CN112439236A

CN112439236A - Leading filter assembly, leading filter and water purification system

Info

Publication number: CN112439236A
Application number: CN201910824493.3A
Authority: CN
Inventors: 陈宝; 陈子斌; 董小虎; 林艺辉; 凌润锌; 董平安
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2019-09-02
Filing date: 2019-09-02
Publication date: 2021-03-05
Anticipated expiration: 2039-09-02

Abstract

The invention relates to a preposed filtering component, a preposed filter and a water purifying system, wherein the preposed filtering component comprises an outer framework, a limiting piece and a filtering unit, the filtering unit is inserted in the outer framework, the filtering unit can move in the axial direction relative to the outer framework, the limiting piece is used for preventing the filtering unit from rotating in the circumferential direction along with the outer framework, the filtering unit comprises a first filtering part and a second filtering part which are sequentially arranged in the axial direction, a recess is arranged on the outer framework, a bulge corresponding to the recess is arranged on the filtering unit, the recess is spirally arranged along the circumferential direction of the outer framework, when the outer framework rotates in the circumferential direction, the bulge can move in the recess, when the bulge moves to a first position, the outside water flows to a second side from the first side of the second filtering part, when the bulge moves to a second position, the outside water reaches the second side of the second filtering part after being filtered by the first filtering part, from the second side to the first side of the second filter portion. The cleaning problem is solved, and the safety of water quality is guaranteed.

Description

Leading filter assembly, leading filter and water purification system

Technical Field

The invention relates to the field of water purification, in particular to a pre-filter assembly, a pre-filter and a water purification system.

Background

Tap water flows through a large number of pipelines before entering a user's home, and various impurities are mixed in the pipelines when flowing through the pipelines, and the impurities can affect the health of the user and damage water consuming appliances. Therefore, a pre-filter is generally installed on a user-to-home source pipe to filter tap water. After the filter membrane is used for a period of time, the filter membrane in the pre-filter needs to be cleaned so as to ensure the filtering effect. However, the cleaning process is generally assisted by elastic members such as springs in the pre-filter, and the metal members such as springs affect the water quality.

Disclosure of Invention

Based on this, it is necessary to provide a pre-filter assembly, which can solve the cleaning problem and simultaneously ensure the water quality safety.

A preposed filtering component comprises an outer framework, a limiting piece and a filtering unit, wherein the filtering unit is inserted into the outer framework, the filtering unit is movable in the axial direction relative to the outer framework, the limiting piece is used for preventing the filtering unit from rotating in the circumferential direction along with the outer framework, the filtering unit comprises a first filtering part and a second filtering part which are sequentially arranged in the axial direction, a recess is arranged on the outer framework, a bulge corresponding to the recess is arranged on the filtering unit, or a recess is arranged on the filtering unit, a bulge corresponding to the recess is arranged on the outer framework, and the recess is spirally arranged along the circumferential direction of the outer framework;

when the outer skeleton rotates in the circumferential direction relative to the filtering unit, the protrusion can move in the recess, when the protrusion moves to a first position, external water flows to the second side from the first side of the second filtering portion, and when the protrusion moves to a second position, the external water reaches the second side of the second filtering portion after being filtered by the first filtering portion and flows to the first side from the second side of the second filtering portion.

The scheme provides a front-mounted filter assembly, in the use process, the outer framework and the filter unit are respectively provided with the concave part and the convex part which are matched, so that when the outer framework rotates along the circumferential direction, the convex part moves in the concave part, and under the further limiting action of the limiting part, the filter unit can only move in the axial direction. When the protrusion moves to the first position, the external water flows from the first side to the second side of the second filter part, thereby realizing the filtering process. When the bulge moves to the second position, the outside water reaches the second side of the second filtering part after being filtered by the first filtering part and then flows to the first side from the second side of the second filtering part, so that the back washing of the second filtering part is realized, and the back washing process is implemented. In the whole adjusting process, the switching between the filtering state and the back washing state is realized directly by means of the matching of the outer framework, the concave part and the convex part on the filtering unit and the limiting effect of the limiting part, the influence of metal pieces such as springs on water quality is effectively avoided while the cleaning problem is solved, and the safety of the water quality is ensured while the cleaning problem is solved.

In one embodiment, when a recess is formed in the exoskeleton and a protrusion corresponding to the recess is formed in the filter unit, the recess is a strip-shaped groove formed in the exoskeleton, the strip-shaped groove is divided into a filter section, a flushing section and a middle transition section, the filter section and the flushing section are axially arranged at intervals, the filter section and the flushing section are circumferentially arranged in a staggered manner, the middle transition section is communicated with the filter section and the flushing section, the protrusion is located at the first position when the protrusion is located in the filter section, and the protrusion is located at the second position when the protrusion is located in the flushing section.

In one embodiment, the filter section and the flushing section are perpendicular to the axial direction of the exoskeleton.

In one embodiment, the limiting member is a mesh cover located at the opening of the outer skeleton, the mesh cover can be connected with the bottle body, the mesh cover is fixed in the circumferential direction relative to the bottle body, when the protrusion moves to the first position, the mesh cover is covered on the outer side of the first filtering portion, outside water flows from the outer side to the inner side of the second filtering portion after passing through the mesh cover, when the protrusion moves to the second position, the first filtering portion and the mesh cover are staggered, and outside water flows from the outer side to the inner side of the first filtering portion, then reaches the inner side of the second filtering portion, and flows from the inner side to the outer side of the second filtering portion.

In one embodiment, the filter unit further includes a sealing section located between the first filter part and the second filter part, the pre-filter assembly is capable of being installed in the bottle body, the mesh cover is in sealing connection with the sealing section when the protrusion moves to the first position, the sealing section is spaced apart from the bottle body so that external water can reach the outside of the second filter part through a gap between the sealing section and the bottle body, and the sealing section is in sealing connection with the bottle body when the protrusion moves to the second position so that external water flows from the outside to the inside of the first filter part and then to the inside of the second filter part and flows from the inside to the outside of the second filter part.

In one embodiment, the filter unit comprises a small framework, an inner framework, a back washing filter screen and a filter screen, wherein the small framework and the inner framework are sequentially arranged in the axial direction, the back washing filter screen is sleeved outside the small framework to form the first filter part, and the filter screen is sleeved outside the inner framework to form the second filter part.

In one embodiment, the filter unit further comprises a pressing cover connected with the second filter part, the pressing cover is located on one side of the second filter part far away from the first filter part, and the protrusion is arranged on the pressing cover.

The utility model provides a front filter, includes bottle, water guide joint and foretell front filter assembly, front filter assembly sets up in the bottle, the water guide joint is installed the open end of bottle, the water guide joint has into water runner and play water runner, works as the arch removes when the first position, the first side of second filter house with the flowing water clearance has between the bottle, the flow of intaking with flowing water clearance intercommunication, go out the water runner with the second side intercommunication of second filter house, works as the arch removes when the second position, the flow of intaking with first filter house intercommunication, go out the water runner with the first side intercommunication of second filter house.

The above-mentioned scheme provides a leading filter, through set up the leading filter assembly of any above-mentioned embodiment in the bottle, make when the arch moves to the first position, the water inlet runner on the water guide joint with the flowing water clearance communicates, thereby make water can flow to the second side from the first side of second filter part, then from the play water runner outflow, realize the filtration process. When the pre-filter needs to be backwashed after a period of filtration, the outer framework can be rotated, so that the filter unit moves in the axial direction, and the protrusion moves to the second position. At the moment, the water inlet flow channel of the water guide joint is communicated with the first filtering part, water reaches the second side of the second filtering part after being filtered by the first filtering part, then flows to the first side from the second side of the second filtering part, and finally flows out from the water outlet flow channel. The back washing of the second filtering part is realized, and the safety of water quality in the filtering process is guaranteed. In the adjusting process, the two states are switched without using metal parts such as springs and the like, so that the cleaning problem is solved, and the safety of water quality is guaranteed.

In one embodiment, the prefilter further comprises a rotating member and a water discharge valve, both of which are disposed on the bottle body, the rotating member extends into the bottle body and is connected to the exoskeleton for rotating the exoskeleton circumferentially, the bottle body is provided with a water discharge port, the water discharge port is communicated with the first side of the second filter part, and when the water discharge valve is opened, the water inlet of the water discharge valve is communicated with the water discharge port.

A water purification system comprises a water inlet pipe, a water outlet pipe and the pre-filter, wherein the water inlet pipe is communicated with a water inlet of a water guide joint, and the water outlet pipe is communicated with a water outlet of the water guide joint.

According to the scheme, the pre-filter in any embodiment is arranged between the water inlet pipe and the water outlet pipe, so that the pre-filter is backwashed without the aid of metal pieces such as springs and the like to realize an adjusting process, the cleaning problem is solved, and the safety of water quality is guaranteed.

Drawings

FIG. 1 is an assembly view of a pre-filter assembly according to the present embodiment;

FIG. 2 is an exploded view of the pre-filter assembly of FIG. 1;

FIG. 3 is a schematic view of a filter unit of the pre-filter assembly of FIG. 1;

FIG. 4 is a schematic structural diagram of the prefilter of this embodiment during normal filtration;

FIG. 5 is a schematic structural diagram of the pre-filter in the present embodiment during backwashing;

fig. 6 is a schematic structural view of the prefilter of this embodiment during normal flushing.

Description of reference numerals:

10. a pre-filter; 11. a bottle body; 12. a water conducting joint; 121. a water inlet flow channel; 122. a water outlet flow channel; 13. a running water gap; 14. a rotating member; 15. a drain valve; 20. a pre-filter assembly; 21. an outer skeleton; 211. recessing; 2111. a filtration section; 2112. a washing section; 2113. a middle transition section; 22. a limiting member; 23. a filtration unit; 231. a first filter unit; 2311. a small skeleton; 2312. backwashing the filter screen; 232. a second filter unit; 2321. an inner skeleton; 2322. filtering a filter screen; 233. a protrusion; 234. a gland; 235. and a sealing section.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

As shown in fig. 1 and 2, in one embodiment, a front filter assembly 20 is provided, including an exoskeleton 21, a stopper 22, and a filter unit 23. The filter unit 23 is inserted in the outer frame 21, and the filter unit 23 is movable in the axial direction with respect to the outer frame 21. The stopper 22 is configured to prevent the filter unit 23 from rotating in the circumferential direction following the exoskeleton 21. The filter unit 23 comprises a first filter portion 231 and a second filter portion 232 which are sequentially arranged in the axial direction, a recess 211 is formed in the outer framework 21, a protrusion 233 corresponding to the recess 211 is formed in the filter unit 23, the recess 211 is arranged along the circumferential spiral of the outer framework 21, and when the outer framework 21 rotates in the circumferential direction relative to the filter unit 23, the protrusion 233 can move in the recess 211. Or, a recess 211 is provided on the filter unit 23, a protrusion 233 corresponding to the recess 211 is provided on the outer frame 21, and when the outer frame 21 rotates in the circumferential direction with respect to the filter unit 23, the protrusion 233 can move in the recess 211.

The movement of the protrusion 233 in the recess 211 is guided in the axial direction of the filter unit 23 by the limiting action of the limiting member 22.

Specifically, when the protrusion 233 is moved to the first position, as shown in fig. 4, the external water flows from the first side to the second side of the second filter part 232, thereby performing a filtering process. When the protrusion 233 moves to the second position, as shown in fig. 5, the external water reaches the second side of the second filter part 232 after being filtered by the first filter part 231, and flows from the second side to the first side of the second filter part 232, so as to perform a back washing process on the second filter part 232.

In the whole adjusting process, the switching between the filtering state and the backwashing state is realized directly by means of the matching of the outer framework 21 and the concave 211 and the convex 233 on the filtering unit 23 and the limiting effect of the limiting part 22, the cleaning problem is solved, meanwhile, the influence of metal resetting parts such as springs on the water quality is effectively avoided, and the safety of the water quality is ensured while the cleaning problem is solved.

Specifically, based on the fact that the recess 211 is directly formed on the outer frame 21 or the filter unit 23, the protrusion 233 may be made of a material similar to the material of the outer frame 21 or the filter unit 23, and thus there is no influence of a metal reset member such as a spring on water quality.

Specifically, the depressions 211 are spirally formed in the circumferential direction of the outer frame 21, and not only the depressions 211 rotated one, two or more times in the circumferential direction, but also the depressions 211 rotated less than 180 ° in the circumferential direction of the outer frame 21. That is, as shown in fig. 1 and 2, the recess 211 is inclined in the axial direction in the circumferential direction of the outer frame 21 within the above range.

For example, in one embodiment, as shown in fig. 1 and 2, when the outer frame 21 is provided with a recess 211 and the filter unit 23 is provided with a protrusion 233 corresponding to the recess 211, the recess 211 is a strip-shaped groove provided on the outer frame 21. The strip-shaped groove is divided into a filtering section 2111, a flushing section 2112 and an intermediate transition section 2113, the filtering section 2111 and the flushing section 2112 are arranged at intervals in the axial direction, the filtering section 2111 and the flushing section 2112 are arranged in a staggered mode in the circumferential direction, and the intermediate transition section 2113 is communicated with the filtering section 2111 and the flushing section 2112.

The projection 233 is in the first position when the projection 233 is in the filter section 2111 and the projection 233 is in the second position when the projection 233 is in the flushing section 2112. That is, when the protrusions 233 are moved to the filtering section 2111 by rotating the exoskeleton 21, the pre-filter assembly 20 enters a filtering state as shown in fig. 4, and when the protrusions 233 are moved to the washing section 2112, the pre-filter assembly 20 enters the backwashing state as shown in fig. 5.

Furthermore, as shown in fig. 1 and 2, the filtering section 2111 and the flushing section 2112 have a certain length in the circumferential direction of the outer frame 21, so that the protrusions 233 can be stably located in this state when moving to the corresponding sections, thereby ensuring effective performance of the filtering process and the backwashing process.

Further, in one embodiment, as shown in fig. 1 and 2, the filter section 2111 and the flushing section 2112 are perpendicular to the axial direction of the exoskeleton 21. Therefore, when the protrusion 233 moves to the filtering section 2111 and the flushing section 2112, the corresponding position can be stably located, and the situation that the position of the filtering unit 23 is changed under the action of water flow impact is avoided.

Specifically, the specific position of the recess 211 on the outer frame 21 may be designed according to actual conditions, and the position of the protrusion 233 only needs to correspond to the recess 211, so as to switch the filtering state and the backwashing state of the pre-filter assembly 20.

Specifically, in one embodiment, as shown in fig. 1 to 3, the recess 211 is disposed at an end of the outer frame 21 away from the first filter portion 231, and the protrusion 233 is disposed at an end of the filter unit 23 away from the first filter portion 231. Therefore, when the rotating piece 14 for realizing the rotation of the outer framework 21 moves, the convex 233 can be moved in the concave 211 efficiently and reliably, and the situation of blocking is avoided.

Further, as shown in fig. 2 and 3, the filter unit 23 further includes a pressing cover 234, the pressing cover 234 is connected to the second filter portion 232, the pressing cover 234 is located on a side of the second filter portion 232 away from the first filter portion 231, and the protrusion 233 is disposed on the pressing cover 234.

Specifically, the protrusions 233 may be disposed at the outer circumference of the cover 234 at positions opposite to the recesses 211.

Moreover, the pressing cover 234 and the second filter part 232 may be detachably connected, so that the pressing cover 234, the protrusion 233 and the outer frame 21 may be integrally connected, and then the second filter part 232 and the pressing cover 234 may be connected during assembly, thereby implementing an assembly process.

Further, in one embodiment, as shown in fig. 1 to 3, the position-limiting member 22 is a net cover located at the opening of the exoskeleton 21, and as shown in fig. 4 to 6, the net cover can be connected to the bottle 11, and the net cover is fixed in the circumferential direction relative to the bottle 11. The specific fixing mode can adopt a buckling mode or an adhesion mode and the like.

As shown in fig. 4 and 6, when the protrusion 233 moves to the first position, the mesh cover is enclosed at the outside of the first filter part 231, and the external water flows from the outside to the inside of the second filter part 232 after passing through the mesh cover. As shown in fig. 5, when the protrusion 233 moves to the second position, the first filter 231 is offset from the mesh cover, and the external water flows from the outside of the first filter 231 to the inside, then reaches the inside of the second filter 232, and flows from the inside of the second filter 232 to the outside.

It should be noted that, as shown in fig. 2 to 6, the mesh cover herein refers to a structure having a complete side wall in the circumferential direction, i.e. the mesh cover has an annular side wall; but the end surface is of a net-shaped structure and can be used for water flow to pass through, namely the end surface of the net cover is provided with water guide holes for water flow to pass through.

So that when the protrusions 233 are moved to the first position, as shown in fig. 4 and 6, the annular side wall of the mesh cover shields the first filter portion 231, so that water flows down to the outside of the second filter portion 232, and water flowing from the outside to the inside of the second filter portion 232 can flow out through the end surface of the mesh cover.

Further, in one embodiment, as shown in fig. 1 to 6, the filter unit 23 further includes a sealing section 235, and the sealing section 235 is located between the first filter portion 231 and the second filter portion 232. The front filter assembly 20 can be installed in the bottle body 11, and when the protrusion 233 is moved to the first position, the net cover is sealingly connected to the sealing section 235, thereby shielding the first filter 231 from the inside and preventing water from filtering through the first filter 231. The sealing section 235 is spaced apart from the bottle body 11, so that external water can reach the outside of the second filter portion 232 through a gap between the sealing section 235 and the bottle body 11.

Of course, alternatively, when the protrusion 233 moves to the first position, the mesh cover may not completely cover the first filter 231 inside, and the water may enter the inside after being filtered by the first filter 231 and then flow out from the water outlet passage 122 of the water guide connector 12, and may perform a filtering process together with the second filter 232.

As shown in fig. 5, when the protrusion 233 moves to the second position, the sealing portion 235 is sealingly connected to the bottle body 11, and the mesh cover is misaligned with the first filter 231, so that external water can flow only from the outside to the inside of the first filter 231, then to the inside of the second filter 232, and then from the inside to the outside of the second filter 232. Thereby implementing a backwashing process of the second filtering part 232.

More specifically, in an embodiment, as shown in fig. 4 to 6, the filtering unit 23 includes a small framework 2311, an inner framework 2321, a backwashing filter screen 2312 and a filtering filter screen 2322, the small framework 2311 and the inner framework 2321 are sequentially disposed in an axial direction, the backwashing filter screen 2312 is sleeved outside the small framework 2311 to form the first filtering portion 231, and the filtering filter screen 2322 is sleeved outside the inner framework 2321 to form the second filtering portion 232.

As shown in fig. 1 to 6, the small bobbin 2311, the inner bobbin 2321 and the outer bobbin 21 described herein are each a structure in which the side walls have through holes, i.e., water can pass through the small bobbin 2311, the inner bobbin 2321 and the outer bobbin 21. After the backwashing filter screen 2312 is sleeved on the small framework 2311 and the filter screen 2322 is sleeved on the inner framework 2321, water can permeate from one side of the first filter part 231 and the second filter part 232 to the other side.

Further specifically, as shown in fig. 1 to 6, the first filter part 231 and the second filter part 232 are both cylindrical structures, and impurities in water are filtered when the water flows through the side walls of the cylindrical structures.

Further, when the filter unit 23 includes the inner frame 2321, the sealing segment 235 may be an annular protrusion formed by extending an end of the inner frame 2321 close to the small frame 2311, and then a sealing member such as a sealing ring is further disposed on the annular protrusion to form the sealing segment 235.

Further, as shown in fig. 4 to 6, in another embodiment, a prefilter 10 is provided, which includes a bottle 11, a water guide connector 12, and the prefilter assembly 20 described above. The pre-filter assembly 20 is disposed in the bottle body 11, and the water guide connector 12 is installed at an opening end of the bottle body 11. The water guide joint 12 has a water inlet passage 121 and a water outlet passage 122, when the protrusion 233 moves to the first position, a water flowing gap 13 is formed between the first side of the second filtering portion 232 and the bottle body 11, the water inlet passage 121 is communicated with the water flowing gap 13, the water outlet passage 122 is communicated with the second side of the second filtering portion 232, when the protrusion 233 moves to the second position, the water inlet passage 121 is communicated with the first filtering portion 231, and the water outlet passage 122 is communicated with the first side of the second filtering portion 232.

By providing the pre-filter assembly 20 of any one of the above embodiments in the bottle body 11, when the protrusion 233 is moved to the first position, the water inlet channel 121 of the water guide connector 12 is communicated with the water flowing gap 13, so that water can flow from the first side to the second side of the second filter part 232 and then flow out of the water outlet channel 122, thereby implementing a filtering process. When it is desired to backwash the prefilter 10 after a certain period of filtration, the outer frame 21 may be rotated so that the filter unit 23 is moved in the axial direction, so that the protrusions 233 are moved to the second position. At this time, the water inlet passage 121 of the water guide joint 12 is communicated with the first filter 231, and the water reaches the second side of the second filter 232 after being filtered by the first filter 231, then flows to the first side from the second side of the second filter 232, and finally flows out from the water outlet passage 122. The back washing of the second filtering part 232 is realized, and the safety of water quality in the filtering process is guaranteed. In the adjusting process, the two states are switched without using metal parts such as springs and the like, so that the cleaning problem is solved, and the safety of water quality is guaranteed.

Further, in one embodiment, the prefilter 10 further includes a rotating member 14 and a water discharge valve 15 both disposed on the bottle 11, wherein the rotating member 14 extends into the bottle 11 and is connected to the outer frame 21 for rotating the outer frame 21 in the circumferential direction. The bottle body 11 is provided with a water outlet which is communicated with the first side of the second filter unit 232, and when the water discharge valve 15 is opened, the water inlet of the water discharge valve 15 is communicated with the water outlet, so that water after backwashing the second filter unit 232 can be discharged from the water outlet through the water discharge valve 15.

Specifically, when the filter unit 23 includes the small frame 2311, the inner frame 2321, the backwashing filter 2312 and the filter screen 2322, the outer side of the second filter part 232 is spaced apart from the inner side of the bottle 11, and when the drain valve 15 is opened, the water in the bottle 11 can flow out of the drain valve 15.

As shown in fig. 4, during normal filtration, the drain valve 15 is closed, and the filtered water can only flow out of the pre-filter 10 through the water outlet passage 122 of the water guide connector 12. As shown in fig. 6, when the protrusion 233 is located at the first position, the drain valve 15 may also be opened, so that water may partially flow out of the drain valve 15 to perform a normal flushing effect. As shown in fig. 5, during back flushing, the water entering from the water inlet channel 121 may flow from the second side to the first side of the second filter unit 232 after being filtered by the first filter unit 231, and the second filter unit 232 may be back flushed, and part of the back flushed water may flow out of the drain valve 15.

Further, in another embodiment, a water purification system is provided, which comprises a water inlet pipe, a water outlet pipe and the pre-filter 10, wherein the water inlet pipe is communicated with the water inlet of the water guide connector 12, and the water outlet pipe is communicated with the water outlet of the water guide connector 12.

By arranging the pre-filter 10 in any embodiment between the water inlet pipe and the water outlet pipe, the pre-filter 10 is backwashed, and meanwhile, the adjusting process is realized without metal parts such as springs, so that the cleaning problem is solved, and the safety of water quality is guaranteed.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A preposed filtering component is characterized by comprising an outer framework, a limiting part and a filtering unit, wherein the filtering unit is inserted into the outer framework, the filtering unit can move in the axial direction relative to the outer framework, the limiting part is used for preventing the filtering unit from rotating in the circumferential direction along with the outer framework, the filtering unit comprises a first filtering part and a second filtering part which are sequentially arranged in the axial direction, a recess is arranged on the outer framework, a bulge corresponding to the recess is arranged on the filtering unit, or a recess is arranged on the filtering unit, a bulge corresponding to the recess is arranged on the outer framework, and the recess is spirally arranged along the circumferential direction of the outer framework;

2. The prefilter assembly according to claim 1 wherein when a recess is provided in said exoskeleton and a protrusion corresponding to said recess is provided in said filter unit, said recess is a strip-shaped groove provided in said exoskeleton, said strip-shaped groove is divided into a filter section, a flushing section and an intermediate transition section, said filter section and said flushing section are axially spaced apart, said filter section and said flushing section are circumferentially offset, said intermediate transition section communicates said filter section and said flushing section, said protrusion is located at said first position when said protrusion is located in said filter section, and said protrusion is located at said second position when said protrusion is located in said flushing section.

3. The pre-filter assembly of claim 2, wherein the filter section and the flush section are perpendicular to an axial direction of the exoskeleton.

4. The front filter assembly of claim 1, wherein the limiting member is a net cover located at the opening of the outer frame, the net cover is capable of being connected to the bottle body, the net cover is fixed in a circumferential direction with respect to the bottle body, when the protrusion moves to the first position, the net cover is covered around the outer side of the first filter portion, the outside water passes through the net cover and flows from the outer side of the second filter portion to the inner side, when the protrusion moves to the second position, the first filter portion is staggered with respect to the net cover, the outside water flows from the outer side of the first filter portion to the inner side, then reaches the inner side of the second filter portion, and flows from the inner side of the second filter portion to the outer side.

5. The pre-filter assembly as set forth in claim 4 wherein the filter unit further comprises a sealing section between the first filter portion and the second filter portion, the pre-filter assembly being capable of being installed in the bottle, the mesh cap being in sealing connection with the sealing section when the protrusion is moved to the first position, the sealing section being spaced apart from the bottle such that the external water can reach the outside of the second filter portion through a gap between the sealing section and the bottle, and the sealing section being in sealing connection with the bottle such that the external water flows from the outside of the first filter portion to the inside and then to the inside of the second filter portion and from the inside of the second filter portion to the outside when the protrusion is moved to the second position.

6. The front filter assembly according to any one of claims 1 to 5, wherein the filter unit comprises a small frame, an inner frame, a back flush filter screen and a filter screen, the small frame and the inner frame are sequentially arranged in an axial direction, the back flush filter screen is sleeved outside the small frame to form the first filter portion, and the filter screen is sleeved outside the inner frame to form the second filter portion.

7. The pre-filter assembly as in any one of claims 1 to 5, wherein the filter unit further comprises a gland coupled to the second filter portion, the gland being located on a side of the second filter portion remote from the first filter portion, the protrusion being provided on the gland.

8. A pre-filter, comprising a bottle body, a water guide joint and the pre-filter assembly of any one of claims 1 to 7, wherein the pre-filter assembly is disposed in the bottle body, the water guide joint is installed at an opening end of the bottle body, the water guide joint has a water inlet channel and a water outlet channel, when the protrusion moves to the first position, a water gap is formed between a first side of the second filter portion and the bottle body, the water inlet channel is communicated with the water gap, the water outlet channel is communicated with a second side of the second filter portion, when the protrusion moves to the second position, the water inlet channel is communicated with the first filter portion, and the water outlet channel is communicated with the first side of the second filter portion.

9. The prefilter of claim 8 further comprising a rotating member and a drain valve both disposed on said bottle body, said rotating member extending into said bottle body and being connected to said exoskeleton for rotating said exoskeleton circumferentially, said bottle body having a drain opening communicating with said first side of said second filter portion, said drain valve having a water inlet communicating with said drain opening when said drain valve is open.

10. A water purification system comprising a water inlet pipe, a water outlet pipe and the pre-filter of claim 8 or 9, wherein the water inlet pipe is communicated with the water inlet of the water guide connector, and the water outlet pipe is communicated with the water outlet of the water guide connector.