AU2024200538A1

AU2024200538A1 - Regenerative filtration system and control method thereof

Info

Publication number: AU2024200538A1
Application number: AU2024200538A
Authority: AU
Inventors: Yufang Chen; Andrew Mark Smith
Original assignee: Af Water Systems Equipment Co Ltd
Current assignee: Af Water Systems Equipment Co Ltd
Priority date: 2022-07-06
Filing date: 2024-01-30
Publication date: 2025-01-23
Also published as: KR20250007392A; CN115353236A; CN117003299A

Abstract

OF THE DISCLOSURE The present disclosure relates to a regenerative filtration system and a control method thereof. The regenerative filtration system has a closed loop pre-coat mode, an external 5 circulation filtration mode, a regenerative mode and a medium replacement mode. After the system is started, a control device controls the system to enter the closed loop pre-coat mode, and the system enters the external circulation filtration mode after the closed loop pre-coat mode reaches preset time. The control device detects the water quality in a pool or the water quality of an external circulation water outlet of a regenerative filter through a water quality monitoring 10 module and analyzes whether the water quality meets water quality standard requirements. If the water quality does not meet the water quality standard requirements, a dosing module is controlled to dose chemicals into the pool to adjust the water quality. The water quality can be detected while filtering, and the chemicals can be dosed according to the water quality, so that the water quality can reach a stable state. The regenerative filter does not need backwashing, and 15 a filter medium can be recycled. The system actually controls the automatic operation of a whole filtration process through the data of various valves, water flow rate, water pressure and air pressure. (FIG. 2) 28 2/6 A B er F detection module B--" - -hypochlorite -- Sodium 6 bicarbonate L--- - 46 10 FIG. 2 43 4108 49 45 16 5 6 7 18 20 - - -13 -dd2 110 1 22 107 21 41 310 11 103 106 102_ 10 1052 15 109I FIG. 3 2

Description

2/6

A B

er F detection module

B--" - -hypochlorite

-- Sodium 6 bicarbonate

10 FIG. 2

- 46 L---

43 4108 49 45 16 5 6 7 18 20

- - -13 -dd2 110 1

22 107

21 41 310 11 103 106 102_ 10 1052 15 109I

FIG. 3

REGENERATIVE FILTRATION SYSTEM AND CONTROL METHOD THEREOF TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of filtration systems, in particular to a regenerative filtration system and a control method thereof.

BACKGROUND

[0002] The existing filter control system only aims at automatic control of the filter, and the traditional automatic control of the filter only controls the circulating water pump to perform forward and backward flushing. Without the addition of sensors to get more information, the equipment needed in the whole swimming pool machine room, such as a water pump, a heat pump, lighting equipment, UV (ultraviolet) disinfection equipment, ozone disinfection equipment and other equipment, is not controlled together, so that the control method is relatively simple.

[0003] However, in the existing filtration systems of swimming pools, most water pumps are manually controlled. Water in the swimming pool is pumped into the sand filter for filtration, or backwashing is manually controlled. The sand filter is manually controlled, pneumatically controlled and electrically controlled. However, pneumatic and electric control are only control for sand tank operation, but not control for the whole water filtration circulation system. Nowadays, in the swimming pool filtration system in China, various sensors are rarely used for all-round automatic control, and the equipment in the whole swimming pool machine room is rarely related for management. Otherwise, operators spend more energy to operate and maintain the system. If being blocked, the pipeline is easily exploded. Without flow rate monitoring of the circulating water pump- the water pump is easy to damage in idle under the situation of flow disconnection. Therefore, it is necessary to ensure water flow during the operation of the whole system. Thus, real-time detection capacity of the system the system is required. The data is transmitted to a PLC (Programmable Logic Controller) through the sensor, and then corresponding measures are adopted through the arrangement of the system. The traditional filtration system has a single control mode, and is free of a protection function or a real-time monitoring function. There is no way to find problems in real time, and a lot of time is spent to find and solve existing problems.

[0004] In addition, the filter in the prior art needs manual backwashing for the filter medium or direct replacement of the medium and the filter element, so how to realize the recycling of the filter medium without backwashing is also the problem to be solved by the present disclosure.

SUMMARY

[0005] In order to solve the problems, the present disclosure provides a regenerative filtration system and a control method thereof. The automation of a whole filtration process is actually controlled through the data of various valves, water flow rate, water pressure and air pressure.

[0006] In order to achieve the above purposes, the present disclosure provides the following technical schemes.

[0007] Disclosed is a control method of a regenerative filtration system. The regenerative filtration system has one or more of a closed loop pre-coat mode, an external circulation filtration mode, a regenerative mode and a medium replacement mode. After the regenerative filtration system is started, a control device controls the system to enter the closed loop pre-coat mode, and the system enters the external circulation filtration mode after the closed loop pre-coat mode reaches preset time. The control device detects the water quality in a pool 10 or the water quality of an external circulation water outlet 44 of a regenerative filter 4 through a water quality monitoring module 8 and analyzes whether the water quality meets water quality standard requirements. If the water quality does not meet the water quality standard requirements, a dosing module 9 is controlled to dose chemicals into the pool 10 to adjust the water quality.

[0008] The regenerative filtration system enters the regenerative mode when operating to preset cumulated working time or preset timing time. In the regenerative mode, perlite powder is shaken off from filter element hoses, the system re-enters the closed loop pre-coat mode and the external circulation filtration mode in sequence after the regenerative mode reaches preset time, and the shaken perlite powder is adhered to the filter element hoses in the closed loop pre-coat mode.

[0009] The control device respectively detects and collects the inlet water pressure X of a filtration water inlet 41 of the regenerative filter 4 and the outlet water pressure Y of a filtration water outlet 44 of the regenerative filter 4 through a first pressure sensor 3 and a second pressure sensor 5. When X-Y| is greater than or equal to Z and Z is 50+/-5, it is judged that the system is necessary to enter the medium replacement mode to replace perlite powder in the regenerative filter 4. After the medium replacement mode is finished, the system re-enters the closed loop pre coat mode and the external circulation filtration mode in sequence, and the shaken perlite powder is adhered to the filter element hoses in the closed loop pre-coat mode.

[0010] As a preferred embodiment, it is further restricted that the analysis of whether the water quality meets the water quality standard requirements is to perform at least one of the following judgments:

[0011] judgment P1, whether the redox potential (ORP) is greater than or equal to 650mV;

[0012] judgment P2, whether the potential of hydrogen (pH value) is between 7.2 and 7.8.

[0013] The dosing module 9 doses water quality treatment substances into the pool 10, and the water quality treatment substances include chlorine-containing disinfectants and pH regulators.

[0014] When the ORP is less than 650 mV, the control device controls the dosing module 9 to dose the chlorine-containing disinfectants into the pool 10.

[0015] When the pH is greater than 7.8, the control device controls the dosing module 9 doses the pH regulators into the pool 10.

[0016] As a preferred embodiment, it is further restricted that the regenerative filtration system includes a circulating water pump 2 for conveying pool water into the regenerative filter 4, a water pump speed-regulating frequency converter, a water inlet valve 11 and an exhaust port valve 12. The water pump speed-regulating frequency converter is used for controlling the rotational speed of the circulating water pump 2. A water outlet of the circulating water pump 2 is connected with the first pressure sensor 3 and the water inlet valve 11 in sequence through pipelines and is then connected with the filtration water inlet 41 of the regenerative filter 4, and the control device can control the opening and closing states of the water inlet valve 11.

[0017] The regenerative filter 4 includes a filtering tank 40. A filtration chamber 42 and a water purification chamber 43 are formed in the filtering tank 40. The regenerative filter 4 also includes a plurality of filter element hoses located in the filtration chamber 42 and a plurality of spray pipes 421 distributed between the filter element hoses. A water outlet of the filter element hose communicates with the water purification chamber 43. The external circulation water outlet 44 and a closed loop pre-coat water outlet 45 are formed in the filtering tank 40 and communicate with the water purification chamber 43. The filtration water inlet 41 is formed in the filtering tank 40 and communicates with the filtration chamber 42. A dual-purpose water vapor port 46 communicating with the filtration chamber 42 and an exhaust port 47 which communicates with the water purification chamber 43 and is used for exhausting gas are also formed in the filtering tank 40. An inner end of the dual-purpose water vapor port 46 is connected with the spray pipe 421, and an outer end of the dual-purpose water vapor port 46 is divided into two paths. An air injection port formed in one of the paths is used for outside air injection. The exhaust port 47 is in pipe connection with the exhaust port valve 12.

[0018] When the regenerative filtration system enters the regenerative mode, the control device can control the water inlet valve 11 to close and the exhaust port valve 12 to open. Meanwhile, outside air is injected into the filtering tank 40 from the dual-purpose water vapor port 46, ejected from the spray pipe 421, and exhausted from the exhaust port 47. When the regenerative filtration system enters the closed loop pre-coat mode or the external circulation filtration mode, the control device controls the water inlet valve 11 to open and the exhaust port valve 12 to close.

[0019] As a preferred embodiment, it is further restricted that the automatic filtration system also includes a closed loop pre-coat pipeline module 6 for conveying the pool water from the closed loop pre-coat water outlet 45 of the regenerative filter 4 into the regenerative filter 4 again through the circulating water pump 2 for filtration and purification again, an external circulation pipeline module 7 for returning the filtered water to the pool 10 from the external circulation water outlet 44 of the regenerative filter 4, a transparent water pipe 13, a closed loop pre-coat valve 14, a three-way joint 15 and an external circulation valve 16. One end of the pipeline module 6 is in pipe connection with the closed loop pre-coat water outlet 45 of the regenerative filter 4, and the other end of the closed loop pre-coat pipeline module 6 is connected with one end of the transparent water pipe 13. The other end of the transparent water pipe 13 is connected with a first port of the three-way joint 15 through the closed loop pre-coat valve 14. A second port of the three-way joint 15 is connected with a water outlet of a pre-filter 1, and a third port of the three-way joint 15 is connected with a water inlet of the circulating water pump 2.

[0020] One end of the external circulation pipeline module 7 is in pipe connection with the second pressure sensor 5, the external circulation valve 16 and the external circulation water outlet 44 of the regenerative filter 4 in sequence.

[0021] When the regenerative filtration system enters the closed loop pre-coat mode, the control device controls the closed loop pre-coat valve 14 to open and the external circulation valve 16 to close. When the regenerative filtration system enters the external circulation mode, the control device controls the closed loop pre-coat valve 14 to close and simultaneously the external circulation valve 16 to open.

[0022] As a preferred embodiment, it is restricted that the automatic filtration system also includes a flushing medium valve 17, a vacuum powder suction machine 18, a medium suction valve 19, an air suction valve 20 and a drain port valve 21. Another path at the outer end of the dual-purpose water vapor port 46 is in pipe connection with the flushing medium valve 17. A connecting pipe between the circulating water pump 2 and the first pressure sensor 3 is also provided with a shunt pipe and connected with the flushing medium valve 17. The control device can control the opening and closing states of the flushing medium valve 17.

[0023] A drain port 48 is formed in the bottom of the filtering tank 40. The drain port 48 is in pipe connection with the drain port valve 21. A medium suction inlet 49 communicating with the filtration chamber 42 is also formed in the filtering tank 40. The medium suction inlet 49 is externally connected with a medium replenishment device 22 through the medium suction valve 19 and a pipe. The vacuum powder suction machine 18 is in pipe connection with the air suction valve 20 and the exhaust port 47 in sequence through pipelines.

[0024] The medium replacement mode includes the following operation steps:

[0025] step Si, self-cleaning the filtering tank; after the control device controls the drain port valve 21 to drain water, the control device controls the flushing medium valve 17 to open, so that the pool water is ejected from the spray pipe 421 to flush and shake off the perlite powder on the filter element hose, and the shaken perlite powder and sewage are drained from the drain port 48;

[0026] step S2, adding a medium; the control device controls the flushing medium valve 17 and the drain port valve 21 to close, the control device controls the medium suction valve 19 and the air suction valve 20 to open, the control device controls the vacuum powder suction machine 18 to work to suck air into the filtering tank 40 to form a negative pressure environment in the filtering tank 40, and the perlite powder in the medium replenishment device 22 enters into the filtration chamber 42 from the medium suction inlet 49;

[0027] step S3, water filling; the control device controls the medium suction valve 19 and the air suction valve 20 to close, and the control device controls the water inlet valve 11 and the exhaust port valve 12 to open and controls the circulating water pump 2 to work for water filling in the filtering tank 40; and

[0028] step S4, switching the mode; the medium replacement mode is completed after the fills in the filtering tank 40, the regenerative filtration system automatically re-enters the closed loop pre-coat mode and the external circulation filtration mode in sequence, and fresh perlite powder is adhered to the filter element hose in the closed loop pre-coat mode.

[0029] A regenerative filtration system includes:

[0030] a pre-filter 1, used for pre-treating and filtering pool water sucked into a circulating water pump 2 to filter the large debris in the pool water;

[0031] a circulating water pump 2, used for conveying the pool water into a regenerative filter 4;

[0032] a water pump speed-regulating frequency converter, connected with the circulating water pump 2 and used for controlling the rotational speed of the circulating water pump 2;

[0033] a first pressure sensor 3, used for detecting the inlet water pressure of a filtration water inlet 41 of the regenerative filter 4;

[0034] a regenerative filter 4, used for filtering and purifying the pool water;

[0035] a second pressure sensor 5, used for detecting the outlet water pressure of an external circulation water outlet 44 of the regenerative filter 4;

[0036] a closed loop pre-coat pipeline module 6, used for conveying the pool water from the closed loop pre-coat water outlet 45 of the regenerative filter 4 into the regenerative filter 4 again through the circulating water pump 2 forfiltration and purification again;

[0037] an external circulation pipeline module 7, used for returning the filtered water to the pool 10 from the external circulation water outlet 44 of the regenerative filter 4; one end of the external circulation pipeline is in pipe connection with the external circulation water outlet 44 of the regenerative filter 4, and the other end of the external circulation pipeline is in pipe connection with the pool 10;

[0038] a water quality monitoring module 8, used for detecting water quality in the pool 10 or water quality in the external circulation water outlet 44 of the regenerative filter 4;

[0039] a dosing module 9, used for dosing chemicals into the pool 10 to adjust the water quality;

[0040] a control device, used for controlling the opening and closing states of the circulating water pump 2, the opening and closing states of the closed loop pre-coat pipeline module 6, the opening and closing states of the external circulation pipeline module 7 and the working state of the dosing module 9; the first pressure sensor 3, the second pressure sensor 5 and the water quality monitoring module 8 are electrically connected with the control device;

[0041] a human-machine interaction interface, electrically connected with the control device and used for manually controlling and adjusting the operating parameters of the regenerative filtration system;

[0042] After being started, the automatic filtration control system enters the closed loop pre coat mode, the circulating water pump 2 the closed loop pre-coat pipeline module 6 are opened to perform closed loop pre-coat purification on the pool water.

[0043] After the closed loop pre-coat mode reaches preset time, the system enters the external circulation filtration mode, the closed loop pre-coat pipeline module 6 is closed and the external circulation pipeline module 7 is opened to send the filtered and purified pool water into the pool 10. The control device analyzes a detection signal of the water quality monitoring module 8 and then controls the dosing module 9 to dose the chemicals.

[0044] The inlet water pressure detected by the first pressure sensor 3 is X and the outlet water pressure detected by the second pressure sensor 5 is Y. When X-Y| is greater than or equal to 50, the control device controls the circulating water pump 2 to stop and enter the regeneration mode.

[0045] As a preferred embodiment, it is further restricted that the system also includes a water inlet valve 11 and an exhaust port valve 12. A water outlet of the circulating water pump 2 is connected with the first pressure sensor 3 and the water inlet valve 11 in sequence through pipelines and is then connected with the filtration water inlet 41 of the regenerative filter 4, and the control device can control the opening and closing states of the water inlet valve 11.

[0046] The regenerative filter 4 includes a filtering tank 40. A filtration chamber 42 and a water purification chamber 43 are formed in the filtering tank 40. The regenerative filter 4 also includes a plurality of filter element hoses located in the filtration chamber 42 and a plurality of spray pipes 421 distributed between the filter element hoses. A water outlet of the filter element hose communicates with the water purification chamber 43. The external circulation water outlet 44 and a closed loop pre-coat water outlet 45 are formed in the filtering tank 40 and communicate with the water purification chamber 43. The filtration water inlet 41 is formed in the filtering tank 40 and communicates with the filtration chamber 42. A dual-purpose water vapor port 46 communicating with the filtration chamber 42 and an exhaust port 47 which communicates with the water purification chamber 43 and is used for exhausting gas are also formed in the filtering tank 40. An inner end of the dual-purpose water vapor port 46 is connected with the spray pipe 421, and an outer end of the dual-purpose water vapor port 46 is divided into two paths. An air injection port formed in one of the paths is used for outside air injection. The exhaust port 47 is in pipe connection with an exhaust port valve 12. When the regenerative filtration system enters the regenerative mode, outside air is injected into the filtering tank 40 from the dual-purpose water vapor port 46 and ejected from the spray pipe 421, and the air is exhausted from the exhaust port 47.

[0047] As a preferred embodiment, it is further restricted that the system also includes a transparent water pipe 13, a closed loop pre-coat valve 14, a three-way joint 15 and an external circulation valve 16. One end of the closed loop pre-coat pipeline module 6 is in pipe connection with the closed loop pre-coat water outlet 45 of the regenerative filter 4, and the other end of the closed loop pre-coat pipeline module 6 is connected with one end of the transparent water pipe 13. The other end of the transparent water pipe 13 is connected with a first port of the three-way joint 15 through the closed loop pre-coat valve 14. A second port of the three-way joint 15 is connected with a water outlet of the pre-filter 1. A third port of the three-way joint 15 is connected with a water inlet of the circulating water pump 2. The control device can control the opening and closing states of the closed loop pre-coat valve 14.

[0048] One end of the external circulation pipeline module 7 is in pipe connection with the second pressure sensor 5, the external circulation valve 16 and the external circulation water outlet 44 of the regenerative filter 4 in sequence. The control device can control the opening and closing states of the external circulation valve 16.

[0049] When the regenerative filtration system enters the closed loop pre-coat mode, the closed loop pre-coat valve 14 is opened and the external circulation valve 16 is closed. When the regenerative filtration system enters the external circulation mode, the closed loop pre-coat valve

14 is closed and the external circulation valve 16 is opened.

[0050] As a preferred embodiment, it is restricted that the system also includes a flushing medium valve 17, a vacuum powder suction machine 18, a medium suction valve 19, an air suction valve 20 and a drain port valve 21. Another path at the outer end of the dual-purpose water vapor port 46 is in pipe connection with the flushing medium valve 17. A connecting pipe between the circulating water pump 2 and the first pressure sensor 3 is also provided with a shunt pipe and connected with the flushing medium valve 17. The control device can control the opening and closing states of the flushing medium valve 17.

[0051] A drain port 48 is formed in the bottom of the filtering tank 40. The drain port 48 is in pipe connection with the drain port valve 21. A medium suction inlet 49 communicating with the filtration chamber 42 is also formed in the filtering tank 40. The medium suction inlet 49 is externally connected with a medium replenishment device 22 through the medium suction valve 19 and a pipe. The vacuum powder suction machine 18 is in pipe connection with the air suction valve 20 and the exhaust port 47 in sequence through pipelines.

[0052] As a preferred embodiment, it is further restricted that the system also includes at least one air compressor 23. The water inlet valve 11, the flushing medium valve 17, the closed loop pre-coat valve 14, the external circulation valve 16, the exhaust port valve 12, the medium suction valve 19 and/or the drain port valve 21 are pneumatic valves, and are all pneumatic valves. The control device supplies or disconnect air for the water inlet valve 11, the flushing medium valve 17, the closed loop pre-coat valve 14, the external circulation valve 16, the exhaust port valve 12, the medium suction valve 19 and/or the drain port valve 21 which are pneumatic valves through the air compressor 23 to realize the control for the switching state.

[0053] The present disclosure has the following beneficial effects.

[0054] Firstly, the regenerative filtration system has a closed loop pre-coat mode, an external circulation filtration mode, a regenerative mode and a medium replacement mode. After the system is started, a control device controls the system to enter the closed loop pre-coat mode, and the system enters the external circulation filtration mode after the closed loop pre-coat mode reaches preset time. The control device detects the water quality in a pool or the water quality of an external circulation water outlet of a regenerative filter through a water quality monitoring module and analyzes whether the water quality meets water quality standard requirements. If the water quality does not meet the water quality standard requirements, a dosing module is controlled to dose chemicals into the pool to adjust the water quality. The water quality can be detected while filtering, and the chemicals can be dosed according to the water quality, so that the water quality can reach a stable state.

[0055] Secondly, the regenerative filter does not need backwashing, and the filter medium can be recycled until being used up. When the regenerative filter system runs to preset accumulated working time or preset timing time, the system enters the regenerative mode. The control device respectively detects and collects the inlet water pressure X of a filtration water inlet of the regenerative filter and the outlet water pressure Y of a filtration water outlet of the regenerative filter through a first pressure sensor and a second pressure sensor. When X-Y| is greater than or equal to Z and Z is 50+/-5, it is judged that the system is necessary to enter the medium replacement mode to replace perlite powder in the regenerative filter. The system actually controls the automatic operation of a whole filtration process through the data of various valves, water flow rate, water pressure and air pressure. The different modes are automatically switched for operation, and recycling for the filter medium is realized. The filter does not need backwashing, and the filter medium can be recycled until being used up, so that the effect of energy saving is achieved.

[0056] Thirdly, the filtration system is provided with a water pump speed-regulating frequency converter which can control the operating speed of the water pump. Different water flow rate requirements can be met in a filtration process, and the rotational speed can also be reduced in small load, so that the effect of energy saving is achieved.

[0057] Fourthly, the filtration speed (flow rate) of the regenerative filtration system is designed 3 /m2 /h (per cubic meter/per square meter/per hour). The slower the filtration to be 1.22 to 3m speed, the higher the filtration accuracy is.

BRIEF DESCRIPTION OF THE DRAWINGS

[0058] FIG. 1 is a first local structural schematic diagram of afiltration system.

[0059] FIG. 2 is a structural chart of afiltration system.

[0060] FIG. 3 is an enlarged structural schematic diagram of part A in FIG. 2.

[0061] FIG. 4 is an enlarged structural schematic diagram of part B in FIG. 2.

[0062] FIG. 5 is a first structural schematic diagram of a regenerative filter.

[0063] FIG. 6 is a second structural schematic diagram of a regenerative filter.

[0064] FIG. 7 is a structural schematic diagram of a spray pipe.

[0065] FIG. 8 is a second local structural schematic diagram of a filtration system.

[0066] FIG. 9 is a third local structural schematic diagram of a filtration system.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0067] The present invention is further described in detail in conjunction with the following attached figures and embodiments.

[0068] As shown in FIG. 1 to FIG. 9, disclosed is a control method of a regenerative filtration system. The regenerative filtration system has one or more of a closed loop pre-coat mode, an external circulation filtration mode, a regenerative mode and a medium replacement mode. After the regenerative filtration system is started, a control device controls the system to enter the closed loop pre-coat mode, and the system enters the external circulation filtration mode after the closed loop pre-coat mode reaches preset time. The control device detects the water quality in a pool 10 or the water quality of an external circulation water outlet 44 of a regenerative filter 4 through a water quality monitoring module 8 and analyzes whether the water quality meets water quality standard requirements. In the embodiment, as shown in FIG. 2 and FIG. 4, the control device detects the water quality of the external circulation water outlet 44 of the regenerative filter 4 through the water quality monitoring module 8. Further, an external circulation pipeline module 7 is in pipe connection for detection. If the water quality does not meet the water quality standard requirements, a dosing module 9 is controlled to dose chemicals into the pool 10 to adjust the water quality. The water quality can be detected while filtering, and the chemicals can be dosed according to the water quality, so that the water quality can reach a stable state.

[0069] In the embodiment, the regenerative filtration system enters the regenerative mode when operating to preset cumulated working time or preset timing time. In the regenerative mode, perlite powder is shaken off from filter element hoses, the system re-enters the closed loop pre coat mode and the external circulation filtration mode in sequence after the regenerative mode reaches preset time, and the shaken perlite powder is adhered to the filter element hoses in the closed loop pre-coat mode.

[0070] In the embodiment, in order to prevent the regenerative filter from being exploded by excessive internal pressure of the regenerative filter, the control device respectively detects and collects the inlet water pressure X of a filtration water inlet 41 of the regenerative filter 4 and the outlet water pressure Y of a filtration water outlet 44 of the regenerative filter 4 through a first pressure sensor 3 and a second pressure sensor 5, and the unit of the water pressure is kPa. When X-Y| is greater than or equal to Z and Z is 50+/-5, it is judged that the system is necessary to enter the medium replacement mode to replace perlite powder in the regenerative filter 4. After the medium replacement mode is finished, the system re-enters the closed loop pre-coat mode and the external circulation filtration mode in turn, and the shaken pearlite powder is adhered to the filter element hoses in the closed loop pre-coat mode. In the embodiment, the particle size of the perlite powder is less than or equal to 200 meshes, which can meet the filtration requirements.

[0071] In the embodiment, the analysis of whether the water quality meets the water quality standard requirements is to perform at least one of the following judgments:

[0072] judgment P1, whether the redox potential (ORP) is greater than or equal to 650 mV;

[0073] judgment P2, whether the potential of hydrogen (pH value) is between 7.2 and 7.8.

[0074] The dosing module 9 doses water quality treatment substances into the pool 10, and the water quality treatment substances include chlorine-containing disinfectants and pH regulators. Further, the chlorine-containing disinfectants include sodium hypochlorite, calcium hypochlorite, trisodium chlorophosphate, 84 disinfectant, bleaching powder, trichloroisocyanate tablets, sodium dichloroisocyanurate, trichloroisocyanuric acid, ammonium chloride T and the like, or substitute chemicals with the same efficacy in the prior art. Preferably, sodium hypochlorite is used.

[0075] When the ORP is less than 650 mV, the control device controls the dosing module 9 to dose the chlorine-containing disinfectants into the pool 10. Preferably, sodium hypochlorite is dosed.

[0076] When the pH is greater than 7.8, the control device controls the dosing module 9 to dose the pH regulators into the pool 10. The pH regulators include but not limited to hydrochloric acid and sodium bicarbonate, or substitute chemicals with the same efficacy in the prior art, such as hypochlorous acid, sodium hydroxide and sodium carbonate.

[0077] In the embodiment, when the ORP is less than 650 mV, the control device controls the dosing module 9 to dose sodium hypochlorite into the pool 10, and the sodium hypochlorite can improve the redox potential. When the pH is greater than 7.8, the control device controls the dosing module 9 to dose hydrochloric acid and/or sodium bicarbonate into the pool 10. Further, generally, after a swimming pool is put into use, sodium hypochlorite is used for adjustment, but the PH value always rises. Hydrochloric acid can neutralize the increase of the PH value caused by sodium hypochlorite, but if the PH value is always greater than 7.8, it is necessary to dose a certain amount of hydrochloric acid to control the PH value below 7.5, and then a certain amount of sodium bicarbonate is dosed to stabilize the water quality. And then, the dosing of sodium hypochlorite is started again. According to the amount of pool water in the swimming pool, the corresponding amount can be found in a set program of the control device.

[0078] In the embodiment, the regenerative filtration system includes a circulating water pump 2 for conveying pool water into the regenerative filter 4, a water pump speed-regulating frequency converter, a water inlet valve 11 and an exhaust port valve 12. The water pump speed regulating frequency converter is connected with the circulating water pump 2. The water pump speed-regulating frequency converter can control the operating speed of the circulating water pump 2. Different water flow rate requirements can be met in a filtration process, and the rotational speed can also be reduced in small load, so that the effect of energy saving is achieved. A water outlet of the circulating water pump 2 is connected with the first pressure sensor 3 and the water inlet valve 11 in sequence through pipelines and is then connected with the filtration water inlet 41 of the regenerative filter 4, and the control device can control the opening and closing states of the water inlet valve 11. The regenerative filter 4 includes a filtering tank 40, and a filtration chamber 42 and a water purification chamber 43 are formed in the filtering tank 40. The regenerative filter 4 also includes a plurality of filter element hoses located in the filtration chamber 42 and a plurality of spray pipes 421 distributed between the filter element hoses. A water outlet of thefilter element hose communicates with the water purification chamber 43. The external circulation water outlet 44 and a closed loop pre-coat water outlet 45 are formed in the filtering tank 40 and communicate with the water purification chamber 43. The filtration water inlet 41 is formed in the filtering tank 40 and communicates with the filtration chamber 42. A dual-purpose water vapor port 46 communicating with the filtration chamber 42 and an exhaust port 47 which communicates with the water purification chamber 43 and is used for exhausting gas are also formed in the filtering tank 40. An inner end of the dual-purpose water vapor port 46 is connected with the spray pipe 421, and an outer end of the dual-purpose water vapor port 46 is divided into two paths. An air injection port formed in one of the paths is used for outside air injection. The exhaust port 47 is in pipe connection with an exhaust port valve 12. When the regenerative filtration system enters the regenerative mode, the control device can control the water inlet valve 11 to close and the exhaust port valve 12 to open. At the same time, outside air is injected into the filtering tank 40 from the dual-purpose water vapor port 46 and ejected from the spray pipe 421, so that the perlite powder is shaken off, and then the air is exhausted from the exhaust port 47. Wen the recycling system enters the closed loop pre coat mode or the external circulation filtration mode, the control device controls the water inlet valve 11 to open and the exhaust port valve 12 to close. In the embodiment, a first check valve 101, a first gear butterfly valve 102, a water meter switch 103, an electromagnetic water flow meter 104, a first temperature probe 105 and a first pressure gage 106 are also in pipe connection in sequence between the water outlet of the circulating water pump 2 and the first pressure sensor 3. The electromagnetic water flow meter 104 is a full-port electromagnetic water flow meter, and the electromagnetic water flow meter 104 can detect the water flow speed of the pool water. The first check valve 101 can prevent backflow of pool water, and the first gear butterfly valve 102 can be manually closed in case of emergency. The system realizes automatic control through the data of various valves, water flow rate, water pressure and air pressure.

[0079] In the embodiment, the automatic filtration system also includes a closed loop pre-coat pipeline module 6 for conveying the pool water from the closed loop pre-coat 45 of the regenerative filter 4 into the regenerative filter 4 again through the circulating water pump 2 for filtration and purification again, an external circulation pipeline module 7 for returning the filtered water to the pool 10 from the external circulation water outlet 44 of the regenerative filter 4, a transparent water pipe 13, a closed loop pre-coat valve 14, a three-way joint 15 and an external circulation valve 16. One end of the closed loop pre-coat pipeline module 6 is in pipe connection with the closed loop pre-coat water outlet 45 of the regenerative filter 4, and the other end of the closed loop pre-coat pipeline module 6 is connected with one end of the transparent water pipe 13. The other end of the transparent water pipe 13 is connected with a first port of the three-way joint 15 through the closed loop pre-coat valve 14, a second port of the three-way joint 15 is connected with a water outlet of a pre-filter 1, and a third port of the three-way joint 15 is connected with a water inlet of the circulating water pump 2. One end of the external circulation pipeline module 7 is connected with the second pressure sensor 5, the external circulation valve 16 and the external circulation water outlet 44 of the circulation regeneration filter 4 in turn. When the regenerative filtration system enters the closed loop pre-coat mode, the control device controls the closed loop pre-coat valve 14 to open and simultaneously controls the external circulation valve 16 to close. When the regenerative filtration system enters the external circulation filtration mode, the control device controls the closed loop pre-coat valve 14 to close and the external circulation valve 16 to open. In the embodiment, a second gear butterfly valve 107 is also in pipe connection between the closed loop pre-coat valve 14 and the three-way joint 15. A second pressure gage 108 is also in pipe connection between the second pressure sensor 5 and the external circulation valve 16 for detecting pressure. The system realizes automatic control through the data of various valves, water flow rate, water pressure and air pressure.

[0080] In the embodiment, the automatic filtration system also includes a flushing medium valve 17, a vacuum powder suction machine 18, a medium suction valve 19, an air suction valve 20 and a drain port valve 21. Another path at the outer end of the dual-purpose water vapor port 46 is in pipe connection with the flushing medium valve 17. In the embodiment, a third check valve 110 is also in pipe connection between another path at the outer end of the dual-purpose water vapor port 46 and the flushing medium valve 17, and the third check valve 110 can prevent backflow of pool water. A connecting pipe between the circulating water pump 2 and the first pressure sensor 3 is also provided with a shunt pipe and connected with the flushing medium valve 17, and the control device can control the opening and closing states of the flushing medium valve 17. A drain port 48 is formed in the bottom of the filtering tank 40. The drain port 48 is in pipe connection with the drain port valve 21. A medium suction inlet 49 communicating with the filtration chamber 42 is also formed in the filtering tank 40. The medium suction inlet 49 is externally connected with a medium replenishment device 22 through the medium suction valve 19 and a pipe. The vacuum powder suction machine 18 is in pipe connection with the air suction valve 20 and the exhaust port 47 in sequence through pipelines. Two observation windows 400 are formed in the filtering tank 40. When it is observed that the medium needs to be replaced, an operator can click on a man-machine interaction interface to switch to the medium replacement mode, or the system can automatically run the medium replacement mode after the system sets the regenerative mode to run for several times, or the system can automatically run the medium replacement mode after the perlite powder is used for some time. The perlite powder in the filtering tank 40 is replaced in the medium replacement mode. The system automatically runs the steps in the medium replacement mode, and the medium replacement mode includes the following operation steps:

[0081] step Si, self-cleaning the filtering tank; after the control device controls the drain port valve 21 to drain water, the control device controls the flushing medium valve 17 to open, so that the pool water is ejected from the spray pipe 421 to flush and shake off the perlite powder on the filter element hose, and the shaken pearlite powder and sewage are drained from the drain port 48;

[0082] step S2, adding a medium; the control device controls the flushing medium valve 17 and the drain port valve 21 to close, the control device controls the medium suction valve 19 and the air suction valve 20 to open, the control device controls the vacuum powder suction machine 18 to work to suck air into the filtering tank 40 to form a negative pressure environment in the filtering tank 40, and the perlite powder in the medium replenishment device 22 enters into the filtration chamber 42 from the medium suction inlet 49;

[0083] step S3, water filling; the control device controls the medium suction valve 19 and the air suction valve 20 to close, and the control device controls the water inlet valve 11 and the exhaust port valve 12 to open and controls the circulating water pump 2 to work for water filling in the filtering tank 40; and

[0084] step S4, switching the mode; the medium replacement mode is completed after the fills in the filtering tank 40, the regenerative filtration system automatically re-enters the closed loop pre-coat mode and the external circulation filtration mode in sequence, and fresh perlite powder is adhered to the filter element hose in the closed loop pre-coat mode.

[0085] The system automatically runs the above steps to realize the automatic replacement of the perlite powder medium. Since the size of the regenerative filter 4 affects the time of each link, the time is not specifically disclosed. Those skilled in the art can obtain reasonable time through a limited number of experiments according to the size of the regenerative filter 4. In the embodiment, two or more regenerative filtration systems are also controlled by one control device, and can be used when the pool 10 is large.

[0086] As shown in FIG. 1 to FIG. 9, a regenerative filtration system includes:

[0087] a pre-filter 1, used for pre-treating and filtering pool water sucked into a circulating water pump 2 to filter the large debris in the pool water; the pre-filter 1 can be a hair pre-filter for a recycling medium filter device (with the notification number of CN218011534U) previously applied by an applicant;

[0088] a circulating water pump 2, used for conveying the pool water into a regenerative filter 4;

[0089] a water pump speed-regulating frequency converter, connected with the circulating water pump 2 and used for controlling the rotational speed of the circulating water pump 2;

[0090] a first pressure sensor 3, used for detecting the inlet water pressure of a filtration water inlet 41 of the regenerative filter 4; in this embodiment, the first pressure sensor 3 can be a pressure transmitter (throw-in type level gage) or a diffused silicon pressure transmitter or a pressure sensor commonly used in the prior art;

[0091] a regenerative filter 4, used for filtering and purifying the pool water; in the embodiment, the regenerative filter 4 can be a filter device capable of regenerating and recycling a filter medium previously applied by an applicant (with the notification number of CN211585578U) or a perlite powder recycling medium filter device (with the notification number of CN218011535U);

[0092] a second pressure sensor 5, used for detecting the outlet water pressure of an external circulation water outlet 44 of the regenerative filter 4; in the embodiment, the second pressure sensor 5 can be a pressure transmitter (throw-in type level gage) or a diffused silicon pressure transmitter or a pressure sensor commonly used in the prior art;

[0093] a closed loop pre-coat pipeline module 6, used for conveying the pool water from the closed loop pre-coat water outlet 45 of the regenerative filter 4 into the regenerative filter 4 again through the circulating water pump 2 forfiltration and purification again;

[0094] an external circulation pipeline module 7, used for returning the filtered water to the pool 10 from the external circulation water outlet 44 of the regenerative filter 4; one end of the external circulation pipeline is in pipe connection with the external circulation water outlet 44 of the regenerative filter 4, and the other end of the external circulation pipeline is in pipe connection with the pool 10;

[0095] a water quality monitoring module 8, used for detecting water quality in the pool 10 or water quality in the external circulation water outlet 44 of the regenerative filter 4;

[0096] a dosing module 9, used for dosing chemicals into the pool 10 to adjust the water quality; the dosing module 9 used in the embodiment can be a dosing mechanism (with the notification number of CN218320812U) previously applied by an applicant;

[0097] a control device, used for controlling the opening and closing states of the circulating water pump 2, the opening and closing states of the closed loop pre-coat pipeline module 6, the opening and closing states of the external circulation pipeline module 7 and the working state of the dosing module 9; the first pressure sensor 3, the second pressure sensor 5 and the water quality monitoring module 8 are electrically connected with the control device; in the embodiment, the control device can be a PLC automatic control device, and can also be a PCB (Printed Circuit Board); the PLC automatic control device is high in expandability, and the PCB is low in cost;

[0098] a human-machine interaction interface, electrically connected with the control device and used for manually controlling and adjusting the operating parameters of the regenerative filtration system; in the embodiment, the human-machine interaction interface can be an HMI (Human Machine Interface) touch screen.

[099] After being started, the automatic filtration control system enters the closed loop pre-coat mode, the circulating water pump 2 and the closed loop pre-coat pipeline module 6 are opened to perform closed loop pre-coat purification on the pool water. After the closed loop pre-coat mode reaches preset time, the system enters the external circulation filtration mode, the closed loop pre-coat pipeline module 6 is closed and the external circulation pipeline module 7 is opened to send the filtered and purified pool water into the pool 10. The control device analyzes a detection signal of the water quality monitoring module (8) and then controls the dosing module 9 to dose the chemicals.

[0100] The regenerative filtration system enters the regenerative mode when operating to preset cumulated working time or preset timing time. In the regenerative mode, perlite powder is shaken off from filter element hoses, the system re-enters the closed loop pre-coat mode and the external circulation filtration mode in sequence after the regenerative mode reaches preset time, and the shaken perlite powder is adhered to the filter element hoses in the closed loop pre-coat mode.

[0101] The inlet water pressure detected by the first pressure sensor 3 is X, and the outlet water pressure detected by the second pressure sensor 5 is Y. When X-Y| is greater than or equal to 50, the control device controls the circulating water pump 2 to stop to enter the regeneration mode so as to replace the perlite powder in the regenerative filter 4; after the medium replacement mode is finished, the system re-enters the closed loop pre-coat mode and the external circulation filtration mode in sequence, and the shaken pearlite powder is adhered to the filter element hoses in the closed loop pre-coat mode. In the embodiment, the particle size of the perlite powder is less than or equal to 200 meshes, which meets the filtration requirements.

[0102] In the embodiment, the system also includes a water inlet valve 11, an exhaust port valve 12, a first check valve 101, a first gear butterfly valve 102, a water meter switch 103, an electromagnetic water flow meter 104, a first temperature probe 105 and a first pressure gage 106. A water outlet of the circulating water pump 2 is connected with the first check valve 101, the first gear butterfly valve 102, the water meter switch 103, the electromagnetic water flow meter 104, the first temperature probe 105, the first pressure gage 106, the first pressure sensor 3 and the water inlet valve 11 in sequence through pipelines and is then connected with the filtration water inlet 41 of the regenerative filter 4. The control device can control the opening and closing states of the water inlet valve 11. The electromagnetic water flow meter 104 is a full port electromagnetic water flow meter, and the electromagnetic water flow meter 104 can detect the water flow speed of the pool water. The first check valve 101 can prevent backflow of pool water, and the first gear butterfly valve 102 can be manually closed in case of emergency. The system realizes automatic control through the data of various valve, water flow rate, water pressure and air pressure. The regenerative filter 4 includes a filtering tank 40. A filtration chamber 42 and a water purification chamber 43 are formed in the filtering tank 40. The regenerative filter 4 also includes a plurality of filter element hoses located in the filtration chamber 42 and a plurality of spray pipes 421 distributed between the filter element hoses. A water outlet of the filter element hose communicates with the water purification chamber 43. The external circulation water outlet 44 and a closed loop pre-coat water outlet are formed in the filtering tank 40 and communicate with the water purification chamber 43. The filtration water inlet 41 is formed in the filtering tank 40 and communicates with the filtration chamber 42. A dual-purpose water vapor port 46 communicating with the filtration chamber 42 and an exhaust port 47 which communicates with the water purification chamber 43 and is used for exhausting gas are also formed in the filtering tank 40. An inner end of the dual-purpose water vapor port 46 is connected with the spray pipe 421, and an outer end of the dual-purpose water vapor port 46 is divided into two paths. An air injection port formed in one of the paths is used for outside air injection. The exhaust port 47 is in pipe connection with an exhaust port valve 12. When the regenerative filtration system enters the regenerative mode, outside air is injected into the filtering tank 40 from the dual-purpose water vapor port 46 and ejected from the spray pipe 421, so that the perlite powder is shaken off, and the air is exhausted from the exhaust port 47. When the regenerative filtration system enters the closed loop pre-coat mode or the external circulation filtration mode, the control device controls the water inlet valve 11 to open and the exhaust port valve 12 to close. In the embodiment, the water pump speed-regulating frequency converter can control the operating speed of the circulating water pump 2. Different water flow rate requirements can be met in a filtration process, and the rotational speed can also be reduced in small load, so that the effect of energy saving is achieved.

[0103] In this embodiment, the automatic filtration system further includes a transparent water pipe 13, a closed loop pre-coat valve 14, a three-way joint 15, an external circulation valve 16, a second gear butterfly valve 107, a second pressure gage 108 and a second check valve 10. One end of the closed loop pre-coat pipeline module 6 is in pipe connection with the closed loop pre coat water outlet 45 of the regenerative filter 4, and the other end of the closed loop pre-coat pipeline module 6 is connected with one end of the transparent water pipe 13. The other end of the transparent water pipe 13 is in pipe connection with the closed loop pre-coat valve 14, the second gear butterfly valve 107 and a first port of the three-way joint 15 in sequence. The second gear butterfly valve 107 is used for manual closing in emergency situations to provide the safety performance of the system. A second port of the three-way joint 15 is connected with the second check valve 10 and a water outlet of the pre-filter 1 in sequence. The second check valve 109 can prevent backflow of pool water. The third joint of the three-way joint 15 is connected with the water inlet of the circulating water pump 2, and the control device can control the opening and closing states of the closed loop pre-coat valve 14. One end of the external circulation pipeline module 7 is connected with the second pressure sensor 5, the second pressure guage 108, the external circulation valve 16 and the external circulation water outlet 44 of the regenerative filter 4 in sequence. The second pressure gage 108 is used for displaying pressure for field observation. The other end of the external circulation pipeline module 7 is respectively in pipe connection with the water quality monitoring module 8, the dosing module 9 and the water pool 10. The control device can control the opening and closing states of the external circulation valve 16. When the regenerative filtration system enters the closed loop pre-coat mode, the closed loop pre-coat valve 14 is opened and the external circulation valve 16 is closed. When the regenerative filtration system enters the external circulation mode, the closed loop pre-coat valve 14 is closed and the external circulation valve 16 is opened. The system realizes automatic control through the data of various valves, water flow rate, water pressure and air pressure data.

[0104] In the embodiment, the automatic filtration system also includes a flushing medium valve 17, a vacuum powder suction machine 18, a medium suction valve 19, an air suction valve 20 and a drain port valve 21. Another path at the outer end of the dual-purpose water vapor port 46 is in pipe connection with the flushing medium valve 17. A connecting pipe between the circulating water pump 2 and the first pressure sensor 3 is also provided with a shunt pipe and connected with the flushing medium valve 17. The control device can control the opening and closing states of the flushing medium valve 17. A drain port 48 is formed in the bottom of the filtering tank 40. The drain port 48 is in pipe connection with the drain port valve 21. A medium suction inlet 49 communicating with the filtration chamber 42 is also formed in the filtering tank 40. The medium suction inlet 49 is externally connected with a medium replenishment device 22 through the medium suction valve 19 and a pipe. The vacuum powder suction machine 18 is in pipe connection with the air suction valve 20 and the exhaust port 47 in sequence through pipelines. Two observation windows 400 are formed in the filtering tank 40. When it is observed that the medium needs to be replaced, an operator can click on a man-machine interaction interface to switch to the medium replacement mode, or the system can automatically run the medium replacement mode after the system sets the regenerative mode to run for several times, or the system can automatically run the medium replacement mode after the perlite powder is used for some time. The perlite powder in the filtering tank 40 is replaced in the medium replacement mode. The system automatically runs the steps in the medium replacement mode, and the medium replacement mode includes the following operation steps:

[0105] step Si, self-cleaning the filtering tank; after the control device controls the drain port valve 21 to drain water, the control device controls the flushing medium valve 17 to open, so that the pool water is ejected from the spray pipe 421 to flush and shake off the perlite powder on the filter element hose, and the shaken pearlite powder and sewage are drained from the drain port 48;

[0106] step S2, adding a medium; the control device controls the flushing medium valve 17 and the drain port valve 21 to close, the control device controls the medium suction valve 19 and the air suction valve 20 to open, the control device controls the vacuum powder suction machine 18 to work to suck air into the filtering tank 40 to form a negative pressure environment in the filtering tank 40, and the perlite powder in the medium replenishment device 22 enters into the filtration chamber 42 from the medium suction inlet 49;

[0107] step S3, water filling; the control device controls the medium suction valve 19 and the air suction valve 20 to close, and the control device controls the water inlet valve 11 and the exhaust port valve 12 to open and controls the circulating water pump 2 to work for water filling in the filtering tank 40; and

[0108] step S4, switching the mode; the medium replacement mode is completed after the fills in the filtering tank 40, the regenerative filtration system automatically re-enters the closed loop pre-coat mode and the external circulation filtration mode in sequence, and fresh perlite powder is adhered to the filter element hose in the closed loop pre-coat mode.

[0109] The system automatically runs the above steps to realize the automatic replacement of the perlite powder medium. Since the size of the regenerative filter 4 affects the time of each link, the time is not specifically disclosed. Those skilled in the art can obtain reasonable time through a limited number of experiments according to the size of the regenerative filter 4.

[0110] The filtration speed (flow rate) of the regenerative filtration system is designed to be 1.22 to 3m3 /m2 /h (per cubic meter/per square meter/per hour), the designed filtration speed of a general sand cylinder filter design is 25 m3 /m2 /h, the designed filtration speed of a diatomite filter is 5-10 m3 /m2/h, and the filtration speed of a perlite powder regenerative filter is designed to be 1.22 to 4.65 m3 /m2 /h, and the filtration speed (flow rate) of the regenerative filtration 3 system in the application is designed to reach 1.22 to 3m /m2/h (per cubic meter/per square meter/per hour). The slower the filtration speed, the higher the filtration accuracy is and the better the filtration effect is.

[0111] In the embodiment, the automatic filtration system also includes at least one air compressor 23. The water inlet valve 11, the flushing medium valve 17, the closed loop pre-coat valve 14, the external circulation valve 16, the exhaust port valve 12, the medium suction valve 19 and/or the drain port valve 21 are pneumatic valves, and the control device supplies or disconnect air for the water inlet valve 11, the flushing medium valve 17, the closed loop pre coat valve 14, the external circulation valve 16, the exhaust port valve 12, the medium suction valve 19 and/or the drain port valve 21 which are pneumatic valves through the air compressor 23 to realize the control for the switching state. The water inlet valve 11, the flushing medium valve 17, the closed loop pre-coat valve 14, the external circulation valve 16, the exhaust port valve 12, the medium suction valve 19 and the drain port valve 21 are all pneumatic valves. The degree of automatic control is high, but other common valves, such as hand valves and electromagnetic valves, can also be used in the prior art according to customer needs.

[0112] The regenerative filtration system can also be connected to a UV disinfection system, an ozone disinfection system, a heating system, a liquid level monitoring system, a lighting control system, a remote monitoring system, and the like. All the systems can be managed and controlled by control devices.

Claims

CLAIMS WHAT IS CLAIMED IS:

1. A control method of a regenerative filtration system, wherein the has one or more of a closed loop pre-coat mode, an external circulation filtration mode, a regenerative mode and a medium replacement mode; after the regenerative filtration system is started, a control device controls the system to enter the closed loop pre-coat mode, and the system enters the external circulation filtration mode after the closed loop pre-coat mode reaches preset time; the control device detects the water quality in a pool (10) or the water quality of an external circulation water outlet (44) of a regenerative filter (4) through a water quality monitoring module (8) and analyzes whether the water quality meets water quality standard requirements; if the water quality does not meet the water quality standard requirements, a dosing module (9) is controlled to dose chemicals into the pool (10) to adjust the water quality; the regenerative filtration system enters the regenerative mode when operating to preset cumulated working time or preset timing time; in the regenerative mode, perlite powder is shaken off from filter element hoses, the system re-enters the closed loop pre-coat mode and the external circulation filtration mode in sequence after the regenerative mode reaches preset time, and the shaken perlite powder is adhered to the filter element hoses in the closed loop pre-coat mode; the control device respectively detects and collects the inlet water pressure X of a filtration water inlet (41) of the regenerative filter (4) and the outlet water pressure Y of afiltration water outlet (44) of the regenerative filter (4) through a first pressure sensor (3) and a second pressure sensor (5); when X-Y| is greater than or equal to Z and Z is 50+/-5, it is judged that the system is necessary to enter the medium replacement mode to replace perlite powder in the regenerative filter (4); after the medium replacement mode is finished, the system re-enters the closed loop pre-coat mode and the external circulation filtration mode in sequence, and the shaken pearlite powder is adhered to the filter element hoses in the closed loop pre-coat mode.

2. The control method of a regenerative filtration system according to claim 1, wherein the regenerative filtration system comprises a circulating water pump (2) for conveying pool water into the regenerative filter (4), a water pump speed-regulating frequency converter, a water inlet valve (11) and an exhaust port valve (12), the water pump speed-regulating frequency converter is used for controlling the rotational speed of the circulating water pump (2), a water outlet of the circulating water pump (2) is connected with the first pressure sensor (3) and the water inlet valve (11) in sequence through pipelines and is then connected with the filtration water inlet (41) of the regenerative filter (4), and the control device can control the opening and closing states of the water inlet valve (11); the regenerative filter (4) comprises a filtering tank (40), a filtration chamber (42) and a water purification chamber (43) are formed in the filtering tank (40), the regenerative filter (4) also comprises a plurality of filter element hoses located in the filtration chamber (42) and a plurality of spray pipes (421) distributed between the filter element hoses, a water outlet of the filter element hose communicates with the water purification chamber (43), the external circulation water outlet (44) and a closed loop pre-coat water outlet (45) are formed in the filtering tank (40) and communicate with the water purification chamber (43), the filtration water inlet (41) is formed in the filtering tank (40) and communicates with thefiltration chamber (42), a dual-purpose water vapor port (46) communicating with the filtration chamber (42) and an exhaust port (47) which communicates with the water purification chamber (43) and is used for exhausting gas are also formed in the filtering tank (40), an inner end of the dual-purpose water vapor port (46) is connected with the spray pipe (421), an outer end of the dual-purpose water vapor port (46) is divided into two paths, an air injection port formed in one of the paths is used for outside air injection; the exhaust port (47) is in pipe connection with the exhaust port valve (12); when the regenerative filtration system enters the regenerative mode, the control device can control the water inlet valve (11) to close and the exhaust port valve (12) to open, and meanwhile, outside air is injected into the filtering tank (40) from the dual-purpose water vapor port (46), ejected from the spray pipe (421), and exhausted from the exhaust port (47); and when the regenerative filtration system enters the closed loop pre-coat mode or the external circulation filtration mode, the control device controls the water inlet valve (11) to open and the exhaust port valve (12) to close.

3. The control method of a regenerative filtration system according to claim 2, wherein the automatic filtration system also comprises a closed loop pre-coat pipeline module (6) for conveying the pool water from the closed loop pre-coat (45) of the regenerative filter (4) into the regenerative filter (4) again through the circulating water pump (2) for filtration and purification again, an external circulation pipeline module (7) for returning the filtered water to the pool 10 from the external circulation water outlet (44) of the regenerative filter (4) a transparent water pipe (13), a closed loop pre-coat valve (14), a three-way joint (15) and an external circulation valve (16), one end of the closed loop pre-coat pipeline module (6) is in pipe connection with the closed loop pre-coat water outlet (45) of the regenerative filter (4), the other end of the closed loop pre-coat pipeline module (6) is connected with one end of the transparent water pipe (13), the other end of the transparent water pipe (13) is connected with a first port of the three-way joint (15) through the closed loop pre-coat valve (14), a second port of the three-way joint (15) is connected with a water outlet of a pre-filter (1), and a third port of the three-way joint (15) is connected with a water inlet of the circulating water pump (2); one end of the external circulation pipeline module (7) is in pipe connection with the second pressure sensor (5), the external circulation valve (16) and the external circulation water outlet (44) of the regenerative filter (4) in sequence; when the regenerative filtration system enters the closed loop pre-coat mode, the control device controls the closed loop pre-coat valve (14) to open and the external circulation valve (16) to close; and when the regenerative filtration system enters the external circulation mode, the control device controls the closed loop pre-coat valve (14) to close and simultaneously the external circulation valve (16) to open.

4. The control method of a regenerative filtration system according to claim 3, wherein the automatic filtration system also comprises a flushing medium valve (17), a vacuum powder suction machine (18), a medium suction valve (19), an air suction valve (20) and a drain port valve (21), another path at the outer end of the dual-purpose water vapor port (46) is in pipe connection with the flushing medium valve (17), a connecting pipe between the circulating water pump (2) and the first pressure sensor (3) is also provided with a shunt pipe and connected with the flushing medium valve (17), and the control device can control the opening and closing states of the flushing medium valve (17); a drain port (48) is formed in the bottom of the filtering tank (40), the drain port (48) is in pipe connection with the drain port valve (21), a medium suction inlet (49) communicating with the filtration chamber (42) is also formed in the filtering tank (40), and the medium suction inlet (49) is externally connected with a medium replenishment device (22) through the medium suction valve (19) and a pipe; the vacuum powder suction machine (18) is in pipe connection with the air suction valve (20) and the exhaust port (47) in sequence through pipelines; the medium replacement mode comprises the following operation steps: step Si, self-cleaning the filtering tank; after the control device controls the drain port valve (21) to drain water, the control device controls the flushing medium valve (17) to open, so that the pool water is ejected from the spray pipe (421) to flush and shake off the perlite powder on the filter element hose, and the shaken perlite powder and sewage are drained from the drain port (48); step S2, adding a medium; the control device controls the flushing medium valve (17) and the drain port valve (21) to close, the control device controls the medium suction valve (19) and the air suction valve (20) to open, the control device controls the vacuum powder suction machine (18) to work to suck air into the filtering tank (40) to form a negative pressure environment in the filtering tank (40), and the perlite powder in the medium replenishment device (22) enters into the filtration chamber (42) from the medium suction inlet (49); step S3, water filling; the control device controls the medium suction valve (19) and the air suction valve (20) to close, and the control device controls the water inlet valve (11) and the exhaust port valve (12) to open and controls the circulating water pump (2) to work for water filling in the filtering tank (40); and step S4, switching the mode; the medium replacement mode is completed after the fills in the filtering tank (40), the regenerative filtration system automatically re-enters the closed loop pre-coat mode and the external circulation filtration mode in sequence, and fresh perlite powder is adhered to the filter element hose in the closed loop pre-coat mode.

5. The control method of a regenerative filtration system according to any one of claims 1 to 4, wherein the analysis of whether the water quality meets the water quality standard requirements is to perform at least one of the following judgments: judgment P1, whether the redox potential (ORP) is greater than or equal to 650 mV; judgment P2, whether the potential of hydrogen (pH value) is between 7.2 and 7.8; the dosing module (9) doses water quality treatment substances into the pool (10), and the water quality treatment substances comprise chlorine-containing disinfectants and pH regulators; when the ORP is less than 650 mV, the control device controls the dosing module (9) to dose the chlorine-containing disinfectants into the pool (10); and when the pH is greater than 7.8, the control device controls the dosing module (9) to dose the pH regulators into the pool (10).

6. A regenerative filtration system, comprising: a pre-filter (1), used for pre-treating and filtering pool water sucked into a circulating water pump (2) to filter the large debris in the pool water; a circulating water pump (2), used for conveying the pool water into a regenerative filter (4); a water pump speed-regulating frequency converter, connected with the circulating water pump (2) and used for controlling the rotational speed of the circulating water pump (2); a first pressure sensor (3), used for detecting the inlet water pressure of a filtration water inlet (41) of the regenerative filter (4); a regenerative filter (4), used for filtering and purifying the pool water; a second pressure sensor (5), used for detecting the outlet water pressure of an external circulation water outlet (44) of the regenerative filter (4); a closed loop pre-coat pipeline module (6), used for conveying the pool water from the closed loop pre-coat water outlet (45) of the regenerative filter (4) into the regenerative filter (4) again through the circulating water pump (2) forfiltration and purification again; an external circulation pipeline module (7), used for returning the filtered water to the pool 10 from the external circulation water outlet (44) of the regenerative filter (4) one end of the external circulation pipeline is in pipe connection with the external circulation water outlet (44) of the regenerative filter (4), and the other end of the external circulation pipeline is in pipe connection with the pool (10); a water quality monitoring module (8), used for detecting water quality in the pool (10) or water quality in the external circulation water outlet (44) of the regenerative filter (4); dosing module (9), used for dosing chemicals into the pool (10) to adjust the water quality; a control device, used for controlling the opening and closing states of the circulating water pump (2), the opening and closing states of the closed loop pre-coat pipeline module (6), the opening and closing states of the external circulation pipeline module (7) and the working state of the dosing module (9); the first pressure sensor (3), the second pressure sensor (5) and the water quality monitoring module (8) are electrically connected with the control device; a human-machine interaction interface, electrically connected with the control device and used for manually controlling and adjusting the operating parameters of the regenerative filtration system; after being started, the automatic filtration control system enters the closed loop pre-coat mode, the circulating water pump (2) and the closed loop pre-coat pipeline module (6) are opened to perform closed loop pre-coat purification on the pool water; after the closed loop pre-coat mode reaches preset time, the system enters the external circulation filtration mode, the closed loop pre-coat pipeline module (6) is closed and the external circulation pipeline module (7) is opened to send the filtered and purified pool water into the pool (10); the control device analyzes a detection signal of the water quality monitoring module (8) and then controls the dosing module (9) to dose the chemicals; the inlet water pressure detected by the first pressure sensor (3) is X, and the outlet water pressure detected by the second pressure sensor (5) is Y; and when X-Y| is greater than or equal to 50, the control device controls the circulating water pump (2) to stop and enter the regeneration mode.

7. The regenerative filtration system according to claim 6, also comprising a water inlet valve (11) and an exhaust port valve (12), wherein a water outlet of the circulating water pump (2) is connected with the first pressure sensor (3) and the water inlet valve (11) in sequence through pipelines and is then connected with the filtration water inlet (41) of the regenerative filter (4), and the control device can control the opening and closing states of the water inlet valve (11); the regenerative filter (4) comprises a filtering tank (40), a filtration chamber (42) and a water purification chamber (43) are formed in the filtering tank (40), the regenerative filter (4) also comprises a plurality of filter element hoses located in the filtration chamber (42) and a plurality of spray pipes (421) distributed between the filter element hoses, a water outlet of the filter element hose communicates with the water purification chamber (43), the external circulation water outlet (44) and the closed loop pre-coat water outlet (45) are formed in the filtering tank (40) and communicate with the water purification chamber (43), the filtration water inlet (41) is formed in the filtering tank (40) and communicates with thefiltration chamber (42), a dual-purpose water vapor port (46) communicating with the filtration chamber (42) and an exhaust port (47) which communicates with the water purification chamber (43) and is used for exhausting gas are also formed in the filtering tank (40), an inner end of the dual-purpose water vapor port (46) is connected with the spray pipe (421), an outer end of the dual-purpose water vapor port (46) is divided into two paths, an air injection port formed in one of the paths is used for outside air injection; the exhaust port (47) is in pipe connection with an exhaust port valve (12); and when the regenerative filtration system enters the regenerative mode, outside air is injected into the filtering tank (40) from the dual-purpose water vapor port (46), ejected from the spray pipe (421), and exhausted from the exhaust port (47).

8. The regenerative filtration system according to claim 7, also comprising a transparent water pipe (13), a closed loop pre-coat valve (14), a three-way joint (15) and an external circulation valve (16), wherein one end of the closed loop pre-coat pipeline module (6) is in pipe connection with the closed loop pre-coat water outlet (45) of the regenerative filter (4), the other end of the closed loop pre-coat pipeline module (6) is connected with one end of the transparent water pipe (13), the other end of the transparent water pipe (13) is connected with a first port of the three-way joint (15) through the closed loop pre-coat valve (14), a second port of the three way joint (15) is connected with a water outlet of the pre-filter (1), a third port of the three-way joint (15) is connected with a water inlet of the circulating water pump (2), and the control device can control the opening and closing states of the closed loop pre-coat valve (14); one end of the external circulation pipeline module (7) is in pipe connection with the second pressure sensor (5), the external circulation valve (16) and the external circulation water outlet (44) of the regenerative filter (4) in sequence; the control device can control the opening and closing states of the external circulation valve (16); when the regenerative filtration system enters the closed loop pre-coat mode, the closed loop pre-coat valve (14) is opened and the external circulation valve (16) is closed; and when the regenerative filtration system enters the external circulation mode, the closed loop pre-coat valve (14) is closed and the external circulation valve (16) is opened.

9. The regenerative filtration system according to claim 6, also comprising a flushing medium valve (17), a vacuum powder suction machine (18), a medium suction valve (19), an air suction valve (20) and a drain port valve (21), wherein another path at the outer end of the dual purpose water vapor port (46) is in pipe connection with the flushing medium valve (17), a connecting pipe between the circulating water pump (2) and the first pressure sensor (3) is also provided with a shunt pipe and connected with the flushing medium valve (17), and the control device can control the opening and closing states of the flushing medium valve (17); a drain port (48) is formed in the bottom of the filtering tank (40), the drain port (48) is in pipe connection with the drain port valve (21), a medium suction inlet (49) communicating with the filtration chamber (42) is also formed in the filtering tank (40), and the medium suction inlet (49) is externally connected with a medium replenishment device (22) through the medium suction valve (19) and a pipe; and the vacuum powder suction machine (18) is in pipe connection with the air suction valve (20) and the exhaust port (47) in sequence through pipelines.

10. The regenerative filtration system according to claim 6, also comprising at least one air compressor (23), wherein the water inlet valve (11), the flushing medium valve (17), the closed loop pre-coat valve (14), the external circulation valve (16), the exhaust port valve (12), the medium suction valve (19) and/or the drain port valve (21) are pneumatic valves, and the control device supplies or disconnect air for the water inlet valve (11), the flushing medium valve (17), the closed loop pre-coat valve (14), the external circulation valve (16), the exhaust port valve (12), the medium suction valve (19) and/or the drain port valve (21) through the air compressor (23) to realize the control for the switching state.