Filter device and filter system

Abstract

The present invention discloses a filtering device and a filtering system, wherein the filtering device comprises a housing, a filter element, a raw water water passage, a pure water water passage and a concentrated water water passage, the raw water water passage comprises a raw water inlet arranged on the housing, the pure water water passage comprises a central tube arranged in the filter element and a pure water outlet arranged on the housing, the concentrated water water passage comprises a concentrated water outlet arranged on the housing, the bottom end of the filter element is connected with the raw water water passage for raw water to enter, and the top end thereof is connected with the concentrated water water passage for concentrated water to discharge; in addition, a water storage component is also included; the water storage component is connected with the raw water water passage, and the raw water is stored when the filtering device is running, and the stored raw water is pushed into the filter element through the bottom end of the filter element by air pressure when the filtering device stops for flushing. The filtering device and filtering system adopting the above structure can effectively reduce the TDS value of the first cup of water and extend the service life of the filter element by storing water in the water storage component to backwash the filter element.

Description

Technical Field

[0001] The invention relates to the technical field of filter elements, and in particular to a filtering device and a filtering system. Background Art

[0002] The main component of the reverse osmosis water purification device is the reverse osmosis membrane filter element, which generally has three water inlets and outlets: water inlet, pure water outlet and concentrated water outlet. Its structure generally includes core material, filter element shell and central tube. The core material is wound around the central tube, and the filter element shell is set on the outer wall of the core material, so that raw water can only enter from one end of the filter element, and concentrated water can only flow out from the other end of the filter element. At the same time, the central tube wall is provided with a number of water holes for receiving pure water. By pressurizing one side of the water inlet, municipal tap water enters the filter element through the water inlet, and then filters the tap water through the reverse osmosis membrane, and the filtered pure water is discharged to the water storage tank or faucet through the pure water outlet. Various heavy metal ions, impurities and harmful substances that cannot penetrate the reverse osmosis membrane accumulate on the concentrated water side and are discharged through the concentrated water outlet.

[0003] When the reverse osmosis water purification device is shut down, the booster pump installed on the water inlet side stops working. At this time, some concentrated water that has not been discharged remains on the concentrated water side of the reverse osmosis filter element, and some pure water also remains on the pure water side. Under the action of osmotic pressure caused by the difference in ion concentration in the water, the salt ions on the concentrated water side will penetrate into the pure water side. After a long period of shutdown, the ion concentration measured in the pure water will rise to a higher state, resulting in a higher TDS (Total dissolved solids) value of the pure water in the membrane, and ultimately causing the TDS value of the first cup of water flowing out of the faucet after the device is turned on again to be too high, which is not conducive to human drinking. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned defects or problems existing in the background technology, and to provide a filtering device and a filtering system, which can reduce the TDS value of the pure water side after shutdown, and solve the problem of too high TDS value of the first cup of water in the reverse osmosis water purification device.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The first technical solution: a filtering device, comprising an outer shell, a filter element, a raw water passage, a pure water passage and a concentrated water passage, the raw water passage comprising a raw water inlet arranged on the outer shell, the pure water passage comprising a central tube arranged in the filter element and a pure water outlet arranged on the outer shell, the concentrated water passage comprising a concentrated water outlet arranged on the outer shell, the bottom end of the filter element is connected with the raw water passage for raw water to enter, and the top end of the filter element is connected with the concentrated water passage for concentrated water to discharge; in addition, it also includes a water storage component; the water storage component is connected with the raw water passage, stores raw water when the filtering device is running, and uses air pressure to push the stored raw water into the filter element through the bottom end of the filter element for flushing when the filtering device stops.

[0007] The second technical solution based on the first technical solution: the water storage component is a raw water chamber formed by the space between the outer shell and the filter element, which is connected to the bottom end of the filter element and isolated from the top end of the filter element, and the air inside it exerts pressure on the raw water entering the raw water chamber.

[0008] A third technical solution based on the first technical solution: the water storage component includes a first air bag water tank located outside the outer shell and connected to the raw water inlet, which has an air cavity and an elastic film for sealing the air cavity; when the filtering device is running, the raw water enters the first air bag water tank and squeezes the air in the air cavity through the elastic film to store energy; when the filtering device stops, the compressed air expands and squeezes the stored raw water through the elastic film so that it passes through the raw water water path to reach the bottom of the filter element.

[0009] A fourth technical solution based on the third technical solution: the water storage component also includes a water storage cavity, which is formed by the space between the outer shell and the filter element, and is connected to the bottom end of the filter element and isolated from the top end of the filter element.

[0010] The fifth technical solution based on any one of the second to fourth technical solutions: it also includes a water inlet pipe, the top end of which is connected to the raw water inlet, and the bottom end is connected to the raw water cavity; the water inlet pipe is sleeved in the central tube, and the pure water generated after filtering by the filter element enters the gap between the central tube and the water inlet pipe and then flows to the pure water outlet.

[0011] The sixth technical solution based on the fifth technical solution: a first limiting protrusion is provided on the inner wall of the central tube near the bottom end, and a second limiting protrusion matching the first limiting protrusion is provided at a corresponding position on the outer wall of the water inlet pipe; the second limiting protrusion is used to push against the first limiting protrusion to fix the water inlet pipe; the first limiting protrusion extends toward the bottom end of the central tube to form a sealing wall, and when the water inlet pipe is fixed to the central tube, the outer wall of the water inlet pipe is sealed with the sealing wall.

[0012] The seventh technical scheme based on the fifth technical scheme: a protruding first annular portion is provided at the top inner side of the shell, and the top end of the water inlet pipe is sealed with the inward side wall of the first annular portion and is connected to the raw water inlet; a protruding second annular portion is provided at the top inner side of the shell, which is concentric with the first annular portion and located outside the first annular portion, and the top end of the center pipe is sealed with the inward side wall of the second annular portion and is matched with the outward side wall of the first annular portion to form a water path connected to the pure water outlet.

[0013] An eighth technical solution based on the seventh technical solution: a third annular portion concentric with the second annular portion and located outside the second annular portion is provided at the inner top end of the shell, and the seal cooperates with the inward side wall of the third annular portion in a sealing manner and cooperates with the outward side wall of the second annular portion to form a water path connected to the concentrated water outlet.

[0014] The ninth technical scheme based on the eighth technical scheme: also includes a sealing member; the sealing member includes an annular covering plate, and both side edges of the covering plate extend in vertical directions opposite to each other to form a first connecting portion and a second connecting portion; the first connecting portion is fixedly connected to the filter element along the circumferential direction, and the second connecting portion is sealedly matched with the inward side wall of the third annular portion and matched with the outward side wall of the second annular portion to form a water path connected to the concentrated water outlet.

[0015] A tenth technical solution based on the fifth technical solution: a support bar is provided at the inner bottom end of the shell, and the support bar presses against the filter element to connect the water inlet pipe to the raw water cavity.

[0016] The present invention also provides an eleventh technical solution, which includes a filtering device as described in any one of the first to eleventh technical solutions; in addition, it also includes:

[0017] A raw water inlet pipeline, which is connected to the raw water inlet and is provided with a solenoid valve and a pressure pump;

[0018] A pure water outlet pipeline, one end of which is connected to the pure water outlet, and the other end of which is connected to the water outlet faucet;

[0019] The concentrated water outlet pipeline is connected with the concentrated water outlet and is provided with a flushing valve.

[0020] From the above description of the present invention, it can be seen that compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. A water storage component is provided to store raw water when the filter device is running, and to discharge the raw water by air pressure when the filter device stops, so that the raw water can still flow when the filter device stops, thereby flushing the inside of the filter element, reducing the TDS value of the water in the filter element in the shutdown state, and thus reducing the problem of too high TDS value of the first cup of water caused by osmotic pressure after a long period of shutdown; in addition, the water storage component is directly connected to the raw water water passage, which can reduce the structural complexity of the filter device, and there is no need to add corresponding valves or pipelines, thereby reducing the manufacturing cost of the filter device.

[0022] 2. There is air in the raw water cavity, and because it is connected to the bottom of the filter element, the raw water will enter the raw water cavity from the bottom of the raw water cavity, thereby squeezing the existing air. When the filtering device stops, the concentrated water outlet releases pressure, causing the pressure in the raw water cavity to be unbalanced, and the volume of the compressed air expands, thereby squeezing the raw water occupying the space into the filter element.

[0023] 3. When the pressure is unbalanced, the airbag water tank can automatically squeeze the stored pure water into the raw water passage, so as to flush the filter element when the filtering device stops.

[0024] 4. A water storage chamber is set up. When there is air inside it, it can play the same role as the raw water chamber. On this basis, it is also connected with the air bag water tank to avoid the decrease in drainage capacity after the air in the water storage chamber escapes. In addition, if there is no air in the water storage chamber, by connecting it with the air bag water tank, the function of the air bag water tank can be used to squeeze the raw water into the filter element for flushing.

[0025] 5. Set up a water inlet pipe so that the raw water enters from the bottom of the filter element, which is convenient for pipe arrangement in the filter device and can increase the life of the filter element; the water inlet pipe is fixedly connected to the center pipe, which is easy to assemble and can also reduce the volume of the filter device.

[0026] 6. A first limiting protrusion is set on the inner wall of the central tube, and a second limiting protrusion is set on the outer wall of the water inlet pipe, and the position of the water inlet pipe is fixed by the top limit.

[0027] 7. A first annular portion is provided so that the water inlet pipe can be connected to the water inlet and the sealing can be ensured when the filter device is assembled; a second annular portion is provided so that the central tube can be connected to the pure water outlet and the sealing can be ensured when the filter device is assembled; a third annular portion is provided so that the sealing member can be connected to the concentrated water outlet and the sealing can be ensured when the filter device is assembled.

[0028] 8. The first connecting portion of the seal is fixedly connected to the filter element shell along the circumferential direction, and together with the covering plate, it surrounds the top end face of the filter element. Then, through the sealing cooperation of the second connecting portion and the third annular portion, the concentrated water outlet end of the filter element is isolated from the raw water cavity, so that the concentrated water can only flow out from the concentrated water outlet.

[0029] 9. A support bar is provided to form a space for connecting the water inlet pipe with the raw water cavity between the bottom end of the filter element and the bottom end of the inner side of the shell when the filter element is assembled into the shell.

[0030] 10. A solenoid valve is set in the filtration system to control the on-off of the raw water inlet pipeline. The pressure pump is used to pressurize the raw water so that it enters the filter element for filtration. The water outlet faucet is used to control the opening and closing and water outlet of the pure water outlet pipeline. The flushing valve is used to adjust the water flow rate of the concentrated water outlet pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A schematic structural diagram of a filtering device according to an embodiment of the present invention;

[0033] Figure 2 for Figure 1 The structural diagram of part A in the figure;

[0034] Figure 3 for Figure 1 The structural diagram of part B;

[0035] Figure 4 for Figure 1 Schematic diagram of the structure of the middle filter element, water inlet pipe and sealing parts;

[0036] Figure 5 for Figure 1 Schematic diagram of the structure of the middle shell;

[0037] Figure 6 A schematic structural diagram of a second embodiment of a filtering device provided by the present invention;

[0038] Figure 7 This is a schematic structural diagram of Example 3 of a processing device provided by the present invention.

[0039] Description of main reference numerals:

[0040] 10. Outer shell; 11. Raw water inlet; 12. Pure water outlet; 13. Concentrated water outlet; 14. Support bar; 15. First annular portion; 16. Second annular portion; 17. Third annular portion; 21. Filter material; 22. Center tube; 221. First limiting protrusion; 2211. Sealing wall; 222. Through hole; 23. Sealing element; 231. Covering plate; 232. First connecting portion; 233. Second connecting portion; 24. Filter element shell; 30. Water inlet pipe; 31. Second limiting protrusion; 40. Raw water chamber; 41. Airbag water tank; 42. Water storage chamber. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are preferred embodiments of the present invention and should not be regarded as excluding other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the claims, description and the above-mentioned drawings of the present invention, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. are for distinguishing different objects rather than for describing a specific order.

[0043] In the claims, specification and the above-mentioned drawings of the present invention, unless otherwise explicitly defined, directional words, such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific protection scope of the present invention.

[0044] In the claims, specification and the above drawings of the present invention, unless otherwise clearly defined, if the term "fixed connection" or "fixed connection" is used, it should be understood in a broad sense, that is, any connection method without a displacement relationship and relative rotation relationship between the two, that is to say, including non-detachable fixed connection, detachable fixed connection, integrated connection and fixed connection through other devices or elements.

[0045] In the claims, description and drawings of the present invention, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0046] See also Figure 1 , Figure 1The schematic diagram of the structure of the embodiment 1 of a filtering device provided by the present invention is shown, which includes a housing 10, a filter element, a sealing member 23 and a water inlet pipe 30.

[0047] The housing 10 includes a shell and a cover. Figure 5 As shown, the cover is the bottom part of the housing 10, and the shell is the other part of the housing 10 except the cover. The shell is used to accommodate the filter element, the water inlet pipe 30 and the seal 23, and the cover is used to be fixedly connected with the shell to form a complete housing 10. After the filter element, the seal 23 and the water inlet pipe 30 are assembled into the shell, the cover is sealed and fixedly connected with the lower end of the shell by welding, screwing, etc. In addition, the overall shape of the housing 10 is cylindrical, and can also be prismatic.

[0048] The upper end of the housing 10 is provided with a raw water inlet 11, a pure water outlet 12 and a concentrated water outlet 13, which are arranged as concentric annular through groove structures, and a connecting structure for connection and fixing is arranged inside each through groove structure. Of course, the shapes of the raw water inlet 11, the pure water outlet 12 and the concentrated water outlet 13 can match the overall shape of the housing 10 to form a circular ring or a square frame, or they can not match the overall shape of the housing 10, and only need to provide the functions of water inlet and outlet and matching with external devices. Figure 1 As shown, the center is the raw water inlet 11, the raw water inlet 11 is the pure water outlet 12, and the pure water outlet 12 is the concentrated water outlet 13. The raw water inlet 11 is connected to the external water inlet pipe and receives the inlet water under the action of the pressurizing device, and the inlet water can be municipal tap water.

[0049] A first annular portion 15, a second annular portion 16 and a third annular portion 17 are provided at the inner top of the housing 10. The three annular portions 15, 16 and 17 are provided as concentric annular protrusion structures. Figure 1 As shown, the side wall of the first annular portion 15 surrounds and forms a cylindrical groove structure, the top surface of which is connected to the raw water inlet 11, the side wall of the second annular portion 16 cooperates with the side wall of the first annular portion 15 to form an annular groove structure, the top surface of which is connected to the pure water outlet 12, and the side wall of the third annular portion 17 cooperates with the side wall of the second annular portion 16 to form an annular groove structure, the top surface of which is connected to the concentrated water outlet 13. Similarly, the shapes of the first annular portion 15, the second annular portion 16 and the third annular portion 17 may match or not match the overall shape of the housing 10. In particular, the bottom ends of the first annular portion 15, the second annular portion 16 and the third annular portion 17 are located in the same plane.

[0050] like Figure 4As shown, the filter element includes a filter material 21, a central tube 22 and a filter element shell 24, wherein the filter material 21 can be a reverse osmosis membrane and a water-blocking net, a screen, etc., which are wound together with the central tube 22 as the center of the circle, and the filter element shell 24 is arranged on the outer wall of the filter material 21 so that only the top and bottom ends of the filter material are exposed. In addition, the filter material 21 can also be a material such as a nanofiltration membrane that can filter metal ions in water.

[0051] The central tube 22 is arranged at the center of the filter material 21, and a plurality of through holes 222 are arranged on its wall. The pure water formed after the influent water passes through the filter material enters the central tube 22 through the through holes 222. Figure 2 As shown, the upper end of the center tube 22 is connected to the pure water outlet 12. In the present embodiment, the upper end of the center tube 22 is inserted into the annular groove formed by the cooperation of the first annular portion 15 and the second annular portion 16. The outer wall of the upper end of the center tube 22 matches the shape of the inward side wall of the second annular portion 16 to form a plug-in relationship. A sealing ring is also sleeved on the outer wall of the upper end of the center tube 22 to form a sealing match with the inward side wall of the second annular portion 16. At the same time, the wall thickness of the center tube 22 is smaller than the width of the annular groove formed by the cooperation of the first annular portion 15 and the second annular portion 16. Therefore, after the center tube 22 is inserted into the annular groove, a gap for water to flow through will be formed between the inner side wall of the center tube 22 and the outward side wall of the first annular portion 15. At the same time, since the top surface of the annular groove formed by the second annular portion 16 is connected to the pure water outlet 12, the center tube 22 can be connected to the pure water outlet 12.

[0052] The water inlet pipe 30 is connected to the raw water inlet 11, and can guide the water from the raw water inlet 11 to below the bottom of the filter element. Figure 4 As shown, the water inlet pipe 30 is arranged to be fixedly mounted in the central tube 22, and the gap formed by the outer wall of the water inlet pipe 30 and the inner wall of the central tube 22 forms a pure water outlet channel connected to the pure water outlet 12. Figure 3As shown, a first limiting protrusion 221 is provided at a position near the lower end of the inner wall of the central tube 22. The first limiting protrusion 221 is an annular protrusion structure formed by extending the inner wall surface of the central tube 22 inwardly, and it also includes a sealing wall 2211 obtained by continuing to extend downward from the extended free end. A second annular limiting protrusion 31 is provided at a position near the lower end of the water inlet pipe 30. The size of the second limiting protrusion 31 can match the size of the first limiting protrusion 221. After the lower end of the water inlet pipe 30 passes through the first limiting protrusion 221, the second limiting protrusion 31 can press against the upper edge of the first limiting protrusion 221, thereby fixing the water inlet pipe 30. At the same time, a sealing ring is provided at the position where the water inlet pipe 30 is inserted into the sealing wall 2211. The size of the water inlet pipe 30 at this position matches the size of the sealing structure, so that the pure water outlet forms a closed structure here, and the water in the water inlet pipe 30 can flow to the bottom of the filter element.

[0053] In addition, a through hole 222 may or may not be provided on the tube wall of the central tube 22 below the water inlet pipe 30 . When the through hole 222 is provided, part of the pure water will mix with the inlet water, further reducing the TDS value of the water flow that flushes the filter material 21 .

[0054] like Figure 2 As shown, the upper end of the water inlet pipe 30 is connected to the raw water inlet 11. In the present embodiment, the upper end of the water inlet pipe 30 is inserted into a cylindrical groove formed by the side wall of the first annular portion 15. The outer wall of the upper end of the center pipe 30 matches the shape of the inward side wall of the first annular portion 15 to form a plug-in relationship. A sealing ring is also provided on the outer wall of the upper end of the water inlet pipe 30 to form a sealing fit with the inward side wall of the first annular portion 15. Since the top surface of the cylindrical groove formed by the first annular portion 15 is connected to the raw water inlet 11, the water inlet pipe 30 can be connected to the raw water inlet 11.

[0055] The structure of the sealing member 23 is as follows: Figure 4 As shown, it includes a covering plate 231 and a first connecting portion 232 and a second connecting portion 233. Specifically, the shape of the covering plate 231 is consistent with the cross-section of the filter element, and can be a circular ring or a square frame structure, with a hole formed in the middle for the center pipe 22 and the water inlet pipe 30 to pass through. The covering plate 231 has a side at the hole, and another side at its outer edge. The first connecting portion 232 is formed by extending along the side at the outer edge in a downward vertical direction, and then is fixedly connected to the filter element shell 24, thereby forming a covering effect on the top end face of the filter element. The second connecting portion 233 is formed by extending along the side at the hole in an upward vertical direction, and then is sealed with the third annular portion 17. Specifically, as Figure 2As shown, the second connecting portion 233 is inserted into the annular groove formed by the second annular portion 16 and the third annular portion, and the outer wall of the second connecting portion 233 matches the shape of the inward side wall of the third annular portion 17 to form a plug-in relationship. A sealing ring is also sleeved on the outer wall of the second connecting portion 233 to form a sealing match with the inward side wall of the third annular portion 17. At the same time, the thickness of the second connecting portion 233 is less than the width of the annular groove formed by the second annular portion 16 and the third annular portion 17. Therefore, after the second connecting portion 233 is inserted into the annular groove, a gap for water to flow through will be formed between the inner side wall of the second connecting portion 233 and the outward side wall of the second annular portion 16. At the same time, since the top surface of the annular groove formed by the third annular portion 17 is connected to the concentrated water outlet 13, the top end surface of the filter element can be connected to the concentrated water outlet 13 without mixing with the incoming water.

[0056] like Figure 5 As shown, a support bar 14 is provided at the bottom end of the outer shell 10, and the bottom end of the filter element abuts against the support bar 14, thereby forming a space between the bottom end surface of the filter element and the bottom of the outer shell 10, so that the water inlet pipe 30 can be connected to the bottom end surface of the filter element, so that the incoming water can enter the filter material 21 through the bottom end surface of the filter element.

[0057] The filter device also includes a water storage component, which stores raw water when the filter device is working, and pressurizes the stored raw water to make it enter the filter element when the filter device stops working. Specifically, in this embodiment, a raw water chamber 40 is formed between the inner wall of the outer shell 10 and the filter element shell 24 of the filter element, and the raw water chamber 40 is connected to the bottom end of the filter element. The raw water chamber 40 is filled with air. After the raw water enters the raw water chamber 40 through the raw water inlet 11 and the water inlet pipe 30, the raw water squeezes the original air, compresses the air and pressurizes the raw water in the raw water chamber 40. When the water inlet stops, the air pressure in the raw water chamber 40 will push the raw water into the filter element.

[0058] During assembly, first fix the first connection portion 232 of the seal 23 to the filter element shell 24 on the upper part of the filter element, then insert the water inlet pipe 30 into the center tube 22 so that it abuts against the limit portion 221, and then insert the filter element as a whole upward into the shell, so that the water inlet pipe 30, the center tube 22 and the seal 23 form a plug-in relationship with the first annular portion 15, the second annular portion 16 and the third annular portion 17 on the shell, and then weld the cover body to the shell.

[0059] When in use, the filter device is assembled into the water filtration system, and after the water inlet pressure device is turned on, tap water flows in from the water inlet pipe 30 and is guided to the space at the bottom of the filter element. At this time, part of the tap water enters the filter material 21 from the bottom to the top from the bottom end face of the filter element for filtering, and part of the tap water enters the raw water chamber 40 between the outer shell 10 and the filter element shell 24, and squeezes the air originally in the raw water chamber 40. When the pressure is balanced, the air is no longer squeezed, and tap water is stored in the raw water chamber 40. When the system is shut down, the pressure at the concentrated water outlet 13 is lower than the pressure at the raw water chamber 40, so the tap water at the raw water chamber 40 will flow into the filter material 21 from the bottom end face of the filter element, thereby flushing the filter material 21, reducing the TDS value of the water in the filter material 21, and thus reducing the TDS value of the first cup of water in the water filtration system after a long period of shutdown.

[0060] The present invention also provides Example 2, which differs from Example 1 in that the structure of the water storage component is different. In Example 2, the water storage component is an air bag water tank 41 disposed outside the housing 10 and connected to the raw water inlet 11. Specifically, Figure 6 As shown, the airbag water tank 41 includes a water tank shell, a cavity is formed inside the shell, and the cavity has an opening, which is directly fixed to the raw water inlet 11 on the shell 10, so that the raw water can enter the cavity in the water tank shell at the same time when it reaches the raw water inlet 11. At the same time, an elastic film is provided in the cavity, which divides the cavity into a closed air cavity and a water storage cavity connected to the raw water inlet 11. The raw water enters the water storage cavity, and because there is a large pressure at the raw water end when the filter device is running, the elastic film is forced to deform, so that the space of the air cavity becomes smaller, and the air in the air cavity is compressed. When the filter device stops, the pressure at the raw water end disappears, the concentrated water outlet 13 is depressurized, and the pressure on the air in the air cavity is reduced, so it expands to its original volume again. In this process, the raw water in the water storage cavity is squeezed to the bottom end of the filter element, and enters the filter element to rinse the filter material 21.

[0061] The present invention also provides Example 3, which differs from Example 2 in that the water storage component further includes a water storage chamber 42, and the airbag water tank 41 is connected to the water storage chamber 42. Specifically, Figure 7 As shown, the structure of the airbag water tank 41 is the same as that of Example 2, and the structure of the water storage chamber 42 is the same as that of the raw water chamber 40 in Example 1, but the water storage chamber 42 is vacuum. The opening of the airbag water tank 41 is arranged to be connected with the top of the water storage chamber 42. When the filter device is in operation, the raw water enters the water storage chamber 42 after passing through the water inlet pipe 30, and then enters the water storage chamber of the airbag water tank 41, compressing the volume of the air chamber to reduce; when the filter device stops operating, the pressure is unbalanced, and the air chamber returns to its original volume, thereby squeezing the raw water in the water storage chamber and the water storage chamber 42 into the filter element.

[0062] The present invention also provides Example 4, which differs from Example 3 in that air originally exists in the water storage chamber 42. Specifically, based on Example 3, the water storage chamber 42 is filled with air, and the air in the water storage chamber 42 is compressed when water enters, and the space occupied by the air chamber of the airbag water tank 41 is also compressed. When water is discharged, the air in the water storage chamber 42 restores its original volume, and the air in the air chamber also restores its original volume, squeezing the raw water stored in the water storage chamber 42 into the filter element. Compared with Example 3, the amount of raw water entering the filter element in Example 4 is greater.

[0063] The present invention also provides a filtration system, which uses a filtration device of the above-mentioned embodiment 1, embodiment 2, embodiment 3 or embodiment 4. Specifically, the filtration system also includes: a raw water inlet pipeline, which is connected to the raw water inlet 11 and is provided with a solenoid valve and a pressure pump; a pure water outlet pipeline, one end of which is connected to the pure water outlet 12 and the other end is connected to a water outlet faucet; a concentrated water outlet pipeline, which is connected to the concentrated water outlet 13 and is provided with a flushing valve. One end of the above-mentioned raw water inlet pipeline is connected to the municipal tap water, and the other end is connected to the raw water inlet 11. A solenoid valve and a pressure pump are arranged in the middle position. The solenoid valve controls the on-off of the raw water inlet pipeline, and the pressure pump applies pressure to the raw water, so that the raw water enters the filter element with a higher pressure; one end of the pure water outlet pipeline is connected to the pure water outlet 12, and the other end is connected to the water outlet faucet. The opening and closing of the pure water outlet pipeline can be controlled by controlling the water outlet faucet; one end of the concentrated water outlet pipeline is connected to the concentrated water outlet 13, and the other end is connected to the concentrated water tank or directly discharged to the sewer. The flushing valve is used to control the on-off of the concentrated water outlet pipeline.

[0064] The present invention provides a filtering device and a filtering system, in which zero raw water enters the filter element from the bottom of the filter element, and concentrated water is formed after filtration and discharged from the top of the filter element, so that the water flow rate in the filter element is increased and the service life of the filter element is improved; at the same time, a water storage component is provided, and air pressure is used to push the stored raw water into the filter element through the bottom of the filter element for flushing, thereby reducing the TDS value of the water in the filter element in the shutdown state, and further reducing the problem of too high TDS value of the first cup of water caused by osmotic pressure after a long period of shutdown.

[0065] The description of the above specification and embodiments is used to explain the protection scope of the present invention, but does not constitute a limitation on the protection scope of the present invention. Through the enlightenment of the present invention or the above embodiments, ordinary technicians in this field can obtain modifications, equivalent substitutions or other improvements to the embodiments of the present invention or part of the technical features thereof through logical analysis, reasoning or limited experiments, which should be included in the protection scope of the present invention.

Claims

1. A filtering device, comprising a housing, a filter element, a raw water passage, a pure water passage and a concentrated water passage, wherein the raw water passage comprises a raw water inlet provided on the housing, the pure water passage comprises a central tube provided in the filter element and a pure water outlet provided on the housing, and the concentrated water passage comprises a concentrated water outlet provided on the housing, characterized in that: The bottom end of the filter element is connected to the raw water passage for raw water to enter, and the top end of the filter element is connected to the concentrated water passage for concentrated water to discharge; In addition, it includes water storage components; The water storage component is in communication with the raw water passage, and stores raw water when the filter device is running, and uses air pressure to push the stored raw water into the filter element through the bottom of the filter element for flushing when the filter device stops; The water storage component is a raw water cavity formed by the space between the shell and the filter element, which is connected with the bottom end of the filter element and isolated from the top end of the filter element, and the air inside it applies pressure to the raw water entering the raw water cavity.

2. A filtering device according to claim 1, characterized in that: It also includes a water inlet pipe, the top end of which is connected to the raw water inlet and the bottom end is connected to the raw water cavity; the water inlet pipe is sleeved in the central tube, and the pure water generated after filtering by the filter element enters the gap between the central tube and the water inlet pipe and then flows to the pure water outlet.

3. A filtering device according to claim 2, characterized in that: A first limiting protrusion is provided on the inner wall of the central tube near the bottom end, and a second limiting protrusion matching the first limiting protrusion is provided at a corresponding position on the outer wall of the water inlet pipe; the second limiting protrusion is used to press against the first limiting protrusion to fix the water inlet pipe; the first limiting protrusion extends toward the bottom end of the central tube to form a sealing wall, and when the water inlet pipe is fixed to the central tube, the outer wall of the water inlet pipe is sealed with the sealing wall.

4. A filtering device as claimed in claim 3, characterized in that: A protruding first annular portion is provided at the top inner side of the shell, and the top end of the water inlet pipe is sealed with the inward side wall of the first annular portion and is connected to the raw water inlet; a protruding second annular portion is provided at the top inner side of the shell, which is concentric with the first annular portion and located outside the first annular portion, and the top end of the center pipe is sealed with the inward side wall of the second annular portion and is matched with the outward side wall of the first annular portion to form a water path connected to the pure water outlet.

5. A filtering device according to claim 4, characterized in that: It also includes a sealing component; the inner top end of the shell is provided with a third annular portion concentric with the second annular portion and located outside the second annular portion, the sealing component is sealed with the inward side wall of the third annular portion and cooperates with the outward side wall of the second annular portion to form a water path connected to the concentrated water outlet.

6. A filtering device according to claim 5, characterized in that: The sealing member comprises an annular covering plate, both side edges of which extend in vertical directions away from each other to form a first connecting portion and a second connecting portion; the first connecting portion is fixedly connected to the filter element in the circumferential direction, and the second connecting portion is sealingly matched with the inward side wall of the third annular portion and is matched with the outward side wall of the second annular portion to form a water path connected to the concentrated water outlet.

7. A filtering device according to claim 2, characterized in that: A support bar is provided at the bottom inner side of the shell, and the support bar abuts against the filter element to connect the water inlet pipe to the raw water cavity.

8. A filtering device, comprising a housing, a filter element, a raw water passage, a pure water passage and a concentrated water passage, wherein the raw water passage comprises a raw water inlet provided on the housing, the pure water passage comprises a central tube provided in the filter element and a pure water outlet provided on the housing, and the concentrated water passage comprises a concentrated water outlet provided on the housing, characterized in that: The bottom end of the filter element is connected to the raw water passage for raw water to enter, and the top end of the filter element is connected to the concentrated water passage for concentrated water to discharge; In addition, it includes water storage components; The water storage component is in communication with the raw water passage, and stores raw water when the filter device is running, and uses air pressure to push the stored raw water into the filter element through the bottom of the filter element for flushing when the filter device stops; The water storage component includes an air bag water tank located outside the housing and connected to the raw water inlet, which has an air cavity and an elastic film for sealing the air cavity; when the filter device is running, the raw water enters the air bag water tank and squeezes the air in the air cavity through the elastic film to store energy; when the filter device stops, the compressed air expands and squeezes the stored raw water through the elastic film so that it passes through the raw water water passage and reaches the bottom of the filter element; The water storage component also includes a water storage cavity, which is formed by the space between the shell and the filter element, and is communicated with the bottom end of the filter element and isolated from the top end of the filter element.

9. A filtering system, characterized in that: A filter device comprising a filter device as claimed in any one of claims 1 to 8; Additionally, it includes: A raw water inlet pipeline, which is connected to the raw water inlet and is provided with a solenoid valve and a pressure pump; A pure water outlet pipeline, one end of which is connected to the pure water outlet, and the other end of which is connected to the water outlet faucet; The concentrated water outlet pipeline is connected with the concentrated water outlet and is provided with a flushing valve.

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