Filter cleaning system

Abstract

The utility model discloses a filter cleaning system, and relates to the technical field of chemical equipment cleaning. The device comprises at least one filtering tank filled with filtering materials, each filtering tank is respectively provided with a sub-control feed pipe and a sub-control discharge pipe, and the sub-control feed pipe and the sub-control discharge pipe are respectively provided with a sub-control feed valve and a sub-control discharge valve, and is characterized by comprising a circulating tank provided with a water injection pipe, a water outlet pipe and a water return pipe, a water injection valve is mounted on the water injection pipe, a first water outlet valve and a second water outlet valve are mounted on the water outlet pipe in series, the outlet end of the second water outlet valve is connected to one end of a sub-control water inlet pipe of each filtering tank, and the other end of each sub-control water inlet pipe is connected to a sub-control feeding pipe between the corresponding filtering tank and the sub-control feeding valve of the filtering tank; and each sub-control water inlet pipe is provided with a sub-control water inlet valve of each filter. The circulating tank is arranged, the blocked filtering tank can be cleaned through circulation of water and liquid caustic soda, manual contact is avoided, and potential safety hazards are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a filter cleaning system relates to chemical equipment cleaning technical field. BACKGROUND

[0002] At present, in the chemical enterprise, the filter tank is used very much filter, the filter tank passes through the filter structure in, can remove the impurity in water or material. When the outlet flow reduces in the process of using, the filter tank needs to be cleaned. Because the material of chemical enterprise exists high temperature, has the problem such as corrosive, in the replacement filter structure, is easy to cause damage to maintenance personnel, and need to do well protection strictly in the process of operating. When the air temperature is high in summer, the operator wears protective articles and is easy to appear the phenomenon of heatstroke, and wearing protective articles will cause the hindrance to maintenance personnel, reduced maintenance efficiency. When filtering material, the filter tank will gradually block the filter structure with the increase of the impurity retained, make the pipeline pressure of connecting filter tank increase, the increase of pressure, will lead to the valve of pipeline interface damage, cause the mixing phenomenon of material in different pipelines due to valve leakage, cause production accident. SUMMARY

[0003] The utility model discloses a kind of filter cleaning systems, which can clean filter and detect leakage of valve of material pipeline.

[0004] The utility model discloses a filter cleaning system, which comprises at least one filter tank containing filtered material. Each filter tank is provided with a separate control feed pipe and a separate control discharge pipe. The separate control feed pipe and the separate control discharge pipe are respectively provided with a separate control feed valve and a separate control discharge valve. The filter cleaning system is characterized in that it comprises a circulating tank provided with a water injection pipe, a water outlet pipe and a water return pipe. A water injection valve is arranged on the water injection pipe. A first water outlet valve and a second water outlet valve are connected in series on the water outlet pipe. The outlet end of the second water outlet valve is connected to one end of a separate control water inlet pipe of each filter tank. The other end of each separate control water inlet pipe is connected to a separate control feed pipe between the corresponding filter tank and its separate control feed valve. A separate control water inlet valve of each filter is arranged on each separate control water inlet pipe.

[0005] A circulating pump is arranged between the first water inlet valve and the second water inlet valve. A pressurizing pipe is connected between the circulating pump and each separate control water inlet valve. A compressed air valve is arranged on the pressurizing pipe.

[0006] The water return pipe of the circulating tank is connected to a separate control water return pipe of each filter tank through a water return valve. A separate control water return valve is arranged on each separate control water return pipe. The separate control water return valve is connected to the discharge port of the corresponding filter tank.

[0007] A sewage pipe is further connected to the end of the water outlet valve. A sewage valve is arranged on the sewage pipe. A dosing pipe is arranged on the circulating tank. A dosing valve is arranged on the dosing pipe. An always-open air vent is arranged on the upper part of the circulating tank.

[0008] Further, each filter tank has two series control feed valves, a feed leak detection pipe is connected between the two series control feed valves, and a feed leak detection valve is installed on the feed leak detection pipe.

[0009] Further, the blowdown valve comprises a first blowdown valve and a second blowdown valve, one end of the first blowdown valve is connected with the outlet of the first water outlet valve, the other end is connected with the water return pipe between the series control water return valve of each filter tank and the water return valve, and the second blowdown valve is connected with the blowdown pipe between the first blowdown valve and the water return valve and connected with the water return pipe at one end.

[0010] Further, an electric conductivity instrument is installed on the water return pipe between the first blowdown valve and the second blowdown valve.

[0011] Further, two series control water inlet valves are connected on the series control water inlet pipe of each filter tank, and a water inlet leak detection valve is connected through a branch pipe between the two series control water inlet valves; and / or two series control water return valves are arranged on the series control water return pipe connected with the discharge port of each filter tank, and a water return leak detection valve is connected through a branch pipe between the two series control water return valves.

[0012] Further, a pressure transmitter is arranged on the total feed pipe connected with the series control feed pipe of each filter tank, and a first flow meter is arranged on the total discharge pipe connected with the series control discharge pipe of each filter tank.

[0013] Further, a second flow meter is arranged on the water injection pipe of the circulating tank, a third flow meter is arranged on the dosing pipe, and a fourth flow meter is arranged on the water outlet pipe between the first water outlet valve and the second water outlet valve.

[0014] The utility model discloses a circulating tank can be washed through water and liquid alkali circulation to the filter tank of blockage, avoids manual contact, reduces the potential safety hazard. The utility model discloses a plurality of leak detection valves, and the pipeline of each leak detection valve is communicated with leak detection sensor, can detect the closed valve that contacts material, judges whether the closed valve has the phenomenon of leakage, avoids the mixing phenomenon of material in different pipelines due to leakage. The utility model discloses a plurality of filter tanks and circulating tank pipeline parallel connection design, so that the system can not interrupt the filtration process when washing the filter tank, improves work efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the structure schematic drawing of the utility model embodiment;

[0016] Figure 2 It is Figure 1 It is the structure schematic drawing of the filter tank part;

[0017] Wherein: 1, the first filter tank, 2, the second filter tank, 3, the first sub-control feed pipe, 4, the second sub-control feed pipe, 5, the total feed pipe, 6, the first sub-control feed valve, 7, the second sub-control feed valve, 8, the third sub-control feed valve, 9, the fourth sub-control feed valve, 10, the first sub-control discharge pipe, 11, the second sub-control discharge pipe, 12, the first sub-control discharge valve, 13, the second sub-control discharge valve, 14, the third sub-control discharge valve, 15, the fourth sub-control discharge valve, 16, the total discharge pipe, 17, the pressure transmitter, 18, the first flowmeter, 19, the first feed leak detection pipe, 20, the first feed leak detection valve, 21, the second feed leak detection pipe, 22, the second feed leak detection valve, 23, the first discharge leak detection pipe, 24, the first discharge leak detection valve, 25, the second discharge leak detection pipe, 26, the second discharge leak detection valve, 27, the circulating tank, 28, the water filling pipe, 29, the water filling valve, 30, the second flowmeter, 31, the chemical adding pipe, 32, the chemical adding valve, 33, the third flowmeter, 34, the air vent, 35, the liquid level meter, 36, the water discharge pipe, 37, the first water discharge valve, 38, the second water discharge valve, 39, the first sub-control water inlet pipe, 40, the first sub-control water inlet valve, 41, the second sub-control water inlet valve, 42, the first water inlet leak detection valve, 43, the second sub-control water inlet pipe, 44, the third sub-control water inlet valve, 45, the fourth sub-control water inlet valve, 46, the second water inlet leak detection valve, 47, the first sub-control water outlet pipe, 48, the first sub-control water outlet valve, 49, the second sub-control water outlet valve, 50, the first water outlet leak detection valve, 51, the second sub-control water outlet pipe, 52, the third sub-control water outlet valve, 53, the fourth sub-control water outlet valve, 54, the second water outlet leak detection valve, 55, the water outlet pipe, 56, the water outlet valve, 57, the circulating pump, 58, the pressurizing pipe, 59, the compressed air valve, 60, the conductivity meter, 61, the blowdown pipe, 62, the first blowdown valve, 63, the second blowdown valve, 64, the fourth flowmeter. DETAILED DESCRIPTION

[0018] In Figure 2 Define the upward and downward directions of the present embodiment.

[0019] The utility model discloses a filter tank, this embodiment is provided with first filter tank 1 and second filter tank 2, and is equipped with filter structure in two filter tanks, and first filter tank 1 upper portion is provided with first sub -control feed pipe 3, and first sub -control feed pipe 3 is communicated with the inner chamber of first filter tank 1, and second filter tank 2 upper portion is provided with second sub -control feed pipe 4, and second sub -control feed pipe 4 is communicated with the inner chamber of second filter tank 2.

[0020] In the embodiment, the first sub-control feed pipe 3 and the second sub-control feed pipe 4 are in communication with each other, and both of the sub-control feed pipes are in communication with the total feed pipe 5. During use, the total feed pipe 5 can be used to deliver materials to the two filter tanks. The first sub-control feed pipe 3 is provided with a first sub-control feed valve 6 and a second sub-control feed valve 7. The first and second sub-control feed valves are connected in series. A first feed leak detection pipe 19 is arranged between the two sub-control feed valves. The first feed leak detection pipe 19 is in communication with the first sub-control feed pipe 3 and is provided with a first feed leak detection valve 20. During use, the first feed leak detection valve 20 can be opened to detect whether the first sub-control feed valve 6 and the second sub-control feed valve 7 have a material leakage phenomenon.

[0021] The first filter tank 1 is provided with a first sub-control discharge pipe 10 at the lower part, which is communicated with the inner cavity of the first filter pipe 1; the second filter tank 2 is provided with a second sub-control discharge pipe 11 at the lower part, which is communicated with the inner cavity of the second filter tank 2. In this embodiment, the first sub-control discharge pipe 10 and the second sub-control discharge pipe 11 are communicated with each other, and both of them are communicated with a total discharge pipe 16; during use, the materials filtered by each filter tank can be conveyed to the total discharge pipe 16 through each sub-control discharge pipe and discharged. The first sub-control discharge pipe 10 is provided with a first sub-control discharge valve 12 and a second sub-control discharge valve 13 in series, and a first discharge leak detection pipe 23 is arranged between the two sub-control discharge valves, which is communicated with the first sub-control discharge pipe 10 and is provided with a first discharge leak detection valve 24; during use, the opening of the first discharge leak detection valve 24 can detect whether the first sub-control discharge valve 12 and the second sub-control discharge valve 13 exist the material leakage phenomenon. The second sub-control discharge pipe 11 is provided with a third sub-control discharge valve 14 and a fourth sub-control discharge valve 15 in series, and a second discharge leak detection pipe 25 is arranged between the two sub-control discharge valves, which is communicated with the second sub-control discharge pipe 11 and is provided with a second discharge leak detection valve 26; during use, the opening of the second discharge leak detection valve 26 can detect whether the third sub-control discharge valve 14 and the fourth sub-control discharge valve 15 exist the material leakage phenomenon.

[0022] In this embodiment, the total feed pipe 5 is provided with a pressure transmitter 17, which can detect the change of the pressure in the total feed pipe 5; the total discharge pipe 16 is provided with a first flow meter 18, which is used for detecting the change of the flow in the total discharge pipe 16, and can cooperate with the pressure transmitter 17 to judge whether the first and second filter tanks exist the blocking phenomenon. During use, when the pressure detected by the pressure transmitter 17 is higher than the set value, and the flow detected by the first flow meter 18 is lower than the set value, it indicates that the filter tank communicated with it exists the blocking phenomenon, which needs to be cleaned; when the flow detected by the first flow meter 18 is higher than the set value, it indicates that the filter structure in the filter tank communicated with it exists the damage, which needs to be replaced and repaired.

[0023] The utility model discloses a circulating tank 27 is provided with, and the circulating tank 27 top is provided with the water injection pipe 28 and the dosing pipe 31, and the water injection pipe 28 and the dosing pipe 31 all are connected with the inner chamber of circulating tank 27, wherein the water injection pipe 28 is used to deliver water to the circulating tank 27, and the water injection pipe 28 is provided with the water injection valve 29, is used to control the switch of water injection pipe 28, and the water injection valve 29 is provided with the second flowmeter 30 on the water injection pipe 28 between circulating tank 27, is used to detect the flow of water input circulating tank 27. In the embodiment, the dosing pipe 31 is used to deliver alkali to the circulating tank 27, and the dosing pipe 31 is provided with the dosing valve 32, is used to control the switch of dosing pipe 31, and the dosing valve 32 is provided with the third flowmeter 33 on the dosing pipe 31 between circulating tank 27, is used to detect the flow of alkali input circulating tank 27. The upper portion of circulating tank 27 is provided with the vent 34, and the vent 34 is always open, and when inputting and outputting liquid in the circulating tank 27, plays the role of exhaust. Circulating tank 27 is provided with the liquid level meter 35, is used to detect the liquid level change of liquid in circulating tank 27, and the component is prior art, and here does not make too much repetition.

[0024] The lower portion of circulating tank 27 is provided with the water outlet pipe 36, and the water outlet pipe 36 is communicated with the inner chamber of circulating tank 27, is used to output the liquid in circulating tank 27, and the water outlet pipe 36 is provided with the first water outlet valve 37 and the second water outlet valve 38 in series, and the first water outlet valve 37 and the second water outlet valve 38 are provided with the circulating pump 57, and in the use process, the circulating pump 57 can pump the liquid in circulating tank 27 into the water outlet pipe 36. The fourth flowmeter 64 is provided with on the water outlet pipe 36 between the circulating pump 57 and the second water outlet valve 38, and the fourth flowmeter 64 is used to detect the flow through the water outlet pipe 36.

[0025] The outlet end of second water outlet valve 38 is connected with the first sub-control water inlet pipe 39 and the one end of second sub-control water inlet pipe 43, the other end of first sub-control water inlet pipe 39 is communicated with first sub-control feed pipe 3, and the connecting place is located between first filter tank 1 and second sub-control feed valve 7, can deliver the liquid in water outlet pipe 36 into first filter tank 1, and first sub-control water inlet pipe 39 is provided with first sub-control water inlet valve 40 and second sub-control water inlet valve 41 in series, and the branch pipe of first sub-control water inlet pipe 39 is provided between two sub-control water inlet valves, and the branch pipe is installed with first water inlet leak detection valve 42, can detect whether first sub-control water inlet valve 40 and second sub-control water inlet valve 41 exist leak phenomenon after opening. The other end of second sub-control water inlet pipe 43 is communicated with second sub-control feed pipe 4, and the connecting place is located between second filter tank 2 and fourth sub-control feed valve 9, can deliver the liquid in water outlet pipe 36 into second filter tank 2, and second sub-control water inlet pipe 43 is provided with third sub-control water inlet valve 44 and fourth sub-control water inlet valve 45 in series, and the branch pipe of second sub-control water inlet pipe 43 is provided between two sub-control water inlet valves, and the branch pipe is installed with second water inlet leak detection valve 46, can detect whether third sub-control water inlet valve 44 and fourth sub-control water inlet valve 45 exist leak phenomenon after opening.

[0026] The first filter tank 1 is connected with a first sub-control backwater pipe 47 at the lower end of the discharge port. The first sub-control backwater pipe 47 is connected with a first sub-control backwater valve 48 and a second sub-control backwater valve 49 in series. A branch pipe of the first sub-control backwater pipe 47 is arranged between the two sub-control backwater valves. A first backwater leak detection valve 50 is arranged on the branch pipe. When the first backwater leak detection valve 50 is opened, the first sub-control backwater valve 48 and the second sub-control backwater valve 49 can be detected for leakage. The second filter 2 is connected with a second sub-control backwater pipe 51 at the lower end of the discharge port. The second sub-control backwater pipe 51 is connected with a third sub-control backwater valve 52 and a fourth sub-control backwater valve 53 in series. A branch pipe of the second sub-control backwater pipe 51 is arranged between the two sub-control backwater valves. A second backwater leak detection valve 54 is arranged on the branch pipe. When the second backwater leak detection valve 54 is opened, the third sub-control backwater valve 52 and the fourth sub-control backwater valve 53 can be detected for leakage.

[0027] In the embodiment, each branch pipe is a leak detection pipe as described above. An inductive joint of a detection sensor is arranged at the outlet end of each branch pipe, which will not be described in detail.

[0028] The first sub-control backwater pipe 47 and the second sub-control backwater pipe 51 are connected with a backwater pipe 55 at the other end. The backwater pipe 55 extends to the upper part of the circulating tank 27 and communicates with the inner cavity of the circulating tank 27, so as to facilitate the delivery of liquid into the circulating tank 27 to form a circulation. A backwater valve 56 is arranged on the backwater pipe 55 to control the opening and closing of the backwater pipe 55.

[0029] A first blowdown valve 62 is connected to the outlet of the first water outlet valve 37. The other end of the first blowdown valve 62 is connected to the backwater pipe 55 between each sub-control backwater valve and the backwater valve 56. A blowdown pipe 61 is connected to the backwater pipe 55 between the first blowdown valve 62 and the backwater valve 56. A second blowdown valve 63 is arranged on the blowdown pipe 61 to control the opening and closing of the blowdown pipe 61. An electric conductivity meter 60 is arranged on the backwater pipe 55 between the first blowdown valve 62 and the second blowdown valve 63 to detect the content of impurities in the liquid passing through.

[0030] A pressurizing pipe 58 is directly connected to each sub-control water inlet valve. The pressurizing pipe 58 communicates with the water outlet pipe 36 and is provided with a compressed air valve 59. When the compressed air valve 59 is opened, compressed air can be delivered into the water outlet pipe.

[0031] In the embodiment, each valve, detection component and circulating pump can be connected with a plc system to realize automatic control of each component.

[0032] The utility model discloses a valve initial state is closed, when carrying out filtering procedure, need open first sub -control feed valve 6 and second sub -control feed valve 7, make material delivery into first filter jar 1, open first sub -control discharge valve 12 and second sub -control discharge valve 13, make the material after filtering can enter total discharge pipe 16, need open second feed leak detection valve 21 simultaneously, detect whether third sub -control feed valve 8 exists material leakage state, and open second discharge leak detection valve 26, first water leak detection valve 42, first backwater leak detection valve 50 similarly, to detect whether the valve adjacent to the pipeline of conveying material exists material leakage phenomenon.

[0033] In the process of filtering material in first filter jar 1, when the pressure detected by pressure transmitter 17 is higher than the set value and the flow detected by first flowmeter 18 is lower than the set value, first filter jar 1 is blocked, need to switch filter jar, close first sub -control feed valve 6 and second sub -control feed valve 7 stop feeding in turn, close first water leak detection valve 42 and second feed leak detection valve 21, then open second water valve 38, first sub -control water inlet valve 40 and second sub -control water inlet valve 41, open first feed leak detection valve 20 to detect whether second sub -control feed valve 7 exists material leakage phenomenon, after completion, open compressed air valve 59, compressed air enters into first filter jar 1, and the material in first filter jar 1 is punched into total discharge pipe 16 by compressed air, reduces the loss of material. In the punching process, when first flowmeter 18 does not detect material passing in a certain time, close compressed air valve 59, second sub -control discharge valve 12, first sub -control discharge valve 13, first backwater leak detection valve 50 and second discharge leak detection valve 26 in turn, then open third sub -control feed valve 8 and fourth sub -control feed valve 9, make material delivery into second filter jar 2, open third sub -control discharge valve 14 and fourth sub -control discharge valve 15 to make the material after filtering can enter total discharge pipe 16, complete the switching of filter jar, open first discharge leak detection valve 24, second water leak detection valve 46, second backwater leak detection valve 54 simultaneously, to detect whether the valve adjacent to the pipeline of conveying material exists material leakage phenomenon.

[0034] After the filter tank switching is completed, the first filter tank 1 needs to be cleaned. First, open the water injection valve 28 to inject water into the circulating tank 27. The second flow meter 30 detects the amount of water injected during the water injection process. When the set water amount is reached, close the water injection valve 28. Then open the first water outlet valve 37, the first sub-control backwater valve 48, the second sub-control backwater valve 49 and the backwater valve 56 to form a loop between the circulating tank 27 and the first filter tank 1. Then open the circulating pump 57 to circulate the water in the circulating tank 27 to clean the first filter tank 1 and preliminarily dissolve the impurities. After a period of cleaning, open the second sewage valve 63, then close the backwater valve 56, and use the circulating pump 57 to transport the sewage in the pipeline to the sewage pipe 61 for discharge. The air vent 34 provided at the upper part of the circulating tank 27 can prevent the circulating tank 27 from being sealed and unable to discharge sewage.

[0035] When the fourth flow meter 64 does not detect liquid passing through the water outlet pipe 36 within a certain time, close the circulating pump 57, the first water outlet valve 37 and the second sewage valve 63, and then open the water injection valve 28 and the dosing valve 32 to inject water and alkali into the circulating tank 27 to form liquid alkali in the circulating tank 27. The second flow meter 30 and the third flow meter 33 detect the amount of injection. When the set amount is reached, close the water injection valve 28 and the dosing valve 32. Then open the first water outlet valve 37 and the backwater valve 56, and then open the circulating pump 27 to dissolve and clean the impurities in the first filter tank 1. After a period of cleaning, open the second sewage valve 63, then close the backwater valve 56, and use the circulating pump 57 to transport the sewage in the pipeline to the sewage pipe 61 for discharge.

[0036] When the fourth flow meter 64 does not detect liquid passing through the water outlet pipe 36 within a certain time, close the circulating pump 57, the first water outlet valve 37 and the second sewage valve 63, and then open the water injection valve 28 to inject water into the circulating tank 27. When the set water amount is reached, close the water injection valve 29. Then open the first water outlet valve 37 and the backwater valve 56, and then open the circulating pump 27 to clean the residual alkali in the first filter tank 1 and the pipeline. After a period of cleaning, open the second sewage valve 63, then close the backwater valve 56, and use the circulating pump 57 to transport the sewage in the pipeline to the sewage pipe 61 for discharge. During the drainage process, open the conductivity meter 60 to detect whether the discharged water contains alkali. When the detected conductivity is higher than the set value, it indicates that the water contains alkali. After the sewage is discharged, the above steps need to be repeated for water injection and cleaning again until the value detected by the conductivity meter 60 meets the set value.

[0037] After the cleaning of residual alkali is completed and the sewage discharge is detected by the fourth flow meter 64, the circulating pump 57, the second water outlet valve 38, the first sub-control water inlet valve 40, the second sub-control water inlet valve 41, the first sub-control water return valve 48, and the second sub-control water return valve 49 are closed, and then the first sewage valve 62 is opened, so that the residual water in the circulating tank 27 is further discharged, residual water in the circulating tank 27 is avoided, and whether there is residual water is detected by the liquid level meter 35 during the discharging process; after the circulating tank 27 is emptied and detected by the liquid level meter 35, the first water outlet valve 37 and the first sewage valve 62 are closed, and the cleaning of the clogged filter tank is completed.

Claims

1. A filter cleaning system comprising at least one filter tank filled with filter material, each filter tank being provided with a separate feed pipe and a separate discharge pipe, said separate feed pipe and separate discharge pipe being provided with a separate feed valve and a separate discharge valve, respectively, characterized in that: It includes a circulating tank with a water injection pipe, a water outlet pipe and a backwater pipe, the water injection pipe is provided with a water injection valve, the water outlet pipe is provided with a first water outlet valve and a second water outlet valve in series, the outlet end of the second water outlet valve is connected to one end of a control water inlet pipe of each filter tank, the other end of each control water inlet pipe is connected to a control feed pipe between the corresponding filter tank and its control feed valve, and each control water inlet pipe is provided with a control water inlet valve of each filter; A circulating pump is installed between the first water inlet valve and the second water inlet valve, and a pressurizing pipe is externally connected between the circulating pump and each control water inlet valve, and a compressed air valve is arranged on the pressurizing pipe; The backwater pipe of the circulating tank is connected to a control backwater pipe of the discharge port of each filter tank through a backwater valve, a control backwater valve is arranged on each control backwater pipe, and the control backwater valve is connected to the discharge port of the corresponding filter tank; The end of the water outlet valve is also connected to a blowdown pipe, and a blowdown valve is arranged on the blowdown pipe; a dosing pipe is arranged on the circulating tank, and a dosing valve is arranged on the dosing pipe; and an always-open air vent is arranged on the upper part of the circulating tank.

2. A filter cleaning system characterized by: Each filter tank is respectively provided with two control feed valves in series, a feed leak detection pipe is connected to the control feed pipe between the two control feed valves, and a feed leak detection valve is arranged on the feed leak detection pipe; and / or, each filter tank is respectively provided with two control discharge valves in series, a discharge leak detection pipe is connected to the control discharge pipe between the two control discharge valves, and a discharge leak detection valve is arranged on the discharge leak detection pipe.

3. A filter cleaning system according to claim 1 or 2, characterised in that: The blowdown valve includes a first blowdown valve and a second blowdown valve, one end of the first blowdown valve is connected to the outlet of the first water outlet valve, the other end is connected to the backwater pipe between the control backwater valve of each filter tank and the backwater valve, and the second blowdown valve is connected to the blowdown pipe between the first blowdown valve and the backwater valve and connected to the backwater pipe at one end.

4. The filter cleaning system of claim 1 or 2 or 3, wherein: An electric conductivity instrument is arranged on the backwater pipe between the first blowdown valve and the second blowdown valve.

5. The filter cleaning system of claim 1 or 2 or 3, wherein: Two control water inlet valves in series are arranged on the control water inlet pipe of each filter tank, and a water inlet leak detection valve is connected through a branch pipe between the two control water inlet valves; and / or, two control backwater valves in series are arranged on the control backwater pipe connected to the discharge port of each filter tank, and a backwater leak detection valve is connected through a branch pipe between the two control backwater valves.

6. The filter cleaning system of claim 1 or 2 or 3, wherein: A pressure transmitter is arranged on the total feed pipe connected to the control feed pipe of each filter tank, and a first flow meter is arranged on the total discharge pipe connected to the control discharge pipe of each filter tank.

7. The filter cleaning system of claim 1 or 2 or 3, wherein: A second flow meter is arranged on the water injection pipe of the circulating tank, a third flow meter is arranged on the dosing pipe, and a fourth flow meter is arranged on the water outlet pipe between the first water outlet valve and the second water outlet valve.

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