Automatic backwashing filtering device

Abstract

The utility model discloses an automatic backwash filtering device, and belongs to the field of backwash filtering devices.The automatic backwash filtering device comprises a filter cartridge and a filter element fixedly installed in the filter cartridge, the filter element is a filter screen rolled into a barrel shape, a water inlet pipe connected with the inlet end of the filter element is fixedly connected to the filter cartridge, and a water outlet pipe connected with the water inlet end of the filter element is fixedly connected to the filter cartridge. The filter cartridge is provided with a water outlet pipe communicated with the interior of the filter cartridge, a backwashing pipe communicated with the interior of the filter cartridge, and a blow-off pipe connected with the outlet end of the filter element. According to the automatic backwashing filtering device, backwashing is carried out through the stirring mechanism in a rotary stirring mode, direct impact of high-pressure water flow on the filter element is avoided, impact damage to the filter element is reduced, the service life of the filter element is prolonged, meanwhile, backwashing water flow forms a rotary flow state, the washing effect of the water flow on dirt and impurities on the filter element is enhanced, and the filtering efficiency is improved. Therefore, the backwashing efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of backwashing filtration devices, and specifically to an automatic backwashing filtration device. Background Art

[0002] A backwashing filtration device is a precision device that directly intercepts impurities in water using a filter element, removes suspended solids and particulate matter in the water body, reduces turbidity, purifies water quality, and reduces the generation of system dirt, bacteria, algae, rust, etc.

[0003] For some application scenarios with high filtration accuracy, during the filtration process, dirt and impurities in the water will gradually accumulate on the fine filter screen, forming a filtration impurity layer, causing blockage, thereby affecting the filtration effect and filtration efficiency. If the backwashing efficiency is low, the backwashing process will take a long time, thus affecting the overall working efficiency of the filtration system.

[0004] Most of the existing backwashing filters improve the backwashing efficiency by increasing the flow rate of the backwashing water flow to form a high-pressure flushing effect, so as to shorten the backwashing process. However, high-pressure flushing also brings impact damage to the filter element, and has high requirements for the strength of the filter element material. Otherwise, the service life of the filter element will be short.

[0005] Therefore, this application provides an automatic backwashing filtration device that can improve the backwashing efficiency without increasing the backwashing water pressure to solve the above problems. Utility Model Content

[0006] This application provides an automatic backwashing filtration device, aiming to solve the problem that the existing backwashing filters are prone to damage the filter element by increasing the backwashing water pressure to improve the cleaning efficiency as mentioned in the background art.

[0007] To achieve the above object, this application provides the following technical solution: An automatic backwashing filtration device includes a filter cylinder and a filter element fixedly installed inside the filter cylinder.

[0008] The filter element is a filter screen rolled into a cylindrical shape. An inlet pipe connected to the inlet end of the filter element is fixedly connected to the filter cylinder. The filter cylinder has an outlet pipe communicating with the inside of the filter cylinder, a backwashing pipe communicating with the inside of the filter cylinder, and a sewage discharge pipe connected to the outlet end of the filter element. Electric valves are provided on the inlet pipe, the backwashing pipe, the sewage discharge pipe, and the outlet pipe.

[0009] A stirring mechanism for driving the backwash water flow to rotate is arranged inside the filter cartridge. The stirring mechanism includes an internal gear sleeved outside the filter element and rotatably connected to the inner wall of the filter cartridge, a driving gear meshing with the internal gear, a servo motor fixedly installed on the outer wall of the filter cartridge and having an output end connected to the driving gear, and a plurality of blades fixedly connected to the end of the internal gear away from the servo motor and distributed in an annular array. In this way, the backwash is carried out by the stirring mechanism in a rotational stirring manner, avoiding the direct impact of high-pressure water flow on the filter element, reducing the impact damage to the filter element, prolonging the service life of the filter element, and at the same time, making the backwash water flow form a rotational flow state, enhancing the scouring effect of the water flow on the dirt and impurities on the filter element, thereby improving the backwash efficiency.

[0010] Preferably, an inlet pressure difference sensor is provided on the inlet pipe, and an outlet pressure difference sensor is provided on the outlet pipe.

[0011] Preferably, the inlet pressure difference sensor, the outlet pressure difference sensor, and the electric valve are all connected to an external control system.

[0012] Preferably, a flange cover is fixedly installed at one end of the filter cartridge away from the sewage pipe by bolts and nuts.

[0013] Preferably, a gasket is provided between the flange cover and the filter cartridge.

[0014] Preferably, flanges are provided at the ends of the outlet pipe, the inlet pipe, the backwash pipe, and the sewage pipe.

[0015] Preferably, at least two groups of ultrasonic vibrators are arranged on the side of the filter cartridge in a staggered manner.

[0016] This automatic backwash filtering device performs backwashing by the stirring mechanism in a rotational stirring manner, avoiding the direct impact of high-pressure water flow on the filter element, reducing the impact damage to the filter element, prolonging the service life of the filter element, and at the same time, making the backwash water flow form a rotational flow state, enhancing the scouring effect of the water flow on the dirt and impurities on the filter element, thereby improving the backwash efficiency.

[0017] During backwashing, the ultrasonic vibrators transmit vibrations inside the filter cartridge, loosening the impurities attached to the filter element. Cooperating with the rotational water flow driven by the stirring mechanism, it is easier to dredge the filter screen of the filter element, thereby further improving the backwash effect and efficiency, further shortening the backwash process, and improving the overall efficiency of the filtering system. Description of the Drawings

[0018] Figure 1 It is a structural schematic diagram of an automatic backwash filtering device;

[0019] Figure 2 It is a schematic diagram of the internal structure of an automatic backwashing filtration device;

[0020] Figure 3 It is a schematic diagram of the structure of the agitation mechanism in an automatic backwashing filtration device.

[0021] In the figure:

[0022] 1. Filter cylinder; 11. Flange cover; 12. Water outlet pipe; 121. Outlet pressure difference sensor;

[0023] 13. Sewage discharge pipe; 14. Ultrasonic vibrator;

[0024] 2. Water inlet pipe; 21. Inlet pressure difference sensor; 3. Backwashing pipe;

[0025] 4. Agitation mechanism; 41. Internal gear; 411. Paddle; 42. Driving gear; 43. Servo motor;

[0026] 5. Filter element; 6. Electric valve. Specific implementation mode

[0027] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0028] Embodiment 1

[0029] This embodiment provides an automatic backwashing filtration device, as Figures 1 - 3 shown, the automatic backwashing filtration device includes a filter cylinder 1 and a filter element 5 fixedly installed in the filter cylinder 1.

[0030] The filter element 5 is a filter screen rolled into a cylindrical shape. A water inlet pipe 2 connected to the inlet end of the filter element 5 is fixedly connected to the filter cylinder 1. The filter cylinder 1 has a water outlet pipe 12 communicating with the inside of the filter cylinder 1. The filter cylinder 1 has a backwashing pipe 3 communicating with the inside of the filter cylinder 1. The filter cylinder 1 has a sewage discharge pipe 13 connected to the outlet end of the filter element 5. Electric valves 6 are provided on the water inlet pipe 2, the backwashing pipe 3, the sewage discharge pipe 13, and the water outlet pipe 12.

[0031] Inside the filter cartridge 1, there is a stirring mechanism 4 for driving the backwash water flow to rotate. The stirring mechanism 4 includes an internal gear 41 sleeved outside the filter element 5 and rotatably connected to the inner wall of the filter cartridge 1, a driving gear 42 meshing with the internal gear 41, a servo motor 43 fixedly installed on the outer wall of the filter cartridge 1 and with its output end connected to the driving gear 42, and a plurality of blades 411 fixedly connected to one end of the internal gear 41 away from the servo motor 43 and distributed in an annular array.

[0032] During use, in the normal filtration stage, the water to be filtered enters the inside of the filter element 5 through the water inlet pipe 2. After the water is filtered by the filter screen of the filter element 5, it overflows into the inside of the filter cartridge 1, and the clean water is then discharged through the water outlet pipe 12 to achieve water quality purification; in the backwash preparation stage, the electric valves 6 on the water inlet pipe 2 and the water outlet pipe 12 are closed to stop the normal filtration process, and the electric valves 6 on the backwash pipe 3 and the sewage discharge pipe 13 are opened to prepare for backwashing; in the backwash stage, the servo motor 43 is started to drive the driving gear 42 to rotate, and then drive the internal gear 41 meshing with the driving gear 42 to rotate. The rotation of the internal gear 41 drives the blades 411 distributed in an annular array thereon to rotate, forming a rotating water flow. The rotating water flow passes through the outside of the filter element 5, generating a strong stirring effect, loosening and falling off the dirt and impurities on the filter element 5. The fallen dirt and impurities are discharged through the sewage discharge pipe 13 with the water flow to achieve the cleaning of the filter element 5; in the backwash end stage, the electric valves 6 on the backwash pipe 3 and the sewage discharge pipe 13 are closed to stop the backwash process, and the electric valves 6 on the water inlet pipe 2 and the water outlet pipe 12 are opened to resume the normal filtration process; compared with the traditional high-pressure flushing method, the present application uses a rotating stirring method for backwashing, avoiding the direct impact of high-pressure water flow on the filter element 5, reducing the impact damage to the filter element 5, and prolonging the service life of the filter element 5.

[0033] Furthermore, there is an inlet pressure difference sensor 21 on the water inlet pipe 2 and an outlet pressure difference sensor 121 on the water outlet pipe 12. The inlet pressure difference sensor 21, the outlet pressure difference sensor 121, and the electric valve 6 are all connected to an external control system; the inlet pressure difference sensor 21 and the outlet pressure difference sensor 121 respectively monitor the pressure at the water inlet and the pressure at the water outlet, and transmit the signals to the external control system in real time through electrical signals. The higher the difference between the two represents the more serious the blockage of the filter element 5. When the difference reaches a preset value, the backwash stage is started through the external control system. The control system will automatically close the water inlet pipe 2 and the water outlet pipe 12, open the backwash pipe 3 and the sewage discharge pipe 13, and start the stirring mechanism 4 for backwashing, thereby realizing automation, making the backwashing more timely, and improving the working efficiency of the overall filtration system.

[0034] One end of the filter cartridge 1 away from the sewage discharge pipe 13 is fixedly installed with a flange cover 11 through bolts and nuts, and a gasket is arranged between the flange cover 11 and the filter cartridge 1. This design makes the disassembly, assembly and maintenance of the filter cartridge 1 more convenient, and at the same time ensures the overall sealing performance and safety of the filtration system.

[0035] It should be noted that the ends of the water outlet pipe 12, the water inlet pipe 2, the backwash pipe 3 and the sewage discharge pipe 13 are all provided with flange plates, which are installed at the ends of the respective pipes to achieve the connection and sealing between the pipes.

[0036] Embodiment 2

[0037] Different from Embodiment 1, when the filter element is severely blocked and cannot be cleaned by the rotating backwash water flow, the backwash efficiency will be affected. Therefore, at least two groups of ultrasonic vibrators 14 are staggeredly distributed on the side of the filter cartridge 1.

[0038] During backwashing, the ultrasonic vibrators 14 transmit vibrations inside the filter cartridge 1 to loosen the impurities attached to the filter element 5. Cooperating with the water flow rotation driven by the stirring mechanism 4, it is easier to dredge the filter screen of the filter element 5, thereby further improving the backwash effect and efficiency, further shortening the backwash process, and improving the overall efficiency of the filtration system.

[0039] The above is only the preferred specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application, according to the technical solution and its concept of the present application, makes equivalent replacements or changes, and should be covered within the protection scope of the present application.

Claims

1. An automatic backwashing filtration device, comprising a filtration cylinder (1) and a filter element (5) fixedly installed in the filtration cylinder (1), characterized in that: The filter element (5) is a filter screen rolled into a cylindrical shape. A water inlet pipe (2) connected to the inlet end of the filter element (5) is fixedly connected to the filter cylinder (1). The filter cylinder (1) is provided with a water outlet pipe (12) communicating with the inside of the filter cylinder (1), a backwash pipe (3) communicating with the inside of the filter cylinder (1), and a sewage discharge pipe (13) connected to the outlet end of the filter element (5). Electric valves (6) are arranged on the water inlet pipe (2), the backwash pipe (3), the sewage discharge pipe (13), and the water outlet pipe (12). A stirring mechanism (4) for driving the backwash water flow to rotate is arranged inside the filter cylinder (1). The stirring mechanism (4) includes an internal gear (41) sleeved outside the filter element (5) and rotatably connected to the inner wall of the filter cylinder (1), a driving gear (42) meshing with the internal gear (41), a servo motor (43) fixedly installed on the outer wall of the filter cylinder (1) and having an output end connected to the driving gear (42), and a plurality of blades (411) fixedly connected to one end of the internal gear (41) far from the servo motor (43) and distributed in an annular array.

2. The automatic backwashing filtration device according to claim 1, wherein: An inlet differential pressure sensor (21) is arranged on the water inlet pipe (2), and an outlet differential pressure sensor (121) is arranged on the water outlet pipe (12).

3. The automatic backwashing filtration device according to claim 2, wherein: The inlet differential pressure sensor (21), the outlet differential pressure sensor (121), and the electric valve (6) are all connected to an external control system.

4. The automatic backwashing filtration device according to claim 3, characterized in that: A flange cover (11) is fixedly installed at one end of the filter cylinder (1) far from the sewage discharge pipe (13) by bolts and nuts.

5. The automatic backwashing filtration device according to claim 4, characterized in that: A gasket is arranged between the flange cover (11) and the filter cylinder (1).

6. The automatic backwashing filtration device according to claim 5, characterized in that: Flange plates are arranged at the ends of the water outlet pipe (12), the water inlet pipe (2), the backwash pipe (3), and the sewage discharge pipe (13).

7. The automatic backwashing filtration device according to claim 6, characterized in that: At least two groups of ultrasonic vibrators (14) are arranged on the side surface of the filter cylinder (1) in a staggered manner.

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