CN216986452U - Porous auxiliary flow guide type diaphragm accessory for discharging filtrate at four corners of diaphragm filter plate - Google Patents

Abstract

The utility model relates to a porous auxiliary flow guide type diaphragm accessory for discharging filtrate at four corners of a diaphragm filter plate, which has the key points of the innovative scheme that: the diaphragm accessories are additionally arranged on the basis of the existing rubber diaphragm, namely a plurality of rows of flow guide bent hole type plastic embedding blocks, meanwhile, corresponding vacant positions of the diaphragm accessories are dug out on the four corners of the diaphragm, the diaphragm accessories are embedded into the vacant positions of the four corners of the diaphragm and fixed on a filter plate core, the diaphragm accessories are improved to replace the functions of the existing diaphragm flow guide hole arranging part, a diaphragm liquid flow network and a core plate converging hole, and filtrate in the diaphragm liquid flow network can be quickly led out to the core plate converging hole; the plastic membrane accessory has simple structure, easy processing, difficult deformation, smooth liquid outlet and durability; the technical problems that the rubber diaphragm is difficult to process due to special materials and limited thickness, four corners of the rubber diaphragm are bent, the rubber diaphragm is easy to age and deform after a long time, four corners of the rubber diaphragm are easy to fall off, or the guide discharge holes are easy to twist, so that the guide discharge holes are not smooth, the liquid outlet performance is poor, and the efficiency is low are solved; quality improvement and efficiency improvement.

Description

Porous auxiliary flow guide type diaphragm accessory for discharging filtrate at four corners of diaphragm filter plate

Technical Field

The utility model belongs to the technical field of membrane filter presses (patent classification number B01D 25/12), and relates to a porous flow guide type membrane sheet accessory for helping a membrane filter plate to discharge filtrate.

Background

The filter press is a pressurized filtering device with multiple filtering chambers operated intermittently; the membrane filter press is a filter press for dewatering filter cakes by primary low-pressure static filtration and secondary high-pressure (the highest filtration pressure is 4.5 MPa) swelling membrane pressing; the device mainly comprises a double-beam frame, a filter plate pressing mechanism, a squeezing and filtering mechanism, a plate pulling and cake unloading mechanism, a filter cloth cleaning mechanism, a turning plate liquid receiving mechanism and a PLC program control system. The working principle and the process of the membrane filter press are as follows: the feed delivery pump inputs the solid-liquid mixed material into each filtering chamber from the feed port, so that pressure difference is formed between two sides of the filtering cloth, low-pressure static filtering is carried out, particles in the material are intercepted by the filtering cloth to form a filtering cake in the filtering chamber, and the filtrate passes through the filtering cloth and flows out from the liquid outlet hole; secondly, the diaphragm is expanded by the high pressure to squeeze the filter cake for dehydration (the water content of the filter cake can be further reduced by 5-13%); the filter plate is pulled open to realize gravity cake unloading; the method is suitable for the pressurized solid-liquid separation of various suspension materials (namely the mixture of liquid and solid particles) with low water content of filter cakes.

The squeezing and filtering mechanism is a core mechanism of a diaphragm filter press and mainly comprises an anti-corrosion filter plate sealed from head to tail, a combined filter plate (comprising a diaphragm filter plate and a matched filter plate), filter cloth, a cloth clamping distributor, a filter plate support handle, sealing rings at inlet and outlet hole ends of each fluid and external pipelines for inlet and outlet of each fluid; the combined filter plate (a plurality of diaphragm filter plates, filter cloth and matched filter plates are arranged alternately) is supported on the filter plate slide ways of the two beams of the frame by the double-filter-plate supporting handle, the filter plates are pressed by a hydraulic oil cylinder of the filter plate pressing mechanism, and a plurality of concave parts (cavity parts) of adjacent filter plates coated with the filter cloth form a plurality of pressing filter chambers; the multi-squeezing filtering chambers are provided with anti-corrosion filtering plates sealed end to end and external pipelines for the fluid to enter and exit to form a squeezing filtering mechanism.

The double-sided structure of the membrane filter plate is symmetrical, is a key element of a squeezing and filtering mechanism and comprises a filter plate core and a membrane sheet; taking the middle ear feeding four-corner liquid outlet diaphragm filter plate as an example, the filter plate core is a four-corner liquid outlet plastic filter plate core and is provided with a flow guide row hole (namely a row of flow guide bent holes penetrating through the intersection of a membrane and a confluence hole), a core plate confluence hole, a core plate liquid outlet hole, a high-pressure medium hole, a feeding hole, a filter plate pressure bearing table (also used as a filter cloth support), a cavity part and a frame sealing surface; the diaphragm sheet is a rubber diaphragm sheet with four corners discharging liquid, is provided with a flow guide discharge hole, a feed hole and a liquid flow network, and the specification of the main body of the diaphragm sheet corresponds to the cavity part of the filter plate core; utilize the screw, the filtration site of two diaphragm pieces is outwards installed respectively on filter plate core two sides, forms the diaphragm filter plate, and the diaphragm piece constitutes the high pressure medium chamber with the cavity portion of filter plate core, and the liquid hole UNICOM of polylith diaphragm filter plate and supporting filter plate becomes dark effluent liquid channel. The liquid outlet (filtrate discharge) path of the membrane filter plate is as follows: filter cloth → membrane liquid flow network → membrane diversion discharge hole → core plate confluence hole → core plate liquid outlet hole → dark effluent liquid channel.

The existing four-corner liquid discharge type rubber diaphragm has the following defects: (1) the processing difficulty of the flow guide row holes is high, and because the flow guide row holes are a row of flow guide bent holes penetrating through the intersection of the diaphragm and the confluence holes, and the thickness of the diaphragm is limited, the processing difficulty of the flow guide row holes with four bent corners is high; the membrane sheet and the filter plate core are assembled and then flow guide row holes are processed, but the membrane sheet and the filter plate core are different in material, so that the flow guide row holes at four corners are more difficult to process; (2) the flow guide discharge holes are not smooth, and the rubber diaphragm is easy to age and deform, and four corners of the diaphragm are easy to fall off after a long time, so that the flow guide discharge holes are distorted, the flow guide discharge holes are not smooth, and the liquid outlet efficiency and the production efficiency are influenced; the replacement of the diaphragm also needs shutdown and error production; the improvement of the liquid outlet performance of the rubber diaphragm is a technical problem which is expected to be solved but is not successful all the time.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the existing four-corner liquid discharge type rubber diaphragm, solve the technical problems that the rubber diaphragm is easy to age and deform for a long time, the four corners of the rubber diaphragm are easy to fall off or the flow guide discharge holes are easy to distort, so that the flow guide discharge holes are not smooth, the liquid discharge performance is poor and the efficiency is low due to the fact that the rubber diaphragm is made of special materials and has limited thickness and four-corner bending, and provide the porous auxiliary flow guide type diaphragm accessory for discharging filtrate at the four corners of the diaphragm filter plate.

The utility model adopts a brand-new technical scheme for solving the problems of the prior art, which comprises the following steps: a porous auxiliary diversion type diaphragm accessory (hereinafter referred to as diaphragm accessory) for discharging filtrate at four corners of a diaphragm filter plate; the main point of the general technical scheme is that compared with the prior art, the innovative general structure has the prominent substantive characteristics that: on the basis of the existing four-corner liquid outlet type rubber diaphragm, a multi-hole auxiliary flow guide type diaphragm accessory is additionally arranged, namely a multi-row flow guide hole discharging type plastic embedded block at four corners of the diaphragm is dug out, corresponding vacant positions of the diaphragm accessory are dug out on the four corners of the diaphragm, the diaphragm accessory is embedded into the vacant positions at the four corners of the diaphragm and fixed on a filter plate core, the flow guide hole discharging improvement of the diaphragm accessory replaces the flow guide hole discharging of the existing diaphragm, a liquid flow network for communicating the diaphragm and a core plate collecting hole of the filter plate core, and filtrate in the liquid flow network of the diaphragm can be quickly led out to the core plate collecting hole; the plastic diaphragm accessory has simple structure, easy processing, difficult deformation, smooth liquid outlet and durability; therefore, the technical problems that the rubber diaphragm is easy to age and deform after a long time, four corners of the rubber diaphragm are easy to fall off or the flow guide discharge holes are easy to twist, the flow guide discharge holes are unsmooth, the liquid outlet performance is poor and the efficiency is low are solved.

The specific design scheme of the utility model is as follows: the diaphragm accessory comprises a porous arc insertion strip and a porous flat plate which are integrally molded by injection; (1) the vertical direction of the multi-hole arc insertion strip is provided with a plurality of auxiliary flow guide row holes II (short for flow guide row holes II), the middle of the multi-hole arc insertion strip is provided with a connecting plate core hole, the arc of the insertion strip is the same as the arc of the four corners of the diaphragm, and the length of the insertion strip is equal to that of the multi-hole flat plate; (2) the multi-hole flat plate is a single-side arc multi-hole flat plate, a plurality of auxiliary flow guide row holes I (flow guide row holes I for short) are arranged in the horizontal direction of the flat plate, the specification of the multi-hole flat plate corresponds to the structural size of the flow guide row holes at four corners of the existing diaphragm, the thickness of the multi-hole flat plate is smaller than that of the diaphragm, and the flow guide row holes I and the flow guide row holes II are in one-to-one correspondence and are mutually communicated; (3) related adaptation improvements: digging vacant sites corresponding to the porous flat plates attached to the diaphragm sheet on four corners of the diaphragm sheet, wherein the width of the vacant sites on the four corners of the diaphragm sheet is larger than that of the porous flat plates, so that a straight long side of each porous flat plate and the inner side of the diaphragm sheet form a separated filtrate tank, and the separated filtrate tanks are communicated with a flow guide discharge hole I; arc grooves corresponding to the multi-hole arc insertion strips of the diaphragm accessories are dug on the four corners of the core plate, and the arc grooves are communicated with the core plate confluence holes.

The connection relation of the utility model is as follows: the four membrane sheet accessories are respectively embedded in the four corners of the membrane filter plate, and the membrane sheet accessories are flush with the surfaces of the membrane sheets, wherein the porous arc insertion strips are embedded in the arc grooves of the four corners of the core plate, the porous flat plate is embedded in the vacant positions of the four corners of the membrane sheets and compresses the four corners of the membrane sheets to prevent the four corners of the membrane sheets from falling off for a long time, and the membrane sheet accessories are fixed on the core plate by screws; the flow guide discharge hole of the diaphragm accessory is communicated with the flow network of the diaphragm and the core plate flow collecting hole, so that the function of replacing the existing flow guide discharge hole part of the diaphragm can be improved, and the filtrate in the flow network of the diaphragm can be quickly led out to the core plate flow collecting hole; the membrane sheet accessory has the functions of quickly guiding the liquid out of the membrane filter plate and fastening the four corners of the membrane sheet, thereby achieving two purposes.

The porous auxiliary flow guide type diaphragm accessory for discharging the filtrate at the four corners of the diaphragm filter plate has the obvious advantages of simple structure, easy processing, difficult deformation, smooth liquid discharge, difficult shedding of the four corners of the diaphragm, durability and reliable quality; the multi-hole auxiliary flow guiding type diaphragm accessory is additionally arranged, and the flow guiding and discharging holes of the diaphragm accessory are improved to replace the flow guiding and discharging holes of the existing diaphragm, a liquid flow network communicated with the diaphragm and a core plate converging hole, so that the diaphragm filter plate can smoothly discharge liquid without obstruction, and the service life of the diaphragm is prolonged; the technical problem that people are eagerly to solve but can not successfully improve the liquid outlet performance and the liquid outlet efficiency of the rubber diaphragm all the time is solved; upgrading and replacing products, and improving quality and efficiency.

Drawings

Fig. 1 is a perspective view of the porous auxiliary flow guide type diaphragm accessory of the present invention.

Fig. 2 is a front view of the porous auxiliary flow-guide type diaphragm attachment of the present invention.

Fig. 3 is an assembly schematic diagram of a diaphragm filter plate corresponding to the multi-hole auxiliary flow guide type diaphragm accessory of the utility model.

Fig. 4 is a schematic cross-sectional view of a part of a diagonal corner (i.e., an upper corner) of a membrane filter plate corresponding to the porous auxiliary flow-guide type membrane sheet accessory.

Reference numerals: 1-porous auxiliary flow guide type diaphragm sheet accessory (short for diaphragm sheet accessory or the utility model) for discharging filtrate at four corners of a diaphragm filter plate, 2-rubber diaphragm sheet (short for diaphragm sheet), 3-filter plate core (short for core plate), 4-flow guide row holes (a row of flow guide bent holes penetrating through the intersection of the diaphragm and a confluence hole), 5-core plate confluence holes, 6-core plate liquid outlet holes, 7-high-pressure medium holes, 8-screws, 9-feed holes, 10-filter plate pressure bearing table (supporting by filter cloth), 11-porous arc filler rod, 12-auxiliary flow guide row holes II (short for flow guide row holes II), 13-porous flat plate, 14-auxiliary flow guide row holes I (short for flow guide row holes I) and 15-connecting plate core holes.

Detailed Description

The technical solution in the embodiment of the present invention is described below with reference to the accompanying drawings in the embodiment of the present invention, in which the porous auxiliary diversion type membrane sheet attachment for discharging filtrate at four corners of a membrane filter plate is only a preferred part of the embodiment of the present invention, and not all of the embodiments are described. All other embodiments, such as membrane diversion accessories with the same multi-hole auxiliary diversion mode and similar structures, which are not inventive by the technical personnel in the field, belong to the protection scope of the utility model.

Example 1

A porous auxiliary flow guide type diaphragm accessory 1 (a diaphragm accessory for short) for discharging filtrate at four corners of a diaphragm filter plate; the main points of the overall embodiment of the innovation are: on the basis of the existing rubber diaphragm with four liquid-out corners, a multi-hole auxiliary flow-guiding type diaphragm accessory 1 is additionally arranged, namely a multi-row flow-guiding hole-discharging type plastic insert block at four corners of the diaphragm comprises a multi-hole arc insert strip 11 and a multi-hole flat plate 13 which are integrally formed by injection molding; meanwhile, corresponding vacant sites of the membrane sheet accessories 1 are dug on the four corners of the membrane sheet 2, the membrane sheet accessories 1 are embedded into the vacant sites of the four corners of the membrane sheet 2 and are fixed on the filter plate core 3, the flow guide row holes 4 (including flow guide row holes I and II) of the membrane sheet accessories 1 are improved to replace the existing flow guide row holes 4 of the membrane sheet, a liquid flow network communicated with the membrane sheet 2 and a core plate convergence hole 5 of the filter plate core 3, and filtrate in the liquid flow network of the membrane sheet 2 can be quickly led out to the core plate convergence hole 5; the plastic diaphragm accessory 1 has simple structure, easy processing, difficult deformation, smooth liquid outlet and durability; specific embodiments are described in detail below.

The vertical direction of the multi-hole arc insertion strip 11 is provided with a plurality of auxiliary flow guide row holes II 12 (called flow guide row holes II for short), the middle of the multi-hole arc insertion strip is provided with a connecting plate core hole 15, the arc of the insertion strip is the same as the arc of four corners of the diaphragm 2, and the length of the insertion strip is equal to that of the multi-hole flat plate 13; the guide row holes II 12 and the guide row holes I14 are in one-to-one correspondence and are communicated with each other; the diaphragm plate is used for communicating the flow guide row holes II 12 with the core plate converging hole 5, filtrate is guided out to the core plate converging hole 5 by the flow guide row holes II 12 continuously, and the diaphragm plate accessories 1 are embedded at four corners of the core plate 3.

The multi-hole flat plate 13 is a single-side arc multi-hole flat plate 13, a plurality of auxiliary flow guide row holes I14 (flow guide row holes I for short) are arranged in the horizontal direction of the flat plate, the specification of the multi-hole flat plate corresponds to the structure size of the flow guide row holes 4 at four corners of the existing diaphragm 2, the thickness of the multi-hole flat plate is smaller than that of the diaphragm 2, and the flow guide row holes I14 and the flow guide row holes II 12 are in one-to-one correspondence and are mutually communicated; the filter membrane is used for guiding filtrate in a liquid flow network of the membrane 2 out to the flow guide discharge hole I14, and pressing four corners of the membrane 2 to prevent the four corners of the membrane 2 from falling off for a long time.

Related adaptation improvements: (1) vacant sites corresponding to the porous flat plates 13 of the membrane sheet accessories 1 are dug on the four corners of the membrane sheet 2, the width of the vacant sites at the four corners of the membrane sheet is larger than that of the porous flat plates 13, so that the straight long sides of the porous flat plates 13 and the inner sides of the membrane sheet 2 form a spaced filtrate tank, and the spaced filtrate tank is communicated with a flow guide discharge hole I14; the vacant sites at the four corners of the diaphragm are used for embedding the porous flat plate 13 part of the diaphragm accessory 1, and forming a spaced filter solution tank, so that the flow guide discharge holes I14 of the diaphragm accessory 1 are communicated with the spaced filter solution tank and a liquid flow network, and the surface of the diaphragm accessory 1 is ensured to be flush with the surface of the diaphragm 2; (2) arc grooves corresponding to the multi-hole arc insertion strips 11 of the diaphragm accessories 1 are dug on the four corners of the core plate 3, and the arc grooves are communicated with the core plate confluence holes 5; the part of the porous arc fillet 11 used for embedding the diaphragm accessory 1 leads the flow guide row holes II 12 of the diaphragm accessory 1 to be communicated with the core plate confluence hole 5.

The connection relationship of the membrane sheet accessory 1 is as follows: the four diaphragm sheet accessories 1 are respectively embedded at four corners of the diaphragm filter plate, the diaphragm sheet accessories 1 are flush with the surfaces of the diaphragm sheets 2, wherein the porous arc insertion strips 11 are embedded in arc-shaped grooves at the four corners of the core plate 3, the porous flat plates 13 are embedded in vacant positions at the four corners of the diaphragm sheets 2 and press the four corners of the diaphragm sheets 2 tightly, so that the four corners of the diaphragm sheets 2 are prevented from falling off for a long time, and the diaphragm sheet accessories 1 are fixed on the core plate 3 by screws; the flow guide and discharge holes of the diaphragm accessory 1 are communicated with the liquid flow network of the diaphragm 2 and the core plate convergence hole 5, so that filtrate can be quickly led out; the diaphragm accessory 1 has the functions of quickly guiding the liquid out of the diaphragm filter plate and fastening four corners of the diaphragm 2, thereby achieving two purposes.

The multi-hole auxiliary flow guide type diaphragm accessory 1 for discharging the filtrate at the four corners of the diaphragm filter plate has the obvious advantages of simple structure, easy processing, difficult deformation, smooth liquid outlet, difficult falling of the four corners of the diaphragm, durability and reliable quality; the technical problems that the rubber diaphragm 2 is easy to age and deform after long time, four corners of the rubber diaphragm are easy to fall off or the flow guide discharge holes 4 are easy to distort, so that the flow guide discharge holes 4 are not smooth, the liquid outlet performance is poor and the efficiency is low are solved, and all the service lives of the diaphragm 2 are prolonged; the product is upgraded and updated, and the quality and the efficiency are improved.

Example 2

A kind of diaphragm filter plate, namely the upper middle ear feeds the liquid type diaphragm filter plate of four corners, it is the key element which squeezes the filtering mechanism, use the diaphragm filter plate four corners provided by this invention to discharge the porous auxiliary flow guiding type diaphragm attachment 1 (abbreviate for the diaphragm attachment) used for filtrate; the diaphragm filter plate has a symmetrical double-sided structure and mainly comprises a filter plate core 3 (a core plate for short), a rubber diaphragm 2 (a diaphragm for short) and a diaphragm accessory 1; the diaphragm filter plate is combined with a matched filter plate and covers filter cloth to form a squeezing filter chamber, and the squeezing filter chamber has the functions of primary low-pressure static filtration and secondary high-pressure (the highest filtration pressure is 4.5 MPa) swelling diaphragm squeezing filter cake dehydration. The utility model shares the technical part with the prior art, according to the current standard of China' Van filter press and plate-and-frame filter press part 1: type and basic parameters section 2: technical Condition section 3: filter plates (section 4: membrane Filter plates (JB/T4333).

The filter plate core 3 is a plastic filter plate core 3 with four liquid outlet corners and is provided with a core plate confluence hole 5, a core plate liquid outlet hole 6, a high-pressure medium hole 7, a feed hole 9, a filter plate pressure bearing table 10 (which is also supported by filter cloth), a cavity part (namely a concave part), a frame sealing surface and accessory embedding grooves (namely arc-shaped grooves at the four corners of the filter plate core); the filter plate is mainly used for enabling the cavity part and the diaphragm 2 to form a high-pressure medium cavity and forming a filter chamber with the cavity part of the adjacent filter plate.

The diaphragm 2 is a rubber diaphragm 2 with four corners discharging liquid, and is provided with a feeding hole 9, a liquid flow network (a filter screen surface) and an accessory embedding seat (namely vacant positions at four corners of the diaphragm), and the specification of the main body of the diaphragm 2 corresponds to that of the cavity part of the filter plate core 3; the method is mainly used for secondary pressurization (the highest filtering pressure is 4.5 MPa), so that the diaphragm 2 is expanded to squeeze a filter cake for dehydration, and the filter cloth and the filtrate are supported and guided.

The diaphragm accessory 1 comprises a porous arc insertion strip 11 and a porous flat plate 13 which are integrally formed by injection molding; the guide flow row holes 4 are provided with a plurality of bent guide flow row holes and comprise guide flow row holes I14 and guide flow row holes II 12, and the guide flow row holes I14 and the guide flow row holes II 12 are in one-to-one correspondence and are mutually communicated; the diaphragm is mainly used for improving the function of replacing the existing flow guide and discharge hole 4 part of the diaphragm 2, guiding filtrate in a liquid flow network of the diaphragm 2 to the core plate confluence hole 5, pressing four corners of the diaphragm 2 and avoiding the falling of the four corners of the diaphragm 2 for a long time.

Assembling the diaphragm filter plate: by using the screws 8, the filter screen surfaces of the double-diaphragm sheets 2 face outwards and are respectively arranged on the two surfaces of the filter plate core 3, and the diaphragm sheets 2 and the cavity part of the filter plate core 3 form a high-pressure medium cavity; the four diaphragm accessories 1 are respectively embedded at four corners of the diaphragm filter plate, the diaphragm accessories 1 are fixed on the core plate 3 by screws, and the diaphragm accessories 1 are flush with the surface of the diaphragm 2; the porous arc insertion strip 11 is embedded into the accessory embedding grooves at four corners of the core plate 3, and the porous flat plate 13 is embedded into the accessory embedding seats at four corners of the diaphragm 2 and tightly presses the four corners of the diaphragm 2; the flow guide discharge hole 4 of the diaphragm accessory 1 is communicated with the flow network of the diaphragm 2 and the core plate convergence hole 5, and filtrate can be quickly led out to the core plate convergence hole 5. The plurality of diaphragm filter plates are communicated with the liquid outlet holes 6 of the matched filter plates to form a dark liquid outlet channel; the liquid outlet (filtrate discharge) path of the membrane filter plate is as follows: the filter cloth → the diaphragm 2 liquid flow network → the diaphragm flow guide discharge hole 4 → the core plate confluence hole 5 → the core plate liquid outlet hole 6 → the dark liquid outlet channel.

The diaphragm filter plate has the advantages that the porous auxiliary flow guide type diaphragm attachment 1 is additionally arranged, and the flow guide discharge holes 4 of the diaphragm attachment 1 are improved to replace the existing flow guide discharge holes of the diaphragm, a liquid flow network communicated with the diaphragm 2 and a core plate confluence hole 5, so that the diaphragm filter plate can smoothly discharge liquid without blockage, and all the service lives of the diaphragm 2 are prolonged; the technical problem that people are eagerly to solve but can not successfully improve the liquid outlet performance and the liquid outlet efficiency of the rubber diaphragm 2 all the time is solved; upgrading and replacing products, and improving quality and efficiency.

Claims (1)

1. A porous auxiliary flow guide type diaphragm accessory for discharging filtrate at four corners of a diaphragm filter plate comprises a porous arc insertion strip and a porous flat plate which are integrally formed by injection molding; the method is characterized in that: the vertical direction of the multi-hole arc insertion strip is provided with a plurality of auxiliary flow guide row holes II, the middle of the multi-hole arc insertion strip is provided with a connecting plate core hole, the arc of the insertion strip is the same as the arc of four corners of the diaphragm, and the length of the insertion strip is equal to that of the multi-hole flat plate; the multi-hole flat plate is a single-side arc multi-hole flat plate, a plurality of auxiliary flow guide row holes I are arranged in the horizontal direction of the flat plate, the specification of the multi-hole flat plate corresponds to the structural size of the flow guide row holes at four corners of the existing diaphragm, the thickness of the multi-hole flat plate is smaller than that of the diaphragm, and the flow guide row holes I and the flow guide row holes II are in one-to-one correspondence and are communicated with each other; the adaptability of the diaphragm and the core plate is improved: digging vacant sites corresponding to the porous flat plates attached to the diaphragm sheet on four corners of the diaphragm sheet, wherein the width of the vacant sites on the four corners of the diaphragm sheet is larger than that of the porous flat plates, so that a straight long side of each porous flat plate and the inner side of the diaphragm sheet form a separated filtrate tank, and the separated filtrate tanks are communicated with a flow guide discharge hole I; arc grooves corresponding to the multi-hole arc insertion strips of the diaphragm accessories are dug on the four corners of the core plate, and the arc grooves are communicated with the core plate confluence holes; the connection relation of the membrane sheet accessory is as follows: the four membrane sheet accessories are respectively embedded at the four corners of the membrane filter plate, and the membrane sheet accessories are flush with the surfaces of the membrane sheets, wherein the porous arc insertion strips are embedded in the arc-shaped grooves at the four corners of the core plate, the porous flat plates are embedded in the vacant positions at the four corners of the membrane sheets and press the four corners of the membrane sheets to prevent the membrane sheets from falling off, and the membrane sheet accessories are fixed on the core plate by screws; the flow guide discharge hole of the diaphragm accessory is communicated with the flow network of the diaphragm and the flow converging hole of the core plate, and filtrate in the flow network of the diaphragm can be guided out to the flow converging hole of the core plate.

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