A water filtration device with an automatic cleaning function

Abstract

The present invention relates to a water filtering device with an automatic cleaning function, comprising: a water tank, an ultrafiltration membrane sheet assembly, a buoyancy lifting frame, guide rails and brushes; there are multiple groups of ultrafiltration membrane sheet assemblies, and the ultrafiltration membrane sheet assemblies are vertically and juxtaposedly installed and fixed in the water tank, with aisles left between each ultrafiltration membrane sheet assembly. The ultrafiltration membrane sheet assembly includes an ultrafiltration membrane sheet, a lower support frame and an upper fixing frame; the buoyancy lifting frame is arranged in the water tank, the guide rails are longitudinally installed on both sides of the water tank, and the buoyancy lifting frame is installed on the guide rails and can move up and down relative to the water tank and the ultrafiltration membrane sheet assembly without touching each other; there are multiple groups of brushes, and the brushes are installed and fixed on the buoyancy lifting frame. The position of each group of brushes is matched with the corresponding aisle interval of the ultrafiltration membrane sheet assembly and contacts the surface of the ultrafiltration membrane sheet. The brushes can move up and down in the aisle between the ultrafiltration membrane sheet assemblies following the buoyancy lifting frame. It has the advantages of comprehensively cleaning the surface of the ultrafiltration membrane sheet and reducing the equipment cost, etc.

Description

Technical Field

[0001] The present invention relates to a water purification device, in particular to a ceramic ultrafiltration membrane water purification device with an automatic cleaning function, belonging to the technical fields of environmental protection technology and equipment manufacturing technology. Background Art

[0002] Ceramic ultrafiltration membrane sheets (hereinafter referred to as ultrafiltration membrane sheets) have been widely used in the water purification field as a high-performance water filtration material. However, ultrafiltration membrane sheets must be used with relevant equipment. Currently, the most common method is to install ultrafiltration membrane sheets in a sealed tank. After the ultrafiltration membrane sheets are used for a period of time, dirt will accumulate on their surfaces. If not cleaned in time, the filtration microchannels of the ultrafiltration membrane sheets will be blocked and become ineffective. Currently, the cleaning methods for ultrafiltration membrane sheets during use include backwashing, chemical cleaning, and physical cleaning. The backwashing method is to perform reverse high-pressure backwashing on the ultrafiltration membrane sheets with high-pressure water or high-pressure air. However, this method will cause some particulate matter to be reversely stuck in the filter layer structure under the action of high pressure, resulting in permanent blockage. When multiple high-pressure backwashes are used, the performance of the ultrafiltration membrane sheets will gradually decline and it is difficult to recover. The chemical treatment method is to dissolve or decompose the dirt in the ultrafiltration membrane sheets with acid-base agents. However, the chemical treatment method will cause secondary pollution due to the use and discharge of chemical agents. The most commonly used means of physical cleaning is to wash the surface of the ultrafiltration membrane sheets. This method can solve the problem and will not cause pollution. However, the problem encountered is that each time of washing requires opening the filter tank or even taking out the ceramic ultrafiltration membrane sheets and cleaning them one by one. The workload is very large, and the water filtration operation must be stopped for a long time during the washing time. Especially for projects with poor water quality, frequent washing will increase the workload significantly and reduce the water filtration efficiency. Summary of the Invention

[0003] The object of the present invention is to overcome the deficiencies of the prior art and provide a water purification device with an automatic cleaning function. When the water pump injects water and drains water into and from the buoyancy lifting frame, the buoyancy and gravity generated cause the buoyancy lifting frame to descend and ascend. The brush installed on the buoyancy lifting frame also moves up and down following its movement. The brush walks up and down on the surface of the ultrafiltration membrane sheet to comprehensively clean the surface of the ultrafiltration membrane sheet. Without adding other power and transmission devices, the power required for the cleaning operation can be obtained, avoiding the problem that the power or transmission device is difficult to adapt to underwater operation, and also avoiding the leakage problem caused by poor connection and sealing of the mechanical transmission mechanism inside and outside the water tank, reducing the leakage and mechanical failure rate, and also reducing the equipment cost.

[0004] To achieve the above object, the technical solution of the present invention is realized as follows. It is a water purification device with an automatic cleaning function, characterized by including:

[0005] Water tank; an inlet, a purified water outlet and a sewage outlet are provided on the water tank, and the inlet is communicated with the water to be purified outside;

[0006] Ultrafiltration membrane module; there are multiple groups of the ultrafiltration membrane modules, and the ultrafiltration membrane modules are installed and fixed vertically and side by side in the water tank, and there are aisles between the ultrafiltration membrane modules. The ultrafiltration membrane module includes an ultrafiltration membrane, a lower support frame and an upper fixing frame. The lower support frame is installed at the lower part of the ultrafiltration membrane, and the upper fixing frame is installed at the upper part of the ultrafiltration membrane;

[0007] Buoyancy lifting frame and guide rail; the buoyancy lifting frame is arranged in the water tank, and the structures between the water tank and the ultrafiltration membrane module and the buoyancy lifting frame are relatively independent and do not form a rigid connection. The guide rails are longitudinally installed on both sides of the water tank, and the buoyancy lifting frame is installed on the guide rails and can move up and down relative to the water tank and the ultrafiltration membrane module without touching each other; and

[0008] Brush; there are multiple groups of the brushes, and the brushes are installed and fixed on the buoyancy lifting frame. The position of each group of brushes is matched with the corresponding aisle section of the ultrafiltration membrane module and contacts the surface of the ultrafiltration membrane. The brushes can move up and down in the aisle between the ultrafiltration membrane modules following the buoyancy lifting frame.

[0009] In this technical solution, the buoyancy lifting frame is made of a hollow material, and a water inlet pump and a water outlet pump are provided on the buoyancy lifting frame. The water outlet of the water inlet pump is communicated with the inner cavity of the hollow material so as to inject water into the buoyancy lifting frame, and the water inlet of the water outlet pump is communicated with the inner cavity of the hollow material so as to drain water from the buoyancy lifting frame.

[0010] In this technical solution, a ventilation pipe is connected to the buoyancy lifting frame, and the upper port of the ventilation pipe is arranged at the top position inside the water tank;

[0011] In this technical solution, the water tank is a sealed box body with a top cover, and is composed of metal pipes and plates.

[0012] In this technical solution, the ultrafiltration membrane is provided with a water outlet pipe, and all the water outlet pipes are communicated with the purified water outlet of the water tank through pipelines.

[0013] In this technical solution, the water tank frame structural member is composed of hollow profiles and can also serve as a water passing pipeline.

[0014] In this technical solution, there are multiple guide rails. An upper limit structure is provided at the upper part of the guide rails, and a lower limit structure is provided at the lower part of the guide rails.

[0015] In this technical solution, multiple guide wheels are provided on the buoyancy lifting frame, and the guide wheels contact the corresponding guide rails, so that the buoyancy lifting frame moves up and down along the guide rails.

[0016] The advantages of the present invention compared with the prior art are as follows: When the buoyancy lifting frame is filled with water and drained by a water pump, the buoyancy and gravity act to make the buoyancy lifting frame descend and ascend. The brush installed on the buoyancy lifting frame also moves up and down following its lifting and lowering. The brush walks up and down on the surface of the ultrafiltration membrane sheet, enabling the surface of the ultrafiltration membrane sheet to be comprehensively cleaned. Without adding other power and transmission devices, the power required for the cleaning operation can be obtained, avoiding the problem that the power or transmission device is difficult to adapt to underwater operation, and also avoiding the leakage problem caused by poor connection and sealing of the mechanical transmission mechanism inside and outside the water tank. It reduces the leakage of electricity and mechanical failure rate, and also reduces the equipment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present invention in the front view direction;

[0018] Figure 2 is a schematic structural diagram of the present invention in the top view direction. DETAILED DESCRIPTION OF THE INVENTION

[0019] The following further describes the specific embodiments of the present invention with reference to the drawings. It should be noted here that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation to the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0020] In the description of the present invention, the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention rather than requiring the present invention to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0021] As Figure 1 and Figure 2 shown, a water filtering device with an automatic cleaning function includes:

[0022] A water tank 1; an inlet 11, a purified water outlet 12, and a sewage outlet 13 are provided on the water tank 1, and the inlet 11 is communicated with the water to be purified outside.

[0023] An ultrafiltration membrane sheet assembly 2; the ultrafiltration membrane sheet assembly 2 is in multiple groups, and the ultrafiltration membrane sheet assemblies 2 are installed and fixed side by side vertically in the water tank 1. An aisle 21 is left between the ultrafiltration membrane sheet assemblies 2. The ultrafiltration membrane sheet assembly 2 includes an ultrafiltration membrane sheet 22, a lower support frame 23, and an upper fixing frame 24. The lower support frame 23 is installed at the lower part of the ultrafiltration membrane sheet 22, and the upper fixing frame 24 is installed at the upper part of the ultrafiltration membrane sheet 22.

[0024] A buoyancy lifting frame 3 and guide rails 4; the buoyancy lifting frame 3 is arranged in the water tank 1, and the structures between the water tank 1 and the ultrafiltration membrane module 2 and the buoyancy lifting frame 3 are relatively independent and do not form a rigid connection. The guide rails 4 are longitudinally installed on both sides of the water tank 1, and the buoyancy lifting frame 3 is installed on the guide rails 4 and can move up and down relative to the water tank 1 and the ultrafiltration membrane module 2 without touching each other; and

[0025] Brushes 5; there are multiple groups of the brushes 5, and the brushes 5 are installed and fixed on the buoyancy lifting frame 3. The position of each group of brushes 5 cooperates with the corresponding aisle 21 interval of the ultrafiltration membrane module 2 and contacts the surface of the ultrafiltration membrane 22. The brushes 5 can move up and down in the aisle 21 between the ultrafiltration membrane modules 2 following the buoyancy lifting frame 3.

[0026] In this embodiment, the buoyancy lifting frame 3 is made of a hollow material. An inlet water pump 61 and an outlet water pump 62 are provided on the buoyancy lifting frame 3. The outlet of the inlet water pump 61 is communicated with the inner cavity of the hollow material so as to inject water into the buoyancy lifting frame 3, and the inlet of the outlet water pump 62 is communicated with the inner cavity of the hollow material so as to drain water from the buoyancy lifting frame 3.

[0027] In this embodiment, a ventilation pipe 32 is connected to the buoyancy lifting frame 3, and the upper port of the ventilation pipe 32 is arranged at the top position inside the water tank 1;

[0028] In this embodiment, the water tank 1 is a sealed box body with a top cover and is composed of metal pipes and plates.

[0029] In this embodiment, the ultrafiltration membrane 22 is provided with a water outlet pipe, and all the water outlet pipes are communicated with the purified water outlet of the water tank through pipelines.

[0030] In this embodiment, the frame structural members of the water tank 1 are made of hollow profiles and can also serve as water pipelines.

[0031] In this embodiment, there are multiple guide rails 4. An upper limit structure 41 is provided at the upper part of the guide rails 4, and a lower limit structure 42 is provided at the lower part of the guide rails 4.

[0032] In this embodiment, a plurality of guide wheels 31 are provided on the buoyancy lifting frame 3, and the guide wheels 31 contact the corresponding guide rails 4, so that the buoyancy lifting frame 3 moves up and down along the guide rails 4.

[0033] During operation, the water to be purified is injected into the water tank 1 through the water inlet. This embodiment is applicable to positive-pressure water filtration. During the water filtration operation, water continuously enters through the water inlet, always keeping the inside of the water tank 1 under positive pressure. After the water enters the water filtration layer of the ultrafiltration membrane 22 through pressure and is filtered, it flows out from the purified water outlet of the ultrafiltration membrane 22 to obtain purified water. The sewage outlet 13 of the water tank 1 is used to discharge the sewage generated by washing the ultrafiltration membrane.

[0034] All the ultrafiltration membrane components 2 are vertically installed and fixed on the inner skeleton in the water tank 1 by their lower support frames 23 and upper fixing frames 22. An aisle 21 is left between the ultrafiltration membrane components 2 as the working passage for the brush 5.

[0035] When the water in the buoyancy lifting frame 3 installed in the water tank 1 is emptied, it stays at the upper position under the action of buoyancy. When it is necessary to clean the ultrafiltration membrane 21, the water inlet water pump 61 is started to pump water from the water tank into the buoyancy lifting frame 3. Under the action of gravity, the buoyancy lifting frame 3 begins to descend along the guide rail 4. During the descent, the brush 5 follows the buoyancy lifting frame 3 and passes through the aisle 21 between the ultrafiltration membranes 22 from top to bottom to wash the surfaces of the ultrafiltration membranes 22 on both sides. When the buoyancy lifting frame 3 reaches the lower limit position, that is, when the brush 5 reaches the lowermost position of the ultrafiltration membrane 22, the water in the buoyancy lifting frame 3 is emptied through the water outlet water pump 62. When the buoyancy obtained by the buoyancy lifting frame 3 is greater than its own weight, the buoyancy lifting frame starts to rise, and the brush 5 also follows to continue washing the surface of the ultrafiltration membrane 22 from bottom to top. When the buoyancy lifting frame 3 reaches the upper limit position, that is, when the brush 5 reaches the uppermost position of the ultrafiltration membrane 22, a working cycle of up and down washing is completed. By setting the time intervals for the automatic water injection and drainage of the water inlet water pump 61 and the water outlet water pump 62, the function of starting the washing operation periodically can be realized.

[0036] The function of the guide rail 4 is to prevent the buoyancy lifting frame 3 from deviating during the up and down movement, and prevent the frame body from touching the components of the water tank 1 and the ultrafiltration membrane 22 components, so as to avoid being stuck or damaging the ultrafiltration membrane 22.

[0037] The air vent pipe 32 provided on the buoyancy lifting frame 3 is used to avoid being blocked by the internal air pressure when the water inlet water pump 61 and the water outlet water pump 62 inject water and drain water into it. Since when injecting water into the water tank 1 through an external high-pressure water pump, a part of the air will be retained in the sealed space above the water tank interior. When the upper port of the air vent pipe 32 connected to the buoyancy lifting frame 3 is set at a position near the top inside the water tank, it can be connected to this sealed space to realize exhaust and suction.

[0038] The water inlet water pump 61 and the water outlet water pump 62 are installed on the buoyancy lifting frame 3 and run up and down together with the brush 5 during operation. Using the water in the water tank for washing saves more water than using an external water source.

[0039] For the part of the pipeline connected to the outlet pipe, the hollow material in the adjacent water tank structure can be used as part of the pipeline, which can reduce the number of pipelines in the water tank and save space.

[0040] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the described embodiments. For those of ordinary skill in the art, various changes, modifications, substitutions and variations to these embodiments still fall within the protection scope of the present invention without departing from the principle and purpose of the present invention.

Claims

1. A water filtering device with an automatic cleaning function, characterized by comprising: A water tank (1); an inlet (11), a purified water outlet (12) and a sewage outlet (13) are provided on the water tank (1), and the inlet (11) is communicated with the water to be purified outside. Ultrafiltration membrane sheet assemblies (2); there are multiple groups of the ultrafiltration membrane sheet assemblies (2), and the ultrafiltration membrane sheet assemblies (2) are vertically and juxtaposedly installed and fixed in the water tank (1), with aisles (21) left between the ultrafiltration membrane sheet assemblies (2). The ultrafiltration membrane sheet assemblies (2) include ultrafiltration membrane sheets (22), lower support frames (23) and upper fixing frames (24). The lower support frames (23) are installed at the lower part of the ultrafiltration membrane sheets (22), and the upper fixing frames (24) are installed at the upper part of the ultrafiltration membrane sheets (22). A buoyancy lifting frame (3) and guide rails (4); the buoyancy lifting frame (3) is arranged in the water tank (1). The structures between the water tank (1), the ultrafiltration membrane sheet assemblies (2) and the buoyancy lifting frame (3) are relatively independent and do not form a rigid connection. The guide rails (4) are longitudinally installed on both sides of the water tank (1), and the buoyancy lifting frame (3) is installed on the guide rails (4) and can move up and down relative to the water tank (1) and the ultrafiltration membrane sheet assemblies (2) without touching each other; and Brushes (5); there are multiple groups of the brushes (5), and the brushes (5) are installed and fixed on the buoyancy lifting frame (3). The position of each group of brushes (5) is matched with the corresponding aisle (21) interval of the ultrafiltration membrane sheet assemblies (2) and contacts the surface of the ultrafiltration membrane sheets (22). The brushes (5) can move up and down in the aisle (21) between the ultrafiltration membrane sheet assemblies (2) following the buoyancy lifting frame (3). The buoyancy lifting frame (3) is made of a hollow material, and a water inlet pump (61) and a water outlet pump (62) are provided on the buoyancy lifting frame (3). The water outlet of the water inlet pump (61) is communicated with the inner cavity of the hollow material so as to inject water into the buoyancy lifting frame (3), and the water inlet of the water outlet pump (62) is communicated with the inner cavity of the hollow material so as to drain water from the buoyancy lifting frame (3). The frame structural members of the water tank (1) are made of hollow profiles and can also serve as water pipelines. There are multiple guide rails (4). An upper limit structure (41) is provided at the upper part of the guide rails (4), and a lower limit structure (42) is provided at the lower part of the guide rails (4).

2. The water filtration device with an automatic cleaning function according to claim 1, wherein A ventilation pipe (32) is connected to the buoyancy lifting frame (3), and the upper port of the ventilation pipe (32) is arranged at the top position inside the water tank (1).

3. The water filtration device with an automatic cleaning function according to claim 1, wherein The water tank (1) is a sealed box body with a top cover and is composed of metal pipes and plates.

4. The water filtering device with an automatic cleaning function according to claim 1, characterized in that The ultrafiltration membrane sheets (22) are provided with water outlet pipes, and all the water outlet pipes are communicated with the purified water outlet of the water tank through pipelines.

5. The water filtering device with an automatic cleaning function according to claim 1, characterized in that Multiple guide wheels (31) are provided on the buoyancy lifting frame (3), and the guide wheels (31) contact the corresponding guide rails (4), so that the buoyancy lifting frame (3) moves up and down along the guide rails (4).

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