CN212631939U - Detachable filter and water purifying device - Google Patents

Abstract

The utility model relates to a detachable filter, include: the filter comprises a shell, a filter element, an upper end cover and a lower end cover, wherein the filter element comprises an upper fixing plate, a lower fixing plate, a central filter screen and a peripheral filter screen, the upper end cover is detachably connected with the shell and axially limits the filter element, a water inlet of the upper end cover is communicated with an inner cavity of the peripheral filter screen, a filtrate outlet of the upper end cover is communicated with the inner cavity of the central filter screen, the lower end cover is detachably connected with the shell, a sewage discharge outlet of the lower end cover is communicated with the inner cavity of the peripheral filter screen, and a sewage discharge outlet of the lower end cover seals one end. Can realize the two-stage filtration when detachable filter uses, effectively intercept great impurity in the filter screen, avoid blockking up pipeline or water pump. Meanwhile, the filter element is limited by the upper end cover and the lower end cover, no fixing structure is arranged between the filter element and the shell, the filter element can be taken out of the shell only by firstly disassembling the upper end cover and the lower end cover, and the disassembly is convenient. A water purification device with the detachable filter is also provided.

Description

Detachable filter and water purifying device

Technical Field

The utility model relates to a water treatment technical field, concretely relates to detachable filter still relates to a purifier who has above-mentioned detachable filter.

Background

When a traditional water purifying device is used for treating water sources such as river water, rainwater or sewage, the situation that the pipeline or a water pump is blocked by large impurities such as branches and leaves often accompanies the traditional water purifying device, so that the normal work of the water purifying device is influenced, and even the service life of the water purifying device is influenced. Meanwhile, the traditional water purifying device is not changed in disassembly when being blocked, so that the impurities are not convenient to remove.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide a detachable filter which can intercept large impurities and is convenient to detach. A water purification device with such a detachable filter is also proposed.

A removable filter comprising a housing; a filter element, the filter element is disposed in the shell, the filter element includes central filter screen and peripheral filter screen: the upper end cover is detachably connected with one end of the shell and is provided with a water inlet and a filtrate outlet, the water inlet is communicated with the inner cavity of the peripheral filter screen, the filtrate outlet is communicated with the inner cavity of the central filter screen, and the filtrate outlet is abutted against the filter element; the lower end cover is detachably connected with the other end of the shell, a sewage draining outlet and a plugging portion are arranged on the lower end cover, the sewage draining outlet is communicated with the inner cavity of the peripheral filter screen, and the plugging portion is abutted against the filter element and seals the inner cavity of the central filter screen.

Above-mentioned detachable filter can realize the two-stage filtration when using, effectively intercepts great impurity in the filter screen, avoids blockking up pipeline or water pump. Simultaneously, the filter core utilizes upper end cover and lower end cover spacing, does not have fixed knot to construct between filter core and the shell, and is connected between upper end cover and lower end cover and the casing can dismantle, consequently blocks up when seriously needing to wash in the filter screen, only need dismantle upper end cover and lower end cover earlier, can take out the filter core in the shell in order to wash, consequently dismantles the convenience.

In one embodiment, the upper end cover and the shell are fixed through a hoop, and the lower end cover and the shell are fixed through a hoop.

In one embodiment, the filter cartridge further comprises: the upper fixing plate is provided with a first central hole penetrating through the upper fixing plate, at least one first peripheral hole penetrating through the upper fixing plate is distributed around the first central hole, and first fixing pipes are respectively arranged on the first central hole and the first peripheral hole; the lower fixing plate is provided with a second central hole penetrating through the lower fixing plate, at least one second peripheral hole penetrating through the lower fixing plate is distributed around the second central hole, the position of the second central hole corresponds to that of the first central hole, the second peripheral holes correspond to the first peripheral holes one to one, and second fixing pipes are respectively arranged on the second central hole and the second peripheral holes; two ends of the central filter screen are respectively sleeved on a first fixed pipe arranged in the first central hole and a second fixed pipe arranged in the second central hole, and an inner cavity of the central filter screen is communicated with the first central hole and the second central hole; the peripheral filter screen is at least provided with one filter screen and distributed around the central filter screen, two ends of the peripheral filter screen are respectively sleeved on a first fixed pipe arranged in the first peripheral hole and a second fixed pipe arranged in the second peripheral hole, and an inner cavity of the peripheral filter screen is communicated with the first peripheral hole and the second peripheral hole corresponding to the positions of the first peripheral hole and the second peripheral hole; the water inlet is communicated with the inner cavity of the peripheral filter screen through the first peripheral hole, and the filtered liquid outlet is connected with the first central hole; the drain outlet is communicated with the inner cavity of the peripheral filter screen through the second peripheral hole, and the plugging part is embedded into the second central hole and plugs the second central hole.

In one embodiment, a handle is arranged on one surface of the upper fixing plate, which faces away from the lower fixing plate, and/or a handle is arranged on one surface of the lower fixing plate, which faces away from the upper fixing plate.

In one embodiment, the filter pore size of the central screen is equal to or smaller than the filter pore size of the peripheral screen.

In one embodiment, the central screen is cylindrical and the peripheral screen is cylindrical.

In one embodiment, the first stationary pipe and the second stationary pipe are identical in structure, and the central screen and the peripheral screen are identical in structure.

In one embodiment, both ends of the central screen are detachably connected to the first fixing tube and the second fixing tube, respectively.

In one embodiment, both ends of the peripheral screen are detachably connected to the first fixing tube and the second fixing tube, respectively.

A water purifying device is also provided, which comprises the detachable filter.

Above-mentioned but water purification unit's dismantlement formula filter can realize the two-stage filtration when using, effectively intercepts great impurity in the filter screen, avoids blockking up pipeline or water pump. Simultaneously, the filter core utilizes upper end cover and lower end cover spacing, does not have fixed knot to construct between filter core and the shell, and is connected between upper end cover and lower end cover and the casing can dismantle, consequently blocks up when seriously needing to wash in the filter screen, only need dismantle upper end cover and lower end cover earlier, can take out the filter core in the shell in order to wash, consequently dismantles the convenience.

Drawings

Fig. 1 is a sectional view of a detachable filter according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a filter element in a detachable filter according to an embodiment of the present invention.

Fig. 3 is a schematic structural view of an upper fixing plate in a filter element according to an embodiment of the present invention.

Fig. 4 is a schematic structural view of a lower fixing plate in a filter element according to an embodiment of the present invention.

The relevant elements in the figures are numbered correspondingly as follows:

100. an upper end cover; 110. a water inlet; 120. a filtrate outlet; 200. a housing; 300. a filter element; 310. an upper fixing plate; 311. a first central aperture; 312. a first peripheral aperture; 313. a first stationary tube; 314. a first handle; 320. a lower fixing plate; 321. a second central aperture; 322. a second peripheral aperture; 323. a second stationary tube; 324. a second handle; 330. a central filter screen; 340. a peripheral filter screen; 400. a lower end cover; 410. a sewage draining outlet; 420. a plugging section; 500. and (5) hooping.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" 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," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

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.

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. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The purifier of traditional technique can't effectively intercept great impurity such as branch, leaf, leads to blockking up pipeline or water pump easily to it is inconvenient to dismantle, is difficult to clear up the impurity of above-mentioned jam.

In order to solve the technical problem, the embodiment of the utility model provides a detachable filter, impurity that can effectively intercept and add, and its filter core is dismantled the washing easily. The embodiments of the present invention will be further described with reference to the accompanying drawings.

As shown in fig. 1, a sectional structure of a detachable filter according to an embodiment of the present invention is illustrated. The detachable filter comprises an upper end cover 100, a shell 200, a filter element 300 and a lower end cover 400, wherein the filter element 300 is arranged in the shell 200, the upper end cover 100 and the lower end cover 400 are respectively arranged at two ends of the shell 200, the upper end cover 100 and the lower end cover 400 are respectively detachably connected with the shell 200, and the upper end cover 100 and the lower end cover 400 jointly position the filter element 300 in the shell 200. In specific implementation, the upper end cap 100 is connected to the housing 200 through the hoop 500. The bottom cover 400 is also connected to the housing 200 by a hoop 500. The outer shape of the housing 200 is not particularly limited.

Referring to fig. 1 and 2, the filter element 300 of the present invention includes an upper fixing plate 310, a lower fixing plate 320, and a central filter screen 330 having an inner cavity and at least one peripheral filter screen 340 having an inner cavity, wherein the central filter screen 330 and the peripheral filter screen 340 are disposed between the upper fixing plate 310 and the lower fixing plate 320, and the two ends of the central filter screen 330 and the upper fixing plate 310 and the lower fixing plate 320 are detachably connected, and the two ends of the peripheral filter screen 340 and the upper fixing plate 310 and the lower fixing plate 320 are detachably connected, respectively. The number of the peripheral filter screens 340 is not limited, and in this embodiment, the number of the peripheral filter screens 340 is 4, and the peripheral filter screens 340 are uniformly distributed around the central filter screen 330.

Referring to fig. 1 and 3, the upper fixing plate 310 is provided with a first central hole 311 penetrating through the upper fixing plate 310, 4 first peripheral holes 312 penetrating through the upper fixing plate 310 are distributed around the first central hole 311, and the first central hole 311 and the first peripheral holes 312 are respectively provided with a first fixing tube 313. In the present embodiment, the aperture of the first center hole 311 and the aperture of the first peripheral hole 312 are set to be the same, but may be different.

Referring to fig. 1 and 4, the lower fixing plate 320 is provided with a second central hole 321 penetrating through the lower fixing plate 320, 4 second peripheral holes 322 penetrating through the lower fixing plate 320 are distributed around the second central hole 321, and second fixing pipes 323 are respectively arranged on the second central hole 321 and the second peripheral holes 322. In this embodiment, the aperture of the second center hole 321 and the aperture of the second peripheral hole 322 are set to be the same, but may be different.

In this embodiment, the peripheral screen 340 communicates the first peripheral hole 312 and the second peripheral hole 322 to form a peripheral filtering channel, which is also a first-stage filtering channel. The central screen 330 connects the first central hole 311 and the second central hole 321 to form a central filtering passage, which is also a second-stage filtering passage. When the number of the first peripheral holes 312, the second peripheral holes 322 and the peripheral filter screen 340 is more than 1, they constitute a plurality of peripheral filter passages connected in parallel.

Specifically, when the upper fixing plate 310, the lower fixing plate 320, the central screen 330 and the peripheral screen 340 form the filter element 300, the second central hole 321 corresponds to the first central hole 311, and the second peripheral holes 322 correspond to the first peripheral holes 312 one to one. Two ends of the central screen 330 are respectively detachably sleeved on the first fixing pipe 313 connected with the first central hole 311 and the second fixing pipe 323 connected with the second central hole 322, so that the inner cavity of the central screen 330 is communicated with the first central hole 311 and the second central hole 321. Two ends of the peripheral filter screens 340 are respectively detachably sleeved on a first fixing pipe 313 connected with a first peripheral hole 312 and a second fixing pipe 323 connected with a second peripheral hole 322, so that the inner cavity of each peripheral filter screen 340 is communicated with a group of first peripheral holes 312 and second peripheral holes 322. The number of the second peripheral holes 322 and the first peripheral holes 312 is the same, and the number is not limited to the 4 described above.

Further, the second center hole 321, the second peripheral hole 322, the first center hole 311, and the first peripheral hole 312 have the same hole diameter, and the first fixing pipe 313 and the second fixing pipe 323 have the same structure. Thus, the upper fixing plate 310 and the lower fixing plate 320 have the same structure and can be used universally. Meanwhile, the central screen 330 and the peripheral screen 340 have the same structure and can be used in common. Through the above means, the filter element 300 can be freely matched when being assembled, and has better universality. Of course, it should be noted that the upper and lower fixing plates 310 and 320 may have different structures, and the central and peripheral screens 330 and 340 may have different structures, so long as they can be combined into the filter cartridge 300 shown in fig. 2.

In this embodiment, the central filter 330 is specifically configured as a cylindrical filter, and the peripheral filter 340 is specifically configured as a cylindrical filter. The first fixing tube 313 and the second fixing tube 323 are circular tubes, respectively. The central filter screen 330 is sleeved with the first fixing pipe 313 and the second fixing pipe 323 through interference fit respectively, and detachable connection is achieved. The peripheral filter screen 340 is sleeved with the first fixing pipe 313 and the second fixing pipe 323 through interference fit respectively, and detachable connection is achieved. In other embodiments, the shapes of the central screen 330 and the peripheral screen 340 are not limited to a cylinder, and for example, the outer profile of the cross section may be a square, and the first fixing tube 313 and the second fixing tube 323 may be square tubes. For another example, the outer contour of the cross-section may also be elliptical.

The types of the central filter screen 330 and the peripheral filter screen 340 are not limited, and may be, specifically, a PP filter element, a ceramic filter element, a resin filter element, an RO reverse osmosis membrane, or the like. The center screen 330 and the peripheral screen 340 may be of the same type or different types.

As shown in fig. 1, the upper cap 100 is detachably coupled to one end of the housing 200 by a hoop 500, and the upper cap 100 is provided with a water inlet 110 and a filtrate outlet 120. After the upper end cover 100 is connected to the outer shell 200, the water inlet 110 is communicated with the inner cavity of the peripheral filter screen 340 through the first peripheral hole 312; the permeate outlet 120 is connected to the first central hole 311, and specifically, the permeate outlet 120 is inserted into the first central hole 311, on one hand, the permeate outlet 120 is communicated with an inner cavity of the central screen 330, and on the other hand, the upper end cover 100 realizes axial limiting of the filter element 300 by abutting the permeate outlet 120 and the central screen 320. Further, the permeate outlet 120 is inserted into the first fixing pipe 313 and is provided with an O-ring (not numbered) with the first fixing pipe 313.

The lower cap 400 is detachably connected to the other end of the housing 200 through a hoop 500, and the lower cap 400 is provided with a drain outlet 410 and a blocking part 420. After the lower end cover 400 is connected to the outer shell 200, the sewage draining exit 410 is communicated with the inner cavity of the peripheral filter screen 340 through the second peripheral hole 322; the plugging portion 420 is fitted into the second center hole 321 to plug the second center hole 321, and the lower end cap 400 axially limits the filter element 300 by abutting the plugging portion 420 against the center screen 320. Further, the blocking portion 420 is inserted into the second fixed pipe 323 and provided with an O-ring (not numbered) with the second fixed pipe 323.

After the upper end cap 100 and the lower end cap 400 are both connected to the housing 200, the filter element 300 is positioned in the housing 200; one end of the inner cavity of the central screen 330 of the filter element 300 is communicated with the filtrate outlet 120, the other end is closed by the lower end cap 400, and the other end is communicated with the filtrate outlet 120; the two ends of the inner cavity of the peripheral filter screen 340 of the filter element 300 are respectively communicated with the water inlet 110 of the upper end cover 100 and the sewage outlet 410 of the lower end cover 400. In this embodiment, the number of the water inlets 110 of the upper end cap 100 is one, and the water inlets are simultaneously communicated with the inner cavities of the plurality of peripheral filter screens 340. The number of the sewage discharge ports 410 of the lower end cover 400 is one, and the sewage discharge ports are simultaneously communicated with the inner cavities of the plurality of peripheral screens 340.

As shown in fig. 1, when the detachable filter is used, raw water enters the inner cavity of the peripheral filter screen 340 of the filter element 300 from the water inlet 110 of the upper end cap 100 of the filter, is filtered by the peripheral filter screen 340, then enters the inner cavity of the central filter screen 330, is secondarily filtered by the central filter screen 330, and a formed filtrate is produced from the filtrate outlet 120 of the upper end cap 100 along the inner cavity of the central filter screen 330. Impurities trapped in the inner cavity of the peripheral screen 340 may be discharged through the drain outlet 410 of the lower end cap 400. Impurities trapped in the inner cavity of the central screen 330 can be cleaned by removing the filter element 300; cleaning can also be realized by backwashing, specifically: water flow is introduced from the filtrate outlet 120 of the upper end cap 100, and impurities are introduced into the inner cavity of the peripheral filter screen 340 of the filter element 300 under the driving of the water flow and then discharged from the sewage outlet 410 of the lower end cap 400.

Above-mentioned detachable filter can realize the two-stage filtration when using, effectively intercepts great impurity in the filter screen, avoids blockking up pipeline or water pump. Meanwhile, the filter element 300 is limited by the upper end cover 100 and the lower end cover 400, no fixing structure is arranged between the filter element 300 and the shell 200, and the upper end cover 100 and the lower end cover 400 are detachably connected with the shell, so that when the filter screens are blocked seriously and need to be cleaned, the filter element 300 can be taken out from the shell 200 to be cleaned only by firstly disassembling the upper end cover 100 and the lower end cover 400, and the disassembly is convenient. In addition, the filter element 300 can be further disassembled, and the cleaning is convenient.

In some embodiments, as shown in fig. 1, a first handle 314 is disposed on a side of the upper fixing plate 310 close to the upper end cap 100 (i.e., opposite to the lower fixing plate 320). When the filter cartridge 300 is heavily clogged, the filter cartridge 300 can be removed from the housing 200 for cleaning by holding the first handle 314. It should be noted that the number of the first handle 314 may be one or more, the first handle 314 may be fixed to the upper fixing plate 310 by a fastener, or may be integrally formed with the upper fixing plate 310, and the position of the first handle 314 on the upper fixing plate 310 is not limited.

Similarly, a second handle 324 is disposed on a side of the lower fixing plate 320 close to the lower end cap 400 (i.e., opposite to the upper fixing plate 310). When the filter cartridge 300 is heavily clogged, the filter cartridge 300 can be removed from the housing 200 for cleaning by holding the second handle 324 by hand. It should be noted that the number of the second handles 324 may be one or more, and the second handles 324 may be fixed to the lower fixing plate 320 by fasteners, or may be integrally formed with the lower fixing plate 320, and the positions of the handles on the lower fixing plate 320 are not limited.

The upper fixing plate 310 and the lower fixing plate 320 may be provided with handles at the same time or alternatively. When the handles are provided on the upper fixing plate 310 and the lower fixing plate 320, as shown in fig. 1, when the filter cartridge 300 needs to be removed from the housing 200 for cleaning, the upper end cap 100 may be removed and the filter cartridge 300 may be removed from the housing 200 for cleaning by holding the first handle 314, or the lower end cap 400 may be removed and the filter cartridge 300 may be removed from the housing 200 for cleaning by holding the second handle 324.

In some embodiments, the filter apertures of central screen 330 are equal to or smaller than the filter apertures of peripheral screen 340. The raw water can be filtered by the peripheral filter screen 340 and then filtered by the central filter screen 330 for the second time, so that the large solid impurities in the raw water entering the water purifying device can be effectively removed, and the blockage of a pipeline or a water pump of the water purifying device is avoided.

An embodiment of the utility model also provides a purifier, including aforementioned arbitrary detachable filter. The water purifier further comprises a raw water pipeline, a water outlet pipeline and a water pump, wherein the raw water pipeline is connected with the water inlet 110 of the upper end cover 100, and the water outlet pipeline is communicated with the filtered liquid outlet 120 of the upper end cover 100.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A detachable filter is characterized by comprising

A housing;

a filter element, the filter element is disposed in the shell, the filter element includes central filter screen and peripheral filter screen:

the upper end cover is detachably connected with one end of the shell and is provided with a water inlet and a filtrate outlet, the water inlet is communicated with the inner cavity of the peripheral filter screen, the filtrate outlet is communicated with the inner cavity of the central filter screen, and the filtrate outlet is abutted against the filter element;

the lower end cover is detachably connected with the other end of the shell, a sewage draining outlet and a plugging portion are arranged on the lower end cover, the sewage draining outlet is communicated with the inner cavity of the peripheral filter screen, and the plugging portion is abutted against the filter element and seals the inner cavity of the central filter screen.

2. The removable filter of claim 1, wherein the top cover is secured to the housing by a hoop, and the bottom cover is secured to the housing by a hoop.

3. The removable filter of claim 1, wherein the filter cartridge further comprises:

the upper fixing plate is provided with a first central hole penetrating through the upper fixing plate, at least one first peripheral hole penetrating through the upper fixing plate is distributed around the first central hole, and first fixing pipes are respectively arranged on the first central hole and the first peripheral hole;

the lower fixing plate is provided with a second central hole penetrating through the lower fixing plate, at least one second peripheral hole penetrating through the lower fixing plate is distributed around the second central hole, the position of the second central hole corresponds to that of the first central hole, the second peripheral holes correspond to the first peripheral holes one to one, and second fixing pipes are respectively arranged on the second central hole and the second peripheral holes;

two ends of the central filter screen are respectively sleeved on a first fixed pipe arranged in the first central hole and a second fixed pipe arranged in the second central hole, and an inner cavity of the central filter screen is communicated with the first central hole and the second central hole;

the peripheral filter screen is at least provided with one filter screen and distributed around the central filter screen, two ends of the peripheral filter screen are respectively sleeved on a first fixed pipe arranged in the first peripheral hole and a second fixed pipe arranged in the second peripheral hole, and an inner cavity of the peripheral filter screen is communicated with the first peripheral hole and the second peripheral hole corresponding to the positions of the first peripheral hole and the second peripheral hole;

the water inlet is communicated with the inner cavity of the peripheral filter screen through the first peripheral hole, and the filtered liquid outlet is connected with the first central hole;

the drain outlet is communicated with the inner cavity of the peripheral filter screen through the second peripheral hole, and the plugging part is embedded into the second central hole and plugs the second central hole.

4. The removable filter of claim 3, wherein a handle is disposed on a side of the upper fixing plate facing away from the lower fixing plate, and/or a handle is disposed on a side of the lower fixing plate facing away from the upper fixing plate.

5. The removable filter of claim 3, wherein the central screen has filter apertures that are equal to or smaller than the filter apertures of the peripheral screens.

6. The removable filter of claim 3, wherein the central screen is cylindrical and the peripheral screen is cylindrical.

7. The removable filter according to claim 6, wherein the first fixed tube and the second fixed tube are identical in structure and the central screen and the peripheral screen are identical in structure.

8. The removable filter of claim 3, wherein the central screen is removably connected at each end to the first stationary tube and the second stationary tube.

9. The removable filter of claim 3, wherein the peripheral screen is removably connected at each end to the first and second stationary tubes.

10. A water purification unit, characterized in that it comprises a removable filter according to any one of claims 1-9.

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