Filters and water purification devices

Abstract

The present invention discloses a filter element and a water purification device, which relates to the field of water treatment technology. The filter element comprises: a first filter element mechanism and a second filter element mechanism, the first filter element mechanism comprises a first housing and a first filter unit arranged in the first housing, and the inner side wall of the first housing forms a receiving cavity; the second filter element mechanism comprises a second housing and a second filter unit arranged in the second housing; the second filter element mechanism can be detachably installed in the receiving cavity of the first filter element mechanism; the first filter element mechanism has a first water inlet unit; the second filter element mechanism has a second water inlet unit; the first water inlet unit has a sixth port for outputting filtered water, the second water inlet unit has a fourth port for inputting filtered water, and the fourth port and the sixth port can be connected. The present application can realize the replacement of the entire filter element, the replacement of only the second filter element mechanism alone, and the replacement of only the first filter element mechanism alone, and can effectively improve the integration of the filter element and reduce the volume of the water purification device.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment, and in particular to a filter element and a water purification device. Background Art

[0002] In order to effectively improve the service life and water purification effect of the water purification device, the current water purification device includes a multi-stage filter element to filter the water in sequence. At present, the setting of the multi-stage filter element mechanism generally adopts two methods. The first method is that each filter element forms an independent filter element mechanism and is installed on the housing of the water purification device. Although this method can realize the replacement of any filter element mechanism, multiple independent filter element mechanisms will make the volume of the entire water purification device larger and the integration is not high enough. The second method is that 2 or more filter elements form a composite filter element. This method effectively reduces the volume of the water purification device and improves the integration. However, the user himself basically cannot directly replace only one filter element in the composite filter element. Because multiple filter elements form an integral load filter element during the processing and manufacturing process, when replacing, the entire composite filter element must be replaced, which causes the waste of other usable filter elements in the composite filter element. Therefore, a new filter element is urgently needed to solve the above problems. Summary of the invention

[0003] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a filter element and a water purification device, which can conveniently and quickly realize the replacement of the entire filter element, the replacement of only the second filter element mechanism alone, and the replacement of only the first filter element mechanism alone, and can effectively improve the integration of the filter element and reduce the volume of the water purification device.

[0004] The specific technical solution of the embodiment of the present invention is:

[0005] A filter element, the filter element comprising: a first filter element mechanism and a second filter element mechanism, the first filter element mechanism comprising a first housing and a first filter unit arranged in the first housing, the inner side wall of the first housing forming a receiving cavity extending in an axial direction; the second filter element mechanism comprising a second housing and a second filter unit arranged in the second housing; the second filter element mechanism can be detachably installed in the receiving cavity of the first filter element mechanism;

[0006] The first filter element mechanism has a first water inlet unit connected to the water purification device for conveying inlet and outlet water; the second filter element mechanism has a second water inlet unit connected to the water purification device for conveying inlet and outlet water; the first water inlet unit has at least one sixth port for filtered water output, and the second water inlet unit has at least one fourth port for filtered water input, and the fourth port and the sixth port can be connected.

[0007] Preferably, the first filter unit has a clean water outlet, and the sixth port is connected to the clean water outlet; the second filter unit includes a post-filter unit having a water inlet end, and the water inlet end is connected to the fourth port.

[0008] Preferably, the first filter element mechanism further comprises an isolating sleeve arranged in the inner side wall of the first shell, a first flow channel is formed between the isolating sleeve and the inner side wall, and the inner side wall has a through hole connected with the first flow channel.

[0009] Preferably, the first water inlet unit also includes a fifth port and a seventh port opened on the first shell; the outer wall of the first filter unit is a wastewater outlet, the inner wall of the first filter unit is a clean water outlet, and the end of the first filter unit is a raw water inlet; the raw water inlet is connected to the fifth port, the clean water outlet is connected to the sixth port through the through hole and the first flow channel, and the wastewater outlet is connected to the seventh port.

[0010] Preferably, the second filter unit also includes an outer shell arranged in the second shell, a central tube arranged in the outer shell, a pre-filter unit and the post-filter unit, and a second flow channel is formed between the outer shell and the second shell; the pre-filter unit is sleeved outside the central tube, and one end of the central tube is connected to the water outlet end of the post-filter unit; the pre-filter mechanism and the post-filter mechanism are arranged in a vertical direction.

[0011] Preferably, the second nozzle unit further comprises a first port and a second port opened on the second shell, and the outer shell has a third port;

[0012] There is an annular space between the outer wall of the pre-filter unit and the outer shell, the outer wall of the pre-filter unit is the inlet end, and the first port is connected to the annular space; the inner wall of the pre-filter mechanism is the outlet end, and the outlet end is connected to the second port; the fourth port is connected to the water inlet end of the post-filter unit through the second flow channel and the third port.

[0013] Preferably, the post-filtration unit comprises: a microfiltration filter element and activated carbon, and the incoming water first passes through the activated carbon and then passes through the microfiltration filter element.

[0014] Preferably, the pre-filter unit has an inlet end, and the post-filter unit has a water outlet end;

[0015] The second filter element mechanism further includes: a communication mechanism with one end connected to the inlet end and the other end connected to the water outlet end, and the communication mechanism can conduct from the water outlet end direction to the inlet end direction.

[0016] Preferably, the communication mechanism comprises a one-way valve, an inlet of the one-way valve is connected to the water outlet, and an outlet of the one-way valve is connected to the inlet.

[0017] Preferably, the shell includes a first shell for accommodating the pre-filter unit and a second shell for accommodating the post-filter unit, the upper end of the second shell is sealedly connected to the lower end of the first shell; the side wall of the second shell has a recess, the connecting mechanism is arranged in the recess, and the second shell is provided with a through hole connecting the recess and the water outlet.

[0018] Preferably, an annular space is provided between the outer side wall of the pre-filter unit and the outer shell; the first outer shell is sleeved outside the second outer shell, a gap is provided between the uppermost side wall of the second outer shell and the inner wall of the first outer shell, and the recess is connected to the annular space through the gap;

[0019] The middle part of the upper end of the second shell is provided with an opening connected with the water outlet end, and the central tube is inserted in the opening.

[0020] Preferably, the filter element further comprises a limiting mechanism, and when the second filter element mechanism is installed into the accommodating cavity of the first filter element mechanism, the limiting mechanism can keep the first filter element mechanism and the second filter element mechanism relatively fixed in the circumferential direction.

[0021] Preferably, the first nozzle unit and the second nozzle unit are located at the same end of the filter element.

[0022] Preferably, the filter element has a first end and a second end opposite to each other, the first filter element mechanism has a first operating part for installing the filter element on or removing it from the water purification device, and the first operating part is close to the first end of the filter element; the first water outlet unit and the second water outlet unit are located at the second end of the filter element.

[0023] Preferably, the first operating portion includes a first operating member installed on the end face of the first filter element mechanism close to the first end, and the first operating member has at least two states. In the first state, the first operating member abuts against the end face of the second filter element mechanism to limit the second filter element mechanism in the axial direction of the filter element so that the second filter element mechanism is fixed in the first filter element mechanism; in the second state, the first operating member is disengaged from the end face of the second filter element mechanism so that the second filter element mechanism can be taken out of the accommodating cavity.

[0024] Preferably, one end of the first operating member is connected to the end face of the first filter element mechanism in a hinged manner, the other end of the first operating member has a first clamping portion, and the end face of the first filter element mechanism close to the first end has a second clamping portion, and the first clamping portion can be engaged with the second clamping portion; when the first clamping portion is engaged with the second clamping portion, the first operating member has a projection on the end face of the second filter element mechanism along the axial direction of the filter element, so that the first operating member is in the first state.

[0025] Preferably, the cross section of the second filter element mechanism on the radial plane is circular, the cross section of the first filter element mechanism on the radial plane is annular, and the axis of the first filter element mechanism is the same as the axis of the second filter element mechanism.

[0026] Preferably, the cross section of the second filter element mechanism on a radial plane is circular, and the projection of the first operating portion on the end surface of the second filter element mechanism along the axial direction of the filter element covers at least one diameter of the second filter element mechanism.

[0027] Preferably, the filter element has a first end and a second end opposite to each other, and the second filter element mechanism has a second operating part for installing the second filter element mechanism into the accommodating cavity of the first filter element mechanism or removing it from the accommodating cavity of the first filter element mechanism; the second operating part is close to the first end of the filter element.

[0028] Preferably, the second operating part includes: a second operating member installed on the end face of the second filter element mechanism close to the first end, the second filter element mechanism has a recessed portion on the end face of the first end, and the second operating member can rotate around the diameter on the end face of the second filter element mechanism so that it can be embedded in the recessed portion or protrude from the end face of the second filter element mechanism.

[0029] Preferably, an end of the first filter element mechanism close to the second end has a first threaded portion.

[0030] Preferably, the first filtration unit is a reverse osmosis membrane filtration unit or a nanofiltration membrane filtration unit.

[0031] A water purification device comprises: a main housing, one end surface of which is provided with a downwardly recessed chamber; and a filter element as described in any one of the above, which can be arranged in the chamber.

[0032] Preferably, the first filter element mechanism has a first operating part for installing the filter element on or removing it from the water purification device, and the filter element and the main housing are switched between a locked state and an unlocked state by rotating the first operating part around the axis of the filter element.

[0033] Preferably, the first filter element mechanism has a first threaded portion at one end close to the second end, and the main housing has a second threaded portion matching the first threaded portion, and when the first operating member is rotated, the first threaded portion is screwed into or disengaged from the second threaded portion, so that the filter element and the main housing are switched between a locked state and an unlocked state.

[0034] Preferably, the water purification device also includes: a boosting device; an interface unit, when the filter element and the main housing are in a locked state, each interface in the interface unit is connected to the first water outlet unit of the first filter element mechanism and / or the second water outlet unit of the second filter element mechanism, so that the second port is connected to the inlet of the boosting device, the outlet of the boosting device is connected to the fifth port, and the sixth port is connected to the fourth port.

[0035] The technical solution of the present invention has the following significant beneficial effects:

[0036] The first filter element mechanism in the present application has a first shell. Since an accommodating cavity is formed on the inner wall of the first shell, the second filter element mechanism can be directly and detachably installed in the accommodating cavity of the first filter element mechanism without disassembling the first filter element mechanism; and the second filter element mechanism has an independent second shell. When installing or disassembling the second filter element mechanism, on the one hand, there will be no outflow of water retained in the filter element, thereby causing inconvenience to the user. On the other hand, the second filter element mechanism is completely independent and can be directly installed and disassembled without any operation on the first filter element mechanism. Moreover, there is no need to consider the sealing between the first filter element mechanism and the second filter element mechanism during the installation and disassembly process to avoid water leakage.

[0037] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Within the spirit and scope of the appended claims, the embodiments of the present invention include many changes, modifications and equivalents. Features described and / or shown for one embodiment can be used in one or more other embodiments in the same or similar manner, combined with features in other embodiments, or replace features in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0039] Figure 1 It is a schematic diagram of a second filter element mechanism in a filter element in an embodiment of the present invention being detachably installed in a receiving cavity of a first filter element mechanism;

[0040] Figure 2 It is a schematic diagram of the first filter element mechanism and the second filter element mechanism being relatively fixed by the limiting mechanism in the embodiment of the present invention;

[0041] Figure 3 A schematic diagram showing that the second filter element mechanism can be taken out from the accommodating cavity of the first filter element mechanism in an embodiment of the present invention;

[0042] Figure 4 It is a cross-sectional view of the filter element in the first embodiment of the present invention;

[0043] Figure 5 It is a cross-sectional view of the filter element in the second embodiment of the present invention;

[0044] Figure 6 This is a schematic diagram of installing a filter element in a water purification device in an embodiment of the present invention.

[0045] Reference numerals in the above drawings:

[0046] 1. First end; 2. Second end; 3. First filter element mechanism; 31. Accommodating chamber; 32. First operating part; 33. First water outlet unit; 331. Fifth port; 332. Sixth port; 333. Seventh port; 34. Second clamping part; 35. First shell; 351. Inner wall; 3511. Through hole; 352. Spacer sleeve; 353. First flow channel; 36. First threaded part; 37. First filter unit; 4. Second filter element mechanism; 41. Second operating part; 42. Second water outlet unit; 421. First port; 422. Second port; 423. First Four ports; 43, recessed portion; 44, second shell; 45, outer shell; 451, third port; 452, first outer shell; 453, second outer shell; 4531, recess; 46, central tube; 47, pre-filter unit; 471, supporting frame; 48, post-filter unit; 49, second flow channel; 410, connecting mechanism; 51, first limiting portion; 52, second limiting portion; 6, first operating member; 61, first clamping portion; 7, second operating member; 81, first annulus; 82, second annulus; 100, filter element; 200, main housing; 2001, chamber. DETAILED DESCRIPTION

[0047] The details of the present invention can be more clearly understood by combining the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be regarded as belonging to the scope of the present invention. It should be noted that when an element is referred to as "arranged on" another element, it can be directly on another element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the communication between the two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0049] In order to realize the replacement of the entire filter element 100 conveniently and quickly, replace only the second filter element mechanism 4 alone, replace only the first filter element mechanism 3 alone, and effectively improve the integration of the filter element 100 and reduce the volume of the water purification device, a filter element 100 is proposed in the present application. Figure 1 Schematic diagram of a second filter element mechanism in a filter element in an embodiment of the present invention being detachably installed in the accommodating cavity of the first filter element mechanism, Figure 2 FIG. 1 is a schematic diagram of a first filter element and a second filter element being relatively fixed by a limiting mechanism in an embodiment of the present invention. Figure 1 and Figure 2As shown, the filter element 100 may include: a first filter element mechanism 3 and a second filter element mechanism 4, the first filter element mechanism 3 includes a first shell 35 and a first filter unit 37 arranged in the first shell 35, and the inner wall 351 of the first shell 35 is formed with a accommodating cavity 31 extending in the axial direction; the second filter element mechanism 4 includes a second shell 44 and a second filter unit arranged in the second shell 44; the second filter element mechanism 4 can be detachably installed in the accommodating cavity 31 of the first filter element mechanism 3; the first filter element mechanism 3 has a first water inlet unit connected to a water purification device for conveying inlet and outlet water; the second filter element mechanism 4 has a second water inlet unit connected to a water purification device for conveying inlet and outlet water; the first water inlet unit has at least one sixth port 332 for outputting filtered water, and the second water inlet unit has at least one fourth port 423 for inputting filtered water, and the fourth port 423 and the sixth port 332 can be connected.

[0050] The first filter element mechanism 3 in the present application has a first shell 35. Since the inner side wall 351 of the first shell 35 is formed with a receiving cavity 31, the second filter element mechanism 4 can be directly and detachably installed in the receiving cavity 31 of the first filter element mechanism 3 without disassembling the first filter element mechanism 3; and the second filter element mechanism 4 has an independent second shell 44. The first filter element mechanism 3 has a first water inlet unit connected to a water purification device for conveying inlet and outlet water; the second filter element mechanism 4 has a second water inlet unit connected to the water purification device for conveying inlet and outlet water, and the first water inlet unit The sixth port 332 for outputting filtered water is connected to the fourth port 423 for inputting filtered water of the second water outlet unit through a water purification device. Therefore, when installing or removing the second filter element mechanism, on the one hand, there will be no outflow of water retained in the filter element 100, thereby causing inconvenience to the user. On the other hand, the second filter element mechanism 4 is completely independent and can be directly installed and removed without any operation on the first filter element mechanism 3. Moreover, during the installation and removal process, there is no need to consider the sealing between the first filter element mechanism 3 and the second filter element mechanism 4 to avoid water leakage.

[0051] The first filter element mechanism 3 and the second filter element mechanism 4 can be installed on a fixed waterway plate of the water purification device, and conduction between the fourth port 423 and the sixth port 332 is achieved through the fixed waterway plate; they can also be installed on a detachable mechanism installed on the water purification device, and conduction between the fourth port 423 and the sixth port 332 is achieved through the detachable mechanism.

[0052] In order to better understand the filter element 100 in the present application, further explanation and description will be given below. Figure 1 to Figure 2As shown, the filter element 100 has a first end 1 and a second end 2 facing each other, the first end 1 is an end facing upward, and the second end 2 is an end facing downward. The filter element 100 includes: a first filter element mechanism 3, a second filter element mechanism 4 and a limiting mechanism.

[0053] Among them, Figure 1 to Figure 2 As shown, the first filter element mechanism 3 includes a first housing 35 and a first filter unit 37 disposed in the first housing 35. The first housing 35 includes an inner side wall 351, an outer side wall, an upper end cover and a lower end cover. The inner side wall 351 of the first housing is formed with a receiving chamber 31 extending in the axial direction. The receiving chamber 31 may have an opening located at the end face of the first filter element mechanism 3 close to the first end 1, and the second filter element mechanism 4 may be installed in the receiving chamber 31 from one end of the first filter element mechanism 3 close to the first end 1. The opening of the receiving chamber 31 may also be located at the end face of the first filter element mechanism 3 close to the second end 2, and the second filter element mechanism 4 may be installed in the receiving chamber 31 from one end of the first filter element mechanism 3 close to the second end 2. Of course, the receiving chamber may also have openings at both the end face of the first filter element mechanism 3 close to the first end 1 and the end face close to the second end 2, and the second filter element mechanism 4 may be installed in the receiving chamber 31 from either end. Since the inner side wall 351 of the first housing 35 is formed with a receiving cavity 31, the second filter element 4 can be directly and detachably installed in the receiving cavity 31 of the first filter element 3 without disassembling the first filter element 3. The first filter unit 37 may include a filter element unit with a filtering function, or may include a plurality of filter units of different types.

[0054] like Figure 1 to Figure 2 As shown, the second filter element mechanism 4 includes a second housing 44 and a second filter unit arranged in the second housing 44. The second filter unit may include a filter element unit with a filtering function, or may include a plurality of filter units of different types. In one embodiment, the second housing 44 may have an outer side wall, an upper end cover and a lower end cover. The second filter element mechanism 4 can be detachably installed in the accommodating chamber 31 of the first filter element mechanism 3. When the second filter element mechanism 4 is installed in the first filter element mechanism 3, the outer side wall of the second housing 44 is opposite to the inner side wall of the first housing 35. When installing or removing the second filter element mechanism, on the one hand, there will be no outflow of water retained in the filter element 100, thereby causing inconvenience to the user, and on the other hand, the second filter element mechanism 4 is completely independent, and the second filter element mechanism 4 can be directly installed and removed without any operation on the first filter element mechanism 3, and the sealing between the first filter element mechanism 3 and the second filter element mechanism 4 does not need to be considered during the installation and removal process to avoid water leakage.

[0055] like Figure 1 and Figure 2As shown, the first filter element mechanism 3 has a first operating portion 32 on the end surface close to the first end 1 for installing the first filter element mechanism 3 on or removing it from the water purification device, and the first operating portion 32 can be located on the first housing 35. The first operating portion 32 can be for the user to hold or operate the first filter element mechanism 3, which can be the first operating member 6, or a shape formed on the first filter element mechanism 3 close to the first end 1 for the user to hold the first filter element mechanism 3 to operate it, such as a concave bayonet or a convex shape, etc.

[0056] like Figure 1 and Figure 2 As shown, the overall shape of the second filter element mechanism 4 matches the accommodating cavity 31. In a feasible embodiment, the second filter element mechanism 4 has a second operating portion 41 on the end surface close to the first end 1 for installing the second filter element mechanism 4 into the accommodating cavity 31 of the first filter element mechanism 3 or removing it from the accommodating cavity 31 of the first filter element mechanism 3, and the second operating portion 41 can be located on the second housing 44. The user can hold the second operating portion 41 so that the second filter element mechanism 4 can be easily pulled out from the accommodating cavity 31 of the first filter element mechanism 3 from the end close to the first end 1 to achieve the purpose of disassembly. The second operating portion 41 can be used for the user to operate the second filter element mechanism 4, which can be a second operating member 7, or a shape formed at a certain end of the second filter element mechanism 4 for the user to hold the second filter element mechanism 4 to operate it, such as a concave bayonet or a convex shape, etc. Preferably, the second operating portion 41 is located at one end of the second filter element mechanism 4 close to the first end 1, and in particular, can be located on the end surface, which will not affect the installation of the second filter element mechanism 4 into the accommodating cavity 31.

[0057] The second end 2 of the filter element 100 has a water inlet unit connected to the water purification device for conveying water in and out. In a feasible embodiment, the water inlet unit may include a first water inlet unit 33 arranged on the first filter element mechanism 3 and a second water inlet unit 42 arranged on the second filter element mechanism 4. The first water inlet unit 33 has at least one sixth port 332 for outputting filtered water, and the second water inlet unit 42 has at least one fourth port 423 for inputting filtered water, and the fourth port 423 and the sixth port 332 can be connected. The filtered water filtered in the first filter element mechanism 3 can pass through the sixth port 332 of the first water inlet unit 33 and then through the pipeline in the external water purification device to communicate with the sixth port 332 in the second water inlet unit 42 in the second filter element mechanism 4, so as to achieve the purpose of inputting into the second filter element mechanism 4. The first water inlet unit 33 and the second water inlet unit 42 can be located at the same end of the filter element 100. The first water inlet unit 33 can be opened on the first housing 35. The second water inlet unit 42 can be opened on the second housing 44. Figure 6 FIG. 1 is a schematic diagram of a filter element installed in a water purification device according to an embodiment of the present invention. Figure 6 As shown, in this way, after the second filter element mechanism 4 is located in the first filter element mechanism 3, the second end 2 of the entire filter element 100 can be directly installed into the chamber 2001 on the main housing 200 of the water purification device, and the first water outlet unit 33 and the second water outlet unit 42 of the second end 2 of the filter element 100 can be directly and conveniently connected to the water channel of the main housing 200 without affecting the disassembly or installation of the filter element 100.

[0058] like Figure 1 and Figure 2 As shown, when the second filter element mechanism 4 is installed in the accommodating cavity 31 of the first filter element mechanism 3, the limiting mechanism makes the first filter element mechanism 3 and the second filter element mechanism 4 remain relatively fixed in the circumferential direction, and the second filter element mechanism 4 and the first filter element mechanism 3 cannot rotate, so as to facilitate the one-to-one connection and communication between different ports of the entire water outlet unit and the water purification device. The limiting mechanism can have a variety of different implementations, and the limiting mechanism can include a second limiting portion 52 disposed on the second filter element mechanism 4, and a first limiting portion 51 disposed on the first filter element mechanism 3 and capable of cooperating with the second limiting portion 52; when the first limiting portion 51 is engaged with the second limiting portion 52, the first filter element mechanism 3 and the second filter element mechanism 4 remain relatively fixed in the circumferential direction. For example, the first limiting portion 51 may be a recessed portion provided on the inner side wall of the first filter element mechanism 3, and the second limiting portion 52 may be a raised portion provided on the outer side wall of the second filter element mechanism 4. When the raised portion is engaged with the recessed portion, the first filter element mechanism 3 and the second filter element mechanism 4 remain relatively fixed in the circumferential direction and cannot rotate. For another example, the limiting mechanism may include a first limiting portion 51 provided on the end face of the second filter element mechanism 4 close to the first end 1, which may be a raised rib extending in the diameter direction; and a second limiting portion 52 provided on the first operating member 6 of the first filter element mechanism 3 and matching with the first limiting portion 51, which may be recessed. When the first operating member 6 is in the first state, the first limiting portion 51 is aligned with the second limiting portion 52 so that the second filter element mechanism 4 is at a correct specific angle, so that the second water outlet unit 42 of the second filter element mechanism 4 can be connected to the water channel of the interface unit of the main housing 200 of the water purification device, and the first filter element mechanism 3 and the second filter element mechanism 4 can also be relatively fixed in the circumferential direction.

[0059] In a preferred embodiment, Figure 1 and Figure 2 As shown, the first operating portion 32 may include a first operating member 6 installed on the end surface of the first filter element mechanism 3 close to the first end 1, and the first operating member 6 has at least two states. In the first state, the first operating member 6 abuts against the end surface of the second filter element mechanism 4 to limit the second filter element mechanism 4 in the axial direction of the filter element 100 so that the second filter element mechanism 4 is fixed in the first filter element mechanism 3; Figure 3 FIG. 1 is a schematic diagram showing that the second filter element mechanism can be taken out from the accommodating cavity of the first filter element mechanism in an embodiment of the present invention. Figure 3 As shown, in the second state, the first operating member 6 is disengaged from the end surface of the second filter element mechanism 4 so that the second filter element mechanism 4 can be taken out from the accommodating chamber 31 .

[0060] Specifically, if Figures 1 to 3 As shown, one end of the first operating member 6 is connected to the end face of the first filter element 3 near the first end 1 in a hinged manner, and the other end of the first operating member 6 has a first clamping portion 61. The end face of the first filter element 3 near the first end 1 has a second clamping portion 34, and the first clamping portion 61 can be engaged with the second clamping portion 34. The first operating member 6 can be rotated by means of a hinge connection, so that the first operating member 6 can abut against the end face of the second filter element 4 in the first state, and the first operating member 6 can be separated from the end face of the second filter element 4 in the second state so that the second filter element 4 can be taken out of the accommodating chamber 31. When the first clamping portion 61 is engaged with the second clamping portion 34, the first operating member 6 is fixed, and the second filter element 4 can be limited so that the second filter element 4 is fixed in the first filter element 3. When the second filter element 4 needs to be taken out, it is only necessary to manually rotate the first operating member 6 so that the first clamping portion 61 is separated from the second clamping portion 34.

[0061] When the first clamping portion 61 is engaged with the second clamping portion 34, the first operating member 6 has a projection on the end face of the second filter element mechanism 4 along the axial direction of the filter element 100, so that the first operating member 6 is in the first state. In this way, it can be ensured that the first operating member 6 can at least partially resist the end face of the second filter element mechanism 4. Generally speaking, the cross-section of the second filter element mechanism 4 on the radial plane is circular, the cross-section of the first filter element mechanism 3 on the radial plane is annular, and the axis of the first filter element mechanism 3 is the same as the axis of the second filter element mechanism 4. When the cross-section of the first filter element mechanism 3 on the radial plane is annular, the filter element 100 can be locked and unlocked with the main housing 200 of the water purification device by rotation, and the filter element 100 can also be directly installed in the main housing 200 of the water purification device at any angle, and the user does not need to align the shape. Similarly, the second filter element mechanism 4 can be directly installed in the accommodating cavity 31 of the first filter element mechanism 3 at any angle, and the shape cannot be aligned.

[0062] Preferably, the projection of the first operating portion 32 on the end surface of the second filter element 4 along the axial direction of the filter element 100 covers at least one diameter of the second filter element 4. In this way, the user can rotate the filter element 100 with less force after holding the first operating portion 32.

[0063] When the first clamping portion 61 is engaged with the second clamping portion 34, the user can hold the first operating member 6 to operate the entire filter element 100, and install the first filter element mechanism 3 on the water purification device or remove it from the water purification device. In the above embodiment, the first operating member 6 can serve as both the first operating portion 32 and the limiting mechanism.

[0064] In a possible implementation, Figure 1 As shown, the second operating part 41 may include: a second operating member 7 installed on the end face of the second filter element mechanism 4 close to the first end 1. The user can hold the second operating member 7 to take the second filter element mechanism 4 out of the accommodating cavity 31 of the first filter element mechanism 3. Preferably, the second filter element mechanism 4 has a recessed portion 43 on the end face close to the first end 1, and the second operating member 7 can rotate around the diameter on the end face of the second filter element mechanism 4 so as to embed itself into the recessed portion 43 or protrude from the end face of the second filter element mechanism 4. When the second operating member 7 is embedded in the recessed portion 43, the end face of the second filter element mechanism 4 close to the first end 1 is substantially flush with the end face of the first filter element mechanism 3 close to the first end 1, which helps the first operating member 6 to abut against the end face of the second filter element mechanism 4 to limit the second filter element mechanism 4 in the axial direction of the filter element 100 so that the second filter element mechanism 4 is fixed in the first filter element mechanism 3.

[0065] In a preferred embodiment, the second filter element mechanism 4 has a first alignment portion on the end face close to the first end 1, which may be a raised rib extending in the diameter direction, and the first operating member 6 of the first filter element mechanism 3 has a second alignment portion matching the first alignment portion, and when the first operating member 6 is in the first state, the first alignment portion is aligned with the second alignment portion so that the second filter element mechanism 4 is at a correct specific angle, thereby facilitating the second water outlet unit 42 of the second filter element mechanism 4 to achieve water channel docking with the interface unit of the main housing 200 of the water purification device.

[0066] The first filter unit 37 in the first filter element mechanism 3 and the second filter unit in the second filter element mechanism 4 can be one or more filter units of any type, and are not limited in the present application.

[0067] In a feasible embodiment, the first filter unit 37 has a clean water outlet, and the sixth port 332 is connected to the clean water outlet. The second filter unit includes a post-filter unit 48 having a water inlet end, and the water inlet end is connected to the fourth port 423 .

[0068] As a preference, Figure 4 FIG. 1 is a cross-sectional view of a filter element in a first embodiment of the present invention. Figure 4As shown, the first filter unit 37 can be a reverse osmosis membrane filter unit or a nanofiltration membrane filter unit. The first filter element mechanism 3 can also include an isolation sleeve 352 disposed in the inner side wall 351 of the first housing 35, the lower end of the isolation sleeve 352 is sealed with the inner side wall 351, a first flow channel 353 is formed between the isolation sleeve 352 and the inner side wall 351, and the inner side wall 351 has a through hole 3511 connected to the first flow channel 353. The first filter element mechanism 3 has a first water outlet unit 33, and the first water outlet unit 33 includes a fifth port 331, a sixth port 332 and a seventh port 333 opened on the first shell 35; the outer wall of the first filter unit 37 is a waste water outlet, the inner wall 351 of the first filter unit 37 is a clean water outlet, and the end of the first filter unit 37 is a raw water inlet; the raw water inlet is connected with the fifth port 331, the clean water outlet is connected with the sixth port 332 through the through hole 3511 and the first flow channel 353, and the waste water outlet is connected with the seventh port 333.

[0069] Corresponding to the first filter element mechanism, such as Figure 4 As shown, in a feasible embodiment, the second filter element mechanism 4 may include a second housing 44, a second filter unit disposed in the second housing 44, and the second filter unit may include an outer shell 45 disposed in the second housing 44, a central tube 46 disposed in the outer shell 45, a pre-filter unit 47 and a post-filter unit 48. The second housing 44 wraps around other components in the second filter element mechanism 4, including the outer shell 45. A second flow channel 49 is formed between the outer shell 45 and the second housing 44. The pre-filter unit 47 is sleeved outside the central tube 46, and one end of the central tube 46 is connected to the water outlet end of the post-filter unit 48. The pre-filter mechanism and the post-filter mechanism are arranged in a vertical direction. The second water inlet unit 42 includes a first port 421, a second port 422 and a fourth port 423 opened on the second housing 44. A third port 451 is provided on the outer shell 45; an annular space is provided between the outer wall of the pre-filter unit 47 and the outer shell 45, the outer wall of the pre-filter unit 47 is the inlet end, and the first port 421 is connected to the annular space; the inner wall 351 of the pre-filter mechanism is the outlet end, and the outlet end is connected to the second port 422; the fourth port 423 is connected to the water inlet end of the post-filter unit 48 through the second flow channel 49 and the third port 451.

[0070] Specifically, the pre-filter unit 47 has an inlet end and an outlet end, and the post-filter unit 48 has an inlet end and an outlet end. The pre-filter unit 47 is used to perform primary filtration on water, thereby removing larger particles of impurities in the water. The pre-filter unit 47 can be generally tubular, and there is an annular space between the outer wall of the pre-filter unit 47 and the shell 45. The outer wall of the pre-filter unit 47 is the inlet end, and the first port 421 is connected to the annular space. Water flows into the second filter element mechanism 4 from the first port 421 of the second shell 44, and then reaches the annular space, and then enters the pre-filter unit 47 from the outer wall of the pre-filter unit 47 for filtration. The inner side wall 351 of the pre-filter unit 47 is the outlet end, and the outlet end is connected to the second port 422. The water filtered by the pre-filter unit 47 flows out from the inner side wall 351, and then flows out of the second filter element mechanism 4 through the second port 422 on the second shell 44.

[0071] In a feasible embodiment, a support frame 471 with a hollow structure may be provided inside the pre-filter unit 47, and the pre-filter unit 47 is sleeved on the support frame 471. The support frame 471 is used to support the radial direction of the pre-filter unit 47 on the one hand, and the water flowing out from the inside of the pre-filter unit 47 can continue to flow upward through the support frame 471, and then flow to the second port 422 of the second housing 44 and flow out. The third port 451 is connected to the water inlet end of the post-filter unit 48. The outlet pipe is used to guide the water filtered by the post-filter unit 48 through the pre-filter unit 47, and finally discharge it from the second filter element mechanism 4. When the support frame 471 is present, the central tube 46 can pass through the support frame 471, and there can be a gap between the central tube 46 and the support frame 471, so as to facilitate the water flowing out from the inside of the pre-filter unit 47 to flow upward. The water flowing out of the second filter element 4 flows into the fifth port 331 of the first filter element 3, enters the raw water inlet at the end of the first filter unit 37, and the waste water formed flows out from the waste water outlet on the outer wall of the first filter unit 37, and then passes through the seventh port 333 on the first housing 35 to be discharged from the second filter element 4. The clean water formed flows out from the clean water outlet on the inner wall 351 of the first filter unit 37, passes through the through hole 3511 of the inner wall 351, and the first flow channel 353 between the isolation sleeve 352 and the inner wall 351, and finally flows out from the sixth port 332 of the first housing 35.

[0072] The purified water flowing out of the first filter element 3 flows into the second flow channel 49 between the outer shell 45 and the second shell 44 through the fourth port 423 of the second shell 44, and the third port 451 at the lower end of the outer shell 45, and reaches the water inlet end of the post-filter unit 48. After being filtered by the post-filter unit 48, the purified water flows upward from the water outlet end of the post-filter unit 48 to the central pipe 46, and then flows upward out of the second filter element 4 through the central pipe 46.

[0073] As a preference, Figure 5 FIG. 1 is a cross-sectional view of a filter element in a second embodiment of the present invention. Figure 5 As shown, the difference between this embodiment and the first embodiment is that the second filter element mechanism 4 includes: a central tube 46, a pre-filter unit 47, and a post-filter unit 48 having a second housing 453. An annular space is formed between the pre-filter unit 47, the post-filter unit 48 and the inner side wall 351 of the first filter element mechanism 3, and the annular space is divided into an independent first annulus 81 and a second annulus 82. For example, the annular space is divided into an independent first annulus 81 and a second annulus 82 by an annular partition on the side wall of the second housing 453. The first filter element mechanism 3 includes a first housing 35 and a first filter unit 37 disposed in the first housing 35. The first housing 35 includes an inner side wall 351, and a through hole 3511 is opened on the inner side wall 351. The through hole 3511 is connected to the second annulus 82. The first water inlet unit 33 includes a fifth port 331 and a seventh port 333 opened on the first housing 35. The raw water inlet is connected to the fifth port 331, and the waste water outlet is connected to the seventh port 333. The second water inlet unit 42 includes a first port 421 and a second port 422. Since the pre-filter unit 47 is not covered by its own independent shell, the first port 421 and the second port 422 can be directly opened on the first shell 35. A first annulus 81 is provided between the outer wall of the pre-filter unit 47 and the inner wall 351 of the first shell 35. The outer wall of the pre-filter unit 47 is the inlet end, and the first port 421 is connected to the first annulus 81. The inner wall 351 of the pre-filter mechanism is the outlet end, and the outlet end is connected to the second port 422. The clean water outlet is connected to the water inlet end of the post-filter unit 48 through the through hole 3511 of the inner wall 351, the second annulus 82, and the third port 451.

[0074] In the second embodiment, water can flow from the first port 421 of the first housing 35 into the first annulus 81 between the outer wall of the pre-filter unit 47 and the inner wall 351 of the first housing 35, and then enter the pre-filter unit 47 from the outer wall of the pre-filter unit 47 for filtration. The inner wall 351 of the pre-filter unit 47 is an outlet end, and the outlet end is connected to the second port 422. The water filtered by the pre-filter unit 47 flows out from the inner wall 351, and then flows out through the second port 422 on the first housing 35. Afterwards, the water passing through the pre-filter unit 47 flows into the fifth port 331 of the first filter element mechanism 3, enters the raw water inlet at the end of the first filter unit 37, and the waste water formed flows out from the waste water outlet of the outer wall of the first filter unit 37, and then is discharged from the second filter element mechanism 4 through the seventh port 333 on the first housing 35. The formed clean water flows out from the clean water outlet of the inner side wall 351 of the first filter unit 37, and then flows through the through hole 3511 of the inner side wall 351 of the first shell 35, the second annulus 82, and the third port 451 of the second shell 453 to the water inlet end of the post-filter unit 48. After being filtered by the post-filter unit 48, the clean water flows upward from the water outlet end of the post-filter unit 48 to the central pipe 46, and is discharged upward from the central pipe 46 to the second filter element mechanism 4.

[0075] In the above-mentioned embodiments, the post-filter unit 48 mainly plays the role of effectively removing organic matter, residual chlorine and other radioactive substances in the water, and has the functions of decolorization, deodorization and the like. In a feasible embodiment, the post-filter unit 48 may include: a microfiltration filter element and activated carbon, and the incoming water first passes through the activated carbon and then through the microfiltration filter element. The activated carbon is mainly used to more thoroughly absorb the foreign color and odor in the clean water, adjust the taste of the clean water, and inhibit the regeneration of bacteria in the clean water. The microfiltration filter element is mainly used to filter out micron- or nano-scale particles and bacteria in the water.

[0076] In a preferred embodiment, the post-filter unit 48 may include: a first spray-bonded cotton and a second spray-bonded cotton arranged opposite to each other. The first spray-bonded cotton and the second spray-bonded cotton extend in the horizontal direction, and their side walls are closely attached to the inner wall of the second shell 453. The activated carbon is in granular form, and the activated carbon is arranged in the space between the first spray-bonded cotton and the second spray-bonded cotton. The first spray-bonded cotton and the second spray-bonded cotton are mainly used to limit and contain the granular activated carbon. The second shell 453 may include a sealing cover at the lower end, and the third port 451 on the second shell 453 may be arranged on the sealing cover. The sealing cover may be detachably connected, so as to facilitate the replacement of the microfiltration filter element and the activated carbon in the second shell 453. The water filtered by the first filter element mechanism 3 may flow into the second shell 453 from the third port 451 on the sealing cover, and then flow through the first spray-bonded cotton and then be filtered by the activated carbon, and then flow out from the second spray-bonded cotton and enter the microfiltration filter element. The outer wall of the microfiltration filter element is the inlet. After being filtered by the microfiltration filter element, the water flows out from the middle of the upper end surface of the microfiltration filter element, and then flows into the central tube 46 and is discharged to the outside of the second filter element mechanism 4.

[0077] In the present application, the water outlet unit of the filter element 100 is located at the second end 2 of the filter element 100. In this way, the entire filter element 100 can be directly and quickly inserted into the main housing 200 of the water purification device at the second end 2 and the water channel connection between the filter element 100 and the main housing 200 can be completed. The filter element 100 can also be quickly and conveniently removed from the main housing 200 of the water purification device from the first end 1 through the first operating portion 32 to achieve quick replacement of the entire filter element 100. When only the second filter element mechanism 4 needs to be replaced, the user can remove the second filter element mechanism 4 from the accommodating cavity 31 of the first filter element mechanism 3, and then install a new second filter element mechanism 4 and then limit the limiting mechanism, so that only the second filter element mechanism 4 can be replaced. When only the first filter element mechanism 3 needs to be replaced, the filter element 100 is taken out from the main housing 200 of the water purification device through the first operating part 32 from the first end 1, the second filter element mechanism 4 is taken out from the accommodating chamber 31 of the first filter element mechanism 3, and then the taken out second filter element mechanism 4 is installed in the new first filter element mechanism 3 and limited by the limiting mechanism, and finally the new first filter element mechanism 3 with the second filter element mechanism 4 is installed in the main housing 200 of the water purification device through the first operating part 32, and the water outlet unit at the second end of the filter element is directly connected to the water purification device, so that only the replacement of the first filter element 100 is completed. Therefore, through the above process, the entire filter element 100 can be replaced conveniently and quickly, and only the second filter element mechanism 4 can be replaced alone, and only the first filter element mechanism 3 can be replaced alone. In addition, since the second filter element mechanism 4 is detachably installed in the accommodating chamber 31 of the first filter element mechanism 3, the two can form a whole, which effectively improves the integration of the filter element 100.

[0078] In the present application, the replacement of the first filter element mechanism 3 and the second filter element mechanism 4 is not limited to the above-described method, and other methods or structures that can be replaced can be used, and there is no limitation on them in the present application.

[0079] A water purification device is also proposed in the present application, which may include: a main housing 200, having a chamber 2001 on the main housing 200; a filter element 100 such as any of the above-mentioned ones, the filter element 100 can be set in the chamber 2001, and the filter element 100 can be removed from the main housing 200 by holding the first operating part 32.

[0080] In a specific manner, the user can hold the first operating portion 32 formed by the first operating member 6, thereby taking the filter element 100 out of the chamber 2001 in the main housing 200 and disassembling it. For example, the first filter element mechanism 3 has a first threaded portion 36 at one end close to the second end 2, and the main housing 200 has a second threaded portion matching the first threaded portion 36. When the first operating member 6 is rotated, the first threaded portion 36 is screwed or disengaged with the second threaded portion, so that the filter element 100 and the main housing 200 are switched between a locked state and an unlocked state. In this manner, the filter element 100 and the main housing 200 can be switched between a locked state and an unlocked state by holding the first operating member 6 and rotating the first operating member 6 around the axis of the filter element 100. When the filter element 100 and the main housing 200 are transformed into an unlocked state, the filter element 100 can be pulled out of the chamber 2001 in the main housing 200 by holding the first operating member 6. After a new filter element 100 is installed in the chamber 2001 in the main housing 200, the first operating member 6 can be held and rotated around the axis of the filter element 100 to switch the filter element 100 and the main housing 200 to a locked state. In the locked state, the filter element 100 cannot be separated from the main housing 200.

[0081] Moreover, the water purification device may include: a boosting device and an interface unit. When the filter element 100 and the main housing 200 are in a locked state, each interface in the interface unit is connected to the water outlet unit of the filter element 100, for example, it can be connected to the first water outlet unit 33 of the first filter element mechanism 3 and / or the second water outlet unit 42 of the second filter element mechanism 4, so that the second port 422 is connected to the inlet of the boosting device, and the outlet of the boosting device is connected to the fifth port 331. In a feasible embodiment, when the first water outlet unit 33 includes a sixth port 332 and the second water outlet unit 42 includes a fourth port 423, the sixth port 332 is connected to the fourth port 423. The water treated by the pre-filter unit 47 in the second filter element mechanism 4 can be pressurized by the boosting device and then input into the first filter element mechanism 3, so that the filtering speed of the first filter element mechanism 3 can be increased.

[0082] Only one filter element 100 needs to be installed on the main housing 200 of the water purification device in the present application, and the pre-filtration unit 47, the reverse osmosis membrane filtration unit or the nanofiltration membrane filtration unit, and the post-filtration unit 48 can be provided to achieve purification and filtration of raw water with different effects, and the installation and removal of the filter element 100 are very convenient and quick.

[0083] like Figure 4 As shown, the second filter element mechanism 4 may further include: a connecting mechanism 410 having one end connected to the inlet end and the other end connected to the water outlet end, and the connecting mechanism 410 can conduct from the water outlet end direction to the inlet end direction.

[0084] In a feasible embodiment, the connecting mechanism 410 may include a one-way valve, the inlet of the one-way valve is connected to the water outlet, and the outlet of the one-way valve is connected to the inlet. In the above manner, the connecting mechanism 410 can only be conducted from the water outlet to the inlet, so that the separation between raw water and purified water is achieved during the normal water production process, and the raw water cannot flow to the water outlet of the post-filter unit 48 through the connecting mechanism 410 to be discharged for use by users. Since there are foreign objects in the raw water, it may cause the outlet of the one-way valve to be blocked or enter the inside of the one-way valve to cause the inside of the one-way valve to be blocked. Therefore, the connecting mechanism 410 may include a filter screen, which is arranged at the inlet and / or outlet of the one-way valve, so that the above problems can be effectively avoided. After the foreign objects are intercepted by the filter screen, the connecting mechanism 410 can be regularly disassembled and its filter screen can be cleaned. In other feasible embodiments, the connecting mechanism 410 can also be other components that can only be conducted from the water outlet to the inlet, and no limitation is made to it in this application.

[0085] When the first filter element mechanism 3 has filtered to a certain extent, the dirt and impurities in the water will be deposited on the membrane of the first filter element 100 unit. When the water purification device is in standby mode, the raw water on the raw water side of the membrane will slowly penetrate the membrane to reach the clean water side of the membrane, thereby causing the TDS value of the water on the clean water side to increase. In this way, when the water purification system produces water normally next time, the TDS of this part of the water just released is high. When the water purification device needs to flush the first filter element 100 unit, the clean water that has passed through the post-filter unit 48 in the second filter element mechanism 4 can flow back to the inlet end of the pre-filter unit 47 in the second filter element mechanism 4 through the connecting mechanism 410. This part of the clean water flows out of the second filter element mechanism 4 after passing through the pre-filter unit 47 again, and then flushes the membrane of the first filter element 100 unit of the first filter element mechanism 3, so that the raw water on the raw water side of the first filter element 100 unit is replaced by clean water. In this way, when the water purification device is in standby mode, even if the purified water on the raw water side slowly permeates through the membrane to reach the purified water side of the membrane, the degree of increase in the TDS value of the water on the purified water side will be greatly reduced. Through the above process, the TDS (total dissolved solids) of this part of the water can be effectively reduced when the water purification system just releases water in the next normal water production.

[0086] In a preferred embodiment, the connecting mechanism 410 can be connected from the water outlet to the inlet under preset conditions, and the preset conditions can be when the water purification device does not output purified water to the outside, that is, when the water purification device flushes the second filter element mechanism 4 and replaces the raw water in the second filter element 100 unit with purified water. When the water purification device produces water normally and outputs purified water to the outside, the connecting mechanism 410 can be connected from the water outlet to the inlet, or it can be disconnected from the water outlet to the inlet.

[0087] The water purification device in the present application does not need to add additional branch water pipes for the return of purified water, which effectively avoids the increase in the volume of the water purification device and makes the water path of the water purification device simpler. The water purification device directly opens a return water channel inside the second filter element mechanism 4, and integrates the connecting mechanism 410 into the return water channel inside the second filter element mechanism 4, thereby realizing the separation of raw water and purified water during normal water production, and realizing that the purified water flowing out of the post-filter unit 48 in the second filter element mechanism 4 can flow back to the inlet end of the pre-filter unit 47 in the second filter element mechanism 4 during the flushing process, and then flushes the first filter element mechanism 3 to replace the raw water on the raw water side of the first filter element 100 unit with purified water.

[0088] like Figure 4 As shown, in this embodiment, the housing 45 includes a first housing 452 for accommodating the pre-filter unit 47 and a second housing 453 for accommodating the post-filter unit 48, and the upper end of the second housing 453 is sealed and connected to the lower end of the first housing 452. A recess 4531 is provided on the side wall of the second housing 453, and the connecting mechanism 410 is arranged in the recess 4531, which can be arranged in the horizontal direction or the vertical direction. A through hole connecting the recess 4531 and the water outlet is provided on the second housing 453. The water filtered by the post-filter unit 48 can flow into the recess 4531 through the through hole on the second housing 453, and then can enter the end of the connecting mechanism 410 close to the center, that is, the inlet of the connecting mechanism 410 is close to the center of the housing 45, and the outlet of the connecting mechanism 410 is close to the side wall of the housing 45.

[0089] like Figure 4As shown, the first housing 452 is sleeved outside the second housing 453, and there is a gap between the uppermost side wall of the second housing 453 and the inner wall of the first housing 452, and the recess 4531 is connected to the annular space through the gap. The water flowing out of the outlet of the connecting mechanism 410 can enter the gap between the uppermost side wall of the second housing 453 and the inner wall of the first housing 452, and then flow upward to the annular space between the outer side wall of the pre-filter unit 47 and the first housing 452. Through the above structure, the clean water flowing out of the post-filter unit 48 in the second filter element mechanism 4 can be returned to the inlet end of the pre-filter unit 47 in the second filter element mechanism 4 during the flushing process.

[0090] like Figure 5 As shown, in another embodiment, only the post-filter unit 48 in the second filter element mechanism 4 has a second housing 453. The connecting mechanism 410 is installed on the second housing 453. A through hole connected to the water outlet is provided on the second housing 453. The water filtered by the post-filter unit 48 can flow to the connecting mechanism 410 through the through hole on the second housing 453, and then can enter the connecting mechanism 410 and flow out from the outlet of the connecting mechanism 410, and the outlet of the connecting mechanism 410 is connected to the first annulus 81. Through the above structure, the clean water flowing out of the post-filter unit 48 in the second filter element mechanism 4 can be realized to flow back to the inlet end of the pre-filter unit 47 in the second filter element mechanism 4 during the flushing process.

[0091] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for various purposes. The term "consisting essentially of ... " describing a combination should include determined elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel features of the combination. The use of the terms "comprising" or "including" to describe the combination of elements, ingredients, parts or steps here also contemplates the implementation method consisting essentially of these elements, ingredients, parts or steps. Here, by using the term "may", it is intended to illustrate that any attribute described that "may" includes is optional. Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "one" used to describe an element, ingredient, part or step is not said to exclude other elements, ingredients, parts or steps.

[0092] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can be referred to each other. The above embodiments are only for illustrating the technical concept and features of the present invention. The purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A filter element, characterized in that: The filter element comprises: a first filter element mechanism and a second filter element mechanism, wherein the first filter element mechanism comprises a first housing and a first filter unit disposed in the first housing, and an accommodating cavity extending in an axial direction is formed on the inner side wall of the first housing; the second filter element mechanism comprises a second housing and a second filter unit disposed in the second housing; the second filter element mechanism can be detachably installed in the accommodating cavity of the first filter element mechanism; The first filter element mechanism has a first water inlet unit connected to the water purification device for conveying water in and out; the second filter element mechanism has a second water inlet unit connected to the water purification device for conveying water in and out; the first water inlet unit has at least one sixth port for outputting filtered water from the first filter element mechanism, and the second water inlet unit has at least one fourth port for inputting filtered water into the second filter element mechanism, and the fourth port and the sixth port can be communicated; Among them, the first water outlet unit and the second water outlet unit are located at the same end of the filter element; the cross-section of the second filter element mechanism on the radial plane is circular, the cross-section of the first filter element mechanism on the radial plane is annular, and the axis of the first filter element mechanism is the same as the axis of the second filter element mechanism.

2. The filter element according to claim 1, characterized in that: The first filter unit has a clean water outlet, and the sixth port is connected to the clean water outlet; the second filter unit includes a post-filter unit with a water inlet end, and the water inlet end is connected to the fourth port.

3. The filter element according to claim 2, characterized in that: The first filter element mechanism also includes an isolation sleeve arranged in the inner side wall of the first shell, a first flow channel is formed between the isolation sleeve and the inner side wall, and the inner side wall has a through hole connected to the first flow channel.

4. The filter element according to claim 3, characterized in that: The first water inlet unit also includes a fifth port and a seventh port opened on the first shell; the outer wall of the first filter unit is a wastewater outlet, the inner wall of the first filter unit is a clean water outlet, and the end of the first filter unit is a raw water inlet; the raw water inlet is connected to the fifth port, the clean water outlet is connected to the sixth port through the through hole and the first flow channel, and the wastewater outlet is connected to the seventh port.

5. The filter element according to claim 2, characterized in that: The second filter unit further comprises a shell disposed in the second housing, a central tube disposed in the shell, a pre-filter unit and the post-filter unit, and a second flow channel is formed between the shell and the second housing; The pre-filter unit is sleeved outside the central tube, and one end of the central tube is connected to the water outlet end of the post-filter unit; the pre-filter unit and the post-filter unit are arranged in a vertical direction.

6. The filter element according to claim 5, characterized in that: The second nozzle unit further comprises a first port and a second port opened on the second shell, and the shell has a third port; There is an annular space between the outer wall of the pre-filter unit and the outer shell, the outer wall of the pre-filter unit is the inlet end, and the first port is connected to the annular space; the inner wall of the pre-filter unit is the outlet end, and the outlet end is connected to the second port; the fourth port is connected to the water inlet end of the post-filter unit through the second flow channel and the third port.

7. The filter element according to claim 2, characterized in that: The post-filtration unit comprises: a microfiltration filter element and activated carbon, and the incoming water first passes through the activated carbon and then passes through the microfiltration filter element.

8. The filter element according to claim 5, characterized in that: The pre-filter unit has an inlet end, and the post-filter unit has a water outlet end; The second filter element mechanism further includes: a communication mechanism with one end connected to the inlet end and the other end connected to the water outlet end, and the communication mechanism can conduct from the water outlet end direction to the inlet end direction.

9. The filter element according to claim 8, characterized in that: The communication mechanism comprises a one-way valve, the inlet of the one-way valve is connected to the water outlet, and the outlet of the one-way valve is connected to the inlet.

10. The filter element according to claim 8, characterized in that: The shell includes a first shell for accommodating the pre-filter unit and a second shell for accommodating the post-filter unit, the upper end of the second shell is sealedly connected to the lower end of the first shell; the side wall of the second shell has a recess, the connecting mechanism is arranged in the recess, and the second shell is provided with a through hole connecting the recess and the water outlet.

11. The filter element according to claim 10, characterized in that: An annular space is provided between the outer side wall of the pre-filter unit and the outer shell; the first outer shell is sleeved outside the second outer shell, a gap is provided between the uppermost side wall of the second outer shell and the inner wall of the first outer shell, and the recess is connected to the annular space through the gap; The middle part of the upper end of the second shell is provided with an opening connected with the water outlet end, and the central tube is inserted in the opening.

12. The filter element according to claim 1, characterized in that: The filter element further comprises a limiting mechanism, and when the second filter element mechanism is installed in the accommodating cavity of the first filter element mechanism, the limiting mechanism can keep the first filter element mechanism and the second filter element mechanism relatively fixed in the circumferential direction.

13. The filter element according to claim 1, characterized in that: The filter element has a first end and a second end opposite to each other, and the first filter element mechanism has a first operating part for installing the filter element on or removing it from a water purification device, and the first operating part is close to the first end of the filter element; the first water outlet unit and the second water outlet unit are located at the second end of the filter element.

14. The filter element according to claim 13, characterized in that: The first operating portion includes a first operating member installed on the end face of the first filter element mechanism close to the first end, and the first operating member has at least two states. In the first state, the first operating member abuts against the end face of the second filter element mechanism to limit the second filter element mechanism in the axial direction of the filter element so that the second filter element mechanism is fixed in the first filter element mechanism; in the second state, the first operating member is disengaged from the end face of the second filter element mechanism so that the second filter element mechanism can be taken out of the accommodating cavity.

15. The filter element according to claim 14, characterized in that: One end of the first operating member is connected to the end face of the first filter element mechanism in a hinged manner, and the other end of the first operating member has a first clamping portion. The end face of the first filter element mechanism close to the first end has a second clamping portion, and the first clamping portion can be engaged with the second clamping portion; when the first clamping portion is engaged with the second clamping portion, the first operating member has a projection on the end face of the second filter element mechanism along the axial direction of the filter element, so that the first operating member is in a first state.

16. The filter element according to claim 15, characterized in that The cross section of the second filter element mechanism on a radial plane is circular, and the projection of the first operating portion on the end surface of the second filter element mechanism along the axial direction of the filter element covers at least one diameter of the second filter element mechanism.

17. The filter element according to claim 1, characterized in that The filter element has a first end and a second end opposite to each other, and the second filter element mechanism has a second operating part for installing the second filter element mechanism into the accommodating cavity of the first filter element mechanism or removing the second filter element mechanism from the accommodating cavity of the first filter element mechanism; the second operating part is close to the first end of the filter element.

18. The filter element according to claim 17, characterized in that The second operating part includes: a second operating member installed on the end face of the second filter element mechanism close to the first end, the second filter element mechanism has a recessed portion on the end face of the first end, and the second operating member can rotate around the diameter on the end face of the second filter element mechanism so that it can be embedded in the recessed portion or protrude from the end face of the second filter element mechanism.

19. The filter element according to claim 13, characterized in that: An end of the first filter element mechanism close to the second end has a first threaded portion.

20. The filter element according to claim 1, characterized in that The first filtration unit is a reverse osmosis membrane filtration unit or a nanofiltration membrane filtration unit.

21. A water purification device, characterized in that: The water purification device comprises: a main housing, wherein one end surface of the main housing has a downwardly recessed chamber; and a filter element as described in any one of claims 1 to 20, wherein the filter element can be disposed in the chamber.

22. The water purification device according to claim 21, characterized in that: The first filter element mechanism has a first operating part for installing the filter element on or removing it from the water purification device, and the filter element and the main housing are switched between a locked state and an unlocked state by rotating the first operating part around the axis of the filter element.

23. The water purification device according to claim 22, characterized in that: The first filter element mechanism has a first threaded portion at one end close to the second end, and the main housing has a second threaded portion matching the first threaded portion. When the first operating member is rotated, the first threaded portion is screwed into or disengaged from the second threaded portion, so that the filter element and the main housing are switched between a locked state and an unlocked state.

24. The water purification device according to claim 22, characterized in that: The water purification device also includes: a boosting device; an interface unit. When the filter element and the main housing are in a locked state, each interface in the interface unit is connected to the first water outlet unit of the first filter element mechanism and / or the second water outlet unit of the second filter element mechanism, so that the second port is connected to the inlet of the boosting device, the outlet of the boosting device is connected to the fifth port, and the sixth port is connected to the fourth port.

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