CN211226615U - Filter element assembly and ultrafiltration water purifier - Google Patents

Abstract

The utility model relates to a filter element group spare and ultrafiltration water purifier, filter element group spare, including filter flask, one-level filter core and second grade filter core, the one-level filter core with the second grade filter core is all installed in the filter flask, the one-level filter core is the tubular structure, just the aperture of tubular structure reduces to the direction that is close to the middle part by both ends gradually, the second grade filter core is inserted and is established in the one-level filter core, get into hydroenergy in the filter flask enough by the one-level filter core with discharge after the second grade filter core filters. Integrate one-level filter core and second grade filter core in the filter flask, and will the one-level filter core sets up to the tubular structure, then installs the second grade filter core in the one-level filter core, thereby reduce the volume of filter element group spare. Specifically, the bore diameter of the cylindrical structure is gradually reduced from both ends toward the direction near the middle. Thereby increase in the limited space in the filter flask the filter area of one-level filter core promotes the filter effect.

Description

Filter element assembly and ultrafiltration water purifier

Technical Field

The utility model relates to a water purification field especially relates to a filter element group spare and ultrafiltration water purifier.

Background

At present, in order to reduce the structural size of the water purifier, a multi-stage filter element is integrated in a filter bottle. However, under the condition of increasing requirements on size limitation, the space in the filter bottle is limited, and the higher the integration level of the composite filter element is, the smaller the space which can be temporarily used by each stage of filter element is. And the undersize of each stage of filter element can generate negative influence on the water purification effect. Therefore, how to ensure the filtering effect under the condition of meeting the requirement of high integration level is very important.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide a filter element assembly and an ultrafiltration water purifier, which can improve the filtration effect while satisfying high integration.

The utility model provides a filter element group spare, includes filter flask, one-level filter core and second grade filter core, the one-level filter core with the second grade filter core is all installed in the filter flask, the one-level filter core is the tubular structure, just the aperture of tubular structure is by both ends to reducing gradually in the direction that is close to the middle part, the second grade filter core is inserted and is established in the one-level filter core, get into hydroenergy in the filter flask can by the one-level filter core with the second grade filter core filters the back and discharges.

Above-mentioned scheme provides a filter element group spare, is in one-level filter core and second grade filter core integration in the filter flask, and will the one-level filter core sets up to the tubular structure, the aperture gradual change of tubular structure, then install the second grade filter core in the one-level filter core, thereby reduce the volume of filter element group spare. Specifically, the aperture of the primary filter element is gradually reduced from two ends to the direction close to the middle part. Thereby increase in the limited space in the filter flask the filter area of one-level filter core promotes the filter effect.

In one embodiment, the primary filter element and the secondary filter element are both arranged along the axial direction of the filter flask, the primary filter element and the side wall of the filter flask are arranged at intervals to form a first filtering gap, the water inlet of the filter flask is communicated with the first filtering gap, and the water outlet of the secondary filter element is communicated with the water outlet of the filter flask.

In one embodiment, the filter element assembly further comprises a support ring and a first support cover, the water inlet of the filter bottle is arranged on the top wall of the filter bottle, the first-stage filter element is close to one end of the top wall and connected or abutted to the outer edge of the support ring, the support ring is arranged in the axial direction of the filter bottle and arranged at intervals with the top wall of the filter bottle, the inner ring of the support ring is connected with the second-stage filter element in a sealing manner, the outer ring of the support ring is arranged at intervals with the side wall of the filter bottle, the first-stage filter element is far away from one end of the top wall and connected or abutted to the first support cover, and the outer ring of the first support cover is connected with the side wall of the filter.

In one embodiment, the first support cover is provided with a disassembly hole, the bottom end of the filter bottle is provided with a bottle cap, the bottle cap is detachably connected with the side wall of the filter bottle, one end of the secondary filter element is detachably connected with the top wall of the filter bottle, and the other end of the secondary filter element penetrates through the disassembly hole to be connected with or abutted to the bottle cap.

In one embodiment, a sealing ring is arranged between the secondary filter element and the side wall of the dismounting hole.

In one embodiment, the first support cover is provided with an extension cylinder on the surface opposite to the bottle cap, the diameter of the extension cylinder is the same as that of the disassembly hole, one end of the extension cylinder far away from the first support cover is abutted to the bottle cap, and the secondary filter element sequentially penetrates through the disassembly hole and the extension cylinder to be connected or abutted to the bottle cap.

In one embodiment, the primary filter element is cylindrical, and the filtering surface of the primary filter element is an arc surface which is gradually concaved inwards from two ends to the middle part.

In one embodiment, a water outlet joint assembly is arranged in the filter bottle and arranged between the secondary filter element and the top wall of the filter bottle, a water outlet passage is arranged in the water outlet joint assembly, one end of the water outlet passage is communicated with a water production port of the secondary filter element, the other end of the water outlet passage is positioned in the water inlet, and the water outlet joint assembly and the side wall of the water inlet are arranged at intervals to form a water inlet gap communicated with the first filtering gap.

In one embodiment, the water outlet joint component comprises a fixed cylinder, a movable cylinder and an elastic resetting piece, one end of the fixed cylinder is communicated with the water producing port of the secondary filter element, the other end of the fixed cylinder extends into the water inlet, the hollow space of the fixed cylinder forms the water outlet passage, the elastic reset piece is sleeved outside the fixed cylinder, the movable cylinder is sleeved outside the elastic reset piece, the movable cylinder and the side wall of the water inlet are arranged at intervals to form the water inlet gap, the bottom end of the elastic reset piece is abutted against the secondary filter element, the top end of the elastic reset piece is abutted against the movable cylinder, the outer ring of the movable cylinder is provided with a sealing position, the diameter of the sealing position is larger than that of the water inlet, the elastic reset piece can enable the moving cylinder to be axially abutted against the sealing position to seal the water inlet.

In one embodiment, the filter element assembly further comprises a middle cylinder and a second supporting cover, the second supporting cover is disposed in the space between the supporting ring and the top wall of the filter bottle, the second supporting cover is connected with the water producing end of the second-stage filter element, a through hole is formed in the second supporting cover, the hole wall of the through hole extends in the direction close to the top wall of the filter element to form an auxiliary cylinder, the middle cylinder is sleeved outside the elastic resetting member, the top end of the elastic resetting member is abutted against the middle cylinder, one end of the middle cylinder close to the second-stage filter element is inserted in the auxiliary cylinder, the middle cylinder and the auxiliary cylinder can move relatively in the axial direction, one end of the moving cylinder close to the supporting ring is sleeved outside the auxiliary cylinder, the moving cylinder and the auxiliary cylinder can move relatively in the axial direction, one end of the moving cylinder far away from the supporting ring is sleeved outside the middle cylinder, and the outer wall of the middle cylinder is provided with a shoulder, and when the elastic reset pushes the middle cylinder to the direction far away from the secondary filter element, the shoulder pushes the movable cylinder to the direction far away from the secondary filter element.

In one embodiment, the primary filter element comprises a melt-blown PP cotton filter element or a polypropylene activated carbon fiber filter element.

In one embodiment, the secondary filter element is an ultrafiltration membrane filter element.

An ultrafiltration water purifier comprises the filter element assembly.

The above scheme provides an ultrafiltration water purifier, through adopting the filter element subassembly described in any above embodiment with one-level filter core and second grade filter core integration in the filter flask to improve ultrafiltration water purifier's integrated level. And when improving the integrated level, will the one-level filter core sets up to the tubular structure, and the aperture reduces gradually in the direction that is close to the middle part by both ends to increased in limited space the filter area of one-level filter core promotes the filter effect.

Drawings

FIG. 1 is a cross-sectional view of a filter cartridge assembly according to the present embodiment;

FIG. 2 is a cross-sectional view of the filter cartridge assembly in another embodiment;

fig. 3 is an enlarged view of a portion of the filter cartridge assembly shown in fig. 2 at a.

Description of reference numerals:

10. a filter element assembly; 11. a filter flask; 111. a bottle cap; 12. a first-stage filter element; 121. a first filter gap; 13. a secondary filter element; 14. a support ring; 15. a first support cover; 151. an extension cylinder; 16. a water outlet joint assembly; 161. a water outlet passage; 162. a water inlet gap; 163. a fixed cylinder; 164. moving the drum; 165. an elastic reset member; 166. an intermediate barrel; 167. a second support cover; 20. a water inlet; 30. and (7) a water outlet.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention can be embodied in many different forms other than those specifically described herein, and it will be apparent to those skilled in the art that similar modifications can be made without departing from the spirit and scope of the invention, and it is therefore not to be limited to the specific embodiments disclosed below.

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 filter cartridge assembly 10 is provided that includes a filter flask 11, a primary filter element 12, and a secondary filter element 13, the primary filter element 12 and the secondary filter element 13 each being mounted in the filter flask 11.

The primary filter element 12 is a cylindrical structure, and the aperture of the cylindrical structure is gradually reduced from two ends to the direction close to the middle part. Specifically, as shown in fig. 1 and 2, the cross section of the primary filter element 12 taken by the cross-axial section is arc-shaped. Or the section of the primary filter element 12, which is cut by the cross section passing through the axis, is a fold line shape with a corner.

For example, in one embodiment, as shown in fig. 1 and 2, the primary filter element 12 is cylindrical, and the filtering surface of the primary filter element 12 is an arc surface that is gradually concave from two ends to the middle.

Further, the second-stage filter element 13 is inserted into the first-stage filter element 12, and water entering the filter flask 11 can be discharged after being filtered by the first-stage filter element 12 and the second-stage filter element 13.

The filter element group spare 10 that above-mentioned scheme provided is integrated with one-level filter core 12 and second grade filter core 13 in filter flask 11, and will one-level filter core 12 sets up to the tubular structure, the aperture of tubular structure changes gradually, then installs second grade filter core 13 in the one-level filter core 12, thereby reduces filter element group spare 10's volume. Specifically, the aperture of the primary filter element 12 gradually decreases from the two ends to the direction near the middle. Therefore, the filtering area of the primary filter element 12 is increased in the limited space in the filter bottle 11, and the filtering effect is improved.

Specifically, the water entering the filter flask 11 may be filtered by the first-stage filter element 12 and then filtered by the second-stage filter element 13, or filtered by the second-stage filter element 13 and then filtered by the first-stage filter element 12, which is not limited herein.

And, the first-stage filter element 12 with the second grade filter element 13 all can integrate multistage filter element, for example the first-stage filter element 12 can be formed by multistage filter element from inside to outside in proper order after range upon range of cover establishes.

Further, as shown in fig. 1 and 2, in one embodiment, the primary filter element 12 and the secondary filter element 13 are both disposed along the axial direction of the filter flask 11, and the primary filter element 12 is disposed at a distance from the sidewall of the filter flask 11 to form a first filter gap 121. The water inlet 20 of the filter flask 11 is communicated with the first filtering gap 121, and the water producing port of the secondary filter element 13 is communicated with the water outlet 30 of the filter flask 11.

The water entering from the water inlet 20 of the filter flask 11 reaches the first filtering gap 121, and then flows out from the water outlet 30 of the filter flask 11 after being sequentially filtered by the primary filter element 12 and the secondary filter element 13.

Moreover, based on the aperture of the first-stage filter element 12 gradually decreasing in the direction close to the middle, that is, as shown in fig. 1 and fig. 2, the first-stage filter element 12 is approximately in an up-down symmetrical structure, that is, the sizes of the two ends of the first-stage filter element 12 are the same, so that the two ends of the first-stage filter element 12 do not need to be distinguished during installation, and the installation convenience is improved. Especially, when including support ring 14 and first support cover 15 in the filter element subassembly 10, based on the size at one-level filter core 12 both ends is unanimous, all can with support ring 14 and first support cover 15 correspond the setting to accelerate the packaging efficiency, promote the convenience of installation.

Further, based on the first filtering gap 121 is formed by the interval between the primary filter element 12 and the sidewall of the filter bottle 11, it can be seen that the space of the first filtering gap 121 near the middle of the primary filter element 12 is larger, so that the water entering the first filtering gap 121 from the water inlet 20 is smoother in the first filtering gap 121, and the filtering efficiency is higher.

Specifically, the primary filter element 12 may be a melt-blown PP cotton filter element or a polypropylene activated carbon fiber filter element.

And the secondary filter element 13 may be an ultrafiltration membrane filter element. When the secondary filter element 13 is the ultrafiltration membrane filter element, the secondary filter element 13 can be set to be detachable, so that the secondary filter element 13 can be taken out for cleaning.

Further, as shown in fig. 1 and 2, in one embodiment, the cartridge assembly 10 further includes a support ring 14 and a first support cover 15. The water inlet 20 of filter flask 11 sets up the roof of filter flask 11, be close to on the one-level filter core 12 the one end of roof with the outer fringe of support ring 14 is connected or the butt, support ring 14 is in filter flask 11 the axial with the roof interval of filter flask 11 sets up, the inner circle of support ring 14 with second grade filter core 13 sealing connection, the outer lane of support ring 14 with the lateral wall interval of filter flask 11 sets up. One end of the first-stage filter element 12, which is far away from the top wall, is connected with or abutted against the first support cover 15, and the outer ring of the first support cover 15 is connected with the side wall of the filter flask 11 in a sealing manner.

The water entering from the water inlet 20 flows into the first filtering gap 121 from the gap between the support ring 14 and the top wall of the filter flask 11, and the water entering into the first filtering gap 121 can enter the space surrounded by the primary filter element 12 and be filtered by the secondary filter element 13 only after being filtered by the primary filter element 12 due to the sealing connection between the outer ring of the first support cover 15 and the side wall of the filter flask 11. Therefore, the support ring 14 and the first support cover 15 are arranged to ensure the normal operation of the water purifying process of the filter element.

Moreover, as mentioned above, based on the aperture of the two ends of the primary filter element 12 being substantially the same, the two ends of the primary filter element 12 can be disposed corresponding to the support ring 14 and the first support cover 15, so as to improve the convenience of installation.

Further, in an embodiment, as shown in fig. 1 and fig. 2, a detachment hole is formed in the first support cover 15, a bottle cover 111 is arranged at the bottom end of the filter flask 11, the bottle cover 111 is detachably connected with a side wall of the filter flask 11, one end of the secondary filter element 13 is detachably connected with a top wall of the filter flask 11, and the other end of the secondary filter element 13 penetrates through the detachment hole to be connected with or abutted to the bottle cover 111.

Therefore, after the filter flask is used for a period of time, the bottle cap 111 can be detached, and then the secondary filter element 13 is taken out of the filter flask 11 for cleaning, so that the service life is prolonged. Specifically, the secondary filter element 13 and the top cover of the filter flask 11 may be detachably fastened, or may be in a threaded connection. When the secondary filter element 13 needs to be detached for cleaning, the secondary filter element 13 is firstly separated from the top wall of the filter bottle 11 by means of rotation and the like, and then the secondary filter element 13 is pulled out of the detaching hole.

Further, in order to improve the sealing performance between the secondary filter element 13 and the side wall of the dismounting hole, in one embodiment, a sealing ring is arranged between the secondary filter element 13 and the side wall of the dismounting hole.

Further, in an embodiment, as shown in fig. 1 and fig. 2, an extension cylinder 151 is disposed on a surface of the first support cover 15 opposite to the bottle cap 111, an aperture of the extension cylinder 151 is the same as an aperture of the removal hole, an end of the extension cylinder 151 away from the first support cover 15 abuts against the bottle cap 111, and the secondary filter element 13 sequentially passes through the removal hole and the extension cylinder 151 to be connected or abutted against the bottle cap 111.

The extension cylinder 151 is disposed such that a distance between the first support cover 15 and the bottle cap 111 is controlled, or the bottle cap 111 can provide a supporting force to the first support cover 15 in an axial direction after the bottle cap 111 is mounted in place, thereby ensuring that both ends of the primary filter element 12 can be reliably assembled with the support ring 14 and the first support cover 15, and thus ensuring the sealing property of the first filter gap 121.

Specifically, in one embodiment, as shown in fig. 1, the water inlet 20 and the water outlet 30 of the filter flask 11 are two openings respectively disposed on the top wall of the filter flask 11.

Alternatively, as shown in fig. 2, the outlet connector assembly 16 is disposed such that the outlet 30 and the inlet 20 of the filter bottle 11 can be coaxially sleeved.

For example, in one embodiment, as shown in fig. 2 and 3, a water outlet joint assembly 16 is disposed in the filter bottle 11, the water outlet joint assembly 16 is disposed between the secondary filter element 13 and the top wall of the filter bottle 11, a water outlet passage 161 is disposed in the water outlet joint assembly 16, one end of the water outlet passage 161 is communicated with the water producing port of the secondary filter element 13, the other end of the water outlet passage 161 is located in the water inlet 20, and the water outlet joint assembly 16 is spaced from the side wall of the water inlet 20 to form a water inlet gap 162 communicated with the first filter gap 121.

Namely, the water outlet passage 161 formed in the water outlet joint assembly 16 enables pure water formed at the water outlet of the secondary filter element 13 to be conducted out, and the gap between the water outlet joint assembly 16 and the side wall of the water inlet 20 is used for removing the raw water. When purifying water, raw water enters the first filtering gap 121 from the water inlet gap 162 formed between the side wall of the water inlet 20 and the water outlet joint assembly 16.

Further, as shown in fig. 3, in an embodiment, the water outlet joint assembly 16 includes a fixed cylinder 163, a movable cylinder 164, and an elastic resetting member 165, one end of the fixed cylinder 163 is communicated with the water producing port of the secondary filter element 13, the other end of the fixed cylinder 163 extends into the water inlet 20, a hollow space of the fixed cylinder 163 forms the water outlet passage 161, the elastic resetting member 165 is sleeved outside the fixed cylinder 163, the movable cylinder 164 is sleeved outside the elastic resetting member 165, the movable cylinder 164 and a side wall of the water inlet 20 are arranged at an interval to form the water inlet gap 162, a bottom end of the elastic resetting member 165 abuts against the secondary filter element 13, a top end of the elastic resetting member 165 abuts against the movable cylinder 164, an outer ring of the movable cylinder 164 is provided with a sealing position, and a diameter of the sealing position is larger than a diameter of the water inlet 20, the elastic reset piece 165 can axially press the moving cylinder 164 to the sealing position to seal the water inlet 20.

When filter element group spare 10 and water pipe intercommunication back, remove a section of thick bamboo 164 and receive external effort, overcome elasticity resets 165's elastic force, and to being close to the direction of second grade filter core 13 removes, thereby makes water inlet gap 162 switches on, makes the raw water can be followed water inlet gap 162 flows in the first filter gap 121, carries out filtering process. When the filter core needs to be replaced, the water pipe is detached from the filter core component 10, the movable barrel 164 is moved in the direction away from the secondary filter core 13 under the pressing action of the elastic resetting piece 165, so that the movable barrel 164 is moved to the side wall contact of the sealing position and the water inlet 20, and the water inlet gap 162 is separated to achieve the effect of preventing water leakage. The convenience of replacing the filter element is improved.

Specifically, the elastic restoring member 165 may directly abut against the moving cylinder 164, or may indirectly abut against the moving cylinder via an intermediate member.

For example, in one embodiment, as shown in fig. 2 and 3, the filter cartridge assembly 10 further includes an intermediate cartridge 166 and a second support cover 167. The second support cover 167 is disposed in the space between the support ring 14 and the top wall of the filter flask 11, the second support cover 167 is connected to the water producing end of the second-stage filter element 13, the second support cover 167 is provided with a through hole, the through hole wall extends in a direction close to the top wall of the filter element to form an auxiliary cylinder, the middle cylinder 166 is sleeved outside the elastic reset element 165, the top end of the elastic reset element 165 is abutted to the middle cylinder 166, one end of the middle cylinder 166 close to the second-stage filter element 13 is inserted in the auxiliary cylinder, the middle cylinder 166 and the auxiliary cylinder can move relatively in the axial direction, one end of the movable cylinder 164 close to the support ring 14 is sleeved outside the auxiliary cylinder, the movable cylinder 164 and the auxiliary cylinder can move relatively in the axial direction, one end of the movable cylinder 164 far from the support ring 14 is sleeved outside the middle cylinder 166, and the outer wall of the middle cylinder 166 is provided with a shoulder, when the elastic reset pushes the middle cylinder 166 away from the secondary filter element 13, the shoulder pushes the moving cylinder 164 away from the secondary filter element 13.

When filter element group spare 10 is unpack apart with the water pipe, elasticity resets 165 through to keeping away from the direction of second grade filter core 13 supports and presses middle section of thick bamboo 166, thereby through the shoulder of middle section of thick bamboo 166 is indirect will remove section of thick bamboo 164 and pass, make sealed position with the lateral wall contact of water inlet 20 realizes blocking of intake clearance 162, thereby when avoiding changing the filter element, the condition that water leaked in the filter element group spare 10 takes place.

Further, in another embodiment, an ultrafiltration water purifier is provided, comprising the above-mentioned filter cartridge assembly 10.

The above-mentioned scheme provides an ultrafiltration water purifier, through adopting the filter element assembly 10 described in any one of the above-mentioned embodiments to integrate the primary filter element 12 and the secondary filter element 13 in the filter flask 11, thereby improving the integration level of the ultrafiltration water purifier. And when improving the integrated level, will one-level filter core 12 sets up to the tubular structure, and the aperture reduces gradually in the direction that is close to the middle part by both ends to increased in limited space the filter area of one-level filter core 12 promotes the filter effect.

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 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 (13)

1. The utility model provides a filter element group spare, its characterized in that, includes filter flask, one-level filter core and second grade filter core, the one-level filter core with the second grade filter core is all installed in the filter flask, the one-level filter core is the tubular structure, just the aperture of tubular structure reduces gradually in the direction by both ends to being close to the middle part, the second grade filter core is inserted and is established in the one-level filter core, get into hydroenergy in the filter flask can by the one-level filter core with the second grade filter core filters the back discharge.

2. The filter element assembly of claim 1, wherein the primary filter element and the secondary filter element are both arranged along an axial direction of the filter flask, the primary filter element and a side wall of the filter flask are arranged at intervals to form a first filtering gap, a water inlet of the filter flask is communicated with the first filtering gap, and a water outlet of the secondary filter element is communicated with a water outlet of the filter flask.

3. The filter element assembly of claim 2, further comprising a support ring and a first support cover, wherein the water inlet of the filter flask is disposed on the top wall of the filter flask, one end of the primary filter element close to the top wall is connected or abutted to the outer edge of the support ring, the support ring is disposed in the axial direction of the filter flask and spaced from the top wall of the filter flask, the inner ring of the support ring is connected with the secondary filter element in a sealing manner, the outer ring of the support ring is disposed in the spaced manner from the side wall of the filter flask, one end of the primary filter element far away from the top wall is connected or abutted to the first support cover, and the outer ring of the first support cover is connected with the side wall of the filter flask in a sealing manner.

4. The filter element assembly of claim 3, wherein the first support cover is provided with a detachment hole, the bottom end of the filter flask is provided with a flask cover, the flask cover is detachably connected with the side wall of the filter flask, one end of the secondary filter element is detachably connected with the top wall of the filter flask, and the other end of the secondary filter element passes through the detachment hole and is connected with or abutted to the flask cover.

5. The filter element assembly according to claim 4, wherein a sealing ring is provided between the secondary filter element and the side wall of the removal hole.

6. The filter element assembly of claim 4, wherein an extension cylinder is arranged on the face of the first support cover opposite to the bottle cap, the aperture of the extension cylinder is the same as that of the disassembly hole, one end of the extension cylinder, which is far away from the first support cover, is abutted against the bottle cap, and the secondary filter element sequentially passes through the disassembly hole and the extension cylinder is connected or abutted against the bottle cap.

7. The filter element assembly according to any one of claims 1 to 6, wherein the primary filter element is cylindrical, and the filtering surface of the primary filter element is an arc surface which is concave inwards from two ends to the middle part.

8. The filter element assembly according to any one of claims 3 to 6, wherein a water outlet joint assembly is arranged in the filter bottle, the water outlet joint assembly is arranged between the secondary filter element and the top wall of the filter bottle, a water outlet passage is arranged in the water outlet joint assembly, one end of the water outlet passage is communicated with a water production port of the secondary filter element, the other end of the water outlet passage is positioned in the water inlet, and the water outlet joint assembly is arranged at a distance from the side wall of the water inlet to form a water inlet gap communicated with the first filtering gap.

9. The filter element assembly according to claim 8, wherein said water outlet connector assembly comprises a fixed barrel, a movable barrel and an elastic reset piece, one end of the fixed cylinder is communicated with the water producing port of the secondary filter element, the other end of the fixed cylinder extends into the water inlet, the hollow space of the fixed cylinder forms the water outlet passage, the elastic reset piece is sleeved outside the fixed cylinder, the movable cylinder is sleeved outside the elastic reset piece, the movable cylinder and the side wall of the water inlet are arranged at intervals to form the water inlet gap, the bottom end of the elastic reset piece is abutted against the secondary filter element, the top end of the elastic reset piece is abutted against the movable cylinder, the outer ring of the movable cylinder is provided with a sealing position, the diameter of the sealing position is larger than that of the water inlet, the elastic reset piece can enable the moving cylinder to be axially abutted against the sealing position to seal the water inlet.

10. The filter element assembly according to claim 9, further comprising a middle cylinder and a second support cover, wherein the second support cover is disposed in the space between the support ring and the top wall of the filter flask, the second support cover is connected to the water producing end of the secondary filter element, the second support cover is provided with a through hole, the wall of the through hole extends in a direction close to the top wall of the filter element to form an auxiliary cylinder, the middle cylinder is sleeved outside the elastic reset member, the top end of the elastic reset member abuts against the middle cylinder, one end of the middle cylinder close to the secondary filter element is inserted into the auxiliary cylinder, the middle cylinder and the auxiliary cylinder can move relatively in the axial direction, one end of the movable cylinder close to the support ring is sleeved outside the auxiliary cylinder, and the movable cylinder and the auxiliary cylinder can move relatively in the axial direction, one end, far away from the support ring, of the movable cylinder is sleeved outside the middle cylinder, a shoulder is arranged on the outer wall of the middle cylinder, and when the elastic reset enables the middle cylinder to be pressed towards the direction far away from the secondary filter element, the shoulder pushes the movable cylinder towards the direction far away from the secondary filter element.

11. The filter element assembly according to any one of claims 1 to 6, wherein the primary filter element comprises a melt blown PP cotton filter element or a polypropylene activated carbon fiber filter element.

12. The filter element assembly according to any one of claims 1 to 6, wherein the secondary filter element is an ultrafiltration membrane filter element.

13. An ultrafiltration water purifier, characterized by comprising the filter element assembly of any one of claims 1 to 11.

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