CN111170489A

CN111170489A - Composite filter element

Info

Publication number: CN111170489A
Application number: CN202010094341.5A
Authority: CN
Inventors: 王四化; 刘建勋; 赵福龙; 余锋
Original assignee: Guangdong Shuihudun Health Technology Co Ltd
Current assignee: Guangdong Shuihudun Health Technology Co Ltd
Priority date: 2020-02-15
Filing date: 2020-02-15
Publication date: 2020-05-19

Abstract

The invention relates to a composite filter element, which comprises an outer filter element and an inner filter element, wherein the outer filter element comprises a first outer shell, an RO (reverse osmosis) membrane and a filter element pipe; the rear end of the first outer shell is provided with a raw water inlet channel, a concentrated water discharge channel and a purified water discharge channel; the tube body of the filter element tube is sleeved in the first outer shell, an outer cavity is formed between the first outer shell and the filter element tube, and the RO membrane is arranged in the outer cavity; the end surface of the rear end of the RO membrane is communicated with the concentrated water discharge channel; the inner filter element is arranged in the filter element tube and comprises a second cylindrical outer shell and a raw water inlet tube, and the second outer shell is partitioned into a pretreatment cavity and a post-treatment cavity which are not communicated with each other in the axial direction; the raw water inlet pipe is communicated with the raw water inlet channel, penetrates through the post-treatment cavity from the rear end of the first outer shell and is communicated with the pre-treatment cavity, and the pre-treatment cavity is communicated with the front end of the outer cavity; the inner side surface of the rear end of the RO membrane is communicated with the aftertreatment cavity. Integrates a plurality of filter materials into a whole, has more compact structure and ensures that the channel of water flow meets the requirement of filtration treatment.

Description

Composite filter element

Technical Field

The invention belongs to the technical field of water purification, and particularly relates to a composite filter element.

Background

The RO (Reverse Osmosis) membrane Reverse Osmosis water purifier is a water purifier commonly used in the prior art, the purification principle is that Reverse Osmosis is realized by pressurization, the aperture of the RO Reverse Osmosis membrane is as small as nanometer, water molecules can pass through the RO membrane under certain pressure, and impurities such as inorganic salt, heavy metal ions, organic matters, colloid, bacteria, viruses and the like in source water cannot pass through the RO membrane, so that permeable pure water and impermeable concentrated water are strictly distinguished.

In order to increase the purification effect of the RO membrane water purifier in the prior art, impurities with larger particles are often filtered by a pre-filtration treatment process, and the taste of the purified water is increased by post-filtration treatment. The arrangement of the pretreatment filter element, the post-treatment filter element and the RO membrane provided in the prior art occupies a larger space, and in the process of multi-stage water purification, water flow needs to be subjected to pre-filtration, then passes through the RO membrane, and finally is subjected to post-filtration to complete the purification process of the composite filter element, so that the design of a water channel is unreasonable, and the volume of a final product is also easy to cause. And the plastic shell body material for packaging the plastic shell body is used more, which also causes the waste of the plastic material and has negative influence on the environment. Therefore, there is a need in the art for a filter element structure that is more compact and reasonably integrates a pretreatment filter element, a post-treatment filter element, and an RO membrane, and allows the passage of water flow to meet the filtration treatment requirements.

Fig. 1 shows a RO membrane water purifier commonly used in the prior art, and it can be found by combining fig. 2, it includes center tube 010 with a plurality of through holes 011, and, the cover is established RO membrane 020 outside the side surface of center tube 010, RO membrane 020 is the columnar filter material that comprises a plurality of diaphragms 021, and in use, untreated raw water enters RO membrane 020 from the left end of RO membrane 020 along the direction of black arrow in fig. 1 and filters, and the purified water after filtering passes through holes 011 and then enters center tube 010 to finally discharge from delivery port 012 for the user to use, and the concentrated water that has enriched more impurity after filtering is then discharged from the right-hand member of RO membrane 020. When the filtration is stopped, the purified water filtered by the RO membrane is stored in the purified water retention zone 040 and the central tube 010, and particularly for the general household large-flux RO membrane, the volume of the stored water is not less than 120ml, while the concentrated water is temporarily stored in the concentrated water retention zone 030 and the concentrated water pipeline, and the general volume is about 200 ml. According to the osmotic diffusion principle of the RO membrane, when the water purifier stops operating, no pressure difference exists between two surfaces of two membranes of the RO membrane, the TDS value of pure water stored in the RO membrane 020 gradually increases until the TDS value is close to that of concentrated water, which means that elements (such as arsenic, lead, cadmium, nickel, mercury and the like) which are partially harmful to human health enter a purified water pipeline along with the produced water of the water purifier again and are finally used by a user. The important advantage of the large-flux water purifier in the market is that the water purifier can provide purified water for users to drink instantly, if the purified water taken by the users is less each time, the users can use the unqualified purified water each time when the users begin to take the purified water, the requirement of the health standard cannot be met, and the problem is also called as 'head cup water'. Various methods for solving the problem of head cup water are provided in the prior art, for example, by arranging a detection structure and a design circuit, and arranging an indicator lamp at a water outlet of purified water, people can drain off unqualified water and take the unqualified water, so that the method wastes water and needs processing time; one way is that a flow channel for water is additionally arranged, so that when a user takes purified water, unqualified water is discharged, and the purified water is supplied to the user after the water quality is qualified, which not only wastes water and wastes treatment time, but also increases the cost of equipment and increases the volume of the equipment; in another mode, after RO membrane filtration, post-treatment filter element treatment is carried out, meanwhile, the space of the post-treatment process is increased, and unqualified water is mixed with qualified water stored in the post-treatment filter element, so that the concentration of unqualified impurities in the head cup water is reduced, but the problem cannot be fundamentally solved; in order to fundamentally solve the problem of head cup of water, technicians design flow channels of water flow to return unqualified water to the pre-treatment step for re-filtration, but the cost of equipment is undoubtedly greatly increased, and the process time for preparing purified water is prolonged. Because the above solutions all have defects, the prior art also lacks an effective technical means, and perfectly solves the technical problem of the head cup of water while the RO membrane water purifier in the prior art is changed less and does not occupy larger space.

In addition, in order to meet the requirement of large flux of purified water, the prior art generally adopts the increase of the volume of the RO membrane filter material, the volume of the filter material for pre-treatment and post-treatment of water is inconvenient to maintain, the service life of the RO membrane is longer, the filter material for pre-treatment and post-treatment is more frequently replaced due to the structure and the characteristics, if all the filter materials are replaced at one time, great waste is generated, and the replaced plastic shell can cause negative influence on the environment.

Disclosure of Invention

The invention aims to provide a composite filter element, which overcomes the technical problems, can integrate various filter materials into a whole, has a more compact structure and enables a water flow channel to meet the requirements of filtration treatment.

In order to achieve the technical purpose, the technical scheme of the invention is as follows:

a composite filter element, comprising:

the filter comprises an outer filter element and a filter element, wherein the outer filter element comprises a cylindrical first outer shell, an RO (reverse osmosis) membrane, an upper cover and a filter element pipe; the front end of the first outer shell is hermetically connected with the upper cover; the rear end of the first outer shell is provided with a raw water inlet channel, a concentrated water discharge channel and a purified water discharge channel; the filter element pipe comprises a pipe body, the pipe body is sleeved in the first outer shell, an outer cavity is formed between the first outer shell and the filter element pipe, and the RO membrane is columnar and arranged in the outer cavity; the end surface of the rear end of the RO membrane is communicated with the concentrated water discharge channel, and the post-treatment cavity is communicated with the purified water discharge channel;

an inner filter element disposed within the filter element tube; the inner filter element comprises a cylindrical second outer shell and a raw water inlet pipe, two ends of the second outer shell are closed, and the second outer shell is partitioned into a pretreatment cavity and a post-treatment cavity in the axial direction; a pretreatment filter element is arranged in the pretreatment cavity, and a post-treatment filter element is arranged in the post-treatment cavity; the raw water inlet pipe is communicated with the raw water inlet channel, penetrates through the post-treatment cavity from the rear end of the first outer shell and is communicated with the pre-treatment cavity, and the pre-treatment cavity is communicated with the front end of the outer cavity; the inner side surface of the rear end of the RO membrane is communicated with the aftertreatment cavity.

The composite filter element provided by the invention has the following beneficial effects:

1. untreated raw water enters the raw water inlet pipe from the raw water inlet channel, flows into the pretreatment cavity, is subjected to pre-filtration treatment by the pretreatment filter element, and can generally filter colloidal impurities and particles with the diameter larger than 5 microns in the raw water; the pre-filtered water flows from the front treatment cavity to the front end of the outer cavity and flows into the RO membrane to filter out impurities such as heavy metal ions in the water flow, the purified water treated by the RO membrane enters the post-treatment cavity from the first through hole, and is filtered again by the post-treatment filter element, so that bacteria in the water are reduced, the taste is improved, and the purified water treated by the post-treatment filter element is discharged from the purified water discharge channel; and the concentrated water (water enriched with more impurities) treated by the RO membrane is discharged from the concentrated water discharge channel; therefore, the outer filter element and the inner filter element can realize multi-stage filtration of purified water;

2. the pretreatment filter element and the post-treatment filter element are integrated in the inner filter element, and the pretreatment cavity and the post-treatment cavity are enclosed by the second outer shell, so that the use of a plastic shell is reduced; the raw water inlet pipe penetrates through the post-treatment cavity to be communicated with the pre-treatment cavity, so that the overall structure of the inner filter element is more compact, water flows sequentially through the pre-treatment filter element, the RO membrane and the post-treatment filter element, a water flow channel skillfully utilizes gaps among all cavities, the layout is reasonable, the occupied space in the water path circulation process is smaller, and the miniaturization of a product is facilitated;

3. because the front and rear treatment filter elements are directly assembled in the outer filter elements, the independent shells of the front and rear treatment filter elements are omitted, and compared with the traditional product containing the front and rear treatment filter elements, the plastic shell scrapping rate is reduced, and the harm to the environment is reduced.

The pretreatment filter element is made of PP cotton and carbon fiber composite fibers, and the post-treatment filter element is made of carbon fiber materials.

Preferably, a first through hole is formed in the tube body of the filter element tube, a fifth through hole communicated with the first through hole is formed in the rear end of the second outer shell, a third sealing ring is further arranged between the tube body of the filter element tube and the second outer shell, and the third sealing ring seals the first through hole and the end face of the rear end of the RO membrane, so that a sealing channel is formed between the first through hole and the fifth through hole; and the third sealing ring, the first outer shell, the second outer shell and the end surface of the rear end of the RO membrane enclose a second flow channel cavity, and the second flow channel cavity is communicated with the concentrated water discharge channel. The arrangement can ensure that water flows into the post-treatment cavity from the rear end of the outer cavity after being filtered by the RO membrane, and is filtered again by the post-treatment filter element. And the structure is simple, the production is easy, and the volume of the product is reduced.

The filter element pipe further comprises a sealing cover part, the sealing cover part covers the end face of the rear end of the RO membrane, the sealing cover part is respectively connected with the pipe body and the first outer shell in a sealing mode, and the sealing cover part, the first outer shell and the pipe body enclose to form the outer cavity; the sealing cover part is provided with a second through hole, and the rear end of the outer cavity is communicated with the concentrated water discharge channel through the second through hole. The structure can improve the sealing performance of the second runner cavity and avoid the problem of water mixing between the concentrated water and the purified water.

The first central pipe is arranged in the pretreatment cavity; the pipe wall of the first central pipe is provided with a through hole; the pretreatment filter element is columnar and sleeved outside the side surface of the first central tube, the pretreatment filter element comprises a first end close to the aftertreatment cavity and a second end far away from the aftertreatment cavity in the axial direction, a first sealing end cover and a second sealing end cover are arranged on the first end and the second end, the first sealing end cover seals the first end and the first central tube, the second sealing end cover seals the second end, and the second sealing end cover is connected with the second outer shell in a sealing manner; the outer side surface of the pretreatment filter element is exposed in the pretreatment cavity. When raw water enters the pretreatment cavity from the raw water inlet pipe, the raw water is firstly contacted with the outer side surface of the pretreatment filter element and passes through the pretreatment filter element to enter the first central pipe, so that the utilization efficiency of the pretreatment filter element is increased, and the treatment water quantity is increased. The pretreated purified water flows into the outer cavity from the first central pipe and is filtered by the RO membrane.

The inner side of the upper cover is also provided with a sealing edge which extends inwards from the inner side of the upper cover, the sealing edge is annular, the first central pipe is inserted into the sealing edge, and the sealing edge seals the pipe orifice of the first central pipe; a third through hole is formed in the part of the pipe wall of the first central pipe, which extends out of the second sealing end cover, a first flow passage cavity is formed by the upper cover, the second sealing end cover and part of the second outer shell, and the first flow passage cavity is communicated with the first central pipe through the third through hole; and a fourth through hole is formed in part of the second outer shell, a second sealing ring is arranged between the second outer shell and the tube body of the filter element tube, a slit is formed between the upper cover and the filter element tube and is communicated with the fourth through hole, and a sealing channel is formed between the fourth through hole and the slit by the second sealing ring. The structure is beneficial to improving the sealing performance of the water flow channel, reducing the using number of parts and being beneficial to modularized processing production and assembly. And water flows into the first flow channel cavity from the third through hole on the first central pipe, passes through the fourth through hole, enters the slit under the sealing action of the second sealing ring, and then enters the front end of the RO membrane.

Preferably, the upper cover is provided with an annular protruding edge portion extending inward, and an L-shaped channel is defined between the protruding edge portion and the slit and between the protruding edge portion and the tube body of the filter element tube. The structure can limit the flow of water and improve the filtering effect of the RO membrane.

Preferably, a seventh sealing ring is arranged between the front end of the RO membrane and the first outer shell, the inner side surface of the RO membrane is tightly attached to the outer side surface of the tube body, and the L-shaped channel is communicated with the end surface of the front end of the RO membrane. In such a structure, the seventh seal ring can be used for sealing the front end of the RO membrane by interference fit between the RO membrane and the first outer shell and the filter element pipe, water enters the RO membrane from the end face of the front end of the RO membrane, and the membrane of the RO membrane is used for filtration treatment.

The device also comprises a second central pipe, wherein the second central pipe is arranged in the aftertreatment cavity; a through hole is formed in the side surface of the second central pipe; the post-treatment filter element is columnar and is sleeved outside the side surface of the second central tube; the end surfaces of two ends of the post-treatment filter element are respectively provided with a third sealing end cover, the third sealing end covers respectively seal the end surfaces of two ends of the post-treatment filter element, and the outer side surface of the post-treatment filter element is exposed in the post-treatment cavity; the second center tube is sleeved outside the raw water inlet tube, one end of the first center tube is connected with the raw water inlet tube in a sealing mode, and the other end of the second center tube penetrates through the second outer shell and is connected with the purified water discharge channel. And after entering the post-treatment cavity, the water subjected to the RO membrane filtration enters the post-treatment filter element from the outer side surface of the post-treatment filter element, then enters the second central tube, is finally discharged from the purified water discharge channel and is supplied to a user. Such structure helps improving the utilization ratio of aftertreatment filter core, improves the efficiency of water purification to make the runner compact structure of rivers, reduce the volume of product.

A sealing gasket is arranged between the third sealing end cover close to the rear end of the first outer shell and the second outer shell; keep away from the third end cover of the rear end of first shell body with raw water inlet tube connects, and seals the second center tube one end to be favorable to improving the sealing performance between the runner of each rivers.

The rear end of the first outer shell is provided with a first pipe part, a second pipe part and a third pipe part, wherein the first pipe part, the second pipe part and the third pipe part extend outwards, the third pipe part surrounds the raw water inlet channel, the first pipe part, the second pipe part and the third pipe part are sequentially and annularly arranged from outside to inside, the concentrated water discharge channel is surrounded between the first pipe part and the second pipe part, the purified water discharge channel is surrounded by the second pipe part and the raw water inlet pipe, and the concentrated water discharge channel, the purified water discharge channel and the raw water inlet channel are sequentially and annularly arranged from outside to inside; the second central pipe is connected with the second pipe part in a sealing mode through a fifth sealing ring; the raw water inlet pipe is connected with the raw water inlet channel in a sealing mode through a sixth sealing ring. The structure is beneficial to sealing the flow channels of all water flows, avoids the phenomenon of water mixing, saves the space and the volume occupied by all the channels and ensures that the distribution of the flow channels is more reasonable.

More preferably, the cap portion and the tube may be integrally formed to facilitate assembly and disassembly.

Preferably, the device further comprises an air bag which is arranged in the aftertreatment cavity and is arranged in a space inside the second outer shell and outside the raw water inlet pipe. The aftertreatment filter element is arranged at the front end of the aftertreatment cavity, and the air bag is arranged at the rear end of the aftertreatment cavity.

Preferably, the concentrated water device further comprises a flushing combination valve, and the flushing combination valve is connected with an outlet of the concentrated water discharge channel. When the flushing combination valve is opened, the enriched concentrated water is discharged from the concentrated water discharge channel.

Preferably, the system further comprises a booster pump and a water inlet valve, wherein the booster pump is connected with an inlet of the raw water inlet channel, and the water inlet valve is connected with the booster pump. During the use, the water intaking valve controls opening and stopping of raw water injection, the booster pump is the pressure boost in to composite filter, and the raw water gets into the RO membrane after leading filtration, utilizes the pressure boost of booster pump to be greater than the osmotic pressure to with heavy metal ion enrichment, and make the water purification after the filtration get into the post-treatment filter core in the filtration.

Preferably, the water purifier further comprises a check valve, and an outlet of the purified water discharge channel is connected with the check valve through a pipeline. The outer cavity is internally and directly communicated with the post-treatment cavity, and the check valve is arranged at an outlet, so that the structure between the post-treatment filter element and the RO membrane is simpler.

Preferably, the washing device further comprises a pressure switch, the pressure switch is connected with the check valve, and the pressure switch is electrically connected with the water inlet valve and the washing combined valve; when the pressure detected by the pressure switch exceeds a preset threshold value, the pressure switch is disconnected, and the water inlet valve is closed.

When a user purifies water by using the composite filter element, the water inlet valve is opened, raw water enters the raw water inlet channel through the pressurization of the booster pump, and the water is discharged from the purified water discharge channel after being filtered by the post-treatment filter element for the user to use; when a user stops using water, the purified water is accumulated in the post-treatment filter element, the air bag is continuously compressed, the pressure at the pressure switch is increased, when the pressure exceeds a preset threshold value, the pressure switch is switched off, the water inlet valve is closed, the air bag stops compressing, at the moment, the pressure in the post-treatment cavity is higher than the pressure in the outer cavity, the check valve prevents the water from being discharged from the water inlet discharge channel, and therefore the purified water is pressed into the RO membrane from the post-treatment cavity under the pressure, and the RO membrane is soaked in the purified water; and the concentrated water passes through the flushing combination valve and then is discharged from the concentrated water discharge channel.

Drawings

FIG. 1 is a schematic view showing the construction of an RO membrane water purifier of the background art;

FIG. 2 is a schematic cross-sectional view of a RO membrane water purifier of the related art;

FIG. 3 is a schematic view of the direction of water flow of the composite cartridge of example 1, wherein the direction of the black arrows indicates the direction of water flow;

FIG. 4 is an enlarged view of the front end of the composite filter element shown in example 1;

FIG. 5 is an enlarged structural view of the rear end of the composite filter element shown in example 1;

FIG. 6 is a schematic view of the construction of the cartridge according to example 2;

FIG. 7 is a schematic cross-sectional view of an outer core of the composite core of example 2;

FIG. 8 is a schematic cross-sectional view of an inner core of the composite filter element of example 2;

FIG. 9 is a schematic view showing a piping connection structure of the composite filter element shown in example 2;

FIG. 10 is an enlarged view of the front end of the composite filter element shown in example 2;

fig. 11 is an enlarged view of the rear end of the composite filter element shown in example 2.

Detailed Description

The technical solution of the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

Example 1

A composite filter cartridge, as shown with reference to fig. 3, comprising:

an outer filter element, which comprises a cylindrical first outer shell 110, an RO membrane 111, an upper cover 120 and a filter element tube 140, wherein the front end of the first outer shell 110 is hermetically connected with the upper cover 120; a raw water inlet channel 131, a concentrated water discharge channel 133 and a purified water discharge channel 132 are arranged at the rear end of the first outer shell 110; the filter element tube 140 comprises a tube body 141, the tube body 141 is sleeved in the first outer shell body 110, an outer cavity is formed between the first outer shell body 110 and the filter element tube 140, and the RO membrane 111 is columnar and is arranged in the outer cavity; the end face of the rear end of the RO membrane 111 communicates with the concentrated water discharge passage 133, and the post-treatment chamber communicates with the purified water discharge passage 132;

an inner filter element disposed within the filter element tube 140; the inner filter element comprises a cylindrical second outer shell 210 and a raw water inlet pipe 220, two ends of the second outer shell 210 are closed, and the second outer shell 210 is partitioned into a pretreatment cavity and a post-treatment cavity in the axial direction; a pretreatment filter element 231 is arranged in the pretreatment cavity, and a post-treatment filter element 241 is arranged in the post-treatment cavity; the raw water inlet pipe 220 is communicated with the raw water inlet passage 131, the raw water inlet pipe 220 penetrates through the post-treatment chamber from the rear end of the first outer shell 110 to be communicated with the pre-treatment chamber, and the pre-treatment chamber is communicated with the front end of the outer cavity; the inner side of the rear end of the RO membrane 111 communicates with the aftertreatment chamber.

Referring to fig. 4 to 5, a first through hole 142b is formed in the tube body 141 of the filter element tube 140, a fifth through hole 215 communicated with the first through hole 142b is formed at the rear end of the second outer case 210, a third sealing ring 214a is further disposed between the tube body 141 of the filter element tube 140 and the second outer case 210, and the third sealing ring 214a seals the first through hole 142b and the end surface of the rear end of the RO membrane 111, so that a sealed passage is formed between the first through hole 142b and the fifth through hole 215; the third sealing ring 214a, the first outer shell 110, the second outer shell 210 and the end surface of the rear end of the RO membrane 111 enclose a second flow channel cavity 280, and the second flow channel cavity 280 is communicated with the concentrated water discharge channel 133.

The cartridge tube 140 further includes a cap 142, the cap 142 covers an end surface of the rear end of the RO membrane 111, and the cap 142 is respectively connected to the tube 141 and the first outer casing 110 in a sealing manner, and encloses the outer cavity with the first outer casing 110 and the tube 141; the capping part 142 is provided with a second through hole 142a, and the rear end of the outer cavity is communicated with the concentrated water discharge passage 133 through the second through hole 142 a.

The pretreatment device further comprises a first central pipe 232, wherein the first central pipe 232 is arranged in the pretreatment cavity; the wall of the first central tube 232 is provided with a through hole; the pretreatment filter element 231 is columnar and is sleeved outside the side surface of the first central tube 232, the pretreatment filter element 231 comprises a first end close to the aftertreatment cavity and a second end far away from the aftertreatment cavity in the axial direction, a first sealing end cover 233 and a second sealing end cover 234 are arranged on the first end and the second end, the first sealing end cover 233 seals the first end and the first central tube 232, the second sealing end cover 234 seals the second end, and the second sealing end cover 234 is connected with the second outer shell 210 in a sealing manner; the outer side surface of the pretreatment filter element 231 is exposed to the pretreatment chamber.

The inner side of the upper cover 120 is further provided with a sealing rim 252 extending inwards from the inner side of the upper cover 120, the sealing rim 252 is annular, the first central tube 232 is inserted into the sealing rim 252, and the sealing rim 252 seals the orifice of the first central tube 232; a third through hole 232a is formed in a part of the pipe wall of the first center pipe 232 extending out of the second sealing end cover 234, the upper cover 120, the second sealing end cover 234 and a part of the second outer shell 210 form a first flow passage cavity 180, and the first flow passage cavity 180 is communicated with the first center pipe 232 through the third through hole 232 a; a fourth through hole 211 is formed in part of the second outer case 210, a second sealing ring 213a is disposed between the second outer case 210 and the tube body 141 of the filter core tube 140, a slit is disposed between the upper cap 120 and the filter core tube 140, the slit is communicated with the fourth through hole 211, and a sealing passage is formed between the fourth through hole 211 and the slit by the second sealing ring 213 a.

The upper cap 120 is provided with an annular flange 125 extending inward, and an L-shaped channel is defined between the flange 125 and the body 141 of the filter element tube 140 and the slit.

A seventh sealing ring 151 is disposed between the front end of the RO membrane 111 and the first outer case 110, the inner side surface of the RO membrane 111 is tightly attached to the outer side surface of the tube 141, and the L-shaped channel is communicated with the end surface of the front end of the RO membrane 111.

A second center tube 242, the second center tube 242 disposed within the aftertreatment cavity; a through hole is formed in the side surface of the second center pipe 242; the post-treatment filter element 241 is columnar and is sleeved outside the side surface of the second central tube 242; the end faces of the two ends of the post-treatment filter element 241 are respectively provided with a third sealing end cap 243, the third sealing end caps 243 respectively seal the end faces of the two ends of the post-treatment filter element 241, and the outer side face of the post-treatment filter element 241 is exposed in the post-treatment cavity; the second central pipe 242 is sleeved outside the raw water inlet pipe 220, one end of the first central pipe 232 is connected with the raw water inlet pipe 220 in a sealing manner, and the other end of the second central pipe 242 penetrates through the second outer shell 210 and is connected with the purified water discharge channel 132.

A sealing gasket 244 is arranged between the third sealing end cap 243 close to the rear end of the first outer shell 110 and the second outer shell 210; a third sealing end cap 243, which is far from the rear end of the first outer case 110, is connected to the raw water inlet pipe 220 and seals the one end of the second center pipe 242.

The rear end of the first outer shell 110 is provided with a first pipe part, a second pipe part and a third pipe part which enclose the raw water inlet channel 131, the first pipe part, the second pipe part and the third pipe part are sequentially and annularly arranged from outside to inside, the concentrated water outlet channel 133 is enclosed between the first pipe part and the second pipe part, the purified water outlet channel 132 is enclosed between the second pipe part and the raw water inlet pipe 220, and the concentrated water outlet channel 133, the purified water outlet channel 132 and the raw water inlet channel 131 are sequentially and annularly arranged from outside to inside; the second central pipe 242 is connected with the second pipe part in a sealing way through a fifth sealing ring; the raw water inlet pipe 220 is connected with the raw water inlet passage 131 in a sealing manner through a sixth sealing ring.

The composite filter element provided by the embodiment 1 has the following beneficial effects:

1. untreated raw water enters the raw water inlet pipe from the raw water inlet channel, flows into the pretreatment cavity, is subjected to pre-filtration treatment by the pretreatment filter element 231, and can generally filter colloidal impurities and particles with the diameter larger than 5 microns in the raw water; the pre-filtered water flows from the front treatment cavity to the front end of the outer cavity and flows into the RO membrane to filter out impurities such as heavy metal ions in the water flow, the purified water treated by the RO membrane enters the post-treatment cavity from the first through hole, and is filtered again by the post-treatment filter element, so that bacteria in the water are reduced, the taste is improved, and the purified water treated by the post-treatment filter element is discharged from the purified water discharge channel; and the concentrated water (water enriched with more impurities) treated by the RO membrane is discharged from the concentrated water discharge channel; therefore, the outer filter element and the inner filter element can realize multi-stage filtration of purified water;

2. the pretreatment filter element 231 and the post-treatment filter element are integrated in the inner filter element, and the pretreatment cavity and the post-treatment cavity are enclosed by the second outer shell, so that the use of a plastic shell is reduced; the raw water inlet pipe penetrates through the post-treatment cavity to be communicated with the pre-treatment cavity, so that the overall structure of the inner filter element is more compact, water flows sequentially through the pre-treatment filter element 231, the RO membrane and the post-treatment filter element, a water flow channel skillfully utilizes gaps among all cavities, the layout is reasonable, the occupied space in the water path circulation process is smaller, and the miniaturization of a product is facilitated;

Example 2

A composite filter element, as shown with reference to fig. 6, comprising:

an outer filter element 100, wherein the outer filter element 100 comprises a cylindrical first outer shell 110, an RO membrane 111, an upper cover 120 and a filter element tube 140, and for convenience of description, one end of the cylindrical composite filter element is referred to as a front end, and the other end is referred to as a rear end; the front end of the first outer housing 110 is hermetically connected with the upper cover 120; a raw water inlet channel 131, a concentrated water discharge channel 133 and a purified water discharge channel 132 are arranged at the rear end of the first outer shell 110; the filter element tube 140 comprises a tube body 141, the tube body 141 is sleeved in the first outer shell body 110, an outer cavity is formed between the first outer shell body 110 and the filter element tube 140, and the RO membrane 111 is columnar and is arranged in the outer cavity; the end face of the rear end of the RO membrane 111 communicates with the concentrated water discharge passage 133, and the post-treatment chamber communicates with the purified water discharge passage 132;

an inner filter element 200, the inner filter element 200 being disposed within the filter element tube 140; the inner filter element 200 comprises a cylindrical second outer shell 210 and a raw water inlet pipe 220, two ends of the second outer shell 210 are closed, and the second outer shell 210 is partitioned into a pretreatment cavity and a post-treatment cavity in the axial direction; a pretreatment filter element 231 is arranged in the pretreatment cavity, and a post-treatment filter element 241 is arranged in the post-treatment cavity; the raw water inlet pipe 220 is communicated with the raw water inlet passage 131, the raw water inlet pipe 220 penetrates through the post-treatment chamber from the rear end of the first outer shell 110 to be communicated with the pre-treatment chamber, and the pre-treatment chamber is communicated with the front end of the outer cavity; the inner side surface of the rear end of the RO membrane is communicated with the aftertreatment cavity; the aftertreatment chamber communicates with the clean water discharge passage 132.

Referring to fig. 10 and 11, the cartridge tube 140 further includes a cap 142, the cap 142 covers an end surface of the rear end of the RO membrane 111, and the cap 142 is hermetically connected to the tube 141 and the first outer casing 110; the capping part 142 is provided with a second through hole 142a, and the outer cavity is communicated with the concentrated water discharge passage 133 through the second through hole 142 a.

The cap 142 and the tube 141 may be integrally formed to reduce the number of parts, thereby facilitating assembly and fixation.

A first through hole 142b is formed in the tube body 141 of the filter element tube 140, and the outer cavity is communicated with the post-treatment cavity through the first through hole 142 b.

The pretreatment filter element 231 is made of PP cotton and carbon fiber composite fibers, and the post-treatment filter element 241 is made of carbon fiber materials.

Referring to fig. 8, a first central tube 232 is further included, and the first central tube 232 is disposed in the pretreatment chamber; the wall of the first central tube 232 is provided with a through hole; the pretreatment filter element 231 is columnar and is sleeved outside the side surface of the first central tube 232, the pretreatment filter element 231 comprises a first end close to the aftertreatment cavity and a second end far away from the aftertreatment cavity in the axial direction, a first sealing end cover 233 and a second sealing end cover 234 are arranged at the first end and the second end, the first sealing end cover 233 seals the first end and the first central tube 232, the second sealing end cover 234 is connected with the second outer shell 210, and a sealing gasket is arranged between the second sealing end cover 234 and the second outer shell 210; the outer side surface of the pretreatment filter element 231 is exposed to the pretreatment chamber. With the structure, after flowing into the pretreatment chamber through the raw water inlet pipe 220, water enters the pretreatment filter element 231 from the side surface of the pretreatment filter element 231 for filtration, then enters the first central pipe 232 from the through hole, and enters the outer cavity from the first central pipe 232.

The handle part 250 is in a cover shape, the handle part 250 comprises an outer edge 251, and the outer edge 251 is connected with the upper cover 120; the inner side of the handle part 250 is also provided with a sealing edge 252 extending inwards from the inner side of the handle part 250, the sealing edge 252 is annular, the first central tube 232 is inserted into the sealing edge 252, and the sealing edge 252 seals the first central tube 232; a third through hole 232a is formed in a part of the pipe wall of the first center pipe 232 extending out of the second sealing end cover 234, the handle portion 250, the second sealing end cover 234 and a part of the second outer shell 210 form a first flow passage cavity, and the first flow passage cavity is communicated with the first center pipe 232 through the third through hole 232 a; a fourth through hole 211, and a first positioning groove 212 and a second positioning groove 213 which are respectively arranged in front of and behind the fourth through hole 211 are formed in the second housing 210, and the first positioning groove 212 and the second positioning groove 213 are annular and are arranged along the side surface of the second housing 210; a slit is arranged between the upper cover 120 and the filter element tube 140, and the slit is communicated with the fourth through hole 211; first and second sealing rings are installed in the first and second positioning grooves 212 and 213, and are disposed between the filter element tube 140 and the second outer case 210 to seal the gap between the fourth through hole 211 and the slit. The water filtered by the pretreatment filter element 231 flows into the first flow channel cavity from the third through hole 232a of the first central tube 232, flows out through the fourth through hole 211, and flows into the slit under the sealing of the first sealing ring and the second sealing ring, so that the first central tube 232 is communicated with the front end of the outer cavity.

A third sealing ring is arranged between the front end of the RO membrane 111 and the first outer shell 110. The structure enables water to flow into the front end of the outer cavity, then enter the RO membrane 111, and be further filtered under the action of the applied pressure.

Referring to fig. 9, the rear housing further includes an inner filter element lower cover 260, and the inner filter element lower cover 260 covers the rear end of the second housing 210, so that the rear processing chamber forms a closed chamber; a fifth through hole 215 communicated with the first through hole 142b is formed at the rear end of the second outer shell 210, and the fifth through hole 215 enables the aftertreatment cavity to be communicated with the outer cavity through the first through hole 142 b; a third positioning groove 214 is further formed between the fifth through hole 215 and the inner filter element lower cover 260, and the third positioning groove 214 is annular and is arranged along the side surface of the second outer shell 210; a third sealing ring is disposed in the third positioning groove 214, and the third sealing ring is disposed between the filter element tube 140 and the second outer housing 210, so that the fifth through hole 215 and the second through hole 142a are sealed; the second through hole 142a, the first outer case 110 and the inner cartridge lower cover 260 form a second flow path chamber, which communicates with the concentrated water discharge passage 133. The structure leads the concentrated water and the clean water treated by the RO membrane 111 to be led out along different water channel channels.

Referring to FIG. 8, a second center tube 242 is also included, the second center tube 242 being disposed within the aftertreatment cavity; a through hole is formed in the side surface of the second center pipe 242; the post-treatment filter element 241 is columnar and is sleeved outside the side surface of the second central tube 242, and the outer side surface of the post-treatment filter element 241 is exposed in the post-treatment cavity; the second central pipe 242 is sleeved outside the raw water inlet pipe 220, the second central pipe 242 penetrates through the inner filter element lower cover 260 to be connected with the purified water discharge channel 132, and a fourth sealing ring is arranged between the second central pipe 242 and the inner filter element lower cover 260; the second central pipe 242 is connected with the clean water discharge channel 132 in a sealing manner through a fifth sealing ring; and third sealing end covers are respectively arranged at two ends of the post-treatment filter element 241. The structure enables the clean water treated by the RO membrane 111 to enter the post-treatment chamber, enter the second central tube 242 from the outer side surface of the post-treatment filter element 241, and be discharged along the clean water discharge channel 132.

Also includes a gasbag 270, the gasbag 270 is disposed in the after-treatment chamber and is disposed in the space inside the second outer shell 210 and outside the raw water inlet pipe 220. The aftertreatment filter element 241 is disposed at a front end of the aftertreatment chamber, and the air cell 270 is disposed at a rear end of the aftertreatment chamber.

The concentrated water discharge channel 133, the purified water discharge channel 132, and the raw water inlet channel 131 are sequentially and annularly arranged from outside to inside; in the axial direction, the inlet of the raw water inlet passage 131 is higher than the outlet of the concentrated water discharge passage 133, and the outlet of the concentrated water discharge passage 133 is higher than the outlet of the purified water discharge passage 132.

Referring to fig. 7 and 8, the outer filter element 100 and the inner filter element 200 are detachably connected, and the outer filter element 100 and the inner filter element 200 are in interference fit with each other through the first, second, and third sealing rings. When the RO membrane is installed, the front end of the RO membrane is sleeved with the seventh sealing ring 151, and then the RO membrane is inserted into the outer cavity, and the rear end of the RO membrane abuts against the cover sealing part 142; the first sealing ring, the second sealing ring and the third sealing ring are sleeved in each positioning groove on the outer side surface of the second outer shell 210, the inner filter element 200 is inserted into the filter element pipe 140 of the outer filter element 100, the raw water inlet pipe 220 of the inner filter element 200 is inserted into the raw water inlet channel 131, and the pipe orifice of the raw water inlet pipe 220 is in sealing connection with the raw water inlet channel 131; the second central tube 242 is hermetically connected with the clean water discharge channel 132; the upper cap 120 is coupled to the first outer case 110, and the handle part 150 is hermetically coupled to the upper cap 120. Through the arrangement, the inner filter element 200 and the outer filter element 100 can be conveniently detached and connected, the average service life of money in the inner filter element 200, the post-treatment filter element and the air bag is about 1 year, the RO membrane filter material has higher cost and longer service life and can be replaced once in 2-3 years, so that a user can reasonably replace the filter material according to the actual use condition, the water quality condition and the like, and the waste caused by replacing all the filter materials at one time is avoided.

The upper cover 120 is a hollow annular cover body, and the second outer casing 210 of the inner filter element 200 passes through the hollow annular cover body to be connected with the filter element pipe 140; the upper cover 120 includes an annular protruding edge portion extending toward the inner side of the annular cover body, and an L-shaped channel is defined between the protruding edge portion and the slit and between the protruding edge portion and the tube body of the filter element tube. Water enters the front end of the RO membrane 111 from the L-shaped channel.

The upper cover 120 further includes an annular fixing portion extending to the outside of the annular cover body, and the annular fixing portion is connected with the second outer housing 210 by the first sealing ring in an interference fit manner; the fixing portion is in a hook shape, and the outer edge 251 of the handle portion 250 is connected with the fixing portion in a matching manner.

Raw water inlet channel 131 with through sealing washer sealing connection between the raw water inlet tube 220, second center tube 242 with through sealing washer sealing connection between the water purification discharge passage 132, avoid the cluster water and the problem of leaking.

Referring to the schematic of the pipeline connection structure in fig. 9, a flushing combination valve 330 is further included, and the flushing combination valve 330 is connected to the outlet of the concentrated water discharge channel 133. When the flush combination valve 330 is opened, the enriched rich water is discharged from the rich water discharge channel 133.

The device further comprises a booster pump 311 and a water inlet valve 312, wherein the booster pump 311 is connected with an inlet of the raw water inlet channel 131, and the water inlet valve 312 is connected with the booster pump 311. During the use, the start-stop of water intaking valve 312 control raw water injection, booster pump 311 is to the pressurization in the composite filter core, and the raw water gets into RO membrane 111 after leading filtration, utilizes booster pump 311's pressure boost to be greater than the osmotic pressure, thereby with heavy metal ion enrichment to make the water purification after the filtration get into in the aftertreatment filter core 241 filtration.

And the water purifier further comprises a check valve 321, and an outlet of the purified water discharge channel 132 is connected with the check valve 321 through a pipeline. In the outer cavity with the aftertreatment chamber direct intercommunication, check valve 321 sets up in the exit position for the structure between aftertreatment filter element 241 and the RO membrane 111 is more succinct.

The pressure switch 322 is connected with the check valve 321, and the pressure switch 322 is electrically connected with the inlet valve 312 and the combined flushing valve 330; when the pressure detected by the pressure switch 322 exceeds a preset threshold, the pressure switch 322 is turned off and the fill valve 312 is closed.

When a user purifies water by using the composite filter element, the water inlet valve 312 is opened, raw water enters the raw water inlet channel 131 through the pressurization of the booster pump 311, and the water is discharged from the purified water discharge channel 132 after being filtered by the post-treatment filter element 241 for the user to use; when a user stops using water, purified water is accumulated in the post-treatment filter element 241, the air bag 270 is continuously compressed, the pressure at the pressure switch 322 is increased, when the pressure exceeds a preset threshold value, the pressure switch 322 is disconnected, the water inlet valve 312 is closed, the air bag 270 stops compressing, at the moment, the pressure in the post-treatment cavity is higher than the pressure in the outer cavity, the check valve 321 prevents water from being discharged from the water inlet discharge channel, and therefore the purified water under the pressure is pressed into the RO membrane 111 from the post-treatment cavity, and the RO membrane 111 is soaked in the purified water; and the concentrate passes through the flushing combination valve 330 and is discharged from the concentrate discharge passage 133.

1. untreated raw water enters the raw water inlet pipe from the raw water inlet channel, flows into the pretreatment cavity, is subjected to pre-filtration treatment by the pretreatment filter element, and can generally filter colloidal impurities and particles with the diameter larger than 5 microns in the raw water; the pre-filtered water flows from the front treatment cavity to the front end of the outer cavity and flows into the RO membrane to filter out impurities such as heavy metal ions in the water flow, the purified water treated by the RO membrane enters the post-treatment cavity from the first through hole, and is filtered again by the post-treatment filter element, so that bacteria in the water are reduced, the taste is improved, and the purified water treated by the post-treatment filter element is discharged from the purified water discharge channel; the concentrated water (water enriched with more impurities) treated by the RO membrane is discharged from the concentrated water discharge channel through the second through hole; therefore, the outer filter element and the inner filter element can realize multi-stage filtration of purified water;

2. the pretreatment filter element and the post-treatment filter element are integrated in the inner filter element, and the pretreatment cavity and the post-treatment cavity are enclosed by the second outer shell, so that the use of a plastic shell is reduced; the raw water inlet pipe passes through the post-treatment cavity and is communicated with the pre-treatment cavity, so that the whole structure of the inner filter element is more compact, the space occupied by the waterway circulation process is smaller, and the miniaturization of the product is facilitated;

3. because the front and rear treatment filter elements are directly assembled in the outer filter element, the independent shells of the front and rear treatment filter elements are omitted, and compared with the traditional product containing the front and rear treatment filter elements, the rejection rate of the plastic shell is reduced, and the harm to the environment is reduced;

4. because the inner filter element and the outer filter element are detachably connected, the RO membrane and the front and rear treatment filter elements are respectively arranged in the outer cavity and the second outer shell, and the outer filter element and the inner filter element can be respectively replaced according to different service lives in the use process, the filter material has longer service life, and the waste of the filter material is reduced; the RO membrane has high cost and long service life, can be replaced once in 2-3 years in use, and the service lives of the pretreatment filter element, the post-treatment filter element and the air bag of the inner filter element are about 1 year and can be replaced together;

5. the inner filter element can be directly inserted into the outer filter element, and the sealing is realized by the sealing ring and the handle part, so that the assembly is convenient; the product can directly use the outer shell of the RO filter element commonly used in the prior art as the outer shell of the outer filter element, and the RO membrane is arranged in the outer shell, so that the product is convenient to refit and has wide market prospect;

6. concentrated water enriched in the RO membrane can be discharged through a concentrated water discharge channel, so that residual is prevented from being accumulated in the composite filter element, and pollution to purified water filtered by the RO membrane is avoided;

7. because the RO membrane is soaked in the purified water, when the booster pump stops working, the condition that concentrated water permeates into the post-treatment cavity through the RO membrane does not exist, the problem of head cup water is solved, and particularly when the purified water amount taken by a user each time is less, the problem that the quality of water discharged from the purified water discharge channel when the system is just started cannot reach the standard can be avoided;

8. the pressure switch is adopted to control the operation of the product system, automatic control is realized according to air pressure, and the use is convenient for users.

Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. A composite filter element, comprising:

the filter comprises an outer filter element and a filter element, wherein the outer filter element comprises a cylindrical first outer shell, an RO (reverse osmosis) membrane, an upper cover and a filter element pipe, and the front end of the first outer shell is hermetically connected with the upper cover; the rear end of the first outer shell is provided with a raw water inlet channel, a concentrated water discharge channel and a purified water discharge channel; the filter element pipe comprises a pipe body, the pipe body is sleeved in the first outer shell, an outer cavity is formed between the first outer shell and the filter element pipe, and the RO membrane is columnar and arranged in the outer cavity; the end surface of the rear end of the RO membrane is communicated with the concentrated water discharge channel, and the post-treatment cavity is communicated with the purified water discharge channel;

2. The composite filter element according to claim 1, wherein a first through hole is formed in the tube body of the filter element tube, a fifth through hole communicated with the first through hole is formed in the rear end of the second outer shell, and a third sealing ring is further arranged between the tube body of the filter element tube and the second outer shell and seals the first through hole and the end surface of the rear end of the RO membrane, so that a sealed passage is formed between the first through hole and the fifth through hole; and the third sealing ring, the first outer shell, the second outer shell and the end surface of the rear end of the RO membrane enclose a second flow channel cavity, and the second flow channel cavity is communicated with the concentrated water discharge channel.

3. The composite filter element according to claim 1, wherein the filter element tube further comprises a cover part, the cover part covers the end face of the rear end of the RO membrane, the cover part is respectively connected with the tube body and the first outer shell body in a sealing manner, and the outer cavity is enclosed by the first outer shell body and the tube body; the sealing cover part is provided with a second through hole, and the rear end of the outer cavity is communicated with the concentrated water discharge channel through the second through hole.

4. The composite filter element of claim 1, further comprising a first center tube disposed within the pre-treatment chamber; the pipe wall of the first central pipe is provided with a through hole; the pretreatment filter element is columnar and sleeved outside the side surface of the first central tube, the pretreatment filter element comprises a first end close to the aftertreatment cavity and a second end far away from the aftertreatment cavity in the axial direction, a first sealing end cover and a second sealing end cover are arranged on the first end and the second end, the first sealing end cover seals the first end and the first central tube, the second sealing end cover seals the second end, and the second sealing end cover is connected with the second outer shell in a sealing manner; the outer side surface of the pretreatment filter element is exposed in the pretreatment cavity.

5. The composite filter element according to claim 4, wherein the inner side of the upper cover is further provided with a sealing rim extending inwards from the inner side of the upper cover, the sealing rim is annular, the first central tube is inserted into the sealing rim, and the sealing rim seals a nozzle of the first central tube; a third through hole is formed in the part of the pipe wall of the first central pipe, which extends out of the second sealing end cover, a first flow passage cavity is formed by the upper cover, the second sealing end cover and part of the second outer shell, and the first flow passage cavity is communicated with the first central pipe through the third through hole; and a fourth through hole is formed in part of the second outer shell, a second sealing ring is arranged between the second outer shell and the tube body of the filter element tube, a slit is formed between the upper cover and the filter element tube and is communicated with the fourth through hole, and a sealing channel is formed between the fourth through hole and the slit by the second sealing ring.

6. The composite filter element according to claim 5, wherein the upper cover is provided with an annular flange portion extending inward, and an L-shaped channel is defined between the flange portion and the slit and between the flange portion and the tubular body of the filter element tube.

7. The composite filter element according to claim 6, wherein a seventh seal ring is arranged between the front end of the RO membrane and the first outer shell, the inner side surface of the RO membrane is tightly attached to the outer side surface of the tube body, and the L-shaped channel is communicated with the end surface of the front end of the RO membrane.

8. The composite filter element of claim 1, further comprising a second center tube disposed within the aftertreatment cavity; a through hole is formed in the side surface of the second central pipe; the post-treatment filter element is columnar and is sleeved outside the side surface of the second central tube; the end surfaces of two ends of the post-treatment filter element are respectively provided with a third sealing end cover, the third sealing end covers respectively seal the end surfaces of two ends of the post-treatment filter element, and the outer side surface of the post-treatment filter element is exposed in the post-treatment cavity; the second center tube is sleeved outside the raw water inlet tube, one end of the first center tube is connected with the raw water inlet tube in a sealing mode, and the other end of the second center tube penetrates through the second outer shell and is connected with the purified water discharge channel.

9. The composite filter element of claim 8, wherein a sealing gasket is disposed between a third seal end cap proximate the rear end of the first outer housing and the second outer housing; keep away from the third end cover of the rear end of first shell body with raw water inlet pipe connects, and seals the second center tube one end.

10. The composite filter element according to any one of claims 1 to 9, wherein a rear end of the first outer shell is provided with a first pipe part, a second pipe part and a third pipe part which enclose the raw water inlet channel, the first pipe part, the second pipe part and the third pipe part are sequentially and annularly arranged from outside to inside, the first pipe part and the second pipe part enclose the concentrated water discharge channel, the second pipe part and the raw water inlet pipe enclose the purified water discharge channel, and the concentrated water discharge channel, the purified water discharge channel and the raw water inlet channel are sequentially and annularly arranged from outside to inside; the second central pipe is connected with the second pipe part in a sealing mode through a fifth sealing ring; the raw water inlet pipe is connected with the raw water inlet channel in a sealing mode through a sixth sealing ring.