Central water purifier

Abstract

The utility model discloses a central water purifier, which relates to the technical field of purification equipment, and comprises a valve body, a filter bottle, a primary filter component and a secondary filter component, and the valve body is provided with an inlet end and an outlet end; the filter bottle is connected with the valve body; the primary filter assembly is arranged in the filter bottle and comprises a lower sleeve and a filter part, the filter part is arranged in the lower sleeve, a first filter cavity is formed between the filter part and the lower sleeve, and the first filter cavity is communicated with an inner cavity of the filter part; the secondary filter assembly is arranged in the filter bottle and comprises an upper sleeve and a filter element, the filter element is arranged in the upper sleeve, a second filter cavity is formed between the upper sleeve and the filter element, and the second filter cavity is communicated with the inner cavity of the filter element. According to the central water purifier, the filtering piece in the first-stage filtering assembly intercepts large-particle objects and can maintain the filter element, so that the filter element is not prone to being blocked, the service life of the filter element is prolonged, the filter element is not prone to being blocked even in a place with poor water quality, the service life of the central water purifier is prolonged, and the use experience of the central water purifier is improved.

Description

Technical Field

[0001] This utility model relates to the field of purification equipment technology, and in particular to a central water purifier. Background Technology

[0002] The city's water supply pipelines are old and long. Rust, silt and other impurities in the pipelines can cause water-using equipment to malfunction. Therefore, pre-filters are usually installed on the inlet pipes to improve the water quality and ensure the water supply to downstream users.

[0003] A central water purifier is the first stage of purification for all the water used in a house. It can filter out sediment, rust, large particles, and other impurities from tap water, preventing the large amount of sediment and impurities generated in the urban and residential water supply network from causing harm to the human body. It also plays a positive role in protecting concealed pipes, faucets, plumbing, water heaters, boilers, central air conditioning, washing machines, dishwashers, coffee machines, and other water appliances (such as water purifiers, reverse osmosis systems, and water softeners).

[0004] Existing central water purifiers are installed in the main water supply pipe. The machine has a composite filter inside. Although the filtration accuracy is high, the composite filter is easily clogged in areas with poor water quality. Moreover, maintenance is difficult and can only be done by replacement, which reduces the lifespan of the central water purifier and the user experience. Utility Model Content

[0005] The purpose of this invention is to provide a central water purifier that solves the technical problem that existing central water purifiers are prone to clogging of the composite filter element in areas with poor water quality, thus reducing the lifespan of the central water purifier and the user experience.

[0006] To achieve the above objectives, this utility model provides a central water purifier, comprising:

[0007] The valve body has an inlet end and an outlet end;

[0008] The filter bottle is connected to the valve body;

[0009] A primary filtration assembly, disposed within the filter bottle, includes a lower sleeve and a filter element. The filter element is disposed within the lower sleeve, and a first filtration chamber is formed between the filter element and the lower sleeve. The first filtration chamber communicates with the inner chamber of the filter element.

[0010] A secondary filtration assembly is disposed inside the filter bottle and includes an upper sleeve and a filter element. The filter element is disposed inside the upper sleeve, and a second filtration chamber is formed between the upper sleeve and the filter element. The second filtration chamber communicates with the inner chamber of the filter element.

[0011] Preferably, the filter element comprises:

[0012] The inner frame has oblique water holes on its side along the axial direction, and the oblique water holes are used to connect the first filter chamber and the inner cavity of the inner frame;

[0013] The laminate assembly includes multiple laminates sleeved outside the inner frame, and the upper end of each laminate is provided with a drainage hole;

[0014] The water distributor is connected to the upper sleeve and the inner frame, and the water distributor is located at the bottom of the second filter chamber.

[0015] Preferably, it further includes a switching component for switching between filtration and backwashing states. The switching component is movably disposed within the first filtration chamber, and the top of the switching component extends into the upper sleeve.

[0016] Preferably, the switching component includes:

[0017] The bottom cover is located below the inner frame, and its upper end face is used to abut against the bottom of the stacked assembly;

[0018] The switching component is fixedly connected to the bottom cover, and its top extends into the upper sleeve and is slidably connected to the upper sleeve. The switching component is provided with a backwash water port.

[0019] An elastic element is disposed between the switching element and the inner frame, and is used to reset the switching element during filtering.

[0020] Preferably, the water distributor is provided with an inlet and a outlet. In the filtration state, the inlet is connected to the first filter chamber through the outlet. In the backwashing state, the switching element blocks the outlet, and the inner chamber of the filter element is connected to the inlet through the backwash water hole of the switching element.

[0021] Preferably, a backwashing screen is provided at the backwashing water hole to intercept impurities during backwashing.

[0022] Preferably, the bottom cover is provided with a drain hole along the circumference for discharging sewage during backwashing.

[0023] Preferably, a sealing element is installed at the bottom end of the filter bottle, the sealing element abuts against the bottom of the lower sleeve, and a ball valve is provided at the bottom end of the sealing element.

[0024] Preferably, the bottom of the upper sleeve is provided with a first annular groove, the inner wall of the water distributor is provided with a first buckle, and the water distributor and the upper sleeve are connected through the first annular groove and the first buckle.

[0025] Preferably, the lower end of the water distributor is provided with a second buckle, and the upper part of the inner frame is provided with a second annular groove. The water distributor and the inner frame are connected through the second buckle and the second annular groove.

[0026] Compared to the aforementioned background technology, the central water purifier provided by this utility model allows liquid to first enter the first filtration chamber formed by the filter element and the lower sleeve. The filter element performs primary filtration, intercepting large particles and impurities, colloids, and insect eggs that could damage the filter element in the secondary filtration assembly. After primary filtration, the liquid enters the second filtration chamber formed between the upper sleeve and the filter element, where it undergoes secondary fine filtration, achieving water purification. The primary and secondary filtration assemblies perform two stages of filtration. The filter element in the primary filtration assembly intercepts large particles and impurities, colloids, and insect eggs that could damage the filter element in the secondary filtration assembly, thus protecting the filter element, preventing clogging, and extending its lifespan. Even in areas with poor water quality, the filter element is less prone to clogging, improving the lifespan of the central water purifier and the user experience. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0028] Figure 1 A cross-sectional structural diagram of the central water purifier provided in an embodiment of this utility model;

[0029] Figure 2 This is a cross-sectional view of the valve body in a central water purifier provided in an embodiment of the present invention.

[0030] Figure 3 A cross-sectional view of the upper sleeve in the central water purifier provided in this embodiment of the utility model;

[0031] Figure 4 A cross-sectional structural diagram of the water distributor in the central water purifier provided in an embodiment of this utility model;

[0032] Figure 5 This is a schematic diagram of the stacked plates in the central water purifier provided in an embodiment of the present utility model;

[0033] Figure 6 This is a schematic diagram of the structure of the bottom cover of the central water purifier provided in an embodiment of the present utility model;

[0034] Figure 7 A cross-sectional view of the switching component in the central water purifier provided in this embodiment of the utility model;

[0035] Figure 8A schematic diagram of the internal frame of the central water purifier provided in this embodiment of the utility model;

[0036] Figure 9 A cross-sectional view of the inner frame of the central water purifier provided in this embodiment of the utility model;

[0037] Figure 10 A schematic diagram illustrating the filtration state of a central water purifier provided in an embodiment of this utility model;

[0038] Figure 11 This is a schematic diagram of the backwashing state of the central water purifier provided in an embodiment of the present invention.

[0039] Figures 1 to 11 Chinese reference numerals: 1. Valve body; 101. Inlet end; 102. Outlet end; 103. First threaded part; 104. First annular groove; 2. Isolating element; 3. Fixing element; 4. Upper sleeve; 401. First annular groove; 402. Rib; 5. Filter bottle; 6. Water distributor; 601. Water inlet; 602. Water passage hole; 603. First snap; 604. Second snap; 605. Second annular groove; 7. Lower sleeve; 8. Disc; 801. Drain hole; 9. Bottom cover ; 901, Second threaded part; 902, Drain hole; 903, Third annular groove; 10, Seal; 11, Ball valve; 12, Switching part; 1201, Backwash water inlet; 1202, Backwash water hole; 1203, Annular flange; 1204, Third threaded part; 1205, Fourth annular groove; 13, Inner skeleton; 1301, Inclined water hole; 1302, Second annular groove; 14, Elastic element; 15, Filter element; 16, First filter chamber; 17, Second filter chamber. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] This utility model provides a central water purifier that combines a two-stage filtration system. The first-stage filtration component intercepts large particles, while the second-stage filtration component is protected against impurities, colloids, insect eggs, etc., which can cause significant damage. By maintaining the second-stage filtration component, the service life of the filter element 15 is extended. Even in areas with poor water quality, the filter element 15 is less prone to clogging, thus extending its service life and improving the lifespan and user experience of the central water purifier.

[0043] Please refer to this as well. Figures 1 to 11 The central water purifier provided by this utility model includes a valve body 1, a filter bottle 5, a primary filtration component and a secondary filtration component.

[0044] The valve body 1 has an inlet end 101 and an outlet end 102, which correspond to the inlet and outlet of the liquid being filtered by the central water purifier. This liquid can be water or other mixtures or other liquids that need to be filtered. Furthermore, both the inlet end 101 and the outlet end 102 are used to connect to the liquid supply pipeline, such as indoor water pipes. The threads at the inlet end 101 and the outlet end 102 of the valve body 1 are used to connect the valve body 1 to a pre-installed union.

[0045] The filter bottle 5 is connected to the valve body 1. Optionally, the filter bottle 5 is provided with a fixing member 3, and the valve body 1 is fixedly connected to the filter bottle 5 through the fixing member 3. The valve body 1 is provided with a first threaded part 103, which is an external thread. The fixing member 3 is provided with an internal thread, thereby threading the fixing member 3 to the valve body 1, which is convenient for installation and disassembly.

[0046] A primary filtration assembly is located inside the filter bottle 5 for primary filtration. The primary filtration assembly includes a lower sleeve 7 and a filter element. The lower sleeve 7 is located in the lower part of the filter bottle 5, and the filter element is located inside the lower sleeve 7. A first filtration chamber 16 is formed between the filter element and the lower sleeve 7, and the first filtration chamber 16 communicates with the inner chamber of the filter element. The upper sleeve 4 can be a transparent structure to facilitate user observation of the internal filtration process.

[0047] A secondary filtration assembly is located inside the filter bottle 5 for secondary filtration. The secondary filtration assembly includes an upper sleeve 4 and a filter element 15. The upper sleeve 4 is located at the upper part of the filter bottle 5, and the filter element 15 is located inside the upper sleeve 4. A second filtration chamber 17 is formed between the upper sleeve 4 and the filter element 15, and the second filtration chamber 17 communicates with the inner chamber of the filter element 15. The filter element 15 can filter fine impurities. The filter element 15 is a composite filter element, which can be made of pleated membrane + PP cotton, pleated membrane + carbon fiber, PP cotton + carbon rod, etc., and has a long service life. The upper sleeve 4 has a first annular groove 104 for placing sealing components to improve the sealing effect and prevent liquid leakage. The sealing components can be sealing rings, sealing rings, etc. The upper sleeve 4 can also be provided with ribs 402 to support the filter element 15 and achieve the installation and fixation of the filter element 15. In addition, the upper sleeve 4 can be transparent to allow the user to observe the internal condition of the filter element 15.

[0048] In use, the liquid enters the filter bottle 5 through the inlet end 101 of the valve body 1. The liquid entering the filter bottle 5 first enters the first filtration chamber 16 formed by the filter element and the lower sleeve 7. The liquid undergoes primary filtration through the filter element, intercepting large particles and impurities, colloids, insect eggs, etc. that may cause significant damage to the filter element 15 in the secondary filtration assembly. After primary filtration, the liquid enters the second filtration chamber 17 formed between the upper sleeve 4 and the filter element 15, where it undergoes secondary fine filtration through the filter element 15, achieving the effect of purifying the water quality.

[0049] With this setup, the primary and secondary filtration components perform two-stage filtration of the liquid. The filter elements in the primary filtration component intercept large particles and impurities, colloids, insect eggs, etc., that can cause significant damage to the filter element 15 in the secondary filtration component. This helps maintain the filter element 15, making it less prone to clogging and extending its service life. Even in areas with poor water quality, the filter element 15 is less likely to clog, thus improving the lifespan and user experience of the central water purifier.

[0050] Please refer to this as well. Figure 1 , Figures 4 to 5 as well as Figure 9 The filter element includes an inner frame 13, a stacked disc 8 assembly, and a water distributor 6.

[0051] The inner frame 13 has inclined water holes 1301 on its side along the axial direction. The inclined water holes 1301 are used to connect the first filter chamber 16 and the inner cavity of the inner frame 13. There are multiple inclined water holes 1301, which connect the first filter chamber 16 and the inner cavity of the inner frame 13.

[0052] The stacked plate assembly includes multiple stacked plates 8 fitted outside the inner frame 13. The inner frame 13 provides support for the stacked plates 8, and the upper end of the stacked plates 8 is provided with a drain hole 801. During filtration, multiple stacked plates 8 are stacked together in an irregular pattern, and the cross-sections of the drain holes 801 are not uniform, forming a complex network of water holes.

[0053] The water distributor 6 is connected to the upper sleeve 4 and the inner frame 13, and the water distributor 6 is located at the bottom of the second filter chamber 17.

[0054] During primary filtration, the liquid passes through the gap between the upper sleeve 4 and the filter bottle 5 and enters the first filtration chamber 16 through the water distributor 6. The water distributor 6 ensures that the liquid enters the first filtration chamber 16 evenly. The liquid is filtered through multiple stacked discs 8, intercepting large particles and impurities, colloids, insect eggs, etc., that could damage the filter element 15 in the secondary filtration assembly. The liquid after primary filtration enters the interior of the inner frame 13 through the inclined water holes 1301, and then enters the second filtration chamber 17, where it undergoes fine filtration through the filter element 15.

[0055] The water distributor 6 is equipped with a second annular groove 605, which is used to place a sealing component to improve the sealing effect and prevent liquid leakage. The sealing component can be a sealing ring, sealing ring, etc.

[0056] Please refer to this as well. Figure 1 The central water purifier provided by this utility model also includes a switching component for switching between filtration and backwashing states. The switching component is movably disposed within the first filtration chamber 16, and its top extends into the upper sleeve 4. In filtration state, the liquid undergoes primary filtration followed by secondary filtration, and the liquid after secondary filtration flows out through the outlet end 102 of the valve body 1. After filtration for a period of time, the switching component can switch the central water purifier from filtration state to backwashing state, backwashing the discs 8 in the primary filtration component to remove intercepted impurities, thus performing a maintenance function, ensuring filtration effect, and extending the service life of the central water purifier.

[0057] Please refer to this as well. Figure 1 , Figures 6 to 7 The switching assembly includes a bottom cover 9, a switching element 12, and an elastic element 14.

[0058] The bottom cover 9 is located below the inner frame 13, and its upper surface is used to abut against the bottom of the stacked assembly.

[0059] The switching component 12 is fixedly connected to the bottom cover 9. The top of the switching component 12 extends into the upper sleeve 4 and is slidably connected to the upper sleeve 4. The switching component 12 is provided with a backwash water port 1201.

[0060] The elastic element 14 is located between the switching element 12 and the inner frame 13, and is used to reset the switching element 12 during filtration. The elastic element 14 can be a spring.

[0061] In filtration mode, the upper surface of the bottom cover 9 abuts against the multiple overlapping lower surfaces. Under the action of the bottom cover 9, the stacked discs 8 are pressed together, thus enabling the liquid to filter as it flows through the drain hole 801, intercepting large particles and impurities, colloids, insect eggs, etc., that could cause significant damage to the filter element 15 in the secondary filtration assembly. In backwashing mode, the bottom cover 9 and the switching element 12 move downwards, the elastic element 14 is compressed, and the upper surface of the bottom cover 9 no longer abuts against the stacked discs 8. The stacked discs 8 can be axially released and rotated, resulting in a more thorough and complete rinsing. During filtration, the stacked discs 8 can return to their original state under the reset action of the elastic element 14.

[0062] In addition, the bottom cover 9 has a second threaded part 901 in the center, which is an internal thread, and the lower end of the switching part 12 has a third threaded part 1204, which is an external thread. The bottom cover 9 and the switching part 12 are threadedly connected through the cooperation of the second threaded part 901 and the third threaded part 1204.

[0063] Optionally, the bottom cover 9 is provided with a third annular groove 903, and the switching component 12 is provided with a fourth annular groove 1205. The third annular groove 903 and the fourth annular groove 1205 are used to place sealing components to improve the sealing effect and prevent liquid leakage. The sealing components can be sealing rings, sealing rings, etc.

[0064] Please refer to this as well. Figure 1 as well as Figure 4 The water distributor 6 is provided with an inlet hole 601 and a through hole 602. In the filtration state, the inlet hole 601 is connected to the first filter chamber 16 through the through hole 602. In the backwashing state, the switching element 12 blocks the through hole 602, and the inner chamber of the filter element is connected to the inlet hole 601 through the backwash water hole 1202 of the switching element 12.

[0065] The distributor 6 has multiple inclined blades evenly arranged around its circumference, with a water passage hole 602 formed between two connected inclined blades. This arrangement allows the liquid to enter evenly. The switching element 12 has an annular flange 1203. In the backwashing state, the bottom cover 9 moves the switching element 12 downward, and the annular flange 1203 of the switching element 12 blocks the water passage hole 602 of the distributor 6. The backwash water hole 1202 of the switching element 12 is exposed from inside the upper sleeve 4, and the inner chamber of the filter element is connected to the water inlet 601 through the backwash water hole 1202 of the switching element 12.

[0066] Optionally, a backwashing screen is provided at the backwash water hole 1202 to intercept impurities during backwashing. During backwashing, water flows from the inner chamber of the filter element to the first filter chamber 16. By providing the backwashing screen, impurities filtered out by the stacked disc 8 assembly can be intercepted, preventing these impurities from entering the interior of the filter element through the backwash water hole 1202. This provides protection for the filter element and the filter element 15 of the secondary filter assembly, extending the service life of the filter element and filter element 15.

[0067] Please refer to this as well. Figure 1 as well as Figure 6 The bottom cover 9 is provided with a drain hole 902 along the circumference for discharging sewage in the backwashing state. During backwashing, the water flows from the inner chamber of the filter element to the first filter chamber 16. The water flows from the inclined water hole 1301 of the inner frame 13 to the outside horizontally and can drive the stacked plates 8 to rotate. Impurities and mud are quickly flushed out and finally discharged through the drain hole 902.

[0068] Please refer to this as well. Figure 1 A sealing element 10 is installed at the bottom of the filter bottle 5, and the sealing element 10 abuts against the bottom of the lower sleeve 7. A ball valve 11 is provided at the bottom of the sealing element 10. By sealing the lower sleeve 7 against the lower sleeve 7, the lower sleeve 7 is fixedly installed inside the filter bottle 5. In the filtration state, the ball valve 11 is in the closed state. After the ball valve 11 is opened, under the action of negative pressure, the bottom cover 9 drives the switching element 12 to move down, the elastic element 14 is compressed, and the upper end face of the bottom cover 9 no longer abuts against the stacked discs 8. The stacked discs 8 can be axially released and can be rotated, thereby switching to the backwashing state.

[0069] Please refer to this as well. Figures 1 to 4 The upper sleeve 4 has a first annular groove 401 at its bottom, and the inner wall of the water distributor 6 has a first buckle 603. The water distributor 6 and the upper sleeve 4 are connected by the first annular groove 401 and the first buckle 603.

[0070] Please refer to this as well. Figure 1 , Figure 4 and Figure 8 The lower end of the water distributor 6 is provided with a second buckle 604, and the upper part of the inner frame 13 is provided with a second annular groove 1302. The water distributor 6 and the inner frame 13 are connected by the second buckle 604 and the second annular groove 1302.

[0071] In some of these embodiments, please refer to the following: Figures 1 to 2 The valve body 1 has an isolation element 2 inside, which is located on the inner wall of the valve body 1. It is used to isolate the inner wall of the valve body 1 from the liquid and prevent the leaching of heavy metal substances from the valve body 1, thus avoiding contamination. Specifically, the isolation element 2 is made of inert material and can be applied to the inner wall of the valve body 1 using injection molding, welding, or other processes.

[0072] The following is a detailed description of the filtration and backwashing process of the central water purifier provided by this utility model: Please refer to the following: Figures 1 to 11 During filtration, the liquid enters the filter bottle 5 through the inlet pipe and the inlet end 101 of the valve body 1. The liquid entering the filter bottle 5 first enters the first filtration chamber 16 formed by the filter element and the lower sleeve 7 through the inlet hole 601 and the outlet hole 602 of the water distributor 6. It is filtered by the compressed discs 8, which intercept large particles and impurities, colloids, insect eggs, etc. that may cause damage to the filter element 15 in the secondary filtration assembly. After the first-stage filtration, the liquid enters the second filtration chamber 17 formed between the upper sleeve 4 and the filter element 15. It undergoes secondary fine filtration through the filter element 15 to achieve the effect of purifying the water quality. The liquid after the second-stage filtration flows out from the outlet end 102 of the valve body 1.

[0073] After the ball valve 11 is opened, under the action of negative pressure, the bottom cover 9 drives the switching element 12 to move down, the elastic element 14 is compressed, the upper end face of the bottom cover 9 no longer presses against the stacked plate 8, the stacked plate 8 can be released axially and rotated, thus switching to the backwash state. During backwashing, the annular flange 1203 of the switching element 12 blocks the water passage 602 of the water distributor 6, the backwash water hole 1202 of the switching element 12 is exposed from the inside of the upper sleeve 4, the inner cavity of the filter element is connected to the water inlet 601 through the backwash water hole 1202 of the switching element 12, the water flows from the inner cavity of the filter element to the first filter chamber 16, the water flows from the inside to the outside through the inclined water hole 1301 of the inner frame 13 and can drive the stacked plate 8 to rotate, impurities and mud are quickly flushed out, and finally discharged through the drain hole 902 and the ball valve 11.

[0074] The aforementioned central water purifier performs two-stage filtration of liquids through a primary filtration component and a secondary filtration component. The filter element in the primary filtration component intercepts large particles and impurities, colloids, insect eggs, etc., that can cause significant damage to the filter element 15 in the secondary filtration component. This helps maintain the filter element 15, making it less prone to clogging and extending its service life. Even in areas with poor water quality, the filter element 15 is less likely to clog, thus improving the lifespan of the central water purifier and the user experience.

[0075] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0076] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A central water purifier, characterized in that, include: The valve body (1) is provided with an inlet end (101) and an outlet end (102); The filter bottle (5) is connected to the valve body (1); A primary filtration assembly is disposed within the filter bottle (5) and includes a lower sleeve (7) and a filter element. The filter element is disposed within the lower sleeve (7), and a first filtration chamber (16) is formed between the filter element and the lower sleeve (7). The first filtration chamber (16) is connected to the inner chamber of the filter element. A secondary filtration assembly is disposed inside the filter bottle (5) and includes an upper sleeve (4) and a filter element (15). The filter element (15) is disposed inside the upper sleeve (4). A second filtration chamber (17) is formed between the upper sleeve (4) and the filter element (15). The second filtration chamber (17) is connected to the inner chamber of the filter element (15).

2. The central water purifier according to claim 1, characterized in that, The filter element includes: The inner frame (13) has inclined water holes (1301) on its side along the axial direction. The inclined water holes (1301) are used to connect the first filter chamber (16) and the inner cavity of the inner frame (13). The stacked assembly includes multiple stacked pieces (8) sleeved outside the inner frame (13), and the upper end of the stacked pieces (8) is provided with a drainage hole (801); The water distributor (6) is connected to the upper sleeve (4) and the inner frame (13), and the water distributor (6) is located at the bottom of the second filter chamber (17).

3. The central water purifier according to claim 2, characterized in that, It also includes a switching component for switching between filtration and backwashing states. The switching component is movably disposed within the first filtration chamber (16), and the top of the switching component extends into the upper sleeve (4).

4. The central water purifier according to claim 3, characterized in that, The switching component includes: The bottom cover (9) is located below the inner frame (13), and its upper end face is used to abut against the bottom of the stacked assembly; The switching component (12) is fixedly connected to the bottom cover (9), and its top extends into the upper sleeve (4) and is slidably connected to the upper sleeve (4). The switching component (12) is provided with a backwash water inlet (1201). An elastic element (14) is disposed between the switching element (12) and the inner frame (13) for resetting the switching element (12) during filtering.

5. The central water purifier according to claim 4, characterized in that, The water distributor (6) is provided with an inlet hole (601) and a through hole (602). In the filtration state, the inlet hole (601) is connected to the first filter chamber (16) through the through hole (602). In the backwashing state, the switching element (12) blocks the through hole (602), and the inner chamber of the filter element is connected to the inlet hole (601) through the backwash water hole (1202) of the switching element (12).

6. The central water purifier according to claim 5, characterized in that, A backwashing screen is provided at the backwashing water hole (1202) to intercept impurities during backwashing.

7. The central water purifier according to claim 6, characterized in that, The bottom cover (9) is provided with a drain hole (902) along the circumference for discharging sewage during backwashing.

8. The central water purifier according to any one of claims 2 to 7, characterized in that, A sealing element (10) is installed at the bottom end of the filter bottle (5), the sealing element (10) abuts against the bottom of the lower sleeve (7), and a ball valve (11) is provided at the bottom end of the sealing element (10).

9. The central water purifier according to claim 8, characterized in that, The upper sleeve (4) has a first annular groove (401) at its bottom, and the inner wall of the water distributor (6) has a first buckle (603). The water distributor (6) and the upper sleeve (4) are connected by the first annular groove (401) and the first buckle (603).

10. The central water purifier according to claim 9, characterized in that, The lower end of the water distributor (6) is provided with a second buckle (604), and the upper part of the inner frame (13) is provided with a second annular groove (1302). The water distributor (6) and the inner frame (13) are connected by the second buckle (604) and the second annular groove (1302).

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