing nails are arranged at equal intervals, so that the device can adjust the height of the drain pipe, and the measurement result of the viscosity coefficient is verified by changing experimental parameters; and the accuracy of measurement results is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of air viscosity coefficient measurement, in particular to a viscosity coefficient measurement device. Background Art

[0002] Air viscosity is a property of air, a key parameter that characterizes the ability of a free molecular layer to resist shear deformation during collisions, and the magnitude of air viscosity. Its physical meaning is the tangential force required to maintain a unit velocity difference per unit area between two air layers separated by a unit distance. Air viscosity is measured in Pascals (Pas) in the International System of Units (SI) and Poise (poise) in the Common Geometry System (CGS). Air viscosity is crucial for the design and optimization of fluid mechanics and aerodynamic systems. It is widely used in fluid mechanics analysis and design in fields such as aerospace, automotive, aerodynamics, and mechanical engineering.

[0003] In the prior art, for example, the technical solution described in patent publication number CN217156180 is: an acoustic measurement system for measuring air viscosity coefficient, including a signal receiving and transmitting device, a first sound output device, and a first sound input device; the first sound output device is arranged at the bottom of the first closed cavity, and the first sound input device is arranged at the top of the first closed cavity, and the signal output end and signal input end of the signal receiving and transmitting device are electrically connected to the first sound output device and the first sound input device, respectively.

[0004] Common methods for measuring air viscosity include the capillary tube method, the simple pendulum method, and the air track method. The simple pendulum method is difficult to measure the displacement of a ball and ignores friction between the wire and the connecting device. The air track method is expensive and difficult to control device stability. The capillary tube method also has drawbacks such as high operational difficulty and the use of unsafe materials, which has significantly hindered the promotion of experimental teaching for measuring air viscosity. Utility Model Content

[0005] The purpose of the utility model is to provide a device for measuring the viscosity coefficient, so as to solve the problem that in the prior art proposed in the background art, the measuring device used when measuring the viscosity coefficient is relatively complex, resulting in complicated operation during measurement and inconvenience in quickly measuring the viscosity coefficient.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A device for measuring a viscosity coefficient includes a mounting plate on which a measuring component is arranged, and the measuring component is used to measure the viscosity coefficient;

[0008] The measuring assembly includes a scale, a calibration ruler, and a measuring pipe; wherein the scale is fixedly mounted on one side of a mounting plate, and a plurality of fixing nails are provided on the scale, and the fixing nails are provided, and the plurality of fixing nails are evenly spaced and pass through the scale and connected to the mounting plate; the calibration ruler is arranged on the inner side of the scale;

[0009] The measuring pipeline includes a drain pipe, a connecting pipe, a glass tube and a capillary tube; one end of the drain pipe contacts the scale and the calibration ruler respectively; the other end of the drain pipe is connected to the connecting pipe, which is in turn connected to the glass tube, and a capillary tube is set at the end of the glass tube.

[0010] According to the above technical solution, 6 fixing nails are provided, and the interval between adjacent fixing nails is 5 cm.

[0011] According to the above technical solution, support nails are also provided on the mounting plate, and the support nails are used to support the drain pipe.

[0012] According to the above technical solution, two support nails are provided, and the two support nails are respectively provided at the two ends of the hydrophobic pipe.

[0013] According to the above technical solution, the glass tube is fixed to the mounting plate by a cable tie.

[0014] According to the above technical solution, a thermometer is also provided on the mounting plate, and the thermometer is used to measure the ambient temperature.

[0015] According to the above technical solution, the connecting pipe is a rubber tube.

[0016] According to the above technical solution, a sealing device is further provided in the middle of the connecting pipe, and the sealing device is used to seal the connecting pipe.

[0017] According to the above technical solution, the sealing device adopts a spring clip.

[0018] According to the above technical solution, a joint is further provided at the end of the connecting tube, and the joint is used to connect the connecting tube to the hydrophobic tube and the glass tube respectively.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The device of the utility model can adjust the height of the drain pipe by setting the fixing nails at equal intervals, thereby verifying the measurement results of the viscosity coefficient by changing the experimental parameters, thereby improving the accuracy of the measurement results.

[0021] The design of the device in the utility model makes it relatively simple to operate, and the user can conveniently perform measurements and maintenance, and is suitable for laboratory and field operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1This is a schematic diagram of the structure of the measuring device of the utility model;

[0023] Figure 2 This is a schematic diagram of the joint structure of the utility model;

[0024] Figure 3 This is one of the schematic diagrams of the internal structure of the connector of the utility model;

[0025] Figure 4 This is the second schematic diagram of the internal structure of the connector of the utility model;

[0026] Figure 5 This is a schematic diagram of the connector connection of the present invention.

[0027] Markings in the figure: 100-scale, 200-calibration ruler, 300-thermometer, 400-glass tube, 500-capillary tube, 600-cable tie, 700-sealing device, 800-connecting tube, 900-drain tube, 110-mounting plate, 111-fixing nail, 112-support nail, 113-first connecting section, 114-second connecting section, 115-rotating seat, 116-fixing rod, 117-through groove, 118-fixing head, 119-blocking piece. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Example 1

[0030] like Figure 1 As shown, a viscosity coefficient measuring device includes a mounting plate 110, on which a measuring component is provided, and the measuring component is used to measure the viscosity coefficient;

[0031] The measuring assembly includes a scale 100, a calibration ruler 200, and a measuring pipe. The scale 100 is fixedly mounted on one side of a mounting plate 110. A plurality of fixing pins 111 are provided on the scale 100. The fixing pins 111 are evenly spaced and pass through the scale 100 to connect to the mounting plate 110. The calibration ruler 200 is disposed on the inner side of the scale 100.

[0032] The measuring pipeline includes a hydrophobic tube 900, a connecting tube 800, a glass tube 400 and a capillary tube 500; one end of the hydrophobic tube 900 contacts the scale 100 and the calibration scale 200 respectively; the other end of the hydrophobic tube 900 is connected to the connecting tube 800, which is then connected to the glass tube 400, and a capillary tube 500 is set at the end of the glass tube 400.

[0033] Furthermore, one end of the calibration ruler 200 is calibrated as the C end, and the other end of the calibration ruler is calibrated as the D end.

[0034] The device of the present invention can accurately measure the flow characteristics of liquids by using the scale 100 and the calibration ruler 200 in conjunction with each other, thereby obtaining a more accurate viscosity coefficient. The setting of the fixing pin 111 makes it easy to install and fix the measuring assembly, and the user can conveniently conduct experiments.

[0035] Example 2

[0036] This embodiment is a further refinement of the first embodiment.

[0037] There are 6 fixing nails 111, and the interval between adjacent fixing nails 111 is 5 cm.

[0038] Specifically, the fixing nails 111 are numbered from top to bottom, wherein the top fixing nail 111 is No. 1 fixing nail, which is set at 30 cm of the ruler 100; No. 2 fixing nail is set at 25 cm; No. 3 fixing nail is set at 20 cm, No. 4 fixing nail is set at 15 cm; No. 5 fixing nail is set at 10 cm; and No. 6 fixing nail is set at 5 cm.

[0039] Support nails 112 are also provided on the mounting plate 110 , and the support nails 112 are used to support the drain pipe 900 ; two support nails 112 are provided, and the two support nails 112 are respectively provided at both ends of the drain pipe 900 .

[0040] Specifically, the support pins 112 are arranged at 0 cm of the scale 100 and the two support pins 112 are arranged on the same horizontal line.

[0041] The glass tube 400 is fixed to the mounting plate 110 by a cable tie 600 .

[0042] Specifically, the glass tube 400 is disposed below the hydrophobic tube 900 , one end of the capillary tube 500 is disposed at the end of the glass tube 400 , and the other end of the capillary tube 500 extends to the outside of the glass tube 400 .

[0043] A thermometer 300 is also provided on the mounting plate 110 , and is used to measure the ambient temperature.

[0044] Specifically, the thermometer 300 is set at the upper right corner of the mounting plate 110, and the thermometer 300 is fixedly connected to the mounting plate 110. By setting the thermometer 300 to read the ambient temperature, it is convenient for the user to read the ambient temperature data.

[0045] The connecting pipe 800 is a rubber pipe, and a sealing device 700 is provided in the middle of the connecting pipe 800. The sealing device 700 is used to seal the connecting pipe 800. The sealing device 700 is a spring clip.

[0046] Specifically, the spring clip is arranged in the middle of the connecting tube 800. Since the connecting tube 800 is a rubber tube, the rubber tube has a certain elasticity. Therefore, by arranging the spring clip in the middle of the connecting tube 800, when the spring clip is clamped, the connecting tube 800 can be closed to prevent water from flowing into the glass tube 400.

[0047] The operating principle of the present invention is as follows: when measuring the viscosity coefficient, because the diameter of capillary tube 500 is much smaller than that of drain tube 900, when the spring clamp is opened, the liquid in drain tube 900 first undergoes a short acceleration before entering a stable, uniform motion. During this stable, uniform motion, the air between the liquid and capillary tube 500 undergoes a near-isobaric compression process due to the liquid's slow push. The pressure at the left end of capillary tube 500 can be considered constant, creating a stable pressure differential between the left and right ends of capillary tube 500. Due to the low pressure provided by the liquid, the air flow rate is low, and because of the small diameter of capillary tube 500, the Reynolds number and Mach number are significantly below critical values. Consequently, the flow of gas within capillary tube 500 can be considered as stable, laminar flow of an incompressible fluid. In one embodiment, the viscosity coefficient of air is calculated according to Poiseuille's law in the prior art, and the calculation formula is as follows (see the prior art "Bao Shenrong, Determination of Viscosity Coefficient of Air [J], Journal of Jiujiang Teachers College, 1982, 0(2): 45-50"):

[0048]

[0049] Where m is the mass of the liquid column (the length of the liquid column h is the length of the pure water injected into the drain pipe 900 during the experiment), and m = ρ 液 V, idealize the liquid column into a cylinder, according to the volume formula of the cylinder V = πr 2 h (h is the length of the liquid column in this utility model), then m=ρ 液 πr 2 h. The present invention can measure all parameters by using existing technology, for example: the CD spacing L' of the calibration ruler 200 and the length L of the capillary 500 are measured with a ruler, and the density ρ of the liquid 液 Use pure water (density 1×10 3 kg / m 3), r represents the radius of the hydrophobic tube 900, R represents the radius of the capillary tube 500, the inner diameter of the hydrophobic tube 900 is measured using a vernier caliper, and the inner diameter of the capillary tube 500 is measured by a reading microscope.

[0050] In a specific embodiment, the present invention calculates the K value by adjusting the height of the drain pipe 900 and measuring the time t it takes for the experimental liquid (pure water) to flow across the CD ends of the calibration scale 200. Specifically, the drain pipe 900 is placed on a No. 6 fixing pin, creating an angle θ between the drain pipe 900 and the horizontal line. The height and length of the drain pipe 900 are then used to calculate sinθ. The experimental liquid (pure water) is then injected into the drain pipe 900, and the time t it takes for the pure water to flow across the CD ends of the calibration scale 200 is measured to obtain the inverse of time, 1 / t. With sinθ as the Y-axis and 1 / t as the X-axis, the slope of the graph of sinθ and 1 / t is calculated. This slope is the K value. Substituting the values ​​m, L', g, L, R, r, and K into the above formula, the air viscosity coefficient can be calculated.

[0051] By placing the hydrophobic tube 900 on fixed nails at different heights and measuring different times, the measurement results of the viscosity coefficient are verified by changing the experimental parameters.

[0052] Furthermore, in one embodiment, the drain tube 900 is made of a translucent polytetrafluoroethylene tube (e.g., a transparent Teflon tube (PTFE transparent tube)). Therefore, the polytetrafluoroethylene drain tube 900 may have some curvature. Therefore, during experiments, a glass sleeve can be placed over the drain tube 900. The inner diameter of the glass sleeve is larger than the outer diameter of the drain tube 900, for example, 1 mm larger than the outer diameter of the drain tube 900, to ensure the straightness of the drain tube 900. In another embodiment, the drain tube 900 can be made into a transparent tube.

[0053] Therefore, the measuring device in the present invention is an integrated measuring device. For example, in the present invention, the flow rate can be calculated by adjusting the height of the drain pipe 900 and measuring the time t for the experimental liquid (pure water) to flow through the two ends of CD on the calibration ruler 200.

[0054] Example 3

[0055] This embodiment provides a joint for connecting tube 800. During use, the two ends of connecting tube 800 need to be connected to drain tube 900 and glass tube 400, respectively. Because connecting tube 800 is a rubber tube, this can usually only be done by placing the two ends of connecting tube 800 over the drain tube 900 and glass tube 400, respectively, and then securing connecting tube 800 to drain tube 900 and glass tube 400 through friction. This connection method is laborious when securing or detaching connecting tube 800 from drain tube 900 and glass tube 400, and is inconvenient for replacing connecting tube 800. Therefore, this embodiment provides a joint.

[0056] like Figure 2 As shown, the joint includes a first connecting section 113 and a second connecting section 114 ; the first connecting section 113 and the second connecting section 114 are separated by a protrusion, wherein a fixing component is installed on the first connecting section 113 , and the second connecting section 114 is used to connect to the connecting pipe 800 .

[0057] like Figure 3 As shown, the fixing assembly includes a rotating seat 115 and a fixing rod 116; wherein, the rotating seat 115 is fixedly arranged on the outer wall of the first connecting section 113, and the fixing rod 116 is rotatably connected to the rotating seat 115; a through groove 117 is provided on the side wall of the first connecting section 113; when the fixing rod 116 rotates 90°, the end of the fixing rod 116 enters the interior of the first connecting section 113 through the through groove 117.

[0058] Further, such as Figure 4 As shown, a fixing head 118 is further provided at the end of the fixing rod 116 , and the fixing head 118 is fixedly connected to the fixing rod 116 (for example, welded or bonded).

[0059] Furthermore, the fixing head 118 is made of a material with a certain elasticity, such as rubber. By making the fixing head 118 of rubber, when the fixing head 118 contacts the drain pipe 900 or the glass pipe 400, the fixing head 118 will not damage the drain pipe 900 or the glass pipe 400 (e.g., Figure 5 shown).

[0060] Furthermore, a baffle 119 is provided inside the first connecting section 113 , and the baffle 119 is used for limiting and sealing when the joint is connected to the hydrophobic tube 900 or the glass tube 400 .

[0061] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0062] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A device for measuring viscosity, characterized in that: It comprises a mounting plate (110), on which a measuring component is arranged, and the measuring component is used to measure the viscosity coefficient; The measuring assembly comprises a scale (100), a calibration ruler (200) and a measuring pipe; wherein the scale (100) is fixedly arranged on one side of a mounting plate (110); a fixing nail (111) is arranged on the scale (100); a plurality of fixing nails (111) are provided; the plurality of fixing nails (111) pass through the scale (100) at equal intervals and are connected to the mounting plate (110); and the calibration ruler (200) is arranged on the inner side of the scale (100); The measuring pipeline comprises a hydrophobic tube (900), a connecting tube (800), a glass tube (400) and a capillary tube (500); one end of the hydrophobic tube (900) is in contact with a scale (100) and a calibration scale (200) respectively; the other end of the hydrophobic tube (900) is connected to the connecting tube (800), which is in turn connected to the glass tube (400), and the capillary tube (500) is arranged at the end of the glass tube (400).

2. A viscosity coefficient measuring device according to claim 1, characterized in that: There are 6 fixing nails (111), and the intervals between adjacent fixing nails (111) are 5 cm.

3. The viscosity coefficient measuring device according to claim 1, characterized in that: Support nails (112) are also provided on the mounting plate (110), and the support nails (112) are used to support the drain pipe (900).

4. A viscosity coefficient measuring device according to claim 3, characterized in that: Two supporting nails (112) are provided, and the two supporting nails (112) are respectively provided at both ends of the drain pipe (900).

5. The viscosity coefficient measuring device according to claim 1, characterized in that: The glass tube (400) is fixed to the mounting plate (110) by a cable tie (600).

6. The viscosity coefficient measuring device according to claim 1, characterized in that: A thermometer (300) is also provided on the mounting plate (110), and the thermometer (300) is used to measure the ambient temperature.

7. The viscosity coefficient measuring device according to claim 1, characterized in that: The connecting pipe (800) is a rubber tube.

8. The viscosity coefficient measuring device according to claim 1, characterized in that: A sealing device (700) is also provided in the middle of the connecting pipe (800), and the sealing device (700) is used to seal the connecting pipe (800).

9. A viscosity coefficient measuring device according to claim 8, characterized in that: The sealing device (700) adopts a spring clip.

10. The viscosity coefficient measuring device according to claim 9, characterized in that: A joint is also provided at the end of the connecting tube (800), and the joint is used to connect the connecting tube (800) to the hydrophobic tube (900) and the glass tube (400) respectively.

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