Environment-friendly water-saving backwashing type filtering device

Abstract

The utility model relates to an environment-friendly water-saving backwashing type filtering device which comprises a water inlet pipe, a hydraulic pipe, a water outlet pipe and a filtering cavity, a first-stage filtering core and a second-stage filtering core are arranged in the filtering cavity, a filter pipe is arranged at the bottom of the filtering cavity, the hydraulic pipe is sleeved with the filter pipe, and the hydraulic pipe is rotationally connected with the filter pipe. The water inlet pipe and the water outlet pipe are respectively fixed at two ends of the filter pipe and are communicated with the hydraulic pipe; a filter water inlet, a filter water outlet, a backwash water inlet and a backwash water outlet are formed in the top of the filter pipe and are all located in the filter cavity, the filter water inlet and the backwash water outlet are located on the two sides of the secondary filter element and the primary filter element respectively, and the filter water outlet and the backwash water inlet are both located in the bottom of the secondary filter element; compared with the prior art, the self-backwashing of a single filtering device can be realized, multiple groups of filtering devices are not required to be connected in parallel, other peripherals are not required, the manufacturing cost is low, the applicability is high, and the installation and the operation are simple.

Description

[TECHNICAL FIELD]

[0001] The utility model belongs to the field of environmental protection and water saving technology, specifically an environmental protection and water saving backwash type filter device. [BACKGROUND] In recent years, modern environmental protection and water saving technology has been rapidly popularized and popularized, and filter equipment is an important part of modern water saving and environmental protection, which is responsible for filtering and treating water sources, removing impurities and protecting the end pipe network from being blocked.

[0003] Common automatic cleaning type filter often needs multiple groups of parallel connection and the help of special backwash valve body, control solenoid valve and special controller to realize, and the cost is very high, and the control waterway is easy to be blocked, and the reliability is not high.

[0004] Therefore, it is necessary to design a convenient and practical environmental protection and water saving backwash type filter device. [SUMMARY]

[0005] The utility model discloses a kind of environmental protection and water saving backwash type filter devices, which can realize self backwash of single filter device, without multiple groups of parallel connection, without other peripherals, with low cost, strong applicability, and installation, operation is simple.

[0006] To achieve the above objectives, an environmentally friendly and water-saving backwashing filtration device is designed, comprising an inlet pipe 1, a hydraulic pipe 2, an outlet pipe 9, and a filter chamber 20. The filter chamber 20 contains a primary filter element 18 and a secondary filter element 19, with the secondary filter element 19 located inside the primary filter element 18. A filter chamber cover 21 is installed on the top of the filter chamber 20. A filter tube 14 is located at the bottom of the filter chamber 20, sleeved on the outside of the hydraulic pipe 2. The hydraulic pipe 2 and the filter tube 14 are rotatably connected. The inlet pipe 1 and the outlet pipe 9 are respectively fixed to both ends of the filter tube 14, and both are connected to the hydraulic pipe 2. A filter inlet 1 is located at the top of the filter tube 14. 3. Filter outlet 15, backwash inlet 16, and backwash outlet 12. The filter inlet 13, filter outlet 15, backwash inlet 16, and backwash outlet 12 are all located inside the filter chamber 20. The filter inlet 13 and backwash outlet 12 are located on both sides of the secondary filter element 19 and the primary filter element 18, respectively. The filter outlet 15 and backwash inlet 16 are both located at the bottom of the secondary filter element 19. The filter outlet 15 is located inside the outlet pipe 9. The inlet end of the filter outlet 15 is connected to the hydraulic pipe 2. The outlet end of the filter outlet 15 is connected to the secondary filter element 19 and is connected to the outlet pipe 9. The filter inlet 13 is connected to the inlet pipe 1.

[0007] Furthermore, the hydraulic pipe 2 is provided with a reversible backwash valve 11, the backwash valve 11 is provided with a flange connection 10, and the bottom of the backwash valve 11 is fixedly connected to the hydraulic pipe 2 through the flange connection 10.

[0008] Furthermore, the opening angle on the cylindrical surface of the filter tube 14 is 90°, and the backwash valve 11 drives the hydraulic tube 2 to rotate within a range of 0-90° under the action of external force, and realizes water circuit switching through the rotation of the hydraulic tube 2, and realizes backwashing by changing the direction of internal and external water flow.

[0009] Furthermore, the hydraulic pipe 2 is provided with a filter outlet 15 and a backwash inlet 16 that are respectively connected to the primary filter element 18 and the secondary filter element 19, and the center line of the filter outlet 15 is perpendicular to the center line of the backwash inlet 16.

[0010] Furthermore, one end of the hydraulic pipe 2 is closed, and the other end of the hydraulic pipe 2 is connected to the inlet pipe 1. A sealing plate 3 is provided inside the hydraulic pipe 2, and the sealing plate 3 divides the hydraulic pipe 2 into a backwash drain cylinder 4, a backwash inlet cylinder 6, a filter drain hole 22, and a filter inlet 13. The filter inlet 13 is connected to the inlet pipe 1. The filter drain hole 22 is located between the backwash drain cylinder 4 and the filter inlet 13. The backwash inlet cylinder 6 is located between the backwash drain cylinder 4 and the filter drain hole 22.

[0011] Furthermore, it also includes a filter outlet 17 and a filter inlet 23. The backwash inlet 16 is connected to the filter inlet 13 through the filter outlet 17, and the filter drain hole 22 is connected to the filter outlet 15 through the filter inlet 23.

[0012] Furthermore, a backwashing guide pipe 7 is also provided inside the hydraulic pipe 2. The backwashing guide pipe 7 is fixed outside the filter pipe 14. One end of the backwashing guide pipe 7 is connected to the filter outlet 15, and the other end of the backwashing guide pipe 7 is connected to the inlet end of the filter inlet 23.

[0013] Furthermore, the hydraulic pipe 2 is installed on the device bracket 8, and a drain outlet 5 is provided at the bottom of the hydraulic pipe 2. The drain outlet 5 is connected to the backwash drain cylinder 4. The backwash wastewater enters the backwash drain cylinder 4 through the backwash outlet 12 and the second backwash inlet 16, and then enters the drain outlet 5 for discharge.

[0014] Furthermore, a backwashing port unit is also provided, which includes a first backwashing outlet, a first backwashing inlet, a second backwashing outlet, a second backwashing inlet, and a third backwashing outlet. A backwashing guide pipe 7 is provided at the bottom of the filter tube 14. One end of the backwashing guide pipe 7 is connected to the first backwashing outlet, and the other end of the backwashing guide pipe 7 is connected to the first backwashing inlet. The filter inlet 13 is connected to the backwashing inlet cylinder 6 through the backwashing guide pipe 7. The backwashing inlet cylinder 6 is connected to the second backwashing inlet through the second backwashing outlet. The backwashing drain cylinder 4 is connected to the second backwashing outlet through the second backwashing inlet. A drain pipe is also provided at the bottom of the filter tube 14, and the drain pipe is connected to the backwashing drain cylinder 4 through the third backwashing outlet.

[0015] Furthermore, the primary filter element 18, the secondary filter element 19, and the filter outlet 15 have the same filtration accuracy level. The primary filter element 18 and the secondary filter element 19 are the filter media under normal working conditions. The filter outlet 15 filters a small amount of water that has not been filtered by the primary filter element 18 and the secondary filter element 19 during the switching between filtration and backwashing working conditions.

[0016] Compared with the prior art, this utility model has the following advantages:

[0017] (1) This utility model achieves water circuit switching by rotating the hydraulic tube and achieves backwashing by changing the direction of internal and external water flow. The first-stage filter element and the second-stage filter element are cleaned quickly and thoroughly.

[0018] (2) All joints and holes of this utility model are provided with sealing rings or sealing gaskets to prevent water leakage.

[0019] (3) This utility model can realize self-backwashing of individual filters without the need for multiple parallel connections or other external devices. It has low cost, strong applicability, simple installation and operation, and is easy to promote. [Image Description]

[0020] Figure 1 This is a schematic diagram of the external structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of this utility model. Figure One ;

[0022] Figure 3 This is a schematic diagram of the structure of this utility model. Figure Two ;

[0023] In the diagram: 1. Inlet pipe; 2. Hydraulic pipe; 3. Sealing plate; 4. Backwash drain tank; 5. Drain outlet; 6. Backwash inlet tank; 7. Backwash drain pipe; 8. Device support; 9. Outlet pipe; 10. Flange connection; 11. Backwash valve; 12. Backwash outlet; 13. Filter inlet; 14. Filter pipe; 15. Filter outlet; 16. Backwash inlet; 17. Filter outlet hole; 18. Primary filter element; 19. Secondary filter element; 20. Filter chamber; 21. Filter chamber cover; 22. Filter drain hole; 23. Filter inlet. [Detailed Implementation]

[0024] As attached Figure 1 To be continued Figure 3As shown, this utility model provides an environmentally friendly and water-saving backwashing filtration device, including an inlet pipe 1, a hydraulic pipe 2, an outlet pipe 9, and a filter chamber 20. The filter chamber 20 contains a primary filter element 18 and a secondary filter element 19, with the secondary filter element 19 located inside the primary filter element 18. A filter chamber cover 21 is installed on the top of the filter chamber 20. A filter tube 14 is located at the bottom of the filter chamber 20, sleeved on the outside of the hydraulic pipe 2. The hydraulic pipe 2 and the filter tube 14 are rotatably connected. The inlet pipe 1 and the outlet pipe 9 are respectively fixed to both ends of the filter tube 14, and both are connected to the hydraulic pipe 2. A filter inlet 13 is located at the top of the filter tube 14. The filter outlet 15, backwash inlet 16, and backwash outlet 12, as well as the filter inlet 13, filter outlet 15, backwash inlet 16, and backwash outlet 12, are all located inside the filter chamber 20. The filter inlet 13 and backwash outlet 12 are located on both sides of the secondary filter element 19 and the primary filter element 18, respectively. The filter outlet 15 and backwash inlet 16 are both located at the bottom of the secondary filter element 19. The filter outlet 15 is located inside the outlet pipe 9. The inlet end of the filter outlet 15 is connected to the hydraulic pipe 2. The outlet end of the filter outlet 15 is connected to the secondary filter element 19 and is connected to the outlet pipe 9. The filter inlet 13 is connected to the inlet pipe 1.

[0025] The hydraulic pipe 2 is equipped with a reversible backwash valve 11, which has a flange connection 10. The bottom of the backwash valve 11 is fixedly connected to the hydraulic pipe 2 via the flange connection 10. The filter pipe 14 has a 90° opening on its cylindrical surface. Under external force, the backwash valve 11 drives the hydraulic pipe 2 to rotate within a range of 0-90°, and the rotation of the hydraulic pipe 2 achieves water path switching and backwashing by changing the direction of internal and external water flow. The hydraulic pipe 2 is equipped with a filter outlet 15 and a backwash inlet 16, which are respectively connected to the primary filter element 18 and the secondary filter element 19. The centerline of the filter outlet 15 is perpendicular to the centerline of the backwash inlet 16. One end of the hydraulic pipe 2 is closed, and the other end of the hydraulic pipe 2 is connected to the inlet pipe 1. A sealing plate 3 is provided inside the hydraulic pipe 2. The sealing plate 3 divides the hydraulic pipe 2 into a backwash drain cylinder 4, a backwash inlet cylinder 6, a filter drain hole 22, and a filter inlet 13. The filter inlet 13 is connected to the inlet pipe 1. The filter drain hole 22 is located between the backwash drain cylinder 4 and the filter inlet 13. The backwash inlet cylinder 6 is located between the backwash drain cylinder 4 and the filter drain hole 22.

[0026] The hydraulic pipe 2 is installed on the device bracket 8. A drain outlet 5 is provided at the bottom of the hydraulic pipe 2. The drain outlet 5 is connected to the backwash drain cylinder 4. The flushing sewage enters the backwash drain cylinder 4 through the backwash outlet 12 and the second backwash inlet 16, and then enters the drain outlet 5 for discharge. The hydraulic pipe 2 is also equipped with a backwash guide pipe 7. The backwash guide pipe 7 is fixed outside the filter pipe 14. One end of the backwash guide pipe 7 is connected to the filter outlet 15, and the other end of the backwash guide pipe 7 is connected to the inlet end of the filter inlet 23. The backwash inlet 16 is connected to the filter inlet 13 through the filter outlet hole 17, and the filter drain hole 22 is connected to the filter outlet 15 through the filter inlet 23.

[0027] A backwashing port unit is also provided, which includes a first backwashing outlet, a first backwashing inlet, a second backwashing outlet, a second backwashing inlet, and a third backwashing outlet. A backwashing guide pipe 7 is provided at the bottom of the filter tube 14. One end of the backwashing guide pipe 7 is connected to the first backwashing outlet, and the other end of the backwashing guide pipe 7 is connected to the first backwashing inlet. The filter inlet 13 is connected to the backwashing inlet cylinder 6 through the backwashing guide pipe 7. The backwashing inlet cylinder 6 is connected to the second backwashing inlet through the second backwashing outlet. The backwashing drain cylinder 4 is connected to the second backwashing outlet through the second backwashing inlet. A drain pipe is also provided at the bottom of the filter tube 14, and the drain pipe is connected to the backwashing drain cylinder 4 through the third backwashing outlet.

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0029] A manual backwashing filtration device includes an inlet pipe 1, a hydraulic pipe 2, a filter chamber 20, and an outlet pipe 9. The filter chamber 20 is equipped with a primary filter element 18 and a secondary filter element 19. A filter tube 14 is provided at the bottom of the filter chamber 20. The filter tube 14 is sleeved on the outside of the hydraulic pipe 2. The hydraulic pipe 2 and the filter tube 14 are rotatably connected. The inlet pipe 1 and the outlet pipe 9 are respectively fixed at both ends of the hydraulic pipe 2 and are respectively connected to the hydraulic pipe 2. A filter chamber cover 21 is also provided at the top of the filter chamber 20.

[0030] The outlet pipe 9 is equipped with a filter outlet 15. The inlet end of the filter outlet 15 is connected to the hydraulic pipe 2, and the outlet end of the filter outlet 15 is connected to the outlet pipe 9. The primary filter element 18, the secondary filter element 19 and the filter outlet 15 have the same filtration accuracy level. The primary filter element 18 and the secondary filter element 19 are the filter media under normal working conditions, while the filter outlet 15 filters a small amount of water that has not been filtered by the primary filter element and the secondary filter element during the switching between the working modes of "filtration" and "backwashing".

[0031] The hydraulic pipe 2 is equipped with a reversible backwash valve 11, the bottom of which is fixedly connected to the hydraulic pipe 2. The backwash valve 11 is equipped with a flange connection 10, and is fixedly connected to the hydraulic pipe 2 through the flange connection 10 and fixing bolts. The hydraulic pipe 2 is equipped with a filter hole unit and a backwash hole unit that are respectively connected to the primary filter element 18 and the secondary filter element 19. The center line of the filter hole unit is perpendicular to the center line of the backwash hole unit.

[0032] As a further embodiment, one end of the hydraulic pipe 2 is closed, and the other end of the hydraulic pipe 2 is connected to the inlet pipe 1. A sealing plate 3 is provided inside the hydraulic pipe 2, which divides the hydraulic pipe 2 into a backwash drain cylinder 4, a backwash inlet cylinder 6, a filter drain hole 22, and a filter inlet 13. The filter inlet 13 is connected to the inlet pipe 1, the filter drain hole 22 is located between the backwash drain cylinder 4 and the filter inlet 13, and the backwash inlet cylinder 6 is located between the backwash drain cylinder 4 and the filter drain hole 22.

[0033] The top of the filter tube 14 is provided with a filter inlet 13, a filter outlet 15, a backwash inlet 16, and a backwash outlet 12. The filter inlet 13, filter outlet 15, backwash inlet 16, and backwash outlet 12 are all located inside the filter chamber 20. The filter inlet 13 and backwash outlet 12 are located on both sides of the primary filter element 18 and the secondary filter element 19, respectively. The filter outlet 15 and backwash inlet 16 are both located at the bottom of the secondary filter element 18 and the secondary filter element 19.

[0034] The hydraulic pipe 2 is also equipped with a backwashing guide pipe 7, which is fixed outside the filter pipe 14. One end of the backwashing guide pipe 7 is connected to the filter outlet 15, and the other end of the backwashing guide pipe 7 is connected to the inlet end of the filter inlet 23.

[0035] The filter unit includes a filter outlet 17 and a filter inlet 23. The backwash inlet 16 is connected to the filter inlet 13 through the filter outlet 17, and the filter drain 22 is connected to the filter outlet 15 through the filter inlet 23.

[0036] The backwashing port unit includes a first backwashing outlet, a first backwashing inlet, a second backwashing outlet, a second backwashing inlet, and a third backwashing outlet. The bottom of the filter tube 14 is provided with a backwashing guide pipe 7. One end of the backwashing guide pipe 7 is connected to the first backwashing outlet, and the other end of the backwashing guide pipe 7 is connected to the first backwashing inlet. The filter inlet is connected to the backwashing inlet cylinder through the backwashing guide pipe 7. The backwashing inlet cylinder is connected to the backwashing inlet through the second backwashing outlet. The backwashing drain cylinder is connected to the backwashing outlet through the second backwashing inlet. The bottom of the filter tube is also provided with a drain pipe, which is connected to the backwashing drain cylinder through the third backwashing outlet.

[0037] On the cylindrical surface of the filter tube 14, the opening angle is 90°. Under the action of external force, the backwash valve 11 can drive the hydraulic tube 2 to rotate within the range of 0-90°. The water circuit is switched by rotating the hydraulic tube 2, and backwashing is achieved by changing the direction of internal and external water flow. The filter screen is cleaned quickly and thoroughly.

[0038] When the backwash valve 11 is in the 0° (vertical) position, it is in the "filtering" state. At this time, the pressurized water flows into the filter inlet 13 through the inlet pipe 1, and then enters the outer side of the primary filter element 18 and the secondary filter element 19 through the backwash inlet 16. After filtration, it flows through the inner side of the primary filter element 18 and the secondary filter element 19, through the filter outlet 15, into the filter drain hole 22, and then flows out through the filter drain hole 22 and finally out through the outlet pipe 4.

[0039] When the backwash valve 11 is in the 90° (horizontal) position, it is in the "backwash" state. At this time, the water flows in through the inlet pipe 1 and enters the backwash inlet 16. Then, it enters the backwash inlet 16 through the first backwash outlet 12, the backwash hydraulic pipe 2, and the first backwash inlet cylinder 6. Then, the water flows through the secondary filter element 19 and the filter inlet 13 to the primary filter element 18. The water flows from the inside of the secondary filter element 19 to the outside of the primary filter element 18 and the secondary filter element 19, forming flushing wastewater. Then, the flushing wastewater enters the backwash drain cylinder 4 through the backwash outlet 12 and the second backwash inlet 16. Finally, the flushing wastewater enters the drain outlet 5 and is discharged. This process can discharge the silt accumulated in the "filtration" working state and the impurities on the outside of the primary filter element 18 and the secondary filter element 19 together with the water flow.

[0040] This environmentally friendly, water-saving backwashing filter is equipped with sealing rings or gaskets at all joints and the connection points between holes to prevent leakage. This filter allows for self-backwashing of individual units, eliminating the need for multiple units in parallel or other external equipment. It is low-cost, highly adaptable, simple to install and operate, and easy to promote.

[0041] The contents not described in detail in this specification are existing technologies known to those skilled in the art. The standard parts used can be purchased from the market, and the irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology, and the circuit connection adopts conventional connection methods in the existing technology, which will not be described in detail here.

[0042] This utility model is not limited to the above-described embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of this utility model shall be considered equivalent substitutions and shall be included within the protection scope of this utility model.

Claims

1. An environmentally friendly, water-saving, backwashing filter device, characterized in that: The system includes an inlet pipe (1), a hydraulic pipe (2), an outlet pipe (9), and a filter chamber (20). The filter chamber (20) contains a primary filter element (18) and a secondary filter element (19). The secondary filter element (19) is located inside the primary filter element (18). The top of the filter chamber (20) is fitted with a filter chamber cover (21). The bottom of the filter chamber (20) is fitted with a filter tube (14). The filter tube (14) is sleeved on the outside of the hydraulic pipe (2). The hydraulic pipe (2) and the filter tube (14) are rotatably connected. The inlet pipe (1) and the outlet pipe (9) are fixed to the two ends of the filter tube (14), respectively. The inlet pipe (1) and the outlet pipe (9) are both connected to the hydraulic pipe (2). The top of the filter tube (14) is fitted with a filter inlet (13) and a filter outlet (15). The filter inlet (13), filter outlet (15), backwash inlet (16), and backwash outlet (12) are all located inside the filter chamber (20). The filter inlet (13) and backwash outlet (12) are located on both sides of the secondary filter element (19) and the primary filter element (18), respectively. The filter outlet (15) and backwash inlet (16) are both located at the bottom of the secondary filter element (19). The filter outlet (15) is located inside the outlet pipe (9). The inlet end of the filter outlet (15) is connected to the hydraulic pipe (2). The outlet end of the filter outlet (15) is connected to the secondary filter element (19) and is connected to the outlet pipe (9). The filter inlet (13) is connected to the inlet pipe (1).

2. The environmentally friendly, water-saving, backwashing filter device as described in claim 1, characterized in that: The hydraulic pipe (2) is provided with a reversible backwash valve (11), and the backwash valve (11) is provided with a flange connection (10). The bottom of the backwash valve (11) is fixedly connected to the hydraulic pipe (2) through the flange connection (10).

3. The environmentally friendly, water-saving, backwashing filter device as described in claim 2, characterized in that: The filter tube (14) has a 90° opening angle on its cylindrical surface. The backwash valve (11) drives the hydraulic tube (2) to rotate within a range of 0-90° under the action of external force. The water circuit is switched by rotating the hydraulic tube (2), and backwashing is achieved by changing the direction of the internal and external water flow.

4. The environmentally friendly, water-saving, backwashing filter device as described in claim 1, characterized in that: The hydraulic pipe (2) is provided with a filter outlet (15) and a backwash inlet (16) that are respectively connected to the primary filter element (18) and the secondary filter element (19). The center line of the filter outlet (15) is perpendicular to the center line of the backwash inlet (16).

5. The environmentally friendly, water-saving, backwashing filter device as described in claim 1, characterized in that: One end of the hydraulic pipe (2) is closed, and the other end of the hydraulic pipe (2) is connected to the inlet pipe (1). A sealing plate (3) is provided inside the hydraulic pipe (2). The sealing plate (3) divides the hydraulic pipe (2) into a backwash drain cylinder (4), a backwash inlet cylinder (6), a filter drain hole (22), and a filter inlet (13). The filter inlet (13) is connected to the inlet pipe (1). The filter drain hole (22) is located between the backwash drain cylinder (4) and the filter inlet (13). The backwash inlet cylinder (6) is located between the backwash drain cylinder (4) and the filter drain hole (22).

6. The environmentally friendly, water-saving, backwashing filter device as described in claim 5, characterized in that: It also includes a filter outlet (17) and a filter inlet (23). The backwash inlet (16) is connected to the filter inlet (13) through the filter outlet (17), and the filter drain hole (22) is connected to the filter outlet (15) through the filter inlet (23).

7. The environmentally friendly, water-saving, backwashing filter device as described in claim 1, characterized in that: The hydraulic pipe (2) is also provided with a backwashing drain pipe (7). The backwashing drain pipe (7) is fixed outside the filter pipe (14). One end of the backwashing drain pipe (7) is connected to the filter outlet (15), and the other end of the backwashing drain pipe (7) is connected to the inlet end of the filter inlet (23).

8. The environmentally friendly, water-saving, backwashing filter device as described in claim 1, characterized in that: The hydraulic pipe (2) is installed on the device bracket (8). The bottom of the hydraulic pipe (2) is provided with a drain port (5). The drain port (5) is connected to the backwash drain cylinder (4). The flushing sewage enters the backwash drain cylinder (4) through the backwash outlet (12) and the second backwash inlet (16), and then enters the drain port (5) for discharge.

9. The environmentally friendly, water-saving, backwashing filter device as described in claim 8, characterized in that: A backwashing hole unit is also provided, which includes a first backwashing outlet hole, a first backwashing inlet hole, a second backwashing outlet hole, a second backwashing inlet hole, and a third backwashing outlet hole. A backwashing guide pipe (7) is provided at the bottom of the filter tube (14). One end of the backwashing guide pipe (7) is connected to the first backwashing outlet hole, and the other end of the backwashing guide pipe (7) is connected to the first backwashing inlet hole. The filter inlet (13) is connected to the backwashing inlet cylinder (6) through the backwashing guide pipe (7). The backwashing inlet cylinder (6) is connected to the second backwashing inlet through the second backwashing outlet hole. The backwashing drain cylinder (4) is connected to the second backwashing outlet through the second backwashing inlet hole. A drain pipe is also provided at the bottom of the filter tube (14). The drain pipe is connected to the backwashing drain cylinder (4) through the third backwashing outlet hole.

10. The environmentally friendly, water-saving, backwashing filter device as described in any one of claims 1 to 9, characterized in that: The primary filter element (18), the secondary filter element (19), and the filter outlet (15) have the same filtration accuracy level. The primary filter element (18) and the secondary filter element (19) are the filter media under normal working conditions. The filter outlet (15) is used to filter a small amount of water that has not been filtered by the primary filter element (18) and the secondary filter element (19) during the switching between filtration and backwashing working conditions.

Images