Filter element and water purification system

Abstract

The utility model discloses a filter element and a water purification system, and relates to the technical field of water purification, the filter element comprises a shell, a central water inlet pipe, a central water outlet pipe and a filter membrane body, an accommodating cavity is formed in the shell; a raw water inlet, a pure water outlet and a wastewater outlet which are communicated with the accommodating cavity are formed in the top of the shell; the central water inlet pipe is positioned in the accommodating cavity and central water inlet holes are formed in the peripheral side of the central water inlet pipe; the central water outlet pipe is positioned in the inner cavity of the central water inlet pipe and the upper end is communicated with the wastewater outlet; the filtering membrane body is wound on the central water inlet pipe and is communicated with the central water inlet hole; the upper end and the lower end of the filtering membrane body are respectively communicated with the raw water inlet and the lower end of the central water outlet pipe, a water storage space is formed between the periphery of the filtering membrane body and the inner wall of the shell, and the bottom and the top of the water storage space are respectively communicated with the lower end of the central water inlet pipe and the pure water outlet. According to the scheme, the proportion of pure water in the water body in the filter element is increased by improving the waterway structure of the filter element, and the TDS value of the first cup of water after the filter element is shut down and restarted can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of water purification, and particularly relates to a filter element and a water purification system. Background Art

[0002] The core component of a water purifier is the filter element. The filter element filters raw water through corresponding membrane elements to remove impurities and pollutants such as bacteria, calcium and magnesium ions, and heavy metals, ensuring the quality of the outlet water.

[0003] In the existing filter elements, especially those using reverse osmosis membranes, the proportion of raw water and wastewater obtained after filtration in the filter element system is much larger than that of pure water obtained after filtration. When the water purifier stops running, the inlet solenoid valve closes, forming a closed space inside the filter element. At this time, the remaining raw water, wastewater, and pure water in each part of the filter element are mixed and diluted; and because the proportion of raw water and wastewater is much larger than that of pure water, it will lead to a very high TDS value (Total Dissolved Solids) at the inlet end of the entire filter element after shutdown; when the water purifier is started again, the inlet solenoid valve opens, and under the action of pressure, it will first filter this part of the mixed water body with a high TDS value retained in the filter element, so naturally the TDS value of the pure water obtained after filtration for a period of time after restarting is relatively high, thus having an adverse impact on the normal use of the water purifier. Summary of the Utility Model

[0004] The main purpose of the utility model is to propose a filter element, aiming to solve the problem that the TDS value of the first glass of water obtained after filtration is relatively high when the existing filter element is restarted after shutdown.

[0005] To achieve the above object, the filter element proposed by the utility model includes:

[0006] A housing with an accommodation cavity provided therein; a raw water inlet, a pure water outlet, and a wastewater outlet communicating with the accommodation cavity are provided at the top of the housing;

[0007] A central water inlet pipe is arranged in the accommodation cavity; central water inlet holes are provided on the peripheral side of the central water inlet pipe;

[0008] A central water outlet pipe is arranged in the inner cavity of the central water inlet pipe; the upper end of the central water outlet pipe is communicated with the wastewater outlet;

[0009] A filter membrane body is wound around the central water inlet pipe and communicates with the central water inlet holes; the upper end of the filter membrane body is communicated with the raw water inlet, the lower end of the filter membrane body is communicated with the lower end of the central water outlet pipe, a water storage space is formed between the outer peripheral wall of the filter membrane body and the inner wall of the housing, the bottom of the water storage space is communicated with the lower end of the central water inlet pipe, and the top of the water storage space is communicated with the pure water outlet.

[0010] In one embodiment, the filter element further includes a first shunt cover; the first shunt cover is covered on the upper end of the filter membrane body, a first annular channel is formed on the lower end surface of the first shunt cover, and the first annular channel is communicated with the upper end surface of the filter membrane body; an inlet channel is arranged in the first shunt cover, the upper end of the inlet channel is communicated with the raw water inlet, and the lower end of the inlet channel is communicated with the first annular channel.

[0011] In one embodiment, a receiving through hole is formed in the center of the first shunt cover, the filter element further includes a first water path conversion member, the first water path conversion member is arranged in the receiving through hole, the first water path conversion member has a boss portion extending downward, and the boss portion is inserted and matched with the upper end of the central water inlet pipe; a first water outlet channel is arranged in the first water path conversion member, the upper end of the first water outlet channel is communicated with the waste water outlet, and the lower end of the first water outlet channel penetrates through the boss portion and is communicated with the upper end of the central water outlet pipe.

[0012] In one embodiment, the filter element further includes a first sealing sleeve, the first sealing sleeve is hermetically sleeved on the upper end of the central water outlet pipe, the outer wall of the first sealing sleeve is hermetically matched with the inner wall of the upper end of the central water inlet pipe, and the first sealing sleeve is located below the boss portion.

[0013] In one embodiment, a second water outlet channel is arranged in the first water path conversion member, and a third water outlet channel is arranged in the first shunt cover; one end of the third water outlet channel is communicated with the top of the water storage space, and the other end of the third water outlet channel is communicated with the receiving through hole; one end of the second water outlet channel is communicated with the receiving through hole, and the other end of the second water outlet channel is communicated with the pure water outlet.

[0014] In one embodiment, the upper end of the first water outlet channel forms a first receiving cavity on the first water path conversion member; a first flange extending downward is arranged at the top of the housing, the first flange is located in the first receiving cavity, and the first flange encloses to form a second receiving cavity, and the second receiving cavity is respectively communicated with the other end of the second water outlet channel and the pure water outlet; a first annular flow-through space is formed between the outer side wall of the first flange and the cavity wall of the first receiving cavity, and the first annular flow-through space is communicated with the waste water outlet.

[0015] In one embodiment, the upper end of the water inlet channel forms a third accommodation cavity on the first shunt cover; the top of the housing is further provided with a second flange extending downward, the inner side wall of the second flange is sealingly fitted with the peripheral side of the first water path conversion member, and a second annular flow passage space is formed between the outer side wall of the second flange and the cavity wall of the third accommodation cavity, and the lower end of the second annular flow passage space is communicated with the first annular channel.

[0016] In one embodiment, the filter element further includes a second water path conversion member, the second water path conversion member is sealingly sleeved on the lower end of the central water outlet pipe, and the outer wall of the second water path conversion member is sealingly fitted with the inner wall of the lower end of the central water inlet pipe; a first flow passage and a second flow passage are provided in the second water path conversion member, the upper end of the first flow passage is communicated with the inner cavity of the central water inlet pipe, the lower end of the first flow passage is communicated with the water storage space, the upper end of the second flow passage is communicated with the inner cavity of the central water outlet pipe, and the lower end of the second flow passage is communicated with the lower end of the filter membrane body.

[0017] In one embodiment, the filter element further includes a second shunt cover, the second shunt cover covers the lower end of the filter membrane body; a fourth accommodation cavity is provided on the upper end surface of the second shunt cover, a flow through hole is provided in the fourth accommodation cavity, the lower end of the central water inlet pipe is sealingly fitted in the flow through hole, and the lower end of the first flow passage is communicated with the water storage space through the flow through hole; a third annular flow passage space is enclosed between the cavity wall of the fourth accommodation cavity, the lower end surface of the filter membrane body, and the outer wall of the central water inlet pipe; a third flow passage is provided at the lower end of the central water inlet pipe, one end of the third flow passage is communicated with the third annular flow passage space, and the other end of the third flow passage is communicated with the lower end of the second flow passage.

[0018] The present utility model also proposes a water purification system, including the filter element as described above.

[0019] In the technical solution of the present utility model, the pure water obtained after being filtered by the filter membrane body is not directly discharged from the upper end of the central pipe, but flows from the lower end of the central water inlet pipe through the water storage space and then is discharged from the pure water outlet; that is to say, in addition to the central water inlet pipe, the path that the pure water needs to flow through also additionally increases the water storage space. In this way, the proportion of pure water in the filter element can be increased during the working process of the filter element, thereby reducing the TDS value (Total Dissolved Solids) in the filter element after shutdown, and further reducing the TDS value of the first glass of water filtered by the filter element after restarting after shutdown. In addition, the water flow structure corresponding to the filter element of the present utility model has a more uniform water flow distribution compared with the water flow structure of the existing filter element, which can better avoid the problems of water flow stagnation or slow flow in local positions. And since the bottom of the filter element is a water storage space for accommodating pure water, it can avoid the accumulation and residue of raw water and wastewater at the bottom of the filter element, thus preventing the formation of dead zones. Brief Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0021] Figure 1 Schematic three-dimensional structure diagram of an embodiment of the filter element provided by the present utility model;

[0022] Figure 2 Schematic top view structure diagram of an embodiment of the filter element provided by the present utility model;

[0023] Figure 3 For Figure 2 A-A cross-sectional structure diagram in

[0024] Figure 4 For Figure 2 B-B cross-sectional structure diagram in

[0025] Figure 5 Schematic diagram of the water flow path of an embodiment of the filter element provided by the present utility model;

[0026] Figure 6 For Figure 3 Enlarged schematic diagram at C in

[0027] Figure 7 For Figure 4 Enlarged schematic diagram at D in

[0028] Figure 8 For Figure 4Enlarged schematic diagram at position E.

[0029] Explanation of the reference numerals in the attached drawings:

[0030] 1. Housing; 101. Raw water inlet; 102. Pure water outlet; 103. Waste water outlet; 104. Water storage space; 105. First flange; 106. Second flange; 1051. Second accommodation cavity;

[0031] 2. Central inlet pipe; 201. Central inlet hole; 202. Third flow-through channel;

[0032] 3. Central outlet pipe;

[0033] 4. Filter membrane body;

[0034] 5. First flow diversion cover; 501. First annular channel; 502. Inlet channel; 503. Third outlet channel; 5021. Second annular flow-through space;

[0035] 6. First water path conversion part; 601. Boss part; 602. First outlet channel; 603. Second outlet channel; 6021. First annular flow-through space;

[0036] 7. First sealing sleeve;

[0037] 8. Second sealing sleeve;

[0038] 9. Second water path conversion part; 901. First flow-through channel; 902. Second flow-through channel;

[0039] 10. Second flow diversion cover; 1001. Third annular flow-through space; 1002. Flow-through hole;

[0040] 11. Fixed bushing.

[0041] The realization, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0042] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0043] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0044] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0045] In the prior art, for a filter element, especially a filter element using a reverse osmosis membrane, the proportion of raw water and wastewater obtained after filtration in the filter element system is much larger than that of pure water obtained after filtration. When the water purifier stops running, the inlet solenoid valve closes, and a closed space is formed inside the filter element. At this time, the raw water, wastewater, and pure water remaining in each part of the filter element are all mixed and diluted. Since the proportion of raw water and wastewater is much larger than that of pure water, the TDS value (Total Dissolved Solids) at the water inlet end of the entire filter element after shutdown is extremely high. When the water purifier is restarted later, the inlet solenoid valve opens, and under the action of pressure, this part of the mixed water body with a high TDS value remaining in the filter element will be filtered first. Naturally, this leads to a relatively high TDS value of the pure water filtered in a period of time after restarting, thus having an adverse impact on the normal use of the water purifier.

[0046] To solve the above problems, the present utility model provides a filter element, which improves the proportion of pure water in the water body inside the filter element by improving the water path structure inside the filter element, thereby reducing the TDS value of the first glass of water filtered after the filter element is restarted after shutdown.

[0047] Please refer to Figures 1 to 5 , the filter element provided by the present utility model includes:

[0048] A housing 1, which is internally provided with a receiving cavity; at the top of the housing 1, there are provided a raw water inlet 101, a pure water outlet 102, and a wastewater outlet 103 that communicate with the receiving cavity;

[0049] A central water inlet pipe 2 is arranged in the accommodating cavity; central water inlet holes 201 are formed on the circumferential side of the central water inlet pipe 2;

[0050] A central water outlet pipe 3 is arranged in the inner cavity of the central water inlet pipe 2; the upper end of the central water outlet pipe 3 is communicated with the waste water outlet 103;

[0051] A filter membrane body 4 is wound around the central water inlet pipe 2 and communicated with the central water inlet holes 201; the upper end of the filter membrane body 4 is communicated with the raw water inlet 101, the lower end of the filter membrane body 4 is communicated with the lower end of the central water outlet pipe 3, a water storage space 104 is formed between the outer peripheral wall of the filter membrane body 4 and the inner wall of the housing 1, the bottom of the water storage space 104 is communicated with the lower end of the central water inlet pipe 2, and the top of the water storage space 104 is communicated with the pure water outlet 102.

[0052] In this embodiment, the filter membrane body 4 may specifically adopt a RO membrane (Reverse Osmosis membrane), which is wound around the central water inlet pipe 2 in the same manner as the existing reverse osmosis membrane filter element. The central water inlet holes 201 may be provided in plurality, and the plurality of central water inlet holes 201 may be arranged at intervals along the circumferential direction of the central water inlet pipe 2 and arranged in an array along the axial direction of the central water inlet pipe 2, and specifically may refer to the central pipe of the existing reverse osmosis membrane filter element. The outer diameter of the central water outlet pipe 3 is smaller than the inner diameter of the central water inlet pipe 2, and the central water outlet pipe 3 may be fixed at the central position of the inner cavity of the central water inlet pipe 2 by means of corresponding pipe joints, conversion parts, etc., so as to ensure that there is a space for water flow to pass between the outer wall of the central water outlet pipe 3 and the inner wall of the central water inlet pipe 2. Further, a flow splitting structure may be provided at the lower ends of the central water inlet pipe 2 and the central water outlet pipe 3 to form two flow channels, one of the flow channels communicates the lower end of the central water inlet pipe 2 and the water storage space 104, and the other flow channel communicates the lower end of the central water outlet pipe 3 and the lower end of the filter membrane body 4, and the two flow channels do not interfere with each other; wherein, the flow splitting structure may be directly provided on the pipe joints, conversion parts for realizing the mutual fixation between the central water inlet pipe 2 and the central water outlet pipe 3, or may be provided on other structural parts in the housing 1 that cooperate with the pipe joints, conversion parts, and no limitation is made here.

[0053] Based on the above settings, during the filtration process using this filter element, such as Figures 3 to 5As shown, the external raw water enters from the raw water inlet 101, and after being filtered by the filter membrane body 4, wastewater and pure water are obtained. Among them, the wastewater reaches the central outlet pipe 3 after flowing to the lower end of the filter membrane body 4, and then flows upward through the central outlet pipe 3 to the upper wastewater outlet 103, and finally is discharged outward from the wastewater outlet 103. The pure water flows radially inward along the filter membrane body 4. After the pure water enters the inner cavity of the central inlet pipe 2 through the central inlet hole 201 (specifically, the flow-through space formed between the inner wall of the central inlet pipe 2 and the outer wall of the central outlet pipe 3), it will flow into the water storage space 104 from the lower end of the central inlet pipe 2, and then flow upward from the water storage space 104 to the upper pure water outlet 102, and finally is discharged outward from the pure water outlet 102.

[0054] Compared with the filter element in the prior art, in this embodiment, the pure water obtained after being filtered by the filter membrane body 4 is not directly discharged from the upper end of the central pipe, but flows from the lower end of the central inlet pipe 2 through the water storage space 104 and then is discharged from the pure water outlet 102. That is to say, in addition to the central inlet pipe 2, the path that the pure water needs to flow through also additionally increases the water storage space 104. In this way, the proportion of pure water in the filter element during the operation of the filter element can be increased, thereby reducing the TDS value (Total Dissolved Solids) in the filter element after shutdown, and further reducing the TDS value of the first glass of water filtered by the filter element after restarting after shutdown. In addition, the water flow structure corresponding to the filter element in this embodiment has a more uniform water flow distribution compared with the water flow structure of the existing filter element, which can better avoid the problem of water flow stagnation or slow flow in local positions. And since the bottom of the filter element is the water storage space 104 for accommodating pure water, this can avoid the accumulation and residue of raw water and wastewater at the bottom of the filter element and generate a dead zone.

[0055] Optionally, referring to Figure 3 、 Figure 4 、 Figure 6 and Figure 7 ,the filter element further includes a first flow dividing cover 5. The first flow dividing cover 5 covers the upper end of the filter membrane body 4. A first annular channel 501 is formed on the lower end surface of the first flow dividing cover 5, and the first annular channel 501 is communicated with the upper end surface of the filter membrane body 4. An inlet channel 502 is provided in the first flow dividing cover 5. The upper end of the inlet channel 502 is communicated with the raw water inlet 101, and the lower end of the inlet channel 502 is communicated with the first annular channel 501.

[0056] While the first diversion cover 5 plays a role in connecting and fixing the filter membrane body 4, it can also achieve the connection between the filter membrane body 4 and the raw water inlet 101. Specifically, since the filter membrane body 4 is wound around the central water inlet pipe 2, the end face of the filter membrane body 4 is annular. Thus, the first annular channel 501 can be adapted to the shape of the upper end face of the filter membrane body 4. When the external raw water enters the water inlet channel 502 from the raw water inlet 101, the raw water can be more evenly distributed at various positions on the upper end face of the filter membrane body 4 via the first annular channel 501. Thereby, the raw water can flow downward at various positions in the circumferential direction of the filter membrane body 4 and complete the filtration. In this way, the filter membrane body 4 can be fully utilized, avoiding the problem that the raw water injected into the filter membrane body 4 from the raw water inlet 101 only concentrates on the area of the filter membrane body 4 opposite to the raw water inlet 101, resulting in excessive filtration pressure in this area while other areas are not fully utilized.

[0057] Optionally, referring to Figure 3 , Figure 4 , Figure 6 and Figure 7 , the center of the first diversion cover 5 has a receiving through-hole (not shown in the figure). The filter element further includes a first water path conversion member 6. The first water path conversion member 6 is disposed in the receiving through-hole. The first water path conversion member 6 has a boss portion 601 extending downward. The boss portion 601 is inserted and fitted with the upper end of the central water inlet pipe 2. A first water outlet channel 602 is provided in the first water path conversion member 6. The upper end of the first water outlet channel 602 is communicated with the waste water outlet 103. The lower end of the first water outlet channel 602 penetrates through the boss portion 601 and is communicated with the upper end of the central water outlet pipe 3.

[0058] Specifically, the first annular channel 501 can be arranged to surround the receiving through-hole. The circumferential side wall of the first water path conversion member 6 can be in sealing cooperation with the hole wall of the receiving through-hole through a sealing ring. The circumferential side wall of the boss portion 601 can be in sealing cooperation with the inner wall of the central water inlet pipe 2 through a sealing ring. In this way, while ensuring that the waste water in the central water outlet pipe 3 flows to the waste water outlet 103 through the first water outlet channel 602, it can avoid the problem that the raw water in the first annular channel 501, the waste water in the first water outlet channel 602, and the pure water in the central water inlet pipe 2 are mixed due to leakage at the connection, which damages the normal operation of the filter element, and ensures that the various water paths do not interfere with each other.

[0059] Optionally, referring to Figure 3 , Figure 4 , Figure 6 and Figure 7 , the filter element further includes a first sealing sleeve 7. The first sealing sleeve 7 is hermetically sleeved on the upper end of the central water outlet pipe 3. The outer wall of the first sealing sleeve 7 is in sealing cooperation with the inner wall of the upper end of the central water inlet pipe 2. The first sealing sleeve 7 is located below the boss portion 601.

[0060] Specifically, the first sealing sleeve 7 is located above the central water inlet hole 201. The inner side wall of the first sealing sleeve 7 can be in sealing fit with the outer wall of the central water outlet pipe 3 through a sealing ring, and the outer side wall of the first sealing sleeve 7 can be in sealing fit with the inner wall of the central water inlet pipe 2 through a sealing ring. In this way, it can be ensured that the pure water obtained after being filtered by the filter membrane body 4 can flow through the central water inlet hole 201 into the cavity between the central water inlet pipe 2 and the central water outlet pipe 3, and at the same time, it can avoid the mixing of the pure water and the wastewater in the central water outlet pipe 3, ensuring that the pure water water path and the wastewater water path do not interfere with each other.

[0061] Optionally, referring to Figure 3 , Figure 4 , Figure 6 and Figure 7 , a second water outlet channel 603 is provided in the first water path conversion member 6, and a third water outlet channel 503 is provided in the first shunt cover 5; one end of the third water outlet channel 503 communicates with the top of the water storage space 104, and the other end of the third water outlet channel 503 communicates with the accommodation through hole; one end of the second water outlet channel 603 communicates with the accommodation through hole, and the other end of the second water outlet channel 603 communicates with the pure water outlet 102.

[0062] Specifically, the second water outlet channel 603 extends from the circumferential side wall of the first water path conversion member 6 inward to the central position of the first water path conversion member 6, and then extends upward to be butted with the pure water outlet 102, and the second water outlet channel 603 is isolated from the first water outlet channel 602; the third water outlet channel 503 extends from the circumferential side wall of the first shunt cover 5 inward to the accommodation through hole, and the third water outlet channel 503 is isolated from the water inlet channel 502 and the first annular channel 501. The circumferential side wall of the first water path conversion member 6 can be in sealing fit with the hole wall of the accommodation through hole through at least two sealing rings. As Figure 7 shown, two adjacent sealing rings are arranged at intervals in the vertical direction, and an overflow space is formed between the two sealing rings. One end of the second water outlet channel 603 facing the outside and one end of the third water outlet channel 503 facing the inside can communicate with the overflow space, so as to realize the communication between the second water outlet channel 603 and the third water outlet channel 503.

[0063] In the actual application process, the pure water entering the water storage space 104 can flow upward to the circumferential side wall of the first shunt cover 5, and then flow through the third water outlet channel 503 and the second water outlet channel 603 in sequence to the pure water outlet 102. Based on the above water path structure setting, it can be ensured that the pure water water path does not interfere with the raw water in the first shunt cover 5 and the wastewater in the first water path conversion member 6.

[0064] Optionally, referring to Figure 3 , Figure 4 , Figure 6 and Figure 7, the upper end of the first water outlet channel 602 forms a first accommodation cavity (not shown in the figure) on the first water path conversion member 6; a first flange 105 extending downward is provided at the top of the housing 1, the first flange 105 is located in the first accommodation cavity, and the first flange 105 encloses a second accommodation cavity 1051, and the second accommodation cavity 1051 is respectively communicated with the other end of the second water outlet channel 603 and the pure water outlet 102; a first annular flow-through space 6021 is formed between the outer side wall of the first flange 105 and the cavity wall of the first accommodation cavity, and the first annular flow-through space 6021 is communicated with the waste water outlet 103.

[0065] Specifically, the pure water flowing out through the third water outlet channel 503 and the second water outlet channel 603 in sequence can enter the second accommodation cavity 1051 enclosed by the first flange 105 and flow from the second accommodation cavity 1051 to the pure water outlet 102; while the waste water flowing from the central water pipe 3 to the first water outlet channel 602 can enter the first annular flow-through space 6021 and flow from the first annular flow-through space 6021 to the waste water outlet 103. Based on the above water path arrangement, the first flange 105 can be used to separate the pure water path and the waste water path; in addition, by providing the first annular flow-through space 6021 for transition, even when the upper end outlet of the first water outlet channel 602 is not directly opposite to the waste water outlet 103, the connection between the first water outlet channel 602 and the waste water outlet 103 can still be achieved, thereby improving the flexibility of the water path arrangement.

[0066] Preferably, as Figure 6 and Figure 7 shown, the end of the second water outlet channel 603 is a tubular structure protruding upward, and a second sealing sleeve 8 is arranged in the second accommodation cavity 1051. The second sealing sleeve 8 is hermetically sleeved on the tubular structure through a sealing ring, and the outer wall of the second sealing sleeve 8 is also hermetically fitted with the inner side wall of the first flange 105 through a sealing ring. Based on this arrangement, the first annular flow-through space 6021 can be completely blocked from the second accommodation cavity 1051, avoiding the mixing of the waste water in the first annular flow-through space 6021 and the pure water in the second accommodation cavity 1051, and ensuring that the pure water path and the waste water path do not interfere with each other.

[0067] Optionally, referring to Figure 3 、 Figure 4 、 Figure 6 and Figure 7, the upper end of the water inlet passage 502 forms a third accommodation cavity (not shown in the figure) on the first diversion cover 5; the top of the housing 1 is also provided with a second flange 106 extending downward. The inner side wall of the second flange 106 is in sealing cooperation with the circumferential side of the first water path conversion member 6. A second annular flow-through space 5021 is formed between the outer side wall of the second flange 106 and the cavity wall of the third accommodation cavity. The lower end of the second annular flow-through space 5021 is communicated with the first annular passage 501.

[0068] Specifically, the inner side wall of the second flange 106 can be in sealing cooperation with the circumferential side wall of the first water path conversion member 6 through a sealing ring. The external raw water entering the raw water inlet 101 can flow to the first annular passage 501 through the second annular flow-through space 5021 and enter the filter membrane body 4 through the first annular passage 501 for filtration. Based on the sealing effect between the second flange 106 and the first water path conversion member 6, the raw water in the second annular flow-through space 5021 can be prevented from mixing with the wastewater in the first annular flow-through space 6021, ensuring that the raw water water path and the wastewater water path do not interfere with each other.

[0069] Optionally, referring to Figure 4 and Figure 8 , the filter element further includes a second water path conversion member 9. The second water path conversion member 9 is sealingly sleeved on the lower end of the central water outlet pipe 3. The outer wall of the second water path conversion member 9 is in sealing cooperation with the inner wall of the lower end of the central water inlet pipe 2. The second water path conversion member 9 is provided with a first flow-through channel 901 and a second flow-through channel 902. The upper end of the first flow-through channel 901 is communicated with the inner cavity of the central water inlet pipe 2, the lower end of the first flow-through channel 901 is communicated with the water storage space 104, the upper end of the second flow-through channel 902 is communicated with the inner cavity of the central water outlet pipe 3, and the lower end of the second flow-through channel 902 is communicated with the lower end of the filter membrane body 4.

[0070] Optionally, referring to Figure 4 and Figure 8 , the filter element further includes a second diversion cover 10. The second diversion cover 10 covers the lower end of the filter membrane body 4. The upper end surface of the second diversion cover 10 is provided with a fourth accommodation cavity. A flow-through hole 1002 is opened in the fourth accommodation cavity. The lower end of the central water inlet pipe 2 is sealingly fitted in the flow-through hole 1002. The lower end of the first flow-through channel 901 is communicated with the water storage space 104 through the flow-through hole 1002. A third annular flow-through space 1001 is formed by enclosing the cavity wall of the fourth accommodation cavity, the lower end surface of the filter membrane body 4, and the outer wall of the central water inlet pipe 2. The lower end of the central water inlet pipe 2 is provided with a third flow-through channel 202. One end of the third flow-through channel 202 is communicated with the third annular flow-through space 1001, and the other end of the third flow-through channel 202 is communicated with the lower end of the second flow-through channel 902.

[0071] Specifically, a fixed bushing 11 can be arranged between the first flow dividing cover 5 and the second flow dividing cover 10. The first flow dividing cover 5 and the second flow dividing cover 10 are respectively fixed to the upper and lower ends of the fixed bushing 11. The filter membrane body 4 is arranged in the inner cavity of the fixed bushing 11, and the upper and lower end faces of the filter membrane body 4 are respectively in contact with the first flow dividing cover 5 and the second flow dividing cover 10. In this way, the filter membrane body 4 and other devices can be encapsulated into a complete reverse osmosis membrane module by the first flow dividing cover 5, the fixed bushing 11 and the second flow dividing cover 10 together. Among them, there is a first reserved space between the bottom of the second flow dividing cover 10 and the bottom of the inner cavity of the housing 1, and there is a second reserved space between the outer wall of the fixed bushing 11 and the vertical side wall of the inner cavity of the housing 1. The first reserved space and the second reserved space together constitute a water storage space 104.

[0072] As Figure 8 shown, the flow-through hole 1002 can be set as a stepped hole, and the stepped hole includes an upper hole part with a larger diameter and a lower hole part with a smaller diameter; the lower end of the central water inlet pipe 2 is hermetically fitted in the lower hole part through a sealing ring and axially limited by its end face; the upper end of the second water path conversion part 9 is hermetically sleeved on the lower end of the central water outlet pipe 3 through a sealing ring, and the lower end of the second water path conversion part 9 is hermetically fitted with the inner wall of the lower end of the central water inlet pipe 2 through a sealing ring; the lower end of the first flow-through channel 901 communicates with the lower water storage space 104 through the lower hole part, and the upper end of the first flow-through channel 901 penetrates through the circumferential side wall of the second water path conversion part 9, and this penetration position is above the sealing position between the second water path conversion part 9 and the central water inlet pipe 2; the upper end of the second flow-through channel 902 communicates with the lower end of the central water outlet pipe 3, the lower end of the second flow-through channel 902 penetrates through the circumferential side wall of the second water path conversion part 9, and the third flow-through channel 202 is used to communicate the second flow-through channel 902 and the third annular flow-through space 1001 at the lower end of the filter membrane body 4. Preferably, the lower end of the second water path conversion part 9 can be hermetically fitted with the inner wall of the lower end of the central water inlet pipe 2 through at least two sealing rings. As Figure 8 shown, two adjacent sealing rings are arranged at intervals in the up and down direction, and an over-flow space is formed between the two sealing rings. One end of the second flow-through channel 902 facing the outside and one end of the third flow-through channel 202 facing the inside can communicate with the over-flow space, so as to realize the communication between the second flow-through channel 902 and the third flow-through channel 202.

[0073] Based on the above water path arrangement, the diversion of pure water and waste water can be realized between the central water inlet pipe 2 and the central water outlet pipe 3. Specifically, after the pure water obtained by filtering through the filter membrane body 4 enters the central water inlet hole 201 and flows to the lower end of the central water inlet pipe 2, it can flow to the lower water storage space 104 through the first flow-through channel 901; while the waste water flowing out from the lower end of the filter membrane body 4 can enter the third annular flow-through space 1001 and flow into the central water outlet pipe 3 through the third flow-through channel 202 and the second flow-through channel 902 in sequence.

[0074] Please refer to Figures 1 to 8 , the present utility model further provides a water purification system, including the filter element in any of the above embodiments.

[0075] In this embodiment, regarding the specific structure of the filter element, reference may be made to the above embodiments. Since the water purification system in this embodiment adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated herein one by one.

[0076] The above is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. A filter element, characterized in that, Comprising: A housing with an accommodation cavity provided therein; a raw water inlet, a pure water outlet, and a wastewater outlet communicating with the accommodation cavity are provided at the top of the housing. A central inlet pipe disposed in the accommodation cavity; central inlet holes are provided on the circumferential side of the central inlet pipe. A central outlet pipe disposed in the inner cavity of the central inlet pipe; the upper end of the central outlet pipe communicates with the wastewater outlet. A filter membrane body wound around the central inlet pipe and communicating with the central inlet holes; the upper end of the filter membrane body communicates with the raw water inlet, the lower end of the filter membrane body communicates with the lower end of the central outlet pipe, a water storage space is formed between the outer peripheral wall of the filter membrane body and the inner wall of the housing, the bottom of the water storage space communicates with the lower end of the central inlet pipe, and the top of the water storage space communicates with the pure water outlet.

2. The filter element according to claim 1, wherein, The filter element further includes a first flow dividing cover; the first flow dividing cover covers the upper end of the filter membrane body, a first annular channel is provided on the lower end surface of the first flow dividing cover and communicates with the upper end surface of the filter membrane body; an inlet channel is provided in the first flow dividing cover, the upper end of the inlet channel communicates with the raw water inlet, and the lower end of the inlet channel communicates with the first annular channel.

3. The filter element according to claim 2, wherein, A receiving through hole is provided at the center of the first flow dividing cover, the filter element further includes a first water path conversion member disposed in the receiving through hole, the first water path conversion member has a convex platform portion extending downward, and the convex platform portion is inserted and fitted with the upper end of the central inlet pipe; a first water outlet channel is provided in the first water path conversion member, the upper end of the first water outlet channel communicates with the wastewater outlet, and the lower end of the first water outlet channel penetrates through the convex platform portion and communicates with the upper end of the central outlet pipe.

4. The filter element according to claim 3, characterized in that, The filter element further includes a first sealing sleeve, the first sealing sleeve is sealingly sleeved on the upper end of the central outlet pipe, the outer wall of the first sealing sleeve is sealingly fitted with the inner wall of the upper end of the central inlet pipe, and the first sealing sleeve is located below the convex platform portion.

5. The filter element according to claim 3, wherein A second water outlet channel is provided in the first water path conversion member, and a third water outlet channel is provided in the first flow dividing cover; one end of the third water outlet channel communicates with the top of the water storage space, and the other end of the third water outlet channel communicates with the receiving through hole; one end of the second water outlet channel communicates with the receiving through hole, and the other end of the second water outlet channel communicates with the pure water outlet.

6. The filter element according to claim 5, characterized in that, The upper end of the first water outlet channel forms a first receiving concave cavity on the first water path conversion member; a first flange extending downward is provided at the top of the housing, the first flange is located in the first receiving concave cavity, and the first flange encloses a second receiving concave cavity, the second receiving concave cavity communicates with the other end of the second water outlet channel and the pure water outlet respectively; a first annular flow-through space is formed between the outer side wall of the first flange and the cavity wall of the first receiving concave cavity, and the first annular flow-through space communicates with the wastewater outlet.

7. The filter element according to claim 6, wherein, The upper end of the water inlet passage forms a third accommodation cavity on the first shunt cover; the top of the housing is further provided with a second flange extending downward, the inner side wall of the second flange is sealingly fitted with the peripheral side of the first water path conversion member, and a second annular flow-through space is formed between the outer side wall of the second flange and the cavity wall of the third accommodation cavity. The lower end of the second annular flow-through space is communicated with the first annular passage.

8. The filter element according to claim 1, wherein, The filter element further includes a second water path conversion member, the second water path conversion member is sealingly sleeved on the lower end of the central water outlet pipe, and the outer wall of the second water path conversion member is sealingly fitted with the inner wall of the lower end of the central water inlet pipe; a first flow-through passage and a second flow-through passage are provided in the second water path conversion member. The upper end of the first flow-through passage is communicated with the inner cavity of the central water inlet pipe, the lower end of the first flow-through passage is communicated with the water storage space, the upper end of the second flow-through passage is communicated with the inner cavity of the central water outlet pipe, and the lower end of the second flow-through passage is communicated with the lower end of the filter membrane body.

9. The filter element according to claim 8, wherein, The filter element further includes a second shunt cover, the second shunt cover covers the lower end of the filter membrane body; a fourth accommodation cavity is provided on the upper end surface of the second shunt cover, a flow-through hole is opened in the fourth accommodation cavity, the lower end of the central water inlet pipe is sealingly fitted in the flow-through hole, and the lower end of the first flow-through passage is communicated with the water storage space through the flow-through hole; a third annular flow-through space is enclosed between the cavity wall of the fourth accommodation cavity, the lower end surface of the filter membrane body, and the outer wall of the central water inlet pipe; a third flow-through passage is opened at the lower end of the central water inlet pipe, one end of the third flow-through passage is communicated with the third annular flow-through space, and the other end of the third flow-through passage is communicated with the lower end of the second flow-through passage.

10. A water purification system, characterized in that, Comprising a filter element according to any one of claims 1 to 9.

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