WO2018129744A1 - Filter element assembly and water purifier provided with same - Google Patents

Abstract

A filter element assembly (100) and a water purifier provided with the same. The filter element assembly (100) comprises a filter housing (10), a joint (20), a seal cover (30), a filter element (40), and a central tube (50). A water inlet and a water outlet are formed in the joint (20). The seal cover (30) comprises a joint tube (31), a supporting plate (32), a first baffle plate (33), and a second baffle plate (34). The outer end of the joint tube (31) is connected to the joint (20). The supporting plate (32) is disposed outside the joint tube (31). The first baffle plate (33) and the second baffle plate (34) are disposed on the supporting plate (32). Limit protrusions (331) are disposed on the outer peripheral surface of the first baffle plate (33). The filter element (40) is clipped between the first baffle plate (33) and the second baffle plate (34). The central tube (50) is plugged in the joint tube (31) and communicates with the water outlet.

Description

Filter element and water purifier with same Technical field

The present invention relates to the field of water purification equipment, and more particularly to a filter element assembly and a water purifier having the same.

Background technique

The sealing of the cover on the PP cotton filter in the related art mainly adopts the method of hot melt adhesive and 704 silica gel to seal the water, avoiding the water flow and water, not only the operation efficiency is low, the production cost is high, and the hot melt adhesive, 704 silica gel The use of susceptibility, heterochromatic and volatile substances generated during use can seriously affect the user's experience. In addition, the upper cover of the PP cotton filter is prone to sloshing, resulting in a PP cotton filter end face string. The water and seals are in string water, which affects the performance of the water purifier.

Summary of the invention

The present invention aims to solve at least one of the technical problems in the related art to some extent.

To this end, the present invention proposes a filter element assembly, which has a simple structure, stable cooperation of components, reliable use, and good user experience.

The invention also proposes a water purifier having the above-described filter element assembly.

A filter cartridge assembly according to a first aspect of the present invention, a filter casing, a joint, a cover, a filter cartridge and a center tube, wherein the filter casing defines a filter chamber, and the joint is disposed on the filter casing, and the joint is a water inlet and a water outlet communicating with the filter chamber, the cover being disposed on the joint and located in the filter chamber, the cover comprising: a joint tube, a support plate, a first partition and The second partition plate is formed in a tubular shape extending along an axial direction of the filter casing, an outer end of the joint pipe is connected to the joint, and the support plate is disposed in the joint pipe An outer side of the end and extending radially outward of the filter housing, the first partition and the second partition being respectively disposed on the support plate and extending toward the filter housing, the first partition The plate and the second partition are respectively formed into a ring shape extending along a circumferential direction of the filter case, the first partition plate is coaxially disposed with the second partition plate, and the first partition plate is located at the first a peripheral surface of the second partition plate, wherein the outer peripheral surface of the first partition plate is provided with a limiting protrusion that abuts against an inner wall surface of the filter housing, the filter element In the filter chamber and is locked between the first separator and the second separator, and the central tube connector communicating with the outlet tube within the joint.

According to the filter element assembly of the embodiment of the present invention, by providing the finite-position projection on the outer peripheral surface of the first spacer, the limiting projection can be firmly pressed against the inner wall surface of the filter housing, that is, during assembly and transportation. The cover and the filter element do not move relative to the filter case, so that the matching structure of the cover and the filter case is stable and reliable, and the filter element is prevented from shaking under the condition of assembly or transportation of the filter element assembly, thereby avoiding the matching end face and the seal ring. The phenomenon of water leakage occurs at the offset of the position, which ensures the reliable connection of the components of the filter element assembly, and ensures that the filter element assembly can still work normally and effectively in special situations such as assembly and transportation. Improve the performance of the filter element assembly. The structure of the filter element assembly is simple, stable and reliable, and the user experience is good.

In addition, the filter element assembly according to the embodiment of the present invention may further have the following additional technical features:

According to an embodiment of the invention, the water inlet is provided on both sides of the joint.

According to an embodiment of the invention, the limiting protrusion comprises a plurality of the limiting protrusions arranged uniformly along the circumferential direction of the first partition.

According to an embodiment of the invention, the limiting protrusion comprises four.

According to an embodiment of the invention, the limiting projection is provided on an outer peripheral surface of the free end of the first spacer.

According to an embodiment of the invention, the inner wall surface of the filter element is in an interference fit with the outer wall surface of the second partition.

According to an embodiment of the invention, the outer wall surface of the filter element is in an interference fit with the inner wall surface of the first partition.

According to an embodiment of the invention, the axial height of the first partition is smaller than the axial height of the second partition.

According to an embodiment of the invention, the closure is an integrally formed piece.

A water purifier according to a second aspect of the present invention includes the filter element assembly described in the above embodiments.

The additional aspects and advantages of the invention will be set forth in part in the description which follows.

DRAWINGS

1 is a schematic structural view of a filter element assembly according to an embodiment of the present invention;

Figure 2 is an enlarged view of a portion A of Figure 1;

3 is a top plan view of a closure of a cartridge assembly in accordance with an embodiment of the present invention;

4 is a front elevational view of a closure of a cartridge assembly in accordance with an embodiment of the present invention.

Figure 5 is a bottom plan view of a joint of a cartridge assembly in accordance with an embodiment of the present invention;

Figure 6 is a cross-sectional view taken along line B-B of Figure 5;

Figure 7 is a schematic view showing the structure of a filter element assembly in accordance with another embodiment of the present invention.

Reference mark:

100: filter element assembly;

10: filter housing; 10a: filter chamber; 11: filter shell support rib;

20: joint; 21: main body; 22: joint connection; 23: water column.

30: cover;

31: joint pipe; 32: support plate; 33: first partition; 331: limit projection; 34: second partition;

40: filter element;

50: Central tube.

detailed description

Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

A filter element assembly according to an embodiment of the first aspect of the present invention will be specifically described below with reference to FIGS. 1 through 7.

The cartridge assembly 100 in accordance with an embodiment of the present invention includes a filter housing 10, a joint 20, a closure 30, a filter cartridge 40, and a center tube 50. Specifically, the filter housing 10 defines a filter chamber 10a. The joint 20 is disposed on the filter housing 10. The joint 20 is provided with a water inlet and a water outlet communicating with the filter chamber 10a. The cover 30 is disposed on the joint 20 and located at Filter chamber 10a.

The cover 30 includes a joint pipe 31, a support plate 32, a first partition plate 33 and a second partition plate 34. The joint pipe 31 is formed in a tubular shape extending along the axial direction of the filter casing 10, and the outer end of the joint pipe 31 is The joints 20 are connected, the support plate 32 is disposed outside the inner end of the joint pipe 31 and extends outward in the radial direction of the filter casing 10, and the first partition plate 33 and the second partition plate 34 are respectively disposed on the support plate 32 and facing the filter casing The first partition 33 and the second partition 34 are respectively formed as an annular shape extending along the circumferential direction of the filter housing 10, and the first partition 33 and the second partition 34 are coaxially disposed and the first partition 33 is located. The outer periphery of the second partition plate 34 is provided with a limiting protrusion 331 that abuts against the inner wall surface of the filter housing 10, and the filter element 40 is disposed in the filter chamber 10a and is engaged with the first partition 33. Between the second partition 34 and the second partition 34, the central tube 50 is inserted into the joint pipe 31 and communicated with the water outlet.

In other words, the filter element assembly 100 is mainly composed of a filter housing 10, a joint 20, a cover 30, a filter element 40 and a central tube 50. The inside of the filter housing 10 defines a filter chamber 10a with one end open, and the joint 20 is disposed on the filter housing 10 and Connected to the open section of the filter housing 10 to close the opening of the filter chamber 10a, the lower end of the joint 20 (up and down direction as shown in FIG. 1) has a water inlet and a water outlet communicating with the filter chamber 10a, and a joint of the joint 20 The upper end of the connecting portion 22 is connected to the filter housing 10, and the cover 30, the filter element 40 and the center tube 50 are located in the filter chamber 10a, and the center tube 50 is disposed at the center of the filter chamber 10a, and the center tube 50 is along the center of the filter housing 10. The axis extends and the lower end of the central tube 50 is inserted into the joint 20 and communicates with the water outlet on the joint 20.

Further, the cover 30 is mainly composed of a joint pipe 31, a support plate 32, a first partition plate 33, and a second partition plate 34. The joint pipe 31 is arranged in a tubular shape along the axial direction of the filter casing 10, and the joint pipe 31 is disposed. Inside the joint 20 and connected to the joint 20, the support plate 32 is disposed in the filter chamber 10a adjacent to the inner end of the joint 20, and the support plate 32 extends outward in the radial direction of the filter housing 10 along the support plate 32. The first partition 33 and the second partition 34 are radially spaced apart, that is, the first partition 33 and the second partition 34 are spaced apart in the radial direction of the support plate 32, specifically, the first partition 33 Located on the outer circumference of the support plate 32, the second partition plate 34 is located inside the support plate 32, and the first partition plate 33 and the second partition plate 34 are respectively arranged in a ring shape along the circumferential direction of the filter housing 10.

In addition, a limiting protrusion 331 is disposed on the outer peripheral surface of the first partition plate 33. When the cover 30 is assembled with the filter housing 10, the limiting protrusion 331 can stop against the inner wall surface of the filter housing 10, so that the cover is closed. The cooperation with the filter housing 10 is stable and firm, and does not affect the performance of the filter element assembly 100 even in special cases such as assembly and transportation, that is, in assembly and transportation. When the matching end face and the sealing ring in the filter element assembly 100 are not moved relatively to avoid the phenomenon of water in series, the upper end of the central tube 50 can be supported by the filter support rib 11 (as shown in FIG. 7), thereby facilitating water purification. It flows out through the center tube 50.

When the filter assembly 100 is in operation, the water flow enters the filter chamber 10a from the water inlet on the joint 20, passes through the outer side of the cover 30 to the filter element 40, continues to flow upward through the filtering action of the filter element 40, and is again filtered at the upper end of the center tube 50. The filtered water passes through the upper end of the central tube 50 into the central tube 50, flows along the central tube 50 to the water outlet, and the filtered water after a plurality of filtrations finally flows out of the filter element assembly 100 for use by the user.

Thus, according to the cartridge assembly 100 of the embodiment of the present invention, by providing the finite-position projections 331 on the outer peripheral surface of the first separator 33, the stopper projections 331 can be firmly pressed against the inner wall surface of the filter casing 10. That is, during assembly, transportation, etc., the cover 30 and the filter element 40 do not move relative to the filter housing 10, so that the mating structure of the cover 30 and the filter housing 10 is stable and reliable, preventing assembly in the filter element assembly 100 or In the case of transportation or the like, the filter element 40 is shaken, thereby avoiding the phenomenon that the end face, the seal ring and the like are offset and the water is trapped, thereby ensuring reliable connection of the components of the filter element assembly 100, and ensuring that the filter element assembly 100 is still in special conditions such as assembly and transportation. It can work normally and effectively, improving the performance of the filter element assembly 100. The filter cartridge assembly 100 has a simple structure, is stable, reliable, and has a good user experience.

Referring to FIG. 5 and FIG. 6, it is to be noted that the joint 20 is provided with a main body portion 21, a joint connecting portion 22 and a water dividing column 23, and the joint connecting portion 22 is provided at the upper end of the main body portion 21 and connected to the filter housing 10, and the water dividing column 23 is connected to the main body portion 21 and at least partially spaced apart from the inner wall surface of the main body portion 21, and the joint 20 is provided with a water inlet and a water outlet communicating with the filter chamber 10a, wherein the outer wall surface of the water dividing column 23 and the main body portion 21 The inner wall faces are spaced apart so as to define a water inlet passage that is electrically connected to the water inlet between the outer wall surface of the water dividing column 23 and the inner wall surface of the main body portion 21.

Optionally, the water inlet is provided on both sides of the joint 20.

Specifically, as shown in FIG. 1, the water supply port is respectively disposed on both sides of the joint 20, and the water flow enters the filter chamber 10a from the water inlets on both sides of the joint 20, and is filtered by the filter core 40, and then flows along the center tube 50. Finally, the water outlet that communicates with the central pipe 50 is reached and the filter element assembly 100 is discharged. Water is introduced through the water inlets on both sides of the joint 20. For the same flow of water, the water can be filtered through both sides of the filter element 40 to ensure a more filtering process. Uniform and sufficient, the filtered water is cleaner and the filtration efficiency of the filter assembly 100 is increased.

In some embodiments of the present invention, the limiting protrusions 331 include a plurality of, and the plurality of limiting protrusions 331 are evenly spaced along the circumferential direction of the first partition plate 33.

That is, a plurality of limiting protrusions 331 are disposed on the outer circumferential surface of the first spacer 33, and the plurality of limiting protrusions 331 may be evenly spaced apart in the circumferential direction of the outer periphery of the first spacer 33. That is, a plurality of equally spaced limiting protrusions 331 are arranged in the outer circumferential direction of the first partition plate 33, and the plurality of limiting protrusions 331 cooperate with the inner wall of the filter housing 10 in the circumferential direction of the filter housing 10, and a plurality of The limiting protrusion 331 abuts against the inner wall of the filter housing 10 along the circumferential direction of the filter housing 10, so that the outer circumference of the first partition 33 and the inner wall of the filter housing 10 are stably and reliably matched in the circumferential direction of the filter housing 10. , the components will not be in the circumference of the filter housing 10 Shakes anywhere in the up direction.

As shown in FIG. 3, in the embodiment, the limiting protrusions 331 include four.

Specifically, four limiting protrusions 331 are disposed on the outer circumferential surface of the first partition plate 33, and the four limiting protrusions 331 are evenly spaced apart in the circumferential direction of the outer circumference of the first partition plate 33, that is, Four equally spaced limiting protrusions 331 are arranged on the outer circumference of the first partition plate 33. The four limiting protrusions 331 cooperate with the inner wall of the filter housing 10 in the circumferential direction of the filter housing 10, and four limit projections The 331 is abutted against the inner wall of the filter housing 10 along the circumferential direction of the filter housing 10, so that the outer circumference of the first partition plate 33 and the inner wall of the filter housing 10 are stably and reliably matched in the circumferential direction of the filter housing 10, first The four limiting protrusions 331 of the partition 33 stop against the inner wall of the filter housing 10 along the circumferential direction of the filter housing 10, ensuring that no sway occurs in the circumferential direction of the filter housing 10, and four limit projections The position of the 331 is symmetrical with respect to the center of the first partition 33, and the appearance is beautiful.

Advantageously, the limiting projection 331 is provided on the outer peripheral surface of the free end of the first partition 33.

Specifically, as shown in FIGS. 2 and 4, the cover 30 is disposed in the filter chamber 10a and extends in the axial direction of the filter housing 10 (up and down direction as shown in FIG. 2), and one of the support plates 32 of the cover 30 The side (upper side as shown in FIG. 2) surface is provided with a first partition 33 and a second partition 34 which are spaced apart in the radial direction of the filter housing 10, that is, the first partition 33 and the second partition 34 The lower end is respectively connected to the upper surface of the support plate 32, and the free end of the first partition plate 33 is the upper end shown in FIG. 2, and the outer peripheral surface of the first partition plate 33 is provided with a finite position protrusion 331, and the limit protrusion 331 is adjacent to Free end setting.

Thereby, the limiting protrusion 331 is disposed on the outer circumference of the free end of the first partition plate 33, which is advantageous for forming a water flow passage between the adjacent two limiting protrusions 331 when the inner wall of the filter housing 10 is stopped. The stable cooperation of the cover 30 and the filter housing 10 can be achieved, the filter assembly 100 can be assembled, and the flow of water inside the filter assembly 100 can be ensured to ensure the normal operation of the filter assembly 100.

Advantageously, the inner wall surface of the filter element 40 is in an interference fit with the outer wall surface of the second diaphragm 34, i.e., the radial dimension of the inner wall of the filter element 40 is smaller than the radial dimension of the outer wall of the second diaphragm 34, through the inner wall surface of the filter element 40 and The outer wall surface of the second baffle 34 has an interference fit, and the structure of the filter element 40 and the second baffle 34 is simple, the process is convenient, and the inner wall surface of the filter element 40 and the outer wall surface of the second baffle 34 are effectively ensured. The sealing property between the filter element 40 and the second partition plate 34 is prevented to prevent water from colliding.

Preferably, the outer wall surface of the filter element 40 has an interference fit with the inner wall surface of the first partition plate 33, that is, the radial dimension of the outer wall of the filter element 40 is larger than the radial dimension of the inner wall of the first partition plate 33, and the outer wall surface of the filter element 40 passes through The inner wall surface of the first partition plate 33 has an interference fit, and the structure of the filter element 40 and the first partition plate 33 is simple, the processing is convenient, and the outer wall surface of the filter element 40 and the inner wall surface of the first partition plate 33 are effectively ensured. The sealing property between the filter element 40 and the first partition plate 33 is prevented to prevent the occurrence of water leakage.

The axial height of the first partition plate 33 is smaller than the axial height of the second partition plate 34. Specifically, as shown in FIGS. 1 and 2, the height of the second partition plate 34 in the axial direction of the filter element 40 is greater than the height of the first partition plate 33 in the axial direction of the filter element 40, so that not only the second partition can be enlarged. The interference fit area of the plate 34 and the inner wall surface of the filter element 40 ensures the outer wall of the second partition 34 The effective sealing between the inner wall of the filter element 40 and the inner wall of the filter element 40 also facilitates that the filter element 40 is firmly engaged in the cover 30 to ensure structural stability and the connection is very reliable.

Preferably, the cover 30 is an integrally formed piece, whereby the integrally formed structure not only ensures the structure and performance stability of the filter element assembly 100, but also facilitates molding and manufacturing, and eliminates redundant fittings and connection processes. The assembly efficiency of the filter element assembly 100 is greatly improved, and the connection reliability of the filter element assembly 100 is ensured. Furthermore, the overall structure and stability of the integrally formed structure are high, the assembly is more convenient, and the service life is longer.

The filter element assembly 100 of the embodiment of the present invention will be described below in conjunction with specific embodiments.

As shown in FIGS. 1 to 7, a cartridge assembly 100 according to an embodiment of the present invention includes a filter housing 10, a joint 20, a cover 30, a filter cartridge 40, and a center tube 50, wherein the cover 30 includes a joint tube 31 and a support plate 32. The first partition 33 and the second partition 34.

Specifically, the filter housing 10 defines a filter chamber 10a, and the joint 20 is located at one end of the filter housing 10 (such as the lower end of the filter housing 10 shown in FIG. 1) and is connected to the filter housing 10, and is respectively disposed on both sides of the joint 20. There is a water inlet, the cover 30, the filter element 40 and the central tube 50 are respectively located in the filter chamber 10a, the cover 30 is disposed at the upper end of the joint 20, the joint tube 31 of the cover 30 is inserted into the joint 20, and the support of the cover 30 The plate 32 extends outward in the radial direction of the filter housing 10, and the first partition plate 33 and the second partition plate 34 are respectively disposed annularly along the circumferential direction of the filter housing 10, and the first partition plate 33 and the second partition plate 34 are The support plates 32 are radially spaced apart, and the first partition 33 is located outside the second partitions 34.

Further, the outer peripheral surface of the first partition plate 33 of the support plate 32 is further provided with a finite position protrusion 331, and the four limiting protrusions 331 are evenly spaced along the circumferential direction of the first partition plate 33, and the limit convex is arranged. The 331 is located on the outer peripheral surface of the free end of the first partition plate 33, and the four limiting protrusions 331 can stop against the inner wall surface of the filter housing 10 in the circumferential direction of the filter housing 10, and the first partition plate 33 and the second partition plate 34 is respectively subjected to an interference fit with the filter element 40. Further, the filter element 40 extends in a vertical direction to form a columnar shape, and the filter element 40 is formed in a ring shape along the circumferential direction of the filter case 10, and the center tube 50 is located at the center of the filter case 10 and extends along the axial direction of the filter case 10 and It is in communication with the water outlet of the joint 20.

It should be noted that the filter element assembly 100 further includes a sealing ring (not shown), and the sealing ring is sleeved on the central tube 50 and is respectively sealingly connected with the central tube 50 and the joint 20, and the inner wall of the joint 20 is provided with an inward depression. The groove and the sealing ring are disposed in the groove. In addition, the filter cartridge assembly 100 further includes a limiting core, the limiting core is disposed in the joint and at least a portion extends into the recess to press the sealing ring into the recess, and the limiting core is connected to the joint by ultrasonic welding.

A water purifier (not shown) according to an embodiment of the second aspect of the present invention, including the filter element assembly 100 of the above embodiment, since the cartridge assembly 100 according to the above embodiment of the present invention has the above-described technical effects, according to an embodiment of the present invention The water purifier also has the corresponding technical effect, that is, the water purifier has a simple structure, stable and reliable, good sealing performance and good user experience.

Specifically, by providing the finite-position protrusions 331 on the outer peripheral surface of the first partition plate 33 of the filter element assembly 100 of the water purifier, the limiting protrusions 331 can be firmly pressed against the inner wall surface of the filter housing 10, that is, In the process of assembly, transportation, etc., the cover 30 And the filter element 40 does not move relative to the filter housing 10, so that the mating structure of the cover 30 and the filter housing 10 is stable and reliable, preventing the filter element 40 from swaying in the case of assembly or transportation of the filter element assembly 100, thereby avoiding the mating end face. The phenomenon of water leakage occurs at the position of the seal ring, etc., ensuring reliable connection of the components of the filter element assembly 100, ensuring that the filter element assembly 100 can still work normally and effectively in special situations such as assembly and transportation, and improving the use of the filter element assembly 100. Performance, which improves the quality of the water purifier and enhances the user experience.

Other configurations and operations of the cartridge assembly 100 and the water purifier having the same according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " After, "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship of the "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplified description, and does not indicate or imply the indicated device or component. It must be constructed and operated in a particular orientation, and is not to be construed as limiting the invention.

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

In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. Or in one piece; it may be a mechanical connection, or it may be an electrical connection or a communication with each other; it may be directly connected or indirectly connected through an intermediate medium, and may be an internal connection of two elements or an interaction relationship between two elements. Unless otherwise expressly defined. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, various embodiments or examples described in the specification, as well as features of various embodiments or examples, may be combined and combined.

Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims (10)

A filter cartridge assembly, comprising: a filter housing, wherein the filter housing defines a filter chamber; a joint, the joint is disposed on the filter housing, and the joint is provided with a water inlet and a water outlet communicating with the filter chamber; a cover, the cover is disposed on the joint and located in the filter cavity, and the cover comprises: a joint pipe formed as a tubular shape extending in an axial direction of the filter casing, the outer end of the joint pipe being connected to the joint; a support plate disposed outside the inner end of the joint tube and extending outward in a radial direction of the filter housing; a first partition and a second partition, wherein the first partition and the second partition are respectively disposed on the support plate and extend toward the filter housing, the first partition and the partition The second partitions are respectively formed into a ring shape extending along a circumferential direction of the filter housing, the first partition plate is disposed coaxially with the second partition plate, and the first partition plate is located at the second partition plate a peripheral portion, the outer peripheral surface of the first partition plate is provided with a limiting protrusion that abuts against an inner wall surface of the filter housing; a filter element, the filter element is disposed in the filter chamber and is caught between the first partition plate and the second partition plate; a central tube that is inserted into the joint tube and communicates with the water outlet. The cartridge assembly of claim 1 wherein said water inlet is provided on either side of said joint. The cartridge assembly according to claim 3, wherein said limiting projection comprises a plurality of said limiting projections being evenly spaced apart along a circumference of said first spacer. The cartridge assembly of claim 3 wherein said limit projections comprise four. A cartridge assembly according to claim 1, wherein said limiting projection is provided on an outer peripheral surface of the free end of said first spacer. The cartridge assembly of claim 1 wherein the inner wall surface of the filter element is in an interference fit with the outer wall surface of the second diaphragm. The cartridge assembly of claim 1 wherein the outer wall surface of the filter element is in an interference fit with the inner wall surface of the first diaphragm. The cartridge assembly of claim 1 wherein said first diaphragm has an axial height that is less than an axial height of said second diaphragm. The filter cartridge assembly of claim 1 wherein said closure is an integrally formed piece. A water purifier comprising the filter cartridge assembly of any of claims 1-9.

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