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 bottom end of the filter element is connected to the raw water water passage for raw water to enter, and the top end thereof is connected to the concentrated water water passage for concentrated water to discharge; in addition, it also comprises a water storage component, which is connected to the pure water water passage, stores pure water when the filtering device is running, and uses air pressure to push the stored pure water into the filter element through a central tube or the bottom end of the filter element for flushing when the filtering device stops working. With the filtering device and filtering system of the above structure, when the filtering device stops working, the water storage component pressurizes the stored pure water to flush the filter element, thereby reducing the ion concentration of the water originally existing in the filter element and reducing the TDS value of the first cup of water.

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. During the penetration process, the concentrated water in the drainage pipe connected to the concentrated water side will flow back into the filter element, further aggravating the penetration of salt ions. 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, which will eventually lead to the first cup of water flowing out of the faucet after the device is turned on again. The TDS value is 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 pure water passage, which stores pure water when the filtering device is running, and uses air pressure to push the stored pure water into the filter element through the central tube or the bottom end of the filter element for flushing when the filtering device stops.

[0007] Based on the first scheme, a second scheme is also provided: the water storage component is a pure water chamber formed by the space between the outer shell and the filter element; the pure water chamber is connected to the central tube and is isolated from the bottom end and the top end of the filter element; the air in the pure water chamber exerts pressure on the pure water entering the pure water chamber.

[0008] Based on the first scheme, a third scheme is also provided: the water storage component includes an air bag water tank located outside the shell and connected to the pure water inlet, which has an air cavity and an elastic film for sealing the air cavity; when the filtering device is running, pure water enters the 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 pure water through the elastic film to enter the filter element.

[0009] Based on the third scheme, a fourth scheme is also provided: the water storage component also includes a water storage chamber, which is formed by the space between the outer shell and the filter element, is connected to the central tube, and is isolated from the bottom end and the top end of the filter element.

[0010] Based on the second or fourth scheme, there is also a fifth scheme: it also includes a valve, which is installed between the pure water chamber and the bottom end of the filter element or the water storage chamber and the bottom end of the filter element, and is turned on when the water pressure on the pure water chamber side or the water storage chamber side is greater than the water pressure on the bottom end side of the filter element.

[0011] On the basis of the fifth scheme, a sixth scheme is also provided: 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 bottom end of the filter element; the water inlet pipe is sleeved in the central tube, and the pure water obtained 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 and the pure water cavity or the water storage cavity.

[0012] Based on the sixth scheme, a seventh scheme is also provided: 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 in a vertical direction 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.

[0013] Based on the sixth scheme, an eighth scheme is also provided: it also includes a first sealing member, which is fixed to the bottom of the filter element to isolate the bottom end of the filter element and the pure water chamber; the central tube passes through the first sealing member to communicate with the pure water chamber, and is sealed with the first sealing member.

[0014] On the basis of the sixth scheme, a ninth scheme is also provided: a protruding first annular portion is provided at the top inner side of the outer 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 with the raw water inlet; a protruding second annular portion is provided at the top inner side of the outer 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 cooperates with the outward side wall of the first annular portion to form a water path connected with the pure water outlet; and also includes a second sealing member, which is fixed to the top of the filter element to isolate the top of the filter element from the pure water cavity; a third annular portion is provided at the top inner side of the outer shell, which is concentric with the second annular portion and located outside the second annular portion, and the second sealing member 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 with the concentrated water outlet.

[0015] Based on the second or fourth scheme, there is also a tenth scheme: a support bar is provided at the bottom inner side of the shell; the support bar presses against the filter element to connect the central tube to the pure water chamber or the water storage chamber.

[0016] The present invention further provides a filtering system, comprising a filtering device according to any one of the first to eleventh embodiments, and further comprising:

[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 pure water when the filter device is running, and to discharge the pure water by air pressure when the filter device stops, so that the pure water enters the water path of the filter device and enters the filter element, thereby flushing the inside of the filter element and reducing the TDS value of the water in the filter element in the shutdown state, thereby 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 pure water water path, 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 pure water cavity, and because it is connected to the central tube, after the raw water is filtered through the filter element to form pure water and enters the central tube, a part of the pure water will enter the pure water cavity from the bottom, squeezing the air originally in the pure water cavity. When the water intake stops, the concentrated water outlet releases pressure, and the air in the pure water cavity pushes the pure water in the cavity into the central tube, and then diffuses to the filter element through the central tube, thereby flushing the filter element, reducing the ion concentration of the water originally in the filter element, and then reducing the TDS value of the first cup of water caused by osmotic pressure.

[0023] 3. The air bag water tank stores pure water and expands when the filtration system is running. When the filtration system stops running, the air in the air cavity returns to its original volume and squeezes the stored pure water through the elastic film. At this time, the pure water can directly enter the filter element through the central tube wall for flushing.

[0024] 4. A water storage chamber is set up. When there is air inside it, it can play the same role as the pure 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 pure water into the filter element for flushing.

[0025] 5. Set a valve to release the pressure at the concentrated water outlet when the filtering device is shut down. The pressure in the pure water chamber or the water storage chamber will be greater than the water pressure at the bottom of the filter element, thereby opening the valve. Part of the pure water in the pure water chamber or the water storage chamber enters the filter element through the central tube, and the other part reduces the ion concentration on the raw water side after passing through the valve, while flushing the filter element. The pressure required to enter the filter element from the water inlet side is smaller than that from the central tube of the filter element. Therefore, under the same pressure conditions, the flushing effect of the filter element can be improved, further reducing the TDS value of the first cup of water.

[0026] 6. A water inlet pipe is provided to guide the raw water to the bottom of the filter element for water inlet. The water inlet pipe is sleeved on the central tube to reduce the volume of the filtering device and make assembly more convenient.

[0027] 7. A first limiting protrusion and a second limiting protrusion are provided to fix the water inlet pipe in the central pipe by the abutment of the two. A sealing wall is provided to isolate the pure water passage from the raw water passage when the water inlet pipe is fixed in the central pipe.

[0028] 8. A first sealing member is provided to seal the bottom end of the filter element and isolate the pure water chamber or the water storage chamber from the bottom end of the filter element; a first annular portion is provided to allow the water inlet pipe to be connected to the water inlet and ensure sealing when the filter device is assembled; a second annular portion is provided to allow the center tube to be connected to the pure water outlet and ensure sealing when the filter device is assembled; a third annular portion is provided to allow the second sealing member to be connected to the concentrated water outlet and ensure sealing when the filter device is assembled; a second sealing member is provided to seal the top end of the filter element and isolate the top end of the filter element from the pure water chamber or the water storage chamber.

[0029] 9. A support bar is provided to form a space for connecting the central tube with the pure water cavity or the water storage cavity between the bottom end of the filter element and the inner bottom end of the shell when the filter element is assembled into the shell.

[0030] 10. A solenoid valve is provided in the filtration system to control the on-off of the raw water inlet pipeline. The second 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 A schematic structural diagram of a second embodiment of a filtering device provided by the present invention;

[0036] Figure 5 for Figure 4 The structural diagram of part B;

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

[0038] Figure 7 A schematic structural diagram of a filtration system provided by the present invention.

[0039] Description of main reference numerals:

[0040] 10. Shell; 11. Raw water inlet; 111. First annular portion; 12. Pure water outlet; 121. Second annular portion; 131. Third annular portion; 13. Concentrated water outlet; 14. Support bar; 21. Filter material; 22. Center tube; 221. First limiting protrusion; 222. Sealing wall; 23. Filter element shell; 30. Valve; 41. Second sealing member; 411. Second covering plate; 421. Third connecting portion; 413. Fourth connecting portion; 42. First sealing member; 421. First covering plate; 422. First connecting portion; 423. Second connecting portion; 50. Water inlet pipe; 51. Second limiting protrusion; 60. Pure water chamber; 61. Water storage chamber; 71. Pressure pump; 72. Pure water outlet pipe; 73. Air bag water tank; 74. Filter bottle. 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 1 A structural schematic diagram of embodiment 1 of a filtering device provided by the present invention is shown, which includes a housing 10, a filter element, a first seal 42, a second seal 41 and a water inlet pipe 50, wherein a pure water chamber 60 is formed between the housing 10 and the filter element, and the pure water chamber 60 here is the water storage component described in the present invention.

[0047] The housing 10 includes a shell and a cover, wherein the cover is the bottom portion of the housing 10, and the housing is the other portion of the housing 10 except the cover. The housing is used to accommodate the filter element, the water inlet pipe 50, the first seal 42 and the second seal 41, and the cover is used to be fixedly connected with the housing to form a complete housing 10. After the filter element, the water inlet pipe 50, the first seal 42 and the second seal 41 are assembled into the housing, the cover is sealed and fixedly connected with the lower end of the housing by welding, screwing, etc. In addition, the overall shape of the housing 10 can be cylindrical, prismatic or other long cylindrical shapes.

[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 groove structures, and a connection structure for connecting and fixing an external pipe is arranged on each of the groove structures. The shape of the annular groove structure formed by 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 it can not match it, and it only needs to provide the function of water inlet and outlet and the function of matching and connecting with the external pipe. 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 raw water under the action of the pressurizing device. The raw water can be municipal tap water.

[0049] like Figure 2As shown, a first annular portion 111, a second annular portion 121 and a third annular portion 131 are provided on the inner top of the housing 10, and the three are arranged as concentric annular protrusion structures. Specifically, the side wall of the first annular portion 111 surrounds a cylindrical groove structure, and its top surface is connected to the raw water inlet 11, the side wall of the second annular portion 121 cooperates with the side wall of the first annular portion 111 to form an annular groove structure, and its top surface is connected to the pure water outlet 12, and the side wall of the third annular portion 131 cooperates with the side wall of the second annular portion 121 to form an annular groove structure, and its top surface is connected to the concentrated water outlet 13. Similarly, the shapes of the first annular portion 111, the second annular portion 121 and the third annular portion 131 may match or not match the overall shape of the housing 10. In particular, the bottom ends of the first annular portion 111, the second annular portion 121 and the third annular portion 131 are located in the same plane.

[0050] The filter element includes a filter material 21, a central tube 22 and a filter element shell 2, 3, wherein the filter material 21 can be a reverse osmosis membrane in combination with a water-blocking net, a screen, etc., which are wound together with the central tube 22 as the center of the circle, and a filter element shell 24 is arranged on the outer wall of the filter material 21 so that only the top and bottom ends thereof can be used for water outlet or water inlet. 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 are arranged on its wall. The pure water formed after the raw water passes through the filter material enters the central tube 22 through the through holes. Figure 2 As shown, the upper end of the central tube 22 is connected to the pure water outlet 12. In the present embodiment, the upper end of the central tube 22 is inserted into the annular groove formed by the cooperation of the first annular portion 111 and the second annular portion 121. The outer wall of the upper end of the central tube 22 matches the inward side wall of the second annular portion 121 in a shape-matching plug-in relationship. A sealing ring is also sleeved on the outer wall of the upper end of the central tube 22 to form a sealing fit with the inward side wall of the second annular portion 121. At the same time, the wall thickness of the central tube 22 is smaller than the width of the annular groove formed by the cooperation of the first annular portion 111 and the second annular portion 121. Therefore, after the central 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 central tube 22 and the outward side wall of the first annular portion 111. At the same time, since the top surface of the annular groove formed by the second annular portion 121 is connected to the pure water outlet 12, the central tube 22 can be connected to the pure water outlet 12.

[0052] The top of the water inlet pipe 50 is connected to the raw water inlet 11, and the bottom is connected to the bottom of the filter element. Specifically, in this embodiment, the water inlet pipe 50 is set to be sleeved in the central tube 22. The gap between the outer wall of the water inlet pipe 50 and the central tube 22 forms a pure water outlet path connected to the pure water outlet 12. The pure water generated by the filter element enters the pure water outlet path and flows to the pure water outlet 12 and the pure water cavity 60. Figure 3 As 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 structure extending upward in the vertical direction, which avoids forming the sealing wall 222 inwardly. A second limiting protrusion 51 is correspondingly provided at a position near the lower end of the water inlet pipe 50. The positions and shapes of the first limiting protrusion 221 and the second limiting protrusion 51 match. When the water inlet pipe 50 is inserted downward into the central tube 22, the second limiting protrusion 51 will abut against the first limiting protrusion 221 at a position near the bottom end of the central tube 22, thereby fixing the water inlet pipe 50. At the same time, a sealing ring is sleeved at a position corresponding to the sealing wall 222 of the water inlet pipe 50, and the size of the water inlet pipe 50 at this position matches the size of the sealing wall 222, so that the raw water is isolated from the pure water.

[0053] like Figure 3 As shown, the bottom end of the water inlet pipe 50 is flush with the bottom end of the filter element, and the bottom end of the center pipe 22 is lower than the bottom end of the filter element and extends into the first sealing member 42. Specifically, a water passage connected to the water inlet pipe 50 is provided on the center pipe 22 between the bottom end of the filter element and the first sealing member 42. The specific shape of the water passage can be regarded as forming an inverted "T" structure together with the vertical waterway in the water inlet pipe 50, and the pure water in the center pipe 22 flows through both sides of the water passage.

[0054] like Figure 2 As shown, the upper end of the water inlet pipe 50 is connected to the raw water inlet 11. In the present embodiment, the upper end of the water inlet pipe 50 is inserted into a cylindrical groove formed by the side wall of the first annular portion 111. The outer wall of the upper end of the center tube 22 matches the shape of the inward side wall of the first annular portion 111 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 50 to form a sealing fit with the inward side wall of the first annular portion 111. Since the top surface of the cylindrical groove formed by the first annular portion 111 is connected to the raw water inlet 11, the water inlet pipe 50 can be connected to the raw water inlet 11.

[0055] The first sealing member 42 is fixedly connected to the bottom of the filter element to isolate the bottom of the filter element from the pure water chamber 60. The central tube 22 passes through the first sealing member 42 to communicate with the pure water chamber 60 and seals with the first sealing member 42. Specifically, in this embodiment, the structure of the first sealing member 42 is as follows: Figure 3As shown, it includes a first coating plate 421 and a first connecting portion 422 and a second connecting portion 423. The shape of the first coating plate 421 is consistent with the cross section of the filter element, and can be a circular ring or a square frame structure, and a hole is formed in the middle for the central tube 22 to pass through. The first coating plate 421 has a side at the hole, and another side is formed at the opposite outer edge. The side of the first connecting portion 422 at the outer edge extends in the upward vertical direction, and then is fixed to the filter element shell 24, so as to form a coating effect on the bottom end face of the filter element, thereby isolating the bottom end of the filter element and the pure water chamber 60. The side of the second connecting portion 423 at the hole extends in the downward vertical direction, and its size matches the central tube 22. The side wall of the central tube 22 at this position is provided with a sealing ring. When the central tube 22 is inserted into the hole on the first sealing member 42, it cooperates with the side wall of the second connecting portion 423 to form a sealed connection to prevent the raw water from mixing with the pure water.

[0056] The second sealing member 41 is fixedly connected to the top of the filter element to isolate the top of the filter element from the pure water chamber 60. Specifically, the structure of the first sealing member 42 is as follows: Figure 2 As shown, it includes a second covering plate 411, a third connecting portion 412 and a fourth connecting portion 413. The shape of the second covering plate 411 is consistent with the cross section of the filter element, and can be a circular ring or a square frame structure, wherein a hole is formed in the middle for the central tube 22 and the water inlet pipe 50 to pass through. The second covering plate 411 has a side at the hole, and another side is formed at the opposite edge. The side of the third connecting portion 412 at the outer edge is formed along the downward vertical direction, and then fixedly connected to the filter element housing 23. The side of the fourth connecting portion 413 at the hole is extended along the upward vertical direction, and then sealed with the third annular portion 131. The fourth connection part 413 is inserted into the annular groove formed by the cooperation of the second annular part 121 and the third annular part 131. The outer wall of the fourth connection part 413 matches the shape of the inward side wall of the third annular part 131 to form a plug-in relationship. A sealing ring is also sleeved on the outer wall of the fourth connection part 413 to form a sealing match with the inward side wall of the third annular part 131, thereby isolating the top of the filter element from the pure water chamber 60. The thickness of the fourth connection part 413 is less than the width of the annular groove formed by the cooperation of the second annular part 121 and the third annular part 131. Therefore, after the fourth connection part 413 is inserted into the annular groove, a gap for water to flow through is formed between the inner side wall of the fourth connection part 413 and the outward side wall of the second annular part 121. At the same time, since the top surface of the annular groove formed by the third annular part 131 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 pure water.

[0057] A support bar 14 is provided at the bottom end of the outer shell 10, and the filter element abuts against the support bar 14 after being installed in the outer shell. Here, the structure abutting against the support bar is the bottom end of the center tube 22, thereby forming a certain space between the bottom end of the center tube 22 and the pure water chamber 60 for pure water to flow into the pure water chamber 60.

[0058] During assembly, first fix the first seal 42 and the second seal 41 to the filter element shell 23, then insert the water inlet pipe 50 into the center tube 22, so that the first limiting protrusion 221 and the second limiting protrusion 51 cooperate to fix the water inlet pipe 50, and then insert the filter element as a whole upward into the shell, so that the water inlet pipe 50, the center tube 22 and the second seal 41 form a plug-in relationship with the first annular portion 111, the second annular portion 121 and the third annular portion 131 on the shell, and then weld the cover body to the shell.

[0059] When in use, the above-mentioned filtering device is assembled into the water filtering system, and after the water inlet pressure device is turned on, tap water flows in from the water inlet pipe 50, and is guided to the space at the bottom of the filter element, and enters the filter material 21 from the bottom of the filter element for filtering. The generated pure water is partially discharged through the pure water outlet 12, and partially stored in the pure water chamber 60 through the lower end of the central tube 22, and the air originally existing in the pure water chamber 60 is squeezed out. When the pressure is balanced, pure water is stored in the pure water chamber 60. When shutting down, the concentrated water outlet 13 is depressurized, and the pure water in the pure water chamber 60 flows back into the filter material 21 through the central tube 22 under the action of air pressure, thereby flushing the filter material 21, so that the TDS of the water in the filter material 21 is reduced.

[0060] In addition, the present invention also provides embodiment 2, and its specific structure is as follows Figure 4 and Figure 5 As shown, the difference from Example 1 is that it further includes a valve 30, which is installed between the pure water chamber 60 and the bottom end of the filter element and opens when the water pressure on the pure water chamber 60 side is greater than the water pressure on the bottom end side of the filter element.

[0061] Specifically, the valve 30 is arranged on the first covering plate 421 of the first seal 42. It is a pressure valve that can be opened and closed by pressure changes on both sides, such as a valve with a piston structure. When the pressure on the bottom side of the filter element is higher, the piston moves downward to block the water path. When the pressure on the side of the pure water chamber 60 is higher, the piston moves upward to open the water path, so that the water stored in the pure water chamber 60 enters the space between the bottom end of the filter element and the first seal 42 to mix with the raw water, thereby reducing the TDS value of the raw water, thereby reducing the TDS value of the first cup of water.

[0062] When the valve 30 is set, the pure water in the pure water chamber 60 can enter the space between the bottom of the filter element and the first sealing member 42 through the valve 30, and then enter the filter element from the water inlet side of the filter element. Since the filter element is a structure formed by convolution of a roll film around a central tube 22, it is easier to enter the filter material 21 of the filter element from the water inlet side of the filter element than to enter the filter material 21 of the filter element from the central tube 22, and the required pressure is lower. Compared with the central tube 22, the valve 30 is equivalent to a pressure relief state, and most of the pure water will pass through the valve 30 and backwash into the filter material 21 to wash away the residual water therein, thereby further reducing the TDS value of the first cup of water.

[0063] In addition, the present invention also provides Example 3, which is different from Example 1 or Example 2 in that: Figure 7 As shown, the pure water outlet 12 is connected to the airbag water tank 73, which is the water storage component. The airbag water tank 73 includes a water tank shell, a cavity is formed inside the shell, and the cavity has an opening, which is connected to the pure water outlet 12 on the shell 10, so that the pure water enters the cavity when it reaches the opening of the airbag water tank 73. 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 pure water outlet 12. Pure water enters the water storage cavity, and because there will be a large pressure at the pure water end when the filter device is running, the elastic film will be forced to deform, so that the space of the air cavity becomes smaller, and the air in the air cavity is compressed. When the filtering device stops, the pressure at the pure 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. Because the outlet of the pure water end is closed, the air bag water tank 73 will squeeze the pure water in the water storage cavity into the central tube 22 during this process, and then enter the pure water cavity 60 or the water storage cavity 61, and flush the filter material 21 in the filter element.

[0064] The present invention also provides Example 4, which differs from Example 3 in that the water storage component further includes a water storage chamber 61, and the airbag water tank 73 is connected to the water storage chamber 61. Specifically, Figure 6 As shown, the structure of the airbag water tank 73 is the same as that of Example 3, and the structure of the water storage chamber 61 is the same as that of the pure water chamber 60 in Example 1 or Example 2, but the interior of the water storage chamber 61 is vacuum. The opening of the airbag water tank 73 is arranged to communicate with the top of the water storage chamber 61. When the filter device is running, pure water enters the water storage chamber 61 through the central tube 22, and then enters the water storage chamber of the airbag water tank 73, compressing the volume of the air chamber to reduce; when the filter device stops running, the pressure is unbalanced, and the air chamber returns to its original volume, thereby squeezing the water storage chamber and the raw water in the water storage chamber 61 into the filter element.

[0065] The present invention also provides Example 5, which differs from Example 4 in that air is stored in the water storage chamber 61. Specifically, based on Example 4, the water storage chamber 61 is filled with air, and the air in the water storage chamber 61 is compressed when water is introduced, and the space occupied by the air chamber of the airbag water tank 73 is also compressed. When water is discharged, the air in the water storage chamber 61 returns to its original volume, and the air in the air chamber also returns to its original volume, squeezing the pure water stored in the water storage chamber 61 into the filter element. Compared with Example 4, the amount of pure water entering the filter element in Example 5 is greater.

[0066] In addition, the present invention also provides an embodiment of a filtration system, which is based on Embodiment 3 and 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 second pressure pump 71; a pure water outlet pipeline, one end of which is connected to the pure water outlet 12 and the other end of which is connected to a water outlet faucet; and a concentrated water outlet pipeline, which is connected to the concentrated water outlet 13 and is provided with a flushing valve.

[0067] Specifically, 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 second pressure pump 71 are arranged in the middle position. The solenoid valve controls the on-off of the raw water inlet pipeline. The second pressure pump 71 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 adjust the water flow rate of the concentrated water outlet pipe.

[0068] In addition, the filtration system can obviously also be based on other embodiments of the filtration device. For example, when based on embodiment 1 or embodiment 2, the filter bottle 74 is the filtration device, and when based on embodiment 3, the filtration device includes the filter bottle 74 and the airbag water tank 73.

[0069] In the above-mentioned embodiment of the filtration system, since the airbag water tank 73 or the water tank is only connected to the pure water outlet pipeline, compared with the structure in the prior art that connects the water storage component with the raw water inlet pipeline, its overall structure is simpler and no additional valves are required for control.

[0070] The present invention provides a filtering device and a filtering system, which are provided with a water storage component. The water storage component is used to store pure water when the filtering device is working. When the filtering device stops working, the water storage component pressurizes the stored pure water to make it enter the filter element, thereby flushing the filter element, reducing the ion concentration of the water originally existing in the filter element, and further reducing the TDS value of the first cup of water caused by osmotic pressure.

[0071] 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 pure water passage, and stores pure water when the filter device is running, and uses air pressure to push the stored pure water into the filter element through the central tube or the bottom of the filter element for flushing when the filter device stops; The water storage component is a pure water cavity formed by the space between the shell and the filter element; the pure water cavity is connected to the central tube and isolated from the bottom end and the top end of the filter element; the air in the pure water cavity exerts pressure on the pure water entering the pure water cavity.

2. A filtering device according to claim 1, characterized in that: It also includes a valve, which is installed between the pure water chamber and the bottom end of the filter element or the water storage chamber and the bottom end of the filter element, and is turned on when the water pressure on the pure water chamber side or the water storage chamber side is greater than the water pressure on the bottom end side of the filter element.

3. A filtering device according to claim 2, 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 bottom end of the filter element; the water inlet pipe is sleeved in the central tube, and the pure water obtained 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 and the pure water cavity or the water storage cavity.

4. A filtering device as claimed in claim 3, 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 in the vertical direction 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.

5. A filtering device as claimed in claim 3, characterized in that: It also includes a first sealing member, which is fixed to the bottom of the filter element to isolate the bottom end of the filter element from the pure water cavity; the central tube passes through the first sealing member to communicate with the pure water cavity and is sealed with the first sealing member.

6. 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 with 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 cooperates with the outward side wall of the first annular portion to form a water path connected with the pure water outlet; it also includes a second sealing member, which is fixed to the top of the filter element to isolate the top end of the filter element from the pure water cavity; a third annular portion is provided at the top inner side of the shell, which is concentric with the second annular portion and located outside the second annular portion, and the second sealing member 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 with the concentrated water outlet.

7. A filtering device according to claim 1, characterized in that: A support bar is provided at the bottom inner side of the shell; the support bar abuts against the filter element so that the central tube is connected to the pure water cavity or the water storage 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 pure water passage, and stores pure water when the filter device is running, and uses air pressure to push the stored pure water into the filter element through the central tube or 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 pure water inlet, which has an air cavity and an elastic film for sealing the air cavity; when the filter device is running, pure 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 pure water through the elastic film to enter 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, is communicated with the central tube, and is isolated from the bottom end and 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.

Images