Liquid physical property and critical Reynolds number measuring device based on laser diffraction

Abstract

The utility model discloses a liquid physical property and critical Reynolds number measuring device based on laser diffraction. The liquid physical property and critical Reynolds number measuring device comprises a bottom plate, a left water tank and a right water tank, a laser regulator is fixedly mounted on the upper side of the left end of the left water tank, and a low-frequency generator located on the left water tank is mounted on the right side of the laser regulator; a bearing plate is nested and attached to the right water tank, and a lifting adjusting structure for the optical screen is arranged on the bearing plate; a flow velocity measuring structure is arranged between the left water tank and the right water tank, and a liquid tracing structure is arranged on the left water tank. According to the liquid physical property and critical Reynolds number measuring device based on laser diffraction, multiple functions are integrated, the surface tension coefficient, the viscosity coefficient and the liquid flow speed of liquid can be measured conveniently, and the flowing state can be judged by observing the phenomenon of red ink in the first connecting pipe and the second connecting pipe conveniently; and the degradable red ink can prevent liquid in the left water tank and the right water tank from being polluted.

Description

Technical Field

[0001] This utility model relates to the field of liquid property and critical Reynolds number measurement technology, specifically a liquid property and critical Reynolds number measurement device based on laser diffraction. Background Technology

[0002] The Reynolds number is a dimensionless number that characterizes the flow of fluids. It can be used to distinguish whether the flow of a fluid is laminar or turbulent, to determine the resistance that a fluid experiences during flow, and to measure the surface tension coefficient of a liquid. The key to measuring the Reynolds number is to measure the fluid viscosity coefficient and the fluid velocity.

[0003] Common methods for measuring viscosity coefficient include the falling ball method, the rotating drum method, and the capillary method. The falling ball method has the advantages of convenient equipment and simple principle, but it is affected by many factors. The rotating drum method has a wide measurement range, but it is complicated to operate and has a large measurement error. The capillary method is simple to operate, but its repeatability is low.

[0004] Common methods for measuring liquid flow velocity include differential pressure method, float method, and laser Doppler velocity meter. The differential pressure method has the advantage of wide applicability, but it is greatly affected by fluid characteristics; the float method has simple equipment, but the measurement accuracy is extremely low; the capillary method has extremely high measurement accuracy, but the equipment cost is high. Therefore, we propose a liquid property and critical Reynolds number measurement device based on laser diffraction to solve the problems mentioned above. Utility Model Content

[0005] The purpose of this invention is to provide a liquid property and critical Reynolds number measuring device based on laser diffraction, so as to solve the problems mentioned in the background art, such as the complexity of operation and large measurement error of existing fluid viscosity coefficient and fluid velocity measurement.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a liquid property and critical Reynolds number measuring device based on laser diffraction, comprising a base plate and a left water tank and a right water tank respectively attached to the upper sides of the left and right ends of the base plate;

[0007] Also includes:

[0008] A laser regulator is fixedly installed on the upper left side of the left water tank, and a low-frequency generator located on the left water tank is installed on the right side of the laser regulator.

[0009] A support plate is nested and attached to the right water tank, and the support plate is provided with a lifting and adjusting structure for the light screen.

[0010] A flow rate measuring structure is provided between the left and right water tanks, and a liquid tracer structure is provided on the left water tank. A second water valve is installed on the inner side of the lower rear end of both the left and right water tanks.

[0011] The low-frequency generator is equipped with a dovetail slide, and a vibration source located to the lower right of the laser regulator is provided on the front side of the low-frequency generator. A mounting plate is fixedly installed on the vibration source, and the mounting plate is fixed to the low-frequency generator with screws.

[0012] The lifting and adjusting structure includes a fixed plate, an adjusting rod, a stepper motor, and a movable block. The fixed plate is fixedly connected to the upper surface of the middle right end of the receiving plate, and the adjusting rod is inserted through the fixed plate. The stepper motor connected to the adjusting rod is installed on the fixed plate.

[0013] The adjusting rod is threadedly connected to a movable block that fits against the fixed plate, and a light screen for mounting a linear array is fixedly connected to the movable block.

[0014] The flow rate measuring structure includes a first connecting pipe, a second connecting pipe, a turbine flow meter, a first water valve, and a water pump. The first connecting pipe and the second connecting pipe are respectively fixedly connected to the bottom of the left water tank and the right water tank. The first connecting pipe and the second connecting pipe are both equipped with a threaded turbine flow meter and a first water valve. The front side of the second connecting pipe is equipped with a water pump that is connected to the left water tank and the right water tank.

[0015] A microcontroller and a signal amplifier are fixedly installed on the upper left and upper right rear ends of the receiving plate, respectively, and the microcontroller, the signal amplifier, the turbine flow meter and the first water valve are connected by wires.

[0016] The liquid tracer structure includes a drip bottle, a drip tube, a speed controller, and a needle. The drip bottle is located on the upper front side of the left water tank, and the drip tube located inside the left water tank is connected to the lower part of the drip bottle. A speed controller is nested and installed outside the drip tube.

[0017] The needle is fixedly connected to the outside of the hanging tube, and the individual needles are located inside the first connecting tube and the second connecting tube respectively.

[0018] Compared with the prior art, the beneficial effects of this utility model are: the liquid property and critical Reynolds number measuring device based on laser diffraction is multifunctional and integrated, which makes it easy to measure the surface tension coefficient and viscosity coefficient of the liquid and the liquid flow rate, and makes it easy to observe the phenomenon of red ink in the first and second connecting pipes to judge the flow state. Furthermore, the degradable red ink can prevent the liquid in the left and right water tanks from being contaminated.

[0019] 1. The device is equipped with a base plate, a left water tank, a right water tank, and a laser regulator. The left and right water tanks are respectively attached to the upper sides of the left and right ends of the base plate. A receiving plate is nested and attached to the right water tank. The laser regulator and a low-frequency generator are fixedly installed on the upper part of the left water tank. The low-frequency generator is screwed to a mounting plate with a vibration source mounted on the lower side. A fixing plate with an inner engaging through-type adjusting rod is fixedly connected to the receiving plate. A stepper motor is connected to the adjusting rod, and a movable block that fits into the fixing plate is threaded to the outer side of the middle part of the adjusting rod. A light screen with a linear array is fixed to the left side of the movable block. Therefore, it is convenient to measure the surface tension coefficient and viscosity coefficient of the liquid.

[0020] 2. It is equipped with a left water tank, a right water tank, a first connecting pipe and a second connecting pipe. Since the left water tank and the right water tank are fixedly connected by the second connecting pipe and the first connecting pipe, which are set in front and behind, and both the first connecting pipe and the second connecting pipe are equipped with turbine flow meters and first water valves, and a water pump connected to the second connecting pipe is installed on the upper side of the front middle of the base plate, it is convenient to measure the liquid flow rate.

[0021] 3. It is equipped with a left water tank, a drip bottle, a drip pipe, and a speed controller. The drip bottle is attached to the upper front end of the left water tank, and the drip bottle is connected to the drip pipe located in the left water tank. The speed controller is nested and attached to the outside of the drip pipe. A needle is fixedly installed at the outer end of the drip pipe. The needle is nested in the first connecting pipe and the second connecting pipe respectively. Therefore, it is convenient to observe the phenomenon of red ink in the first connecting pipe and the second connecting pipe to judge the flow status. It can also degrade red ink and prevent the liquid in the left and right water tanks from being contaminated. Attached Figure Description

[0022] Figure 1 This is a frontal three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is a frontal perspective three-dimensional structural diagram of the present invention;

[0024] Figure 3 This is a frontal three-dimensional structural diagram of the connection between the low-frequency generator and the mounting plate of this utility model;

[0025] Figure 4 This is a front view structural diagram of the connection between the drip bottle and the drip tube of this utility model.

[0026] In the diagram: 1. Base plate; 2. Left water tank; 3. Right water tank; 4. Laser regulator; 5. Low-frequency generator; 6. Dovetail slide; 7. Vibration source; 8. Mounting plate; 9. Support plate; 10. Fixing plate; 11. Adjusting rod; 12. Stepper motor; 13. Movable block; 14. Light screen; 15. Microcontroller; 16. Signal amplifier; 17. First connecting pipe; 18. Second connecting pipe; 19. Turbine flow meter; 20. First water valve; 21. Water pump; 22. Second water valve; 23. Drip bottle; 24. Drip pipe; 25. Speed ​​controller; 26. Needle. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1-4 This utility model provides a technical solution: a liquid property and critical Reynolds number measuring device based on laser diffraction, comprising a base plate 1, a left water tank 2, a right water tank 3, a laser regulator 4, a low-frequency generator 5, a dovetail slide 6, a vibration source 7, a mounting plate 8, a receiving plate 9, a fixing plate 10, an adjusting rod 11, a stepper motor 12, a movable block 13, a light screen 14, a microcontroller 15, a signal amplifier 16, a first connecting pipe 17, a second connecting pipe 18, a turbine flow meter 19, a first water valve 20, a water pump 21, a second water valve 22, a drip bottle 23, a drip pipe 24, a speed controller 25, and a needle 26. The left water tank 2 and the right water tank 3 are respectively attached to the upper sides of the left and right ends of the base plate 1. The laser regulator 4 is fixedly installed on the upper left side of the left water tank 2, and the low-frequency generator 5 is installed on the right side of the laser regulator 4 on the left water tank 2. The receiving plate 9 is nested and attached to the right water tank 3. The receiving plate 9 is provided with a lifting and adjusting structure for the light screen 14. The lifting and adjusting structure includes a fixed plate 10, an adjusting rod 11, a stepper motor 12, and a movable block 13. The fixed plate 10 is fixedly connected to the upper surface of the middle right end of the receiving plate 9. A flow rate measuring structure is provided between the left water tank 2 and the right water tank 3. The flow rate measuring structure includes a first connecting pipe 17, a second connecting pipe 18, a turbine flow meter 19, a first water valve 20, and a water pump 21. The first connecting pipe 17 and the second connecting pipe 18 are respectively fixedly connected to the inner side of the lower front end and the inner side of the middle lower end of the left water tank 2 and the right water tank 3, respectively. A liquid tracer structure is provided on the left water tank 2. The liquid tracer structure includes a drip bottle 23, a drip tube 24, a speed controller 25, and a needle 26. The drip bottle 23 is located on the upper front end of the left water tank 2. A second water valve 22 is installed on the inner side of the lower rear end of both the left water tank 2 and the right water tank 3.

[0029] Working principle: such as Figure 1 , Figure 2 and Figure 3 The operator can first operate the laser adjuster 4 installed on the upper left side of the base plate 1, which is attached to the left water tank 2, so that the laser light source is directed into the vibration source 7 set on the lower front side of the low frequency generator 5. Then, the diffraction of the vibration source 7 is reflected by the left water tank 2 to the top of the right water tank 3. During this process, the small displacement of the vibration source 7 can be achieved by the dovetail slide 6 in the horizontal and vertical directions, and the data can be accurately read. The microcontroller 15 fixedly installed on the upper left rear end of the receiving plate 9 can control the stepper motor 12 installed on the fixed plate 10 to perform the operation. The stepper motor 12 drives the adjusting rod 11 connected to it to rotate under the locking limit of the fixed plate 10. An external threaded connection is provided with a movable block 13 that fits against the fixed plate 10. A light screen 14 is fixedly installed on the left side of the movable block 13. Therefore, through the operation of the stepper motor 12, the adjusting rod 11 can drive the movable block 13 to rise and fall under the contact limit of the fixed plate 10, so that the movable block 13 can drive the light screen 14 to rise and fall, so as to make the laser light source reflect diffraction fringes on the light screen 14. The light intensity data can be sensed by the linear array installed in the light screen 14, and then imported into the microcontroller 15 and input into the processing software to obtain the diffraction spot spacing and the light intensity ratio of the first and second order fringes. Then, the surface tension coefficient and viscosity coefficient of the liquid can be obtained by measuring multiple sets of data.

[0030] like Figure 1 , Figure 3 and Figure 4 In the use of this measuring device, a second connecting pipe 18 is fixedly connected to the inner side of the lower front end of the left water tank 2 and the right water tank 3, and a first connecting pipe 17 is fixedly connected to the inner side of the lower end of the left water tank 2 and the right water tank 3. A turbine flow meter 19 and a first water valve 20 are respectively fixedly installed on the inner side of the middle part of the first connecting pipe 17 and the inner side of the right end of the second connecting pipe 18. A water pump 21 connected to the left water tank 2 and the right water tank 3 is installed on the upper side of the middle part of the front end of the base plate 1. The operation of the water pump 21 is controlled by the microcontroller 15, so that a liquid level difference is generated in the left water tank 2 and the right water tank 3, and then the first water valve 20 can be opened. 0, so that flow is generated in the first connecting pipe 17 and the second connecting pipe 18, so that the flow rate can be measured by the turbine flow meter 19. Then, the data is imported into the microcontroller 15 through the signal amplifier 16, so that the liquid flow rate in the first connecting pipe 17 and the second connecting pipe 18 can be displayed on the external computer in real time (the diameter of the first connecting pipe 17 is larger than that of the second connecting pipe 18, so that the two different pipes can be used to measure the Reynolds number and repeat the test, because the Reynolds number is proportional to the pipe diameter. The two connecting pipes have the same function, and there is a flow meter in the middle of the two pipes, which can measure the flow rate separately).

[0031] like Figure 1 , Figure 2 and Figure 4 A drip bottle 23 is attached to the upper front side of the left water tank 2. A pipe 24 located inside the left water tank 2 is fixedly connected to the drip bottle 23. A needle 26 is fixedly installed at the outer end of the pipe 24. The needle 26 is nested in the first connecting pipe 17 and the second connecting pipe 18 respectively. Therefore, the operator can operate the speed controller 25 nested and attached to the outside of the pipe 24 to control the flow and velocity of water and biodegradable red ink in the drip bottle 23. This facilitates the observation of the phenomena in the first connecting pipe 17 and the second connecting pipe 18. By observing the biodegradable red ink, the flow state of the liquid can be judged. When the trace of red ink changes from turbulent flow to transitional flow and from transitional flow to laminar flow, the flow velocity at this time should be recorded to calculate the critical Reynolds number of the liquid. The biodegradability of the red ink can be used to prevent the liquid in the left water tank 2 and the right water tank 3 from being contaminated and reduce resource waste. All the electrical components mentioned above are existing technologies and will not be described in detail here.

[0032] The contents not described in detail in this specification are existing technologies known to those skilled in the art. All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0033] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A liquid property and critical Reynolds number measuring device based on laser diffraction, comprising a base plate (1), a left water tank (2) and a right water tank (3) respectively attached to the upper sides of the left and right ends of the base plate (1); Its features also include: A laser regulator (4) is fixedly installed on the upper left side of the left water tank (2), and a low-frequency generator (5) located on the left water tank (2) is installed on the right side of the laser regulator (4). The right water tank (3) is nested with a support plate (9), and the support plate (9) is provided with a lifting and adjusting structure for the light screen (14); A flow rate measuring structure is provided between the left water tank (2) and the right water tank (3), and a liquid tracer structure is provided on the left water tank (2). A second water valve (22) is installed on the inner side of the lower rear end of both the left water tank (2) and the right water tank (3).

2. The device for measuring liquid properties and critical Reynolds number based on laser diffraction according to claim 1, characterized in that: The low-frequency generator (5) is equipped with a dovetail slide (6), and a vibration source (7) located to the lower right of the laser regulator (4) is provided on the front side of the low-frequency generator (5). A mounting plate (8) is fixedly installed on the vibration source (7), and the mounting plate (8) is screwed onto the low-frequency generator (5).

3. The device for measuring liquid properties and critical Reynolds number based on laser diffraction according to claim 1, characterized in that: The lifting and adjusting structure includes a fixed plate (10), an adjusting rod (11), a stepper motor (12), and a movable block (13). The fixed plate (10) is fixedly connected to the upper surface of the middle right end of the receiving plate (9). The adjusting rod (11) is inserted through the fixed plate (10). The stepper motor (12) connected to the adjusting rod (11) is installed on the fixed plate (10). The adjusting rod (11) is threadedly connected to a movable block (13) that fits against the fixed plate (10), and a light screen (14) for mounting a linear array is fixedly connected to the movable block (13).

4. The device for measuring liquid properties and critical Reynolds number based on laser diffraction according to claim 1, characterized in that: The flow rate measuring structure includes a first connecting pipe (17), a second connecting pipe (18), a turbine flow meter (19), a first water valve (20), and a water pump (21). The first connecting pipe (17) and the second connecting pipe (18) are fixedly connected to the bottom of the left water tank (2) and the right water tank (3), respectively. The first connecting pipe (17) and the second connecting pipe (18) are both equipped with a threaded turbine flow meter (19) and a first water valve (20). The front side of the second connecting pipe (18) is equipped with a water pump (21) that is connected to the left water tank (2) and the right water tank (3).

5. The device for measuring liquid properties and critical Reynolds number based on laser diffraction according to claim 1, characterized in that: A microcontroller (15) and a signal amplifier (16) are fixedly installed on the upper left and upper right rear ends of the receiving plate (9), respectively, and the microcontroller (15), the signal amplifier (16), the turbine flow meter (19) and the first water valve (20) are connected by wires.

6. The device for measuring liquid properties and critical Reynolds number based on laser diffraction according to claim 1, characterized in that: The liquid tracer structure includes a drip bottle (23), a drip tube (24), a speed controller (25), and a needle (26). The drip bottle (23) is located on the upper front end of the left water tank (2), and the drip tube (24) located in the left water tank (2) is connected to the lower part of the drip bottle (23). The speed controller (25) is nested outside the drip tube (24). The needle (26) is fixedly connected to the outside of the hanging tube (24), and the needle (26) is located in the first connecting tube (17) and the second connecting tube (18) respectively.

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