Filter element and water purifying device comprising same

Abstract

The invention relates to the technical field of water purification equipment, in particular to a filter element and a water purification device comprising the filter element. The filter element comprises a shell, a water permeable pipe, a reverse osmosis membrane and a hollow pipe, wherein a raw water opening, a purified water opening and a waste water opening are formed in the shell; the water permeable pipe is located in the shell and forms a containing cavity with the inner wall of the shell; the reverse osmosis membrane is located in the containing cavity and wound on the water permeable pipe, the water inlet end of the reverse osmosis membrane is communicated with the raw water opening, the concentrated water end of the reverse osmosis membrane is communicated with the waste water opening, the hollow pipe is located in the water permeable pipe, and a first gap flow channel is formed between the outer wall of the hollow pipe and the inner wall of the water permeable pipe. And a through hole communicated with the first gap flow channel is formed in the other end of the hollow pipe. When concentration permeation occurs in the reverse osmosis membrane, the diffusion path of soluble solids is prolonged by the first gap flow channel, and the soluble solids are prevented from quickly diffusing into the hollow tube, so that the TDS value of'head cup water 'output by the filter element again does not exceed the standard.

Description

Technical Field

[0001] The present invention relates to the technical field of water purification equipment, and in particular to a filter element and a water purification device comprising the filter element. Background Art

[0002] Water purifiers usually use reverse osmosis filters to produce purified water. Under a certain pressure, a portion of the water molecules in the raw water can pass through the reverse osmosis membrane to form purified water, while the other portion of the water in the raw water and impurities such as inorganic salts, heavy metal ions, organic matter, colloids, bacteria, viruses, etc. in the water cannot pass through the reverse osmosis membrane to form concentrated water.

[0003] After the water purifier has been in standby mode for a long time, the soluble solids in the concentrated water on the reverse osmosis membrane side of the filter element will penetrate into the purified water side, increasing the soluble solids in the purified water of the filter element. When the reverse osmosis filter element outputs purified water again, the TDS value of the "first cup of water" is high, which reduces the quality of the purified water output and affects the user's drinking water health, resulting in a poor user experience.

[0004] Accordingly, the art needs a new filter element to solve the above problems. Summary of the invention

[0005] In order to solve the above problems in the prior art, that is, to solve the problem that the TDS value of the "first cup of water" output by the existing reverse osmosis filter element is too high.

[0006] In a first aspect, the present invention provides a filter element, which includes: a shell, on which a raw water inlet, a clean water inlet and a waste water inlet are arranged; a water permeable pipe, which is located in the shell and forms a containing chamber with the inner wall of the shell; a reverse osmosis membrane, which is located in the containing chamber and is wound on the water permeable pipe, the water inlet end of the reverse osmosis membrane is connected with the raw water inlet, and the concentrated water end of the reverse osmosis membrane is connected with the waste water inlet; and a hollow pipe, which is located in the water permeable pipe; wherein a first gap flow channel is formed between the outer wall of the hollow pipe and the inner wall of the water permeable pipe, one end of the hollow pipe is connected with the clean water inlet, and the other end of the hollow pipe is provided with a through hole connected with the first gap flow channel.

[0007] In the preferred technical solution of the above-mentioned filter element, the filter element further comprises a flow channel support strip located in the first gap flow channel, and the flow channel support strip is clamped and fixed by the outer wall of the hollow tube and the inner wall of the water-permeable tube.

[0008] In the preferred technical solution of the above-mentioned filter element, the flow channel support strip is fixed on the hollow tube, and the flow channel support strip is distributed in a threaded shape along the axial direction of the hollow tube.

[0009] In the preferred technical solution of the above-mentioned filter element, the flow channel support strip is fixed on the hollow tube, and there are multiple flow channel support strips, which are evenly spaced along the circumference of the hollow tube, and are arranged parallel to the axis of the hollow tube.

[0010] In the preferred technical solution of the above-mentioned filter element, the hollow tube further includes an elastic sheet, one end of the elastic sheet is fixed in the hollow tube, and the other end of the elastic sheet covers the through hole.

[0011] In the preferred technical solution of the above-mentioned filter element, the water-permeable pipe has a water-permeable hole, and the through hole is arranged to avoid the water-permeable hole.

[0012] In the preferred technical solution of the above-mentioned filter element, the distance between the outer wall of the hollow tube and the inner wall of the water-permeable tube is set to 1 mm to 8 mm.

[0013] In the preferred technical solution of the filter element described above, a second gap flow channel is formed between the outer wall of the reverse osmosis membrane and the inner wall of the shell, and the second gap flow channel is communicated with the raw water inlet.

[0014] In the preferred technical solution of the above-mentioned filter element, the filter element also includes a post-module, which is fixedly connected to the other end of the hollow tube, the water inlet end of the post-module is connected to the first gap flow channel, and the water outlet end of the post-module is connected to the through hole.

[0015] In a second aspect, the present invention further provides a water purification device, comprising the filter element described in any one of the above items.

[0016] It can be understood by those skilled in the art that the filter element of the present invention includes: a housing, a water permeable pipe, a reverse osmosis membrane and a hollow pipe. The housing is provided with a raw water inlet, a clean water inlet and a waste water inlet; the water permeable pipe is located in the housing and forms a containing chamber with the inner wall of the housing; the reverse osmosis membrane is located in the containing chamber and wound on the water permeable pipe, the water inlet end of the reverse osmosis membrane is connected to the raw water inlet, the concentrated water end of the reverse osmosis membrane is connected to the waste water inlet, the hollow pipe is located in the water permeable pipe, a first gap flow channel is formed between the outer wall of the hollow pipe and the inner wall of the water permeable pipe, one end of the hollow pipe is connected to the clean water inlet, and the other end of the hollow pipe is provided with a through hole connected to the first gap flow channel. Through such a setting, when concentration permeation occurs in the reverse osmosis membrane (i.e. the filter element stops producing water), the first gap flow channel extends the diffusion path of the soluble solids, preventing the soluble solids from quickly diffusing into the hollow tube. When the filter element outputs purified water again, the pure water in the hollow tube is output as the "first cup of water", thereby ensuring that the TDS value of the "first cup of water" output by the filter element does not exceed the standard, thereby improving the user experience.

[0017] Furthermore, the filter element further includes a flow channel support strip located in the first gap flow channel, and the outer wall of the hollow tube and the inner wall of the water-permeable tube clamp and fix the flow channel support strip. Through such an arrangement, on the one hand, the flow channel support strip facilitates stabilizing the hollow tube in the water-permeable tube, and on the other hand, the flow channel support strip separates the first gap flow channel, thereby increasing the diffusion path of the dissolved solids in the first gap flow channel.

[0018] Furthermore, the flow channel support strip is fixed on the hollow tube, and the flow channel support strip is distributed in a spiral shape along the axial direction of the hollow tube. Through such an arrangement, a spiral flow channel is formed in the first gap flow channel, which extends the diffusion path of the soluble solids and effectively blocks the diffusion of the soluble solids into the hollow tube.

[0019] Furthermore, the flow channel support strip is fixed on the hollow tube, the number of the flow channel support strip is multiple, the multiple flow channel support strips are evenly spaced and distributed along the circumference of the hollow tube, and the multiple flow channel support strips are arranged parallel to the axis of the hollow tube. Through such an arrangement, multiple parallel flow channels are formed in the first gap flow channel, which prolongs the diffusion path of the soluble solids and effectively blocks the diffusion of the soluble solids into the hollow tube.

[0020] Furthermore, the hollow tube also includes an elastic sheet, one end of which is fixed in the hollow tube, and the other end of which covers the through hole. With such an arrangement, when the filter element stops producing water, the elastic sheet covers the through hole under its own elastic action, directly blocking the diffusion of dissolved solids into the hollow tube through the through hole.

[0021] Furthermore, the water permeable pipe has a water permeable hole, and the through hole is arranged away from the water permeable hole. Through such an arrangement, when the filter element stops producing water, it is prevented that dissolved solids seep out of the water permeable hole of the water permeable pipe and directly expand into the through hole.

[0022] Furthermore, the distance between the outer wall of the hollow tube and the inner wall of the water-permeable tube is set to 1 mm to 8 mm. Through such a setting, on the one hand, the amount of water containing dissolved solids in the first gap flow channel is controlled to be smaller than the amount of clean water in the hollow tube to ensure that the TDS value does not exceed the standard when the filter element produces water again; on the other hand, the flow rate of clean water passing through the first gap flow channel is met to ensure the water production efficiency of the filter element.

[0023] Furthermore, a second gap flow channel is formed between the outer wall of the reverse osmosis membrane and the inner wall of the shell, and the second gap flow channel is connected to the raw water inlet. Through such a setting, on the one hand, the water inlet amount at the water inlet end of the reverse osmosis membrane is increased to ensure the water production efficiency; on the other hand, when the filter element stops producing water, the dissolved solids in the reverse osmosis membrane diffuse into the second gap flow channel, reducing the concentration of dissolved solids in the first gap flow channel.

[0024] Furthermore, the filter element further comprises a rear module, which is fixedly connected to the other end of the hollow tube, the water inlet end of the rear module is connected to the first gap flow channel, and the water outlet end of the rear module is connected to the through hole. Through such an arrangement, the water quality and taste of the filter element are improved.

[0025] In addition, the water purification device further provided by the present invention on the basis of the above technical solution has the technical effects possessed by the above filter element due to the adoption of the above filter element. Compared with the existing water purification device, the water purification device of the present invention outputs the "first cup of water" with better quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0027] Figure 1 1 is a schematic structural diagram of a filter element according to a first embodiment of the present invention;

[0028] Figure 2 is a structural schematic diagram of a second embodiment of the filter element of the present invention;

[0029] Figure 3 It is a structural schematic diagram of a preferred embodiment 1 of the hollow tube of the filter element of the present invention;

[0030] Figure 4 It is a structural schematic diagram of a preferred embodiment 2 of the hollow tube of the filter element of the present invention;

[0031] Figure 5 yes Figure 4 Schematic diagram of the cross section at AA in the middle;

[0032] Figure 6 It is a structural schematic diagram of a preferred embodiment 3 of the hollow tube of the filter element of the present invention.

[0033] List of reference numerals:

[0034] 1. Shell; 11. Clean water inlet; 12. Raw water inlet; 13. Waste water inlet; 14. First gap flow channel; 15. Second gap flow channel; 2. Reverse osmosis membrane; 3. Water-permeable pipe; 31. Water-permeable hole; 4. Hollow pipe; 41. Through hole; 42. Flow channel support bar; 421. Guide groove; 43. Elastic sheet; 5. Post-module. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0036] It should be noted that, in the description of the present invention, terms such as "upper", "lower", "inside", "outside", "top", "bottom" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely for the convenience of description and does not indicate or imply that a device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0037] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0038] Based on the problem of high TDS of the "first cup of water" output by the existing reverse osmosis filter element pointed out in the background technology, the present invention provides a filter element, which aims to prevent the clean water in the filter element from being contaminated by concentrated water by extending and limiting the diffusion path of soluble solids to the clean water. When the filter element outputs clean water again, it ensures that the TDS value of the "first cup of water" does not exceed the standard, thereby improving the user experience.

[0039] Specifically, Figure 1 to Figure 2 As shown, the filter element of the present invention comprises a housing 1, a water permeable pipe 3, a reverse osmosis membrane 2 and a hollow pipe 4. The housing 1 is provided with a raw water inlet 12, a purified water inlet 11 and a waste water inlet 13; the water permeable pipe 3 is located in the housing 1 and forms a containing chamber with the inner wall of the housing 1; the reverse osmosis membrane 2 is located in the containing chamber and is wound on the water permeable pipe 3, the water inlet end of the reverse osmosis membrane 2 is connected with the raw water inlet 12, the concentrated water end of the reverse osmosis membrane 2 is connected with the waste water inlet 13, the hollow pipe 4 is located in the water permeable pipe 3, a first gap flow channel 14 is formed between the outer wall of the hollow pipe 4 and the inner wall of the water permeable pipe 3, one end of the hollow pipe 4 is connected with the purified water inlet 11, and the other end of the hollow pipe 4 is provided with a through hole 41 connected with the first gap flow channel 14.

[0040] For example, Figure 1 to Figure 2As shown, the raw water inlet 12, the clean water inlet 11 and the waste water inlet 13 on the shell 1 are located at the bottom end of the shell 1. The water-permeable pipe 3 has a plurality of water-permeable holes 31, and the plurality of water-permeable holes 31 are evenly distributed on the side wall of the water-permeable pipe 3. The hollow pipe 4 is located in the water-permeable pipe 3 and the hollow pipe 4 is coaxially arranged with the water-permeable pipe 3, and an annular first gap flow channel 14 is formed between the outer wall of the hollow pipe 4 and the inner wall of the water-permeable pipe 3. The lower end of the hollow pipe 4 is connected with the clean water inlet 11, and a through hole 41 is provided on the side wall of the upper end of the hollow pipe 4. The first gap flow channel 14 is connected with the chamber in the hollow pipe 4 by means of the through hole 41 at the upper end of the hollow pipe 4.

[0041] Preferably, if Figure 1 As shown, the through hole 41 of the hollow tube 4 of the filter element of the present invention is arranged to avoid the water permeable hole 31 of the water permeable pipe 3.

[0042] For example, Figure 1 As shown, the through hole 41 of the hollow tube 4 of the filter element of the present invention is arranged at the upper end of the hollow tube 4 and away from the water permeable hole 31 of the water permeable tube 3. When the filter element stops producing water, the dissolved solids on one side of the reverse osmosis membrane 2 are prevented from directly extending into the hollow tube 4 through the through hole 41 of the hollow tube 4 when seeping out from the water permeable hole 31 of the water permeable tube 3.

[0043] It should be noted that, according to actual applications, those skilled in the art may set the number of through holes 41 to 2, or set the number of through holes 41 to 3 or more than 3, as long as the through holes 41 are kept away from the water purification outlet 11. Such flexible adjustment and change of the number of through holes 41 does not deviate from the principle and scope of the present invention, and should be limited within the protection scope of the present invention.

[0044] When the filter element produces water, the raw water enters the reverse osmosis membrane 2 of the filter element through the raw water port 12 to produce clean water. The clean water flows into the first gap flow channel 14 through the water permeable hole 31 on the water permeable pipe 3 and enters the chamber in the hollow pipe 4 through the through hole 41 at the upper end of the hollow pipe 4, and finally flows down to the clean water port 11 to output clean water. The concentrated water produced after the reverse osmosis membrane 2 is filtered flows out of the filter element through the waste water port 13. When the filter element stops producing water and continues for a period of time, the soluble solids in the concentrated water in the reverse osmosis membrane 2 diffuse into the first gap flow channel 14 through the water permeable hole 31 of the water permeable pipe 3 under the action of the concentration difference. The first gap flow channel 14 extends the diffusion stroke of the soluble solids and effectively reduces the diffusion rate of the soluble solids into the hollow pipe 4. When the filter element outputs clean water again, the pure water in the hollow pipe 4 is output as the "first cup of water", thereby ensuring that the TDS value of the "first cup of water" output by the filter element again does not exceed the standard, thereby improving the user experience.

[0045] Preferably, if Figure 1 to Figure 2 As shown, the distance between the outer wall of the hollow tube 4 of the filter element of the present invention and the inner wall of the water-permeable tube 3 is set to 1 mm to 8 mm.

[0046] For example, Figure 1 to Figure 2 As shown, the distance between the outer wall of the hollow tube 4 of the filter element of the present invention and the inner wall of the water-permeable tube 3 is set to 4 mm. On the one hand, the amount of water containing dissolved solids in the first gap flow channel 14 is controlled to be less than the amount of clean water in the hollow tube 4 to ensure that the TDS value does not exceed the standard when the filter element produces water again; on the other hand, the flow rate of clean water passing through the first gap flow channel 14 is met to ensure the normal water production efficiency of the filter element.

[0047] It should be noted that, according to actual applications, those skilled in the art may set the distance between the outer wall of the hollow tube 4 and the inner wall of the water-permeable tube 3 to 1 mm, or, may set the distance between the outer wall of the hollow tube 4 and the inner wall of the water-permeable tube 3 to 8 mm. Such flexible adjustment and change of the distance between the outer wall of the hollow tube 4 and the inner wall of the water-permeable tube 3 does not deviate from the principle and scope of the present invention, and shall be limited within the protection scope of the present invention.

[0048] Preferably, if Figure 1 to Figure 2 As shown, a second gap flow channel 15 is formed between the outer wall of the reverse osmosis membrane 2 and the inner wall of the shell 1 , and the second gap flow channel 15 is connected to the raw water inlet 12 .

[0049] On the one hand, when the raw water enters the second gap flow channel 15 through the raw water inlet 12, the raw water is filtered and produced inward from the circumference of the reverse osmosis membrane 2 at the same time, thereby ensuring the water production efficiency of the reverse osmosis membrane 2. On the other hand, when the filter element stops producing water, the dissolved solids in the reverse osmosis membrane 2 are diverted and diffused into the second gap flow channel 15, which relatively reduces the diffusion of dissolved solids into the first gap flow channel 14 and reduces the concentration of dissolved solids in the first gap flow channel 14.

[0050] Preferably, if Figure 2 As shown, the filter element of the present invention also includes a rear module 5, which is fixedly connected to the other end of the hollow tube 4, the water inlet end of the rear module 5 is connected to the first gap flow channel 14, and the water outlet end of the rear module 5 is connected to the through hole 41.

[0051] For example, Figure 2 As shown, the rear module 5 of the present invention is an activated carbon core, which is fixed at the upper end of the hollow tube 4 and is located in the water-permeable tube 3 together with the hollow tube 4. The outer wall of the activated carbon core is connected to the first gap flow channel 14. The activated carbon core has a hollow chamber (not shown in the figure), and one end of the hollow chamber is connected to the through hole 41 of the hollow tube 4.

[0052] When the filter element produces water again, the activated carbon core further absorbs and filters the dissolved solids in the water of the first gap flow channel 14 and improves the water quality and taste of the filter element.

[0053] It should be noted that, according to practical applications, those skilled in the art may set the post-module 5 to a composite structure of ppc and activated carbon core, or the post-module 5 may also be provided with a mineralized core to increase the beneficial minerals in the purified water. Such flexible adjustment and change of the specific structure of the post-module 5 does not deviate from the principle and scope of the present invention, and should be limited within the scope of protection of the present invention. Of course, it is preferred that the post-module 5 is an activated carbon core to reduce the preparation cost of the filter element. Due to the introduction of the post-module 5, it is necessary to increase the diameter of the water-permeable pipe 3 to accommodate the post-module 5. At the same time, the diameter of the hollow tube 4 is correspondingly increased so that more purified water can be stored in the hollow tube 4, further ensuring that the TDS value of the "first cup of water" of the filter element does not exceed the standard.

[0054] In addition, it should be noted that the through hole 41 of the hollow tube 4 of the filter element of the present invention is connected to the water outlet end of the activated carbon core. Relatively speaking, the clean water can be fully filtered in the activated carbon core, which increases the removal effect of the activated carbon core on the residual chlorine in the clean water, improves the taste of the clean water, and improves the utilization rate of the activated carbon core.

[0055] Preferably, if Figures 3 to 5 As shown, the filter element of the present invention further comprises a flow channel support bar 42 located in the first gap flow channel 14 , and the flow channel support bar 42 is clamped and fixed by the outer wall of the hollow tube 4 and the inner wall of the water-permeable tube 3 .

[0056] For example, Figure 1 to Figure 2 As shown, the flow channel support strip 42 is made of silicone. When installed, the flow channel support strip 42 is clamped and fixed by the outer wall of the hollow tube 4 and the inner wall of the water-permeable tube 3. In this way, the hollow tube 4 can be stably fixed in the water-permeable tube 3, improving the stability of the hollow tube 4 in the water-permeable tube 3. On the other hand, with the help of the flow channel support strip 42, the diffusion path of the water flow in the first gap flow channel 14 is extended, effectively blocking the diffusion of dissolved solids into the hollow tube 4.

[0057] In a first preferred embodiment, Figure 3 As shown, the flow channel support strip 42 of the present invention is fixed on the hollow tube 4 , and the flow channel support strip 42 is distributed in a threaded shape along the axial direction of the hollow tube 4 .

[0058] For example, Figure 3 As shown, the flow channel support strips 42 of the present invention are fixed in a thread-like distribution on the circumference of the hollow tube 4. Among them, thread-like guide grooves 421 are formed between the flow channel support strips 42.

[0059] When the installation is completed, the flow channel support strip 42 forms a threaded guide groove 421 in the first gap flow channel 14 , and the guide groove 421 is arranged opposite to the water permeable hole 31 of the water permeable pipe 3 .

[0060] When the filter element stops producing water and continues for a period of time, the soluble solids in the concentrated water in the reverse osmosis membrane 2 diffuse into the threaded guide groove 421 in the first gap flow channel 14 through the water permeable holes 31 of the water permeable pipe 3 due to the concentration difference. The threaded guide groove 421 increases the diffusion distance of the soluble solids and effectively reduces the diffusion rate of the soluble solids into the hollow tube 4.

[0061] In a second preferred embodiment, Figures 4 to 5 As shown, the flow channel support strip 42 of the present invention is fixed on the hollow tube 4, there are multiple flow channel support strips 42, the multiple flow channel support strips 42 are evenly spaced along the circumference of the hollow tube 4, and the multiple flow channel support strips 42 are all arranged parallel to the axis of the hollow tube 4.

[0062] For example, Figures 4 to 5 As shown, the top of the hollow tube 4 of the present invention is provided with a through hole 41. The hollow tube 4 is provided with 12 flow channel support bars 42 parallel to the axis of the hollow tube 4. The 12 flow channel support bars 42 are evenly spaced along the circumference of the hollow tube 4. Among them, three mutually adjacent flow channel support bars 42 form a U-shaped guide groove 421, wherein the outlet of the U-shaped guide groove 421 is close to the through hole 41. The guide groove 421 is arranged opposite to the water permeable hole 31 on the water permeable pipe 3.

[0063] When the filter element stops producing water and this continues for a period of time, the soluble solids in the concentrated water in the reverse osmosis membrane 2 diffuse into the U-shaped guide groove 421 in the first gap flow channel 14 through the water permeable holes 31 of the water permeable pipe 3 due to the concentration difference. The U-shaped guide groove 421 increases the diffusion distance of the soluble solids and effectively reduces the diffusion rate of the soluble solids into the hollow tube 4.

[0064] It should be noted that, according to practical applications, those skilled in the art may connect the above-mentioned U-shaped guide grooves 421 end to end to form a continuous groove structure.

[0065] In addition, it should be noted that the practical guide groove 421 of the present invention is not limited to the above-mentioned spiral and U-shaped structures. According to actual applications, technicians in this field can design the flow channel support bar 42 into an S-shaped structure, or the flow channel support bar 42 can also be designed into a Z-shaped structure, etc. This flexible adjustment and change of the specific structure of the flow channel support bar 42 to form the guide groove 421 does not deviate from the principle and scope of the present invention, and should be limited within the protection scope of the present invention.

[0066] In addition, in a third preferred embodiment, Figure 5 As shown, the hollow tube 4 of the filter element of the present invention further includes an elastic sheet 43 , one end of the elastic sheet 43 is fixed in the hollow tube 4 , and the other end of the elastic sheet 43 covers the through hole 41 .

[0067] For example, Figure 5 As shown, the elastic sheet 43 of the present invention is a stainless steel sheet with elasticity. The lower end of the elastic sheet 43 is fixed on the inner wall of the hollow tube 4, and the upper end of the elastic sheet 43 covers the through hole 41 on the side wall of the hollow tube 4.

[0068] When the filter element produces water normally, the clean water produced by the reverse osmosis membrane 2 passes through the first interval flow channel and the through hole 41 into the hollow tube 4. Due to the impact of water pressure, the elastic sheet 43 is flushed open by the water flow to ensure that the clean water in the first interval flow channel continuously passes through the through hole 41 and flows into the chamber of the hollow tube 4.

[0069] When the elastic sheet 43 is not impacted by water flow, the elastic sheet 43 returns to the position of the through hole 41 by its own elastic force and covers the through hole 41. In this way, when the filter element stops producing water and continues for a period of time, the soluble solids in the concentrated water in the reverse osmosis membrane 2 can only diffuse into the first gap flow channel 14 through the water permeable holes 31 of the water permeable pipe 3 under the action of concentration difference, avoiding the soluble solids in the first gap flow channel 14 from diffusing into the hollow tube 4 through the through hole 41, and avoiding the increase of the TDS value of the purified water in the hollow tube 4.

[0070] It should be noted that, according to actual applications, those skilled in the art may select a plastic elastic sheet 43 for the elastic sheet 43, or may select an elastic sheet 43 made of silicone. Such flexible adjustment and change of the specific material of the elastic sheet 43 does not deviate from the principle and scope of the present invention, and should be limited within the protection scope of the present invention. Of course, the elastic sheet 43 is preferably a stainless steel sheet, which has a longer elasticity retention time.

[0071] Finally, the present invention also provides a water purification device, which includes the above-mentioned filter element.

[0072] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A filter element, characterized in that: include: A housing (1) is provided with a raw water inlet (12), a clean water inlet (11) and a waste water inlet (13); a water-permeable pipe (3), which is located in the shell (1) and forms a receiving chamber with the inner wall of the shell (1); a reverse osmosis membrane (2), which is located in the containing chamber and is wound on the water permeable pipe (3), the water inlet end of the reverse osmosis membrane (2) being connected to the raw water inlet (12), and the concentrated water end of the reverse osmosis membrane (2) being connected to the waste water inlet (13); and A hollow tube (4) located inside the water-permeable tube (3); A first gap flow channel (14) is formed between the outer wall of the hollow tube (4) and the inner wall of the water-permeable tube (3); one end of the hollow tube (4) is connected to the water purification port (11); and the other end of the hollow tube (4) is provided with a through hole (41) connected to the first gap flow channel (14).

2. The filter element according to claim 1, characterized in that: The filter element further comprises a flow channel support strip (42) located in the first gap flow channel (14), and the flow channel support strip (42) is clamped and fixed by the outer wall of the hollow tube (4) and the inner wall of the water-permeable tube (3).

3. The filter element according to claim 2, characterized in that: The flow channel support strip (42) is fixed on the hollow tube (4), and the flow channel support strip (42) is distributed in a threaded shape along the axial direction of the hollow tube (4).

4. The filter element according to claim 2, characterized in that: The flow channel support strip (42) is fixed on the hollow tube (4), the flow channel support strip (42) is in multiple number, the multiple flow channel support strips (42) are evenly spaced and distributed along the circumference of the hollow tube (4), and the multiple flow channel support strips (42) are all arranged parallel to the axis of the hollow tube (4).

5. The filter element according to claim 1, characterized in that: The hollow tube (4) further comprises an elastic sheet (43), one end of the elastic sheet (43) is fixed inside the hollow tube (4), and the other end of the elastic sheet (43) covers the through hole (41).

6. The filter element according to claim 1, characterized in that: The water-permeable pipe (3) has a water-permeable hole (31), and the through hole (41) is arranged to avoid the water-permeable hole (31).

7. The filter element according to claim 1, characterized in that: The distance between the outer wall of the hollow tube (4) and the inner wall of the water-permeable tube (3) is set to 1 mm to 8 mm.

8. The filter element according to claim 1, characterized in that: A second gap flow channel (15) is formed between the outer wall of the reverse osmosis membrane (2) and the inner wall of the shell (1), and the second gap flow channel (15) is connected to the raw water inlet (12).

9. The filter element according to claim 1, characterized in that: The filter element further comprises a rear module (5), wherein the rear module (5) is fixedly connected to the other end of the hollow tube (4), the water inlet end of the rear module (5) is in communication with the first gap flow channel (14), and the water outlet end of the rear module (5) is in communication with the through hole (41).

10. A water purification device, characterized in that: A filter element comprising the filter element according to any one of claims 1 to 9.

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