Diatomite filtering system and method capable of continuously working

Abstract

The invention relates to a filtering system, in particular to a diatomite filtering system and method capable of continuously working, and the diatomite filtering system comprises a liquid outlet / backwashing liquid inlet pipe, a liquid inlet pipe, a backwashing liquid discharge pipe, a plurality of filtering units, and a film coating unit communicated with the plurality of filtering units; a three-way joint is arranged at a liquid inlet of each filtering unit, and the liquid inlets of the multiple filtering units are communicated with a liquid inlet pipe and a backwashing liquid discharge pipe through the three-way joints; a liquid inlet stop valve and a backwashing liquid discharge stop valve are respectively arranged at the joint of the three-way joint and the liquid inlet pipe and the joint of the three-way joint and the backwashing liquid discharge pipe; a front filtering unit is arranged at the liquid inlet end of the liquid inlet pipe; and the liquid outlet / backwashing liquid inlets of the plurality of filtering units are communicated with a liquid outlet / backwashing liquid inlet pipe. According to the invention, one or more filter units can be backwashed as required, and all the filter units do not need to be shut down, so that the filter efficiency can be improved.

Description

Technical Field

[0001] The present invention relates to a filtration system, and more particularly to a diatomaceous earth filtration system and method that can operate continuously. Background Art

[0002] In the field of water treatment, for different application scenarios, the treatment requirements for suspended solids have their own unique characteristics, but the core objective is to ensure that the water quality meets specific usage requirements. The following is an overview of several typical application scenarios and their corresponding treatment requirements:

[0003] In a cooling system, circulating cooling water plays a crucial role. It effectively removes heat through heat exchange. However, during this process, many impurities will inevitably accumulate. To prevent impurities from scaling in the cooling system, it is particularly important to strictly control the water quality of the circulating cooling water.

[0004] At the same time, during the operation of the cooling system, raw water needs to be replenished regularly due to water evaporation. These replenished raw waters must be properly treated to ensure their quality meets the usage requirements of the cooling system, thus avoiding the introduction of new impurities.

[0005] Industrial wastewater treatment faces more complex challenges. The wastewater contains a large amount of impurities. If directly discharged, it is very likely to violate environmental protection standards. Membrane treatment technology, as an effective sewage treatment method, is widely used. However, impurities are prone to clogging the filter membrane, thereby reducing the treatment efficiency. Therefore, the pretreatment step is particularly important, which can effectively reduce the risk of membrane clogging and ensure the smooth progress of the treatment process.

[0006] For a swimming pool circulation purification system, the continuous purification of water quality is crucial. The swimming pool water will be continuously polluted during use, so it needs to be treated through a circulation purification system. This process covers multiple links such as filtration and disinfection. Among them, the filtration link is the most critical, which is directly related to the clarity and hygienic safety of the water quality. An efficient filtration system can not only significantly improve the water quality but also play a positive role in achieving energy conservation and emission reduction.

[0007] It is worth mentioning that due to its unique physical properties - high porosity (90% - 92%) and large specific surface area, diatomaceous earth has shown great potential in the field of water treatment; it can reduce the filtration resistance and effectively adsorb fine colloids in water, thus meeting strict water quality requirements; however, the current diatomaceous earth filtration system still needs to stop during backwashing, which undoubtedly affects the water treatment efficiency. Summary of the Invention

[0008] The object of the present invention is to solve the technical problem that the existing diatomaceous earth filtration system needs to stop completely during backwashing, which affects the water treatment efficiency, and to provide a diatomaceous earth filtration system and method that can operate continuously.

[0009] To solve the above technical problems, the technical solution provided by the present invention is as follows:

[0010] A diatomite filtration system capable of continuous operation, comprising a liquid outlet / backwashing inlet pipe, a liquid inlet pipe, a backwashing drain pipe, and a plurality of filtration units, as well as a coating unit communicated with the plurality of filtration units;

[0011] A three-way joint is provided at the liquid inlet of the filtration unit, and the liquid inlets of the plurality of filtration units are all communicated with the liquid inlet pipe and the backwashing drain pipe through the three-way joint; an inlet stop valve and a backwashing liquid discharge stop valve are respectively provided at the connection positions of the three-way joint with the liquid inlet pipe and the backwashing drain pipe;

[0012] A pre-filter unit is provided at the liquid inlet end of the liquid inlet pipe;

[0013] The liquid outlet / backwashing inlets of the plurality of filtration units are all communicated with the liquid outlet / backwashing inlet pipe.

[0014] Furthermore, the filtration unit includes a tank body, and an upper head and a lower head respectively arranged at the upper and lower ends of the tank body;

[0015] The liquid outlet / backwashing inlet is opened on the upper head, and the liquid outlet / backwashing inlet is communicated with the liquid outlet / backwashing inlet pipe;

[0016] The liquid inlet is opened on the lower head, and a three-way joint is provided at the liquid inlet of the lower head; a water distributor communicated with the liquid inlet is arranged inside the lower head;

[0017] A filter disc is rotatably installed at the upper end of the tank body, and a filter rod is arranged below the filter disc at the liquid passing hole of the filter disc;

[0018] A rotating shaft is arranged in the middle of the filter disc, the upper end of the rotating shaft is rotatably installed on the inner wall of the upper head, and the upper end of the rotating shaft penetrates through the upper head and extends outside the upper head, and a swing motor with an output shaft connected to the rotating shaft is arranged at the top of the upper head.

[0019] Furthermore, the filter rod includes a support spring, and a connection head and a plug respectively fixed at both ends of the support spring;

[0020] The connection head is installed in the liquid passing hole;

[0021] A filter screen is arranged on the side parts of the support spring, the connection head and the plug, and a diatomite filter membrane is attached to the outside of the filter screen.

[0022] Furthermore, the coating unit includes a diatomite storage barrel filled with diatomite;

[0023] A diatomite delivery pipe and a filtrate delivery pipe are arranged at the top of the diatomite storage barrel;

[0024] The diatomaceous earth conveying pipe is connected to the three-way joints at the liquid inlets of multiple filtering units, and the filtrate conveying pipe is connected to the liquid outlet / backwash liquid inlet pipe;

[0025] A diatomaceous earth conveying pump and a filtrate conveying pump are respectively arranged on the diatomaceous earth conveying pipe and the filtrate conveying pipe.

[0026] Furthermore, the pre-filtering unit includes a water pump and a hair filter;

[0027] A connecting pipe is connected between the liquid inlet of the water pump and the liquid outlet of the hair filter, and the liquid outlet of the water pump is connected to the liquid inlet pipe;

[0028] The liquid inlet of the hair filter is connected to a water source;

[0029] A reflux pipe is connected between the liquid outlet / backwash liquid inlet pipe and the connecting pipe, and a reflux stop valve and a filtering stop valve are respectively arranged on the reflux pipe and at one end of the connecting pipe close to the liquid outlet of the hair filter.

[0030] The present invention also provides a diatomaceous earth filtering method capable of continuous operation, comprising the following steps:

[0031] S1. Configure valve states:

[0032] Set the backwash time for each filtering unit, and at the same time keep the liquid inlet stop valves on all filtering units in the open state and the backwash liquid discharge stop valves in the closed state;

[0033] S2. Pre-coat:

[0034] Configure a pre-coating liquid, and input the pre-coating liquid in the coating unit into the filtering unit to form a diatomaceous earth filtering membrane in the filtering unit;

[0035] S3. Filter:

[0036] Inject the raw water or stock solution to be filtered into the filtering unit through the liquid inlet pipe, and the raw water or stock solution is discharged through the liquid outlet / backwash liquid inlet pipe after being filtered by the filtering unit;

[0037] S4. Backwash:

[0038] When one of the filtering units reaches the backwash time, close the corresponding liquid inlet stop valve on the filtering unit to be backwashed and open the backwash liquid discharge stop valve;

[0039] The filtered raw water or stock solution enters the filtering unit through the liquid outlet / backwash liquid inlet pipe, scours the diatomaceous earth filtering membrane in the filtering unit, and is discharged through the backwash liquid discharge pipe;

[0040] S5. Coating after backwash:

[0041] Prepare a coating solution and input the coating solution in the coating unit into the filtered unit after backwashing to form a diatomite filter membrane in the filtered unit.

[0042] S6. Repeat the above steps S3 to S5 to achieve the filtration of raw water or stock solution.

[0043] Further, step S2 is specifically as follows:

[0044] Weigh the diatomite for pre-coating multiple filtered units and add it to the diatomite storage bucket; add the filtered raw water or stock solution to the diatomite storage bucket, and obtain a pre-coating solution after stirring.

[0045] Input the pre-coating solution in the diatomite storage bucket into the tank through a diatomite transfer pump. After the pre-coating solution passes through the filter screen, the diatomite adheres to the filter screen to form a diatomite filter membrane. The filtered raw water or stock solution enters the inside of the support spring through the filter screen, and enters the space between the upper head and the filter disc through the liquid passing holes, and is discharged through the liquid outlet / backwashing inlet pipe.

[0046] Further, step S3 is specifically as follows:

[0047] Pump the raw water or stock solution to be filtered into the inlet pipe through a water pump via a hair filter and a connecting pipe.

[0048] The raw water or stock solution enters the water distributor through a three-way joint, and after being dispersed by the water distributor, it enters the filter tank.

[0049] The raw water or stock solution enters the inside of the support spring after being filtered by the diatomite filter membrane and the filter screen, and enters the space between the upper head and the filter disc through the liquid passing holes. The filtered raw water or stock solution is discharged through the liquid outlet / backwashing inlet pipe.

[0050] Further, step S4 is specifically as follows:

[0051] When one of the filtered units reaches the backwashing time, close the inlet shut-off valve corresponding to the corresponding filtered unit, and open the backwashing liquid discharge shut-off valve.

[0052] The filtered raw water or stock solution enters the tank of the filtered unit to be backwashed through the liquid outlet / backwashing inlet pipe, and enters the inside of the support spring through the liquid passing holes, and backwashes the diatomite filter membrane attached to the surface of the filter screen with the filtered raw water or stock solution.

[0053] Meanwhile, start the swing motor on the corresponding filtered unit, so that the swing motor drives the filter disc to reciprocate in the tank through the rotating shaft, makes the filter rod swing in the liquid, washes the diatomite layer on the surface of the filter screen into the tank, and discharges it through the backwashing liquid discharge pipe.

[0054] Further, step S5 is specifically as follows:

[0055] Weigh the diatomaceous earth used for pre-coating the filtered unit after backwashing, and add it into the diatomaceous earth storage barrel;

[0056] Use the filtrate transfer pump to suck the filtered raw water or stock solution in the liquid outlet / backwash inlet pipe into the diatomaceous earth storage barrel, and obtain the coating solution after stirring;

[0057] Suck the coating solution in the diatomaceous earth storage barrel into the tank of the filtered unit that needs to be coated after backwashing through the diatomaceous earth transfer pump. After the coating solution is filtered by the filter screen, the diatomaceous earth adheres to the filter screen to form a diatomaceous earth filter membrane. The filtered raw water or stock solution enters the inside of the support spring through the filter screen, and enters between the upper head and the filter disc through the liquid passing holes, and is discharged through the liquid outlet / backwash inlet pipe.

[0058] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0059] 1. The continuously operable diatomaceous earth filtration system and method provided by the present invention can backwash one or more of the filtration units as needed without shutting down all of them, thus ensuring that other filtration units can still continue to work during the backwashing process, and improving the overall filtration efficiency.

[0060] 2. The continuously operable diatomaceous earth filtration system and method provided by the present invention are provided with a diatomaceous earth storage barrel, a diatomaceous earth transfer pump and a filtrate transfer pump, which are convenient for configuring the coating solution containing diatomaceous earth in the diatomaceous earth storage barrel, and sending the coating solution containing diatomaceous earth into the tank through the diatomaceous earth transfer pump to complete the pre-coating before filtration or the coating after backwashing, forming a diatomaceous earth filter membrane, which helps to filter the raw water or stock solution.

[0061] 3. When backwashing, the inlet stop valve of the filtration unit that needs to be backwashed is closed, and the backwash liquid discharge stop valve is opened; the filtered raw water or stock solution in the liquid outlet / backwash inlet pipe enters the tank, and enters the inside of the support spring through the liquid passing holes. The filtered raw water or stock solution can backwash the diatomaceous earth filter membrane attached to the surface of the filter screen; at the same time, by setting a swing motor, a filter disc and a filter rod, the filter rod is swung in the liquid by the swing motor, which helps to wash the diatomaceous earth filter membrane on the surface of the filter screen and enhances the backwashing effect.

[0062] 4. The continuously operable diatomaceous earth filtration system and method provided by the present invention are provided with a pre-filtration unit to preliminarily filter the raw water or stock solution to be filtered, reducing the influence of impurities on the subsequent filtration units and further improving the filtration efficiency. Description of the Drawings

[0063] Figure 1 Schematic structural diagram of an embodiment of the present invention;

[0064] Figure 2 Schematic structural diagram of the filter rod in the embodiment of the present invention.

[0065] Explanation of reference numerals: 1 - liquid outlet / backwash inlet pipe, 2 - inlet pipe, 3 - backwash drain pipe, 4 - filtration unit, 41 - tank body, 42 - upper head, 43 - lower head, 44 - filter disc, 45 - filter rod, 451 - support spring, 452 - connector, 453 - plug, 454 - filter screen, 46 - rotating shaft, 47 - swing motor, 5 - tee joint, 6 - inlet shut-off valve, 7 - backwash liquid discharge shut-off valve, 8 - water pump, 9 - hair filter, 10 - connecting pipe, 11 - return pipe, 12 - return shut-off valve, 13 - filtration shut-off valve, 14 - diatomaceous earth storage bucket, 15 - diatomaceous earth delivery pipe, 16 - filtrate delivery pipe, 17 - diatomaceous earth delivery pump, 18 - filtrate delivery pump, 19 - water distributor. Detailed implementation manners

[0066] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0067] As Figure 1 shown, a diatomaceous earth filtration system capable of continuous operation includes a liquid outlet / backwash inlet pipe 1, an inlet pipe 2, a backwash drain pipe 3, and a plurality of filtration units 4, as well as a coating unit connected to the plurality of filtration units 4; a tee joint 5 is provided at the inlet of the filtration unit 4, and the inlets of the plurality of filtration units 4 are all connected to the inlet pipe 2 and the backwash drain pipe 3 through the tee joint 5; inlet shut-off valves 6 and backwash liquid discharge shut-off valves 7 are respectively provided at the connection points of the tee joint 5 with the inlet pipe 2 and the backwash drain pipe 3;

[0068] As Figure 1 shown, in order to reduce the influence of impurities in raw water or stock solution on the filtration unit 4, a pre-filtration unit 4 is provided at the inlet end of the inlet pipe 2; the pre-filtration unit 4 includes a water pump 8 and a hair filter 9; a connecting pipe 10 is connected between the inlet of the water pump 8 and the outlet of the hair filter 9, and the outlet of the water pump 8 is connected to the inlet pipe 2; the inlet of the hair filter 9 is connected to a water source; preliminary filtration of raw water or stock solution is achieved through the hair filter 9. The liquid outlet / backwash inlet pipe 1 is connected to the connecting pipe 10 through a return pipe 11, and a return shut-off valve 12 and a filtration shut-off valve 13 are respectively provided on the return pipe 11 and at one end of the connecting pipe 10 close to the outlet of the hair filter 9.

[0069] As Figure 1 shown, the liquid outlet / backwash inlet of multiple filtering units 4 is communicated with the liquid outlet / backwash inlet pipe 1.

[0070] As Figure 1 shown, the filtering unit 4 includes a tank body 41, an upper head 42 and a lower head 43 respectively arranged at the upper and lower ends of the tank body 41; a liquid outlet / backwash inlet is provided on the upper head 42, and the liquid outlet / backwash inlet is communicated with the liquid outlet / backwash inlet pipe 1; a liquid inlet is provided on the lower head 43, and a tee joint 5 is provided at the liquid inlet of the lower head 43; a water distributor 19 communicated with the liquid inlet is arranged in the lower head 43; a filter disc 44 is rotatably installed at the upper end of the tank body 41, and filter rods 45 are arranged below the filter disc 44 at the liquid passing holes of the filter disc 44; a rotating shaft 46 is arranged in the middle of the filter disc 44, the upper end of the rotating shaft 46 is rotatably installed on the inner wall of the upper head 42, and the upper end of the rotating shaft 46 penetrates through the upper head 42 and extends outside the upper head 42, and a swing motor 47 with an output shaft connected to the rotating shaft 46 is arranged at the top of the upper head 42.

[0071] A sewage outlet is further arranged at the bottom of the lower head 43 for discharging impurities filtered by the diatomite filter membrane and the diatomite filter membrane washed away by backwashing.

[0072] As Figure 2 shown, the filter rod 45 includes a support spring 451, and connection heads 452 and plug heads 453 respectively fixed at both ends of the support spring 451; the connection head 452 is installed in the liquid passing hole; a filter screen 454 is arranged on the side parts of the support spring 451, the connection head 452 and the plug head 453, and a diatomite filter membrane is attached to the outside of the filter screen 454.

[0073] As Figure 1 shown, in order to supplement diatomite into the filtering unit 4 to form a diatomite filter membrane after the backwashing is completed, the coating unit includes a diatomite storage barrel 14 filled with diatomite; a diatomite delivery pipe 15 and a filtrate delivery pipe 16 are arranged at the top of the diatomite storage barrel 14; the diatomite delivery pipe 15 is communicated with the tee joint 5 at the liquid inlet of multiple filtering units 4, and the filtrate delivery pipe 16 is communicated with the liquid outlet / backwash inlet pipe 1; a diatomite delivery pump 17 and a filtrate delivery pump 18 are respectively arranged on the diatomite delivery pipe 15 and the filtrate delivery pipe 16.

[0074] The continuous working diatomite filtering method provided by the present invention is specifically as follows:

[0075] 1) Configure the valve state:

[0076] Set backwash times for each filtration unit 4. Among them, the set backwash times for each filtration unit 4 are different, which facilitates the sequential and alternating backwashing of the diatomite filter membranes in the filtration units 4;

[0077] At the same time, keep the liquid inlet stop valves 6 and the filtration stop valves 13 on all the filtration units 4 in the open state, and keep the backwash liquid discharge stop valve 7 in the closed state;

[0078] 2) Pre-coating:

[0079] Weigh the diatomite used for pre-coating multiple filtration units 4 and add it to the diatomite storage bucket 14; add the filtered raw water or stock solution to the diatomite storage bucket 14 and stir to obtain the pre-coating liquid;

[0080] Use the diatomite transfer pump 17 to input the pre-coating liquid in the diatomite storage bucket 14 into the tank body 41. After the pre-coating liquid is filtered by the filter screen 454, the diatomite adheres to the filter screen 454 to form a diatomite filter membrane. The filtered raw water or stock solution enters the inside of the support spring 451 through the filter screen 454 and enters between the upper head 42 and the filter disc 44 through the liquid passing holes, and is discharged through the liquid outlet / backwash liquid inlet pipe 1;

[0081] 3) Filtration:

[0082] Use the water pump 8 to pump the raw water or stock solution to be filtered through the hair filter 9 and the connecting pipe 10 into the liquid inlet pipe 2;

[0083] The raw water or stock solution enters the water distributor 19 through the three-way joint 5. After being dispersed by the water distributor 19, the raw water or stock solution enters the filtration tank body 41;

[0084] The raw water or stock solution passes through the diatomite filter membrane and the filter screen 454 and then enters the inside of the support spring 451, and enters between the upper head 42 and the filter disc 44 through the liquid passing holes. The filtered raw water or stock solution is discharged through the liquid outlet / backwash liquid inlet pipe 1;

[0085] 4) Backwashing:

[0086] When one of the filtration units 4 reaches the backwash time, or when the pressure of the diatomite on the surface of the filter screen 454 increases to the critical value, close the liquid inlet stop valve 6 corresponding to the corresponding filtration unit 4 and open the backwash liquid discharge stop valve 7;

[0087] The filtered raw water or stock solution enters the tank body 41 of the filtration unit 4 to be backwashed through the liquid outlet / backwash liquid inlet pipe 1, and enters the inside of the support spring 451 through the liquid passing holes. The filtered raw water or stock solution is used to backwash the diatomite filter membrane attached to the surface of the filter screen 454;

[0088] Meanwhile, start the swing motor 47 on the corresponding filter unit 4, so that the swing motor 47 drives the filter disc 44 to rotate reciprocally in the tank body 41 through the rotating shaft 46, causing the filter rod 45 to swing in the liquid, washing the diatomaceous earth layer on the surface of the filter screen 454 into the tank body 41, and discharging it through the backwash liquid discharge pipe;

[0089] 5) Coating after backwashing:

[0090] Weigh the diatomaceous earth used for pre-coating the filter unit 4 after backwashing, and add it into the diatomaceous earth storage barrel 14;

[0091] Through the filtrate delivery pump 18, suck the filtered raw water or stock solution in the liquid outlet / backwash inlet pipe 1 into the diatomaceous earth storage barrel 14, and obtain the coating solution after stirring;

[0092] Suck the coating solution in the diatomaceous earth storage barrel 14 into the tank body 41 of the filter unit 4 that needs to be coated after backwashing through the diatomaceous earth delivery pump 17. After the coating solution is filtered by the filter screen 454, the diatomaceous earth adheres to the filter screen 454 to form a diatomaceous earth filter membrane. The filtered raw water or stock solution enters the inside of the support spring 451 through the filter screen 454, and enters between the upper head 42 and the filter disc 44 through the liquid passing holes, and is discharged through the liquid outlet / backwash inlet pipe 1;

[0093] 6) Repeat the above steps 3) to 5) to achieve the filtration of raw water or stock solution.

[0094] The continuously operable diatomaceous earth filtration system and method provided by the present invention can backwash one or more of the filter units 44 as needed without shutting down all of them, thus ensuring that other filter units 44 can still continue to work during the backwashing process, improving the overall filtration efficiency, and achieving continuous operation; it is applicable to the water treatment of circulating cooling water and makeup water raw water in the cooling system, as well as the end water treatment of industrial wastewater and the pre-treatment of membrane process.

[0095] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any change or replacement within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A diatomaceous earth filtration system capable of continuous operation, characterized in that: It includes a liquid outlet / backwash inlet pipe (1), an inlet pipe (2), a backwash drain pipe (3), multiple filter units (4), and a coating unit communicated with the multiple filter units (4); A three-way joint (5) is provided at the liquid inlet of the filter unit (4), and the liquid inlets of the multiple filter units (4) are all communicated with the inlet pipe (2) and the backwash drain pipe (3) through the three-way joint (5); an inlet stop valve (6) and a backwash liquid discharge stop valve (7) are respectively provided at the connection positions of the three-way joint (5) with the inlet pipe (2) and the backwash drain pipe (3); A pre-filter unit (4) is provided at the liquid inlet end of the inlet pipe (2); The liquid outlet / backwash inlets of the multiple filter units (4) are all communicated with the liquid outlet / backwash inlet pipe (1).

2. The diatomaceous earth filtration system capable of continuous operation according to claim 1, wherein: The filter unit (4) includes a tank body (41), and an upper head (42) and a lower head (43) respectively arranged at the upper and lower ends of the tank body (41); The liquid outlet / backwash inlet is opened on the upper head (42), and the liquid outlet / backwash inlet is communicated with the liquid outlet / backwash inlet pipe (1); The liquid inlet is opened on the lower head (43), and a three-way joint (5) is provided at the liquid inlet of the lower head (43); a water distributor (19) communicated with the liquid inlet is arranged in the lower head (43); A filter disc (44) is rotatably installed at the upper end of the tank body (41), and a filter rod (45) is arranged below the filter disc (44) at the liquid passing holes of the filter disc (44); A rotating shaft (46) is arranged in the middle of the filter disc (44), the upper end of the rotating shaft (46) is rotatably installed on the inner wall of the upper head (42), and the upper end of the rotating shaft (46) penetrates through the upper head (42) and extends outside the upper head (42), and a swing motor (47) with an output shaft connected to the rotating shaft (46) is arranged on the top of the upper head (42).

3. The diatomaceous earth filtration system capable of continuous operation according to claim 2, characterized in that: The filter rod (45) includes a support spring (451), and a connection head (452) and a plug (453) respectively fixed at both ends of the support spring (451); The connection head (452) is installed in the liquid passing hole; A filter screen (454) is arranged on the side parts of the support spring (451), the connection head (452) and the plug (453), and a diatomite filter membrane is attached to the outside of the filter screen (454).

4. The diatomaceous earth filtration system capable of continuous operation according to claim 1, wherein: The coating unit includes a diatomite storage barrel (14), and diatomite is filled in the diatomite storage barrel (14); A diatomite delivery pipe (15) and a filtrate delivery pipe (16) are arranged on the top of the diatomite storage barrel (14); The diatomite delivery pipe (15) is communicated with the three-way joint (5) at the liquid inlet of the multiple filter units (4), and the filtrate delivery pipe (16) is communicated with the liquid outlet / backwash inlet pipe (1); A diatomite delivery pump (17) and a filtrate delivery pump (18) are respectively arranged on the diatomite delivery pipe (15) and the filtrate delivery pipe (16).

5. The diatomaceous earth filtration system capable of continuous operation according to claim 1, wherein: The pre-filter unit (4) includes a water pump (8) and a hair filter (9); The liquid inlet of the water pump (8) is communicated with the liquid outlet of the hair filter (9) through a connecting pipe (10), and the liquid outlet of the water pump (8) is communicated with the inlet pipe (2); The liquid inlet of the hair filter (9) is communicated with a water source; A reflux pipe (11) is used to communicate the liquid outlet / backwash inlet pipe (1) with the connecting pipe (10). A reflux cut-off valve (12) and a filtration cut-off valve (13) are respectively arranged on the reflux pipe (11) and at one end of the connecting pipe (10) close to the liquid outlet of the hair filter (9).

6. A diatomaceous earth filtration method capable of continuous operation, characterized in that, It includes the following steps: S1. Configure valve states: Set the backwash time for each filtration unit (4), and at the same time, keep the liquid inlet cut-off valves (6) on all the filtration units (4) in the open state and the backwash liquid discharge cut-off valves (7) in the closed state; S2. Pre-coat the film: Prepare a pre-coating liquid, and input the pre-coating liquid in the coating unit into the filtration unit (4) to form a diatomite filtration membrane in the filtration unit (4); S3. Filter: Inject the raw water or stock solution to be filtered into the filtration unit (4) through the liquid inlet pipe (2). After being filtered by the filtration unit (4), the raw water or stock solution is discharged through the liquid outlet / backwash inlet pipe (1); S4. Backwash: When one of the filtration units (4) reaches the backwash time, close the corresponding liquid inlet cut-off valve (6) on the filtration unit (4) to be backwashed and open the backwash liquid discharge cut-off valve (7); The filtered raw water or stock solution enters the filtration unit (4) through the liquid outlet / backwash inlet pipe (1), scours the diatomite filtration membrane in the filtration unit (4), and is discharged through the backwash liquid discharge pipe; S5. Coat the film after backwashing: Prepare a coating liquid, and input the coating liquid in the coating unit into the filtration unit (4) after backwashing to form a diatomite filtration membrane in the filtration unit (4); S6. Repeat the above steps S3 to S5 to realize the filtration of the raw water or stock solution.

7. The continuous working diatomaceous earth filtration method according to claim 6, characterized in that, Step S2 is specifically as follows: Weigh the diatomite used for pre-coating multiple filtration units (4), and add it into the diatomite storage bucket (14); add the filtered raw water or stock solution into the diatomite storage bucket (14), and obtain the pre-coating liquid after stirring; Input the pre-coating liquid in the diatomite storage bucket (14) into the tank body (41) through the diatomite delivery pump (17). After being filtered by the filter screen (454), the diatomite adheres to the filter screen (454) to form a diatomite filtration membrane. The filtered raw water or stock solution enters the inside of the support spring (451) through the filter screen (454), and enters the space between the upper head (42) and the filter disc (44) through the liquid passing holes, and is discharged through the liquid outlet / backwash inlet pipe (1).

8. The continuous working diatomaceous earth filtration method according to claim 6, characterized in that, Step S3 is specifically as follows: Pump the raw water or stock solution to be filtered into the liquid inlet pipe (2) through the hair filter (9) and the connecting pipe (10) by a water pump (8); The raw water or stock solution enters the water distributor (19) through the three-way joint (5), and after being dispersed by the water distributor (19), enters the filtration tank body (41); The raw water or stock solution passes through the diatomite filtration membrane and the filter screen (454) and then enters the inside of the support spring (451), and enters the space between the upper head (42) and the filter disc (44) through the liquid passing holes. The filtered raw water or stock solution is discharged through the liquid outlet / backwash inlet pipe (1).

9. The continuous working diatomaceous earth filtration method according to claim 6, characterized in that, Step S4 is specifically as follows: When one of the filtration units (4) reaches the backwashing time, close the liquid inlet stop valve (6) corresponding to the corresponding filtration unit (4), and open the backwashing liquid discharge stop valve (7); The filtered raw water or stock solution enters the tank body (41) of the filtration unit (4) that needs to be backwashed through the liquid outlet / backwashing liquid inlet pipe (1), and enters the inside of the support spring (451) through the liquid passing holes. The filtered raw water or stock solution is used to backwash the diatomite filtration membrane attached to the surface of the filter screen (454); Meanwhile, start the swing motor (47) on the corresponding filtration unit (4), so that the swing motor (47) drives the filter disc (44) to rotate reciprocally in the tank body (41) through the rotating shaft (46), making the filter rod (45) swing in the liquid, washing the diatomite layer on the surface of the filter screen (454) into the tank body (41), and discharging it through the backwashing liquid discharge pipe.

10. The continuous diatomaceous earth filtration method according to claim 6, characterized in that, Step S5 is specifically as follows: Weigh the diatomite used for pre-coating the backwashed filtration unit (4), and add it into the diatomite storage barrel (14); Use the filtrate transfer pump (18) to suck the filtered raw water or stock solution in the liquid outlet / backwashing liquid inlet pipe (1) into the diatomite storage barrel (14), and obtain the coating solution after stirring; Suck the coating solution in the diatomite storage barrel (14) into the tank body (41) of the filtration unit (4) that needs to be coated after backwashing through the diatomite transfer pump (17). After the coating solution is filtered by the filter screen (454), the diatomite adheres to the filter screen (454) to form a diatomite filtration membrane. The filtered raw water or stock solution enters the inside of the support spring (451) through the filter screen (454), and enters the space between the upper head (42) and the filter disc (44) through the liquid passing holes, and is discharged through the liquid outlet / backwashing liquid inlet pipe (1).

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