Filter system with self-cleaning function and water purifier

Abstract

The utility model relates to a filtering system with a self-cleaning function and a water purifier. Relates to the technical field of water purification equipment. The device specifically comprises a multi-stage filter element used for filtering water, a water storage tank used for storing the water filtered by the multi-stage filter element, a water supply pipeline used for supplying water to the multi-stage filter element, a cleaning pipeline used for backwashing the multi-stage filter element, and a blow-off pipeline used for discharging cleaned wastewater; the water supply pipeline is communicated with the multi-stage filter element, and the water storage tank is communicated with the multi-stage filter element through the cleaning pipeline. According to the utility model, the cleaning pipeline and the blow-off pipeline are arranged, the water storage tank is communicated with the multi-stage filter element through the cleaning pipeline, purified water in the water storage tank is conveyed to the multi-stage filter element through the cleaning pipeline, the multi-stage filter element is subjected to backwashing, and then waste water generated after backwashing is discharged through the blow-off pipeline, so that self-cleaning of the multi-stage filter element can be realized; further, the service life of the multi-stage filter element is prolonged, and the use cost of the water purifier is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of water purification equipment, in particular to a filtering system with a self-cleaning function and a water purifier. Background Art

[0002] The tap water for daily drinking has undergone various cleaning, disinfection and sterilization means, and the water quality after leaving the factory can meet the national health standards. After passing through long pipelines and secondary pressurized water tanks, it flows into thousands of households. The pipelines and secondary pressurized water tanks are rarely cleaned and disinfected, and various reasons such as rust can cause secondary pollution of the water quality. After further detection, pathogenic impurities such as rust, lead, and phenol appear in varying degrees. Long-term drinking of this water may cause diseases such as kidney stones, cardiovascular diseases, and arteriosclerosis. Boiling the water can only kill the microorganisms in the water and cannot remove the impurities in the water that can cause chronic diseases.

[0003] The water purifier can filter out impurities and microorganisms in the water through a multi-stage filtration method. The existing water purifiers can be divided into coarse filtration water purifiers, ultrafiltration water purifiers and reverse osmosis water purifiers according to the filtration accuracy. Among them, the filter element for filtration generally selects a hollow fiber membrane module. After the filter element is used for a period of time, the impurities in the water adhere to one side surface of the membrane filaments, blocking the filtration holes on the membrane filaments and affecting the water throughput of the membrane module. At this time, the filter element needs to be replaced to enable the water purifier to continue to be used, resulting in a high use cost of the water purifier and unable to meet the current production requirements. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a filtering system with a self-cleaning function and a water purifier for the deficiencies of the above-mentioned existing technologies, which can realize the self-cleaning of the filtering system in the water purifier, thereby prolonging the service life of the filter element in the filtering system and reducing the use cost of the water purifier.

[0005] The utility model provides a filtering system with a self-cleaning function, including a multi-stage filter element for filtering water, a water storage tank for storing the water filtered by the multi-stage filter element, a water supply pipeline for supplying water to the multi-stage filter element, a cleaning pipeline for backwashing the multi-stage filter element, and a sewage pipeline for discharging the cleaned wastewater; the water supply pipeline is communicated with the multi-stage filter element, and the cleaning pipeline communicates the water storage tank with the multi-stage filter element.

[0006] Furthermore, the filtering system further includes a connecting pipeline for sequentially communicating the multi-stage filter elements, a filtering pipeline for conveying the water filtered by the multi-stage filter elements to the water storage tank, and a water output pipeline for outputting the water in the water storage tank for user use.

[0007] Further, the multi-stage filter element includes a primary filter element, a secondary filter element, a tertiary filter element, and a quaternary filter element. The primary filter element is used for rough filtering of water. The secondary filter element and the tertiary filter element are used for ultrafiltration of water. The quaternary filter element is used for reverse osmosis filtration of water. The water supply pipeline is connected to the primary filter element, and the filtration pipeline connects the quaternary filter element to the water storage tank.

[0008] Further, the primary filter element includes a first filter cartridge and a first filter screen disposed in the first filter cartridge. The secondary filter element and the tertiary filter element include a second filter cartridge, a second filter screen disposed in the second filter cartridge, and a filter membrane disposed outside the second filter screen. The quaternary filter element includes a third filter cartridge, a third filter screen disposed in the third filter cartridge, and a reverse osmosis membrane disposed outside the third filter screen.

[0009] Further, the cleaning pipeline includes a main pipe connected to the water storage tank, a first sub-pipe with one end connected to the main pipe and the other end connected to the secondary filter element, and a second sub-pipe with one end connected to the main pipe and the other end connected to the quaternary filter element. A driving device for driving the water flow is provided on the main pipe.

[0010] Further, the connecting pipeline includes a first connecting pipe connecting the primary filter element and the secondary filter element, a second connecting pipe connecting the secondary filter element and the tertiary filter element, and a third connecting pipe connecting the tertiary filter element and the quaternary filter element. The sewage discharge pipeline includes a first sewage discharge pipe provided on the water supply pipeline and a second sewage discharge pipe provided on the second connecting pipe.

[0011] Further, the cleaning pipeline includes a main pipe connected to the water storage tank, a first sub-pipe with one end connected to the main pipe and the other end connected to the primary filter element, a second sub-pipe with one end connected to the main pipe and the other end connected to the secondary filter element, a third sub-pipe with one end connected to the main pipe and the other end connected to the tertiary filter element, and a fourth sub-pipe with one end connected to the main pipe and the other end connected to the quaternary filter element.

[0012] Further, the connecting pipeline includes a first connecting pipe connecting the primary filter element and the secondary filter element, a second connecting pipe connecting the secondary filter element and the tertiary filter element, and a third connecting pipe connecting the tertiary filter element and the quaternary filter element. The sewage discharge pipeline includes a first sewage discharge pipe provided on the water supply pipeline, a second sewage discharge pipe provided on the first connecting pipe, a third sewage discharge pipe provided on the second connecting pipe, and a fourth sewage discharge pipe provided on the third connecting pipe.

[0013] Further, solenoid valves for controlling the opening or closing of the pipelines are provided on the water supply pipeline, the cleaning pipeline, the sewage discharge pipeline, and the water delivery pipeline. Water hammer elimination devices are provided on the solenoid valves. The water hammer elimination devices are used to eliminate the water hammer effect on the pipeline when the solenoid valves are closed.

[0014] The present utility model also provides a water purifier, which includes the above-mentioned filtration system with a self-cleaning function.

[0015] The filtration system with a self-cleaning function and the water purifier of the present utility model have the following beneficial effects:

[0016] (1) The filtration system further includes a cleaning pipeline and a sewage discharge pipeline. The cleaning pipeline connects the water storage tank with the multi-stage filter element. The purified water in the water storage tank is conveyed to the multi-stage filter element through the cleaning pipeline to perform backwashing on the multi-stage filter element, and then the wastewater generated after backwashing is discharged through the sewage discharge pipeline, so as to realize the self-cleaning of the multi-stage filter element, thereby prolonging the service life of the multi-stage filter element and reducing the use cost of the water purifier;

[0017] (2) The multi-stage filter element of the filtration system includes a primary filter element, a secondary filter element, a tertiary filter element, and a quaternary filter element. The primary filter element is used for rough filtration of water, the secondary filter element and the tertiary filter element are used for ultrafiltration of water, and the quaternary filter element is used for reverse osmosis filtration of water, so as to improve the water purification effect of the water purifier and ensure the physical health of users;

[0018] (3) The cleaning pipeline of the filtration system includes a main pipe, a first sub-pipe, and a second sub-pipe. The main pipe is connected to the water storage tank. One end of the first sub-pipe is connected to the main pipe and the other end is connected to the secondary filter element. One end of the second sub-pipe is connected to the main pipe and the other end is connected to the quaternary filter element. Thus, the primary filter element and the secondary filter element are backwashed by the purified water flowing through the main pipe and the first sub-pipe, and the tertiary filter element and the quaternary filter element are backwashed by the purified water flowing through the main pipe and the second sub-pipe, so as to realize the self-cleaning of the multi-stage filter element;

[0019] (4) The sewage discharge pipeline of the filtration system includes a first sewage discharge pipe and a second sewage discharge pipe. The wastewater generated after backwashing the secondary filter element and the primary filter element is discharged through the first sewage discharge pipe, and the wastewater generated after backwashing the quaternary filter element and the tertiary filter element is discharged through the second sewage discharge pipe, so as to realize the self-cleaning of the multi-stage filter element, thereby prolonging the service life of the multi-stage filter element and reducing the use cost of the water purifier;

[0020] (5) The cleaning pipeline of the filtration system includes a main pipe, a first sub-pipe, a second sub-pipe, a third sub-pipe, and a fourth sub-pipe. The sewage discharge pipeline includes a first sewage discharge pipe, a second sewage discharge pipe, a third sewage discharge pipe, and a fourth sewage discharge pipe, so that the filtration system can clean the primary filter element, the secondary filter element, the tertiary filter element, and the quaternary filter element respectively, and thus the cleaning of the multi-stage filter element is more accurate and efficient;

[0021] (6) A water hammer elimination device is provided on each solenoid valve of this filtration system. The huge instantaneous water pressure generated by the water flow in the pipeline due to the water hammer effect is eliminated through the water hammer elimination device, thereby protecting the pipeline and the solenoid valve, reducing the damage caused to the pipeline and the solenoid valve by the water hammer effect, further prolonging the service life of the filtration system, and reducing the use cost of the water purifier. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings incorporated into the specification and constituting a part of the specification illustrate embodiments of the present invention and, together with the description, are used to explain the principles of the present invention. In these drawings, like reference numerals are used to represent like elements.

[0023] Figure 1 Schematic diagram of the structure of a filtration system with self-cleaning function and a water purifier according to an embodiment of the present invention;

[0024] Figure 2 Schematic diagram of the structure of the primary filter element of a filtration system with self-cleaning function and a water purifier according to an embodiment of the present invention;

[0025] Figure 3 Schematic diagram of the structure of the secondary filter element and the tertiary filter element of a filtration system with self-cleaning function and a water purifier according to an embodiment of the present invention;

[0026] Figure 4 Schematic diagram of the structure of the quaternary filter element of a filtration system with self-cleaning function and a water purifier according to an embodiment of the present invention;

[0027] Figure 5 Schematic diagram of the structure of Embodiment 1 of a filtration system with self-cleaning function and a water purifier according to an embodiment of the present invention;

[0028] Figure 6 Schematic diagram of the structure of Embodiment 2 of a filtration system with self-cleaning function and a water purifier according to an embodiment of the present invention.

[0029] In the figure: 1. Multi-stage filter element; 11. Primary filter element; 111. First filter cartridge; 112. First filter screen; 12. Secondary filter element; 121. Second filter cartridge; 122. Second filter screen; 123. Filter membrane; 13. Tertiary filter element; 14. Quaternary filter element; 141. Third filter cartridge; 142. Third filter screen; 143. Reverse osmosis membrane; 2. Water storage tank; 3. Water supply pipeline; 4. Cleaning pipeline; 41. Main pipe; 411. Driving device; 42. First auxiliary pipe; 43. Second auxiliary pipe; 44. Third auxiliary pipe; 45. Fourth auxiliary pipe; 5. Sewage pipeline; 51. First sewage pipe; 52. Second sewage pipe; 53. Third sewage pipe; 54. Fourth sewage pipe; 6. Connecting pipeline; 61. First connecting pipe; 62. Second connecting pipe; 63. Third connecting pipe; 7. Filtering pipeline; 8. Water delivery pipeline; 9. Solenoid valve. Detailed implementation manners

[0030] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0031] Please refer to Figures 1 to 4 , a filtering system with a self-cleaning function according to an embodiment of the present utility model, includes a multi-stage filter element 1 for filtering water, a water storage tank 2 for storing the water filtered by the multi-stage filter element 1, a water supply pipeline 3 for supplying water to the multi-stage filter element 1, a cleaning pipeline 4 for backwashing the multi-stage filter element 1, and a sewage pipeline 5 for discharging the cleaned wastewater; the water supply pipeline 3 is communicated with the multi-stage filter element 1, and the cleaning pipeline 4 communicates the water storage tank 2 with the multi-stage filter element 1.

[0032] In this application, the filtering system includes a multi-stage filter element 1, a water storage tank 2 and a water supply pipeline 3. The water supply pipeline 3 is communicated with the multi-stage filter element 1 and supplies water to the multi-stage filter element 1 by means of pressurization. After the multi-stage filter element 1 filters the water in sequence, the water is conveyed to the water storage tank 2, and the filtered water is stored by the water storage tank 2 for users to use, so as to realize the function of the water purifier to provide purified water.

[0033] After the existing water purifier is used for a period of time, since the filtered sundries will block the filter element, it is necessary to replace the filter element to ensure the normal use of the water purifier. The replacement cost of the multi-stage filter element 1 is relatively high, resulting in a relatively high use cost of the water purifier, which cannot meet the current production and user requirements.

[0034] Therefore, in the present application, the filtration system further includes a cleaning pipeline 4 and a sewage pipeline 5. The cleaning pipeline 4 connects the water storage tank 2 with the multi-stage filter element 1. The purified water in the water storage tank 2 is conveyed to the multi-stage filter element 1 through the cleaning pipeline 4 to perform backwashing on the multi-stage filter element 1, and then the wastewater generated after backwashing is discharged through the sewage pipeline 5, so that self-cleaning of the multi-stage filter element 1 can be achieved, thereby extending the service life of the multi-stage filter element 1 and reducing the use cost of the water purifier.

[0035] In this embodiment, the filtration system further includes a connecting pipeline 6 for connecting the multi-stage filter element 1 in sequence, a filtration pipeline 7 for conveying the water filtered by the multi-stage filter element 1 to the water storage tank 2, and a water delivery pipeline 8 for delivering the water in the water storage tank 2 for user use. In the present application, the filtration system further includes a connecting pipeline 6, a filtration pipeline 7 and a water delivery pipeline 8. The connecting pipeline 6 connects the multi-stage filter element 1 in sequence, and the filtration pipeline 7 connects the multi-stage filter element 1 with the water storage tank 2.

[0036] After the water supply pipeline 3 conveys water to the multi-stage filter element 1, the water is circulated sequentially between the multi-stage filter elements 1 through the connecting pipeline 6, so that the multi-stage filter element 1 filters the water sequentially; then the water filtered by the multi-stage filter element 1 is conveyed to the water storage tank 2 through the filtration pipeline 7 for storage; finally, the purified water in the water storage tank 2 is output through the water delivery pipeline 8 for user use, thereby realizing the function of the water purifier to provide purified water.

[0037] Specifically, in this embodiment, the multi-stage filter element 1 includes a primary filter element 11, a secondary filter element 12, a tertiary filter element 13 and a quaternary filter element 14. The connecting pipeline 6 includes a first connecting pipe 61 connecting the primary filter element 11 and the secondary filter element 12, a second connecting pipe 62 connecting the secondary filter element 12 and the tertiary filter element 13, and a third connecting pipe 63 connecting the tertiary filter element 13 and the quaternary filter element 14. The water supply pipeline 3 is connected to the primary filter element 11, and the filtration pipeline 7 connects the quaternary filter element 14 with the water storage tank 2.

[0038] When the water supply pipeline 3 conveys water to the primary filter element 11, the water is roughly filtered by the primary filter element 11 to remove various visible substances in the tap water, such as dust and impurities, etc.; the water filtered by the primary filter element 11 is conveyed to the secondary filter element 12 through the first connecting pipe 61. After the secondary filter element 12 filters the water, the water is conveyed to the tertiary filter element 13 through the second connecting pipe 62, so that the water is ultra-filtered by the secondary filter element 12 and the tertiary filter element 13 to remove chlorine and organic impurities in the water and absorb the peculiar smell, color and odor generated by organic compounds in the water.

[0039] The water filtered by the three - stage filter element 13 is transported to the four - stage filter element 14 through the third connecting pipe 63, enabling the four - stage filter element 14 to perform reverse osmosis filtration on the water, thereby further removing trace bacteria, viruses, and heavy metals in the water and adjusting the pH value of the water; the water filtered by the four - stage filter element 14 is transported to the water storage tank 2 through the filter pipeline 7, and finally the purified water in the water storage tank 2 is output through the water delivery pipeline 8 for users to use, thereby improving the purification effect of the water purifier on water and ensuring the physical health of users.

[0040] In this embodiment, the primary filter element 11 includes a first filter cartridge 111 and a first filter screen 112 disposed in the first filter cartridge 111. When the water supply pipeline 3 transports tap water to the first filter cartridge 111 of the primary filter element 11, the first filter screen 112 disposed in the first filter cartridge 111 is used to filter the tap water, thereby realizing the micro - filtration of tap water and removing various visible substances in the tap water, such as dust and impurities.

[0041] The secondary filter element 12 and the tertiary filter element 13 include a second filter cartridge 121, a second filter screen 122 disposed in the second filter cartridge 121, and a filter membrane 123 disposed outside the second filter screen 122. When the water filtered by the primary filter element 11 is transported to the second filter cartridge 121 of the secondary filter element 12, the second filter screen 122 and the filter membrane 123 of the secondary filter element 12 are used to filter the water flowing through the second filter cartridge 121 of the secondary filter element 12 in sequence.

[0042] The water filtered by the secondary filter element 12 is transported to the second filter cartridge 121 of the tertiary filter element 13, and the second filter screen 122 and the filter membrane 123 in the tertiary filter element 13 are used to filter the water flowing through the second filter cartridge 121 of the tertiary filter element 13 in sequence, thereby realizing the ultra - filtration of water, removing chlorine and organic impurities in the water, and absorbing the odors, colors, and smells generated by organic compounds in the water.

[0043] The four - stage filter element 14 includes a third filter cartridge 141, a third filter screen 142 disposed in the third filter cartridge 141, and a reverse osmosis membrane 143 disposed outside the third filter screen 142. The water filtered by the tertiary filter element 13 is transported to the third filter cartridge 141 of the four - stage filter element 14, and the third filter screen 142 and the reverse osmosis membrane 143 are used to filter the water flowing through the third filter cartridge 141 in sequence, further removing trace bacteria, viruses, and heavy metals in the water and adjusting the pH value of the water, thereby improving the purification effect of the water purifier on water and ensuring the physical health of users.

[0044] Specifically, in the present application, the first filter screen 112, the second filter screen 122, and the third filter screen 142 can all be made of titanium alloy material. Since titanium alloy has good antibacterial effects and biocompatibility, compared with traditional PP and fiber filter materials, the first filter screen 112, the second filter screen 122, and the third filter screen 142 made of titanium alloy material can better improve water quality when filtering water, thereby enhancing the filtering effect of this multi-stage filtering structure.

[0045] Furthermore, in the present application, the filter membranes 123 of the secondary filter element 12 and the tertiary filter element 13 can be made of graphene material. Due to the stable weather resistance, biocompatibility, safety, and antibacterial and mildew-proof properties of graphene, the filter membranes 123 made of graphene material can not only enhance the filtering effect of the secondary filter element 12 and the tertiary filter element 13, thereby enhancing the filtering effect of the water purifier, but also extend the service life of the secondary filter element 12 and the tertiary filter element 13, thereby extending the service life of the water purifier, and can also ensure the water quality stability of the water purifier when it is not used for a long time.

[0046] Example 1, refer to Figure 5 :

[0047] In the present application, the cleaning pipeline 4 includes a main pipe 41, a first sub-pipe 42, and a second sub-pipe 43. The main pipe 41 is connected to the water storage tank 2. One end of the first sub-pipe 42 is connected to the main pipe 41, and the other end is connected to the secondary filter element 12. One end of the second sub-pipe 43 is connected to the main pipe 41, and the other end is connected to the quaternary filter element 14. A driving device 411 is provided on the main pipe 41. Specifically, in implementation, the driving device 411 can be a gear pump provided on the main pipe 41.

[0048] Solenoid valves 9 are provided on the main pipe 41, the first sub-pipe 42, and the second sub-pipe 43. When the solenoid valves 9 on the main pipe 41 and the first sub-pipe 42 are opened and the solenoid valve 9 on the second sub-pipe 43 is closed, the purified water in the water storage tank 2 is driven by the driving device 411 to flow through the main pipe 41 and the first sub-pipe 42 in sequence, so that the purified water enters the secondary filter element 12, and thus when the purified water flows through the secondary filter element 12 and the primary filter element 11 in sequence, the secondary filter element 12 and the primary filter element 11 are backwashed.

[0049] Furthermore, a first sewage pipe 51 is provided on the water supply pipeline 3. When the purified water flows through the secondary filter element 12 and the primary filter element 11 in sequence and backwashes the secondary filter element 12 and the primary filter element 11, the generated wastewater is discharged from the first sewage pipe 51, thereby realizing the self-cleaning of the primary filter element 11 and the secondary filter element 12, further extending the service life of the primary filter element 11 and the secondary filter element 12, and reducing the use cost of the water purifier.

[0050] When the solenoid valve 9 on the main pipe 41 and the second deputy pipe 43 is opened and the solenoid valve 9 on the first deputy pipe 42 is closed, the purified water in the water storage tank 2 is driven by the driving device 411 to flow through the main pipe 41 and the second deputy pipe 43 in sequence, so that the purified water enters the four-stage filter element 14. Thus, when the purified water flows through the four-stage filter element 14 and the three-stage filter element 13 in sequence, the four-stage filter element 14 and the three-stage filter element 13 are backwashed.

[0051] Furthermore, a second sewage pipe 52 is provided on the second connecting pipe 62 between the two-stage filter element 12 and the three-stage filter element 13. When the purified water flows through the four-stage filter element 14 and the three-stage filter element 13 in sequence and backwashes the four-stage filter element 14 and the three-stage filter element 13, the generated waste water is discharged from the second sewage pipe 52, thereby realizing the self-cleaning of the three-stage filter element 13 and the four-stage filter element 14, further prolonging the service life of the three-stage filter element 13 and the four-stage filter element 14, and reducing the use cost of the water purifier.

[0052] Example 2, refer to Figure 6 :

[0053] In this application, the cleaning pipeline 4 includes a main pipe 41, a first deputy pipe 42, a second deputy pipe 43, a third deputy pipe 44 and a fourth deputy pipe 45. The main pipe 41 is communicated with the water storage tank 2. One end of the first deputy pipe 42 is communicated with the main pipe 41 and the other end is communicated with the first-stage filter element 11. One end of the second deputy pipe 43 is communicated with the main pipe 41 and the other end is communicated with the two-stage filter element 12. One end of the third deputy pipe 44 is communicated with the main pipe 41 and the other end is communicated with the three-stage filter element 13. One end of the fourth deputy pipe 45 is communicated with the main pipe 41 and the other end is communicated with the four-stage filter element 14. A driving device 411 is provided on the main pipe 41. Specifically, in implementation, the driving device 411 can be a gear pump provided on the main pipe 41.

[0054] Solenoid valves 9 are provided on the main pipe 41, the first deputy pipe 42, the second deputy pipe 43, the third deputy pipe 44 and the fourth deputy pipe 45. When the solenoid valves 9 on the main pipe 41 and the first deputy pipe 42 are opened and the solenoid valves 9 on the second deputy pipe 43, the third deputy pipe 44 and the fourth deputy pipe 45 are closed, the purified water in the water storage tank 2 is driven by the driving device 411 to flow through the main pipe 41 and the first deputy pipe 42 in sequence, so that the purified water enters the first-stage filter element 11. Thus, when the purified water flows through the first-stage filter element 11, the first-stage filter element 11 is backwashed.

[0055] Furthermore, a first sewage pipe 51 is provided on the water supply pipeline 3. When the purified water flows through the first-stage filter element 11 and backwashes the first-stage filter element 11, the generated waste water is discharged from the first sewage pipe 51, thereby realizing the self-cleaning of the first-stage filter element 11, further prolonging the service life of the first-stage filter element 11, and reducing the use cost of the water purifier.

[0056] When the solenoid valve 9 on the main pipe 41 and the second auxiliary pipe 43 is opened and the solenoid valves 9 on the first auxiliary pipe 42, the third auxiliary pipe 44 and the fourth auxiliary pipe 45 are closed, the purified water in the water storage tank 2 is driven by the driving device 411 to flow through the main pipe 41 and the second auxiliary pipe 43 in sequence, so that the purified water enters the secondary filter element 12, and when the purified water flows through the secondary filter element 12, the secondary filter element 12 is backwashed.

[0057] Furthermore, a second sewage discharge pipe 52 is provided on the first connecting pipe 61 between the primary filter element 11 and the secondary filter element 12. When the purified water flows through the secondary filter element 12 and backwashes the secondary filter element 12, the generated waste water is discharged from the second sewage discharge pipe 52, thereby realizing the self-cleaning of the secondary filter element 12, further prolonging the service life of the secondary filter element 12, and reducing the use cost of the water purifier.

[0058] When the solenoid valve 9 on the main pipe 41 and the third auxiliary pipe 44 is opened and the solenoid valves 9 on the first auxiliary pipe 42, the second auxiliary pipe 43 and the fourth auxiliary pipe 45 are closed, the purified water in the water storage tank 2 is driven by the driving device 411 to flow through the main pipe 41 and the third auxiliary pipe 44 in sequence, so that the purified water enters the tertiary filter element 13, and when the purified water flows through the tertiary filter element 13, the tertiary filter element 13 is backwashed.

[0059] Furthermore, a third sewage discharge pipe 53 is provided on the second connecting pipe 62 between the secondary filter element 12 and the tertiary filter element 13. When the purified water flows through the tertiary filter element 13 and backwashes the tertiary filter element 13, the generated waste water is discharged from the third sewage discharge pipe 53, thereby realizing the self-cleaning of the tertiary filter element 13, further prolonging the service life of the tertiary filter element 13, and reducing the use cost of the water purifier.

[0060] When the solenoid valve 9 on the main pipe 41 and the fourth auxiliary pipe 45 is opened and the solenoid valves 9 on the first auxiliary pipe 42, the second auxiliary pipe 43 and the third auxiliary pipe 44 are closed, the purified water in the water storage tank 2 is driven by the driving device 411 to flow through the main pipe 41 and the fourth auxiliary pipe 45 in sequence, so that the purified water enters the quaternary filter element 14, and when the purified water flows through the quaternary filter element 14, the quaternary filter element 14 is backwashed.

[0061] Furthermore, a fourth sewage discharge pipe 54 is provided on the third connecting pipe 63 between the tertiary filter element 13 and the quaternary filter element 14. When the purified water flows through the quaternary filter element 14 and backwashes the quaternary filter element 14, the generated waste water is discharged from the fourth sewage discharge pipe 54, thereby realizing the self-cleaning of the quaternary filter element 14, further prolonging the service life of the quaternary filter element 14, and reducing the use cost of the water purifier.

[0062] Compared with the first embodiment, in which only the primary filter element 11 and the secondary filter element 12 can be cleaned simultaneously, or the tertiary filter element 13 and the quaternary filter element 14 can be cleaned simultaneously, in the second embodiment, the primary filter element 11, the secondary filter element 12, the tertiary filter element 13 and the quaternary filter element 14 can be cleaned separately. Therefore, the cleaning method in the second embodiment is more accurate and efficient; while the pipeline structure of the first embodiment is simpler than that of the second embodiment and is easier to implement. These two implementation methods can be determined according to the specific production situation.

[0063] In this embodiment, solenoid valves 9 are also provided on the water supply pipeline 3, the sewage discharge pipeline 5 and the water delivery pipeline 8. When it is necessary to supply purified water to users, the solenoid valves 9 on the water supply pipeline 3 and the water delivery pipeline 8 are opened, and the solenoid valves 9 on the sewage discharge pipeline 5 and the cleaning pipeline 4 are closed.

[0064] When self-cleaning of the multi-stage filter element 1 is required, the solenoid valves 9 on the water supply pipeline 3 and the water delivery pipeline 8 are closed. According to the above two implementation methods, when it is necessary to clean a certain stage of the filter element, the solenoid valves 9 on the corresponding cleaning pipeline 4 and the sewage discharge pipeline 5 are opened, so that the filtering system can realize two functions of filtering and self-cleaning.

[0065] Furthermore, since in this application, solenoid valves 9 are provided on the water supply pipeline 3, the sewage discharge pipeline 5, the cleaning pipeline 4 and the water delivery pipeline 8, when the solenoid valves 9 are closed instantaneously, a water hammer effect will be generated on the corresponding pipelines, thereby impacting the pipelines and affecting the service life of the pipelines, and further affecting the service life of the filtering system and increasing the use cost of the water purifier.

[0066] Therefore, in this application, a water hammer elimination device is provided on each solenoid valve 9. When the solenoid valve 9 is closed and the water flow on the corresponding pipeline is suddenly cut off, the water hammer elimination device provided on the solenoid valve 9 eliminates the huge instantaneous water pressure generated by the water flow in the pipeline due to the water hammer effect, thereby protecting the pipeline and the solenoid valve 9, reducing the damage caused by the water hammer effect to the pipeline and the solenoid valve 9, and further extending the service life of the filtering system and reducing the use cost of the water purifier. Specifically, for the structure of the solenoid valve 9 and the water hammer elimination device, reference can be made to the Chinese utility model patent with the publication number CN201116607Y and the patent name of an ultra-thin piston with a guide rod solenoid valve 9.

[0067] This embodiment of the utility model also provides a water purifier, including the above-mentioned filtering system with a self-cleaning function.

[0068] The content described above can be implemented alone or in various combinations, and these variant ways are all within the protection scope of the utility model.

[0069] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A filtration system with self-cleaning function, characterized in that: The invention comprises a multi-stage filter element (1) for filtering water, a water storage tank (2) for storing water filtered by the multi-stage filter element (1), a water supply pipeline (3) for supplying water to the multi-stage filter element (1), a cleaning pipeline (4) for backwashing the multi-stage filter element (1), and a sewage discharge pipeline (5) for discharging cleaned waste water; the water supply pipeline (3) is connected to the multi-stage filter element (1), and the cleaning pipeline (4) connects the water storage tank (2) and the multi-stage filter element (1).

2. A filtration system with self-cleaning function as claimed in claim 1, characterized in that: The filtration system further comprises a connecting pipeline (6) for sequentially connecting the multi-stage filter elements (1), a filtration pipeline (7) for conveying water filtered by the multi-stage filter elements (1) to the water storage tank (2), and a water delivery pipeline (8) for outputting the water in the water storage tank (2) for use by a user.

3. A filtration system with self-cleaning function as claimed in claim 2, characterized in that: The multi-stage filter element (1) comprises a primary filter element (11), a secondary filter element (12), a tertiary filter element (13) and a quaternary filter element (14); the primary filter element (11) is used for coarse filtering of water; the secondary filter element (12) and the tertiary filter element (13) are used for ultrafiltration of water; the quaternary filter element (14) is used for reverse osmosis filtration of water; the water supply pipeline (3) is connected to the primary filter element (11); and the filtration pipeline (7) connects the quaternary filter element (14) to the water storage tank (2).

4. A filtration system with self-cleaning function as claimed in claim 3, characterized in that: The primary filter element (11) comprises a first filter cartridge (111) and a first filter screen (112) arranged in the first filter cartridge (111); the secondary filter element (12) and the tertiary filter element (13) comprise a second filter cartridge (121), a second filter screen (122) arranged in the second filter cartridge (121), and a filter membrane (123) arranged outside the second filter screen (122); the quaternary filter element (14) comprises a third filter cartridge (141), a third filter screen (142) arranged in the third filter cartridge (141), and a reverse osmosis membrane (143) arranged outside the third filter screen (142).

5. A filtering system with self-cleaning function as claimed in claim 3, characterized in that: The cleaning pipeline (4) comprises a main pipe (41) connected to the water storage tank (2), a first sub-pipe (42) having one end connected to the main pipe (41) and the other end connected to the secondary filter element (12), and a second sub-pipe (43) having one end connected to the main pipe (41) and the other end connected to the fourth-stage filter element (14). The main pipe (41) is provided with a driving device for driving the water to flow.

6. A filtering system with self-cleaning function as claimed in claim 5, characterized in that: The connecting pipeline (6) comprises a first connecting pipe (61) connecting the primary filter element (11) with the secondary filter element (12), a second connecting pipe (62) connecting the secondary filter element (12) with the tertiary filter element (13), and a third connecting pipe (63) connecting the tertiary filter element (13) with the quaternary filter element (14); the sewage discharge pipeline (5) comprises a first sewage discharge pipe (51) arranged on the water supply pipeline (3), and a second sewage discharge pipe (52) arranged on the second connecting pipe (62).

7. A filtering system with self-cleaning function as claimed in claim 3, characterized in that: The cleaning pipeline (4) comprises a main pipe (41) connected to the water storage tank (2), a first sub-pipe (42) having one end connected to the main pipe (41) and the other end connected to the primary filter element (11), a second sub-pipe (43) having one end connected to the main pipe (41) and the other end connected to the secondary filter element (12), a third sub-pipe (44) having one end connected to the main pipe (41) and the other end connected to the tertiary filter element (13), and a fourth sub-pipe (45) having one end connected to the main pipe (41) and the other end connected to the quaternary filter element (14).

8. A filtering system with self-cleaning function as claimed in claim 7, characterized in that: The connecting pipeline (6) comprises a first connecting pipe (61) connecting the primary filter element (11) with the secondary filter element (12), a second connecting pipe (62) connecting the secondary filter element (12) with the tertiary filter element (13), and a third connecting pipe (63) connecting the tertiary filter element (13) with the quaternary filter element (14); the sewage discharge pipeline (5) comprises a first sewage discharge pipe (51) arranged on the water supply pipeline (3), a second sewage discharge pipe (52) arranged on the first connecting pipe (61), a third sewage discharge pipe (53) arranged on the second connecting pipe (62), and a fourth sewage discharge pipe (54) arranged on the third connecting pipe (63).

9. A filtering system with self-cleaning function as claimed in claim 2, characterized in that: The water supply pipeline (3), the cleaning pipeline (4), the sewage discharge pipeline (5) and the water delivery pipeline (8) are all provided with electromagnetic valves (9) for controlling the opening or closing of the pipelines. The electromagnetic valves (9) are all provided with water hammer elimination devices. The water hammer elimination devices are used to eliminate the water hammer effect on the pipelines when the electromagnetic valves (9) are closed.

10. A water purifier, characterized in that: A filter system with a self-cleaning function comprising the filter system as claimed in any one of claims 1 to 9.

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