CN211936398U - A filter device and filter system - Google Patents

Abstract

The utility model discloses a filtering device and a filtering system, wherein the filtering device comprises a casing, a filter element, a raw water passage, a pure water passage and a concentrated water passage. The water passage includes a central pipe arranged in the filter element and a pure water outlet arranged on the outer casing. The concentrated water passage includes a concentrated water outlet arranged on the outer casing. The bottom end of the filter element is communicated with the raw water passage for raw water to enter. The top is communicated with the concentrated water passage for the concentrated water to be discharged; in addition, it also includes a water storage part; the water storage part is communicated with the raw water passage, which stores the raw water when the filtering device is running, and uses air pressure to push the storage when the filtering device stops. The raw water enters the filter element through the bottom of the filter element for flushing. The filter device and filter system with the above structure can effectively reduce the TDS value of the first cup of water and prolong the service life of the filter element by backflushing the filter element through the water storage part.

Description

A filter device and filter system

technical field

The utility model relates to the technical field of filter elements, in particular to a filtering device and a filtering system.

Background technique

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: the water inlet, the pure water outlet and the concentrated water outlet. The core material is wound around the central tube, and the filter element shell is arranged on the outer side wall of the core material, so that the raw water can only enter from one end of the filter element, and the concentrated water can only flow out from the other end of the filter element. Receive pure water. By pressurizing one side of the water inlet, the municipal tap water enters the filter element through the water inlet, and then the tap water is filtered 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 penetrate the reverse osmosis membrane accumulate on the concentrated water side and are discharged through the concentrated water outlet.

When the reverse osmosis water purification device is shut down, the booster pump set on the water inlet side stops working. At this time, part of the 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 the osmotic pressure caused by the difference in ion concentration in the water, the salt ions on the concentrated water side will penetrate to the pure water side. The TDS (Total dissolved solids) value of the inner pure water is high, which eventually leads to the high TDS value of the first glass of water flowing out of the faucet after turning it on again, which is not conducive to human drinking.

Utility model content

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

In order to achieve the above object, the utility model adopts the following technical solutions:

The first technical solution: a filtering device, comprising a casing, a filter element, a raw water passage, a pure water passage and a concentrated water passage, the raw water passage comprises a raw water inlet provided on the casing, and the pure water passage comprises a water passage provided on the filter element. The inner central pipe and the pure water outlet set on the shell, the concentrated water passage includes the concentrated water outlet set on the casing, the bottom end of the filter element is communicated with the raw water passage for raw water to enter, and its top is connected to the concentrated water. The water passage is communicated to discharge concentrated water; in addition, a water storage part is also included; the water storage part is communicated with the raw water passage, which stores the raw water when the filter device is running, and uses air pressure to push the storage when the filter device stops. The raw water enters the filter element through the bottom of the filter element for flushing.

The second technical solution based on the first technical solution: the water storage component is a raw water cavity formed by the space between the casing and the filter element, which is connected with the bottom end of the filter element and isolated from the top of the filter element, and the air inside it enters the raw water. The raw water in the chamber exerts pressure.

The third technical solution based on the first technical solution: the water storage component includes a first air bag water tank located outside the casing and communicated with the raw water inlet, which has an air cavity and an elastic film for sealing the air cavity; a filter device During operation, 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 filter device stops, the compressed air expands and squeezes the stored raw water through the elastic film to make it pass through the raw water passage to the bottom of the filter element. end.

The fourth technical solution based on the third technical solution: the water storage component further includes a water storage cavity, which is formed by the space between the casing and the filter element, which is communicated with the bottom end of the filter element and isolated from the top end of the filter element.

The fifth technical solution based on any one of the second to fourth technical solutions: also includes a water inlet pipe, the top of which is connected with the raw water inlet, and the bottom end is connected with the raw water cavity; the water inlet pipe is sleeved in the center pipe, The pure water produced after being filtered by the filter element enters the gap between the central pipe and the water inlet pipe and flows to the pure water outlet.

The sixth technical solution based on the fifth technical solution: the inner wall of the central pipe is provided with a first limiting protrusion near the bottom end, and the corresponding position on the outer wall of the water inlet pipe is provided with a first limiting protrusion matching the first limiting protrusion. Two limit protrusions; the second limit protrusions are used to abut the first limit protrusions to fix the water inlet pipe; the first limit protrusions extend toward the bottom end of the central pipe to form a sealing wall, When the water inlet pipe is fixed to the central pipe, the outer wall of the water inlet pipe is in sealing fit with the sealing wall.

The seventh technical solution based on the fifth technical solution: the inner top of the casing is provided with a protruding first annular portion, and the top of the water inlet pipe is in sealing fit with the inward side wall of the first annular portion and is in contact with the first annular portion. The raw water inlet is communicated; the inner top end of the casing is provided with a protruding second annular portion that is concentric with the first annular portion and located outside the first annular portion, and the top end of the central pipe faces the second annular portion. The inner side wall is sealed and matched with the outer side wall of the first annular portion to form a water channel communicating with the pure water outlet.

The eighth technical solution based on the seventh technical solution: the inner top end of the housing is provided with a third annular portion concentric with the second annular portion and located outside the second annular portion, the sealing member and the third annular portion The inward-facing sidewall is sealingly matched with the outward-facing sidewall of the second annular portion to form a water channel communicating with the concentrated water outlet.

A ninth technical solution based on the eighth technical solution: further comprising a sealing member; the sealing member comprises an annular cladding plate, and two sides of the cladding plate extend in vertical directions away from each other to form a first a connecting part and a second connecting part; the first connecting part is fixedly connected with the filter element in the circumferential direction; The outer side wall of the annular portion cooperates to form a water channel communicating with the concentrated water outlet.

A tenth technical solution based on the fifth technical solution: the inner bottom end of the casing is provided with a support bar, and the support bar abuts against the filter element so that the water inlet pipe is connected to the original water cavity.

The utility model also provides an eleventh technical solution, which includes a filtering device as described in any one of the first to tenth technical solutions: in addition, it also includes:

a raw water inlet pipeline, which is communicated with 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 is connected to a faucet;

The concentrated water outlet pipeline is communicated with the concentrated water outlet, and is provided with a flushing valve.

As can be seen from the above description of the present utility model, with respect to the prior art, the present utility model has the following beneficial effects:

1. Set up a water storage part to store raw water when the filter device is running, and use air pressure to discharge the raw water when the filter device stops, so that the raw water can still flow when the filter device is stopped, so as to flush the inside of the filter element and reduce the shutdown state. The TDS value of the water in the filter element, thereby reducing the problem that the TDS value of the first cup of water is too high due to osmotic pressure after a long shutdown; in addition, the water storage component is directly connected to the raw water through the water path, which can reduce the number of filter devices. The complexity of the structure is low, and there is no need to add corresponding valves or pipelines, so that the manufacturing cost of the filter device can be reduced.

2. There is air in the raw water cavity, and because it is connected with the bottom end of the filter element, the raw water will enter the raw water cavity from the bottom of the raw water cavity, thereby squeezing the originally existing air. When the filter device stops, the concentrated water outlet will leak. The pressure in the raw water cavity is unbalanced, and the compressed air volume expands, thereby squeezing the raw water occupying the space into the filter element.

3. When the pressure is unbalanced, the airbag water tank can automatically squeeze the stored pure water into the water passage from the raw water, so that the filter element can be washed when the filter device stops.

4. Set up a water storage cavity, which can play the same role as the original water cavity when there is air in it. On this basis, it is also connected with the air bag water tank, which can avoid the air in the water storage cavity after escaping. The drainage capacity is reduced; in addition, if there is no air in the water storage cavity, by connecting it with the air bag water tank, the raw water can be squeezed into the filter element by the function of the air bag water tank for flushing.

5. Set up the water inlet pipe, so that the raw water enters from the bottom of the filter element, which is convenient for the pipeline arrangement in the filter device, and can improve the life of the filter element; .

6. A first limit protrusion is arranged on the inner wall of the central pipe, and a second limit protrusion is arranged on the outer wall of the water inlet pipe, and the position of the water inlet pipe is fixed by pressing against the limit.

7. A first annular portion is provided, which is used to connect the water inlet pipe with the water inlet when the filter device is assembled and ensure the tightness; a second annular portion is provided, which is used for the central pipe to communicate with the pure water outlet when the filter device is assembled and ensure sealing. A third annular portion is provided, so that the sealing member can communicate with the concentrated water outlet and ensure the tightness when the filter device is assembled.

8. The first connecting part of the sealing element is fixedly connected with the filter element shell in the circumferential direction, and together with the cladding plate, it realizes the surrounding of the top end face of the filter element, and then through the sealing cooperation between the second connecting part and the third annular part, the concentration of the filter element is reduced. The water outlet is isolated from the original water cavity, so that the concentrated water can only flow out from the concentrated water outlet.

9. A support bar is provided to form a space between the bottom end of the filter element and the bottom end of the inner side of the casing for the connection between the water inlet pipe and the original water cavity when the filter element is assembled into the casing.

10. A solenoid valve is set in the filtration system to control the opening and closing of the raw water inlet pipeline, the pressure pump is used to pressurize the raw water so that the raw water enters the filter element for filtration, and the outlet faucet is used to control the opening and closing of the pure water outlet pipeline and the water outlet. The flush valve is used to adjust the water flow of the concentrated water outlet pipeline.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a schematic structural diagram of Embodiment 1 of a filtering device provided by the present invention;

Fig. 2 is the structural representation of part A in Fig. 1;

Fig. 3 is the structural representation of part B in Fig. 1;

Fig. 4 is the structural representation of filter element, water inlet pipe and seal in Fig. 1;

Fig. 5 is the structural representation of the casing in Fig. 1;

6 is a schematic structural diagram of Embodiment 2 of a filtering device provided by the present invention;

FIG. 7 is a schematic structural diagram of Embodiment 3 of a filtering device provided by the present invention.

Description of main reference signs:

10. Shell; 11. Raw water inlet; 12. Pure water outlet; 13. Concentrated water outlet; 14. Support strip; 15. First annular part; 16. Second annular part; 17. Third annular part; 21, filter material; 22, central pipe; 221, first limit protrusion; 2211, sealing wall; 222, through hole; 23, seal; 231, cladding plate; 232, first connection part; 233, first Two connecting parts; 24, filter element shell; 30, water inlet pipe; 31, second limit protrusion; 40, original water cavity; 41, air bag water tank; 42, water storage cavity.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are preferred embodiments of the invention and should not be considered as exclusions of other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In the claims, description and the above drawings of the present utility model, unless otherwise expressly defined, the terms "first", "second" or "third" are used to distinguish different objects, rather than using the terms "first", "second" or "third". to describe a specific order.

In the claims, description and the above drawings of the present utility model, unless otherwise expressly defined, the terms "center", "horizontal", "longitudinal", "horizontal", "vertical", "top ", "bottom", "inside", "outside", "up", "down", "front", "rear", "left", "right", "clockwise", "counterclockwise", etc. Or the positional relationship is based on the orientation and positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation or be constructed in a specific orientation. and operation, so it should not be construed as limiting the specific protection scope of the present invention.

In the claims, description and the above drawings of the present utility model, unless otherwise clearly defined, the terms "fixed connection" or "fixed connection" should be used in a broad sense, that is, there is no displacement relationship and relative rotation between the two. Any connection of the relationship, that is to say including non-removably fixed connection, detachable fixed connection, integral and fixed connection by other means or elements.

In the claims, description and the above-mentioned drawings of the present invention, if the terms "including", "having" and their modifications are used, it is intended to mean "including but not limited to".

Referring to FIG. 1 , FIG. 1 shows a schematic structural diagram of Embodiment 1 of a filtering device provided by the present invention, which includes a housing 10 , a filter element, a sealing member 23 and a water inlet pipe 30 .

The casing 10 includes a casing and a cover. As shown in FIG. 5 , the cover is the bottom part of the casing 10 , and the casing is the other part of the casing 10 except for the cover. The casing is used to accommodate the filter element, the water inlet pipe 30 and the seal. Part 23, the cover is used to be fastened to the housing to form a complete housing 10. After the filter element, the sealing member 23 and the water inlet pipe 30 are assembled into the casing, the cover body is sealed and fixed to the lower end of the casing by welding, screwing or the like. In addition, the whole of the housing 10 may be cylindrical, but may be prismatic.

The upper end of the casing 10 is provided with a raw water inlet 11, a pure water outlet 12 and a concentrated water outlet 13, and the three are arranged as concentric annular through-groove structures. Of course, the shape of the raw water inlet 11, the pure water outlet 12 and the concentrated water outlet 13 can be matched with the overall shape of the casing 10 to form a circular or square shape, and can also match the overall shape of the casing 10. Not matching, just provide the water inlet and outlet functions and the function of matching with external devices. As shown in FIG. 1 , a raw water inlet 11 is located at the center, a pure water outlet 12 is formed outward from the raw water inlet 11 , and a concentrated water outlet 13 is formed outward from the pure water outlet 12 . The raw water inlet 11 is communicated with 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.

A first annular portion 15 , a second annular portion 16 and a third annular portion 17 are provided at the inner top end of the housing 10 , and the three are arranged as concentric annular convex structures, and as shown in FIG. 1 , the first annular portion The side wall of 15 is surrounded to form a cylindrical groove structure, the top surface of which is communicated with the raw water inlet 11, and 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 of which is The surface communicates with the pure water outlet 12 , 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, and its top surface communicates with the concentrated water outlet 13 . Likewise, the shapes of the first annular portion 15 , the second annular portion 16 and the third annular portion 17 may or may not match the overall shape of the housing 10 . In particular, the planes where the bottom ends of the first annular portion 15 , the second annular portion 16 and the third annular portion 17 are located are the same.

As shown in FIG. 4 , the filter element includes a filter material 21, a central pipe 22 and a filter element shell 24, wherein the filter material 21 can be formed by cooperating with a reverse osmosis membrane, a water barrier, a screen, etc. with the central pipe 22 as the center of the circle. The outer side wall of the filter material 21 is provided with a filter element shell 24 so that only the top and bottom ends of the filter material are exposed. In addition, the filter material 21 may also be a material that can filter metal ions in water, such as a nanofiltration membrane.

The center pipe 22 is arranged in the center of the filter material 21 , and the pipe wall is provided with a plurality of through holes 222 , and pure water formed after the incoming water passes through the filter material enters the center pipe 22 through the through holes 222 . As shown in FIG. 2 , the upper end of the central pipe 22 is communicated with the pure water outlet 12 . In this embodiment, the upper end of the central pipe 22 is inserted into the ring formed by the cooperation of the first annular portion 15 and the second annular portion 16 . In the groove, the outer side wall of the upper end of the central pipe 22 is matched with the shape of the inward side wall of the second annular portion 16 to form a plug-in relationship, and a sealing ring is also sleeved on the outer side wall of the upper end of the central pipe 22 , so as to form a sealing fit with the inward side wall of the second annular portion 16, and the thickness of the tube wall of the central 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, in the central tube After the 22 is inserted into the annular groove, a gap for water to flow through is formed between the inner side wall of the central pipe 22 and the outward-facing side wall of the first annular portion 15, and at the same time, due to the top of the annular groove formed by the second annular portion 16. The surface is communicated with the pure water outlet 12 , so the central pipe 22 can be communicated with the pure water outlet 12 .

The water inlet pipe 30 communicates with the raw water inlet 11 and can guide the inlet water from the raw water inlet 11 to below the bottom end of the filter element. Specifically, in this embodiment, as shown in FIG. 4 , the water inlet pipe 30 is set to be sleeved and fixed in the central pipe 22 , and the gap formed by the outer wall of the water inlet pipe 30 and the inner wall of the central pipe 22 is formed with the pure water outlet. The pure water outlet channel connected with the nozzle 12. As shown in FIG. 3 , a first limiting protrusion 221 is provided on the inner wall of the central tube 22 near the lower end. The first limiting protrusion 221 is an annular shape formed by the inner wall of the central tube 22 extending inward. It also includes a sealing wall 2211 extending downward from the extended free end, and an annular second limiting protrusion 31 is provided at the position near the lower end of the water inlet pipe 30. The size of the limiting protrusion 31 can be matched with 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 abut against the first limiting protrusion 221. The upper edge of the limiting protrusion 221 is fixed to fix the water inlet pipe 30 . At the same time, a sealing ring is sleeved at the position where the water inlet pipe 30 is inserted into the sealing wall 2211, and the size of the water inlet pipe 30 at this position is matched with the size of the sealing structure, so that the pure water outlet waterway forms a closed structure here, and the inlet The inlet water of the water pipe 30 can flow to the bottom end of the filter element.

In addition, a through hole 222 may or may not be provided on the wall of the central pipe 22 below the water inlet pipe 30 . When the through hole 222 is provided, part of the pure water will be mixed with the inlet water, further reducing the impact of the water flushing the filter material 21 . TDS value.

As shown in FIG. 2 , the upper end of the water inlet pipe 30 is communicated with the raw water inlet 11 . In this embodiment, the upper end of the water inlet pipe 30 is inserted into the cylindrical groove surrounded by the side wall of the first annular portion 15 . Among them, the outer side wall of the upper end of the central pipe 30 is matched with the shape of the inward side wall of the first annular portion 15 to form a plug-connection relationship, and the outer side wall of the upper end of the water inlet pipe 30 is also sleeved with a sealing ring to be connected with The inward sidewall of the first annular portion 15 forms a sealing fit. Since the top surface of the cylindrical groove formed by the first annular portion 15 communicates with the raw water inlet 11 , the water inlet pipe 30 can communicate with the raw water inlet 11 .

The structure of the sealing member 23 is shown in FIG. 4 , which includes a cladding plate 231 and a first connecting portion 232 and a second connecting portion 233 . Specifically, the shape of the cladding plate 231 is consistent with the cross section of the filter element, and can be a ring or a box structure, and a hole is formed in the middle for the central pipe 22 and the water inlet pipe 30 to pass through. The cladding plate 231 has one side at the hole position, and the other side is formed at the outer edge. The first connecting portion 232 extends along the side of the outer edge in a downward vertical direction, and is then fixed to the filter element shell 24 . connected to form a coating effect on the top end face of the filter element. The second connecting portion 233 is formed to extend along the side edge of the hole in an upward vertical direction, and then is sealingly matched with the third annular portion 17 . Specifically, as shown in FIG. 2 , the second connecting portion 233 is inserted into the annular groove formed by the cooperation of the second annular portion 16 and the third annular portion, and the outer side wall of the second connecting portion 233 and the third annular portion 17 The shape of the inward-facing sidewall of the second connecting portion 233 is matched to form a plug-in relationship, and a sealing ring is also sleeved on the outer sidewall of the second connecting portion 233 to form a sealing fit with the inward-facing sidewall of the third annular portion 17, while the second connection The thickness of the portion 233 is smaller than the width of the annular groove formed by the cooperation of the second annular portion 16 and the third annular portion 17. Therefore, after the second connecting portion 233 is inserted into the annular groove, the inner sidewall of the second connecting portion 233 and the second connecting portion 233 A space for water to flow through is formed between the outward-facing side walls of the annular portion 16, and 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 face of the filter element does not need to be connected to the inlet. The mixed water is communicated with the concentrated water outlet 13 .

As shown in FIG. 5 , a support bar 14 is provided at the bottom end of the housing 10, and the bottom end of the filter element is in contact with the support bar 14, thereby forming a space between the end face of the filter element bottom and the shell bottom of the housing 10, so that the water inlet pipe 30 can communicate with the bottom of the filter element end face, so that the incoming water can enter the filter material 21 through the end face of the bottom of the filter element.

The filter device further includes a water storage part, which stores the raw water when the filter device works, and presses the stored raw water to enter the filter element when the filter device stops working. Specifically, in this embodiment, a raw water cavity 40 is formed between the inner side wall of the housing 10 and the filter element shell 24 of the filter element, and the original water cavity 40 communicates with 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 originally existing air to compress the air and pressurize the raw water in the raw water chamber 40. When water enters, the air pressure in the raw water cavity 40 will push the raw water into the filter element.

When assembling, firstly fix the first connecting part 232 of the seal 23 with the filter element shell 24 on the upper part of the filter element, then insert the water inlet pipe 30 into the central pipe 22 to make it abut against the limiting part 221, and then place the entire filter element toward the center pipe 22. It is inserted into the casing, so that the water inlet pipe 30, the central pipe 22 and the sealing member 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 casing, and then the The cover body and the shell are welded.

When in use, the filter device is assembled into the water filtration system, and the tap water flows in from the water inlet pipe 30 after the water inlet pressure device is turned on, and is guided into the space at the bottom end of the filter element. At this time, part of the tap water flows from the bottom to the top of the filter element. Entering the filter material 21 to filter water, part of the tap water enters the raw water cavity 40 between the casing 10 and the filter element shell 24, and squeezes the air originally existing in the raw water cavity 40. When the pressure is balanced, the air is no longer After being squeezed, tap water is stored in the raw water cavity 40 at this time. During shutdown, 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, so that the filter material The TDS value of the water within 21 decreases, thereby reducing the TDS value of the first glass of water after the water filtration system has been shut down for a long time.

The present invention also provides Embodiment 2, which is different from Embodiment 1 in that the structure of the water storage part is different. In Embodiment 2, the water storage part is an air bag water tank which is arranged outside the casing 10 and communicated with the raw water inlet 11 . 41. Specifically, as shown in FIG. 6, the air bag water tank 41 includes a water tank shell, and a cavity is formed inside the shell, and the cavity has an opening, and the opening is directly fixed to the raw water inlet 11 on the outer shell 10, When the raw water reaches the raw water inlet 11, it can enter the cavity in the water tank shell at the same time, and at the same time, an elastic film is arranged in the cavity, and the elastic film divides the cavity into a closed air cavity and a cavity. A water storage chamber communicated with the raw water inlet 11, the raw water enters the water storage chamber, and due to the large pressure at the raw water end during the operation of the filter device, the elastic film will be forced to deform, so that the space of the air chamber becomes smaller, 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 releases the pressure, and the pressure on the air in the air chamber decreases, so it re-expands to its original volume. Squeeze to the bottom end of the filter element, and enter into the filter element to flush the filter material 21 .

The present invention also provides Embodiment 3, which is different from Embodiment 2 in that the water storage component further includes a water storage cavity 42 , and the air bag water tank 41 communicates with the water storage cavity 42 . Specifically, as shown in FIG. 7 , the structure of the airbag water tank 41 is the same as that of the second embodiment, and the structure of the water storage chamber 42 is the same as that of the original water chamber 40 in the first embodiment, but the water storage chamber 42 is a vacuum. The opening of the air bag water tank 41 is set to communicate with the top of the water storage chamber 42. When the filter device is running, 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 air bag water tank 41 to compress the air. The volume of the cavity is reduced; when the filter device stops running, the pressure is unbalanced, and the air cavity restores its original volume, thereby squeezing the raw water in the water storage cavity and the water storage cavity 42 into the filter element.

The present invention also provides Embodiment 4, which differs from Embodiment 3 in that air originally exists in the water storage cavity 42 . Specifically, on the basis of Embodiment 3, the water storage cavity 42 is filled with air, and the air in the water storage cavity 42 is compressed when the water enters, and the space occupied by the air cavity of the air bag water tank 41 is also compressed. The air in the water cavity 42 restores its original volume, and the air in the air cavity also restores its original volume, and the raw water stored in the water storage cavity 42 is squeezed into the filter element. Compared with Example 3, the amount of raw water entering the filter element in Example 4 is more.

The present invention also provides a filtering system, which uses the filtering device of the above-mentioned Embodiment 1, Embodiment 2, Embodiment 3 or Embodiment 4. Specifically, the filtering system further includes: a raw water inlet pipeline , which is communicated with the raw water inlet 11, on which a solenoid valve and a pressure pump are arranged; the pure water outlet pipeline, one end of which is communicated with the described pure water outlet 12, and the other end is communicated with the outlet faucet; the concentrated water outlet The water pipeline is communicated with the concentrated water outlet 13, and is provided with a flush valve. One end of the above-mentioned raw water inlet pipeline is communicated with municipal tap water, and the other end is communicated with 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 large pressure; one end of the pure water outlet pipe is connected with the pure water outlet 12, and the other end is connected with the outlet faucet, and the opening and closing of the pure water outlet pipe can be controlled by controlling the outlet faucet; One end of the 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 pipe. The flush valve is used to control the on-off of the concentrated water outlet pipeline.

In the filtering device and filtering system provided by the utility model, zero raw water enters the filter element from the bottom end of the filter element, and concentrated water formed after filtration is discharged from the top of the filter element, so that the flow velocity of the water flow in the filter element can be increased, and the service life of the filter element can be improved; The water storage part uses air pressure to push the stored raw water into the filter element through the bottom end of the filter element for flushing, thereby reducing the TDS value of the water in the filter element in the shutdown state, thereby reducing the first cup caused by osmotic pressure after a long shutdown. The problem that the TDS value of water is too high.

The descriptions of the above specification and embodiments are used to explain the protection scope of the present invention, but do not constitute a limitation to the protection scope of the present invention. Through the enlightenment of the present invention or the above-mentioned embodiments, those of ordinary skill in the art can obtain an understanding of the present invention through logical analysis, reasoning or limited experiments in combination with common knowledge, common technical knowledge in the field and/or prior art. Modifications, equivalent replacements or other improvements of the embodiments or a part of the technical features thereof should all be included within the protection scope of the present invention.

Claims (11)

1. A filter device, comprising a casing, a filter element, a raw water passage, a pure water passage and a concentrated water passage, the raw water passage comprises a raw water inlet provided on the casing, and the pure water passage comprises a center located in the filter element. The pipe and the pure water outlet arranged on the shell, and the concentrated water passage includes the concentrated water outlet arranged on the outer shell, and it is characterized in that, The bottom end of the filter element is communicated with the raw water passage for the entry of raw water, and the top of the filter element is communicated with the concentrated water passage for the concentrated water to be discharged; In addition, water storage components are included; The water storage component communicates with the raw water passage, stores raw water when the filter device is running, and uses air pressure to push the stored raw water through the bottom end of the filter element into the filter element for flushing when the filter device stops. 2. A filter device according to claim 1, wherein the water storage component is a raw water cavity formed by the space between the casing and the filter element, which is communicated with the bottom end of the filter element and isolated from the top of the filter element, and The air inside it exerts pressure on the raw water entering the raw water chamber. 3. A filter device according to claim 1, characterized in that, the water storage part comprises an air bag water tank located outside the casing and communicated with the raw water inlet, which has an air cavity and a water tank for sealing the air cavity. Elastic film; when the filter device is running, the raw water enters the airbag 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 to pass the raw water through the waterway. to the bottom of the filter element. 4. The filter device according to claim 3, wherein the water storage component further comprises a water storage cavity, which is formed by the space between the casing and the filter element, and is connected to the bottom end of the filter element. Connected and isolated from the top of the filter element. 5. A filter device according to any one of claims 2-4, characterized in that, further comprising a water inlet pipe, the top end of which is communicated with the raw water inlet, and the bottom end is communicated with the raw water cavity; the water inlet pipe is sleeved In the central pipe, the pure water produced by the filter element enters the gap between the central pipe and the water inlet pipe and flows to the pure water outlet. 6 . The filter device according to claim 5 , wherein the inner wall of the central pipe is provided with a first limiting protrusion at a position close to the bottom end, and a corresponding position on the outer wall of the water inlet pipe is provided with a first limiting protrusion. 7 . a second limit protrusion matched with the limit protrusion; the second limit protrusion is used to abut the first limit protrusion to fix the water inlet pipe; the first limit protrusion faces the central pipe The bottom end extends to form a sealing wall, and when the water inlet pipe is fixed on the central pipe, the outer wall of the water inlet pipe is in sealing fit with the sealing wall. 7 . The filter device according to claim 5 , wherein the top end of the inner side of the casing is provided with a protruding first annular portion, and the top end of the water inlet pipe and the inward facing portion of the first annular portion are provided. 8 . The side wall is sealingly matched and communicated with the raw water inlet; the inner top of the casing is provided with a second protruding annular portion concentric with the first annular portion and located outside the first annular portion, and the top end of the central pipe is connected to the first annular portion. The inward-facing sidewall of the second annular portion is sealingly matched with the outward-facing sidewall of the first annular portion to form a water channel communicating with the pure water outlet. 8 . The filter device according to claim 7 , further comprising a sealing member; the inner top end of the casing is provided with a third annular portion that is concentric with the second annular portion and located outside the second annular portion. 9 . and the sealing member is in sealing cooperation with the inward-facing sidewall of the third annular portion and cooperates with the outward-facing sidewall of the second annular portion to form a water channel communicating with the concentrated water outlet. 9 . The filter device according to claim 8 , wherein the sealing member comprises an annular cladding plate, and two sides of the cladding plate are respectively formed by extending in vertical directions away from each other. 10 . a first connecting part and a second connecting part; the first connecting part is fixedly connected with the filter element in the circumferential direction; The outward-facing side wall of the second annular portion cooperates to form a water channel communicating with the concentrated water outlet. 10 . The filter device according to claim 5 , wherein the bottom end of the inner side of the casing is provided with a support bar, and the support bar abuts against the filter element so that the water inlet pipe is connected to the original water cavity. 11 . 11. A filtering system, characterized in that, comprising a filtering device as claimed in any one of claims 1-10; In addition, it includes: a raw water inlet pipeline, which is communicated with 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 is connected to a faucet; The concentrated water outlet pipeline is communicated with the concentrated water outlet, and is provided with a flushing valve.

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