Filtering method for preparing gynecological cleaning fluid

Abstract

The invention relates to the technical field of gynecological cleaning fluid preparation, in particular to a filtering method for gynecological cleaning fluid preparation, which comprises the following steps: acquiring a particle size distribution curve of impurities in cleaning fluid to determine the particle size distribution condition of the impurities, and determining the distribution mode of a plurality of filter membranes according to the particle size distribution condition; in the corresponding distribution mode, dividing a single filter membrane into a plurality of areas, determining a differential pressure standard deviation of transmembrane differential pressure for the single area, and determining whether the stirring process of the cleaning liquid is qualified or not according to the differential pressure standard deviation so as to adjust the stirring speed of the cleaning liquid or the cross flow rate; and obtaining a plurality of turbidity change rates of each stage of filter membrane to determine whether the aperture setting of the filter membrane is qualified or not, and optimizing the distribution mode of the filter membrane according to the flux attenuation rate based on the unqualified aperture setting. The production efficiency of the cleaning liquid is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of the preparation of gynecological cleaning solutions, and particularly relates to a filtering method for the preparation of gynecological cleaning solutions. Background Art

[0002] In the field of the preparation of gynecological cleaning solutions, the efficiency problem of filtering technology has long restricted the improvement of product quality and production efficiency. In the prior art, traditional filtering methods mainly rely on single-layer filter screens or simple layered structures, resulting in low filtering efficiency and significant technical bottlenecks. For example, in the preparation of traditional Chinese medicine gynecological cleaning solutions, natural precipitation after decoction or single-layer metal filter screen filtering is often used. However, macromolecular impurities such as cellulose and resin in the medicinal liquid easily clog the filter screen, and the filter screen needs to be repeatedly disassembled and washed and refiltered. The single-batch processing time is as long as 4 to 6 hours. More critically, existing devices generally lack a classification filtering mechanism, and solid waste residues and colloidal particles are often mixed in the filtrate, which not only affects the clarity of the product but also causes the loss of active ingredients with impurities. Some enterprises have to adopt secondary treatment processes such as centrifugal separation, increasing the overall energy consumption by more than 30%.

[0003] The insufficient intelligent level of existing filtering systems has also exacerbated the efficiency problem. Most devices use filter screens with fixed pore sizes and cannot dynamically adjust the filtering accuracy according to the viscosity of the medicinal liquid. For example, for heat-clearing and detoxifying cleaning solutions with a higher consistency, the filter screen needs to be frequently replaced, causing production interruptions.

[0004] Chinese Patent Application Publication No.: CN111514648A discloses a filtering device for the production of traditional Chinese medicine gynecological cleaning solutions, including a filtering kettle and a base. The filtering kettle is installed on the base through a fixing frame. The top of the filtering kettle is fixedly connected with a feeding device. The discharging end of the feeding device is communicated with the top of the filtering kettle. The end of the feeding device away from the filtering kettle is fixedly installed on the end of the base away from the fixing frame through a support leg. A coarse filter screen is installed at the inner top of the filtering kettle. A flow guide plate is installed directly below the coarse filter screen. A fine filtering device is installed directly below the flow guide plate. A coaxial reverse driving device is installed at the bottom of the filtering kettle. The lower end of the coaxial reverse driving device is fixedly installed on the base. This filtering device can control the feeding speed and the feeding amount, preliminarily filter the filtrate through the coarse filter screen, and then finely filter the filtrate by the fine filtering device. The filtering ability is improved through the coaxial reverse driving device, and the filter residues on the coarse filter screen and the fine filtering device are scraped off to prevent the filter residues from clogging and accumulating, improving the filtering effect.

[0005] There are also the following problems in the prior art: In the prior art, due to the use of filter membranes with fixed pore sizes, the interception effect on medicinal residues is poor, and it is necessary to filter repeatedly for many times to meet the clarification requirements. Especially for high-viscosity cleaning solutions containing polysaccharides or colloidal components, using filter membranes with fixed pore sizes is more likely to clog the pores of the filter membrane, and it is necessary to stop the machine for cleaning or replace the filter material, resulting in low production efficiency. Summary of the Invention

[0006] To this end, the present invention provides a filtering method for the preparation of a gynecological cleaning solution, which is used to overcome the problem of low production efficiency of the cleaning solution caused by using a filter membrane with a fixed pore size when filtering the cleaning solution in the prior art.

[0007] To achieve the above object, the present invention provides a filtering method for the preparation of a gynecological cleaning solution, including: Obtaining the particle size distribution curve of impurities in the cleaning solution to determine whether the particle size distribution of impurities is concentrated distribution or gentle distribution, so as to determine the distribution pattern of several filter membranes as fixed decreasing pore size under the condition of determining concentrated particle size distribution, or determine the distribution pattern of several filter membranes as dynamically decreasing pore size under the condition of determining gentle particle size distribution; Under the corresponding distribution pattern, dividing a single filter membrane into several regions, determining the standard deviation of the pressure difference of the transmembrane pressure difference for a single region, and determining whether the stirring process of the cleaning solution is qualified according to the standard deviation of the pressure difference, so as to adjust the stirring speed of the cleaning solution or the cross-flow rate according to the volume difference between the maximum value and the minimum value of the deposition volumes of several regions; Obtaining several primary turbidity change rates of the cleaning solution filtered by each stage of the filter membrane before adjustment, and several secondary turbidity change rates of the cleaning solution filtered by each stage of the filter membrane after adjustment, so as to determine whether the pore size setting of the filter membrane is qualified according to the primary turbidity change rate and the secondary turbidity change rate, and optimize the distribution pattern of the filter membrane based on the unqualified pore size setting according to the flux decay rate.

[0008] Further, the process of determining the particle size distribution according to the particle size distribution curve includes: Sequentially determining several slopes of the points of the particle size distribution curve along the horizontal axis direction; Based on several of the slopes, sequentially determining several differences between adjacent slopes and determining the maximum value of several of the differences as the particle size mutation value; Comparing the particle size mutation value with a preset mutation value; Based on the comparison result that the particle size mutation value is greater than the preset mutation value, determining that the particle size distribution of impurities is concentrated distribution; Based on the comparison result that the particle size mutation value is less than or equal to the preset mutation value, determining that the particle size distribution of impurities is gentle distribution.

[0009] Further, the process of determining the distribution pattern of several filter membranes according to the particle size distribution includes: Under the condition of determining that the particle size distribution is concentrated distribution, determining the distribution pattern of the filter membrane as fixed decreasing pore size; Under the condition of determining that the particle size distribution is gentle distribution, determining the distribution pattern of the filter membrane as dynamically decreasing pore size.

[0010] Further, the process of determining whether the stirring process of the cleaning liquid is qualified according to the transmembrane pressure difference includes: Determine a plurality of the transmembrane pressure differences of the filter membrane to calculate the standard deviation of the pressure differences; Compare the standard deviation of the pressure differences with a preset standard deviation; Based on the comparison result that the standard deviation of the pressure differences is greater than the preset standard deviation, the stirring process of the cleaning liquid is unqualified.

[0011] Further, under the condition that the stirring process of the cleaning liquid is determined to be unqualified, the process of determining the deposition volume of a single region and determining the stirring speed of the cleaning liquid based on the volume difference between the maximum value and the minimum value of the deposition volume includes: Compare the volume difference with a preset volume difference; Based on the comparison result that the volume difference is greater than the preset volume difference, determine to adjust the stirring speed of the cleaning liquid; Subtract the volume difference from the preset volume difference to obtain a first difference; Set a plurality of speed adjustment coefficients corresponding to the first difference to increase the stirring speed according to the speed adjustment coefficients.

[0012] Further, under the condition that the stirring process of the cleaning liquid is determined to be unqualified, the process of determining the deposition volume of a single region and determining the cross-flow rate of the cleaning liquid based on the volume difference between the maximum value and the minimum value of the deposition volume includes: Compare the volume difference with a preset volume difference; Based on the comparison result that the volume difference is less than or equal to the preset volume difference, determine to adjust the cross-flow rate of the cleaning liquid; Subtract the volume difference from the preset volume difference to obtain a second difference; Set a plurality of rate adjustment coefficients corresponding to the second difference to increase the cross-flow rate according to the rate adjustment coefficients.

[0013] Further, the process of determining whether the pore size setting of the filter membrane is qualified according to the primary turbidity change rate and the secondary turbidity change rate includes: Compare the primary turbidity change rate with the secondary turbidity change rate; Based on the comparison result that the primary turbidity change rate is greater than or equal to the secondary turbidity change rate, determine that the pore size setting of the filter membrane is unqualified.

[0014] Further, under the condition that the pore size setting of the filter membrane is determined to be unqualified, the process of optimizing the distribution pattern of the dynamically decreasing pore size according to the rejection rate includes: Compare the rejection rate with a preset rejection rate; Determine to decrease the pore size decreasing rate based on the comparison result that the rejection rate is less than the preset rejection rate; Among them, subtract the preset rejection rate from the rejection rate to obtain a rejection difference, and set a number of amplitude optimization coefficients corresponding to the rejection difference, so as to decrease the pore size decreasing rate according to the amplitude optimization coefficients.

[0015] Further, under the condition that it is determined that the pore size setting of the filter membrane is unqualified, the process of optimizing the distribution pattern of the fixed pore size decrease according to the rejection rate includes: Compare the rejection rate with the preset rejection rate; Determine to decrease the pore size decreasing gradient based on the comparison result that the rejection rate is less than the preset rejection rate.

[0016] Further, under the condition that it is determined to decrease the pore size decreasing gradient, determine the particle size of the particles with a preset percentage in the cleaning liquid after filtration is completed. The process of decreasing the pore size decreasing gradient based on the particle size includes: Compare the particle size with the preset particle size; Set a number of gradient adjustment coefficients corresponding to the comparison result, so as to decrease the pore size decreasing gradient according to the gradient adjustment coefficients.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows. The present invention determines whether the distribution of impurities is concentrated or gentle by obtaining the particle size distribution of impurities in the cleaning liquid. If the impurities are concentratedly distributed, a single membrane pore size will cause a dense filter cake layer to quickly form on the membrane surface, resulting in a sharp drop in flux. If a coarser pore size is selected to avoid blockage, the penetration rate of small particles will increase, resulting in the turbidity of the finished product exceeding the standard. If the distribution range of impurities is wide, using a filter membrane with a fixed gradient only covers part of the range, and the penetration rate of small particles is large, requiring multiple filtrations. Moreover, impurities with different particle sizes form a "large particle skeleton + small particle filling" structure on the membrane surface, increasing the cleaning difficulty exponentially. Therefore, according to the concentrated distribution of impurities, a mode of gradually decreasing the pore size of the filter membrane is adopted to gradually narrow the interception range and match the main particle size distribution. According to the gentle distribution of impurities, a mode of dynamically decreasing the pore size of the filter membrane is adopted, using dynamic cross-flow + wide pore size gradient to cover the entire particle size range. Under the condition of determining the distribution mode of the filter membrane, the transmembrane pressure difference on any stage of the filter membrane is statistically analyzed to determine whether the transmembrane pressure differences in each area of the filter membrane are consistent. Uneven distribution of impurities in the cleaning liquid will result in inconsistent transmembrane pressure differences in each area. During the filtration process, impurities with a larger density concentrate on impacting a specific area of the membrane surface, resulting in a sharp drop in local flux. At the same time, uneven distribution of impurities will lead to uneven distribution of deposits, and uneven deposition will accelerate the blockage of membrane pores, increasing the surface roughness of the filter membrane, thereby shortening the service life of the filter membrane. In response to the uneven distribution of impurities, the stirring speed of the cleaning liquid is increased or the cross-flow rate is increased to increase the uniformity of impurity distribution, or the shear force of the cleaning liquid during the filtration process is increased to prevent local deposition of large particles on the filter membrane surface, thereby further improving the production efficiency of the cleaning liquid.

[0018] Furthermore, the present invention determines whether the pore size setting of the filter membrane is qualified by the primary turbidity change rate before adjustment and the secondary turbidity change rate after adjustment. Under the condition that the pore size setting is qualified, increasing the uniformity of impurity distribution in the cleaning liquid will increase the collision frequency between impurity particles, making it easier for the flocculant to wrap the impurity particles to form large-size flocs, thereby accelerating the filtration interception rate. At the same time, evenly distributed impurities can reduce local pore blockage and avoid the formation of a "mud cake layer" on the filter membrane surface. Increasing the cross-flow rate to increase the shear force of the cleaning liquid under the condition of evenly distributed impurities can more effectively inhibit the deposition of pollutants on the membrane surface, helping to maintain a stable filtration flux, thereby further accelerating the filtration interception rate and increasing the turbidity change rate. Under the condition that the pore size setting is unqualified, the pore size of the filter membrane exceeds the critical value of the impurity particle size distribution. Even if the uniformity of impurity distribution in the cleaning liquid is increased or the cross-flow rate of the cleaning liquid is increased, the dynamic membrane will still not be able to effectively intercept impurities of the target particle size, resulting in the secondary turbidity change rate not increasing compared to before adjustment. For the situation where the pore size setting is unqualified, targeted adjustment is carried out according to the rejection rate to further improve the production efficiency of the cleaning liquid.

[0019] Further, under the condition that the pore size setting of the filter membrane is determined to be unqualified, the present invention adjusts the two distribution modes respectively. For the distribution mode of dynamic gradient decrease, the pore size decrease rate is reduced, which can avoid the sudden change of local flow velocity caused by the sudden drop of the pore size, reduce the risk of concentration polarization, delay the deposition of pollutants in the pore size mutation area, and reduce the penetration of small particles. For the distribution mode of fixed decrease, the decrease gradient is reduced to make the minimum pore size more matched with the impurity D90, prevent premature blockage in the area with too small pore size, and reduce the stress concentration between the membrane layers, so as to further improve the production efficiency of the cleaning solution while ensuring the filtration effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a flowchart of the filtration method for preparing gynecological cleaning solution according to an embodiment of the present invention; Figure 2 is a flowchart of determining the particle size distribution according to an embodiment of the present invention; Figure 3 is a flowchart of determining whether the stirring process of the cleaning solution is qualified according to an embodiment of the present invention; Figure 4 is a flowchart of determining whether the pore size setting of the filter membrane is qualified according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In order to make the purpose and advantages of the present invention clearer, the present invention will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention and do not limit the protection scope of the present invention.

[0023] Please refer to Figures 1 - 4 shown Figure 1 is a flowchart of the filtration method for preparing gynecological cleaning solution according to an embodiment of the present invention; Figure 2 is a flowchart of determining the particle size distribution according to an embodiment of the present invention; Figure 3 is a flowchart of determining whether the stirring process of the cleaning solution is qualified according to an embodiment of the present invention; Figure 4 is a flowchart of determining whether the pore size setting of the filter membrane is qualified according to an embodiment of the present invention.

[0024] An embodiment of the present invention provides a filtration method for preparing gynecological cleaning solution, including: Step S1, obtain the particle size distribution curve of impurities in the cleaning liquid to determine whether the particle size distribution of the impurities is concentrated distribution or smooth distribution, and determine the distribution pattern of several filter membranes as fixed decreasing pore size under the condition of determining concentrated particle size distribution, or determine the distribution pattern of several filter membranes as dynamically decreasing pore size under the condition of determining smooth particle size distribution; Step S2, under the corresponding distribution pattern, divide a single filter membrane into several regions, determine the pressure difference standard deviation of the transmembrane pressure difference for a single region, and determine whether the stirring process of the cleaning liquid is qualified according to the pressure difference standard deviation, so as to adjust the stirring speed of the cleaning liquid or the cross-flow rate according to the volume difference between the maximum and minimum deposition volumes of several regions; Step S3, obtain several primary turbidity change rates of the cleaning liquid filtered through each stage of the filter membrane before adjustment, and several secondary turbidity change rates of the cleaning liquid filtered through each stage of the filter membrane after adjustment, so as to determine whether the pore size setting of the filter membrane is qualified according to the primary turbidity change rate and the secondary turbidity change rate, and optimize the distribution pattern of the filter membrane based on the unqualified pore size setting according to the flux decay rate.

[0025] Specifically, the process of determining the particle size distribution according to the particle size distribution curve includes: Sequentially determine several slopes of the points on the particle size distribution curve along the horizontal axis direction; Based on several of the slopes, sequentially determine several differences between adjacent slopes and determine the maximum value of several of the differences as the particle size mutation value; Compare the particle size mutation value with a preset mutation value; Based on the comparison result that the particle size mutation value is greater than the preset mutation value, determine that the particle size distribution of the impurities is concentrated distribution; Based on the comparison result that the particle size mutation value is less than or equal to the preset mutation value, determine that the particle size distribution of the impurities is smooth distribution.

[0026] Specifically, the particle size distribution curve is drawn according to the detection results of a laser particle size analyzer. The specific model of the laser particle size analyzer is not limited, as long as it meets the usage requirements.

[0027] Specifically, the value of the preset mutation value is the average value of several preset mutation values with production efficiency meeting the production requirements during the historical filtration process.

[0028] It can be understood that the slope of the particle size distribution curve reflects the steepness of the particle size distribution. When the slope of the curve increases sharply in a certain particle size range, forming a sharp peak, it indicates that the particle size is highly concentrated; when the slope of the curve changes gently and the distribution range is wide, it indicates that the particle size is dispersed. The maximum value of the difference between adjacent slopes (i.e., the particle size mutation value) corresponds to the inflection point or kurtosis change point of the distribution curve. If the mutation value is significantly higher than the preset threshold, it indicates that there is a steep area in the curve, corresponding to a concentrated distribution; if the mutation value is close to or lower than the threshold, it indicates that the curve is smooth, corresponding to a gentle distribution.

[0029] Specifically, the process of determining the distribution pattern of several filter membranes according to the particle size distribution includes: Under the condition that the particle size distribution is determined to be a concentrated distribution, determine the distribution pattern of the filter membrane as a fixed decreasing pore size; Under the condition that the particle size distribution is determined to be a gentle distribution, determine the distribution pattern of the filter membrane as a dynamically decreasing pore size.

[0030] Specifically, the fixed decreasing pore size means that the pore size decreases with a fixed pore size decreasing gradient. The setting principle of the pore size is: each level of pore size should cover 80% - 90% of the particle size of the remaining impurities after the previous level of interception, forming a gradient interception. For example, for the traditional Chinese medicine gynecological cleaning solution with a concentrated distribution of impurity particle sizes, gradient filtration is carried out, and the pore size is set to decrease by 30μm step by step, specifically as follows: Series Aperture range (μm) First stage 70 Second stage 40 Third stage 10 Fourth stage 2 Specifically, the dynamically decreasing pore size means that the pore size decreases with a fixed pore size decreasing rate. For example, for the traditional Chinese medicine gynecological cleaning solution with a gentle distribution of impurity particle sizes, gradient filtration is carried out, and the pore size is set to decrease by 30% step by step, specifically as follows: Series Aperture range (μm) First stage 70 Second stage 49 Third stage 34 Fourth stage 24 Fifth stage 17 Sixth stage 12 Seventh stage 8 Eighth stage 2 It can be understood that the pore size of the first - stage filter membrane is set according to D90 and is 1.2 times of D90. The pore size of the last - stage filter membrane is determined according to the final filtration requirements, where D90 represents the particle size value corresponding to when the particle size cumulative distribution percentage reaches 90%.

[0031] Specifically, the process of determining whether the stirring process of the cleaning solution is qualified according to the transmembrane pressure difference includes: Determine several of the transmembrane pressure differences of the filter membrane to calculate the pressure difference standard deviation; Compare the pressure difference standard deviation with the preset standard deviation; Based on the comparison result that the pressure difference standard deviation is greater than the preset standard deviation, the stirring process of the cleaning solution is unqualified; Based on the comparison result that the pressure difference standard deviation is less than or equal to the preset standard deviation, the stirring process of the cleaning solution is qualified.

[0032] It is understandable that the area division method of the filter membrane can be carried out according to the shape of the filter membrane. For example, for a circular filter membrane, it can be divided into several concentric circles with equal spacing, and for a rectangular filter membrane, the area can be divided equally, and the specific method is not limited.

[0033] Specifically, the value of the preset standard deviation is the mean of several pressure difference standard deviations with uniform impurity distribution of the cleaning liquid during the historical filtration process. For different filter membrane materials, the value of the preset standard deviation is different. For example, for a ceramic membrane, the value range of the preset standard deviation is [0.05 MPa, 0.1 MPa], and 0.06 MPa is preferably selected in the embodiment of the present invention; for an organic membrane, the value range of the preset standard deviation is [0.01 MPa, 0.03 MPa], and 0.01 MPa is preferably selected in the embodiment of the present invention; for a stainless steel screen, the value range of the preset standard deviation is [0.02 MPa, 0.05 MPa], and 0.03 MPa is preferably selected in the embodiment of the present invention, and the specific value is not limited.

[0034] It is understandable that several transmembrane pressure differences can be measured using, for example, a pressure difference sensor array, and the specific method is not limited.

[0035] Specifically, under the condition that the stirring process of the cleaning liquid is determined to be unqualified, the process of determining the deposited object volume of a single region and determining the stirring speed of the cleaning liquid based on the volume difference between the maximum and minimum values of the deposited object volume includes: Comparing the volume difference with a preset volume difference; Determining to adjust the stirring speed of the cleaning liquid based on the comparison result that the volume difference is greater than the preset volume difference; Subtracting the volume difference from the preset volume difference to obtain a first difference; Setting several speed adjustment coefficients corresponding to the first difference to increase the stirring speed according to the speed adjustment coefficients.

[0036] Specifically, comparing the first difference with a preset difference; Increasing the stirring speed with a first speed adjustment coefficient based on the comparison result that the first difference is greater than the preset difference; Increasing the stirring speed with a second speed adjustment coefficient based on the comparison result that the first difference is less than or equal to the preset difference.

[0037] Specifically, the value of the preset volume difference is the volume difference corresponding to when the pressure difference standard deviation of the transmembrane pressure difference is equal to the preset standard deviation, and the value range is different for cleaning liquids with different viscosities. For example, for a high-viscosity system (viscosity greater than 50 mPa·s), the value range of the preset volume difference is set to [0.8 cm 3 , 1.5 cm 3; For medium- and low-viscosity systems (viscosity range: 1 mPa·s to 50 mPa·s), the value range of the preset volume difference is set to [0.5 cm 3 , 1.0 cm 3 , and no specific limitation is made.

[0038] Specifically, the value range of the preset difference is determined according to the historical filtration process, and the specific setting range is [0.2 cm 3 , 0.5 cm 3 , and 0.3 cm 3 is preferred in the embodiments of the present invention; the value range of the first speed adjustment coefficient is set to [1.2, 1.5], and 1.3 is preferred in the embodiments of the present invention; the value range of the second speed adjustment coefficient is set to [1.05, 1.15], and 1.1 is preferred in the embodiments of the present invention.

[0039] Specifically, under the condition that it is determined that the stirring process of the cleaning liquid is unqualified, determining the deposited object volume of a single area, and the process of determining the cross-flow rate of the cleaning liquid based on the volume difference between the maximum value and the minimum value of the deposited object volume includes: Comparing the volume difference with the preset volume difference; Determining the cross-flow rate of the cleaning liquid based on the comparison result that the volume difference is less than or equal to the preset volume difference; Subtracting the preset volume difference from the volume difference to obtain a second difference; Setting a number of rate adjustment coefficients corresponding to the second difference to increase the cross-flow rate according to the rate adjustment coefficients.

[0040] Specifically, comparing the second difference with the preset difference; Increasing the cross-flow rate with a first rate adjustment coefficient based on the comparison result that the second difference is greater than the preset difference; Increasing the cross-flow rate with a second rate adjustment coefficient based on the comparison result that the second difference is less than or equal to the preset difference.

[0041] It can be understood that the cross-flow rate refers to the shear velocity of the feed liquid flowing parallel to the membrane surface. In the embodiments of the present invention, the cross-flow rate corresponds to different values for different filtration stages. For example, for the large particle removal stage (particle size > 50 μm), high-flow-rate shear flushing is required. The high shear force generated by the high flow rate can prevent large particles such as medicinal material debris from depositing on the membrane surface and prevent membrane surface accumulation. For the colloid (1 - 100 nm) removal stage, a lower flow rate is required to reduce concentration polarization. However, if the flow rate is too low, the deposited matter cannot be effectively carried away, resulting in accumulation on the membrane surface, thus causing uneven distribution of the deposited object volume.

[0042] Specifically, the value range of the first rate adjustment coefficient is set to [1.2, 1.4], and 1.25 is preferred in the embodiments of the present invention; the value range of the second rate adjustment coefficient is set to [1.05, 1.19], and 1.15 is preferred in the embodiments of the present invention.

[0043] Specifically, the process of determining whether the aperture setting of the filter membrane is qualified according to the primary turbidity change rate and the secondary turbidity change rate includes: Compare the primary turbidity change rate with the secondary turbidity change rate; Based on the comparison result that the primary turbidity change rate is greater than or equal to the secondary turbidity change rate, it is determined that the aperture setting of the filter membrane is unqualified; Based on the comparison result that the primary turbidity change rate is less than the secondary turbidity change rate, it is determined that the aperture setting of the filter membrane is qualified.

[0044] It can be understood that the turbidity change rate in the embodiments of the present invention refers to the average decrease rate of the turbidity of the cleaning liquid after passing through each stage of the filter membrane.

[0045] Specifically, under the condition of determining that the aperture setting of the filter membrane is unqualified, the process of optimizing the distribution pattern of the dynamic decreasing aperture according to the rejection rate includes: Compare the rejection rate with the preset rejection rate; Based on the comparison result that the rejection rate is less than the preset rejection rate, it is determined to reduce the aperture decreasing rate; Based on the comparison result that the rejection rate is greater than or equal to the preset rejection rate, it is determined not to optimize the aperture decreasing rate; Wherein, the difference between the preset rejection rate and the rejection rate is used to obtain the rejection difference, and a number of amplitude optimization coefficients corresponding to the rejection difference are set to reduce the aperture decreasing rate according to the amplitude optimization coefficients.

[0046] Specifically, the preset rejection rate is determined according to the filtration requirements, and the value range is [98%, 99.9%], and 99.5% is preferred in the embodiments of the present invention.

[0047] Specifically, compare the rejection difference with the preset rejection difference; Based on the comparison result that the rejection difference is greater than the preset rejection difference, it is determined to reduce the aperture decreasing rate with the first amplitude optimization coefficient; Based on the comparison result that the rejection difference is less than or equal to the preset rejection difference, it is determined to reduce the aperture decreasing rate with the second amplitude optimization coefficient.

[0048] Specifically, the value range of the preset interception difference is set to [0.03%, 0.08%], and 0.05% is preferred in the embodiments of the present invention; the value range of the first amplitude optimization coefficient is set to [0.6, 0.8], and 0.7 is preferred in the embodiments of the present invention; the value range of the second amplitude optimization coefficient is set to [0.81, 0.9], and 0.85 is preferred in the embodiments of the present invention.

[0049] During implementation, for example, the interception rate is 99%, which is less than the preset interception rate and the interception difference is 0.05%. The interception difference is equal to the preset interception difference. It is selected to reduce the pore size decreasing rate by 30% with the second amplitude optimization coefficient of 0.85, that is, the optimized pore size decreasing rate is 25.5%. The optimized pore sizes at all levels are shown in the following table: Series Aperture range (μm) First stage 70 Second stage 52 Third stage 39 Fourth stage 29 Fifth stage 16 Sixth stage 12 Seventh stage 9 Eighth stage 7 Ninth stage 5 Tenth stage 3 Eleventh stage 2 After adjustment, the interception rate is increased from 99% to 99.8%.

[0050] Specifically, under the condition that it is determined that the pore size setting of the filter membrane is unqualified, the process of optimizing the distribution pattern of the dynamic decreasing of the pore size according to the interception rate includes: Comparing the interception rate with the preset interception rate; Determining to reduce the pore size decreasing gradient based on the comparison result that the interception rate is less than the preset interception rate; Determining not to optimize the pore size decreasing gradient based on the comparison result that the interception rate is greater than or equal to the preset interception rate.

[0051] Specifically, under the condition of determining to reduce the pore size decreasing gradient, determining the particle size of the particles with a preset percentage in the cleaning liquid after filtration is completed, and the process of reducing the pore size decreasing gradient based on the particle size includes: Comparing the particle size with the preset particle size; Setting a number of gradient adjustment coefficients corresponding to the comparison results to reduce the pore size decreasing gradient according to the gradient adjustment coefficients.

[0052] Specifically, the preset percentage is 90%, that is, the pore size decreasing gradient is adjusted according to D90.

[0053] Specifically, based on the comparison result that the particle size is greater than the first preset particle size, it is determined to reduce the pore size decreasing gradient with the first gradient adjustment coefficient; Based on the comparison result that the particle size is less than or equal to the first preset particle size and greater than the second preset particle size, it is determined to reduce the pore size decreasing gradient with the second gradient adjustment coefficient; Wherein, the first preset particle size is greater than the second preset particle size.

[0054] Specifically, the preset particle size is determined according to the filtration requirements of the cleaning liquid. The value range of the first preset particle size is [1 μm, 3 μm], and preferably 2 μm in the embodiments of the present invention. The value range of the second preset particle size is set to [0.5 μm, 1.9 μm], and preferably 1 μm in the embodiments of the present invention. The value range of the first gradient adjustment coefficient is set to [0.5, 0.7], and preferably 0.6 in the embodiments of the present invention. The value range of the second gradient adjustment coefficient is set to [0.71, 0.8], and preferably 0.75 in the embodiments of the present invention.

[0055] During implementation, for example, when the particle size is 3 μm, which is larger than the first preset particle size, it is selected to reduce the pore size decreasing gradient of 30 μm with the first gradient adjustment coefficient of 0.6, that is, the adjusted pore size decreasing gradient is 18 μm. The adjusted pore sizes of each stage are shown in the following table: Series Aperture range (μm) First stage 70 Second stage 52 Third stage 34 Fourth stage 16 Fifth stage 2 After adjustment, the value of D90 is reduced from 3 μm to 1 μm.

[0056] It can be understood that even if the pore size of the last-stage filter membrane is 2 μm, under the condition that the pore sizes of each stage of the filter membrane are not set reasonably, the D90 in the filtered cleaning liquid may still be greater than 2 μm. Because the polysaccharides in the traditional Chinese medicine gynecological cleaning liquid are viscous and easily adsorb impurities to form a colloidal suspension, and the colloid has the ability to deform and can carry impurities through the filter membrane by deformation, resulting in the impurity particles in the filtered cleaning liquid being larger than the pore size of the filter membrane.

[0057] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

Claims

1. A filtering method for the preparation of a gynecological cleaning solution, characterized in that, Including: Obtain the particle size distribution curve of impurities in the cleaning liquid to determine whether the particle size distribution of impurities is concentrated distribution or gentle distribution, and determine the distribution pattern of several filter membranes as fixed decreasing pore size under the condition of determining concentrated particle size distribution, or determine the distribution pattern of several filter membranes as dynamically decreasing pore size under the condition of determining gentle particle size distribution; Under the corresponding distribution pattern, divide a single filter membrane into several regions, determine the pressure difference standard deviation of the transmembrane pressure difference for a single region, and determine whether the stirring process of the cleaning liquid is qualified according to the pressure difference standard deviation, so as to adjust the stirring speed of the cleaning liquid or the cross-flow rate according to the volume difference between the maximum and minimum deposition volumes of several regions; Obtain several primary turbidity change rates of the cleaning liquid filtered through each stage of the filter membrane before adjustment, and several secondary turbidity change rates of the cleaning liquid filtered through each stage of the filter membrane after adjustment, so as to determine whether the pore size setting of the filter membrane is qualified according to the primary turbidity change rate and the secondary turbidity change rate, and optimize the distribution pattern of the filter membrane based on the unqualified pore size setting according to the flux decay rate.

2. The filtration method for the preparation of a gynecological cleaning solution according to claim 1, characterized in that The process of determining the particle size distribution according to the particle size distribution curve includes: Successively determine several slopes of the points on the particle size distribution curve along the horizontal axis direction; Based on several of the slopes, successively determine several differences between adjacent slopes and determine the maximum value of several of the differences as the particle size mutation value; Compare the particle size mutation value with a preset mutation value; Based on the comparison result that the particle size mutation value is greater than the preset mutation value, determine that the particle size distribution of impurities is concentrated distribution; Based on the comparison result that the particle size mutation value is less than or equal to the preset mutation value, determine that the particle size distribution of impurities is gentle distribution.

3. The filtration method for the preparation of a gynecological cleaning solution according to claim 2, wherein, The process of determining the distribution pattern of several filter membranes according to the particle size distribution includes: Under the condition of determining that the particle size distribution is concentrated distribution, determine the distribution pattern of the filter membrane as fixed decreasing pore size; Under the condition of determining that the particle size distribution is gentle distribution, determine the distribution pattern of the filter membrane as dynamically decreasing pore size.

4. The filtration method for the preparation of a gynecological cleansing solution according to claim 3, wherein The process of determining whether the stirring process of the cleaning liquid is qualified according to the transmembrane pressure difference includes: Determine several of the transmembrane pressure differences of the filter membrane to calculate the pressure difference standard deviation; Compare the pressure difference standard deviation with a preset standard deviation; Based on the comparison result that the pressure difference standard deviation is greater than the preset standard deviation, the stirring process of the cleaning liquid is unqualified.

5. The filtration method for the preparation of a gynecological cleansing solution according to claim 4, characterized in that, Under the condition of determining that the stirring process of the cleaning liquid is unqualified, determine the deposition volume of a single region, and the process of determining the stirring speed of the cleaning liquid to be adjusted based on the volume difference between the maximum and minimum deposition volumes includes: Compare the volume difference with a preset volume difference; Based on the comparison result that the volume difference is greater than the preset volume difference, determine to adjust the stirring speed of the cleaning liquid; Subtract the volume difference from the preset volume difference to obtain a first difference; Set several speed adjustment coefficients corresponding to the first difference to increase the stirring speed according to the speed adjustment coefficients.

6. The filtration method for the preparation of a gynecological cleaning solution according to claim 4, characterized in that, Under the condition that the stirring process of the cleaning liquid is determined to be unqualified, the process of determining the deposition volume of a single area and determining the cross-flow rate of the cleaning liquid based on the volume difference between the maximum and minimum deposition volumes includes: Comparing the volume difference with a preset volume difference; Determining the cross-flow rate of the cleaning liquid based on the comparison result that the volume difference is less than or equal to the preset volume difference; Subtracting the preset volume difference from the volume difference to obtain a second difference; Setting a number of rate adjustment coefficients corresponding to the second difference to increase the cross-flow rate according to the rate adjustment coefficients.

7. The filtration method for the preparation of a gynecological cleaning solution according to claim 6, characterized in that, The process of determining whether the pore size setting of the filter membrane is qualified according to the primary turbidity change rate and the secondary turbidity change rate includes: Comparing the primary turbidity change rate with the secondary turbidity change rate; Determining that the pore size setting of the filter membrane is unqualified based on the comparison result that the primary turbidity change rate is greater than or equal to the secondary turbidity change rate.

8. The filtration method for the preparation of a gynecological cleansing solution according to claim 7, characterized in that, Under the condition that the pore size setting of the filter membrane is determined to be unqualified, the process of optimizing the distribution pattern of the pore size decreasing dynamically according to the rejection rate includes: Comparing the rejection rate with a preset rejection rate; Determining to reduce the pore size decreasing rate based on the comparison result that the rejection rate is less than the preset rejection rate; Wherein, subtracting the rejection rate from the preset rejection rate to obtain a rejection difference, and setting a number of amplitude optimization coefficients corresponding to the rejection difference to reduce the pore size decreasing rate according to the amplitude optimization coefficients.

9. The filtration method for the preparation of a gynecological cleansing solution according to claim 7, characterized in that, Under the condition that the pore size setting of the filter membrane is determined to be unqualified, the process of optimizing the distribution pattern of the pore size decreasing fixedly according to the rejection rate includes: Comparing the rejection rate with a preset rejection rate; Determining to reduce the pore size decreasing gradient based on the comparison result that the rejection rate is less than the preset rejection rate.

10. The filtration method for the preparation of a gynecological cleansing solution according to claim 9, characterized in that, Under the condition that the pore size decreasing gradient is determined to be reduced, determining the particle size of the particles with a preset percentage in the cleaning liquid after filtration is completed, and reducing the pore size decreasing gradient based on the particle size includes: Comparing the particle size with a preset particle size; Setting a number of gradient adjustment coefficients corresponding to the comparison result to reduce the pore size decreasing gradient according to the gradient adjustment coefficients.

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