CN113289493A

CN113289493A - Reverse osmosis membrane filter core and purifier

Info

Publication number: CN113289493A
Application number: CN202110484483.7A
Authority: CN
Inventors: 孙丽英; 杨磊; 温南南; 赵辉; 谢交兵
Original assignee: Qingdao Haier Strauss Water Equipment Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Strauss Water Equipment Co Ltd; Haier Smart Home Co Ltd
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2021-08-24

Abstract

The invention discloses a reverse osmosis membrane filter element and a water purifying device, which comprise a shell, wherein a first end part of the shell is provided with a raw water inlet, a pure water inlet and a concentrated water inlet, and the shell extends inwards to form a raw water inlet chamber, a pure water outlet chamber and a concentrated water outlet chamber; the water stopping component is respectively arranged in the raw water inlet chamber, the pure water outlet chamber and the concentrated water outlet chamber; the reverse osmosis membrane module is arranged in the shell and comprises a membrane module and a central pipe; and the separation sealing assembly is arranged among the side walls of the raw water inlet chamber, the pure water outlet chamber and the concentrated water outlet chamber and the inner wall of the shell and is used for separating a water path to form a raw water path, a pure water path and a concentrated water path. Above-mentioned reverse osmosis membrane filter core separates seal assembly and borrows the clearance completion sealing function between raw water intake chamber, pure water play water room and the dense water play water room, realizes that the stagnant water layer arranges on the radial direction of filter core with separating the sealing layer, rather than arranging from top to bottom, can improve the inside space utilization of filter flask, can realize the little volume big flux of filter core.

Description

Reverse osmosis membrane filter core and purifier

Technical Field

The invention relates to the technical field of water purification, in particular to a reverse osmosis membrane filter element.

Background

With the increasing sanitary requirements of people on drinking water, water purifiers are used more and more widely in different occasions (such as families, enterprises, entertainment places and the like). The purifier need renew cartridge in the use, in order to guarantee that the user is when renew cartridge, the inside water of filter core does not flow, need set up contrary structure in filter flask inlet outlet position, when the filter flask was installed on the machine promptly, the inlet outlet was opened, and water can flow according to water route design direction, and when renewing the filter core, the inlet outlet was closed because of the effect of contrary structure that ends, and the inside water of filter flask can not flow.

The existing filter element structure is designed in a non-return structure and a structure with a sealing effect in an up-down layered mode, for example, a one-way valve type filter element water stop structure in the Chinese patent with the publication number of CN205877285U, comprises a reverse osmosis membrane, a switching sleeve and a shell which are sleeved from inside to outside in sequence, a pure water channel is arranged in the reverse osmosis membrane, a gap is reserved between the reverse osmosis membrane and the switching sleeve to serve as a waste water channel, a gap is reserved between the switching sleeve and the shell to serve as a raw water channel, the raw water channel is communicated with the reverse osmosis membrane, a raw water inlet communicated with the raw water channel, a pure water outlet communicated with the pure water channel and a waste water outlet communicated with the waste water channel are arranged on the switching sleeve, and an inner bushing is arranged on the switching sleeve. This patent includes from inside to outside in proper order the reverse osmosis membrane of establishing, switching cover and shell, and it realizes the contrary effect that ends of business turn over water through ejector pin and spring, realizes sealed effect through the sealing washer between switching cover and the neck bush, and both are upper and lower layer design, have just so wasted the inside space of filter flask to lead to the size of reverse osmosis membrane in the filter flask to shorten, reduced the filter effect.

Disclosure of Invention

Based on the technical problem, the invention aims to provide the reverse osmosis membrane filter element and the water purifying device which are small in size and high in utilization rate of the internal volume of the filter bottle.

In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme:

a reverse osmosis membrane cartridge comprising:

the first end part of the shell is provided with an original water gap, a pure water gap and a concentrated water gap, the shell extends inwards along the original water gap, the pure water gap and the concentrated water gap respectively to form a raw water inlet chamber, a pure water outlet chamber and a concentrated water outlet chamber, and the side walls of the raw water inlet chamber, the pure water outlet chamber and the concentrated water outlet chamber are provided with water through holes;

the water stopping component is respectively arranged in the raw water inlet chamber, the pure water outlet chamber and the concentrated water outlet chamber;

the reverse osmosis membrane module is arranged in the shell and comprises a membrane module and a central pipe;

and the separation sealing assembly is arranged among the side walls of the raw water inlet chamber, the pure water outlet chamber and the concentrated water outlet chamber and the inner wall of the shell, and is used for separating a water path to form a raw water path, a pure water path and a concentrated water path.

Further, the separation seal assembly includes:

a first end cap including a cap body and a boss projecting along the cap body toward a first end of the housing; the cover body is covered at one end of the membrane component, and a water inlet is formed in the cover body; the bulge is arranged between the side walls of the raw water inlet chamber and the concentrated water outlet chamber and the inner wall of the shell and is used for separating a raw water channel and a concentrated water channel;

and the first end part of the sealing pipe fitting is hermetically connected with the side wall of the pure water outlet chamber, and the second end part of the sealing pipe fitting is hermetically connected with the central pipe.

Further, the air conditioner is provided with a fan,

the inner wall surface of the first end part of the shell is provided with an inner ring part and an outer ring part which extend inwards, the pure water outlet chamber is arranged in the inner ring part, the raw water inlet chamber is arranged between the inner ring part and the outer ring part, and the concentrated water outlet chamber is arranged between the outer ring part and the side wall of the shell;

the bulge part comprises an outer ring bulge and an inner ring bulge, a containing cavity is formed between the outer ring bulge and the inner ring bulge, the water inlet is formed in one side, close to the membrane assembly, of the containing cavity, and the other side of the containing cavity is communicated with the raw water inlet chamber; the outer ring bulge and the inner ring bulge are inserted between the inner ring part and the outer ring part of the shell, and the first end part of the sealing pipe fitting is sleeved on the outer wall of the pure water outlet chamber and is connected with the inner wall of the inner ring part in a sealing mode.

Further, the air conditioner is provided with a fan,

the outer ring bulge of the bulge part is connected with the inner wall of the outer ring part of the shell in a sealing way through a first sealing ring;

the first end part of the sealing pipe fitting is connected with the inner wall of the inner ring part of the shell in a sealing mode through a second sealing ring;

and the second end part of the sealing pipe fitting is connected with the inner wall of the central pipe in a sealing way through a third sealing ring.

Further, a scale inhibitor is arranged in the containing cavity.

Furthermore, a scale inhibitor cover plate is arranged at the top of the boss and covers the accommodating cavity; and a plurality of water leakage holes are formed in the scale inhibitor cover plate.

Further, the water stop assembly includes:

the plugging caps are respectively arranged in the raw water inlet chamber, the pure water outlet chamber and the concentrated water outlet chamber in an axial sliding manner, and can enable the raw water port, the pure water port and the concentrated water port to be respectively communicated with the water through holes of the raw water inlet chamber, the pure water outlet chamber and the concentrated water outlet chamber after moving inwards;

the elastic piece is connected with the plugging cap and used for resetting the plugging cap;

and the retaining rings are respectively fixed in the original water gap, the pure water gap and the concentrated water gap of the shell and are used for blocking the outward movement of the plugging cap.

Further, a second end cover is arranged at the end part, close to the first end of the shell, of the membrane module, and a water outlet is formed in the second end cover; the water outlet is provided with a non-return structure which only allows concentrated water to flow out from the membrane module.

Further, it includes the rubber buffer to end structure, the rubber buffer includes the bowl portion of indent and is located the fixed arch at bowl portion center, fixed arch is fixed in on the second end cover, bowl portion is detained and is located on the delivery port.

The invention also comprises a water purifying device which comprises the reverse osmosis membrane filter element.

Compared with the prior art, the invention has the advantages and positive effects that:

above-mentioned reverse osmosis membrane filter core separates seal assembly and borrows the clearance completion sealing function between raw water intake chamber, pure water play water room and the dense water play water room, realizes that the stagnant water layer arranges on the radial direction of filter core with separating the sealing layer, rather than arranging from top to bottom, can improve the inside space utilization of filter flask, can realize the little volume big flux of filter core.

Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.

Drawings

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

FIG. 1 is a perspective view of the reverse osmosis membrane cartridge of the present invention;

FIG. 2 is a perspective view of the reverse osmosis membrane cartridge of the present invention with the housing concealed;

FIG. 3 is a cross-sectional view of a reverse osmosis membrane cartridge of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 3 at I;

FIG. 5 is a schematic structural diagram of a first end cover and a scale inhibitor cover plate in a reverse osmosis membrane filter element according to the present invention;

FIG. 6 is an exploded view of FIG. 5;

FIG. 7 is a schematic view of a first end cap of a reverse osmosis membrane cartridge according to the present invention;

FIG. 8 is a bottom view of the housing of the reverse osmosis membrane cartridge of the present invention;

FIG. 9 is a schematic structural view of a rubber stopper in a reverse osmosis membrane cartridge according to the present invention;

FIG. 10 is a partial process diagram at II in FIG. 3;

description of reference numerals:

a housing 100;

a housing end cap 110;

a cartridge handle 120;

a raw water port 131; a pure water port 132; a concentrate port 133;

a raw water inlet chamber 141; a pure water outlet chamber 142; a concentrated water outlet chamber 143;

an inner ring portion 151; an outer ring portion 152;

a reverse osmosis membrane module 200;

a center tube 210;

a membrane module 220;

a water stop assembly 300;

a plugging cap 310;

an elastic member 320;

a retainer ring 330;

a first end cap 400;

a cap body 410; a water inlet 411;

a boss portion 420; an outer ring projection 421; an inner ring protrusion 422; vertical grooves 4221;

an accommodating cavity A; avoiding a space B;

sealing the tube 500;

a scale inhibitor 600;

a scale inhibitor cover plate 610; water leakage holes 611; a resilient catch 612;

a first seal ring 710;

a second seal ring 720;

a third seal ring 730;

a second end cap 800;

a water outlet 810;

a rubber plug 900;

a bowl portion 910;

and a fixing protrusion 920.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

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 one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

Referring to fig. 1-10, one embodiment of a reverse osmosis membrane cartridge of the present invention is shown. As shown in fig. 1 to 3, the reverse osmosis membrane cartridge includes a housing 100, a reverse osmosis membrane module 200 disposed in the housing 100, a water stopping module 300, and a separation sealing module.

The reverse osmosis membrane module 200 includes a central pipe 210 and a membrane module 220 wrapped outside the central pipe 210. The central tube 210 is provided with through holes through which water filtered by the membrane module 220 enters the central tube.

The first end of the housing 100 is opened with a raw water port 131, a pure water port 132, and a concentrate port 133. In this embodiment, one end of the housing 100 is closed off, and the other end is provided with a housing end cap 110. The end of shutoff is the first tip, and the one end that sets up shell end cover 110 is the second tip, and the second tip still is provided with filter core handle 120.

As shown in fig. 4, the housing 100 extends inward along the raw water port 131, the pure water port 132, and the concentrated water port 133 to form a raw water inlet chamber 141, a pure water outlet chamber 142, and a concentrated water outlet chamber 143, and the side walls of the raw water inlet chamber 141, the pure water outlet chamber 142, and the concentrated water outlet chamber 143 are all provided with water through holes. In this embodiment, the side walls of the raw water inlet chamber 141, the pure water outlet chamber 142, and the concentrated water outlet chamber 143 are formed by four vertical ribs, and the gaps between the four vertical ribs form water passing holes.

The water stopping member 300 is disposed in the raw water inlet chamber 141, the pure water outlet chamber 142, and the concentrated water outlet chamber 143, respectively. When the water stopping assembly 300 is used for replacing the filter element, the water in the filter bottle can not flow out. The water stopping member 300 is disposed in the raw water inlet chamber 141, the pure water outlet chamber 142, and the concentrated water outlet chamber 143 to form a water stopping layer.

The separation sealing assembly is disposed between the sidewalls of the raw water inlet chamber 141, the pure water outlet chamber 142, and the concentrated water outlet chamber 143, and the inner wall of the housing, and is configured to separate water paths to form a raw water path, a pure water path, and a concentrated water path. The separation sealing component is connected with the side walls of the raw water inlet chamber 141, the pure water outlet chamber 142 and the concentrated water outlet chamber 143 in a sealing manner to form a separation sealing layer.

According to the reverse osmosis membrane filter element, the separation sealing component completes the sealing function by means of the gaps among the raw water inlet chamber 141, the pure water outlet chamber 142 and the concentrated water outlet chamber 143, the water stop layer and the separation sealing layer are arranged in the radial direction of the filter element instead of being arranged up and down, the space utilization rate inside the filter bottle can be improved, and the small volume and the large flux of the filter element can be realized.

In the present embodiment, the separation sealing assembly includes a first end cap 400 and a sealing tube 500.

The structure of the first end cap 400 is shown in fig. 5-7. The first end cap 400 includes a cap body 410 and a boss 420 protruding toward the first end of the case 100 along the cap body 410. The cover body 410 is covered on one end of the membrane module 220, and is provided with a water inlet 411, and raw water enters the membrane module 220 of the reverse osmosis membrane module 200 through the water inlet 411. The protrusion 420 is disposed between the sidewalls of the raw water inlet chamber 141 and the concentrated water outlet chamber 143 and the inner wall of the housing, and separates a raw water path and a concentrated water path.

Specifically, referring to fig. 8, the inner wall surface of the first end portion of the housing 100 has an inner ring portion 151 and an outer ring portion 152 extending inward, the pure water outlet chamber 142 is disposed in the inner ring portion 151, the raw water inlet chamber 141 is disposed between the inner ring portion 151 and the outer ring portion 152, and the concentrated water outlet chamber 143 is disposed between the outer ring portion 152 and the side wall of the housing 100.

The boss 420 includes an outer ring protrusion 421 and an inner ring protrusion 422, and a receiving cavity a is formed between the outer ring protrusion 421 and the inner ring protrusion 422. A water inlet 411 is formed in one side of the accommodating cavity A close to the membrane module 220, and the other side of the accommodating cavity A is communicated with the raw water inlet chamber 141; the outer ring protrusion 421 and the inner ring protrusion 422 are interposed between the inner ring portion 151 and the outer ring portion 152 of the housing 100. In this embodiment, as shown in fig. 4, the outer ring protrusion 421 of the protrusion 420 is connected to the inner wall of the outer ring portion 152 of the housing 100 by a first sealing ring 710 in a sealing manner. The water inlet 411 is a plurality of strip-shaped through holes which are evenly distributed along the circumference of the accommodating cavity A.

The structure of the sealing tube 500 is shown in fig. 4. The first end of the sealing tube 500 is sleeved on the outer wall of the pure water outlet chamber 142 and is connected to the inner wall of the inner ring 151 in a sealing manner. Specifically, a first end of the sealing tube member 500 is sealingly connected to the sidewall of the pure water outlet chamber 142, and a second end of the sealing tube member 500 is sealingly connected to the center tube 210. In this embodiment, the inner diameter of the first end of the sealing tube 500 is larger than that of the second end, and the first end of the sealing tube 500 is connected to the inner wall of the inner ring 151 of the housing 100 via the second sealing ring 720; the second end of the sealing tube member 500 is sealingly connected to the inner wall of the center tube 210 by a third sealing ring 730.

The membrane component of the reverse osmosis membrane component is composed of membranes, the membranes play a role in purifying water by physical interception, impurities intercepted by reverse osmosis membranes are gathered on the membranes, particularly calcium and magnesium particles are easy to scale, bad phenomena such as reverse osmosis membrane blockage, small water outlet flow, membrane performance attenuation and the like are easily caused, a common method on the market is to add a scale inhibitor, but the scale inhibitor is usually added into a front filter element, so that the condition that phosphorus exceeds the standard during testing of the front filter element is easily caused, and the national standard is not met.

In order to solve the above problem, in the present embodiment, the scale inhibitor 600 is provided in the accommodation chamber a of the first end cap 400. The scale inhibitor 600 is arranged at the gap between the water stop layer and the separation sealing layer, so that the problem that the reverse osmosis membrane is easy to block the membrane can be solved, and other spaces of the filter bottle cannot be occupied.

In the present embodiment, since the raw water inlet chamber 141 is disposed between the inner ring portion 151 and the outer ring portion 152 of the housing 100, corresponding to the position of the first cap 400, between the outer ring protrusion 421 and the inner ring protrusion 422. Therefore, a part of the space between the outer ring protrusion 421 and the inner ring protrusion 422 needs to be used for accommodating the raw water inlet chamber 141, that is, the space between the outer ring protrusion 421 and the inner ring protrusion 422 is composed of an accommodating cavity a and an avoiding space B, see fig. 6. The accommodating cavity A is used for accommodating the scale inhibitor 600, and the avoiding space B is used for accommodating the raw water inlet chamber 141.

In order to fix the scale inhibitor 600, as shown in fig. 5 and 6, a scale inhibitor cover plate 610 is disposed on the top of the protrusion 420, and the scale inhibitor cover plate 610 is covered on the accommodating chamber a. The scale inhibitor cover plate 610 is provided with a plurality of water leakage holes 611 for raw water to enter the accommodating cavity A. The raw water entering the accommodating chamber a passes through the scale inhibitor 600 and then enters the membrane module 220 through the water inlet 411. In this embodiment, the scale inhibitor cover plate 610 is preferably provided with elongated water leakage holes 611, and the water leakage holes 611 are uniformly distributed along a circumference of the scale inhibitor cover plate 610. The scale inhibitor cover plate 610 has a plurality of elastic claws 612 on the lower side of the inner ring, and the elastic claws 612 extend into the lower side along the inner wall of the inner ring protrusion 422 of the first end cover 400 to be clamped and fixed with the first end cover 400. The inner wall of the inner ring protrusion 422 may further be provided with a vertical groove 4221, the elastic claw 612 is clamped along the vertical groove 4221, and the positioning may be performed when the scale inhibitor cover plate 610 is clamped, so that the notch on the scale inhibitor cover plate 610 corresponds to the avoiding space B on the first end cap 400.

In the present embodiment, referring to fig. 4, the water stopping assembly 300 includes a blocking cap 310, an elastic member 320, and a retainer ring 330. The blocking cap 310 is axially slidably disposed in the raw water inlet chamber 141, the pure water outlet chamber 142, and the concentrated water outlet chamber 143. After the filter element is mounted and the blocking cap 310 moves inward, the blocking cap 310 can make the raw water port 131, the pure water port 132 and the concentrated water port 133 respectively communicate with the water through holes of the raw water inlet chamber 141, the pure water outlet chamber 142 and the concentrated water outlet chamber 143. The elastic member 320 is preferably a spring, the spring is disposed in the raw water inlet chamber 141, the pure water outlet chamber 142 and the concentrated water outlet chamber 143, and an end of the spring is connected to the blocking cap 310 for resetting the blocking cap 310 after the filter element is detached. A retainer ring 330 is fixed in the raw water port 131, the pure water port 132 and the concentrate port 133 of the housing 100 for blocking the outward movement of the blocking cap 310. In this embodiment, the retainer ring 330 is preferably a seal ring. After the plugging cap 310 is reset, the plugging cap 310 is contacted with the retainer ring 330 due to the elastic force of the spring, so that the function of sealing and stopping water is realized.

The reverse osmosis water purifier has the shortcoming that the TDS of the first cup of water after starting up is higher and is difficult to drink, and the scheme of solving this problem on the market is many, for example utilize pure water backward flow, little reverse osmosis membrane to wash big reverse osmosis membrane, increase the scheme such as clean water jar washing, these schemes have all increased part module and whole quick-witted cost newly, and the complete machine volume also can increase.

In order to solve the above problem, in the embodiment, a non-return structure is added at the water outlet end of the reverse osmosis membrane module 200 to solve the problem that the TDS of the first cup of water is higher when the water is started.

In this embodiment, the reverse osmosis membrane cartridge includes a housing 100, and a reverse osmosis membrane module 200 disposed in the housing 100. The reverse osmosis membrane module 200 includes a central pipe 210 and a membrane module 220 wrapped outside the central pipe 210.

Specifically, a second end cover 800 is disposed at an end portion of the membrane module 220 close to the first end of the housing, and a water outlet 810 is formed in the second end cover 800. The water outlet 810 is provided with a check structure for allowing only the concentrated water to flow out from the membrane module 220.

Preferably, as shown in fig. 9 and 10, the backstop structure includes a rubber plug 900, the rubber plug 900 includes a concave bowl portion 910 and a fixing protrusion 920 located at the center of the bowl portion 910, the fixing protrusion 920 is fixed on the second end cap 800, and the bowl portion 910 is buckled on the water outlet 810.

When normal system water, the rivers direction is as shown in fig. 10, because the pushing action of rivers, rubber buffer 900 opens downwards, and dense water passes through dense water route through rubber buffer 900, discharges filter core housing 100 through dense mouth of a river 133. If the long-time standby of normal machine, the ion in the dense water route can reverse osmosis to in the membrane module 220, nevertheless because the rubber buffer 900 has been installed in the delivery port 810 department at second end cover 800, can effectively prevent the ion infiltration, solve the first cup of water TDS of start-up problem on the high side. In other embodiments, the non-return structure may be a one-way valve or other structure.

The invention also comprises a water purifying device, wherein the reverse osmosis membrane filter element is arranged in the water purifying device. The water purifying device using the reverse osmosis membrane filter element has the advantages that the sealing function is completed by separating the sealing component through the gaps among the raw water inlet chamber, the pure water outlet chamber and the concentrated water outlet chamber, the water stop layer and the separation sealing layer are arranged in the radial direction of the filter element instead of being arranged from top to bottom, the space utilization rate inside the filter element can be improved, the small volume and the large flux of the filter element can be realized, the cost is reduced, and the purifying effect of the water purifying device is improved.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims

1. A reverse osmosis membrane filter element, comprising:

2. The reverse osmosis membrane cartridge of claim 1, wherein the separation seal assembly comprises:

3. The reverse osmosis membrane cartridge of claim 2,

4. A reverse osmosis membrane cartridge according to claim 3,

5. The reverse osmosis membrane cartridge of claim 3, wherein a scale inhibitor is disposed within the containment chamber.

6. The reverse osmosis membrane filter element of claim 5, wherein the top of the boss is provided with a scale inhibitor cover plate which is covered on the accommodating cavity; and a plurality of water leakage holes are formed in the scale inhibitor cover plate.

7. The reverse osmosis membrane cartridge of claim 1, wherein the water shut-off assembly comprises:

8. The reverse osmosis membrane cartridge of any one of claims 1-7, wherein a second end cap is provided at an end of the membrane module adjacent to the first end of the housing, the second end cap having a water outlet; the water outlet is provided with a non-return structure which only allows concentrated water to flow out from the membrane module.

9. A reverse osmosis membrane filter core according to claim 8, wherein the non-return structure comprises a rubber plug, the rubber plug comprises an inwards concave bowl part and a fixing protrusion positioned at the center of the bowl part, the fixing protrusion is fixed on the second end cover, and the bowl part is buckled on the water outlet.

10. A water purification apparatus comprising a reverse osmosis membrane cartridge according to any one of claims 1 to 9.