CN113929160B

CN113929160B - Filter element, water purification system and water purifier

Info

Publication number: CN113929160B
Application number: CN202010609481.1A
Authority: CN
Inventors: 何明
Original assignee: Midea Group Co Ltd; Foshan Shunde Midea Water Dispenser Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Foshan Shunde Midea Water Dispenser Manufacturing Co Ltd
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2023-09-08
Anticipated expiration: 2040-06-29
Also published as: CN113929160A

Abstract

The invention provides a filter element, a water purification system and a water purifier, wherein a water inlet and a water outlet of the filter element (40) are respectively provided with a check valve, the check valve comprises a valve element (33) and a valve element elastic reset piece (34) used for resetting the valve element (33), when the valve element (33) is not subjected to external force, the valve element (33) is in a sealing position by the elasticity of the valve element elastic reset piece (34) so as to seal the water inlet and the water outlet, and when the valve element (33) is subjected to inward thrust, the valve element (33) leaves the sealing position so as to be communicated with the water inlet and the water outlet. The filter element can automatically seal the water inlet and the water outlet when being replaced, and the residual water in the filter element is prevented from being discharged out of the pollution cabinet.

Description

Filter element, water purification system and water purifier

Technical Field

The invention relates to a water supply facility, in particular to a filter element. In addition, the invention also relates to a water purifying system and a water purifier comprising the filter element.

Background

The water purifier takes tap water as water inlet, and can obtain drinking water through filtering by different filter elements. The drinking water of the water purifier reaches the purified water level and can be directly drunk. Domestic water of water purifiers in the market is generally filtered by various filter cores, such as a PP cotton filter core, an active carbon filter core, an ultrafiltration membrane filter core, a reverse osmosis membrane filter core or a composite filter core with the same function.

However, after the filter element of the water purifier is used for a period of time, the filter element needs to be replaced to ensure the filtering effect of the water purifier. For example, the PP cotton filter core plays a role in filtering large-particle impurities such as sediment and colloid, and after a period of use, the filter core has accumulated a large amount of sediment, extremely influences the filtering effect, reduces the service efficiency of the following filter core, so that the filter core must be replaced in time. The replacement period recommended by the manufacturer is 6 to 12 months, and the filter element needs to be replaced in 3 months in some areas with poor water quality. Therefore, filter element replacement is a function that must be considered in the design and use of the water purifier.

The existing water purifier is generally installed by the after-sales personnel to get on the door, and the after-sales personnel is required to get on the door to replace when the filter element is replaced. As shown in fig. 85: the front three-stage filtration of the water purifier consists of a filter bottle cap 1', a filter bottle 2' and a filter element 3', wherein the filter bottle 2' is connected with the filter bottle cap 1' through threads, when the filter element is replaced, a special spanner is required to be used for disassembling and screwing the filter bottle 2', the old filter element 3' is taken out, a new filter element 3' is placed, and the filter bottle 2' is screwed by the special spanner. When the filter flask 2 'is unscrewed, the residual water in the filter flask 2' can be easily spilled, which causes trouble to users.

Disclosure of Invention

The first aspect of the present invention aims to provide a filter element, which can avoid draining residual water and keep a cabinet clean when the filter element is replaced.

The technical problem to be solved by the second aspect of the present invention is to provide a water purifying system, in which the filter element of the water purifying system can avoid draining residual water during replacement, and keep the cabinet clean.

The invention provides a water purifier, wherein a filter element of the water purifier can avoid draining residual water during replacement, and a cabinet is kept clean.

In order to solve the technical problem, a first aspect of the present invention provides a filter element, in which a water inlet and a water outlet of the filter element are respectively provided with a check valve, the check valve includes a valve element and a valve element elastic reset member for resetting the valve element, when the valve element is not subjected to an external force, the valve element is in a sealing position by the elasticity of the valve element elastic reset member to seal the water inlet and the water outlet, and when the valve element is subjected to an inward thrust, the valve element is separated from the sealing position to communicate the water inlet and the water outlet.

Preferably, the sealing positions of the valve core in the water inlet and the water outlet of the filter element are provided with sealing matching structures of the valve core.

Preferably, the valve core is provided with a valve core sealing ring positioned in the circumferential direction of the valve core.

Further, the check valve further comprises a valve body and a valve cover, and the valve core elastic reset piece are located in a space surrounded by the valve body and the valve cover.

Furthermore, a valve body sealing ring is arranged on the outer wall of the valve body so as to realize the sealing between the valve body and the water inlet and the water outlet of the filter element.

Preferably, filter element sealing rings for installing and sealing the filter element are arranged on the inner walls of the water inlet and the water outlet, and cover plates for preventing the filter element sealing rings from falling out of the water inlet and the water outlet are arranged outside the water inlet and the water outlet.

In a second aspect, the present invention provides a water purification system comprising at least one filter cartridge as described above.

Preferably, the filter core is including leading filter core, main filter core and the rear-mounted filter core that connect gradually, leading filter core with be connected with water inlet solenoid valve and booster pump on the water route section between the main filter core, main filter core with be connected with first check valve on the water route section between the rear-mounted filter core, the waste water mouth of a river of main filter core with water purification system's waste water mouth of pipe is connected.

Further, the water outlet pipe orifice of the water purification system comprises a first water outlet pipe orifice and a second water outlet pipe orifice, wherein the first water outlet pipe orifice is connected to a water path section between the booster pump and the main filter element, and the second water outlet pipe orifice is communicated with a water outlet of the rear filter element.

Still further, be connected with the flushing solenoid valve on the water route section between main filter core and the waste water mouth of pipe, the post filter core with be connected with pressure switch on the water route section between the second water outlet mouth of pipe.

Preferably, the water outlet section of the rear filter element is communicated with the water outlet section of the water inlet electromagnetic valve through a backflow waterway, and the backflow waterway is provided with a second one-way valve and a backflow electromagnetic valve.

The third aspect of the invention provides a water purifier, which comprises the water purifying system.

Through the technical scheme, the invention has the following beneficial effects:

1. the water inlet and the water outlet of the filter element are provided with the check valves, when the filter element is not subjected to external force, the valve element elastic reset piece of the check valves enables the valve element to be in a sealing position to seal the water inlet and the water outlet, so that residual water in the filter element is prevented from being discharged out of a pollution cabinet, and when the valve element is subjected to inward thrust, the valve element leaves the sealing position to be communicated with the water inlet and the water outlet.

2. In the preferred scheme of the invention, the valve core and the reset piece thereof are arranged in the space surrounded by the valve body and the valve cover, so that the whole check valve is integrated before being installed in the water inlet and the water outlet of the filter element, the installation of the check valve is convenient, the original structure of the filter element is not required to be changed, the production cost can be reduced, and the application range of the check valve is wide.

Drawings

FIG. 1 is a schematic view of a check valve according to the present invention;

FIG. 2 is a perspective view of FIG. 1;

FIG. 3 is a cross-sectional view of FIG. 1;

FIG. 4 is a perspective view of FIG. 3;

FIG. 5 is an exploded view of the check valve of the present invention;

fig. 6 is a perspective view of fig. 5;

FIG. 7 is a schematic view of the structure of the spool of the check valve of the present invention;

FIG. 8 is a top view of FIG. 7;

FIG. 9 is a cross-sectional view of FIG. 7;

FIG. 10 is a schematic view of the structure of the valve body of the check valve of the present invention;

FIG. 11 is a top view of FIG. 10;

FIG. 12 is a cross-sectional view of FIG. 10;

FIG. 13 is a schematic view of the structure of a valve cover of the check valve of the present invention;

FIG. 14 is a top view of FIG. 13;

FIG. 15 is a cross-sectional view of FIG. 13;

FIG. 16 is a schematic view of the primary filter cartridge of the present invention;

FIG. 17 is a cross-sectional view of FIG. 16;

FIG. 18 is an exploded view of the main filter cartridge of the present invention;

FIG. 19 is a schematic view of the body of the main filter cartridge of the present invention;

FIG. 20 is a side view of FIG. 19;

FIG. 21 is a cross-sectional view of FIG. 19;

FIG. 22 is a schematic illustration of the membrane assembly of the primary filter cartridge of the present invention;

FIG. 23 is a cross-sectional view of FIG. 22;

FIG. 24 is an exploded view of the membrane assembly of the primary filter cartridge of the present invention;

FIG. 25 is a schematic view of the center tube of the main filter cartridge of the present invention;

FIG. 26 is a side view of FIG. 25;

FIG. 27 is a cross-sectional view of FIG. 25;

FIG. 28 is a schematic view of the filter cap of the main filter cartridge of the present invention;

FIG. 29 is a top view of FIG. 28;

FIG. 30 is a cross-sectional view of FIG. 29;

FIG. 31 is a schematic view of the decorative cover of the main filter cartridge of the present invention;

FIG. 32 is a top view of FIG. 31;

FIG. 33 is a cross-sectional view of FIG. 31;

FIG. 34 is a schematic view of the handle of the main filter cartridge of the present invention;

FIG. 35 is a top view of FIG. 34;

FIG. 36 is a cross-sectional view of FIG. 34;

FIG. 37 is a schematic view of the upper end cap of the membrane module of the primary filter cartridge of the present invention;

FIG. 38 is a top view of FIG. 37;

FIG. 39 is a cross-sectional view of FIG. 37;

FIG. 40 is a schematic view of the lower end cap of the membrane module of the primary filter cartridge of the present invention;

FIG. 41 is a top view of FIG. 40;

FIG. 42 is a cross-sectional view of FIG. 40;

FIG. 43 is a schematic view of the construction of the cover plate of the main filter cartridge of the present invention;

FIG. 44 is a rear view of FIG. 43;

FIG. 45 is a side view of FIG. 43;

FIG. 46 is a cross-sectional view of FIG. 43;

FIG. 47 is a schematic view of the construction of a pre-or post-cartridge of the present invention;

FIG. 48 is a cross-sectional view of FIG. 47;

FIG. 49 is an exploded view of a pre-or post-cartridge of the present invention;

FIG. 50 is a schematic view of the cartridge body of the pre-or post-cartridge of the present invention;

FIG. 51 is a side view of FIG. 50;

FIG. 52 is a cross-sectional view of FIG. 50;

FIG. 53 is a schematic view of a filter assembly of a pre-or post-cartridge of the present invention;

FIG. 54 is a cross-sectional view of FIG. 53;

FIG. 55 is an exploded view of a filter assembly of a pre-or post-cartridge of the present invention;

FIG. 56 is a schematic view of the structure of the filter cap of the pre-or post-cartridge of the present invention;

FIG. 57 is a top view of FIG. 56;

FIG. 58 is a cross-sectional view of FIG. 56;

FIG. 59 is a schematic view of the decorative cover of the pre-or post-cartridge of the present invention;

FIG. 60 is a top view of FIG. 59;

FIG. 61 is a cross-sectional view of FIG. 59;

FIG. 62 is a schematic view of the handle of the pre-or post-cartridge of the present invention;

FIG. 63 is a top view of FIG. 62;

FIG. 64 is a cross-sectional view of FIG. 62;

FIG. 65 is a schematic view of the structure of the upper end cap of the filter media of the pre-or post-cartridge of the present invention;

FIG. 66 is a top view of FIG. 65;

FIG. 67 is a cross-sectional view of FIG. 65;

FIG. 68 is a schematic view of the lower end cap of the filter media of the pre-or post-cartridge of the present invention;

FIG. 69 is a top view of FIG. 68;

FIG. 70 is a cross-sectional view of FIG. 68;

FIG. 71 is a schematic view of the cover plate of the pre-or post-cartridge of the present invention;

FIG. 72 is a rear view of FIG. 71;

FIG. 73 is a side view of FIG. 71;

FIG. 74 is a cross-sectional view of FIG. 71;

FIG. 75 is a perspective view of a pre-or post-cartridge of the present invention;

FIG. 76 is a cross-sectional view of FIG. 75;

FIG. 77 is a partially exploded view of 75;

FIG. 78 is a cross-sectional view of a water purification system of the present invention;

FIG. 79 is an enlarged schematic view at A in FIG. 78;

FIG. 80 is a schematic diagram of a waterway of an embodiment of a water purification system in accordance with the present invention;

FIG. 81 is an external view of a water purifier according to the present invention;

FIG. 82 is a schematic view of the water purifier of the present invention with the front cover open;

FIG. 83 is a schematic view showing the structure of the water purifying system of the water purifier according to the present invention, which is detached from the housing;

FIG. 84 is a schematic view of the water purification system of FIG. 83 with the filter cartridge and waterway plate omitted;

fig. 85 is a schematic structural diagram of a bare chip water purifier in the prior art.

Description of the invention with reference numerals

121 wastewater pipe orifices, 122 first water outlet pipe orifices, 123 second water outlet pipe orifices, 13 filter element water inlet connectors and 14 filter element water outlet connectors;

21 center rod, 211 center rod shoulder, 22 elastic return piece, 23 sealing ring, 24 sealing piece;

31 valve body, 311 sealing fit structure, 32 valve cap, 33 valve core, 34 valve core elastic resetting piece, 35 valve core sealing ring, 36 valve body sealing ring;

40 filter elements, 401 pre-positioned filter elements, 402 main filter elements, 403 post-positioned filter elements, 4011/4021 cylinder bodies, 4012 filter materials, 4022 membrane components, 4013/4023 filter covers, 4014/4024 decorative covers, 4015/4025 handles, 4016/4026 upper end covers, 4017/4027 lower end covers, 4028 central tubes, 41 filter element sealing rings and 42 cover plates;

51 water inlet electromagnetic valve, 52 booster pump, 53 first one-way valve, 54 flushing electromagnetic valve, 55 pressure switch, 56 second one-way valve, 57 return electromagnetic valve;

61, 62 front covers, 63 front shells, 64 support the glue feet.

Detailed Description

The following describes in detail the embodiments of the present invention with reference to the drawings and examples. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.

It should be noted that, in the following description, terms such as "outer" and "inner" refer to terms of directions in which the components are normally oriented, for example, a part through which water flows is inner, and a part opposite to the part is outer. It is used merely for convenience in describing the invention and to simplify the description and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, and thus, features defining "first," "second," or the like, may explicitly or implicitly include one or more of such features.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the term "connected" should be construed broadly, and for example, it may be a fixed connection, a removable connection, or an integral connection; either directly or indirectly via an intermediate medium, or in communication with each other or in interaction with each other. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

As shown in fig. 1-77, as an embodiment of the filter cartridge of the present invention, the filter cartridge 40 is mounted on a waterway plate, at least one cartridge inlet connection port 13 and at least one cartridge outlet connection port 14 are provided on the waterway plate, check valves are respectively provided in the inlet and outlet ports of the filter cartridge 40, and as shown in fig. 1-15, the check valves comprise a valve cartridge 33 and a cartridge elastic return member 34 for returning the valve cartridge 33, when the filter cartridge 40 is not mounted on the waterway plate, i.e., the valve cartridge 33 is not acted on by an external force, the elasticity of the cartridge elastic return member 34 causes the valve cartridge 33 to be in a sealing position to block the inlet and the outlet ports, thereby avoiding the residual water in the filter cartridge 40 from being discharged out of a polluted cabinet, and when the filter cartridge 40 is mounted on the waterway plate, i.e., the valve cartridge 33 is acted on an inward pushing force, the valve cartridge 33 is forced by the waterway plate to leave a sealing position to communicate the inlet and the inlet connection port 13, the outlet port and the filter cartridge outlet connection port 14.

Preferably, seal engaging structures 311 for engaging with the valve element 33 are provided at the seal positions of the valve element 33 in the water inlet and the water outlet of the filter element 40, and the seal engaging structures 311 may be a retainer ring portion or tapered inner wall surfaces of the water inlet and the water outlet of the filter element 40.

In order to ensure sealing performance, the valve core 33 is provided with a valve core sealing ring 35 positioned on the circumferential direction of the valve core, so that water seepage of the water inlet and the water outlet of the filter core 40 in a blocking state is prevented.

In order to facilitate the installation of the check valve and the cooperation with the waterway plate, the check valve further comprises a valve body 31 and a valve cover 32, and the valve core 33 and the valve core elastic reset piece 34 are positioned in a space enclosed by the valve body 31 and the valve cover 32. Therefore, the whole check valve is integrated before being installed in the water inlet and the water outlet of the filter element 40, the check valve is convenient to install, the original structure of the filter element 40 does not need to be changed, the production cost can be reduced, and the check valve is wide in application range. Preferably, the valve body 31 is extended by the valve body 33 when not being acted upon by an external force, so that the valve body 33 can be acted upon by the external force first when the cartridge 40 is installed. In order to realize the sealing between the valve body 31 and the water inlet and the water outlet of the filter element 40, a valve body sealing ring 36 is arranged on the outer wall of the valve body 31, and the elastic action of the valve body sealing ring 36 seals the valve body 31 to prevent water in the filter element 40 from overflowing out of the filter element 40 from the valve body 31 so as to seal the gap between the water inlet and the water outlet.

On the basis of the above technical scheme, the inner walls of the water inlet and the water outlet of the filter element 40 are provided with the filter element sealing ring 41 for installing and sealing the filter element 40, the water inlet and the water outlet are provided with the cover plate 42 for preventing the filter element sealing ring 41 from being separated from the water inlet and the water outlet, and when the filter element water inlet connection port 13 and the filter element water outlet connection port 14 of the waterway plate are inserted into the water inlet and the water outlet of the filter element 40, the filter element sealing ring 41 can seal the gap between the filter element water inlet connection port 13 and the filter element water outlet connection port 14 and the water inlet and the water outlet of the filter element 40, so that the filter element 40 and the waterway plate can prevent water from overflowing during working.

In a second aspect the present invention provides a water purification system comprising at least one filter cartridge 40 as described above.

Preferably, as shown in fig. 78 to 79, the cartridge inlet connection port 13 and the cartridge outlet connection port 14 can be inserted into the water inlet and the water outlet of the cartridge 40, respectively. Of course, the water inlet and the water outlet of the filter element 40 may be inserted into the filter element water inlet connection port 13 and the filter element water outlet connection port 14, respectively. In addition, the filter element water inlet connection port 13 and the filter element water outlet connection port 14 can be communicated with the water inlet and the water outlet of the filter element 40 through hard pipelines.

When only one filter element 40 is connected to the waterway plate, the water is filtered by the filter element 40 and then directly discharged. When a plurality of filter elements 40 are connected to the waterway plate, a proper waterway can be provided as needed to obtain water of different qualities. For example, as a preferred embodiment of the present invention, as shown in fig. 80, the plurality of filter cartridges 40 are a pre-filter cartridge 401, a main filter cartridge 402 and a post-filter cartridge 403 which are sequentially connected, a water inlet solenoid valve 51 and a booster pump 52 are connected to a water path between the pre-filter cartridge 401 and the main filter cartridge 402, a first check valve 53 is connected to a water path between the main filter cartridge 402 and the post-filter cartridge 403, and a waste water port of the main filter cartridge 402 is connected to a waste water pipe orifice 121 of a water purification system. In this embodiment, the water outlet of the water purification system includes a first water outlet 122 and a second water outlet 123, the first water outlet 122 is connected to the water path between the booster pump 52 and the main filter element 402, and the second water outlet 123 is in communication with the water outlet of the post-filter element 403. That is, the inlet water is filtered by the pre-filter element 401 and then discharged from the first water outlet pipe orifice 122 to obtain common domestic water, and the inlet water is filtered by the pre-filter element 401, the main filter element 402 and the post-filter element 403 in sequence and then discharged from the second water outlet pipe orifice 123 to obtain purified water. The main filter cartridge 402 may employ a reverse osmosis membrane cartridge or an ultrafiltration membrane cartridge.

In order to ensure the cleanliness of the main filter element 402, a flushing electromagnetic valve 54 is connected to the water path section between the main filter element 402 and the wastewater pipe orifice 121, so as to regularly back flush the main filter element 402, prolong the service life of the main filter element 402, and a pressure switch 55 is connected to the water path section between the post filter element 403 and the second water outlet pipe orifice 123, so as to regulate the water outlet pressure.

Further, the water outlet section of the post-filter element 403 is communicated with the water outlet section of the water inlet electromagnetic valve 51 through a return water path, and the return water path is provided with a second check valve 56 and a return electromagnetic valve 57. When the second water outlet pipe 123 is not used for a long time, the return electromagnetic valve 57 can be started to re-filter the aged water at the second water outlet pipe 123 to obtain new water, so as to avoid bacteria which are stored and bred for a long time from contacting users.

Specifically, as shown in fig. 16-46, the main filter element 402 includes a barrel 4021, and a membrane assembly 4022 located in the barrel 4021, where a water inlet, a water outlet and a waste water port are provided at a water receiving end of the main filter element 402 on the barrel 4021, a check valve and a filter element sealing ring 41 are respectively provided in the water inlet, the water outlet and the waste water port, and a three-hole cover plate 42 is further provided at the water inlet, the water outlet and the waste water port, and the three-hole cover plate 42 can enable the filter element sealing ring 41 to be reliably accommodated in the water inlet, the water outlet and the waste water port of the main filter element 402. A filter cover 4023 and a decorative cover 4024 are connected to the main filter element 402 of the cartridge body 4021 at the non-water receiving end. A handle 4025 is hinged to the non-water-receiving end portion of the main filter element 402, so that the handle 4025 can rotate between a retracted position and a pulled position, wherein pulling force parallel to the axial direction of the main filter element 402 can be applied to the handle 4025 at the pulled position, and an inclined plane is arranged on the handle 4025. The handle 4025 is preferably hinged on the decorative cover 4024, the end face of the decorative cover 4024 is preferably in a step shape, and when the handle 4025 is in a retracted position, the main body can be abutted to the lower step of the decorative cover 4024, so that space is saved, and attractiveness is improved. The end surface of the filter cover 4023 is also preferably stepped. The membrane assembly 4022 of the main filter cartridge 402 includes a filter membrane, a center tube 4028 located within the filter membrane, an upper end cap 4026 and a lower end cap 4027 located at both ends of the filter membrane.

The structure of the front filter element 401 is the same as that of the rear filter element, as shown in fig. 47-77, the front filter element 401 comprises a cylinder 4011 and a filter material component 4012 positioned in the cylinder 4011, a water inlet and a water outlet are arranged at the water receiving end part of the front filter element 401 on the cylinder 4011, a check valve and a filter element sealing ring 41 are respectively arranged in the water inlet and the water outlet, a two-hole cover plate 42 is further arranged at the water inlet and the water outlet, and the two-hole cover plate 42 can enable the filter element sealing ring 41 to be reliably accommodated in the water inlet and the water outlet of the front filter element 401. A filter cover 4013 and a decorative cover 4014 are connected to the non-water-receiving end portion of the front filter element 401 on the cylinder 4011. A handle 4015 is hinged to the non-water receiving end portion of the pre-filter element 401, so that the handle 4015 can rotate between a retracted position and a pulled position, wherein the handle 4015 can be pulled in a pulling direction parallel to the axial direction of the pre-filter element 401, and an inclined surface is arranged on the handle 4015. The handle 4015 is preferably hinged on the decorative cover 4014, the end face of the decorative cover 4014 is preferably in a step shape, and when the handle 4015 is in a retracted position, the main body can be abutted to the lower step of the decorative cover 4014, so that space is saved, and attractiveness is improved. The end surface of the filter cap 4013 is also preferably stepped. The filter assembly 4012 of the pre-filter 401 comprises a filter, an upper end cap 4016 and a lower end cap 4017 at both ends of the filter.

To facilitate replacement of the cartridges 40, each cartridge 40 is preferably disposed horizontally. Based on the requirement of working capacity, the volume of the main filter element 402 is generally larger than that of the pre-filter element 401 and the post-filter element 403, and the vacant space after the filter element 40 is arranged can be used for arranging the booster pump 52, so that the whole structure of the water purifying system is compact, and the volume of the water purifying system is reduced.

The third aspect of the invention provides a water purifier, which comprises the water purifying system. As shown in fig. 81-84, the casing of the water purifier includes a housing 61 and a front cover 62 detachable from the housing 61, the water purifying system is disposed in the housing, and the non-water receiving end of the filter element is further provided with a front shell 63, so that each filter element 40 is stable, and the bottom of the housing 61 is provided with a supporting rubber foot 64, so as to avoid direct grounding of the housing 61.

From the above description, it can be seen that the present invention has the following advantages: the filter element is provided with the check valve, when the valve element 33 is not acted by external force, the valve element elastic reset piece 34 of the check valve has elasticity, so that the valve element 33 is in a sealing position to seal the water inlet and the water outlet, the residual water in the filter element 40 is prevented from being discharged out of a pollution cabinet, and when the valve element is subjected to inward thrust, the valve element 33 is separated from the sealing position to be communicated with the water inlet and the water outlet. In the preferred scheme of the invention, the valve core 33 and the valve core elastic resetting piece 34 thereof are arranged in the space surrounded by the valve body 31 and the valve cover 32, so that the whole check valve is integrated before being installed in the water inlet and the water outlet of the filter core 40, the installation of the check valve is convenient, the original structure of the filter core 40 does not need to be changed, the production cost can be reduced, and the application range of the check valve is wide.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.

In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.

Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.

Claims

1. The filter element is characterized in that a water inlet and a water outlet of the filter element (40) are respectively provided with a check valve, the check valve comprises a valve element (33), a valve element elastic reset piece (34) for resetting the valve element (33), a valve body (31) and a valve cover (32), and the valve element (33) and the valve element elastic reset piece (34) are positioned in a space enclosed by the valve body (31) and the valve cover (32); when the valve core (33) is not subjected to external force, the valve core elastic reset piece (34) is elastic, so that the valve core (33) is in a sealing position to seal the water inlet and the water outlet, one end of the valve core (33) facing away from the valve cover (32) extends out of the valve body (31), and when one end of the valve core (33) facing away from the valve cover (32) is subjected to inward thrust, the valve core (33) leaves the sealing position to be communicated with the water inlet and the water outlet.

2. The filter cartridge of claim 1, wherein the sealing position of the valve cartridge (33) in the water inlet and the water outlet of the filter cartridge (40) is provided with a sealing engagement structure (311) of the valve cartridge (33).

3. A cartridge as claimed in claim 1, wherein the cartridge (33) is provided with a cartridge seal (35) located circumferentially thereof.

4. The filter cartridge according to claim 1, characterized in that a valve body sealing ring (36) is provided on the outer wall of the valve body (31) to achieve a seal between the valve body (31) and the water inlet and the water outlet of the filter cartridge (40).

5. A filter cartridge according to any one of claims 1 to 4, characterized in that a cartridge sealing ring (41) for mounting and sealing the filter cartridge (40) is provided on the inner walls of the water inlet and the water outlet, and a cover plate (42) for preventing the cartridge sealing ring (41) from coming out of the water inlet and the water outlet is provided outside the water inlet and the water outlet.

6. A water purification system, characterized by comprising at least one filter cartridge (40) according to any one of claims 1 to 5.

7. The water purification system according to claim 6, wherein the filter element (40) comprises a pre-filter element (401), a main filter element (402) and a post-filter element (403) which are sequentially connected, a water inlet electromagnetic valve (51) and a booster pump (52) are connected on a water path section between the pre-filter element (401) and the main filter element (402), a first one-way valve (53) is connected on a water path section between the main filter element (402) and the post-filter element (403), and a waste water port of the main filter element (402) is connected with a waste water pipe orifice (121) of the water purification system.

8. The water purification system of claim 7, wherein the water outlet of the water purification system comprises a first outlet (122) and a second outlet (123), the first outlet (122) being connected to the water path between the booster pump (52) and the main filter cartridge (402), the second outlet (123) being in communication with the water outlet of the post-cartridge (403).

9. The water purification system according to claim 8, wherein a flushing solenoid valve (54) is connected to a water path section between the main filter cartridge (402) and the waste water nozzle (121), and a pressure switch (55) is connected to a water path section between the post-filter cartridge (403) and the second water outlet nozzle (123).

10. The water purification system according to claim 7, wherein the water outlet section of the post-filter element (403) is communicated with the water outlet section of the water inlet solenoid valve (51) through a return water path, and the return water path is provided with a second check valve (56) and a return solenoid valve (57).

11. A water purifier comprising a water purification system according to any one of claims 6 to 10.