High-viscosity laminar liquid metering method and flowmeter

Abstract

The invention discloses a high-viscosity laminar liquid metering method and a flowmeter. The high-viscosity laminar liquid metering method is used for measuring through the flowmeter and comprises the steps that the theoretical mass M1 of liquid in a test round pipe is calculated; acquiring the current environment temperature; determining a temperature correction coefficient K corresponding to the current environment temperature according to the current environment temperature; the actual mass M of the liquid is calculated, and M = M1 * K. According to the high-viscosity laminar liquid metering method, the temperature compensation coefficient is introduced when the environment temperature is obtained, the temperature compensation coefficient corresponding to the current environment temperature is determined and the actual mass of the liquid is calculated, so that the influence caused by the temperature is eliminated, the accurate actual mass of the liquid at different temperatures can be measured, and the measurement precision is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid metering, and in particular to a high-viscosity laminar liquid metering method and a flow meter. Background Art

[0002] In the related art, the traditional liquid quality detection introduces the liquid into a container of known weight and obtains the mass of the liquid by an electronic scale. In the production process, when the mass of the liquid needs to be controlled and it is difficult to obtain the mass of the fluid by weight / electronic scale, a liquid flow meter is usually selected, such as a mechanical flow meter such as a screw, and then the mass of the liquid is calculated by the liquid density. However, when faced with high-viscosity liquids, the seal often fails due to mechanical movement wear, and then the measurement accuracy fails and the cost of replacing the flow meter is high. In addition, different temperatures affect the viscosity and density of the fluid, resulting in inaccurate measurement results. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a high-viscosity laminar flow liquid metering method, wherein the high-viscosity laminar flow liquid metering method eliminates the influence of temperature and can calculate the actual mass of the liquid.

[0004] The present invention also provides a flow meter, which is used in the above-mentioned high-viscosity laminar flow liquid metering method.

[0005] According to the high-viscosity laminar flow liquid metering method of the embodiment of the present invention, the measurement is performed by a flow meter and the flow meter includes a test round tube. The high-viscosity laminar flow liquid metering method includes:

[0006] Calculate the theoretical mass M1 of the liquid in the test tube;

[0007] Get the current ambient temperature;

[0008] Determine the temperature correction coefficient K corresponding to the current ambient temperature according to the current ambient temperature;

[0009] Calculate the actual mass M of the liquid, where M=M1×K.

[0010] According to the high-viscosity laminar liquid metering method of an embodiment of the present invention, by obtaining the ambient temperature, the temperature supplement coefficient corresponding to the current ambient temperature is determined, and the temperature compensation coefficient is introduced when calculating the actual mass of the liquid, thereby eliminating the influence of the temperature. The more accurate actual mass of the liquid at different temperatures can be measured, thereby improving the measurement accuracy.

[0011] According to some embodiments of the present invention, M1 = Q × ρ, Q = πr 4 △p / 8ηL

[0012] Among them, ρ is the theoretical density of the liquid, r is the radius of the test tube, L is the distance between the first position and the second position, the first position and the second position are spaced apart along the length direction of the test tube, △p is the pressure difference between the first position and the second position, and η is the viscosity coefficient of the liquid.

[0013] According to some embodiments of the present invention, there are multiple correction coefficients, and the multiple correction coefficients correspond to multiple ambient temperature values. Determining the temperature correction coefficient K corresponding to the current ambient temperature according to the current ambient temperature includes:

[0014] According to the current ambient temperature, select the temperature correction coefficient corresponding to the current ambient temperature.

[0015] In some embodiments of the present invention, obtaining multiple correction coefficients corresponding to multiple ambient temperatures includes:

[0016] Perform multiple calculations and measurements at multiple ambient temperatures to obtain the temperature correction coefficients at the corresponding temperatures.

[0017] In some embodiments of the present invention, obtaining the temperature correction coefficient calculation measurement includes:

[0018] Calculate the theoretical mass m1 of the discharged liquid;

[0019] Weigh the actual mass m2 of the discharged liquid;

[0020] The temperature correction coefficient K is calculated based on the theoretical mass m1 and the actual mass m2, where K = m1 / m2.

[0021] In some embodiments of the present invention, the calculating of the theoretical mass m1 of the discharged liquid comprises:

[0022] When the liquid is in a laminar static downward flow, obtain the cross-sectional area S1 and length L1 of the liquid column flowing out of the flow meter outlet;

[0023] Calculate the volume V1 of the liquid cylinder based on the cross-sectional area S1 and length L1;

[0024] The theoretical mass of the liquid m1 is calculated based on the volume V1 and the theoretical density ρ of the liquid, m1=ρV1.

[0025] In some embodiments of the present invention, the actual mass m2 of the discharged liquid is actually weighed by an electronic scale.

[0026] The flow meter according to an embodiment of the present invention is used in the above-mentioned high-viscosity laminar liquid metering method and includes:

[0027] A test circular tube, wherein the test circular tube is arranged horizontally;

[0028] A first joint, the first joint being connected to one end of the test round tube;

[0029] A second joint, the second joint being connected to the other end of the test round tube;

[0030] An output pipe is vertically arranged, and an upper end of the output pipe is connected to the second joint.

[0031] According to the flow meter of the embodiment of the present invention, a test circular tube is provided and the mass of the liquid is calculated using the test circular tube. The test circular tube has lower wear and tear, longer service life, more convenient and simple maintenance, and more accurate test results.

[0032] In some embodiments of the present invention, the present invention further includes: a first pressure sensor and a second pressure sensor, wherein the first pressure sensor and the second pressure sensor are both disposed on the test tube and are spaced apart in the length direction of the test tube.

[0033] In some embodiments of the present invention, it further includes: a mounting plate, which is disposed on the output pipe; and a camera, which is disposed on the mounting plate and is used to measure the diameter of the liquid column flowing out of the output pipe.

[0034] In some embodiments of the present invention, the output tube is inserted into the mounting plate, and there are a plurality of cameras, which are spaced apart from each other on the mounting plate along the circumferential direction of the output tube.

[0035] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0037] Figure 1 is a front view of a flow meter according to an embodiment of the present invention;

[0038] Figure 2 is a bottom view of a flow meter according to an embodiment of the present invention;

[0039] Figure 3 is a cross-sectional view of a test circular tube of a flow meter according to an embodiment of the present invention.

[0040] Reference numerals:

[0041] 100. Flow meter;

[0042] 1. Test round tube; 2. First joint; 3. Second joint; 4. Output tube; 5. Mounting plate; 6. Camera; 7. First pressure sensor; 8. Second pressure sensor. DETAILED DESCRIPTION

[0043] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] The following describes a high viscosity laminar flow liquid metering method according to an embodiment of the present invention with reference to the accompanying drawings, wherein the high viscosity laminar flow liquid metering method is measured by a flow meter 100 .

[0047] like Figure 1 As shown, the flow meter 100 includes a test tube 1, and the liquid can flow through the test tube 1. Along the length direction of the test tube 1, the inner wall diameter size of the test tube 1 keeps each section consistent, and the tube diameter will not change due to deformation of the material under high pressure. The inner wall of the test tube 1 is polished to ensure that the inner wall of the test tube 1 is smooth and free of distortion, and to ensure that the high-viscosity liquid performs stable laminar motion inside the test tube 1. If the viscosity of the liquid is too low, the flow rate is too fast, or there are unevenness or distortion inside the tube wall, it will affect the movement form of the fluid, changing from laminar flow to turbulent flow, and the pressure will become unstable.

[0048] In addition, the smooth cylindrical tube has less wear, longer service life, less maintenance frequency, and simple and convenient maintenance. However, the screw flow meter has greater wear and tear. Once worn, it will seriously affect the measurement accuracy and needs to be repaired or replaced every year.

[0049] Methods for metering high viscosity laminar liquids include:

[0050] Calculate the theoretical mass M1 of the liquid in the test tube 1; wherein the theoretical mass M1 of the liquid is the mass of the liquid at the theoretical density, and the theoretical density is the density at room temperature. At other temperatures, the density may vary. For example, the calculation may be performed on a terminal device such as a computer by obtaining relevant data of the test tube 1 and relevant data of the liquid. The terminal device may be used as a control module to perform corresponding control, storage, and calculation functions.

[0051] Get the current ambient temperature; Density is related to ambient temperature, and the ambient temperature can be used to determine whether the density of the liquid is the theoretical density. When the ambient temperature is the same as the room temperature, the actual density of the liquid is the theoretical density. When the ambient temperature is different from the room temperature, the actual density of the liquid is different from the theoretical density. The ambient temperature can be measured by a temperature sensor, and the measured ambient temperature can be transmitted to a terminal device for storage, analysis, and calculation. The temperature sensor can be located on the flow meter 100, and of course, it can also be located at other locations in the environment where the flow meter 100 is located.

[0052] The temperature correction coefficient K corresponding to the current ambient temperature is determined according to the current ambient temperature; when the ambient temperature is different from the room temperature of the theoretical density, a temperature correction coefficient is introduced to make the calculation result of the theoretical mass more accurate. Different temperatures correspond to different temperature correction coefficients. According to the current ambient temperature, the temperature correction coefficient corresponding to the current ambient temperature is determined to correct the actual mass of the liquid, thereby obtaining a more accurate actual mass of the liquid.

[0053] Calculate the actual mass M of the liquid, where M = M1 × K. The actual mass of the liquid is obtained by multiplying the correction coefficient by the theoretical mass, which is simple and convenient.

[0054] According to the high-viscosity laminar liquid metering method of an embodiment of the present invention, by obtaining the ambient temperature, the temperature supplement coefficient corresponding to the current ambient temperature is determined, and the temperature compensation coefficient is introduced when calculating the actual mass of the liquid, thereby eliminating the influence of the temperature. The more accurate actual mass of the liquid at different temperatures can be measured, thereby improving the measurement accuracy.

[0055] In some embodiments of the present invention, M1 = Q × ρ, Q = πr 4 △p / 8ηL,

[0056] Among them, ρ is the theoretical density of the liquid, r is the radius of the test tube 1, L is the distance between the first position and the second position, the first position and the second position are spaced apart along the length direction of the test tube 1, △p is the pressure difference between the first position and the second position, and η is the viscosity coefficient of the liquid.

[0057] It should be noted that the theoretical density of the liquid is the room temperature density, the radius of the test tube 1 is half of the inner diameter of the test tube 1, the distance between the first position and the second position is the distance between the center of the first position and the center of the second position, and the density and viscosity coefficient of the liquid are obtained according to the physical properties of different liquids.

[0058] A pressure sensor may be provided at the first position and the second position of the test tube 1 , respectively. The pressures P1 and P2 at the first position and the second position may be obtained respectively through the two sensors, Δp=|P1-P2|.

[0059] Since the density ρ and viscosity coefficient η of the liquid are not constants in the actual production process, they mainly change with temperature. For example, in the process of industrial quenching oil quenching, the quenching oil used generally needs to be heated, because the viscosity of the heated oil is lower than that at room temperature, the fluidity is better, and the heat conduction of the quenching workpiece is better. Therefore, the temperature correction coefficient is set to K, which is correlated with temperature. The actual mass formula of the liquid can be obtained: M = Kρπr 4 △p / 8ηL.

[0060] In some embodiments of the present invention, there are multiple correction coefficients, and the multiple correction coefficients correspond to multiple ambient temperature values. Determining the temperature correction coefficient K corresponding to the current ambient temperature according to the current ambient temperature includes:

[0061] According to the current ambient temperature, select the temperature correction coefficient corresponding to the current ambient temperature.

[0062] Multiple correction coefficients can be stored in the database of the terminal device, and multiple temperature values ​​are also stored in the database of the terminal device, and the multiple temperature values ​​have a corresponding relationship with the multiple correction coefficients. After measuring the current ambient temperature, after transmitting the current ambient temperature value to the terminal device, the terminal device can obtain the temperature correction coefficient corresponding to the current ambient temperature from the database, and then calculate the actual mass of the liquid according to the calculation formula of the actual liquid mass, thereby ensuring the accuracy of the calculation result and eliminating the influence of temperature on the calculation result.

[0063] In some embodiments of the present invention, obtaining multiple correction coefficients corresponding to multiple ambient temperatures includes:

[0064] Perform multiple calculations and measurements at multiple ambient temperatures to obtain the temperature correction coefficients at the corresponding temperatures.

[0065] It is understandable that the same liquid is calculated and measured at different ambient temperatures, the temperature correction coefficient corresponding to the ambient temperature is obtained and stored, so as to establish a database and store it in the terminal device. Of course, corresponding calculations and measurements can also be performed on multiple liquids respectively, and a larger database can be established. When calculating the actual mass of the liquid, the current ambient temperature is obtained. After calculating the theoretical mass of the liquid, the actual mass of the liquid is calculated based on the theoretical mass and the temperature correction coefficient corresponding to the current ambient temperature.

[0066] During measurement, the air pressure and temperature outside the flow meter 100 must be maintained and controlled within a constant range. The liquid inside the flow meter 100 will be affected by the flow rate and pressure difference due to changes in external pressure and temperature, thereby affecting the accuracy of the calculation structure.

[0067] In addition, the correction coefficients of the original temperatures of the liquid to be measured can be obtained through a gradient temperature test and then recorded and stored in the database of the terminal device. The gradient temperature test can be to first test at temperature A, and then increase the temperature value stepwise on the basis of temperature A, for example, to test once every degree increase, or to test once every degree decrease, for example, to test once every degree decrease.

[0068] Further, the calculation measurement for obtaining the temperature correction coefficient includes:

[0069] Calculate the theoretical mass m1 of the discharged liquid; the discharged liquid is the liquid discharged from the flow meter 100, such as Figure 1 As shown, the flow meter 100 includes an output pipe 4. The liquid flows out of the test round pipe 1 and flows to the output pipe 4, and then is discharged from the output pipe 4. The discharged liquid is the liquid discharged from the output pipe 4. The theoretical mass of the discharged liquid can be calculated by multiplying the volume of the discharged liquid by the theoretical density.

[0070] The actual mass m2 of the discharged liquid is actually weighed; for example, the liquid discharged by the flow meter 100 can be placed in a container, and the mass of the container containing the liquid can be weighed using an electronic scale, and then the weight of the weighed container itself is removed to obtain the actual mass of the discharged liquid.

[0071] The temperature correction coefficient K is calculated based on the theoretical mass m1 and the actual mass m2, where K = m1 / m2.

[0072] The actual mass of the liquid can be calculated by multiplying the theoretical mass and the temperature correction coefficient, thereby eliminating the influence of temperature and ensuring the accuracy of the measurement structure.

[0073] In some embodiments of the present invention, calculating the theoretical mass m1 of the discharged liquid includes:

[0074] When the liquid is in a laminar static flow, the cross-sectional area S1 and length L1 of the liquid cylinder flowing out of the flow meter 100 outlet are obtained; wherein, when the liquid is in a laminar static flow, the liquid flows stably and the measurement result is accurate. The cross-sectional area of ​​the liquid cylinder can be calculated by obtaining the diameter of the liquid cylinder. Figure 1 and Figure 2 As shown, the flow meter 100 includes a mounting plate 5, which is connected to the output tube 4 and is located at the upper end of the output tube 4. A camera 6 is provided on the mounting plate 5, and the diameter of the liquid cylinder can be obtained by photographing the liquid cylinder with the camera 6. In addition, the cameras 6 can be multiple cameras spaced apart along the circumferential direction of the output tube 4, and the multiple cameras 6 have different angles, and can photograph the liquid cylinder from different angles, thereby obtaining multiple diameter values. For example, Figure 2 In the example shown, there are four cameras 6 evenly spaced along the circumferential direction of the output tube 4. The four cameras 6 take pictures from different angles, and then fit calculations are performed on multiple diameters, such as taking an average of multiple diameters to obtain a final diameter value. The camera 6 may be a 2D camera.

[0075] The volume V1 of the liquid cylinder is calculated based on the cross-sectional area S1 and the length L1; the volume of the liquid cylinder can be obtained by multiplying the cross-sectional area and the length of the liquid cylinder.

[0076] The theoretical mass of the liquid m1 is calculated based on the volume V1 and the theoretical density ρ of the liquid, m1 = ρV1. The actual ambient temperature can be measured by the temperature sensor, and then the temperature correction coefficient corresponding to the measured actual temperature can be obtained from the database of the terminal device. The actual mass of the liquid can be obtained by the theoretical mass of the liquid and the temperature correction coefficient.

[0077] In some embodiments of the present invention, the mass of the discharged liquid is actually weighed by an electronic scale to obtain the actual mass. The liquid discharged by the flow meter 100 and corresponding to the liquid column can be placed in a container, and the mass of the container containing the liquid can be weighed by an electronic scale. The weight of the weighed container can then be subtracted to obtain the actual mass of the discharged liquid.

[0078] The flow meter 100 according to an embodiment of the present invention is described below.

[0079] like Figure 1 As shown, the flow meter 100 according to an embodiment of the present invention is used in the above-mentioned high-viscosity laminar liquid metering method and includes a test circular tube 1, a first joint 2, a second joint 3 and an output tube 4.

[0080] like Figure 1 and Figure 3As shown, the test tube 1 is horizontally arranged, and the flow and pressure of the liquid in the horizontally arranged test tube 1 are stable, which can ensure the accuracy of the measurement result. The first joint 2 is connected to one end of the test tube 1, and the first joint 2 can be connected to a liquid input device or a pipeline so that the liquid can flow to the test tube 1. Among them, the channel in the first joint 2 extends in the vertical direction.

[0081] The second joint 3 is connected to the other end of the test circular tube 1, the output tube 4 is vertically arranged, and the upper end of the output tube 4 is connected to the second joint 3. The test circular tube 1 and the output tube 4 are connected by setting the second joint 3, and the flow direction of the liquid can be adjusted so that the horizontal flow of the liquid is changed to vertical flow, which facilitates the liquid to discharge from the output tube 4 out of the flow meter 100.

[0082] Compared with the screw pump, the flow meter 100 of the present application has no moving parts and operates reliably. The inner wall of the test tube 1 is treated with anti-skid and wear-resistant treatment, and the pressure of each part is relatively uniform. Compared with the screw pump, the wear of the service life is reduced, the service life is longer, and the maintenance is convenient and simple.

[0083] According to the flow meter 100 of the embodiment of the present invention, a test circular tube 1 is provided and the mass of the liquid is calculated using the test circular tube 1. The test circular tube 1 has lower wear and tear, longer service life, more convenient and simple maintenance, and more accurate test results.

[0084] In some embodiments of the present invention, the flow meter 100 further includes a first pressure sensor 7 and a second pressure sensor 8, both of which are arranged on the test tube 1 and are spaced apart in the length direction of the test tube 1. The first pressure sensor 7 can be arranged at a first position, and the second pressure sensor 8 can be arranged at a second position. The pressures P1 and P2 at the first position and the second position can be obtained respectively by the two sensors, △p=|P1-P2|. The theoretical mass of the liquid can be calculated by the pressure difference between the first position and the second position, the distance between the first position and the second position, and the viscosity coefficient and theoretical density of the liquid, and then the actual mass of the liquid can be calculated according to the temperature correction coefficient.

[0085] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the flow meter 100 also includes a mounting plate 5 and a camera 6. Figure 1 and Figure 2 As shown, the mounting plate 5 is disposed on the output tube 4 and is located at the upper end of the output tube 4. The mounting plate 5 is perpendicular to the axis of the output tube 4. The camera 6 is disposed on the mounting plate 5 and is used to measure the diameter of the liquid column flowing out of the output tube 4. The camera 6 may be a 2D camera. It is simple and convenient to obtain the diameter of the liquid column through the camera 6.

[0086] Furthermore, if Figure 1and Figure 2 As shown, the output tube 4 is inserted into the mounting plate 5, and there are multiple cameras 6, which are arranged on the mounting plate 5 at intervals along the circumferential direction of the output tube 4. Thus, the liquid cylinder can be photographed from multiple angles, so as to obtain the diameter of the liquid cylinder measured from multiple angles, and the final diameter value can be obtained by fitting and calculating multiple diameter values, such as averaging, so as to make the calculation more accurate.

[0087] The method and flowmeter 100 of the present application can be applied to the volume and flow calculation of high-viscosity laminar fluids, and a higher measurement accuracy can be obtained. For low-viscosity fluids, it can be transformed into a vortex flowmeter based on the fluid vortex excitation. In addition, the present application introduces a temperature correction coefficient K, which calibrates the fluid volume through the camera 6, weighs and measures the fluid weight, and divides it by the theoretical value at room temperature to correct the viscosity and friction factors caused by temperature at different temperatures. Not only can the flow rate be measured, but also the mass of the liquid can be measured. It is suitable for occasions where there are requirements for fluid quality detection and offline measurement is inconvenient, and online monitoring is required.

[0088] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0089] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for measuring high viscosity laminar liquid, characterized in that: The high viscosity laminar flow liquid metering method comprises: Calculate the theoretical mass M1 of the liquid in the test tube; Get the current ambient temperature; Determine the temperature correction coefficient K corresponding to the current ambient temperature according to the current ambient temperature; Calculate the actual mass M of the liquid, where M=M1×K.

2. The high viscosity laminar liquid metering method according to claim 1, characterized in that: M1=Q×ρ,Q=πr 4 △p / 8ηL Among them, ρ is the theoretical density of the liquid, r is the radius of the test tube, L is the distance between the first position and the second position, the first position and the second position are spaced apart along the length direction of the test tube, △p is the pressure difference between the first position and the second position, and η is the viscosity coefficient of the liquid.

3. The high viscosity laminar flow liquid metering method according to claim 1, characterized in that: There are multiple correction coefficients, and the multiple correction coefficients correspond to multiple ambient temperature values. The temperature correction coefficient K corresponding to the current ambient temperature is determined according to the current ambient temperature, including: According to the current ambient temperature, select the temperature correction coefficient corresponding to the current ambient temperature.

4. The high viscosity laminar liquid metering method according to claim 3, characterized in that: Acquisition of multiple correction coefficients corresponding to multiple ambient temperatures includes: Perform multiple calculations and measurements at multiple ambient temperatures to obtain the temperature correction coefficients at the corresponding temperatures.

5. The high viscosity laminar liquid metering method according to claim 4, characterized in that: The calculated measurements to obtain the temperature correction factor include: Calculate the theoretical mass m1 of the discharged liquid; Weigh the actual mass m2 of the discharged liquid; The temperature correction coefficient K is calculated based on the theoretical mass m1 and the actual mass m2, where K = m1 / m2.

6. The high viscosity laminar flow liquid metering method according to claim 5, characterized in that: The calculation of the theoretical mass m1 of the discharged liquid includes: When the liquid is in a laminar static downward flow, obtain the cross-sectional area S1 and length L1 of the liquid column flowing out of the flow meter outlet; Calculate the volume V1 of the liquid cylinder based on the cross-sectional area S1 and length L1; The theoretical mass of the liquid m1 is calculated based on the volume V1 and the theoretical density ρ of the liquid, m1=ρV1.

7. The high viscosity laminar liquid metering method according to claim 5, characterized in that: The actual mass m2 of the discharged liquid is actually weighed by an electronic scale.

8. A flow meter, characterized in that: A method for measuring high viscosity laminar liquid according to any one of claims 1 to 7, comprising: A test circular tube, wherein the test circular tube is arranged horizontally; A first joint, the first joint being connected to one end of the test round tube; A second joint, the second joint being connected to the other end of the test round tube; An output pipe is vertically arranged, and an upper end of the output pipe is connected to the second joint.

9. The flow meter according to claim 8, characterized in that Also includes: A first pressure sensor and a second pressure sensor, wherein the first pressure sensor and the second pressure sensor are both arranged on the test circular tube and are spaced apart in the length direction of the test circular tube.

10. The flow meter according to claim 8, characterized in that Also includes: A mounting plate, the mounting plate being arranged on the output pipe; A camera is arranged on the mounting plate and is used for measuring the diameter of the liquid column flowing out of the output pipe.

11. The flow meter according to claim 10, characterized in that The output tube is inserted into the mounting plate, and there are a plurality of cameras, which are arranged on the mounting plate at intervals along the circumferential direction of the output tube.

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