CN113929160A

CN113929160A - Filter core, water purification system and purifier

Info

Publication number: CN113929160A
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: 2022-01-14
Anticipated expiration: 2040-06-29
Also published as: CN113929160B

Abstract

The invention provides a filter element, a water purification system and a water purifier, wherein a check valve is respectively arranged in a water inlet and a water outlet of the filter element (40), the check valve comprises a valve core (33) and a valve core elastic resetting piece (34) for resetting the valve core (33), when the valve core (33) is not subjected to external force, the valve core (33) is in a sealing position to block the water inlet and the water outlet due to the elasticity of the valve core elastic resetting piece (34), and when the valve core (33) is subjected to inward thrust, the valve core (33) leaves the sealing position to communicate the water inlet and the water outlet. The filter element can automatically block the water inlet and the water outlet when being replaced, and the phenomenon that residual water in the filter element is discharged to pollute a cabinet is avoided.

Description

Filter core, water purification system and 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 purification system and a water purifier comprising the filter element.

Background

The water purifier uses tap water as the inflow, filters through different filter cores, can obtain the drinking water. The drinking water of the water purifier reaches the level of pure water and can be directly drunk. Domestic water of a water purifier on the market is generally filtered by various filter elements, such as a PP cotton filter element, an activated carbon filter element, an ultrafiltration membrane filter element, a reverse osmosis membrane filter element or a composite filter element 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. Like the cotton filter core of PP, it plays the effect of filtering large granule impurity such as silt, colloid, after having used a period, because the filter core is inside has gathered a large amount of silt, extremely influences its filter effect, reduces the availability factor of filter core at the back, so must in time change. The replacement period recommended by the manufacturer is 6 to 12 months, and in some regions with poor water quality, the filter element needs to be replaced within 3 months. 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 going to the door, and the after-sales personnel also need to go to the door for replacement when the filter element is replaced. As shown in fig. 85: the front three-stage filtration of the water purifier consists of a filter flask cover 1 ', a filter flask 2 ' and a filter element 3 ', the filter flask 2 ' and the filter flask cover 1 ' are connected through threads, when the filter element is replaced, the filter flask 2 ' can be disassembled and screwed by using a special spanner, the old filter element 3 ' is taken out, a new filter element 3 ' is put in, and the filter flask 2 ' is screwed by using the special spanner. When the filter bottle 2 'is unscrewed, the residual water in the filter bottle 2' is easy to spill, which causes troubles to users.

Disclosure of Invention

The technical problem to be solved by the first aspect of the present invention is to provide a filter element, which can prevent the residual water from being discharged when the filter element is replaced, and keep the cabinet clean.

The technical problem to be solved by the second aspect of the present invention is to provide a water purification system, which can prevent the residual water from being discharged when the filter element of the water purification system is replaced, and keep the cabinet clean.

The third aspect of the invention is to provide a water purifier, wherein the filter element of the water purifier can prevent residual water from being discharged during replacement, so that 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 core and a valve core elastic reset member for resetting the valve core, when the valve core is not subjected to an external force, the valve core is in a sealing position by the elasticity of the valve core elastic reset member to block the water inlet and the water outlet, and when the valve core is subjected to an inward thrust, the valve core leaves the sealing position to communicate the water inlet and the water outlet.

Preferably, the sealing position of the valve core in the water inlet and the water outlet of the filter element is provided with a sealing matching structure of the valve core.

Preferably, a valve core sealing ring is arranged on the valve core in the circumferential direction of the valve core.

Furthermore, the check valve further comprises a valve body and a valve cover, and the valve core and the elastic resetting piece of the valve core are positioned in a space enclosed 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, the inner walls of the water inlet and the water outlet are provided with filter element sealing rings for installing and sealing the filter elements, and the water inlet and the water outlet are externally provided with cover plates for preventing the filter element sealing rings from being separated from the water inlet and the water outlet.

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

Preferably, the filter core is including leading filter core, main filter core and the rearmounted filter core that connects gradually, leading filter core with be connected with into water 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 rearmounted filter core, the waste water mouth of main filter core with water purification system's waste water pipe mouth is connected.

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

Furthermore, a flushing electromagnetic valve is connected to a water section between the main filtering filter element and the waste water pipe opening, and a pressure switch is connected to a water section between the post-positioned filter element and the second water outlet pipe opening.

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 water path, and a second one-way valve and a backflow electromagnetic valve are arranged on the backflow water path.

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 check valves are arranged in the water inlet and the water outlet of the filter element, when the filter element is not subjected to external force, the valve core of the check valve is in a sealing position due to the elasticity of the elastic resetting piece of the valve core to block the water inlet and the water outlet, so that residual water in the filter element is prevented from being discharged to pollute a cabinet, and when the valve core is subjected to inward thrust, the valve core leaves the sealing position to communicate 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 enclosed by the valve body and the valve cover, so that the whole check valve forms a whole before being arranged 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 does not need 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 valve core 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 check valve body 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 construction of the 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 main filter cartridge of the present invention;

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

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

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

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

fig. 24 is an exploded view of a membrane module of a main filtration cartridge of the present invention;

FIG. 25 is a schematic view of the construction 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 a 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 main filtration 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 main filtration 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 a 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 a front or rear cartridge according to the present invention;

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

FIG. 49 is an exploded view of a front or rear cartridge of the present invention;

FIG. 50 is a schematic view of the construction of the cartridge body of the front or rear 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 the present invention with a front or rear filter element;

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

FIG. 55 is an exploded view of a filter assembly of the present invention with a front or rear filter element;

FIG. 56 is a schematic view of a filter cover of a front or rear filter cartridge according to 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 a decorative cover for a front or rear cartridge according to 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 front or rear 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 construction of the upper end cap of the filter of the leading or trailing 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 construction of the lower end cap of the filter of the present invention for the front or rear filter cartridge;

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 construction of a cover plate for a front or rear cartridge according to 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 front or rear cartridge of the present invention;

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

FIG. 77 is a partially exploded view of FIG. 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 of FIG. 78;

FIG. 80 is a schematic diagram of a water path of one embodiment of the water purification system of the present invention;

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

FIG. 82 is a schematic view of a water purifier according to the present invention with its front cover opened;

FIG. 83 is a schematic view of the water purification system of the water purifier of the present invention detached from the housing;

FIG. 84 is a schematic view of the water purification system of FIG. 83 with the filter element and the water pathway omitted;

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

Description of the invention

A 121 waste water pipe orifice, a 122 first water outlet pipe orifice, a 123 second water outlet pipe orifice, a 13 filter element water inlet connecting port and a 14 filter element water outlet connecting port;

21 central rod, 211 central rod shoulder, 22 elastic reset piece, 23 sealing ring, 24 sealing piece;

31, 311, a sealing matching structure, 32 valve covers, 33 valve cores, 34 valve core elastic reset pieces, 35 valve core sealing rings and 36 valve body sealing rings;

40 filter elements, 401 front filter elements, 402 main filter elements, 403 rear filter elements, 4011/4021 barrels, 4012 filter materials, 4022 membrane assemblies, 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;

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

the shell 61, the front cover 62, the front shell 63 and the rubber foot 64 are supported.

Detailed Description

The following detailed description of specific embodiments of the present invention is provided in connection with the accompanying drawings and examples. It should be understood that the detailed description and specific examples, while indicating the present invention, are intended for purposes of illustration and explanation only and are not intended to limit the scope of the invention.

It should be noted that, in the following description, for clarity of explanation of the technical solutions of the present invention, directional terms such as "outer", "inner", and the like have meanings according to the normal directions of the components, for example, a portion through which water flows is inner, and a portion opposite to the inner portion is outer. This is done solely for the purpose of facilitating the description of the invention and simplifying the description without indicating or implying that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation and therefore should not be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" 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 therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features described.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the term "connected" is to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; either directly or indirectly through intervening media, either internally or in any combination thereof. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1-77, as an embodiment of the filter cartridge of the present invention, the filter cartridge 40 is installed on a water channel plate, the water channel plate is provided with at least one filter cartridge water inlet connection port 13 and at least one filter cartridge water outlet connection port 14, and the water inlet and the water outlet of the filter cartridge 40 are respectively provided with a check valve, as shown in fig. 1-15, the check valve comprises a valve core 33 and a valve core elastic reset piece 34 for resetting the valve core 33, when the filter cartridge 40 is not installed on the water channel plate, that is, the valve core 33 is not subjected to an external force, the elasticity of the valve core elastic reset piece 34 enables the valve core 33 to be in a sealing position to block the water inlet and the water outlet, so as to prevent residual water in the filter cartridge 40 from being discharged to pollute a cabinet, and when the filter cartridge 40 is installed on the water channel plate, that is, the valve core 33 is subjected to an inward pushing force, the water channel plate is forced to leave the sealing position to communicate the water inlet and the filter cartridge water inlet Water connector 13, outlet port and filter core outlet connection mouth 14.

Preferably, a sealing and matching structure 311 for matching with the valve core 33 is arranged at the sealing position of the valve core 33 in the water inlet and the water outlet of the filter element 40, and the sealing and matching structure 311 may be a limiting ring portion or a conical inner wall surface of the water inlet and the water outlet of the filter element 40.

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

In order to facilitate installation of the check valve and matching with the water passage 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 located in a space enclosed by the valve body 31 and the valve cover 32. Make whole check valve just form a whole before installing in the water inlet of filter core 40 and the delivery port like this, the installation of the check valve of not only being convenient for to filter core 40 structure originally need not change, but also reduction in production cost, and check valve application scope is wide. Preferably, when not subjected to external forces, the valve core 33 extends out of the valve body 31, so that when the filter cartridge 40 is installed, the valve core 33 can be subjected to external forces first. 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 gap between the valve body 31 and the water inlet and the water outlet so as to prevent the water in the filter element 40 from overflowing out of the filter element 40 from the valve body 31.

On the basis of above-mentioned technical scheme, the water inlet of filter core 40 with be equipped with on the inner wall of delivery port and be used for the sealed filter core sealing washer 41 of filter core 40 installation, the water inlet with the delivery port is equipped with outward and is used for preventing filter core sealing washer 41 deviates from the mouth of a river with the apron 42 of delivery port, when the filter core of water route board is intake connector 13 and filter core water outlet connector 14 and is inserted the intake and the delivery port of filter core 40, filter core sealing washer 41 can plug filter core intake connector 13 and filter core water outlet and even the water inlet of interface 14 and filter core 40 and the clearance between the delivery port, prevents that filter core 40 and water route board have water to spill over at the during operation.

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

Preferably, as shown in fig. 78-79, the cartridge inlet connection port 13 and the cartridge outlet connection port 14 are insertable into the inlet and outlet, respectively, of the cartridge 40. However, the water inlet and the water outlet of the filter element 40 can 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 connecting port 13 and the filter element water outlet connecting port 14 are 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 water circuit board, the inlet water is directly discharged after being filtered by the filter element 40. When a plurality of filter elements 40 are connected to the water channel plate, a proper water channel can be arranged as required to obtain water with different water qualities. For example, as shown in fig. 80, a plurality of filter elements 40 are a front filter element 401, a main filter element 402 and a rear filter element 403 which are connected in sequence, a water inlet solenoid valve 51 and a booster pump 52 are connected to a water path between the front filter element 401 and the main filter element 402, a first check valve 53 is connected to a water path between the main filter element 402 and the rear filter element 403, and a waste water port of the main filter element 402 is connected to a waste water port 121 of a water purification system. In this embodiment, the water outlet nozzle of the water purification system includes a first water outlet nozzle 122 and a second water outlet nozzle 123, the first water outlet nozzle 122 is connected to the water path between the booster pump 52 and the main filter element 402, and the second water outlet nozzle 123 is communicated with the water outlet of the rear filter element 403. That is, the inlet water is filtered by the front filter element 401 and then discharged from the first water outlet 122 to obtain the common domestic water, and the inlet water is filtered by the front filter element 401, the main filter element 402 and the rear filter element 403 in sequence and then discharged from the second water outlet 123 to obtain the purified water. The main filtration cartridge 402 may be a reverse osmosis membrane cartridge or an ultrafiltration membrane cartridge.

In order to ensure the cleanness of the main filter element 402, a flushing solenoid valve 54 is connected to a water path between the main filter element 402 and the waste water pipe port 121 to periodically perform back flushing on the main filter element 402, so as to prolong the service life of the main filter element 402, and a pressure switch 55 is connected to a water path between the post-filter element 403 and the second water outlet pipe port 123 to adjust the outlet water pressure.

Furthermore, 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 backflow water path, and the backflow water path is provided with a second one-way valve 56 and a backflow solenoid valve 57. When the second water outlet pipe port 123 is not activated for a long time, the return electromagnetic valve 57 may be activated to re-filter the old water at the second water outlet pipe port 123 to obtain new water, so as to prevent the bacteria breeding after being placed for a long time from contacting the user.

Specifically, as shown in fig. 16 to 46, the main filter element 402 includes a barrel 4021 and a membrane module 4022 located in the barrel 4021, 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, 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 enables the filter element sealing ring 41 to be reliably received in the water inlet, the water outlet and the waste water port of the main filter element 402. The non-water-receiving end of the main filter element 402 on the barrel 4021 is connected with a filter cover 4023 and a decorative cover 4024. A handle 4025 is hinged to a non-water-receiving end portion of the main filter element 402, so that the handle 4025 can rotate between a retracted position and a drawn position, wherein the handle 4025 can be applied with a drawing force parallel to an axial direction of the main filter element 402 in the drawn position, and a slope is provided on the handle 4025. The handle 4025 is preferably hinged to the decorative cover 4024, the end face of the decorative cover 4024 is preferably designed to be stepped, and the main body of the handle 4025 can be attached to the lower step of the decorative cover 4024 in the retracted position, so that the space is saved, and the appearance is improved. Also the end face of the filter cover 4023 is preferably stepped. The membrane module 4022 of the main filtration cartridge 402 comprises a filtration membrane, a center tube 4028 located within the filtration membrane, and upper and

lower end caps

4026 and 4027 located at both ends of the filtration membrane.

Leading filter core 401 is the same with rearmounted filter core structure, as shown in fig. 47-77, leading filter core 401 includes barrel 4011, be located filter media assembly 4012 in barrel 4011, the water receiving tip position of leading filter core 401 on barrel 4011 is equipped with water inlet and delivery port, be equipped with check valve and filter core sealing washer 41 in its water inlet and the delivery port respectively, its water inlet and delivery port department still are equipped with a two hole apron 42, this two hole apron 42 can make filter core sealing washer 41 can hold reliably in the water inlet and the delivery port of leading filter core 401. The non-water-receiving end of the front filter element 401 on the cylinder body 4011 is connected with a filter cover 4013 and a decorative cover 4014. The non-water-receiving end part of the front filter element 401 is hinged with a handle 4015, so that the handle 4015 can rotate between a folding position and a drawing position, wherein the handle 4015 can be applied with drawing force parallel to the axial direction of the front filter element 401 at the drawing position, and an inclined plane is arranged on the handle 4015. Handle 4015 preferably articulates on decorating cover 4014, decorating cover 4014's terminal surface is preferably established to the echelonment, and handle 4015 main part can paste the lower floor step of decorating cover 4014 when the stowing position, not only saves space, has still promoted pleasing to the eye degree. Also the end face of the filter cover 4013 is preferably stepped. The filter assembly 4012 of the pre-filter cartridge 401 comprises a filter material, an upper end cap 4016 and a lower end cap 4017 at both ends of the filter material.

To facilitate replacement of cartridges 40, each cartridge 40 is preferably horizontally disposed. Based on the requirement of working capacity, the volume of the main filter element 402 is generally larger than that of the front filter element 401 and the rear filter element 403, and the booster pump 52 can be arranged in the vacant space after the filter elements 40 are arranged, so that the whole structure of the water purification system is compact, and the volume of the water purification system is reduced.

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 casing 61 and a front cover 62 detachable from the casing 61, the water purifying system is disposed in the casing, the non-water-receiving end of the filter element is further provided with a front casing 63, so that each filter element 40 is stable, and the bottom of the casing 61 is provided with a support rubber foot 64, so as to prevent the casing 61 from directly landing on the ground.

As can be seen from the above description, the present invention has the following advantages: the filter element is provided with the check valve, when the valve core 33 is not acted by external force, the valve core 33 is in a sealing position to block the water inlet and the water outlet due to the elasticity of the valve core elastic reset piece 34 of the check valve, so that the cabinet is prevented from being polluted by residual water in the filter element 40, and when the valve core is pushed inwards, the valve core 33 leaves the sealing position to communicate the water inlet and the water outlet. In the preferred scheme of the invention, the valve core 33 and the elastic valve core resetting piece 34 are arranged in the space enclosed 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 element 40, the installation of the check valve is convenient, the original structure of the filter element 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 with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the scope of the technical idea of the present invention, and these simple modifications are within the scope of the present invention.

It should be noted that the technical features described in the above embodiments may be combined in any suitable manner without contradiction, and the present invention does not need to describe any combination of possible ways in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims

1. The filter element is characterized in that a check valve is arranged in a water inlet and a water outlet of the filter element (40) respectively, the check valve comprises a valve core (33) and a valve core elastic resetting piece (34) used for resetting the valve core (33), when the valve core (33) is free from external force, the valve core (33) is in a sealing position to block the water inlet and the water outlet due to the elasticity of the valve core elastic resetting piece (34), and when the valve core (33) is subjected to inward thrust, the valve core (33) leaves the sealing position to communicate the water inlet and the water outlet.

2. The filter cartridge according to claim 1, wherein the sealing position of the valve element (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 element (33).

3. The filter cartridge according to claim 1, characterized in that the valve insert (33) is provided with a valve insert sealing ring (35) on its circumference.

4. The filter cartridge according to claim 1, wherein the check valve further comprises a valve body (31) and a valve cover (32), and the valve core (33) and the valve core elastic resetting piece (34) are positioned in a space enclosed by the valve body (31) and the valve cover (32).

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

6. The filter cartridge according to any one of claims 1 to 5, wherein the inner walls of the water inlet and the water outlet are provided with filter cartridge sealing rings (41) for installing and sealing the filter cartridge (40), and the outside of the water inlet and the water outlet is provided with a cover plate (42) for preventing the filter cartridge sealing rings (41) from falling out of the water outlet and the water outlet.

7. A water purification system, characterized in that it comprises at least one filter cartridge (40) according to any one of claims 1 to 6.

8. The water purification system of claim 7, wherein the filter element (40) comprises a front filter element (401), a main filter element (402) and a rear filter element (403) which are connected in sequence, a water inlet electromagnetic valve (51) and a booster pump (52) are connected to a water section between the front filter element (401) and the main filter element (402), a first check valve (53) is connected to a water section between the main filter element (402) and the rear filter element (403), and a waste water port of the main filter element (402) is connected with a waste water port (121) of the water purification system.

9. The water purification system of claim 8, wherein the water outlet ports of the water purification system comprise a first water outlet port (122) and a second water outlet port (123), the first water outlet port (122) is connected to a water path between the booster pump (52) and the main filter cartridge (402), and the second water outlet port (123) is communicated with the water outlet of the post-filter cartridge (403).

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

11. The water purification system of claim 8, 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).

12. A water purification machine comprising a water purification system according to any one of claims 7 to 11.