Filter element structure and water purification equipment applying same

Abstract

The utility model relates to a filter element structure and water purification equipment applying the filter element structure, and the filter element structure comprises a shell which is hollow inside and is provided with a first water inlet and a water purification port; the first filter element is arranged in the shell, the water inlet end of the first filter element is in fluid communication with the first water inlet, and the water purification end of the first filter element is in fluid communication with the water purification port; the second filter element is arranged in the first filter element; the shell is further provided with a second water inlet isolated from the first water inlet, the second water inlet is in fluid communication with the water inlet end of a second filter element, and the water purification end of the second filter element is in fluid communication with the water purification end of the first filter element. The filter element structure has the advantages that water enters the filter element structure through the second water inlet, the water purification end of the second filter element can flush the first filter element, the service life of the first filter element is prolonged, and when the first filter element is the first reverse osmosis filter element, the problem that the TDS of head cup water is too high can be solved.

Description

Technical Field

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

[0002] Existing water purification equipment mainly relies on membrane filter elements to filter raw water. When the water purification equipment is in standby mode, raw water, wastewater and pure water will exist in the membrane filter element at the same time, and the TDS concentration of raw water and wastewater is much higher than the TDS of pure water. If the water purification equipment is in standby mode for a long time, this will cause the ions in the raw water and wastewater to diffuse into the pure water, and then cause the next time the water purification equipment is turned on to extract pure water, the TDS concentration of the first cup of pure water will be relatively high, affecting the water quality of the outlet water.

[0003] To solve this technical problem, a Chinese utility model patent with patent number ZL 202220089599.0 (authorization announcement number CN217614028U) discloses a reverse osmosis water purification system for reducing the TDS of the first cup of water, including an inlet valve, a booster pump and a reverse osmosis filter element connected in sequence through pipelines, the clean water end of the reverse osmosis filter element is connected to the clean water outlet faucet through a pure water pipe, and the waste water end of the reverse osmosis filter element is connected to the waste water pipe to discharge the waste water. The system also includes a water tank, which is connected to the clean water end of the reverse osmosis filter element through a second pure water pipe, and the water tank is also connected to the booster pump through a flushing pipe.

[0004] Although the water purification system allows the water in the water tank to enter the concentrated water end of the reverse osmosis filter element through a booster pump, so that the TDS at the concentrated water end of the reverse osmosis filter element is reduced, so that there is no high TDS water in the reverse osmosis filter element, and the TDS at the pure water end will not increase due to forward osmosis after a long period of standby, the above-mentioned water purification system has the following limitations: the above-mentioned water purification system returns pure water to the raw water end of the reverse osmosis filter element by pure water reflux, and cannot achieve flushing of the filter element, and while the pure water is refluxed, waste water is generated, and the problem of excessively high TDS cannot be completely solved. Therefore, further improvements to the existing technology are needed. Utility Model Content

[0005] The first technical problem to be solved by the utility model is to provide a filter element structure capable of flushing the filter element in view of the above-mentioned prior art.

[0006] The second technical problem to be solved by the present invention is to provide a filter element structure capable of solving the problem of too high TDS of the first cup of water in view of the above-mentioned prior art.

[0007] The third technical problem to be solved by the utility model is to provide a water purification device using the above filter element structure.

[0008] The technical solution adopted by the utility model to solve the first technical problem is: a filter element structure, comprising:

[0009] The shell is hollow inside and has a first water inlet and a clean water outlet;

[0010] A first filter element is disposed in the housing, a water inlet end of the first filter element is in fluid communication with a first water inlet, and a water purification end of the first filter element is in fluid communication with the water purification port;

[0011] The invention is characterized in that it also includes:

[0012] A second filter element, disposed in the first filter element;

[0013] The shell also has a second water inlet isolated from the first water inlet, the second water inlet is fluidically connected to the water inlet end of the second filter element, and the clean water end of the second filter element is fluidically connected to the clean water end of the first filter element.

[0014] To solve the second technical problem mentioned above, the first filter element is a first reverse osmosis filter element, the shell is further provided with a first concentrated water outlet, and the first reverse osmosis filter element has a concentrated water end fluidly connected to the first concentrated water outlet.

[0015] Preferably, the first reverse osmosis filter element includes a first central tube and a first reverse osmosis membrane arranged circumferentially around the first central tube, the outer wall of the first reverse osmosis membrane forms a water inlet end, the end of the first reverse osmosis membrane close to the first concentrated water outlet forms a concentrated water end, the inner wall of the first reverse osmosis membrane forms a clean water end, a first water hole penetrating through the wall thickness of the first central tube is provided on the tube wall, the first end of the first central tube is fluidically connected to the clean water outlet, the second end of the first central tube is a blocked end, and the inner wall of the first reverse osmosis membrane is fluidically connected to the first central tube through the first water hole.

[0016] In order to detect water quality, a raw water cavity in fluid communication with the first water inlet is formed between the outer wall of the first reverse osmosis membrane and the inner wall of the shell, and a TDS probe extending into the raw water cavity is also provided on the shell.

[0017] Preferably, the second filter element is a second reverse osmosis filter element arranged in the first central tube, the second reverse osmosis filter element includes a second central tube and a second reverse osmosis membrane arranged circumferentially around the second central tube, one end of the second central tube is a blocked end, the other end of the second central tube is open and faces the first end of the first central tube, and the tube wall of the second central tube is provided with a second water hole penetrating the wall thickness.

[0018] To facilitate the isolation of the first water inlet and the second water inlet, the first water inlet and the second water inlet are respectively arranged at the two ends of the shell, and the second water inlet is opened on the wall contacted by the second end of the first center tube of the shell and is located in the first center tube.

[0019] In order to ensure that the second reverse osmosis filter element does not affect the normal operation of the first reverse osmosis filter element, a mounting tube extending toward the water purification port of the first reverse osmosis filter element is also provided in the first central tube, and a through hole is provided at the top of the mounting tube for inserting the open end of the second central tube, and the top of the mounting tube is lower than the first end of the first central tube, and the bottom of the mounting tube is sealed and connected to the center of the first central tube.

[0020] Preferably, the first water hole is formed on the outer peripheral wall of the first central tube surrounding the installation tube, and the installation tube and an end of the first central tube away from the water purification port form a cavity for installing the second reverse osmosis filter element therein.

[0021] To enable concentrated water from the second reverse osmosis filter to flow out, the first central tube is provided with a through hole near its first end, and the top of the mounting tube also extends toward the through hole to form a second concentrated water outlet fluidly connected to the concentrated water end of the second reverse osmosis filter.

[0022] The technical solution adopted by the utility model to solve the second technical problem is: a water purification device, characterized in that: the filter element structure as described above is applied.

[0023] Compared with the prior art, the utility model has the advantages that: by arranging the second filter element in the first filter element, and the housing further having a second water inlet isolated from the first water inlet, the first water inlet is in fluid communication with the first filter element, the second water inlet is in fluid communication with the water inlet end of the second filter element, and the clean water end of the second filter element is in fluid communication with the clean water end of the first filter element. Thus, the filter element structure can be flushed with the clean water end of the second filter element by taking in water through the second water inlet, thereby increasing the service life of the first filter element, and when the first filter element is a first reverse osmosis filter element, the problem of too high TDS in the first cup of water can be solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the filter element in the embodiment of the utility model;

[0025] Figure 2 for Figure 1 A cross-sectional view of

[0026] Figure 3 for Figure 2 Partial schematic diagram in;

[0027] Figure 4This is a water circuit diagram of the water purification equipment in the embodiment of the utility model. DETAILED DESCRIPTION

[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0029] like Figures 1 to 4 As shown, this embodiment relates to a filter element structure and a water purification device using the filter element structure.

[0030] The filter element structure includes a housing 1, a first filter element 2 and a second filter element 3. The housing 1 is hollow inside and has a first water inlet 1a, a clean water outlet 1b, a first concentrated water outlet 1c and a second water inlet 1d. Figure 2 As shown, the shell 1 in this embodiment is tubular, the first water inlet 1a, the clean water port 1b and the first concentrated water outlet 1c are arranged at the same end of the shell 1, and the second water inlet 1d is arranged at the other end of the shell 1; and the first water inlet 1a and the second water inlet 1d are isolated from each other, the first filter element 2 is arranged in the shell 1, the water inlet end of the first filter element 2 is fluidically connected with the first water inlet 1a, and the clean water end of the first filter element 2 is fluidically connected with the clean water port 1b; the second filter element 3 is arranged in the first filter element 2; the second water inlet 1d is fluidically connected with the water inlet end of the second filter element 3, and the clean water end of the second filter element 3 is fluidically connected with the clean water end of the first filter element 2.

[0031] The first filter element 2 is a first reverse osmosis filter element, and the first reverse osmosis filter element has a concentrated water end in fluid communication with the first concentrated water outlet 1c; Figure 2 As shown, the first reverse osmosis filter element in this embodiment includes a first central tube 21 and a first reverse osmosis membrane 22 arranged circumferentially around the first central tube 21, the outer wall of the first reverse osmosis membrane 22 forms a water inlet end 220, the end of the first reverse osmosis membrane 22 close to the first concentrated water outlet 1c forms a concentrated water end 221, the inner wall of the first reverse osmosis membrane 22 forms a clean water end 222, the tube wall of the first central tube 21 is provided with a first water hole 211 penetrating through the wall thickness thereof, the first end of the first central tube 21 is fluidically connected to the clean water outlet 1b, the second end of the first central tube 21 is a blocked end, and the inner wall of the first reverse osmosis membrane 22 is fluidically connected to the first central tube 21 through the first water hole 211.

[0032] In addition, the second filter element 3 is a second reverse osmosis filter element arranged in the first central tube 21. Figure 2As shown, the second reverse osmosis filter element in this embodiment includes a second central tube 31 and a second reverse osmosis membrane 32 arranged circumferentially around the second central tube 31, one end of the second central tube 31 is a blocked end, and the other end of the second central tube 31 is open and faces the first end of the first central tube 21, and a second water hole 311 penetrating through the wall thickness of the second central tube 31 is provided on the tube wall. The water purification process of the second reverse osmosis filter element is the same as the water purification process of the first reverse osmosis filter element, and its specific reference may be made to the working process of the reverse osmosis filter element, that is, water enters the reverse osmosis membrane from the outside of the reverse osmosis membrane, and clean water is generated on the inside of the reverse osmosis membrane, and the clean water flows into the central tube through the water hole opened on the tube wall of the central tube, and then flows out through the opening at one end of the central tube. The working process of the reverse osmosis filter element is the prior art.

[0033] The outer wall of the first reverse osmosis membrane 22 and the inner wall of the shell 1 form a raw water chamber 20 in fluid communication with the first water inlet 1a. The shell 1 is also provided with a TDS probe 4 extending into the raw water chamber 20. The second water inlet 1d is opened on the wall surface contacted by the second end of the first central tube 21 of the shell 1 and is located in the first central tube 21. Figure 2 As shown, the TDS probe 4 and the second water inlet 1d in this embodiment are arranged on the same end of the housing 1.

[0034] The first central tube 21 is also provided with a mounting tube 5 extending toward the water purification port 1b of the first reverse osmosis filter element. The top of the mounting tube 5 is provided with a through hole 51 for inserting the opening end of the second central tube 31. The top of the mounting tube 5 is lower than the first end of the first central tube 21. The bottom of the mounting tube 5 is sealed and connected to the center of the first central tube 21. Figure 3 As shown, the first water hole 211 in this embodiment is opened on the outer peripheral wall of the first central tube 21 surrounding the installation tube 5, and the installation tube 5 and the end of the first central tube 21 away from the water purification port 1b form a cavity 50 for installing the second reverse osmosis filter element therein.

[0035] The first central tube 21 is provided with a through hole 212 near its first end, and the top of the mounting tube 5 is also extended toward the through hole 212 to form a second concentrated water outlet 52 in fluid communication with the concentrated water end of the second reverse osmosis filter element. In this way, the second concentrated water outlet 52 and the concentrated water end of the first reverse osmosis filter element are both in fluid communication with the first concentrated water outlet 1c, so that the concentrated water can be discharged through the first concentrated water outlet 1c.

[0036] like Figure 4As shown, the water purification equipment includes a pipeline 6 and a pre-filter element 71, a reverse osmosis filter element 72, a post-filter element 73 and a water outlet valve 95 which are arranged on the pipeline 6 in sequence. The reverse osmosis filter element 72 adopts the filter element structure in this embodiment. Since two reverse osmosis filter elements are arranged in the filter element structure, the pipeline 6 is connected to the first water inlet 1a and the second water inlet 1d of the filter element structure through two branch pipes. A valve is provided on each branch pipe. In this embodiment, the two valves are a first valve 91 and a second valve 92. A booster pump 81 is also provided between the pre-filter element 71 and the reverse osmosis filter element 72. The first concentrated water outlet 1c of the filter element structure is connected to a wastewater pipe 10, and a wastewater valve 93 is provided on the wastewater pipe 10. The downstream of the second valve 92 of the pipeline 6 is directly connected between the reverse osmosis filter element 72 and the post-filter element 73 through another pipe, and a third valve 94 is provided on the pipe.

[0037] The pre-filter element in this embodiment can be a composite of a polypropylene melt-blown filter element and a carbon rod, or a carbon fiber filter element, etc. The post-filter element can be a carbon rod filter element, a particle detection filter element, or a composite filter element of a carbon rod and ultrafiltration.

[0038] The working process of the water purification equipment in this embodiment is as follows:

[0039] Normal water production mode:

[0040] The booster pump 81 and the second valve 92 are turned on, and the first valve 91 and the third valve 94 are closed; the wastewater valve 93 is in a normally closed state, and the outlet valve 95 is turned on to produce water. That is, the first reverse osmosis filter element works, and the second reverse osmosis filter element does not work;

[0041] Flushing mode:

[0042] The boost pump 81, the first valve 91 and the third valve 94 are turned on, the second valve 92 is closed, and the wastewater valve 93 is opened for N seconds and then kept in a normally closed state (the purpose of opening the concentrated water solenoid valve for N seconds is to allow the raw water and wastewater of the first reverse osmosis filter element to be quickly emptied; then the clean water produced by the second reverse osmosis filter element is supplemented to the raw water end of the first reverse osmosis filter element), in this embodiment, N=3; the outlet valve 95 is closed, that is, the first reverse osmosis filter element does not work, and the clean water produced by the second reverse osmosis filter element flushes the first reverse osmosis filter element.

[0043] In this embodiment, the TDS probe 4 is used to detect the TDS value of the raw water during normal water production and the TDS value of the raw water when the water purification equipment is shut down. When the difference between the two is greater than a threshold value, the different values ​​of the raw water TDS value when the water purification equipment is shut down are combined to determine whether the flushing mode needs to be turned on and when it is appropriate to stop flushing, which can maximize the cleanliness of the filter element structure.

[0044] 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 filter element structure, comprising: The shell (1) is hollow inside and has a first water inlet (1a) and a clean water outlet (1b); A first filter element (2) is arranged in the housing (1), the water inlet end of the first filter element (2) is in fluid communication with the first water inlet (1a), and the water purification end of the first filter element (2) is in fluid communication with the water purification port (1b); The invention is characterized in that it also includes: A second filter element (3) is arranged in the first filter element (2); The housing (1) also has a second water inlet (1d) isolated from the first water inlet (1a); the second water inlet (1d) is fluidically connected to the water inlet end of the second filter element (3); and the clean water end of the second filter element (3) is fluidically connected to the clean water end of the first filter element (2).

2. The filter element structure according to claim 1, characterized in that: The first filter element (2) is a first reverse osmosis filter element, and the housing (1) is also provided with a first concentrated water outlet (1c). The first reverse osmosis filter element has a concentrated water end fluidically connected to the first concentrated water outlet (1c).

3. The filter element structure according to claim 2, characterized in that: The first reverse osmosis filter element comprises a first central tube (21) and a first reverse osmosis membrane (22) arranged circumferentially around the first central tube (21); the outer wall of the first reverse osmosis membrane (22) forms a water inlet end (220); the end of the first reverse osmosis membrane (22) close to the first concentrated water outlet (1c) forms a concentrated water end (221); the inner wall of the first reverse osmosis membrane (22) forms a clean water end (222); a first water passage hole (211) penetrating the wall thickness of the first central tube (21) is provided on the tube wall; the first end of the first central tube (21) is fluidically connected to the clean water outlet (1b); the second end of the first central tube (21) is a blocking end; the inner wall of the first reverse osmosis membrane (22) is fluidically connected to the first central tube (21) through the first water passage hole (211).

4. The filter element structure according to claim 3, characterized in that: A raw water chamber (20) in fluid communication with the first water inlet (1a) is formed between the outer wall of the first reverse osmosis membrane (22) and the inner wall of the shell (1), and a TDS probe (4) extending into the raw water chamber (20) is also provided on the shell (1).

5. The filter element structure according to claim 3 or 4, characterized in that: The second filter element (3) is a second reverse osmosis filter element arranged in the first central tube (21), the second reverse osmosis filter element comprising a second central tube (31) and a second reverse osmosis membrane (32) arranged circumferentially around the second central tube (31), one end of the second central tube (31) being a blocked end, the other end of the second central tube (31) being open and facing the first end of the first central tube (21), and a second water passage hole (311) penetrating the wall of the second central tube (31) being provided.

6. The filter element structure according to claim 5, characterized in that: The first water inlet (1a) and the second water inlet (1d) are respectively arranged at the two ends of the shell (1); the second water inlet (1d) is opened on the wall surface of the shell (1) contacted by the second end of the first central tube (21) and is located inside the first central tube (21).

7. The filter element structure according to claim 6, characterized in that: The first central tube (21) is also provided with a mounting tube (5) extending toward the water purification port (1b) of the first reverse osmosis filter element, the top of the mounting tube (5) is provided with a through hole (51) for inserting the open end of the second central tube (31), the top of the mounting tube (5) is lower than the first end of the first central tube (21), and the bottom of the mounting tube (5) is sealed and connected to the center of the first central tube (21).

8. The filter element structure according to claim 7, characterized in that: The first water passage hole (211) is formed on the outer peripheral wall of the first central tube (21) surrounding the installation tube (5), and the installation tube (5) and an end of the first central tube (21) away from the water purification port (1b) form a cavity (50) for installing a second reverse osmosis filter element therein.

9. The filter element structure according to claim 8, characterized in that: The first central tube (21) is provided with a through hole (212) at a position close to the first end thereof, and the top of the mounting tube (5) also extends toward the through hole (212) to form a second concentrated water outlet (52) in fluid communication with the concentrated water end of the second reverse osmosis filter element.

10. A water purification device, characterized in that: The filter element structure as described in any one of claims 1 to 9 is used.

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