A negative pressure suction flat sheet membrane filtration apparatus

Abstract

The utility model discloses a kind of negative pressure suction flat plate membrane filtration equipment, belong to membrane filtration technical field. Including filter box, several flat plate membranes in the filter box, negative pressure suction component;When using, sewage is injected into filter box from water inlet, negative pressure pump is rapidly started, stable negative pressure environment is formed below buckling cover, under the action of negative pressure suction, water flow is driven and quickly crosses the membrane wall of flat plate membrane, water molecule and solute less than membrane aperture can smoothly permeate, while macromolecular pollutants such as suspended solids, colloid, microorganism are accurately intercepted, this efficient filtration and accurate separation process makes sewage can be rapidly and deeply purified, and buckling cover is set between adjacent two flat plate membranes and forms stable negative pressure environment, reduces the loss in transmission process of negative pressure, so that every flat plate membrane can maintain the set negative pressure intensity, guarantee suction stability.

Description

Technical Field

[0001] This utility model relates to the field of membrane filtration technology, specifically to a negative pressure suction flat sheet membrane filtration device. Background Technology

[0002] With the increasing demands for effluent quality in wastewater treatment, reclaimed water reuse, and industrial wastewater purification, membrane filtration technology has become one of the core technologies in the field of water purification due to its advantages of efficient separation and precise retention of pollutants. Among them, flat-panel membrane filtration equipment is widely used in wastewater treatment and water purification due to its advantages of high separation efficiency and good effluent quality. Its core principle is to drive water flow through the membrane module through negative pressure to achieve the separation of pollutants from water molecules.

[0003] However, existing negative pressure suction flat sheet membrane filtration equipment still has many technical pain points in actual operation, which limit its application effect and promotion scope. For example, leakage or loss is prone to occur during the transmission of negative pressure, resulting in uneven negative pressure intensity between adjacent flat sheet membranes. In some areas, the suction power is insufficient, while in other areas, excessive negative pressure causes membrane surface deformation, which directly affects the filtration uniformity and membrane module service life.

[0004] Therefore, there is an urgent need for a negative pressure suction flat sheet membrane filtration device that can provide stable negative pressure intensity, high-efficiency filtration, and precise separation. Utility Model Content

[0005] To address the aforementioned problems, this utility model discloses a negative pressure suction flat sheet membrane filtration device.

[0006] The technical solution of this utility model is: a negative pressure suction flat sheet membrane filtration device, including a filter box, several flat sheet membranes disposed in the filter box, and a negative pressure suction component; The filter box has an inlet and an outlet on its left and right sides, respectively; several flat sheet membranes are distributed in parallel between the inlet and outlet. The negative pressure suction assembly includes a negative pressure pump, a snap-fit ​​cover movably installed on the upper end of the filter box and located between two adjacent flat membranes, several negative pressure suction pipes provided on each of the snap-fit ​​covers and extending to the bottom end of the filter box, several negative pressure branch pipes connected to each of the negative pressure suction pipes, and a negative pressure main pipe connected to each of the negative pressure branch pipes. The negative pressure main pipe is connected to the negative pressure pump, and the side wall of the negative pressure suction pipe is provided with several through holes.

[0007] Furthermore, a protective mesh is provided at the bottom of the snap-fit ​​cover corresponding to the periphery of each negative pressure suction tube, and a sealing airbag is provided at the connection between the snap-fit ​​cover and the filter box.

[0008] Note: The protective mesh cylinder is mainly used to prevent large particles or suspended matter from directly entering the negative pressure suction pipe, avoiding blockage of the through holes or damage to the negative pressure suction components. The sealing airbag forms an elastic seal after inflation, ensuring the airtightness of the connection between the snap-fit ​​cover and the filter box, preventing negative pressure leakage, maintaining stable suction efficiency, and facilitating the installation and removal of the snap-fit ​​cover.

[0009] Furthermore, a circulation pipe is provided between the water outlet and the water inlet, and a circulation pump and a flow control valve are provided on the circulation pipe.

[0010] Note: The circulation pipe allows some of the filtered water to flow back from the outlet to the inlet, achieving water circulation filtration. The circulation pump provides circulation power, enhances the scouring effect of the water flow on the flat sheet membrane surface, and reduces membrane fouling and scaling.

[0011] Furthermore, the through holes on the negative pressure suction tube are divided into three sections along its length: upper, middle, and lower, and the diameter of the through holes in the upper, middle, and lower sections increases sequentially.

[0012] Explanation: By using a gradient pore size design, the negative pressure intensity at different heights is balanced. The upper section of the through-hole is close to the snap-fit ​​cover, resulting in stronger negative pressure transmission and preventing excessive local suction that could cause membrane deformation. The lower section of the through-hole has relatively weaker negative pressure, so increasing the pore size can enhance suction efficiency and ensure uniform filtration across the entire height of the flat sheet membrane.

[0013] Furthermore, the upper end of the filter box is provided with a support mounting frame, the bottom end of the support mounting frame is provided with a horizontal slide rod driven by a rotary motor, and the outer wall of the horizontal slide rod is fitted with a winding roller corresponding to each of the fastening covers. The winding roller is movably connected to the upper end of the corresponding fastening cover by a winding rope.

[0014] Instructions: When it is necessary to clean or replace the negative pressure suction tube at the bottom of a snap-on cover, connect the free end of the winding rope to the upper end of the snap-on cover. The horizontal slide bar is driven to rotate by the rotary motor, which in turn drives the winding roller to rotate, so that the winding rope wraps around and pulls the corresponding snap-on cover out of the filter box. The mechanized lifting of the snap-on cover makes cleaning and replacing the negative pressure suction tube more efficient, safe and convenient.

[0015] Furthermore, the upper end of the fastening cover is provided with a metal plate, and the free end of the winding rope corresponding to the upper end of the fastening cover is provided with a connecting plate, and the bottom end of the connecting plate is provided with an electromagnetic chuck.

[0016] Instructions: When connecting the free end of the winding rope to the upper end of the fastening cover, power on the electromagnetic chuck. The electromagnetic chuck will attract the metal plate on the upper end of the corresponding fastening cover, achieving a quick connection. However, when separation is required, simply de-power the electromagnetic chuck. Only the power switch needs to be controlled, greatly simplifying the process.

[0017] The beneficial effects of this utility model are: In use, the negative pressure suction flat sheet membrane filtration device of this invention allows wastewater to be injected into the filter housing through the inlet. The negative pressure pump then quickly starts, creating a stable negative pressure environment below the snap-fit ​​cover. Under the powerful negative pressure suction, the water flow is driven to quickly pass through the membrane wall of the flat sheet membrane. Water molecules and solutes smaller than the membrane pore size can pass through smoothly, while large molecular pollutants such as suspended solids, colloids, and microorganisms are precisely retained. This efficient filtration and precise separation process enables rapid and deep purification of wastewater. Furthermore, the snap-fit ​​cover between adjacent flat sheet membranes, with the negative pressure suction pipe positioned at the bottom of the cover, ensures a stable negative pressure environment between adjacent membranes, reducing pressure loss during transmission and maintaining the set negative pressure intensity between each membrane, thus guaranteeing suction stability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is the utility model Figure 1 Enlarged view of point A in the image; Figure 3 This is a schematic diagram of the snap-on cover of the protective net cylinder of this utility model when it is not installed; Figure 4 This is a schematic diagram of the structure of the snap-on cover during the installation of the protective net cylinder of this utility model.

[0019] Among them, 1-filter box, 10-inlet, 11-outlet, 12-circulation pipe, 13-circulation pump, 14-flow control valve, 15-support mounting bracket, 150-rotary motor, 151-horizontal slide bar, 152-winding roller, 153-winding rope, 2-flat membrane, 3-negative pressure suction assembly, 30-negative pressure pump, 31-fastening cover, 310-protective net cylinder, 311-sealing airbag, 312-metal plate, 313-connecting plate, 314-electromagnetic chuck, 32-negative pressure suction pipe, 320-through hole, 33-negative pressure branch pipe, 34-negative pressure main pipe. Detailed Implementation

[0020] Example 1: As Figure 1 , 2 As shown, a negative pressure suction flat sheet membrane filtration device includes a filter box 1, four flat sheet membranes 2 disposed in the filter box 1, and a negative pressure suction assembly 3. The flat sheet membranes 2 adopt existing technology, such as UF-50k type flat sheet membranes. The filter box 1 has an inlet 10 and an outlet 11 on the left and right sides of its side wall, respectively; four flat sheet membranes 2 are distributed in parallel between the inlet 10 and the outlet 11. The negative pressure suction assembly 3 includes a negative pressure pump 30, a snap-fit ​​cover 31 that is movably snapped onto the upper end of the filter box 1 and located between two adjacent flat membranes 2, three negative pressure suction pipes 32 provided on each snap-fit ​​cover 31 and extending to the bottom end of the filter box 1, three negative pressure branch pipes 33 connected to each negative pressure suction pipe 32, and a negative pressure main pipe 34 connected to each negative pressure branch pipe 33. The negative pressure main pipe 34 is connected to the negative pressure pump 30. The side wall of the negative pressure suction pipe 32 is provided with nine through holes 320. The negative pressure pump 30 adopts existing technology, such as a VP-100V type negative pressure pump. The bottom of the snap-fit ​​cover 31 is provided with a protective mesh cylinder 310 corresponding to the periphery of each negative pressure suction pipe 32. A sealing airbag 311 is provided at the connection between the snap-fit ​​cover 31 and the filter box 1. The protective mesh cylinder 310 is mainly used to prevent large particles or suspended matter from directly entering the negative pressure suction pipe 32, avoiding blockage of the through hole 320 or damage to the negative pressure suction assembly. After inflation, the sealing airbag 311 forms an elastic seal to ensure the airtightness of the connection between the snap-fit ​​cover 31 and the filter box 1, prevent negative pressure leakage, maintain stable suction efficiency, and facilitate the installation and disassembly of the snap-fit ​​cover 31. The protective mesh cylinder 310 is made of galvanized low carbon steel wire, and the sealing airbag 311 can be an RDK15 / 30 type sealing airbag. A circulation pipe 12 is provided between the outlet 11 and the inlet 10. A circulation pump 13 and a flow control valve 14 are provided on the circulation pipe 12. The circulation pipe 12 allows some of the filtered water to flow back from the outlet 11 to the inlet 10, realizing the circulation filtration of water flow. The circulation pump 13 provides circulation power, enhances the scouring effect of water flow on the surface of the flat sheet membrane 2, and reduces membrane fouling and scaling. The circulation pump 13 and the flow control valve 14 both adopt existing technologies. For example, the circulation pump 13 can be a Wilo Atmos PICO25 / 8 type circulation pump, and the flow control valve 14 can be a Hengli 35F12-33 type flow control valve. like Figure 3 , 4 As shown, the through holes 320 on the negative pressure suction tube 32 are divided into three sections along its length: upper, middle, and lower. The diameter of the through holes 320 in the upper, middle, and lower sections increases sequentially. For example, in one implementation, the diameter of the through holes 320 in the upper section is 1.0 mm, the diameter of the through holes 320 in the middle section is 1.5 mm, and the diameter of the through holes 320 in the lower section is 2.0 mm. The gradient design of the through hole diameters 320 can balance the negative pressure intensity at different heights. The through holes 320 in the upper section are closer to the snap-fit ​​cover 31, resulting in stronger negative pressure transmission and preventing excessive local suction that could cause membrane deformation. The negative pressure in the through holes 320 in the lower section is relatively weak, and increasing the diameter can enhance suction efficiency and ensure uniform filtration across the entire height of the flat sheet membrane 2. The filter housing 1 is provided with a support mounting bracket 15 at the upper end. The support mounting bracket 15 is provided with a horizontal slide rod 151 driven by a rotary motor 150 at the bottom end. A winding roller 152 is sleeved on the outer wall of the horizontal slide rod 151 and corresponding to each snap-fit ​​cover 31. The winding roller 152 is movably connected to the upper end of the corresponding snap-fit ​​cover 31 through a winding rope 153. When it is necessary to clean or replace the negative pressure suction pipe 32 at the bottom of a snap-fit ​​cover 31, the free end of the winding rope 153 is connected to the upper end of the snap-fit ​​cover 31. The horizontal slide rod 151 is driven to rotate by the rotary motor 150, thereby driving the winding roller 152 to rotate, so that the winding rope 153 winds and drives the corresponding snap-fit ​​cover 31 to be pulled out from the filter housing 1. By mechanically lifting the snap-fit ​​cover 31, the cleaning and replacement of the negative pressure suction pipe 32 is more efficient, safe and convenient. The rotary motor 150 adopts existing technology, such as a Y80M1-2 type rotary motor. The upper end of the snap-fit ​​cover 31 is provided with a metal plate 312. The free end of the corresponding winding rope 153 at the upper end of the snap-fit ​​cover 31 is provided with a connecting plate 313. The bottom end of the connecting plate 313 is provided with an electromagnetic chuck 314. When the free end of the winding rope 153 is connected to the upper end of the snap-fit ​​cover 31, the electromagnetic chuck 314 is energized. The electromagnetic chuck 314 attracts the metal plate 312 at the upper end of the corresponding snap-fit ​​cover 31, achieving the purpose of quick connection. However, when separation is required, the power to the electromagnetic chuck 314 can be turned off. Only the power switch needs to be controlled, which greatly simplifies the process. The metal plate 312 can be any metal that can be magnetically attracted, such as pure iron or low carbon steel. The electromagnetic chuck 314 adopts existing technology, such as the Xm11 type electromagnetic chuck.

[0021] When using this negative pressure suction flat sheet membrane filtration equipment, the specific steps include: S1. Wastewater to be filtered is continuously injected into filter box 1 from the inlet 10 on the left side of filter box 1. S2. Start the negative pressure pump 30. The negative pressure pump 30 forms a stable negative pressure environment in the closed space under each snap-fit ​​cover 31 through the transmission of the negative pressure main pipe 34, negative pressure branch pipe 33 and each negative pressure suction pipe 32. S3. Under the suction of negative pressure, the water flow is driven through the membrane wall of the flat sheet membrane 2. Water molecules and solutes smaller than the membrane pore size can pass through, while suspended solids, colloids, microorganisms and other macromolecules are trapped on the surface of the flat sheet membrane 2 to form concentrated water. The negative pressure suction pipe 32 has three sections of through holes 320 with progressively larger pore sizes in the upper, middle and lower sections, which balances the negative pressure distribution along the length of the negative pressure suction pipe 32 and ensures that the filtration flux is uniform throughout the height of the flat sheet membrane 2. S4. The clear liquid passing through the flat membrane 2 enters the tube through the through hole 320 on the negative pressure suction tube 32, and then flows into the negative pressure branch tube 33 and the negative pressure main tube 34, and is finally collected and transported to external equipment. S5. Under the power provided by the circulating pump 13, the water flow in the filter box 1, including the concentrated water that has been intercepted and concentrated by the flat sheet membrane 2, is continuously pushed and discharged from the outlet 11 on the right side of the box. The discharged liquid is a high-concentration "concentrated water" or "concentrated liquid". Part of the concentrated water flows back to the inlet 10 through the circulating pipe 12 to participate in the circulation to maintain the membrane surface flushing flow rate, while the other part is guided to the subsequent treatment unit as the final concentrated waste liquid.

Claims

1. A negative pressure suction flat sheet membrane filtration device, characterized in that, Includes a filter box (1), several flat membranes (2) disposed inside the filter box (1), and a negative pressure suction assembly (3). The filter box (1) has an inlet (10) and an outlet (11) on the left and right sides of its side wall, respectively; several flat sheet membranes (2) are distributed in parallel between the inlet (10) and the outlet (11); The negative pressure suction assembly (3) includes a negative pressure pump (30), a snap-fit ​​cover (31) movably installed on the upper end of the filter box (1) and located between two adjacent flat membranes (2), several negative pressure suction pipes (32) provided on each of the snap-fit ​​covers (31) and extending to the bottom end of the filter box (1), several negative pressure branch pipes (33) connected to each of the negative pressure suction pipes (32), and a negative pressure main pipe (34) connected to each of the negative pressure branch pipes (33). The negative pressure main pipe (34) is connected to the negative pressure pump (30), and the side wall of the negative pressure suction pipe (32) is provided with several through holes (320).

2. The negative pressure suction flat sheet membrane filtration device according to claim 1, characterized in that, The bottom of the snap-on cover (31) is provided with a protective net tube (310) corresponding to the periphery of each negative pressure suction tube (32), and a sealing airbag (311) is provided at the connection between the snap-on cover (31) and the filter box (1).

3. The negative pressure suction flat sheet membrane filtration device according to claim 1, characterized in that, A circulation pipe (12) is provided between the outlet (11) and the inlet (10), and a circulation pump (13) and a flow control valve (14) are provided on the circulation pipe (12).

4. The negative pressure suction flat sheet membrane filtration device according to claim 1, characterized in that, The through holes (320) on the negative pressure suction tube (32) are divided into three sections along its length: upper, middle and lower, and the diameter of the through holes (320) in the upper, middle and lower sections increases sequentially.

5. The negative pressure suction flat sheet membrane filtration device according to claim 1, characterized in that, The filter box (1) is provided with a support mounting bracket (15) at the upper end. The support mounting bracket (15) is provided with a horizontal slide rod (151) driven by a rotary motor (150) at the bottom end. The outer wall of the horizontal slide rod (151) and corresponding to each of the snap-fit ​​covers (31) are fitted with a winding roller (152). The winding roller (152) is movably connected to the upper end of the corresponding snap-fit ​​cover (31) through a winding rope (153).

6. The negative pressure suction flat sheet membrane filtration device according to claim 5, characterized in that, The upper end of the fastening cover (31) is provided with a metal plate (312), and the free end of the winding rope (153) corresponding to the upper end of the fastening cover (31) is provided with a connecting plate (313), and the bottom end of the connecting plate (313) is provided with an electromagnetic chuck (314).

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