Filtering system and control method thereof

Abstract

The invention provides a filtering system and a control method thereof, and relates to the technical field of filtering. The filtering system comprises a control unit, an injection pump, a switching valve, a flocculant liquid storage tank, a first reaction tank, a to-be-filtered stock solution storage tank, a first filter and a first liquid storage tank, the switching valve comprises a valve body and a valve element arranged in the valve body in a sleeved mode, an inlet and a plurality of outlets are formed in the valve body, the injection pump is communicated with the inlet, and the first reaction tank is communicated with the first filter. The first branch pipeline, the second branch pipeline, the third branch pipeline and the fourth branch pipeline are connected to the different outlets respectively, and the control unit can control the valve element to rotate so that the inlet can be communicated with or separated from the different outlets. The flocculating agent liquid storage tank is communicated with the first branch pipeline and is used for storing a flocculating agent; the first reaction tank is communicated with the second branch pipeline; the to-be-filtered stock solution storage tank is communicated with the third branch pipeline; the first filter is communicated with the fourth branch pipeline; the first liquid storage tank is communicated with the first filter and is used for bearing the first solution filtered by the first filter;

Description

Technical Field

[0001] The present disclosure relates to the field of filtering technology, and in particular, to a filtering system and a control method thereof. Background Art

[0002] The main components of dairy products include water, protein, fat, lactose and minerals, as well as other trace components such as phospholipids, vitamins, enzymes, antibiotics, etc. In order to detect the content of antibiotics in dairy products, electrochemical methods can be used for detection. However, the presence of substances such as protein, fat, lactose in dairy products will affect the accuracy of electrochemical detection results, resulting in low accuracy of test results.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] The present disclosure provides a filtering system and a control method thereof, which can filter substances such as protein, fat, lactose, etc. in dairy products and improve the accuracy of electrochemical detection results.

[0005] According to one aspect of the present disclosure, there is provided a filtration system, comprising:

[0006] Control unit and injection pump;

[0007] The switching valve comprises a valve body and a valve core sleeved in the valve body, the valve body is provided with an inlet and a plurality of outlets, the injection pump is connected to the inlet, the first branch pipe, the second branch pipe, the third branch pipe and the fourth branch pipe are respectively connected to different outlets, and the control unit can control the rotation of the valve core to connect or disconnect the inlet with different outlets, so that different branch pipes are opened or closed;

[0008] A flocculant storage tank is connected to the first branch pipeline, the flocculant storage tank is used to store flocculants, and when the first branch pipeline is opened, the injection pump can absorb the flocculants;

[0009] A first reaction tank is connected to the second branch pipe, and when the second branch pipe is opened, the injection pump can inject the flocculant into the first reaction tank;

[0010] a storage tank for the raw liquid to be filtered, which is connected to the third branch pipeline, and is used to store the raw liquid to be filtered; when the third branch pipeline is opened, the injection pump can absorb the raw liquid to be filtered, and when the second branch pipeline is opened, the injection pump can inject the raw liquid to be filtered into the first reaction tank, so that the raw liquid to be filtered reacts with the flocculant to generate a mixed liquid containing a supernatant and flocs;

[0011] a first filter connected to the fourth branch pipe; when the second branch pipe is opened, the injection pump can absorb the mixed liquid, and when the fourth branch pipe is opened, the injection pump can inject the mixed liquid into the first filter;

[0012] The first liquid storage tank is connected to the first filter through a first conduit and is used for storing the first solution filtered by the first filter.

[0013] In an exemplary embodiment of the present disclosure, the filtration system further comprises:

[0014] a fifth branch pipe, a sixth branch pipe, a seventh branch pipe, an eighth branch pipe, a ninth branch pipe and a tenth branch pipe respectively connected to different outlets; the fifth branch pipe is in communication with the first liquid storage tank;

[0015] a second filter connected to the sixth branch pipe; when the fifth branch pipe is opened, the injection pump can absorb the first solution, and when the sixth branch pipe is opened, the injection pump can inject the first solution into the second filter;

[0016] A second liquid storage tank is connected to the second filter through a second conduit and is used to carry the second solution filtered by the second filter; the seventh branch pipeline is connected to the second liquid storage tank;

[0017] a third filter connected to the eighth branch pipe; when the seventh branch pipe is opened, the injection pump can absorb the second solution, and when the eighth branch pipe is opened, the injection pump can inject the second solution into the third filter;

[0018] A third liquid storage tank is connected to the third filter through a third conduit and is used to carry the third solution filtered by the third filter; the ninth branch pipeline is connected to the third liquid storage tank;

[0019] a fourth filter connected to the tenth pipeline; when the ninth branch pipeline is opened, the injection pump can absorb the third solution, and when the tenth branch pipeline is opened, the injection pump can inject the third solution into the fourth filter;

[0020] a fourth liquid storage tank, connected to the fourth filter through a fourth conduit, and used for carrying a fourth solution filtered by the fourth filter;

[0021] The pore sizes of the filter screens of the first filter, the second filter, the third filter and the fourth filter decrease in sequence.

[0022] In an exemplary embodiment of the present disclosure, the filtration system further comprises:

[0023] an eleventh branch pipe, a twelfth branch pipe and a thirteenth branch pipe respectively connected to different outlets; the eleventh branch pipe is connected to the fourth liquid storage tank; when the eleventh branch pipe is opened, the injection pump can absorb the fourth solution;

[0024] The second reaction tank is connected to the twelfth branch pipeline; when the twelfth branch pipeline is opened, the injection pump can inject the fourth solution into the second reaction tank;

[0025] A diluent storage tank is connected to the thirteenth pipeline, and the diluent storage tank is used to store the diluent; when the thirteenth pipeline is opened, the injection pump can absorb the diluent, and when the twelfth pipeline is opened, the injection pump can inject the diluent into the second reaction tank.

[0026] In an exemplary embodiment of the present disclosure, the filtration system further comprises:

[0027] a fourteenth branch pipeline connected to different of the outlets;

[0028] A cleaning agent storage tank is connected to the fourteenth branch pipe, and the cleaning agent storage tank is used to store cleaning agent; when the fourteenth branch pipe is opened, the injection pump can absorb the cleaning agent; when the fourteenth branch pipe is closed and any one of the first branch pipe to the thirteenth branch pipe is opened, the injection pump injects the cleaning agent into the branch pipe in the open state.

[0029] In an exemplary embodiment of the present disclosure, the pore size of the filter screen of the first filter is 6 microns to 10 microns, the pore size of the filter screen of the second filter is 4 microns to 6 microns, the pore size of the filter screen of the third filter is 0.22 microns to 3 microns, and the fourth filter is used to filter greater than or equal to a preset molecular weight, and the preset molecular weight includes 10 kilodaltons to 100 kilodaltons.

[0030] In an exemplary embodiment of the present disclosure, the filtration system further comprises:

[0031] A plurality of liquid level sensors are respectively arranged in the flocculant storage tank, the first reaction tank, the raw liquid storage tank to be filtered, the first storage tank, the second storage tank, the third storage tank, the fourth storage tank, the second reaction tank, the diluent storage tank and the cleaning agent storage tank, and are used to respectively detect the volume values ​​of the liquids in the flocculant storage tank, the first reaction tank, the raw liquid storage tank to be filtered, the first storage tank, the second storage tank, the third storage tank, the fourth storage tank, the second reaction tank, the diluent storage tank and the cleaning agent storage tank;

[0032] The liquid level sensor is connected to the control unit and can transmit the capacity value to the control unit.

[0033] In an exemplary embodiment of the present disclosure, the filtration system further comprises:

[0034] a plurality of pressure sensors, respectively disposed in the first filter, the second filter, the third filter and the fourth filter, for respectively detecting pressure values ​​in the first filter, the second filter, the third filter and the fourth filter;

[0035] The pressure sensor is connected to the control unit and can transmit the pressure value to the control unit.

[0036] In an exemplary embodiment of the present disclosure, the control unit includes a display screen, and the display screen is used to display the capacity value and the pressure value.

[0037] In an exemplary embodiment of the present disclosure, the filtration system further comprises:

[0038] A waste liquid tank, connected to each of the liquid storage tanks and each of the reaction tanks through a drain pipe;

[0039] A plurality of electromagnetic valves are arranged in the drainage pipes in a one-to-one correspondence.

[0040] According to one aspect of the present disclosure, a control method for a filtration system is provided, for controlling any one of the filtration systems described above, the control method comprising:

[0041] The first branch pipeline is opened, and the injection pump sucks the flocculant;

[0042] Closing the first branch pipe, opening the second branch pipe, and injecting the flocculant into the reaction tank;

[0043] The second branch pipeline is closed, the third branch pipeline is opened, and the injection pump draws the raw liquid to be filtered;

[0044] Close the third branch pipe, open the second branch pipe, and inject the raw liquid to be filtered into the reaction tank, so that the raw liquid to be filtered reacts with the flocculant to generate a mixed liquid containing a lower supernatant and floccules;

[0045] After the injection pump absorbs the mixed liquid, the second branch pipe is closed, the fourth branch pipe is opened, and the mixed liquid is injected into the first filter;

[0046] The solution filtered by the first filter is discharged into the first liquid storage tank.

[0047] The filtration system and control method disclosed herein, by introducing a flocculant to react with a dairy sample in the first reaction tank, effectively removes or reduces substances such as protein, fat, lactose, etc. in dairy products that may interfere with the accuracy of electrochemical detection of antibiotics. In the above process, the opening and closing of each branch pipe, as well as the suction and injection actions of the injection pump can be accurately and automatically controlled by the control unit and the switching valve. This automated design not only improves the convenience of operation, but also significantly reduces the errors caused by human operation, ensuring the stability and consistency of the entire filtration process. At the same time, by filtering the mixed solution generated by the reaction through the first filter, the system can further remove flocs and other impurities to obtain a relatively pure first solution, which helps to improve the sensitivity and accuracy of the detection and reduce misjudgments caused by impurity interference.

[0048] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0050] Figure 1 Schematic diagram of a filtration system in an embodiment of the present disclosure.

[0051] Figure 2 It is a schematic diagram of the filtering process of the raw liquid to be filtered in the embodiment of the present disclosure.

[0052] Figure 3 Flow chart of a control method of a filtering system in an embodiment of the present disclosure.

[0053] In the figure: 1, injection pump; 2, switching valve; 3, flocculant reservoir; 4, first reaction tank; 5, raw liquid reservoir to be filtered; 6, first filter; 7, first reservoir; 8, second filter; 9, second reservoir; 10, third filter; 11, third reservoir; 12, fourth filter; 13, fourth reservoir; 14, second reaction tank; 15, diluent reservoir; 16, cleaning agent reservoir; 17, solenoid valve; 18, waste liquid tank; 19, pressure sensor; 20, liquid level sensor; 21, first conduit; 22, second duct; 23, the third duct; 24, the fourth duct; T01, the first branch duct; T02, the second branch duct; T03, the third branch duct; T04, the fourth branch duct; T05, the fifth branch duct; T06, the sixth branch duct; T07, the seventh branch duct; T08, the eighth branch duct; T09, the ninth branch duct; T10, the tenth branch duct; T11, the eleventh branch duct; T12, the twelfth branch duct; T13, the thirteenth branch duct; T14, the fourteenth branch duct; T15, the fifteenth branch duct; T16, the sixteenth branch duct. DETAILED DESCRIPTION

[0054] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0055] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of the illustration to another component, these terms are used in this specification only for convenience, such as according to the orientation of the examples described in the drawings. It is understood that if the device of the illustration is turned upside down, the component described as "upper" will become the component "lower". When a structure is "on" other structures, it may mean that the structure is formed integrally on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

[0056] The terms "a", "an", "the" and "said" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to indicate an open-ended inclusive meaning and mean that there may be additional elements / components / etc. in addition to the listed elements / components / etc. The terms "first", "second" ... "sixteenth" are used only as labels and are not intended to limit the number of their objects.

[0057] The present disclosure provides a filtering system, such as Figure 1 As shown, the filtration system may include a control unit (not shown in the figure), an injection pump 1, a switching valve 2, a flocculant storage tank 3, a first reaction tank 4, a stock solution storage tank 5 to be filtered, a first filter 6 and a first storage tank 7, wherein:

[0058] The switching valve 2 includes a valve body and a valve core sleeved in the valve body. The valve body is provided with an inlet and multiple outlets. The injection pump 1 is connected to the inlet. The first branch pipeline T01, the second branch pipeline T02, the third branch pipeline T03 and the fourth branch pipeline T04 are respectively connected to different outlets. The control unit can control the valve core to rotate so that the inlet is connected or disconnected with different outlets, so that different branch pipelines are opened or closed.

[0059] The flocculant storage tank 3 is connected to the first branch pipe T01. The flocculant storage tank 3 is used to store flocculants. When the first branch pipe T01 is opened, the injection pump 1 can absorb the flocculants.

[0060] The first reaction tank 4 is connected to the second branch pipe T02. When the second branch pipe T02 is opened, the injection pump 1 can inject the flocculant into the first reaction tank 4.

[0061] The stock solution storage tank 5 is connected to the third branch pipeline T03, and the stock solution storage tank 5 is used to store the stock solution to be filtered; when the third branch pipeline T03 is opened, the injection pump 1 can absorb the stock solution to be filtered, and when the second branch pipeline T02 is opened, the injection pump 1 can inject the stock solution to be filtered into the first reaction tank 4, so that the stock solution to be filtered reacts with the flocculant to generate a mixed solution containing a lower clear liquid and flocs;

[0062] The first filter 6 is connected to the fourth branch pipe T04; when the second branch pipe T02 is opened, the injection pump 1 can absorb the mixed liquid, and when the fourth branch pipe T04 is opened, the injection pump 1 can inject the mixed liquid into the first filter 6;

[0063] The first liquid storage tank 7 is connected to the first filter 6 through the first conduit 21 and is used for carrying the first solution filtered by the first filter 6 .

[0064] The filtration system disclosed in the present invention effectively removes or reduces substances such as protein, fat, lactose, etc. in dairy products that may interfere with the accuracy of electrochemical detection of antibiotics by introducing flocculants to react with dairy samples in the first reaction tank 4. In the above process, the opening and closing of each branch pipe, as well as the suction and injection actions of the injection pump 1 can be accurately and automatically controlled by the control unit and the switching valve 2. This automated design not only improves the convenience of operation, but also significantly reduces the errors caused by human operation, ensuring the stability and consistency of the entire filtration process. At the same time, by filtering the mixed solution generated by the reaction through the first filter 6, the system can further remove flocs and other impurities to obtain a relatively pure first solution, which helps to improve the sensitivity and accuracy of the detection and reduce misjudgments caused by impurity interference.

[0065] The following is a detailed description of each part of the filtration system in the embodiment of the present disclosure:

[0066] The control unit may include a host computer and a microcontroller, wherein the host computer is mainly responsible for data processing, issuing control instructions, and monitoring and management of the system; the microcontroller is responsible for specific control and monitoring tasks, and can interact with external devices through signals.

[0067] The injection pump 1 can be an electronic injection pump. Figure 1 As shown, the injection pump 1 can be connected to the switching valve 2 through the main pipeline. The main pipeline can be made of corrosion-resistant and high-pressure resistant materials, for example, stainless steel or plastic, etc., to ensure long-term reliability and stability. The inner diameter and wall thickness of the main pipeline are accurately calculated to match the flow and pressure requirements of the injection pump 1.

[0068] The main pipeline can serve as a bridge between the injection pump 1 and various processing units (such as filters, reaction tanks, liquid storage tanks, etc.) to ensure that the liquid can flow along a predetermined path. The connection between the injection pump 1 and the main pipeline usually adopts a quick connector or threaded connection with good sealing performance to ensure that there is no leakage during the liquid transmission process and to facilitate quick disassembly and maintenance.

[0069] The switching valve 2 may include a valve body and a valve core sleeved in the valve body. The valve body may be annular and provided with an inlet and multiple outlets distributed along the circumferential direction, wherein the injection pump 1 may be connected to the inlet. The first branch pipeline T01, the second branch pipeline T02, the third branch pipeline T03 and the fourth branch pipeline T04 are respectively connected to different outlets. The control unit can control the rotation of the valve core to connect or disconnect the inlet with different outlets, thereby opening or closing different branch pipelines.

[0070] For example, the valve core is provided with two interconnected first notches and second notches, wherein the first notch is connected to the inlet on the valve body; during the rotation of the valve core, the second notch can be rotated to different outlets, thereby opening different outlets (only one outlet is opened at a time, the other outlets are closed, and the first notch always exposes the inlet on the valve core), at this time, the branch pipe corresponding to the outlet is connected to the inlet, thereby making the branch pipe corresponding to the outlet connected to the injection pump 1.

[0071] For example, when the second notch is rotated to the outlet connected to the first branch pipeline T01, the first branch pipeline T01 is opened, and the second branch pipeline T02, the third branch pipeline T03 and the fourth branch pipeline T04 are closed. At this time, the first branch pipeline T01 is connected to the injection pump 1; when the second notch is rotated to the outlet connected to the second branch pipeline T02, the second branch pipeline T02 is opened, and the first branch pipeline T01, the third branch pipeline T03 and the fourth branch pipeline T04 are closed. At this time, the second branch pipeline T02 is connected to the injection pump 1; when the second notch is rotated to the outlet connected to the third branch pipeline T03, the third branch pipeline T03 is opened, and the first branch pipeline T01, the second branch pipeline T02 and the fourth branch pipeline T04 are closed. At this time, the third branch pipeline T03 is connected to the injection pump 1; when the second notch is rotated to the outlet connected to the fourth branch pipeline T04, the fourth branch pipeline T04 is opened, and the first branch pipeline T01, the second branch pipeline T02 and the third branch pipeline T03 are closed. At this time, the fourth branch pipeline T04 is connected to the injection pump 1.

[0072] In the present disclosure, the materials of the first branch pipeline T01, the second branch pipeline T02, the third branch pipeline T03 and the fourth branch pipeline T04 may also be corrosion-resistant and high-pressure resistant materials, for example, the materials may be stainless steel or plastic, etc. No special limitation is made to the materials of the first branch pipeline T01, the second branch pipeline T02, the third branch pipeline T03 and the fourth branch pipeline T04.

[0073] The flocculant storage tank 3 can be used as a container to store flocculants. The flocculant storage tank 3 can include a tank body and a sealing cover. The tank body can be made of corrosion-resistant materials, such as stainless steel or polyethylene, to ensure that the long-term storage of the flocculant will not cause corrosion to it. The sealing cover is sealed with the tank body to prevent the flocculant from deteriorating.

[0074] The flocculant storage tank 3 can be connected to the end of the first branch pipe T01 away from the switching valve 2. When the first branch pipe T01 is opened, the injection pump 1 is connected to the flocculant storage tank 3 through the main pipe, the switching valve 2 and the first branch pipe T01, and the control unit can control the injection pump 1 to absorb the flocculant in the flocculant storage tank 3.

[0075] The first reaction tank 4 can be connected to the second branch pipe T02; when the second branch pipe T02 is opened, the injection pump 1 is connected to the first reaction tank 4 through the main pipe, the switching valve 2 and the second branch pipe T02, and the control unit can control the injection pump 1 to inject the flocculant into the first reaction tank 4. The first reaction tank 4 can be made of corrosion-resistant materials to ensure that it will not be corroded by the flocculant or other chemicals during the chemical reaction process.

[0076] The stock liquid storage tank 5 for filtering can be used to store the stock liquid to be filtered, and the stock liquid storage tank 5 for filtering can be connected with the third branch pipe T03; when the third branch pipe T03 is opened, the injection pump 1 is connected with the stock liquid storage tank 5 for filtering through the main pipe, the switching valve 2 and the third branch pipe T03, and the control unit can control the injection pump 1 to absorb the stock liquid to be filtered, and then control the switching valve 2 to close the third branch pipe T03 and open the second branch pipe T02, and the injection pump 1 injects the stock liquid to be filtered into the first reaction tank 4, so that the stock liquid to be filtered and the flocculant undergo a flocculation reaction to generate a mixed liquid containing a supernatant and flocs.

[0077] In some embodiments of the present disclosure, a heating device may be provided in the first reaction tank 4, and the injection pump 1 may inject the raw solution to be filtered into the first reaction tank 4 in small amounts and multiple times. After the flocculant and the raw solution to be filtered are injected, the heating device may be started to accelerate the flocculation reaction.

[0078] The first filter 6 can be connected to the fourth branch pipeline T04. When the second branch pipeline T02 is opened, the injection pump 1 can absorb the mixed liquid in the first reaction tank 4. When the mixed liquid is successfully extracted, the control unit controls the switching valve 2 to close the second branch pipeline T02 to prevent the mixed liquid from flowing back; open the fourth branch pipeline T04. At this time, the control unit can control the injection pump 1 to inject the mixed liquid into the first filter 6 at a certain pressure and flow rate. A filter screen is provided in the first filter 6, and the mixed liquid can be filtered through the filter screen in the first filter 6 to remove floccules and macromolecules in the mixed liquid. It should be noted that the pore size of the filter screen can be reasonably set to control the substances filtered out and the substances remaining in the solution.

[0079] Please continue to see Figure 1 As shown, the first liquid storage tank 7 can be connected to the first filter 6 through the first conduit 21, and the first solution formed after filtering by the first filter 6 can be stored in the first liquid storage tank 7. Compared with the original solution to be filtered, the first solution removes substances that affect the accuracy of the electrochemical detection results through processes such as flocculation and filtration, which helps to improve the accuracy of the electrochemical detection results. Taking milk as an example, the protein, fat, lactose and other substances in the milk can be removed through flocculation and filtration, and the remaining components will not affect the electrochemical detection results.

[0080] In an exemplary embodiment of the present disclosure, the filtration system may further include a fifth branch pipeline T05, a sixth branch pipeline T06, a seventh branch pipeline T07, an eighth branch pipeline T08, a ninth branch pipeline T09 and a tenth branch pipeline T10 respectively connected to different outlets. For example, the number of outlets in the switching valve 2 may be 10, and the 10 outlets may be respectively connected to different branch pipelines. For the convenience of distinction, the different branch pipelines may be numbered. For example, the 10 branch pipelines may be named as the first branch pipeline T01, the second branch pipeline T02, the third branch pipeline T03, ..., the ninth branch pipeline T09 and the tenth pipeline T10 in sequence. Among them, the first branch pipeline T01 is connected to the flocculant storage tank 3, the second branch pipeline T02 is connected to the first reaction tank 4, the third branch pipeline T03 is connected to the raw liquid storage tank 5 to be filtered, the fourth branch pipeline T04 is connected to the first filter 6, and the fifth branch pipeline T05 is connected to the first storage tank 7.

[0081] In some embodiments of the present disclosure, the filtration system of the present disclosure may further include a second filter 8, a second liquid storage tank 9, a third filter 10, a third liquid storage tank 11, a fourth filter 12 and a fourth liquid storage tank 13, wherein:

[0082] The second filter 8 can be connected to the sixth branch pipe T06, and the second filter 8 can be used as the second station for the filtration of the mixed solution. When the fifth branch pipe T05 is opened, the injection pump 1 is started to extract the first solution obtained after filtering by the first filter 6 from the first liquid storage tank 7. Subsequently, the switching valve 2 can be controlled by the control unit to close the fifth branch pipe T05, and at the same time, the sixth branch pipe T06 is opened. At this time, the injection pump 1 can accurately inject the first solution into the second filter 8 through the sixth branch pipe T06. The second filter 8 is equipped with a filter screen with a specific pore size, which can effectively intercept and remove larger particles or impurities in the first solution, thereby obtaining a preliminarily purified second solution. The pore size of the filter screen of the second filter 8 can be smaller than the pore size of the filter screen of the first filter 6. The second filter 8 can further remove tiny particles in the first solution to obtain a purer second solution.

[0083] For example, the pore size of the filter screen of the first filter 6 is 6 microns to 10 microns; the pore size of the filter screen of the second filter 8 can be 4 microns to 6 microns. For example, the pore size of the filter screen of the first filter 6 can be 6 microns, and the pore size of the filter screen of the second filter 8 can be 4 microns; the pore size of the filter screen of the first filter 6 can be 7 microns, and the pore size of the filter screen of the second filter 8 can be 4.5 microns; the pore size of the filter screen of the first filter 6 can be 8 microns, and the pore size of the filter screen of the second filter 8 can be 5 microns; the pore size of the filter screen of the first filter 6 can be 9 microns, and the pore size of the filter screen of the second filter 8 can be 5.5 microns; the pore size of the filter screen of the first filter 6 can be 10 microns, and the pore size of the filter screen of the second filter 8 can be 6 microns. Of course, the pore size of the filter screens of the first filter 6 and the second filter 8 can also be other values, which are not listed here one by one.

[0084] The second liquid reservoir 9 can be connected to the second filter 8 through the second conduit 22, and the second liquid reservoir 9 is used to carry the second solution formed after filtering by the second filter 8; the seventh branch pipe T07 can be connected to the second liquid reservoir 9. The second liquid reservoir 9 not only provides a stable fluid supply for the subsequent filtering steps, but also provides a path for the injection pump 1 to absorb the second solution through the seventh branch pipe T07 connected thereto.

[0085] The third filter 10 can be connected to the eighth branch pipe T08, and the third filter 10 can be used as the third station for the mixed solution filtration. When the seventh branch pipe T07 is opened, the injection pump 1 is started again to extract the second solution in the second liquid storage tank 9. At this time, the control unit can control the switching valve 2 to close the seventh branch pipe T07, and at the same time, open the eighth branch pipe T08. At this time, the injection pump 1 can inject the second solution into the third filter 10 through the eighth branch pipe T08. The pore size of the filter screen of the third filter 10 can be smaller than the pore size of the filter screen of the second filter 8. The third filter 10 can further remove tiny particles in the second solution to obtain a purer third solution.

[0086] For example, the pore size of the filter screen of the third filter 10 is 0.22 microns to 3 microns. For example, the pore size of the filter screen of the third filter 10 can be 0.22 microns, 0.5 microns, 1 micron, 1.5 microns, 2 microns, 2.5 microns or 3 microns. Of course, the pore size of the filter screen of the third filter 10 can also be other values, which are not listed here one by one.

[0087] The third liquid reservoir 11 can be connected to the third filter 10 through the third conduit 23, and the third liquid reservoir 11 is used to carry the third solution formed after filtering by the third filter 10; the ninth branch pipe T09 can be connected to the third liquid reservoir 11. The third liquid reservoir 11 not only provides a stable fluid supply for the subsequent filtering steps, but also provides a path for the syringe pump 1 to absorb the third solution through the ninth branch pipe T09 connected thereto.

[0088] The fourth filter 12 can be connected to the tenth pipeline T10, and the fourth filter 12 can be used as the fourth station for the filtration of the mixed solution. When the ninth branch pipeline T09 is opened, the injection pump 1 is started again to extract the third solution in the third liquid storage tank 11. At this time, the control unit can control the switching valve 2 to close the ninth branch pipeline T09, and at the same time, open the tenth pipeline T10. At this time, the injection pump 1 can inject the third solution into the fourth filter 12 through the tenth pipeline T10. The pore size of the filter screen of the fourth filter 12 can be smaller than the pore size of the filter screen of the third filter 10 (that is, the pore sizes of the filter screens of the first filter 6, the second filter 8, the third filter 10 and the fourth filter 12 are reduced in sequence), and the fourth filter 12 can further remove tiny particles in the third solution to obtain a purer fourth solution.

[0089] For example, the fourth filter 12 can be used to filter a molecular weight greater than or equal to a preset molecular weight, and the preset molecular weight can include 10 kilodaltons to 100 kilodaltons; for example, the fourth filter 12 can be used to filter a molecular weight greater than or equal to 10 kilodaltons, that is, the fourth filter can filter out molecular structures with a molecular weight greater than or equal to 10 kilodaltons, while retaining molecular structures with a molecular weight less than 10 kilodaltons; or, the fourth filter 12 can be used to filter a molecular weight greater than or equal to 50 kilodaltons, that is, the fourth filter can filter out molecular structures with a molecular weight greater than or equal to 50 kilodaltons, while retaining molecular structures with a molecular weight less than 50 kilodaltons; or, the fourth filter 12 can be used to filter a molecular weight greater than or equal to 100 kilodaltons, that is, the fourth filter can filter out molecular structures with a molecular weight greater than or equal to 100 kilodaltons, while retaining molecular structures with a molecular weight less than 100 kilodaltons; of course, the fourth filter 12 can also be used to filter molecular structures of other molecular weights, which are not listed here one by one.

[0090] The fourth liquid storage tank 13 may be in communication with the fourth filter 12 via a fourth conduit 24 , and the fourth liquid storage tank 13 is used for carrying a fourth solution formed after filtering by the fourth filter 12 .

[0091] The fourth liquid storage tank 13 can be connected to the fourth filter 12 through the fourth conduit 24, and is used to carry the fourth solution filtered by the fourth filter 12; compared with the original solution to be filtered, the fourth solution effectively removes substances that affect the accuracy of the electrochemical detection results through processes such as flocculation and multi-layer filtration, which helps to improve the accuracy of the electrochemical detection results. Taking milk as an example, the original solution to be filtered can remove substances such as protein, fat, lactose, etc. in the milk through flocculation and quadruple filtration, and the remaining components will not affect the electrochemical detection results. The accuracy of the electrochemical detection results is higher when the solution is used as the detection solution.

[0092] In an exemplary embodiment of the present disclosure, the filtration system may further include an eleventh branch pipe T11, a twelfth branch pipe T12, and a thirteenth branch pipe T13 respectively connected to different outlets. For example, the number of outlets in the switching valve 2 may be 13, and the 13 outlets may be respectively connected to different branch pipes. For the convenience of distinction, the different branch pipes may be numbered. For example, the 13 branch pipes may be named as the first branch pipe T01, the second branch pipe T02, the third branch pipe T03, ..., the twelfth branch pipe T12, and the thirteenth branch pipe T13 in sequence. Among them, the connection method of the first branch pipe T01, the second branch pipe T02, ..., the tenth branch pipe T10 and other branch pipes may refer to the above embodiment, and will not be repeated here. The eleventh branch pipe T11 is connected to the fourth liquid storage tank 13; when the control unit controls the switching valve 2 to open the eleventh branch pipe T11, the injection pump 1 can absorb the fourth solution.

[0093] In some embodiments of the present disclosure, the filtration system of the present disclosure may further include a second reaction tank 14 and a diluent storage tank 15, wherein:

[0094] The second reaction tank 14 can be connected to the twelfth branch pipe T12; when the twelfth branch pipe T12 is opened, the control unit can control the injection pump 1 to inject the fourth solution into the second reaction tank 14. The second reaction tank 14 can be made of corrosion-resistant material to ensure that it will not be damaged by diluents or other substances in subsequent processes.

[0095] The diluent reservoir 15 can be used to store the diluent, and the diluent reservoir 15 can be connected to the thirteenth branch pipe T13. When the thirteenth branch pipe T13 is opened, the control unit can control the injection pump 1 to absorb the diluent, and when the thirteenth branch pipe T13 is closed, the twelfth branch pipe T12 can be opened. At this time, the control unit can control the injection pump 1 to inject the diluent into the second reaction tank 14 to dilute the fourth solution, thereby forming a solution to be detected.

[0096] In an exemplary embodiment of the present disclosure, the filtration system further includes a fourteenth branch pipe T14 connected to different outlets and a cleaning agent storage tank 16, that is, the number of outlets on the switching valve 2 can be 14, and the 14 branch pipes are respectively connected to different outlets. The connection relationship of the first thirteen branch pipes can refer to the above embodiment. The fourteenth branch pipe T14 is connected to the cleaning agent storage tank 16, and the cleaning agent storage tank 16 can be used to store cleaning agents. When it is necessary to clean any branch pipe or a storage tank or reaction tank corresponding to any branch pipe, the control unit can control the switching valve 2 to open the fourteenth branch pipe T14 (at this time, all other branch pipes are closed), and the control unit controls the injection pump 1 to absorb the cleaning agent; then the control unit controls the fourteenth branch pipe T14 to close, and opens the branch pipe to be cleaned, and the injection pump 1 injects the cleaning agent into the branch pipe in the open state. That is, when the fourteenth branch pipe T14 is closed, and any one of the first branch pipe T01 to the thirteenth branch pipe T13 is opened, the injection pump 1 injects the cleaning agent into the branch pipe in the open state.

[0097] In an exemplary embodiment of the present disclosure, please continue to refer to Figure 1 As shown, the filtration system may further include a waste liquid tank 18 and a plurality of solenoid valves 17, wherein:

[0098] The waste liquid tank 18 is connected to each storage tank and each reaction tank through a drainage pipe. That is, the bottoms of the flocculant storage tank 3, the first reaction tank 4, the to-be-filtered raw liquid storage tank 5, the first storage tank 7, the second storage tank 9, the third storage tank 11, the fourth storage tank 13, the second reaction tank 14, the diluent storage tank 15 and the cleaning agent storage tank 16 are respectively connected with drainage pipes, and the ends of the drainage pipes away from each storage tank or reaction tank are connected to the waste liquid tank 18. At least one solenoid valve 17 can be provided in each drainage pipe in a one-to-one correspondence. When it is necessary to discharge the solution in each storage tank or reaction tank, the solenoid valve 17 corresponding to the tank can be opened, so that the waste liquid inside it is discharged to the waste liquid tank 18. For example, after cleaning each storage tank or reaction tank, the solenoid valve 17 at the bottom of the storage tank or reaction tank can be opened to discharge the waste liquid to the waste liquid tank 18.

[0099] In an exemplary embodiment of the present disclosure, the filtering system may further include a fifteenth branch pipe T15 and a sixteenth branch pipe T16, that is, there may be 16 outlets on the switching valve 2, and different branch pipes are connected to different outlets, wherein one end of the fifteenth branch pipe T15 away from the switching valve 2 is connected to the air, and during the filtering process of any one of the first filter 6, the second filter 8, the third filter 10 or the fourth filter 12, sufficient air pressure is required to ensure the normal filtration of the liquid, that is, during the process of the first filter 6, the second filter 8, the third filter 10 or the fourth filter 12, the fifteenth branch pipe T15 can be opened by the switching valve 2, and the injection pump 1 will discharge the filled air into the first filter 6, the second filter 8, the third filter 10 or the fourth filter 12 through the fourth branch pipe T04, the sixth branch pipe T06, the eighth branch pipe T08 or the tenth branch pipe T10, thereby providing sufficient pressure for the filtering process of the first filter 6, the second filter 8, the third filter 10 or the fourth filter 12 to filter out the liquid.

[0100] One end of the sixteenth branch pipe T16 away from the switching valve 2 is connected to the waste liquid pool 18. In the present disclosure, after each liquid passes through the injection pump 1, the injection pump 1 needs to be cleaned. During the cleaning process of the injection pump 1, the fourteenth branch pipe T14 can be opened, and the injection pump 1 sucks the cleaning agent into the injection pump 1 through the fourteenth branch pipe T14. The switching valve 2 closes the fourteenth branch pipe T14 and opens the sixteenth branch pipe T16, and the cleaned liquid is discharged to the waste liquid pool 18 through the sixteenth branch pipe T16.

[0101] In an exemplary embodiment of the present disclosure, the filtration system may further include a plurality of liquid level sensors 20, which are respectively arranged in the flocculant reservoir 3, the first reaction tank 4, the raw liquid reservoir 5 to be filtered, the first reservoir 7, the second reservoir 9, the third reservoir 11, the fourth reservoir 13, the second reaction tank 14, the diluent reservoir 15 and the cleaning agent reservoir 16, and the plurality of liquid level sensors 20 can be used to respectively detect the volume value of the liquid in the flocculant reservoir 3, the first reaction tank 4, the raw liquid reservoir 5 to be filtered, the first reservoir 7, the second reservoir 9, the third reservoir 11, the fourth reservoir 13, the second reaction tank 14, the diluent reservoir 15 and the cleaning agent reservoir 16 in real time to ensure that the volume of the liquid in the pool is maintained within a preset range. The liquid level sensor 20 can be arranged on the side wall or the bottom of the pool body matched therewith so as to accurately measure the height. Each liquid level sensor 20 can be connected to the control unit and can transmit the volume value detected by it to the control unit.

[0102] In an exemplary embodiment of the present disclosure, the filtration system may further include a plurality of pressure sensors 19, which may be respectively disposed in the first filter 6, the second filter 8, the third filter 10, and the fourth filter 12. The plurality of pressure sensors 19 may be used to respectively detect the pressure values ​​in the first filter 6, the second filter 8, the third filter 10, and the fourth filter 12 in real time to ensure that the pressures in the first filter 6, the second filter 8, the third filter 10, and the fourth filter 12 are maintained within a preset range. Each pressure sensor 19 may be connected to the control unit and may transmit the pressure value to the control unit.

[0103] In an exemplary embodiment of the present disclosure, the control unit may further include a display screen, which may be used to display the capacity value detected by each liquid level sensor 20 or the pressure value detected by each pressure sensor 19, and when the capacity value or the pressure value exceeds the corresponding range, the display screen may display an alarm message to remind the staff to handle it in time.

[0104] Combine the following Figure 1 and Figure 2 , briefly explain the working process of the filtration system disclosed in the present invention:

[0105] The control unit controls the switching valve 2 to open the first branch pipe T01. At this time, the injection pump 1 is connected to the flocculant storage tank 3 through the main pipe and the first branch pipe T01; the control unit controls the injection pump 1 to absorb a certain amount of flocculant; the control unit controls the switching valve 2 to close the first branch pipe T01 and open the second branch pipe T02. At this time, the injection pump 1 is connected to the first reaction tank 4 through the main pipe and the second branch pipe T02, and the control unit controls the injection pump 1 to inject the absorbed flocculant into the first reaction tank 4.

[0106] The control unit controls the switching valve 2 to close the second branch pipe T02 and open the third branch pipe T03. At this time, the injection pump 1 is connected to the stock liquid storage tank 5 to be filtered through the main pipe and the third branch pipe T03, and the control unit controls the injection pump 1 to absorb a preset amount of stock liquid to be filtered; the control unit controls the switching valve 2 to close the third branch pipe T03 and open the second branch pipe T02. At this time, the injection pump 1 is connected to the first reaction tank 4 through the main pipe and the second branch pipe T02, and the control unit controls the injection pump 1 to inject the absorbed stock liquid to be filtered into the first reaction tank 4, and the stock liquid to be filtered and the flocculant are mixed in the first reaction tank 4 according to a preset ratio.

[0107] After waiting for 5 minutes, the mixed solution flocculates, and then forms a mixed solution containing a lower clear liquid and flocs. The flocs float up, and the lower clear liquid is located in the lower layer of the flocs. The control unit controls the injection pump 1 to absorb the mixed solution in the first reaction tank 4; the control unit controls the switching valve 2 to close the second branch pipe T02 and open the fourth branch pipe T04. At this time, the injection pump 1 is connected to the first filter 6 through the main pipe and the fourth branch pipe T04. The control unit controls the injection pump 1 to inject the absorbed mixed solution into the first filter 6. After filtering by the first filter 6, the first solution formed after filtration can be discharged into the first liquid storage tank 7 through the first conduit 21.

[0108] The control unit controls the switching valve 2 to close the fourth branch pipe T04 and open the fifth branch pipe T05. At this time, the injection pump 1 is connected to the first liquid storage tank 7 through the main pipe and the fifth branch pipe T05, and the control unit controls the injection pump 1 to absorb the first solution in the first liquid storage tank 7; the control unit controls the switching valve 2 to close the fifth branch pipe T05 and open the sixth branch pipe T06. At this time, the injection pump 1 is connected to the second filter 8 through the main pipe and the sixth branch pipe T06. The control unit controls the injection pump 1 to inject the absorbed first solution into the second filter 8. After filtering by the second filter 8, the second solution formed after filtration can be discharged into the second liquid storage tank 9 through the second conduit 22.

[0109] The control unit controls the switching valve 2 to close the sixth branch pipe T06 and open the seventh branch pipe T07. At this time, the injection pump 1 is connected to the second liquid storage tank 9 through the main pipe and the seventh branch pipe T07, and the control unit controls the injection pump 1 to absorb the second solution in the second liquid storage tank 9; the control unit controls the switching valve 2 to close the seventh branch pipe T07 and open the eighth branch pipe T08. At this time, the injection pump 1 is connected to the third filter 10 through the main pipe and the eighth branch pipe T08. The control unit controls the injection pump 1 to inject the absorbed second solution into the third filter 10. After filtering by the third filter 10, the third solution formed after filtration can be discharged into the third liquid storage tank 11 through the third conduit 23.

[0110] The control unit controls the switching valve 2 to close the eighth branch pipe T08 and open the ninth branch pipe T09. At this time, the injection pump 1 is connected to the third liquid storage tank 11 through the main pipe and the ninth branch pipe T09, and the control unit controls the injection pump 1 to absorb the third solution in the third liquid storage tank 11; the control unit controls the switching valve 2 to close the ninth branch pipe T09 and open the tenth pipe T10. At this time, the injection pump 1 is connected to the fourth filter 12 through the main pipe and the tenth pipe T10. The control unit controls the injection pump 1 to inject the absorbed third solution into the fourth filter 12. After filtering by the fourth filter 12, the fourth solution formed after filtration can be discharged into the fourth liquid storage tank 13 through the fourth conduit 24.

[0111] It should be noted that after the mixed solution passes through the first filter 6, the second filter 8 and the third filter 10 in sequence, the solution becomes clearer. At this time, substances such as large molecular proteins and lactose in the mixed solution are filtered out, and a clear third solution is obtained. The third solution passes through the fourth filter 12 to obtain a fourth solution. The substances in the fourth solution basically do not affect the results of electrochemical detection.

[0112] The control unit controls the switching valve 2 to close the tenth branch pipeline T10 and open the eleventh branch pipeline T11. At this time, the injection pump 1 is connected to the fourth liquid storage tank 13 through the main pipeline and the eleventh branch pipeline T11, and the control unit controls the injection pump 1 to absorb the fourth solution in the fourth liquid storage tank 13; the control unit controls the switching valve 2 to close the eleventh branch pipeline T11 and open the twelfth branch pipeline T12. At this time, the injection pump 1 is connected to the second reaction tank 14 through the main pipeline and the twelfth branch pipeline T12, and the control unit controls the injection pump 1 to inject the absorbed fourth solution into the second reaction tank 14.

[0113] The control unit controls the switching valve 2 to close the twelfth branch pipe T12 and open the thirteenth branch pipe T13. At this time, the injection pump 1 is connected with the diluent storage tank 15 through the main pipe and the thirteenth branch pipe T13, and the control unit controls the injection pump 1 to absorb the diluent in the diluent storage tank 15; the control unit controls the switching valve 2 to close the thirteenth branch pipe T13 and open the twelfth branch pipe T12. At this time, the injection pump 1 is connected with the second reaction tank 14 through the main pipe and the twelfth branch pipe T12, and the control unit controls the injection pump 1 to inject the absorbed diluent into the second reaction tank 14 to dilute the fourth solution, thereby forming a solution for electrochemical detection.

[0114] It should be noted that after each of the above-mentioned liquids passes through the injection pump 1, the injection pump 1 needs to be cleaned. When the injection pump 1 is cleaned, the control unit can control the switching valve 2 to open the fourteenth branch pipe T14. At this time, the injection pump 1 is connected to the cleaning agent storage tank 16 through the main pipe and the fourteenth branch pipe T14. The control unit controls the injection pump 1 to absorb the cleaning agent, and the control unit controls the switching valve 2 to open the sixteenth branch pipe T16, and then the cleaned liquid is discharged to the waste liquid tank 18 through the sixteenth branch pipe T16.

[0115] After the fourth solution is diluted, the control unit can control the switching valve 2 to close the twelfth branch pipe T12 and open the fourteenth branch pipe T14, the injection pump 1 draws the cleaning liquid into the injection pump 1 through the tenth pipe T10, and the switching valve 2 switches the first branch pipe T01, the second branch pipe T02, ..., the tenth pipe T10 and the eleventh branch pipe T11 in sequence, and then cleans the first branch pipe T01, the second branch pipe T02, ..., the tenth pipe T10 and the eleventh branch pipe T11 in sequence, and after cleaning, the solenoid valves 17 are opened to allow the cleaned solution to remain in the waste liquid pool 18.

[0116] The present disclosure also provides a control method for a filtration system, the control method is used to control the filtration system in any of the above embodiments, such as Figure 3 As shown, the control method may include steps S110 to S160, wherein:

[0117] Step S110, opening the first branch pipe T01, and the injection pump 1 absorbs the flocculant;

[0118] Step S120, closing the first branch pipe T01, opening the second branch pipe T02, and injecting the flocculant into the reaction tank;

[0119] Step S130, closing the second branch pipe T02, opening the third branch pipe T03, and the injection pump 1 sucking the raw liquid to be filtered;

[0120] Step S140, closing the third branch pipe T03, opening the second branch pipe T02, injecting the raw liquid to be filtered into the reaction tank, so that the raw liquid to be filtered reacts with the flocculant to generate a mixed liquid containing a lower supernatant and flocs;

[0121] Step S150, after the injection pump 1 absorbs the mixed liquid, the second branch pipe T02 is closed, the fourth branch pipe T04 is opened, and the mixed liquid is injected into the first filter 6;

[0122] Step S160 , discharging the solution filtered by the first filter 6 into the first liquid storage tank 7 .

[0123] The specific details of the control method of the filtration system disclosed in the present invention and its beneficial effects have been described in the embodiments of the corresponding filtration system and will not be repeated here.

[0124] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A filtration system, characterized in that: include: Control unit and injection pump; The switching valve comprises a valve body and a valve core sleeved in the valve body, the valve body is provided with an inlet and a plurality of outlets, the injection pump is connected to the inlet, the first branch pipe, the second branch pipe, the third branch pipe and the fourth branch pipe are respectively connected to different outlets, and the control unit can control the rotation of the valve core to connect or disconnect the inlet with different outlets, so that different branch pipes are opened or closed; A flocculant storage tank is connected to the first branch pipeline, the flocculant storage tank is used to store flocculants, and when the first branch pipeline is opened, the injection pump can absorb the flocculants; A first reaction tank is connected to the second branch pipe, and when the second branch pipe is opened, the injection pump can inject the flocculant into the first reaction tank; a storage tank for the raw liquid to be filtered, which is connected to the third branch pipeline, and is used to store the raw liquid to be filtered; when the third branch pipeline is opened, the injection pump can absorb the raw liquid to be filtered, and when the second branch pipeline is opened, the injection pump can inject the raw liquid to be filtered into the first reaction tank, so that the raw liquid to be filtered reacts with the flocculant to generate a mixed liquid containing a supernatant and flocs; a first filter connected to the fourth branch pipe; when the second branch pipe is opened, the injection pump can absorb the mixed liquid, and when the fourth branch pipe is opened, the injection pump can inject the mixed liquid into the first filter; The first liquid storage tank is connected to the first filter through a first conduit and is used for storing the first solution filtered by the first filter.

2. The filtration system according to claim 1, characterized in that: The filtration system further comprises: a fifth branch pipe, a sixth branch pipe, a seventh branch pipe, an eighth branch pipe, a ninth branch pipe and a tenth branch pipe respectively connected to different outlets; the fifth branch pipe is in communication with the first liquid storage tank; a second filter connected to the sixth branch pipe; when the fifth branch pipe is opened, the injection pump can absorb the first solution, and when the sixth branch pipe is opened, the injection pump can inject the first solution into the second filter; A second liquid storage tank is connected to the second filter through a second conduit and is used to carry the second solution filtered by the second filter; the seventh branch pipeline is connected to the second liquid storage tank; a third filter connected to the eighth branch pipe; when the seventh branch pipe is opened, the injection pump can absorb the second solution, and when the eighth branch pipe is opened, the injection pump can inject the second solution into the third filter; A third liquid storage tank is connected to the third filter through a third conduit and is used to carry the third solution filtered by the third filter; the ninth branch pipeline is connected to the third liquid storage tank; a fourth filter connected to the tenth pipeline; when the ninth branch pipeline is opened, the injection pump can absorb the third solution, and when the tenth branch pipeline is opened, the injection pump can inject the third solution into the fourth filter; a fourth liquid storage tank, connected to the fourth filter through a fourth conduit, and used for carrying a fourth solution filtered by the fourth filter; The pore sizes of the filter screens of the first filter, the second filter, the third filter and the fourth filter decrease in sequence.

3. The filtration system according to claim 2, characterized in that: The filtration system further comprises: an eleventh branch pipe, a twelfth branch pipe and a thirteenth branch pipe respectively connected to different outlets; the eleventh branch pipe is connected to the fourth liquid storage tank; when the eleventh branch pipe is opened, the injection pump can absorb the fourth solution; The second reaction tank is connected to the twelfth branch pipeline; when the twelfth branch pipeline is opened, the injection pump can inject the fourth solution into the second reaction tank; A diluent storage tank is connected to the thirteenth pipeline, and the diluent storage tank is used to store the diluent; when the thirteenth pipeline is opened, the injection pump can absorb the diluent, and when the twelfth pipeline is opened, the injection pump can inject the diluent into the second reaction tank.

4. The filtration system according to claim 3, characterized in that: The filtration system further comprises: a fourteenth branch pipeline connected to different of the outlets; A cleaning agent storage tank is connected to the fourteenth branch pipe, and the cleaning agent storage tank is used to store cleaning agent; when the fourteenth branch pipe is opened, the injection pump can absorb the cleaning agent; when the fourteenth branch pipe is closed and any one of the first branch pipe to the thirteenth branch pipe is opened, the injection pump injects the cleaning agent into the branch pipe in the open state.

5. The filtration system according to claim 2, characterized in that: The pore size of the filter screen of the first filter is 6 microns to 10 microns, the pore size of the filter screen of the second filter is 4 microns to 6 microns, the pore size of the filter screen of the third filter is 0.22 microns to 3 microns, and the fourth filter is used to filter greater than or equal to a preset molecular weight, and the preset molecular weight includes 10 kilodaltons to 100 kilodaltons.

6. The filtration system according to claim 4, characterized in that: The filtration system further comprises: A plurality of liquid level sensors are respectively arranged in the flocculant storage tank, the first reaction tank, the raw liquid storage tank to be filtered, the first storage tank, the second storage tank, the third storage tank, the fourth storage tank, the second reaction tank, the diluent storage tank and the cleaning agent storage tank, and are used to respectively detect the volume values ​​of the liquids in the flocculant storage tank, the first reaction tank, the raw liquid storage tank to be filtered, the first storage tank, the second storage tank, the third storage tank, the fourth storage tank, the second reaction tank, the diluent storage tank and the cleaning agent storage tank; The liquid level sensor is connected to the control unit and can transmit the capacity value to the control unit.

7. The filtration system according to claim 6, characterized in that: The filtration system further comprises: a plurality of pressure sensors, respectively disposed in the first filter, the second filter, the third filter and the fourth filter, for respectively detecting pressure values ​​in the first filter, the second filter, the third filter and the fourth filter; The pressure sensor is connected to the control unit and can transmit the pressure value to the control unit.

8. The filtration system according to claim 7, characterized in that: The control unit comprises a display screen, and the display screen is used to display the capacity value and the pressure value.

9. The filtration system according to any one of claims 1 to 8, characterized in that: The filtration system further comprises: A waste liquid tank, connected to each of the liquid storage tanks and each of the reaction tanks through a drain pipe; A plurality of electromagnetic valves are arranged in the drainage pipes in a one-to-one correspondence.

10. A method for controlling a filtration system, characterized in that: Used to control the filtration system according to any one of claims 1 to 9, the control method comprising: The first branch pipeline is opened, and the injection pump sucks the flocculant; Closing the first branch pipe, opening the second branch pipe, and injecting the flocculant into the reaction tank; The second branch pipeline is closed, the third branch pipeline is opened, and the injection pump draws the raw liquid to be filtered; Close the third branch pipe, open the second branch pipe, and inject the raw liquid to be filtered into the reaction tank, so that the raw liquid to be filtered reacts with the flocculant to generate a mixed liquid containing a lower supernatant and floccules; After the injection pump absorbs the mixed liquid, the second branch pipe is closed, the fourth branch pipe is opened, and the mixed liquid is injected into the first filter; The solution filtered by the first filter is discharged into the first liquid storage tank.

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