Pulsation pump for achieving accurate sinusoidal flow rate

Abstract

The present invention provides a pulsation pump for achieving an accurate sinusoidal flow rate, wherein the pulsation pump generates dynamic vibrations with respect to the flow rate when a material to be measured flows in a pipe. The pulsation pump comprises: an upstream pulsation generation unit and a downstream pulsation generation unit that are sequentially disposed spaced apart from each other in the movement direction of the material to be measured and generate dynamic vibrations in the material to be measured; and a measurement unit that is disposed between the upstream pulsation generation unit and the downstream pulsation generation unit and measures the waveform of the material to be measured, wherein the upstream pulsation generation unit and the downstream pulsation generation unit are driven oppositely to each other and induce different dynamic vibrations in the material to be measured.

Description

Pulsating pump that implements accurate sine wave flow rate

[0001] The present invention relates to a pulsating pump that implements an accurate sinusoidal flow rate by generating an accurate sinusoidal dynamic oscillatory oscillation of the flow rate when a substance (fluid) flows in a pipe.

[0002] The flow and deformation that a material undergoes during the process of manufacturing a product have a decisive impact on the quality and characteristics of the final product, and the unique properties that a material exhibits during the process of flowing and deforming are the representative rheological properties of that material.

[0003] Secondary battery materials, including plastics, films, adhesives, fibers, and cosmetics, which have recently attracted increasing industrial interest, are complex fluids with a very complex structure consisting of a mixture of organic and inorganic substances. Since they are processed into products through complex flow and deformation processes, understanding the material's inherent rheological properties is essential in the processing process.

[0004] The method of measuring rheological properties is to use a rheometer, which is a device that measures rheological properties with high accuracy by implementing various types of flow fields, to apply deformation or stress to a material and measure the resulting stress or deformation to obtain a unique material function (rheological property).

[0005] Among various flows, the most commonly used experiment to measure the intrinsic viscoelastic properties of materials is dynamic oscillatory shear. Unlike steady shear flow applied in one direction, oscillatory shear deformation with a sinusoidal periodicity is applied in both directions while fixing the angular frequency (ω) or amplitude (strain amplitude), and the resulting stress change is measured as a function of frequency (ω) or amplitude ( ) is a method of measuring rheological properties according to a function.

[0006] When oscillatory shear deformation is applied, a material with viscoelasticity accumulates deformation energy as stress inside the material, which is expressed as the storage modulus (G′), indicating the elasticity of the material, and the energy given to the material is lost through energy dissipation, which is expressed as the loss modulus (G″), indicating the viscosity of the material.

[0007] Especially in industries that utilize various polymer composites, including secondary batteries, various processes exist, including mixing, coating, and printing. Therefore, changes in material properties under each process condition are a highly sensitive issue. From this perspective, real-time monitoring of the viscoelastic rheological properties (linear and nonlinear) of composite fluids can be of great help in actual process analysis and optimization.

[0008] However, in the past, when implementing dynamic vibration, there was a problem of difficulty in implementing a desired waveform, such as an accurate sine wave, a multi-mode with multiple frequencies, or an arbitrary waveform with a period.

[0009] This related technology for generating dynamic vibrations for flow rate is presented in Korean Patent No. 10-1103792 (January 2, 2012).

[0010] The purpose of the present invention is to provide a pulsating pump that implements an accurate sine wave flow rate, which enables generation of a desired waveform, such as an accurate sine wave, a multi-mode having multiple frequencies, or an arbitrary waveform having a period, when implementing dynamic vibration of a fluid in a pipe.

[0011] The present invention provides a pulsation pump that implements an accurate sine wave flow rate that generates dynamic vibrations for a flow rate when a substance to be measured flows in a pipe, the pulsation pump comprising: a potential pulsation generating unit and a rear pulsation generating unit that are sequentially arranged to be spaced apart from each other in the direction of movement of the substance to be measured and generate dynamic vibrations in the substance to be measured; and a measuring unit that is arranged between the potential pulsation generating unit and the rear pulsation generating unit and measures a waveform of the substance to be measured, wherein the potential pulsation generating unit and the rear pulsation generating unit are driven in opposite directions to each other, thereby implementing an accurate sine wave flow rate that generates different dynamic vibrations in the substance to be measured.

[0012] The pulsating pump for implementing an accurate sine wave flow rate according to the present invention has a front pulsating generation unit and a rear pulsating generation unit sequentially arranged to be spaced apart from each other in the direction of movement of the material to be measured, and the front pulsating generation unit and the rear pulsating generation unit are driven in opposite directions to induce different dynamic vibrations in the material to be measured, so that when generating dynamic vibrations of the material to be measured in a pipe, it is possible to generate a desired waveform, such as a sine wave, a multi-mode having multiple frequencies, or an arbitrary waveform having a period.

[0013] FIG. 1 is a schematic diagram showing a pulsating pump that implements an accurate sine wave flow rate according to one embodiment of the present invention.

[0014] FIG. 2 is a schematic diagram showing a pulsating pump that implements accurate sine wave flow rate according to another embodiment of the present invention.

[0015] FIG. 3 is a configuration diagram of a pulsation pump that implements accurate sine wave flow rate according to one embodiment of the present invention, in which a front pulsation generating unit and a rear pulsation generating unit are applied as a piston and camshaft structure.

[0016] Fig. 4 is a cross-sectional view showing a cam shape according to the embodiment of the camshaft illustrated in Fig. 3.

[0017] FIG. 5 and FIG. 6 are configuration diagrams of a pulsation pump that implements accurate sine wave flow rate according to one embodiment of the present invention, in which a front pulsation generating unit and a rear pulsation generating unit are applied with a diaphragm structure.

[0018] Fig. 7 is a cross-sectional view showing the measuring part and the remaining parts of a pulsating pump that implements accurate sine wave flow rate according to one embodiment of the present invention.

[0019] FIG. 8 is a graph showing the results of measuring the flow rate and pressure drop according to the wall shear rate at the measuring section when the front and rear pulsation generating sections of the pulsation pump implementing an accurate sine wave flow rate according to one embodiment of the present invention are moved at an angular frequency ω0.

[0020] FIG. 9 is a graph comparing the flow rate according to the wall shear rate in the measuring section and the remaining section when the front pulsation generating section and the rear pulsation generating section of the pulsation pump implementing an accurate sine wave flow rate according to one embodiment of the present invention are moved at an angular frequency ω0.

[0021] Fig. 10 is a graph showing the pressure change in the longitudinal direction in the measuring section at a specific time of a pulsating pump that implements an accurate sine wave flow rate according to one embodiment of the present invention.

[0022] Fig. 11 is a diagram showing the flow state of a material to be measured when the front pulsation generating unit and the rear pulsation generating unit of a pulsation pump that implements an accurate sine wave flow rate according to one embodiment of the present invention move at an angular frequency ω0.

[0023] Fig. 12 is a diagram showing the result of simulating the influence area by the front pulsation generating unit and the rear pulsation generating unit of a pulsation pump that implements an accurate sine wave flow rate according to one embodiment of the present invention.

[0024] Fig. 13 is a cross-sectional view for simulation of a pipe in which a front pulsation generating unit and a rear pulsation generating unit of a pulsation pump that implements an accurate sine wave flow rate according to one embodiment of the present invention are applied as a diaphragm structure.

[0025] Fig. 14 is a graph showing the results of measuring the flow rate and pressure drop according to the wall shear rate at the measuring section when the front pulsation generating section and the rear pulsation generating section of the pulsation pump implementing an accurate sine wave flow rate according to one embodiment of the present invention move at an angular frequency ω0 when applied as a diaphragm structure.

[0026] FIG. 15 is a graph showing the results of measuring the flow rate and pressure drop according to the wall shear rate in the remaining portion when the front pulsation generating unit and the rear pulsation generating unit of a pulsation pump implementing an accurate sine wave flow rate according to one embodiment of the present invention move at an angular frequency ω0 when applied as a diaphragm structure.

[0027] Fig. 16 is a graph showing the results of comparing the flow rate results of the measuring part and the remaining part when the front pulsation generating part and the rear pulsation generating part of the pulsation pump that implements accurate sine wave flow rate according to one embodiment of the present invention are applied as diaphragm structures.

[0028] Fig. 17 is a graph showing the pressure change in the longitudinal direction in the measuring section at a specific time when the front pulsation generating section and the rear pulsation generating section of the pulsation pump that implements an accurate sine wave flow rate according to one embodiment of the present invention are applied as a diaphragm structure.

[0029] Fig. 18 is a graph showing the results of simulating the influence area of ​​a pipe in which a front pulsation generating unit and a rear pulsation generating unit of a pulsation pump that implements an accurate sine wave flow rate according to one embodiment of the present invention are applied as a diaphragm structure.

[0030] FIG. 19 is a graph showing single mode and multimode of a pulsating pump that implements accurate sine wave flow rate according to one embodiment of the present invention.

[0031] FIG. 20 is a graph showing an arbitrary waveform by a pulsating pump that implements an accurate sine wave flow rate according to one embodiment of the present invention.

[0032] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concepts of terms to best explain his or her invention, they should be interpreted in a way that conforms to the technical spirit of the present invention.

[0033] Referring to Fig. 1, a pulsating pump for implementing an accurate sine wave flow rate according to one embodiment of the present invention may include a front pulsating generation unit (100), a rear pulsating generation unit (200), and a measuring unit (300). The pulsating pump for implementing the accurate sine wave flow rate generates dynamic vibrations in response to the flow rate when a material (fluid) to be measured flows within a pipe (10).

[0034] Here, the pipe (10) can be applied in shapes such as square, rectangle, triangle, etc. in addition to shapes that do not change in the longitudinal direction while having a generally used circular cross-section. At this time, regardless of the cross-sectional shape of the pipe (10), the potential pulsation generating unit (100) and the rear pulsation generating unit (200) to be described later can be applied as an actuator or diaphragm including a piston (a), a camshaft (b), and a rotary driving means (c), and additionally, pipe (10) shapes such as square, rectangle, and triangle with relatively complex shapes can be applied as a diaphragm arranged around the perimeter of the pipe (10).

[0035] And, when the above pipe (10) is applied as an actuator composed of a piston (a), a camshaft (b), and a rotary driving means (c), the above potential pulsation generating unit (100) and the above rear pulsation generating unit (200) can use a T-shaped pipe for positioning the piston (a).

[0036] In addition, a separate hole or pipe may be connected to the above pipe (10) so that a pressure gauge (not shown) and a flow meter (not shown) can be connected to measure pressure and flow rate through the measuring unit (300).

[0037] In addition, the wall transfer rate by the average flow rate of the measured substance flowing in the pipe (10) should be less than 10, and the ratio of wall shear rate must be less than 0.1.

[0038] The above potential pulsation generating unit (100) and the above rear pulsation generating unit (200) generate dynamic vibrations in the measurement target material flowing inside the pipe (10).

[0039] At this time, the above-mentioned potential pulsation generating unit (100) and the above-mentioned potential pulsation generating unit (200) are driven in opposite directions to each other, thereby inducing different dynamic vibrations in the measurement target material in the pipe (10).

[0040] In addition, the above-mentioned potential pulse generator (100) and the above-mentioned potential pulse generator (200) have the same frequency and opposite displacements, and can be driven in opposite directions.

[0041] The above potential pulse generator (100) and the above rear pulse generator (200) are each connected to the pipe (10) and can be sequentially arranged to be spaced apart from each other in the direction of movement of the material to be measured.

[0042] The potential pulsation generating unit (100) may be positioned in an area where the flow of the material to be measured is fully developed from the inlet (10a) of the pipe (10). In one embodiment, the potential pulsation generating unit (100) may be positioned at a position where the length 'L1' in the direction of movement of the material to be measured from the inlet (10a) of the pipe (10) is at least five times the diameter 'D' of the pipe (10).

[0043] In addition, the rear pulsation generating unit (200) may also be positioned in an area where the flow of the material to be measured is fully developed. In one embodiment, the rear pulsation generating unit (200) may be positioned at a position where the length 'L3' in the direction of movement of the material to be measured from the measuring unit (300) is at least 5 times the diameter 'D' of the pipe (10).

[0044] Referring to FIG. 2, the potential pulse generator (100) and the rear potential pulse generator (200) may be provided in multiple numbers so that multiple frequencies are generated when dynamic vibration of the measurement target material in the pipe (10) is generated.

[0045] In one embodiment, the potential pulse generation unit (100) may include a first potential pulse generation means (100a) and a second potential pulse generation means (100b) that are sequentially arranged to be spaced apart from each other in the direction of movement of the measurement target material within the pipe (10).

[0046] The above first potential pulsation generating means (100a) is driven in the opposite direction to the second potential pulsation generating means (200b) to be described later.

[0047] In addition, the rear pulsation generating unit (200) may include a first rear pulsation generating means (200a) and a second rear pulsation generating means (200b) that are sequentially arranged to be spaced apart from each other in the direction of movement of the measurement target material within the pipe (10).

[0048] The first rear pulsation generating means (200a) and the second front pulsation generating means (100b) are driven in opposite directions.

[0049] Here, the first potential pulsation generating means (100a) and the second potential pulsation generating means (200b) having the same frequency can be driven in opposite directions, and the second potential pulsation generating means (100b) and the first potential pulsation generating means (200a) having the same frequency can be driven in opposite directions.

[0050] Referring to FIG. 3, each of the aforementioned potential pulsation generating unit (100) and the aforementioned rear pulsation generating unit (200) may include a piston (a), a camshaft (b), and a rotary driving means (c).

[0051] The above piston (a) can be arranged to be connected to the pipe (10).

[0052] In addition, the piston (a) is elastically supported by an elastic member (a1), so that when the state of being pushed upward through the cam (b1) is released when the camshaft (b) rotates, it can move downward again by the elastic restoring force of the elastic member (a1).

[0053] The above camshaft (b) is connected to a rotary drive means (c), and rotation is achieved through the rotary force generated from the rotary drive means (c).

[0054] In this case, the camshaft (b) may be provided with a cam (b1) that causes the piston (a) to reciprocate.

[0055] Here, the frequency and displacement of dynamic vibration generated in the material to be measured within the pipe (10) may vary depending on the shape of the cam (b1). The frequency and displacement of dynamic vibration generated in the material to be measured within the pipe (10) may vary depending on the number and shape of the lobes of the cam (b1).

[0056] As an example, referring to FIG. 4, the cam shape of FIG. 4(a) can be generated with a frequency of ω, the cam shape of FIG. 4(b) can be generated with a frequency of 2ω, the cam shape of FIG. 4(c) can be generated with a frequency of 3ω, and the cam shape of FIG. 4(d) can be generated with a frequency of 4ω.

[0057] Here, a gear (not shown) structure may be applied as a means of connecting the rotational force of the rotary drive means (c) to the piston (a). Here, the frequency and displacement can be controlled by adjusting the gear ratio, size, and shape when connecting the gears. In addition, multiple frequency ranges and displacements can be controlled by connecting multiple gears.

[0058] The above-mentioned rotary driving means (c) is connected to the camshaft (b) and generates a rotary force to rotate the camshaft (b). Here, the above-mentioned rotary driving means (c) may be a motor.

[0059] In addition, as shown in FIGS. 5 and 6, the above-described potential pulse generator (100) and the above-described rear pulse generator (200) can be applied as a pump structure such as a diaphragm.

[0060] In this way, when the above-mentioned potential pulse generator (100) and the above-mentioned rear pulse generator (200) are applied as diaphragms, a non-contact design is also possible for a measurement target material having incompressible fluid properties.

[0061] In particular, when the above-described potential pulsation generating unit (100) and the above-described rear pulsation generating unit (200) are applied as diaphragms as shown in FIG. 6, when the diaphragm is arranged around the pipe (10), compression and expansion are possible in all directions of the pipe (10), and stable dynamic vibration can be induced without being restricted by the shape of the pipe (10).

[0062] The above measuring unit (300) can be placed between the above potential pulse generation unit (100) and the above potential pulse generation unit (200).

[0063] At this time, the measuring unit (300) may be placed at a position where the length 'L2' in the direction of movement of the material to be measured from the potential pulse generating unit (100) is at least 5 times the diameter 'D' of the pipe (10).

[0064] The above measuring unit (300) is connected to the pipe (10) and can measure the waveform of the measurement target substance flowing within the pipe (10). The measuring unit (300) may include a pressure gauge and a flow meter that measure the pressure and flow rate of the measurement target substance flowing within the pipe (10).

[0065] A method for generating an accurate sine wave using a pulsating pump that implements an accurate sine wave flow rate according to one embodiment of the present invention is described as follows.

[0066]

[0067] [Contact type: When the front pulsation generator (100) and the rear pulsation generator (200) are applied to the piston and camshaft, a complete sine wave is generated]

[0068] As shown in Fig. 3, the viscosity inside the pipe (10) The material to be measured flows at a flow rate Q0 in the pipe (10), and by controlling the displacement δ0 and the angular frequency ω0 of the potential pulsation generating unit (100) and the rear pulsation generating unit (200), various dynamic vibrations desired by the user can be generated.

[0069]

[0070] When the flow rate Q(t) of the material to be measured in the above pipe (10) oscillates periodically, the mean flow rate Q0 is sufficiently small, and the fluctuation flow rate size Q ε If this average flow rate is less than Q0, the pressure drop measured in the pipe (10) has a phase difference δ and can be expressed as in mathematical equations 1 and 2.

[0071]

[0072]

[0073] Variable flow rate and fluctuating pressure drop It can be seen that the displacement δ0 and the angular frequency ω0 of the above-mentioned potential pulse generator (100) and the rear potential pulse generator (200) can be controlled.

[0074] Fig. 7 is a drawing showing a measuring part (300) and a residual part in a structure in which each of the above-mentioned potential pulse generator (100) and the rear pulsation generator (200) is one. In the area corresponding to the measuring part (300), the flow rate and pressure drop are measured. In the residual part area, the flow rate and pressure drop are measured after passing through both the above-mentioned potential pulse generator (100) and the rear pulsation generator (200), which move in opposite phases.

[0075] When the above-mentioned potential pulsation generating unit (100) and the rear pulsation generating unit (200) are moved at an angular frequency ω0, the flow rate and pressure drop measured by the measuring unit (300) are measured as a complete sine wave expressed by an angular frequency ω0 and a phase difference δ. In the case of the flow rate and pressure drop measured in the remaining part, the pulsation generated by the above-mentioned potential pulsation generating unit (100) is canceled out by the rear pulsation generating unit (200).

[0076] In a structure in which each of the above-mentioned potential pulsation generating unit (100) and the rear pulsation generating unit (200) is one, when a flow rate Q0 flows through the pipe (10) whose cross-section is circular and has no shape change in the longitudinal direction, the above-mentioned potential pulsation generating unit (100) and the rear pulsation generating unit (200) move in opposite phases, and the magnitude of the displacement of the above-mentioned potential pulsation generating unit (100) and the rear pulsation generating unit (200) is controlled by δ0. If the cross-sectional area of ​​the above potential pulsation generating unit (100) and the rear pulsation generating unit (200) is A, and the frequency of the above potential pulsation generating unit (100) and the rear pulsation generating unit (200) is ω, the displacement d(t) and the velocity v(t) of the above potential pulsation generating unit (100) and the rear pulsation generating unit (200) can be expressed as in mathematical expression 3, and the correlation between the displacement and the flow rate can be expressed as in mathematical expression 4.

[0077]

[0078]

[0079] In a pipe (10) with a radius R, the wall shear rate is It is defined as the average flow rate Q0 and the variable flow rate Q ε By substituting the wall shear rate by the average flow rate and wall shear rate due to fluctuating flow rate can be expressed as in mathematical formula 5.

[0080]

[0081] Wall shear rate due to fluctuating flow rate is the wall shear rate by average flow rate The simulation was performed by setting the value to be sufficiently smaller, and the results of flow rate and pressure drop in the measurement section and the remaining sections were analyzed using the Levenberg-Marquardt-Algorithm.

[0082] FIG. 8 is a drawing showing the results of measuring the flow rate and pressure drop according to the wall shear rate at the measuring section when the potential pulsation generating section (100) and the rear pulsation generating section (200) are moved at an angular frequency ω0 in a structure in which each of the above-mentioned potential pulsation generating section (100) and the rear pulsation generating section (200) is one.

[0083] Figures 8(1) and 8(2) show the wall shear rate by average flow rate. When =10[1 / s], the wall shear rate ratio The flow rate and pressure drop results are as follows, and Fig. 8(3) and Fig. 8(4) show the wall shear rate by the average flow rate. When =1[1 / s], the wall shear rate ratio The flow rate and pressure drop results are shown.

[0084] Wall shear rate by average flow rate In the case of these sufficiently small figures 8(3) and 8(4), it is measured as a complete sine wave having the same angular frequency ω0 as the angular frequency applied to the above-mentioned potential pulsation generator (100) and the rear pulsation generator (200).

[0085] In the case of Fig. 8(1) and Fig. 8(2) class Although the ratio is the same as in Fig. 8(3) and Fig. 8(4), the solid line with a high wall shear rate due to the average flow rate shows a waveform that is not a perfect sine wave.

[0086] The present invention is a technology for measuring the characteristics of a measurement target material flowing in a pipe (10). The measurement target material must undergo dynamic vibration in a linear section with a small deformation, and must have an angular frequency equal to the angular frequency ω0 applied by the user and be generated in the form of a complete sine wave.

[0087] Therefore, in order to generate a perfect sine wave, the wall shear rate by the average flow rate and wall shear rate ratio This should be limited.

[0088] In the case of Fig. 8(5) and Fig. 8(6), the flow rate and pressure drop results of the measuring unit (300) were analyzed by frequency using FFT (Fast Fourier Transform), and the results were normalized by dividing the maximum value of the amplitude.

[0089] When the ratio of the wall shear rate and the wall shear rate by the average flow rate is sufficiently small, only the angular frequency ω0 applied to the above-mentioned pulsation generating unit (100) and the rear pulsation generating unit (200) is measured as a single angular frequency, and it can be seen that as the wall shear rate increases, the waveform begins to break up and noise is generated at a multiple of the applied frequency.

[0090] Figure 9 is a result of comparing the flow rate according to the wall shear rate in the measuring section and the remaining section when moving at an angular frequency ω0 in a structure in which each of the above-mentioned potential pulsation generating section (100) and the rear pulsation generating section (200) is one.

[0091] In the case of Fig. 9(3) and Fig. 9(4), it can be confirmed that the wall shear rate and the wall shear rate ratio due to the average flow rate are sufficiently small that the pulsation is reduced to the extent that it is not visible in the remaining portion that passes the measuring portion (300) and the rear pulsation generating portion (200), and in the case of Fig. 9(1) and Fig. 9(2) where the wall shear rate due to the average flow rate increases, it can be confirmed that some pulsation remains in the remaining portion.

[0092] Figures 9(5) and 9(6) are the results of performing frequency analysis using FFT (Fast Fourier Transform) on the flow rate and pressure drop results of the remaining portion, and normalizing them by dividing the maximum value of the amplitude.

[0093] For the remaining part, it remains in the form of a multiple of the applied angular frequency ω0, but if the ratio of the wall shear rate due to the average flow rate and the wall shear rate is sufficiently small, its size is very small and can be ignored.

[0094] Fig. 10 is a graph showing the pressure change in the longitudinal direction in the measuring unit (300) at a specific time. Referring to Fig. 10, it can be confirmed that the pressure change in the longitudinal direction increases or decreases linearly. In a structure where each of the above-mentioned potential pulsation generating unit (100) and the rear pulsation generating unit (200) performs a reciprocating motion, a linear pressure change can be generated, which supports the generation of an accurate sine wave.

[0095]

[0096] [Region of affection in a structure in which there is one potential pulsation generating unit (100) and one rear pulsation generating unit (200) applied to the piston and camshaft, respectively]

[0097] Referring to Fig. 11, when the potential pulsation generating unit (100) and the rear pulsation generating unit (200) move at an angular frequency ω0, the material to be measured spreads out or comes in in a fan shape. This means that when the potential pulsation generating unit (100) and the rear pulsation generating unit (200) move, they can affect not only the measuring unit (300) but also the inlet (10a) of the pipe (10), and the influence area of ​​the potential pulsation generating unit (100) and the rear pulsation generating unit (200) can be confirmed through simulation.

[0098] Figure 12 is a simulation result of the influence area by the above-mentioned potential pulsation generating unit (100) and the rear pulsation generating unit (200). The fluctuating flow rate Q measured in the remaining part R Fluctuation flow rate Q measured in the measuring part (300) ε It is expressed as a ratio of , and the influence of the length ratio can be confirmed.

[0099] In this way, it can be confirmed that the influence of the above-mentioned potential pulsation generating unit (100) and the rear pulsation generating unit (200) disappears within 10% of the total length based on the above-mentioned potential pulsation generating unit (100) and the rear pulsation generating unit (200).

[0100]

[0101] [Non-contact: When the potential pulse generator (100) and the rear potential pulse generator (200) are applied as diaphragms, a complete sine wave is generated]

[0102] The non-contact method using the above-mentioned potential pulse generator (100) and the rear potential pulse generator (200) as a diaphragm is described as follows. In the case of the diaphragm, there is a diaphragm in the middle to prevent the measured material from contacting the shaft sealing device, and the measured material is compressed and transported in a non-contact manner by the reciprocating movement of this diaphragm. In this non-contact case, it can be free from foreign substances caused by friction, and can be applied to industries such as secondary batteries, food, and pharmaceuticals.

[0103] Fig. 13 is a simulation drawing of a pipe (10) in which a diaphragm is applied to each of a front pulsation generator (100) and a rear pulsation generator (200). All of the pipes (10) of Fig. 13 used in the simulation have a viscosity The material to be measured flows at a flow rate Q0 in the pipe (10), and various pulsations desired by the user can be generated by the reciprocating motion of the potential pulsation generating unit (100) and the rear pulsation generating unit (200) applied as a diaphragm.

[0104] These are applied as a potential pulsation generator (100) and a rear pulsation generator (200) using a diaphragm, and the flow rate and pressure are measured in the measuring part (300) and the residual part located between the potential pulsation generator (100) and the rear pulsation generator (200). The potential pulsation generator (100) and the rear pulsation generator (200) applied as a diaphragm have opposite phases, and the measuring part (300) can generate a complete sine wave with an angular frequency ω0.

[0105] Even when the above-mentioned potential pulsation generating unit (100) and the rear pulsation generating unit (200) are applied as diaphragms, the wall shear rate by the flow rate is defined as in mathematical equation 3 with the same piping system as described above. Wall shear rate by variable flow rate =0 Wall shear rate by average flow rate A simulation was performed by changing the flow rate and pressure drop results for the measuring section (300) and the remaining sections, and the results were analyzed through the Levenberg-Marquardt-Algorithm.

[0106] Fig. 14 is a graph showing the results of measuring the flow rate and pressure drop according to the wall shear rate at the measuring unit (300) when the angular frequency ω0 moves in a structure in which the above-described potential pulsation generating unit (100) and the rear pulsation generating unit (200) are each applied as one diaphragm. The angular frequency was obtained through the flow rate and pressure drop results and regression analysis, and it can be seen that both the flow rate and the pressure drop are measured as a perfect sine wave with the same angular frequency ω0 as the angular frequency ω0 applied to the above-described potential pulsation generating unit (100) and the rear pulsation generating unit (200).

[0107] Fig. 15 shows the results of measuring the flow rate and pressure drop according to the wall shear rate in the remaining portion when moving at an angular frequency ω0 in a structure in which the above-mentioned potential pulsation generating portion (100) and the rear pulsation generating portion (200) are each applied as one diaphragm. Fig. 16 shows the results of comparing the flow rate results of the measuring portion (300) and the remaining portion. It can be seen that when passing the rear pulsation generating portion (200) that moves in the opposite phase, the existing pulsation in the measuring portion (300) is canceled out and reduced to 1 / 4.

[0108] Fig. 17 is a graph showing the pressure change in the longitudinal direction in the measuring unit (300) at a specific time. It can be confirmed that the pressure change in the longitudinal direction increases or decreases linearly. A pair of the above-mentioned potential pulsation generating unit (100) and the rear pulsation generating unit (200) can generate a linear pressure change by applying a diaphragm, which supports the generation of an accurate sine wave.

[0109]

[0110] [Region of affection in a structure in which there is one potential pulsation generator (100) and one rear pulsation generator (200) applied as a diaphragm]

[0111] Figure 18 is a simulation result of the influence area by the potential pulsation generator (100) and the rear pulsation generator (200) applied as a diaphragm. The fluctuating flow rate Q measured in the remaining part R Fluctuation flow rate Q measured in the measuring part ε It is expressed as a ratio of , and the influence according to the length ratio can be confirmed. It can be confirmed that the influence of the potential pulsation generating unit (100) and the rear pulsation generating unit (200) disappears within 10% of the total length based on each potential pulsation generating unit (100) and the rear pulsation generating unit (200).

[0112]

[0113] [Multi-frequency generation]

[0114] The following describes a method for generating a multi-mode frequency by synthesizing multiple frequencies using a pulsating pump that implements the precise sine wave flow rate of the present invention.

[0115] Fig. 19(a) is a graph showing a single mode which is a single frequency and a complete sine wave, and Fig. 19(b) is a graph showing a multimode in which multiple frequencies are synthesized. In the case of a single mode, it is possible to implement it through a structure in which each of the potential pulsation generator (100) and the rear pulsation generator (200) applied as a piston and cam or diaphragm presented above are configured as one unit, and in the case of a multimode, it is possible to implement it by applying multiple potential pulsation generators (100) and rear pulsation generators (200), respectively.

[0116] For multimode, flow rate Q(t) and pressure drop All frequencies are synthesized by performing FFT (Fast Fourier Transform) i , the magnitude of the frequency component and phase difference δ i, and the storage modulus G′ and loss modulus G″ corresponding to each frequency can be calculated simultaneously using the viscoelastic monitoring technology in the pipe (10) in the same manner as in the single mode.

[0117]

[0118] [Generating the frequency of an arbitrary waveform with a period]

[0119] The following describes a method for generating the frequency of an arbitrary wave, such as that shown in Fig. 20, using a pulsating pump that implements the precise sine wave flow rate of the present invention.

[0120] Fig. 20 is a diagram showing an arbitrary waveform. Not only trapezoidal waves and triangular waves as in Fig. 20, but also arbitrary waveforms with a period such as square waves can be generated relatively easily using a potential pulsation generator (100) having a piston and a camshaft and a rear pulsation generator (200). In one embodiment, the potential pulsation generator (100) and the rear pulsation generator (200) having a piston and a camshaft can be generated by repeatedly moving and stopping in accordance with the trapezoidal waveform of Fig. 20, and the arbitrary waveform can be analyzed using a Fourier series.

[0121] While the present invention has been described with reference to the embodiments illustrated in the drawings, these are merely exemplary, and those skilled in the art will appreciate that various modifications and equivalent alternative embodiments are possible. Therefore, the true scope of technical protection of the present invention should be determined by the technical spirit of the appended claims.

Claims

1. In a pulsating pump that implements an accurate sinusoidal flow rate that generates dynamic vibrations in response to the flow rate when the measured substance flows in the pipe, A potential pulsation generating unit and a rear pulsation generating unit that are sequentially arranged to be spaced apart from each other in the direction of movement of the material to be measured and generate dynamic vibrations in the material to be measured; A measuring unit is disposed between the above-mentioned potential pulse generator and the above-mentioned rear-end pulse generator, and measures the waveform of the material to be measured; A pulsating pump that implements an accurate sine wave flow rate by inducing different dynamic vibrations in the material to be measured while the above-mentioned potential pulsating generator and the above-mentioned rear pulsating generator are driven in opposite directions.

2. In claim 1, A pulsating pump that implements an accurate sine wave flow rate in which the above-mentioned pulsating generation unit and the rear pulsating generation unit are driven to have the same frequency and opposite displacement.

3. In claim 1, The above potential pulsation generating unit is a pulsation pump that implements an accurate sine wave flow rate and is positioned at a position more than 5 times the diameter of the pipe in the direction of movement of the material to be measured from the inlet of the pipe.

4. In claim 1, The above rear pulsation generating unit is a pulsation pump that implements an accurate sine wave flow rate and is positioned at a position that is at least 5 times the diameter of the pipe in the direction of movement of the material to be measured from the measuring unit.

5. In claim 1, The above measuring unit is a pulsating pump that implements an accurate sine wave flow rate, and is positioned at a position that is at least 5 times the diameter of the pipe in the direction of movement of the material to be measured from the potential pulsation generating unit.

6. In claim 1, A pulse pump that implements an accurate sine wave flow rate, wherein the above-mentioned potential pulse generator and the rear-end pulse generator are each provided in multiple numbers so that multiple frequencies are generated when the material to be measured is dynamically vibrated.

7. In claim 6, The above potential pulse generation unit includes a first potential pulse generation means and a second potential pulse generation means that are sequentially arranged to be spaced apart from each other in the direction of movement of the measurement target material, The above rear pulsation generating unit is a pulsation pump that implements an accurate sine wave flow rate, including a first rear pulsation generating means and a second rear pulsation generating means that are sequentially arranged to be spaced apart from each other in the direction of movement of the material to be measured.

8. In claim 7, The first potential pulsation generating means and the second potential pulsation generating means are driven in opposite directions, A pulsating pump that implements an accurate sine wave flow rate by having the second potential pulsating generating means and the first potential pulsating generating means driven in opposite directions.

9. In claim 1, Each of the above potential pulse generator and the above potential pulse generator A piston that is placed in communication with the above pipe and is elastically supported by an elastic member, A camshaft having a cam that reciprocates the piston, and A pulsating pump that implements an accurate sinusoidal flow rate, which is connected to the camshaft and includes a rotary driving means that rotates the camshaft.

10. In claim 9, A pulsating pump that implements an accurate sinusoidal flow rate in which dynamic vibrations occurring in the material to be measured can be changed depending on the number and shape of the lobes of the cam.

11. In claim 1, A pulsating pump that implements an accurate sine wave flow rate, wherein the above-mentioned pulsating generator and the above-mentioned rear pulsating generator are each diaphragms.

12. In claim 11, The above diaphragm is a pulsating pump that implements an accurate sinusoidal flow rate arranged around the perimeter of the above pipe.

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