Multi-piece detachable flat sheet membrane assembly

Abstract

The utility model discloses a multi-piece detachable flat membrane assembly, which belongs to the technical field of environment-friendly sewage treatment equipment and structurally comprises a water collecting cavity, membrane units, inter-piece vertical plates, vertical pressing plates and internal thread nuts or transverse supporting strips, the membrane units are vertically arranged, the number of the membrane units is at least two, and the number of the water collecting cavities is two, and the water collecting cavities are vertically arranged at the left ends and the right ends of the membrane units. Due to the fact that the membrane units and the water collecting cavity are fixedly installed through the screws, the screws can be unscrewed during cleaning, the membrane units can be detached to be cleaned, the membrane units can be cleaned, and the manufacturing cost of the multi-piece detachable combined type flat membrane assembly is greatly reduced compared with that of a vertically-arranged hard plate flat membrane assembly. And compared with a multi-piece integrated soft sheet flat sheet membrane assembly, the membrane can be easily cleaned.

Description

TECHNICAL FIELD

[0001] The utility model relates to a flat membrane module belongs to the sewage treatment equipment technical field of environmental protection, especially a kind of multi-piece detachable flat membrane module applied in membrane bioreactor. BACKGROUND

[0002] At present, membrane bioreactor, namely MBR technology, is widely applied in sewage treatment, and the membrane bioreactor is a new type of wastewater treatment system combining membrane separation technology and biological treatment technology. The membrane module replaces the secondary sedimentation tank at the end of traditional biological treatment technology, and the flat membrane module is one of the most important membrane modules in the membrane bioreactor. The flat membrane module includes a flat membrane module, a membrane frame and an aeration pipe. The physical form of the flat membrane module is various, and the mainstream at present includes a vertical hard plate flat membrane module and a multi-piece integrated soft flat membrane module.

[0003] The vertical hard plate flat membrane module, as shown in Figure 9 , is composed of a vertical support plate with a thickness of 5 to 10 mm, a mesh and a membrane sheet. The support plate, also known as a flow guide plate, has longitudinal and transverse grooves on both sides for water flow. The mesh is composed of two pieces, which are arranged on both sides of the support plate. The membrane sheet is composed of two pieces, which are arranged on the outer side of the mesh and are welded or bonded to the support plate around. At least one water outlet is arranged on the top or side of the support plate. The water outlet is connected to the cavity formed in the middle of the two membrane sheets. During operation, the water that passes through the membrane sheet into the membrane module flows out through the water outlet.

[0004] During operation, as shown in Figure 11 , the membrane frame is arranged in a sewage tank. The membrane frame is composed of an upper horizontal pipe, a lower horizontal pipe and a vertical pipe. The upper horizontal pipe and the lower horizontal pipe are fixedly connected through the vertical pipe. The aeration pipe is arranged below the lower horizontal pipe and is connected to the aeration fan through a pipeline. The vertical hard plate flat membrane module is vertically installed between the upper horizontal pipe and the lower horizontal pipe of the membrane frame. The water outlet of the membrane module is connected to the water collecting pipe through a hose. One end of the water production pipe is connected to the liquid inlet of the water production pump, and the other end is connected to the water collecting pipe. One end of the clean water pipe is connected to the liquid outlet of the water production pump, and the other end is connected to the clean water tank. During water production, the aeration fan is started first. Air bubbles flow out of the through hole of the aeration pipe and contact the surface of the membrane sheet during the upward process, thereby removing the pollutants on the surface of the membrane sheet. Then, the water production pump is started. The pollutants in the sewage and water are separated at the membrane sheet through the negative pressure suction of the water production pump. The pollutants are intercepted outside the membrane sheet, and the water enters the inside of the membrane sheet and then flows into the water collecting pipe, the water production pump and the clean water pipe, and finally enters the clean water tank.

[0005] The multi-piece integrated soft flat membrane module, as shown in Figure 10 , is composed of a support plate, a mesh and a membrane sheet. The support plate is a flexible plate with a thickness of 0.5 to 1.5 mm. The mesh is composed of two pieces, which are arranged on both sides of the support plate. The membrane sheet is composed of two pieces, which are arranged on the outer side of the mesh and are bonded to the support plate around. At least one water outlet is arranged on the top or side of the support plate. The water outlet is connected to the cavity formed in the middle of the two membrane sheets. During operation, the membrane frame is arranged in a sewage tank. The membrane frame is composed of an upper horizontal pipe, a lower horizontal pipe and a vertical pipe. The upper horizontal pipe and the lower horizontal pipe are fixedly connected through the vertical pipe. The aeration pipe is arranged below the lower horizontal pipe and is connected to the aeration fan through a pipeline. The multi-piece integrated soft flat membrane module is vertically installed between the upper horizontal pipe and the lower horizontal pipe of the membrane frame. The water outlet of the membrane module is connected to the water collecting pipe through a hose. One end of the water production pipe is connected to the liquid inlet of the water production pump, and the other end is connected to the water collecting pipe. One end of the clean water pipe is connected to the liquid outlet of the water production pump, and the other end is connected to the clean water tank. During water production, the aeration fan is started first. Air bubbles flow out of the through hole of the aeration pipe and contact the surface of the membrane sheet during the upward process, thereby removing the pollutants on the surface of the membrane sheet. Then, the water production pump is started. The pollutants in the sewage and water are separated at the membrane sheet through the negative pressure suction of the water production pump. The pollutants are intercepted outside the membrane sheet, and the water enters the inside of the membrane sheet and then flows into the water collecting pipe, the water production pump and the clean water pipe, and finally enters the clean water tank.As shown: It consists of diaphragm units and water collection chambers. At least two diaphragm units are provided. The water collection chambers are vertically arranged at both ends of the diaphragm units. The diaphragm unit includes a support plate, a mesh, and diaphragms. The support plate is a flat plate with a thickness of 0.1 mm to 2 mm. There are two meshes, which are respectively arranged on both sides of the support plate. There are two diaphragms, which are respectively arranged on the outer side of the meshes. The edge of the diaphragm near the water collection chamber is connected to the water collection chamber by casting with epoxy resin or polyurethane adhesive. The other edges are connected to the support plate by welding or bonding. The cavity inside the diaphragm unit is connected to the cavity inside the water collection chamber. The outlet is located at the top of the water collection chamber. The product water pump is connected to the outlet of the water collection chamber through a pipe. During operation, water that passes through the diaphragm into the membrane module flows out through the outlet at the top of the water collection chamber.

[0006] The existing shortcomings of flat sheet membrane modules are:

[0007] The vertical rigid flat membrane module requires a 5-10 mm thick flat plate as the middle support plate, which is usually made of ABS plastic sheet. The material cost of the support plate accounts for about 40% of the cost of the membrane module. In order to maintain the support strength of the vertical rigid flat membrane module, this cost is difficult to reduce.

[0008] The support plate of the multi-piece integrated flexible flat sheet membrane module is a flat plate with a thickness of 0.1 mm to 2 mm, generally made of ABS plastic sheet. Due to the reduction in the thickness of the support plate, the manufacturing cost is reduced. However, the structure of the multi-piece integrated flexible flat sheet membrane module is that vertical water collection chambers are set at both ends, and multiple membrane units are connected to the water collection chambers side by side. This makes it easy for sludge to accumulate in the gaps between the membrane units during operation. Moreover, when the multi-piece integrated flexible flat sheet membrane module is removed from the sewage tank for cleaning of the membrane surface, the membrane units are fixed at both ends with very small gaps, making it difficult to clean the sludge, which can easily lead to incomplete cleaning and damage to the membranes. Summary of the Invention

[0009] To address the shortcomings of existing technologies, this invention provides a multi-piece detachable flat sheet membrane module. This membrane module equipment saves on manufacturing costs compared to vertical rigid flat sheet membrane modules and is easier to clean than multi-piece integrated flexible flat sheet membrane modules.

[0010] The technical solution of this utility model to solve the above problems is: a multi-piece detachable flat sheet membrane module, the structure of which includes a water collection cavity, membrane units, inter-piece vertical plates, vertical pressure plates, and internal thread nuts or horizontal support bars; the membrane units are vertically arranged, at least two are provided, and there are two water collection cavities, which are vertically arranged at the left and right ends of the membrane units. The water collection cavities include right-angled water collection cavities and T-shaped water collection cavities. One side of the outer side of the right-angled water collection cavity is the outer top edge, and the other side is the outer side edge, with the outer top edge and the outer side edge being set at a right angle. One side of the inner side of the right-angled water collection cavity is the inner top edge, and the other side is the inner side edge, with the inner top edge and the inner side edge being set at a right angle. The inside of the water collection cavity is a cavity. At least two water inlet holes are vertically arranged on the inner side of the right-angled water collection cavity. The water inlet holes communicate with the cavity inside the water collection cavity. An annular groove is provided on the outer side of the water inlet hole, and a sealing ring is provided in the annular groove. At least two water inlets are vertically arranged between the inner side edge and the outer side edge. There are through holes for screws, which are not connected to the internal cavity of the water collection chamber. A through hole for a horizontal support strip is provided between the inner top edge and the outer top edge. The outer edge of the T-shaped water collection chamber is the outer top edge, one inner left edge is the inner left top edge, one inner right edge is the inner right top edge, one edge perpendicular to the inner left top edge is the inner left side edge, and one edge perpendicular to the inner right top edge is the inner right side edge. At least two water inlet holes are vertically arranged on the inner left and inner right sides of the T-shaped water collection chamber. At least two through holes for screws are vertically arranged between the inner left and inner right sides. A through hole for a horizontal support strip is provided between the inner left top edge, inner right top edge, and outer top edge. This through hole for the horizontal support strip is not connected to the internal cavity of the water collection chamber. The outlet is located at the top of the water collection chamber. The diaphragm unit is divided into diaphragm units with support plates and diaphragm units without support plates. The diaphragm unit with support plates includes a support plate, a mesh, and a diaphragm, with a thickness of 0.The support plate is 1 mm to 2 mm thick. Two mesh panels are placed on opposite sides of the support plate, and two diaphragm panels are placed on the outer sides of the mesh panels. A diaphragm unit without the support plate includes a mesh panel and diaphragm panels. One mesh panel is placed in the middle, and two diaphragm panels are placed on the outer sides of the mesh panel. The diaphragm panels are sealed at their edges by welding or bonding. At least two water outlet holes and at least two through-holes are vertically arranged on the left and right sides of the diaphragm unit. The through-holes are sealed at their edges by welding or bonding. The inter-panel vertical plate is elongated, 3 mm to 10 mm thick, and 10 mm to 100 mm wide, vertically arranged between two diaphragm units. At least two through-holes and at least two water passage holes are vertically arranged on its top. An annular groove is provided on the outer side of the water passage holes. A sealing ring is installed within the groove; the vertical pressure plate is elongated, 3 mm to 10 mm thick, and 20 mm to 100 mm wide, vertically positioned outside the outermost diaphragm unit, with at least two through-holes for screws vertically on its surface. An annular groove is positioned corresponding to the water outlet hole of the diaphragm unit, and a sealing ring is installed within the annular groove; the screw rod passes through the through-holes in the water collection chamber, diaphragm unit, inter-diaphragm vertical plate, and vertical pressure plate, and is tightened with a nut to fix the positions of the water collection chamber, diaphragm unit, inter-diaphragm vertical plate, and vertical pressure plate; internally threaded nuts are located at the upper and lower parts of the outer top edge of the water collection chamber, and are fixedly connected to the membrane frame by screw rods; horizontal support bars are located on the upper and lower sides of the diaphragm unit, with external threads at both ends, passing through the through-holes in the horizontal support bars of the water collection chamber, and are fixedly connected to the water collection chamber by nuts.

[0011] Its beneficial effects are:

[0012] This utility model's multi-piece detachable flat sheet membrane module, due to the use of a support plate with a thickness of 0.1 mm to 2 mm or the use of membrane units without a support plate, significantly reduces the manufacturing cost compared to vertical rigid flat sheet membrane modules. Since the membrane units and the water collection chamber are fixedly installed with screws, the screws can be loosened during cleaning to disassemble the membrane units for cleaning, making it easier to clean the membranes than with multi-piece integrated flexible flat sheet membrane modules. Attached Figure Description

[0013] The present invention will be further described in conjunction with the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the front of the multi-piece detachable flat sheet membrane assembly of this utility model.

[0015] Figure 2 This is a schematic diagram of the membrane unit of the multi-piece detachable flat sheet membrane module of this utility model.

[0016] Figure 3 This is a schematic diagram of the right-angled water collection cavity of the multi-piece detachable flat sheet membrane module of this utility model, viewed from above.

[0017] Figure 4 This is a schematic diagram of the T-shaped water collection cavity of the multi-piece detachable flat sheet membrane module of this utility model, viewed from above.

[0018] Figure 5 This is a schematic diagram of the inner side of the water collection chamber of the multi-piece detachable flat sheet membrane module of this utility model, with the inner side facing outward.

[0019] Figure 6 This is a schematic diagram of the vertical plate between the sheets of the multi-sheet detachable flat film module of this utility model.

[0020] Figure 7 This is a schematic diagram of the vertical pressure plate of the multi-piece detachable flat film assembly of this utility model.

[0021] Figure 8 This is a schematic diagram of the operating state of the multi-piece detachable flat membrane module of this utility model installed on the membrane frame.

[0022] Figure 9 This is a schematic diagram of the front of a vertically mounted rigid flat sheet membrane module in the prior art, with the membrane sheet at the bottom of the front removed.

[0023] Figure 10 This is a schematic diagram of the front of a multi-piece integrated flexible flat sheet membrane assembly based on existing technology.

[0024] Figure 11 This is a schematic diagram of the operating status of a conventional flat-sheet membrane module.

[0025] In the diagram, 1 is the water collection chamber, 2 is the mesh, 3 is the support plate, 4 is the membrane, 5 is the upper horizontal pipe, 6 is the lower horizontal pipe, 7 is the vertical pipe, 8 is the aeration pipe, 9 is the vertical plate between the plates, 10 is the vertical pressure plate, 11 is the horizontal support bar, 12 is the internal thread nut, 13 is the product water pump, 14 is the outlet, 15 is the aeration blower, 16 is the sewage tank, 17 is the clear water tank, 18 is the product water pipe, 19 is the water collection pipe, 20 is the clear water pipe, 21 is the flexible hose, 22 is the nut, and 23 is the membrane. It is a vertical rigid flat sheet membrane module. 24 is a sealing ring, 25 is a membrane unit, 26 is a membrane frame, 27 is the outer top edge, 28 is the outer side edge, 29 is the inner top edge, 30 is the inner side edge, 31 is the water inlet hole, 32 is the annular groove, 33 is the water passage hole, 34 is the through screw hole, 35 is the water outlet hole, 36 is a multi-piece detachable flat sheet membrane module, 37 is the inner left top edge, 38 is the inner right top edge, 39 is the inner left side edge, and 40 is the inner right side edge. Detailed Implementation

[0026] A multi-piece detachable flat sheet membrane module, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 ,Figure 6 ， Figure 7As shown: Its structure includes a water collection cavity, diaphragm units, inter-diaphragm vertical plates, vertical pressure plates, and internal threaded nuts or horizontal support bars; the diaphragm units are vertically arranged, with at least two units; there are two water collection cavities, vertically arranged at the left and right ends of the diaphragm units; the water collection cavities include right-angled water collection cavities and T-shaped water collection cavities; one side of the outer side of the right-angled water collection cavity is the outer top edge, and the other side is the outer side edge, with the outer top edge and the outer side edge forming a right angle; one side of the inner side of the right-angled water collection cavity is the inner top edge, and the other side is the inner side edge, with the inner top edge and the inner side edge forming a right angle; the inside of the water collection cavity is a cavity; at least two water inlet holes are vertically arranged on the inner side of the right-angled water collection cavity, communicating with the cavity inside the water collection cavity; an annular groove is provided on the outer side of the water inlet hole, and a sealing ring is placed in the annular groove; at least two through-holes are vertically arranged between the inner and outer sides, and the through-holes are not connected to the cavity inside the water collection cavity. A through-hole for a horizontal support strip is provided between the inner top edge and the outer top edge. The outer edge of the T-shaped water collection cavity is the outer top edge, one inner left edge is the inner left top edge, one inner right edge is the inner right top edge, one edge perpendicular to the inner left top edge is the inner left side edge, and one edge perpendicular to the inner right top edge is the inner right side edge. At least two water inlet through-holes are vertically provided on the inner left and inner right sides of the T-shaped water collection cavity, and the water inlet through-holes are connected to the internal cavity of the water collection cavity. At least two through-holes for screws are vertically provided between the inner left and inner right sides. A through-hole for a horizontal support strip is provided between the inner left top edge, inner right top edge, and outer top edge, and the through-hole for the horizontal support strip is not connected to the internal cavity of the water collection cavity. The water outlet is located at the top of the water collection cavity. The diaphragm unit is divided into a diaphragm unit with a support plate and a diaphragm unit without a support plate. The diaphragm unit with a support plate includes a support plate, a mesh, and a diaphragm, with a thickness of 0.The support plate is 1 mm to 2 mm thick. Two mesh panels are placed on opposite sides of the support plate, and two diaphragm panels are placed on the outer sides of the mesh panels. A diaphragm unit without the support plate includes a mesh panel and diaphragm panels. One mesh panel is placed in the middle, and two diaphragm panels are placed on the outer sides of the mesh panel. The diaphragm panels are sealed at their edges by welding or bonding. At least two water outlet holes and at least two through-holes are vertically arranged on the left and right sides of the diaphragm unit. The through-holes are sealed at their edges by welding or bonding. The inter-panel vertical plate is elongated, 3 mm to 10 mm thick, and 10 mm to 100 mm wide, vertically arranged between two diaphragm units. At least two through-holes and at least two water passage holes are vertically arranged on its top. An annular groove is provided on the outer side of the water passage holes. A sealing ring is installed within the groove; the vertical pressure plate is elongated, 3 mm to 10 mm thick, and 20 mm to 100 mm wide, vertically positioned outside the outermost diaphragm unit, with at least two through-holes for screws vertically on its surface. An annular groove is positioned corresponding to the water outlet hole of the diaphragm unit, and a sealing ring is installed within the annular groove; the screw rod passes through the through-holes in the water collection chamber, diaphragm unit, inter-diaphragm vertical plate, and vertical pressure plate, and is tightened with a nut to fix the positions of the water collection chamber, diaphragm unit, inter-diaphragm vertical plate, and vertical pressure plate; internally threaded nuts are located at the upper and lower parts of the outer top edge of the water collection chamber, and are fixedly connected to the membrane frame by screw rods; horizontal support bars are located on the upper and lower sides of the diaphragm unit, with external threads at both ends, passing through the through-holes in the horizontal support bars of the water collection chamber, and are fixedly connected to the water collection chamber by nuts.

[0027] The principle and operation of this utility model's multi-piece detachable flat sheet membrane module are explained in detail below with reference to the accompanying drawings:

[0028] like Figure 8 As shown: The membrane frame is placed inside the sewage tank, and the aeration pipe is placed below the lower horizontal pipe and connected to the aeration blower through a pipe. The multi-piece detachable flat plate membrane module of this utility model is vertically installed between the upper and lower horizontal pipes of the membrane frame. The outlet of the membrane module is connected to the water collection pipe through a hose. The permeate pump is placed at the top of the sewage tank. One end of the permeate pipe is connected to the inlet of the permeate pump, and the other end is connected to the water collection pipe. One end of the clear water pipe is connected to the outlet of the permeate pump, and the other end is connected to the clear water tank. During water production, the aeration blower is started first. Air bubbles flow out through the through holes of the aeration pipe and come into contact with the membrane surface as they rise, carrying away the pollutants on the membrane surface. Then, the water production pump is started. Through the negative pressure suction of the water production pump, the pollutants in the wastewater are separated from the water at the membrane. The pollutants are trapped on the outside of the membrane, and the water enters the inside of the membrane. It enters the water passage of the vertical plate between the membrane through the water outlet holes on the membrane, and then enters the cavity inside the water collection chamber through the water inlet holes of the water collection chamber. Then, it flows from the water outlet of the water collection chamber into the water collection pipe, the water production pipe, the water production pump and the clear water pipe through the hose, and finally enters the clear water tank.

[0029] Membrane modules are generally operated intermittently, that is, the permeate pump is started to draw water under negative pressure for 8 minutes, the permeate pump is stopped for 2 minutes, and the aeration blower is run continuously.

[0030] Because of the use of a support plate with a thickness of 0.1 mm to 2 mm or the use of membrane units without a support plate, the manufacturing cost of the multi-piece detachable flat sheet membrane module of this utility model is significantly reduced compared with the vertical rigid plate flat sheet membrane module. After a period of operation, sludge blockage may occur between the membrane units of the multi-piece detachable flat sheet membrane module of this utility model. It is necessary to remove the multi-piece detachable flat sheet membrane module of this utility model from the sewage tank or membrane tank for cleaning. At this time, the nut on the water collection chamber can be loosened, the screw rod in the through screw hole can be removed, and all the membrane units can be removed and cleaned one by one. After cleaning, they can be reinstalled in their original state. This cleaning method makes it easier to clean the membranes than the multi-piece integrated flexible flat sheet membrane module.

[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A multi-piece detachable flat sheet membrane module, an improvement on the flat sheet membrane module, mainly composed of a support plate, a mesh sheet, and a membrane sheet, characterized in that: Its structure includes a water collection cavity, diaphragm units, inter-diaphragm vertical plates, vertical pressure plates, and internal threaded nuts or horizontal support bars. At least two diaphragm units are vertically arranged, and there are two water collection cavities, vertically arranged at the left and right ends of the diaphragm units. The water collection cavities include right-angled and T-shaped water collection cavities. One side of the outer edge of the right-angled water collection cavity is the outer top edge, and the other side is the outer side edge, with the outer top edge and outer side edge forming a right angle. One side of the inner edge of the right-angled water collection cavity is the inner top edge, and the other side is the inner side edge, with the inner top edge and inner side edge forming a right angle. The inside of the water collection cavity is a cavity. At least two water inlet holes are vertically arranged on the inner side of the right-angled water collection cavity, communicating with the cavity inside. An annular groove is provided on the outer side of the water inlet hole, and a sealing ring is placed inside the annular groove. At least two through-holes are vertically arranged between the inner and outer sides, and these through-holes communicate with the water collection cavity. The internal cavities are not interconnected. A through-hole for a horizontal support strip is provided between the inner top edge and the outer top edge. The outer edge of the T-shaped water collection cavity is the outer top edge, one inner left edge is the inner left top edge, one inner right edge is the inner right top edge, one edge perpendicular to the inner left top edge is the inner left side edge, and one edge perpendicular to the inner right top edge is the inner right side edge. At least two water inlet holes are vertically arranged on the inner left and inner right sides of the T-shaped water collection cavity. At least two through-holes for screws are vertically arranged between the inner left and inner right sides. A through-hole for a horizontal support strip is provided between the inner left top edge, inner right top edge, and outer top edge. This through-hole is not connected to the internal cavity of the water collection cavity. The outlet is located at the top of the water collection cavity. The diaphragm unit is divided into a diaphragm unit with a support plate and a diaphragm unit without a support plate. The diaphragm unit with a support plate includes a support plate, a mesh, and a diaphragm, with a thickness of 0.The support plate is 1 mm to 2 mm thick. Two mesh panels are placed on opposite sides of the support plate, and two diaphragm panels are placed on the outer sides of the mesh panels. A diaphragm unit without the support plate includes a mesh panel and diaphragm panels. One mesh panel is placed in the middle, and two diaphragm panels are placed on the outer sides of the mesh panel. The diaphragm panels are sealed at their edges by welding or bonding. At least two water outlet holes and at least two through-holes are vertically arranged on the left and right sides of the diaphragm unit. The through-holes are sealed at their edges by welding or bonding. The inter-panel vertical plate is elongated, 3 mm to 10 mm thick, and 10 mm to 100 mm wide, vertically arranged between two diaphragm units. At least two through-holes and at least two water passage holes are vertically arranged on its top. An annular groove is provided on the outer side of the water passage holes. A sealing ring is installed within the groove; the vertical pressure plate is elongated, 3 mm to 10 mm thick, and 20 mm to 100 mm wide, vertically positioned outside the outermost diaphragm unit, with at least two through-holes for screws vertically on its surface. An annular groove is positioned corresponding to the water outlet hole of the diaphragm unit, and a sealing ring is installed within the annular groove; the screw rod passes through the through-holes in the water collection chamber, diaphragm unit, inter-diaphragm vertical plate, and vertical pressure plate, and is tightened with a nut to fix the positions of the water collection chamber, diaphragm unit, inter-diaphragm vertical plate, and vertical pressure plate; internally threaded nuts are located at the upper and lower parts of the outer top edge of the water collection chamber, and are fixedly connected to the membrane frame by screw rods; horizontal support bars are located on the upper and lower sides of the diaphragm unit, with external threads at both ends, passing through the through-holes in the horizontal support bars of the water collection chamber, and are fixedly connected to the water collection chamber by nuts.

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