CN218794475U - Filter equipment and purifier - Google Patents

Abstract

The application provides a filter equipment and purifier, filter equipment includes casing, cyclic annular filter core and end cover. Annular filter core is located the casing, annular filter core is including the terminal surface of intaking, the terminal surface of going out water, inner ring side and outer loop side, the terminal surface of intaking is carried on the back with the axial of going out water terminal surface along annular filter core mutually, the outer loop side includes that the outer loop is intake face and outer loop and is connected the face, the outer loop is intake face and is connected in the terminal surface of intaking, and with the internal surface interval of casing, the outer loop is connected the face and is connected in the outer loop and intake face, and connect in the internal surface of casing, the inner ring side is connected face and inner ring play water face including the inner ring, the inner ring is connected the face and is connected face and play water terminal surface, seal end cover is connected in the inner ring and is connected the face. Through the design of both sides water inlet and both sides water outlet, the filtering flow channel of the annular filter element is increased, the condition that impurities in the annular filter element are concentrated and accumulated is improved, and the service life of the annular filter element is prolonged.

Description

Filter equipment and purifier

Technical Field

The application relates to the field of filtration, in particular to a filtering device and a water purifier.

Background

In present filter core structure, water filters the back through the filter core, and the impurity of remaining in the filter core can cause the jam to the filter core, influences the life of filter core.

SUMMERY OF THE UTILITY MODEL

The present application aims to provide a filtering apparatus and a water purifier to improve at least one of the above technical problems. The present application achieves the above object by the following technical solutions.

In a first aspect, embodiments of the present application provide a filter device including a housing, an annular filter element, and a seal end cap. Annular filter core is located the casing, annular filter core is including the terminal surface of intaking, the terminal surface of going out water, inner ring side and outer loop side, the terminal surface of intaking is carried on the back with the axial of going out water terminal surface along annular filter core mutually, the outer loop side includes that the outer loop is intake face and outer loop and is connected the face, the outer loop is intake face and is connected in the terminal surface of intaking, and with the internal surface interval of casing, the outer loop is connected the face and is connected in the outer loop and intake face, and connect in the internal surface of casing, the inner ring side is connected face and inner ring play water face including the inner ring, the inner ring is connected the face and is connected face and play water terminal surface, seal end cover is connected in the inner ring and is connected the face.

In one embodiment, the length of the inner ring connection surface in the axial direction of the annular filter element is smaller than the length of the inner ring outlet surface in the axial direction of the annular filter element.

In one embodiment, the length of the outer ring connection surface in the axial direction of the annular filter element is smaller than the length of the outer ring water inlet surface in the axial direction of the annular filter element.

In one embodiment, the end cap includes an end cap body and a boss, the end cap body covers the water inlet end face, the boss is protruded from one side of the end cap body facing the annular filter element, and the boss is inserted into the annular filter element and abuts against the inner ring connecting face.

In one embodiment, the filter device further comprises a secondary filter element and a tertiary filter element, the secondary filter element and the tertiary filter element are positioned in the housing and on one side of the water outlet end face of the annular filter element, and the secondary filter element is positioned between the annular filter element and the tertiary filter element.

In an embodiment, the casing includes casing water inlet and casing delivery port, and casing same one side of casing is located to casing water inlet and casing delivery port, and lies in the tertiary filter core and deviates from one side of second grade filter core.

In one embodiment, the filtering device further comprises a water inlet pipe, wherein the water inlet pipe sequentially penetrates through the third-stage filter element, the second-stage filter element, the annular filter element and the sealing end cover; the water inlet pipe is provided with a water pipe water inlet and a water pipe water outlet which are communicated, the water pipe water inlet is communicated with the shell water inlet, and the water pipe water outlet is exposed on one side of the sealing end cover, which is deviated from the annular filter element.

In one embodiment, the filter device further comprises a connecting end cover, the connecting end cover is inserted into the third-stage filter element, and the water inlet pipe is further arranged through the connecting end cover.

In one embodiment, the housing includes a first positioning portion and a second positioning portion, the first positioning portion and the second positioning portion are both protruded on an inner surface of the housing, the end cap is connected to the first positioning portion, and the three-stage filter element is connected to the second positioning portion.

In a second aspect, an embodiment of the present application provides a water purifier, where the water purifier includes a housing and a filtering device in any one of the above embodiments, and the filtering device is installed in the housing.

In the filter equipment and the purifier that this application embodiment provided, water can get into annular filter core inside through the terminal surface of intaking and outer ring face of intaking simultaneously and filter, because water can be preferred to flow along the less direction of resistance, then get into annular filter core by the terminal surface of intaking and carry out filterable water can be preferred to go out the surface of water through the inner ring and flow, and get into annular filter core by the outer ring face of intaking and carry out filterable water can be preferred to flow through the face of going out water, filter equipment has adopted the terminal surface simultaneously to intake, side is intake and terminal surface play water, the design of side play water, design through both sides are intake and both sides are gone out water helps annular filter core to form a plurality of filtration runners, make impurity can disperse in a plurality of positions of annular filter core, the concentrated accumulational circumstances of impurity emergence in the annular filter core has been improved, help prolonging the life of annular filter core.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 shows a schematic structural diagram of a filtering apparatus provided in an embodiment of the present application.

Fig. 2 shows an enlarged schematic view at ii of fig. 1.

Fig. 3 shows an enlarged schematic view of fig. 1 at iii.

Fig. 4 shows a schematic structural diagram of a water purifier provided in an embodiment of the present application.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It should be apparent that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any inventive step based on the embodiments in the present application, are within the scope of protection of the present application.

Referring to fig. 1 to 3, in order to facilitate understanding, thick arrows in fig. 1 to 3 indicate a flow direction of water, the present embodiment provides a filtering apparatus 100, and the filtering apparatus 100 may be used to filter impurities in water.

The filter assembly 100 includes a housing 110, an annular filter element 130, and a seal end cap 150. Annular filter element 130 is located casing 110, annular filter element 130 includes water inlet end face 131, water outlet end face 133, inner ring side face 135 and outer ring side face 137, water inlet end face 131 is opposite to water outlet end face 133 along the axial of annular filter element 130, outer ring side face 137 includes outer ring water inlet face 1371 and outer ring connection face 1373, outer ring water inlet face 1371 is connected in water inlet end face 131, and is spaced from the internal surface of casing 110, outer ring connection face 1373 is connected in outer ring water inlet face 1371, and is connected in the internal surface of casing 110, inner ring side face 135 includes inner ring connection face 1353 and inner ring water outlet face 1351, inner ring connection face 1353 is connected in water inlet end face 131, inner ring water outlet face 1351 is connected in inner ring connection face 1353 and water outlet end face 133, sealing end cap 150 is connected in inner ring connection face 1353.

Thus, water can enter annular filter element 130 through water inlet end face 131 and outer loop water inlet face 1371 simultaneously and filter inside, understandably, water can preferentially flow along the direction that the resistance is less, then the water that enters annular filter element 130 by water inlet end face 131 and filters can preferentially flow out through inner loop water outlet face 1351, and the water that enters annular filter element 130 by outer loop water inlet face 1371 and filters can preferentially flow out through water outlet face 133. Filter equipment 100 is in the use, water filters the back through cyclic annular filter core 130, the impurity of aquatic can be by the separation inside cyclic annular filter core 130, can make the quality of water after cyclic annular filter core 130 filters better, and the impurity of being separated inside cyclic annular filter core 130 can lead to the fact the jam to cyclic annular filter core 130, influence cyclic annular filter core 130's life, and filter equipment 100 has adopted simultaneously that the terminal surface is intake, side intake and terminal surface play water, the design of side play water, design through both sides intake and both sides play water helps cyclic annular filter core 130 to form a plurality of filtration runners, make impurity can disperse in a plurality of positions of cyclic annular filter core 130, the impurity emergence in cyclic annular filter core 130 concentrates accumulational circumstances, help prolonging cyclic annular filter core 130's life.

For example, to facilitate understanding, the water inlet end surface 131 is divided into a first water inlet surface and a second water inlet surface, the first water inlet surface is connected with the inner ring connection surface 1353, and the second water inlet surface is connected with the first water inlet surface and the outer ring water inlet surface 1371; the inner ring water outlet surface 1351 is divided into a first water outlet side surface and a second water outlet side surface, the first water outlet side surface is connected with the inner ring connecting surface 1353, and the second water outlet side surface is respectively connected with the first water outlet side surface and the water outlet end surface 133. It can be understood that water will preferentially flow along the direction of smaller resistance, because the first water inlet surface is closest to the first water outlet side, water will preferentially enter the annular filter element 130 through the first water inlet surface and flow out from the first water outlet side, when the first water inlet surface is blocked to the filter flow channel between the first water outlet sides, water will enter the annular filter element 130 through the second water inlet surface, because the second water inlet surface is closest to the second water outlet side, water entering the annular filter element 130 through the second water inlet surface will flow out from the second water outlet side.

Moreover, for ease of understanding, the outer ring water inlet surface 1371 is divided into a first water inlet side surface and a second water inlet side surface, the first water inlet side surface is connected to the outer ring connecting surface 1373, and the second water inlet side surface is connected to the first water inlet side surface and the water inlet end surface 131; the water outlet end surface 133 is divided into a first water outlet surface and a second water outlet surface, the first water outlet surface is connected with the outer ring connecting surface 1373, and the second water outlet surface is connected with the first water outlet surface and the inner ring water outlet surface 1351 respectively. It will be appreciated that water will preferentially flow in the direction of lower resistance, and that water will preferentially enter the annular filter element 130 from the first water inlet side and exit from the first water outlet surface because the first water inlet side is closest to the first water outlet surface, and that water will enter the annular filter element 130 from the second water inlet side after the filter flow path between the first water inlet side and the first water outlet surface is blocked, and that water entering the annular filter element 130 from the second water inlet side will exit from the second water outlet surface because the second water inlet side is closest to the second water outlet surface.

So, increased the filtration runner between cyclic annular filter core 130 intake and the play water for one of them filtration runner of cyclic annular filter core 130 still has other filtration runners to supply water to pass through after blockking up, makes impurity can disperse in a plurality of positions of cyclic annular filter core 130, has improved the impurity emergence in the cyclic annular filter core 130 and has concentrated the accumulational condition, helps prolonging the life of cyclic annular filter core 130.

The annular filter element 130 may be a PP cotton swab or other filtering material.

The connection between the outer ring connection surface 1373 and the housing 110 may be made by a seal, which helps to improve the sealing effect between the outer ring connection surface 1373 and the housing 110 to prevent water from flowing in the gap between the outer ring connection surface 1373 and the housing 110. For example, in some embodiments, the filter device 100 may further include a sealing element, the annular filter element 130 may further include an annular groove, the annular groove is recessed in the outer annular water inlet surface 1371, the annular filter element 130 is sleeved in the annular groove and partially exposed out of the annular groove, and a portion of the sealing element exposed out of the annular groove abuts against an inner surface of the housing 110, so as to achieve sealing between the outer annular connecting surface 1373 and the inner surface of the housing 110, where the sealing element may be a rubber ring or other material. In other embodiments, the outer ring connecting surface 1373 and the inner surface of the housing 110 may be sealed by interference fit, bonding, etc.

In some embodiments, inner ring connection face 1353 may have a length in an axial direction of annular filter element 130 that is less than a length of inner ring water exit face 1351 in the axial direction of annular filter element 130. Therefore, the water outlet area of the annular filter element 130 is increased, impurities can be dispersed in a plurality of positions of the annular filter element 130, the condition that the impurities in the annular filter element 130 are concentrated and accumulated is improved, and the service life of the annular filter element 130 is prolonged.

In some embodiments, the length of outer ring connection face 1373 in the axial direction of annular filter element 130 may be less than the length of outer ring water inlet face 1371 in the axial direction of annular filter element 130. So, help enlarging the intake area of cyclic annular filter core 130 for impurity can disperse in a plurality of positions of cyclic annular filter core 130, has improved the interior impurity of cyclic annular filter core 130 and has taken place to concentrate the accumulational condition, helps prolonging cyclic annular filter core 130's life.

In some embodiments, the end cap 150 may include an end cap body 151 and a boss 153, and the end cap body 151 covers the water inlet end surface 131, so as to facilitate positioning of the annular filter element 130, and help to avoid deformation of the annular filter element 130 due to direct fixation of the annular filter element 130, thereby improving the filtering effect of the filtering apparatus 100. For example, the housing 110 may include a first positioning portion 115, the first positioning portion 115 is protruded from an inner surface of the housing 110, and the sealing end cap 150 is connected to the first positioning portion 115, so that the annular filter element 130 may be positioned, which helps to prevent the annular filter element 130 from being displaced toward one end of the housing 110, and may also facilitate subsequent installation of other components. Wherein, one side of the end cover body 151 of the sealing end cover 150 facing away from the boss 153 abuts against the first positioning portion 115.

Wherein, the area of the contact surface between the end cover body 151 and the water inlet end surface 131 may be smaller than the remaining area of the water inlet end surface 131. For example, in some embodiments, the water inlet end surface 131 may include a water inlet surface and a mounting surface, the water inlet surface includes a first water inlet surface and a second water inlet surface, the water inlet surface is connected to the outer ring water inlet surface 1371, the mounting surface is connected to the water inlet surface and the outer ring connection surface 1373, the mounting surface is covered by the end cover body 151, the area of the mounting surface is smaller than that of the water inlet surface, and thus, the water inlet area of the annular filter element 130 is increased, impurities may be dispersed in multiple positions of the annular filter element 130, the condition that impurities in the annular filter element 130 are concentrated and accumulated is improved, and the service life of the annular filter element 130 is prolonged.

In addition, the end cover body 151 and the mounting surface can be hermetically connected through bonding and the like, which is helpful for preventing water from flowing out through a gap between the end cover body 151 and the mounting surface and flowing out after being filtered by the annular filter element 130, and the filtering effect of the filtering device 100 is improved.

The boss 153 may be protruded from a side of the end cap body 151 facing the annular filter element 130, and the boss 153 may be inserted into the annular filter element 130 and abut against the inner ring connection surface 1353. Thus, the sealing end cover 150 and the annular filter element 130 are connected into a whole, the risk of an overlarge gap between the end cover body 151 and the annular filter element 130 caused by relative displacement between the end cover body 151 and the annular filter element 130 is reduced, and the filtering effect of the filtering device 100 is improved. For example, the boss 153 and the annular filter element 130 may be connected by interference fit, the diameter of the boss 153 may be slightly larger than the diameter of the inner ring of the annular filter element 130, and the boss 153 is inserted into the inner ring of the annular filter element 130, so as to implement interference fit. Meanwhile, the boss 153 and the annular filter element 130 are in interference fit with each other to seal the inner ring of the annular filter element 130, so that water is prevented from flowing out through a gap between the boss 153 and the inner ring connecting surface 1353 and flowing out without being filtered by the annular filter element 130, and the filtering effect of the filtering device 100 is improved. In addition, an adhesive layer may be disposed between the boss 153 and the inner ring connection surface 1353 to further enhance the sealing effect between the boss 153 and the inner ring connection surface 1353.

In some embodiments, the filter device 100 can also have a multi-stage filtering effect, for example, the filter device 100 can further include a secondary filter element 160 and a tertiary filter element 170, the secondary filter element 160 and the tertiary filter element 170 are located in the housing 110 and located on one side of the water outlet end surface 133 of the annular filter element 130, and the secondary filter element 160 is located between the annular filter element 130 and the tertiary filter element 170. So, water can carry out the secondary filter at second grade filter core 160 after cyclic annular filter core 130 filters, and the water after the filtration of second grade filter core 160 flows to tertiary filter core 170 once more and carries out the tertiary filtration back outflow, has promoted filter equipment 100's filter effect. In addition, the secondary filter element 160 can also function to support the annular filter element 130 and the tertiary filter element 170, helping to prevent the annular filter element 130 and the tertiary filter element 170 from moving toward the side of the secondary filter element 160. The housing 110 may further include a second positioning portion 117, the second positioning portion 117 protrudes from the inner surface of the housing 110, and the tertiary filter element 170 is connected to the second positioning portion 117, so as to help prevent the tertiary filter element 170 from moving to the side away from the secondary filter element 160.

The secondary filter element 160 may be a filter material, for example, the secondary filter element 160 may be gravel, cobblestone, manganese sand, magnetite filter material, porcelain sand filter material, activated carbon particles, or other filter materials. In other embodiments, the secondary filter element 160 may also be a PP cotton swab or other filtering material.

The third-stage filter element 170 may be a PP cotton rod, the third-stage filter element 170 may be in the shape of an annular cylinder, and the third-stage filter element 170 and the inner surface of the casing 110 may be connected by interference fit, so as to help prevent water in the second-stage filter element 160 from flowing out through a connection between the third-stage filter element 170 and the inner surface of the housing 500, and improve the filtering effect of the filtering apparatus 100, for example, the diameter of the outer ring of the third-stage filter element 170 may be slightly larger than the diameter of the inner surface of the casing 110, and the third-stage filter element 170 is inserted into the casing 110, so that interference fit between the third-stage filter element 170 and the inner surface of the casing 110 may be achieved.

In some embodiments, the shape of the tertiary filter element 170 may also conform to the shape of the annular filter element 130, thereby helping to extend the useful life of the filter apparatus 100. For example, the third stage filter element 170 may also include a water inlet end surface, a water outlet end surface, an inner ring side surface and an outer ring side surface, and when assembled, the water inlet end surface side of the third stage filter element 170 may face the water outlet end surface 133 of the ring-shaped filter element 130, or the water outlet end surface side of the third stage filter element 170 may face the water outlet end surface 133 of the ring-shaped filter element 130. And the inner ring of tertiary cartridge 170 may also be coupled with a seal end cap to seal the inner ring of tertiary cartridge 170.

In some embodiments, the housing 110 can include a housing inlet 111 and a housing outlet 113, and the housing inlet 111 and the housing outlet 113 can be disposed on the same side of the housing 110 and on a side of the tertiary cartridge 170 facing away from the secondary cartridge 160. In this manner, the integration of the filter device 100 can be improved to facilitate the arrangement of water pipes or other components connected to the filter device 100.

In some embodiments, the filter device 100 may further include a water inlet pipe 180, the water inlet pipe 180 sequentially penetrates through the tertiary filter element 170, the secondary filter element 160, the annular filter element 130, and the sealing end cap 150; the water inlet pipe 180 is provided with a water pipe inlet 181 and a water pipe outlet 183 which are communicated, the water pipe inlet 181 is communicated with the shell body inlet 111, and the water pipe outlet 183 is exposed at one side of the sealing end cover 150 departing from the annular filter element 130. Because the shell water inlet 111 and the shell water outlet 113 are arranged on the same side of the shell 110, the water inlet pipe 180 can guide the water on the shell water inlet 111 side to the water inlet end face 131 side of the annular filter element 130, and the water flows to the shell water outlet 113 after being filtered by the annular filter element 130, the secondary filter element 160 and the tertiary filter element 170, so that the integration level of the filter device 100 is improved.

For example, the end cap 150 may be provided with a first mounting through hole, the first mounting through hole penetrates the end cap body 151 and the boss 153, the water inlet pipe 180 is inserted into the first mounting through hole, and the water inlet pipe 180 and the first mounting through hole may be connected by interference fit, which helps to improve the sealing performance between the end cap 150 and the water inlet pipe 180, and improves the condition that water flows out through the gap between the water inlet pipe 180 and the end cap 150, thereby affecting the filtering effect of the filtering device 100. For example, the diameter of the water inlet tube 180 may be slightly larger than the diameter of the first mounting through-hole, such that an interference fit between the water inlet tube 180 and the end cap 150 may be achieved.

In addition, an adhesive layer may be further disposed between the water inlet pipe 180 and the sealing end cap 150, which is helpful to further improve the sealing effect between the water inlet pipe 180 and the sealing end cap 150.

In some embodiments, the filter device 100 may further include a connection end cap 190, the connection end cap 190 is inserted into the third-stage filter element 170, and the water inlet pipe 180 is further inserted through the connection end cap 190. In this manner, connecting end cap 190 can seal the inner ring of tertiary filter element 170, helping to prevent water from flowing directly through the inner ring of tertiary filter element 170 and flowing out without being filtered inside tertiary filter element 170.

For example, connecting end cover 190 can be equipped with second installation through-hole, and inlet tube 180 wears to locate second installation through-hole, can adopt interference fit to connect between inlet tube 180 and the second installation through-hole, helps promoting the leakproofness between connecting end cover 190 and the inlet tube 180, improves the condition that water flows through the gap between inlet tube 180 and the connecting end cover 190, influences filter device 100's filter effect. For example, the diameter of the water inlet pipe 180 may be slightly larger than the diameter of the second mounting through-hole, so that an interference fit between the water inlet pipe 180 and the connection end cap 190 may be achieved.

In addition, an adhesive layer can be arranged between the water inlet pipe 180 and the connecting end cover 190, which is helpful for further improving the sealing effect between the water inlet pipe 180 and the connecting end cover 190.

Referring to fig. 4, the present application further provides a water purifier 1000, where the water purifier 1000 includes a housing 500 and the filter device 100 in the above embodiments, and the filter device 100 is installed in the housing 500. Because the water purifier 1000 includes the filtering device 100, all the advantages of the water purifier 1000 including the filtering device 100 are not described herein.

In the filtering apparatus 100 and the water purifier 1000 provided by the application, water can enter the inside of the annular filter element 130 through the water inlet end face 131 and the outer ring water inlet face 1371 to be filtered simultaneously, because water can preferentially flow along the direction with smaller resistance, then the water filtered in entering the annular filter element 130 by the water inlet end face 131 can preferentially flow out through the inner ring water outlet face 1351, and the water filtered in entering the annular filter element 130 by the outer ring water inlet face 1371 can preferentially flow out through the water outlet end face 133, the filtering apparatus 100 simultaneously adopts the end face water inlet, the side water inlet and the end face water outlet, the design of the side water outlet, the design of the water inlet at two sides and the water outlet at two sides contributes to the annular filter element 130 to form a plurality of filtering flow channels, so that impurities can be dispersed in a plurality of positions of the annular filter element 130, the concentrated accumulation of the impurities in the annular filter element 130 is improved, and the service life of the annular filter element 130 is prolonged.

Furthermore, the description of the terms "some embodiments," "other embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiments or examples is included in at least one embodiment or example of the application. In this application, the schematic representations of the terms used above are not necessarily intended to be the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the various embodiments or examples and features of the various embodiments or examples described in this application can be combined and combined by those skilled in the art without being mutually inconsistent.

The above embodiments are only for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims (10)

1. A filter device, comprising:

a housing;

the annular filter element is positioned in the shell and comprises a water inlet end face, a water outlet end face, an inner ring side face and an outer ring side face, the water inlet end face and the water outlet end face are opposite to each other along the axial direction of the annular filter element, the outer ring side face comprises an outer ring water inlet face and an outer ring connecting face, the outer ring water inlet face is connected to the water inlet end face and is spaced from the inner surface of the shell, the outer ring connecting face is connected to the outer ring water inlet face and is connected to the inner surface of the shell, the inner ring side face comprises an inner ring connecting face and an inner ring water outlet face, the inner ring connecting face is connected to the water inlet end face, and the inner ring water outlet face is connected to the inner ring connecting face and the water outlet end face; and

a seal end cap connected to the inner ring connection face.

2. The filter apparatus of claim 1, wherein a length of the inner ring connection face in an axial direction of the annular filter element is smaller than a length of the inner ring outlet face in the axial direction of the annular filter element.

3. The filter apparatus of claim 1, wherein a length of the outer ring connection face in an axial direction of the annular filter element is less than a length of the outer ring water inlet face in the axial direction of the annular filter element.

4. The filter device according to claim 1, wherein the end cap comprises an end cap body and a boss, the end cap body is covered on the water inlet end surface, the boss is protruded on a side of the end cap body facing the annular filter element, and the boss is inserted into the annular filter element and abuts against the inner ring connecting surface.

5. The filter apparatus of claim 1, further comprising a secondary filter element and a tertiary filter element, the secondary filter element and the tertiary filter element being positioned within the housing and on one side of the outlet end face of the annular filter element, the secondary filter element being positioned between the annular filter element and the tertiary filter element.

6. The filter apparatus of claim 5, wherein the housing includes a housing inlet and a housing outlet, the housing inlet and the housing outlet being disposed on a same side of the housing and on a side of the tertiary filter element facing away from the secondary filter element.

7. The filter device according to claim 6, further comprising a water inlet pipe, wherein the water inlet pipe is sequentially arranged through the third-stage filter element, the second-stage filter element, the annular filter element and the sealing end cover; the inlet tube is equipped with the water pipe water inlet and the water pipe delivery port that are linked together, the water pipe water inlet intercommunication the casing water inlet, the water pipe delivery port expose in end cover deviates from one side of cyclic annular filter core.

8. The filtration device of claim 7, further comprising a connection end cap, wherein the connection end cap is inserted into the tertiary filter element, and the water inlet pipe further penetrates through the connection end cap.

9. The filter device according to claim 5, wherein the housing includes a first positioning portion and a second positioning portion, the first positioning portion and the second positioning portion are both protruded from an inner surface of the housing, the end cap is connected to the first positioning portion, and the tertiary filter element is connected to the second positioning portion.

10. A water purification machine, comprising:

a housing; and

the filter device according to any one of claims 1-9, which is mounted within the housing.

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