Reverse osmosis filter element, filter element assembly and water purification equipment

Abstract

The utility model relates to a reverse osmosis filter element, a filter element assembly and water purification equipment, and the reverse osmosis filter element comprises a shell which is provided with a water inlet, a waste water port and a purified water port; the central pipe is arranged in the shell, the central pipe is provided with a hollow water purification cavity, the side wall of the central pipe is provided with a water passing hole, and the first end of the central pipe is in fluid communication with the water purification opening; the reverse osmosis membrane is located in the shell and arranged around the periphery of the central pipe, and a wastewater cavity communicated with a wastewater opening fluid is formed between the outer side face of the reverse osmosis membrane and the inner wall of the shell; the water purifier is characterized by further comprising a one-way valve which is arranged between the central pipe and the water inlet end of the reverse osmosis membrane, and the one-way valve is opened towards the water inlet end of the reverse osmosis membrane in a one-way mode so that purified water in the central pipe can flow into the water inlet end of the reverse osmosis membrane. The reverse osmosis water purifier has the advantages that the water inlet end of the reverse osmosis membrane can be flushed, TDS (total dissolved solids) in raw water is effectively prevented from diffusing into purified water, and the problem that the purified water concentration of a first cup of purified water is relatively high is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of water purification, in particular to a reverse osmosis filter element, a filter element component and water purification equipment. Background Art

[0002] For example, the Chinese invention patent with application number CN202011629569.6 (application publication number CN112933973A) discloses a reverse osmosis filter element, a composite filter element and a water purifier with backwashing function. When the water purifier starts working, raw water enters the primary filter chamber of the composite filter element, is filtered by the primary filter element, and then forms clean water that enters the secondary filter chamber. The clean water is filtered by the reverse osmosis filter element to separate out pure water and concentrated water. A pure water outlet chamber is provided in the reverse osmosis filter element. The pure water fills the pure water outlet chamber and enters the pressure water storage chamber of the recoil pressure device to push the recoil part. When the water purifier stops working, the water inlet stops. The recoil part is reset under the action of elastic force to push out the pure water in the pressure water storage chamber to form a backwash water flow. The backwash water flow refluxes into the concentrated water separation water path of the reverse osmosis filter element for flushing, and the concentrated water is completely discharged to prevent the concentrated water from remaining in the reverse osmosis filter element. Although the above-mentioned reverse osmosis filter element has a backwashing function, the above-mentioned reverse osmosis filter element has the following limitations: First, the pure water in the above-mentioned pressure water storage chamber can only be used to flush the concentrated water precipitation water path of the reverse osmosis filter element, and cannot be used to flush the water inlet end of the reverse osmosis filter element. Therefore, the TDS in the raw water will diffuse into the purified water, which will cause the TDS concentration of the first cup of purified water to be relatively high; second, the above-mentioned pressure water storage chamber is a closed chamber. Due to the presence of gas in the closed chamber, the pressure of the pure water needs to be large enough to push the recoil component, so the above-mentioned flushing method is not suitable for the situation where the pure water flow rate is small or the water pressure is low. Therefore, further improvements to the existing technology are needed. Utility Model Content

[0003] The first technical problem to be solved by the utility model is to provide a reverse osmosis filter element capable of flushing its water inlet end to solve the problem of high TDS concentration in the first cup of purified water, with respect to the above-mentioned prior art.

[0004] The second technical problem to be solved by the utility model is to provide a reverse osmosis filter element which can be flushed even when the pure water flow rate is small or the water pressure is low, in view of the above-mentioned prior art.

[0005] The third technical problem to be solved by the utility model is to provide a filter element assembly using the above reverse osmosis filter element.

[0006] The fourth technical problem to be solved by the utility model is to provide a water purification device using the above filter element assembly.

[0007] The technical solution adopted by the utility model to solve the above-mentioned first technical problem is: a reverse osmosis filter element, comprising:

[0008] The shell has a water inlet, a wastewater outlet and a clean water outlet;

[0009] A central tube is disposed in the shell, the central tube has a hollow water purification cavity and a side wall has a water through hole, and a first end of the central tube is in fluid communication with the water purification port;

[0010] A reverse osmosis membrane is located in the shell and arranged around the outer circumference of the central tube, the reverse osmosis membrane is close to the water inlet to form a water inlet end, the outer side of the reverse osmosis membrane forms a wastewater end, the inner side of the reverse osmosis membrane forms a clean water end, and a wastewater cavity connected to the wastewater outlet fluid is formed between the outer side of the reverse osmosis membrane and the inner wall of the shell;

[0011] The invention is characterized in that:

[0012] The one-way valve is arranged between the central tube and the water inlet end of the reverse osmosis membrane, and the one-way valve opens unidirectionally toward the water inlet end of the reverse osmosis membrane, so that the clean water in the central tube can flow into the water inlet end of the reverse osmosis membrane.

[0013] Preferably, the one-way valve comprises:

[0014] A valve seat, which is hollow inside and has a first through hole in fluid communication with the central tube;

[0015] A valve stem is constrained in the valve seat, and one end of the valve stem is arranged at the water inlet end of the reverse osmosis membrane, and the other end of the valve stem corresponds to the first through hole of the valve seat;

[0016] The first elastic member is arranged in the valve seat and acts on the valve stem, so that the valve stem always has a tendency to move toward the first through hole to close the first through hole.

[0017] To facilitate the installation of the one-way valve, a cavity with a hollow interior and an open end is provided on the end face of the center tube near its first end. The cavity is used to accommodate the one-way valve, and a second through hole is provided on the cavity that penetrates the wall thickness. The second through hole is arranged opposite to the first through hole.

[0018] In order to solve the second technical problem, the shell is further provided with an air inlet connected to the second end of the central tube, and a telescopic member is further provided in the central tube, wherein the first end of the telescopic member is constrained to the second end of the central tube, and the second end of the telescopic member is freely extended in the center of the central tube, and the telescopic member is configured in the following two states:

[0019] When water is flowing into the water inlet, the telescopic member in a natural state is deformed under the water pressure of the clean water in the central tube;

[0020] When water stops flowing into the water inlet, the deformed telescopic member is reset, and then the second end of the telescopic member moves toward the first end of the central tube, so that the telescopic member returns to a natural state.

[0021] Since the air inlet is provided, the telescopic member in the central tube can be deformed by only overcoming the elastic force of the telescopic member itself. Therefore, when the pure water flow is small or the water pressure is low, the telescopic member can also be compressed.

[0022] In order to improve the flushing effect, the water hole on the central tube is always exposed to the telescopic part.

[0023] Preferably, the water hole on the central tube is arranged adjacent to the first end tube wall of the central tube.

[0024] The telescopic member preferably has a first mode as follows: the telescopic member comprises a second elastic member constrained in a central tube and a push plate constrained at a free end of the second elastic member, the push plate serving as a second end of the telescopic member, and the push plate is sealingly connected to the central tube.

[0025] The second preferred embodiment of the telescopic member is that the telescopic member is an air bag capable of undergoing compression deformation.

[0026] The technical solution adopted by the utility model to solve the third technical problem is: a filter element component, characterized in that: the reverse osmosis filter element as mentioned above is applied.

[0027] The technical solution adopted by the utility model to solve the fourth technical problem is: a water purification device, characterized in that: the filter element assembly as mentioned above is applied.

[0028] Compared with the prior art, the advantages of the utility model are: by setting a one-way valve, and the one-way valve is opened unidirectionally toward the water inlet end of the reverse osmosis membrane, the clean water in the central tube can flow into the water inlet end of the reverse osmosis membrane to flush the water inlet end of the reverse osmosis membrane, effectively preventing the TDS in the raw water from diffusing into the clean water, and solving the problem of relatively high clean water concentration in the first cup of clean water. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a cross-sectional view of the reverse osmosis filter element in the first embodiment of the utility model;

[0030] Figure 2 This is a waterway diagram of the water purification device in the first embodiment of the utility model;

[0031] Figure 3 It is a cross-sectional view of the reverse osmosis filter element in the second embodiment of the present utility model. DETAILED DESCRIPTION

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0033] Embodiment 1:

[0034] like Figure 1 As shown, the reverse osmosis filter element in this embodiment includes a housing 1 , a central tube 2 , a reverse osmosis membrane 3 , a one-way valve 4 and a telescopic member 5 .

[0035] The shell 1 has a water inlet 1a, a wastewater outlet 1b, a clean water outlet 1c and an air inlet 1d. The shell 1 in this embodiment is tubular. The water inlet 1a, the wastewater outlet 1b and the clean water outlet 1c are opened at the same end of the shell 1, and the air inlet 1d is opened at the other end of the shell 1.

[0036] The central tube 2 and the reverse osmosis membrane 3 are both arranged in the shell 1, the central tube 2 has a hollow clean water cavity 21 and a side wall has a water hole 22, the first end 2a of the central tube 2 is in fluid communication with the clean water port 1c; the reverse osmosis membrane 3 is arranged around the outer periphery of the central tube 2, the reverse osmosis membrane 3 forms a water inlet end 31 at one end close to the water inlet 1a, the outer side of the reverse osmosis membrane 3 forms a waste water end 32, the inner side of the reverse osmosis membrane 3 forms a clean water end 33, and a waste water cavity 30 is formed between the outer side of the reverse osmosis membrane 3 and the inner wall of the shell 1, which is in fluid communication with the waste water port 1b; Figure 1 As shown, the reverse osmosis membrane 3 in this embodiment is a rolled membrane and the inner side surface of the reverse osmosis membrane 3 is arranged in contact with the outer peripheral wall of the central tube 2 .

[0037] The one-way valve 4 is disposed between the central tube 2 and the water inlet end 31 of the reverse osmosis membrane 3, and the one-way valve 4 opens unidirectionally toward the water inlet end 31 of the reverse osmosis membrane 3, so that the purified water in the central tube 2 can flow into the water inlet end 31 of the reverse osmosis membrane 3. Figure 1 As shown, the one-way valve 4 in this embodiment includes a valve seat 41, a valve stem 42 and a first elastic member 43. The valve seat 41 is hollow inside and has a first through hole 411 on the valve seat 41 that is in fluid communication with the central tube 2. The valve stem 42 is constrained in the valve seat 41, and one end of the valve stem 42 is disposed at the water inlet end 31 of the reverse osmosis membrane 3, and the other end of the valve stem 42 corresponds to the first through hole 411 of the valve seat 41. The first elastic member 43 is disposed in the valve seat 41 and acts on the valve stem 42, so that the valve stem 42 always has a tendency to move toward the first through hole 411 and close the first through hole 411. The first elastic member 43 is a spring.

[0038] In this embodiment, a cavity 23 with a hollow interior and an open end is provided on the end surface of the center tube 2 near the first end 2a thereof, and the cavity 23 is used to accommodate the one-way valve 4 therein, and a second through hole 231 penetrating through the wall thickness of the cavity 23 is provided, and the second through hole 231 is arranged opposite to the first through hole 411. This makes it easy to install the one-way valve 4.

[0039] The above-mentioned air inlet 1d is connected to the second end 2b of the central tube 2, and the above-mentioned telescopic member 5 is arranged in the central tube 2. The first end of the telescopic member 5 is constrained at the second end 2b of the central tube 2, and the second end of the telescopic member 5 is freely extended in the center of the central tube 2. The telescopic member 5 is configured into the following two states: when water is flowing into the water inlet 1a, the telescopic member 5 in a natural state is deformed under the water pressure of the clean water in the central tube 2; when water stops flowing into the water inlet 1a, the deformed telescopic member 5 is reset, and then the second end of the telescopic member 5 moves toward the first end 2a of the central tube 2, thereby restoring the telescopic member 5 to its natural state.

[0040] In addition, the water hole 22 on the central tube 2 is always exposed to the telescopic member 5. In this embodiment, the water hole 22 on the central tube 2 is arranged adjacent to the tube wall of the first end 2a of the central tube 2.

[0041] like Figure 1 As shown, the telescopic member 5 in this embodiment includes a second elastic member 51 constrained in the central tube 2 and a push plate 52 constrained at the free end of the second elastic member 51, the push plate 52 serving as the second end of the telescopic member 5, and the push plate 52 is sealed and connected to the central tube 2. In this embodiment, the second elastic member 51 is a spring arranged along the axial direction of the central tube 2, and the push plate 52 is arranged along the radial direction of the central tube 2. By arranging the telescopic member 5 in the central tube 2, there is no need to separately arrange an installation space for the telescopic member 5, thus saving installation space. In addition, the telescopic member 5 in this embodiment is connected to the outside air through the air inlet 1d, so that it is only necessary to overcome the elastic force of the second elastic member 51.

[0042] This embodiment also relates to a filter element assembly using the above-mentioned reverse osmosis filter element and a water purification device using the filter element assembly.

[0043] like Figure 2 As shown, the water purification equipment in this embodiment also includes a pipeline 6, a pre-filter element 71 and a post-filter element 72. The pre-filter element 71, the reverse osmosis filter element and the post-filter element 72 are arranged on the pipeline 6 in sequence, and the pipeline 6 is also provided with an inlet valve 81 and a booster pump 82 located between the pre-filter element 71 and the reverse osmosis filter element. The wastewater outlet 1b of the reverse osmosis filter element is also connected to a wastewater pipe 83, and a wastewater valve 84 is provided on the wastewater pipe 83.

[0044] The working process of the reverse osmosis filter element in the water purification equipment of this embodiment is as follows:

[0045] 1. Water production status:

[0046] Open the water inlet valve 81 and the booster pump 82. When the pressurized tap water enters the interior of the housing 1 through the water inlet 1a, it first passes through the reverse osmosis membrane 3. At this time, the pure water of the reverse osmosis membrane 3 enters the clean water cavity 21 of the central tube 2 through the water inlet end 33, and the waste water of the reverse osmosis membrane 3 flows into the waste water port 1b. At this time, because the clean water has pressure, the pressure will push the push plate 52 toward the second end 2b of the central tube 2, and the second elastic member 51 will be compressed.

[0047] 2. Flushing status:

[0048] Close the water inlet 1a and open the waste water valve 84. On the one hand, since the water inlet pressure of the reverse osmosis membrane 3 is close to 0 at this time, the first elastic member 43 can be compressed under the clean water pressure in the central tube 2, thereby making the one-way valve 4 conductive (the valve stem 42 is separated from the first through hole 411), so that the clean water in the central tube 2 can flow out toward the water inlet end of the reverse osmosis membrane 3 through the one-way valve 4, so as to flush the water inlet end 31 of the reverse osmosis membrane 3; on the other hand, when the water inlet pressure of the reverse osmosis membrane 3 is close to 0, the second elastic member 51 can be reset and push the push plate 52 to move toward the first end 2a of the central tube 2, and the clean water in the central tube 2 can flow out from the water hole 22 under the push of the push plate 52, thereby flushing the waste water end 32 of the reverse osmosis membrane. Therefore, the flushing force of the waste water end 32 of the above-mentioned reverse osmosis membrane is increased by the action of the second elastic member 51, so that the flushing is cleaner.

[0049] Embodiment 2:

[0050] like Figure 3 As shown, different from the first embodiment, the telescopic member 5 in this embodiment is an air bag that can undergo compression deformation.

[0051] The "fluid communication" referred to in the present invention refers to the spatial position relationship between two parts or parts (hereinafter collectively referred to as the first part and the second part), that is, the fluid (gas, liquid or a mixture of the two) can flow from the first part along the flow path or / and be transported to the second part. The first part and the second part can be directly connected, or the first part and the second part can be indirectly connected through at least one third party. The third party can be a fluid channel such as a pipe, channel, duct, guide member, hole, groove, etc., or it can be a chamber allowing fluid to flow through, or a combination of the above.

Claims

1. A reverse osmosis filter element, comprising: The housing (1) has a water inlet (1a), a waste water outlet (1b) and a clean water outlet (1c); A central tube (2) is arranged in the shell (1), the central tube (2) having a hollow water purification chamber (21) and a water passage hole (22) on the side wall, and the first end (2a) of the central tube (2) is in fluid communication with the water purification port (1c); A reverse osmosis membrane (3) is located in the shell (1) and arranged around the outer periphery of the central tube (2); the reverse osmosis membrane (3) has an end close to the water inlet (1a) forming a water inlet end (31); the outer side surface of the reverse osmosis membrane (3) forms a wastewater end (32); the inner side surface of the reverse osmosis membrane (3) forms a clean water end (33); and a wastewater cavity (30) in fluid communication with the wastewater outlet (1b) is formed between the outer side surface of the reverse osmosis membrane (3) and the inner wall of the shell (1); The invention is characterized in that it also includes: A one-way valve (4) is provided between the central tube (2) and the water inlet end (31) of the reverse osmosis membrane (3), and the one-way valve (4) opens in one direction toward the water inlet end (31) of the reverse osmosis membrane (3), so that the clean water in the central tube (2) can flow into the water inlet end (31) of the reverse osmosis membrane (3).

2. The reverse osmosis filter element according to claim 1, characterized in that: The one-way valve (4) comprises: A valve seat (41) having a hollow interior and having a first through hole (411) in fluid communication with the central tube (2); A valve stem (42) is constrained in the valve seat (41), and one end of the valve stem (42) is arranged at the water inlet end (31) of the reverse osmosis membrane (3), and the other end of the valve stem (42) corresponds to the first through hole (411) of the valve seat (41); A first elastic member (43) is disposed in the valve seat (41) and acts on the valve stem (42) so that the valve stem (42) always has a tendency to move toward the first through hole (411) to close the first through hole (411).

3. The reverse osmosis filter element according to claim 2, characterized in that: The central tube (2) is provided with a cavity (23) on its end surface close to the first end (2a) thereof, which is hollow inside and open at one end. The cavity (23) is used to accommodate the one-way valve (4). Furthermore, the cavity (23) is provided with a second through hole (231) penetrating through the wall thickness thereof, and the second through hole (231) is arranged opposite to the first through hole (411).

4. The reverse osmosis filter element according to any one of claims 1 to 3, characterized in that: The shell (1) is also provided with an air inlet (1d) connected to the second end (2b) of the central tube (2); a telescopic member (5) is also provided in the central tube (2); a first end of the telescopic member (5) is constrained by the second end (2b) of the central tube (2); a second end of the telescopic member (5) is freely extended in the center of the central tube (2); and the telescopic member (5) is configured in the following two states: When water is flowing into the water inlet (1a), the telescopic member (5) in a natural state is deformed under the water pressure of the clean water in the central tube (2); When water stops flowing into the water inlet (1a), the deformed telescopic member (5) is reset, and the second end of the telescopic member (5) moves toward the first end (2a) of the central tube (2), thereby restoring the telescopic member (5) to a natural state.

5. The reverse osmosis filter element according to claim 4, characterized in that: The water passage hole (22) on the central tube (2) is always exposed to the telescopic member (5).

6. The reverse osmosis filter element according to claim 5, characterized in that: The water passage hole (22) on the central tube (2) is arranged adjacent to the tube wall of the first end (2a) of the central tube (2).

7. The reverse osmosis filter element according to claim 5, characterized in that: The telescopic member (5) comprises a second elastic member (51) constrained in the central tube (2) and a push plate (52) constrained at the free end of the second elastic member (51); the push plate (52) serves as the second end of the telescopic member (5); and the push plate (52) is sealed and connected to the central tube (2).

8. The reverse osmosis filter element according to claim 5, characterized in that: The telescopic member (5) is an air bag capable of undergoing compression deformation.

9. A filter element assembly, characterized in that: The reverse osmosis filter element is applied as described in any one of claims 1 to 8.

10. A water purification device, characterized in that: The filter element assembly as claimed in claim 9 is used.

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