Filter plate for diaphragm filter press

Abstract

The utility model belongs to sludge dewatering technical field, concretely relates to a filter plate for diaphragm filter press, including board body, graphene heating piece, heat conduction cover plate and annular frame board, the utility model discloses a graphene heating piece is integrated to the filter plate inside, can utilize its planar heating, high thermal efficiency, the excellent characteristic of rapid and uniform heating, can efficiently and stably pass through heat conduction cover plate and transmit heat to entire filter chamber, and the filter cake is heated quickly and uniformly, thereby the stable structure of bound water in sludge is efficiently destroyed, and the dewatering efficiency and dryness are improved significantly, still through multistage embedded design, while realizing efficient hot-pressing synergic dewatering, the stable sealing of heating system and the structural reliability of filter plate whole are ensured.

Description

Technical Field

[0001] This utility model belongs to the field of sludge dewatering technology, specifically relating to a filter plate for a diaphragm filter press. Background Technology

[0002] The diaphragm filter press is a key piece of equipment in the sludge dewatering process. Its operation mainly consists of two stages: First, the sludge is pumped into the filter chamber formed by adjacent closed filter plates. Under the pressure of the pump, the free water in the sludge passes through the filter cloth and is discharged, initially forming a filter cake in the filter chamber. Subsequently, high-pressure water is injected into the elastic diaphragm built into the filter plate, causing the diaphragm to inflate and perform a secondary mechanical pressing on the filter cake in the filter chamber, thereby further squeezing out the water and effectively reducing the moisture content of the filter cake.

[0003] However, for sludge with high viscosity, high colloid content, or high oil content, the water in such sludge often exists in the form of bound water and has a stable structure. Therefore, it is difficult to effectively break its bound state by simply relying on mechanical pressing, resulting in low dewatering efficiency and the high moisture content of the final filter cake.

[0004] To improve this situation, existing technologies can use external preheating of sludge to reduce its viscosity, but this method generally suffers from large heat loss and low thermal efficiency, and often requires the addition of a complex auxiliary heating system, which increases equipment cost and maintenance difficulty. Utility Model Content

[0005] The purpose of this invention is to provide a filter plate for a diaphragm filter press, which solves the technical problem that it is difficult to effectively separate bound water by simply relying on mechanical pressing in the prior art.

[0006] This utility model discloses a filter plate for a diaphragm filter press, comprising: The plate has a feeding surface and a sealing surface, and the feeding surface is recessed inward in sequence to form a first-stage sinking platform, a second-stage sinking platform and a third-stage sinking platform; Graphene heating elements are embedded within the three-stage sinking platform; A heat-conducting cover plate is embedded in the secondary recessed platform and covers the graphene heating element; An annular frame plate is embedded and fixed within the primary recessed platform, and the periphery of the heat-conducting cover plate is pressed and fixed to the bottom surface of the secondary recessed platform.

[0007] This application integrates graphene heating elements into the filter plate, utilizing their excellent properties of surface heating, high thermal efficiency, rapid and uniform heating. This allows for efficient and stable heat transfer through the heat-conducting cover plate to the entire filter chamber, rapidly and uniformly heating the filter cake. This effectively disrupts the stable structure of bound water in the sludge, significantly improving dewatering efficiency and dryness. Furthermore, through a multi-stage embedded design, it achieves efficient thermo-pressurized dewatering while ensuring the stable sealing of the heating system and the overall structural reliability of the filter plate.

[0008] Based on the above technical solution, the solution of this application can be further improved as follows: Preferably, the feed surface is provided with a first annular groove, which surrounds the outer periphery of the primary settling platform and is used to install a sealing ring. This solution ensures that the filter plates can form a uniform and reliable seal with adjacent filter plates when the plates are pressed together, effectively preventing high-pressure sludge slurry from leaking from the edge of the filter chamber and ensuring the airtightness and pressure stability of the dewatering process.

[0009] Preferably, the bottom surface of the secondary settling platform is provided with a second annular groove, which surrounds the outer periphery of the tertiary settling platform for installing a sealing ring. This solution effectively prevents moisture and sludge in the filter chamber from seeping into the tertiary settling platform where the graphene heating element is installed under high pressure along the edge of the heat-conducting cover plate, greatly improving the moisture-proof, insulation safety and long-term operational reliability of the graphene heating element.

[0010] Preferably, the bottom surface of the three-stage sinking platform has a plurality of spaced-apart primary bosses, and the graphene heating sheet has a first through hole that matches the primary bosses. This solution achieves precise positioning and anti-movement fixation of the graphene heating sheet within the three-stage sinking platform, thereby simplifying the assembly process and ensuring the accuracy of the heating sheet's position.

[0011] Preferably, the top surface of the primary boss protrudes to form a secondary boss, and the heat-conducting cover plate has a second through hole that matches the secondary boss. A pressure plate is installed on the top surface of the secondary boss, and the pressure plate presses and fixes the heat-conducting cover plate. This solution achieves precise positioning and axial pressing, ensuring close contact between the heat-conducting cover plate and the graphene heating element, improving heat conduction efficiency, dispersing the pressing force, avoiding stress concentration, and improving structural stability and long-term operational reliability.

[0012] Preferably, a third annular groove is provided on the top surface of the primary boss, and the third annular groove surrounds the outer periphery of the secondary boss for installing a sealing ring. This solution effectively prevents high-pressure sludge water from seeping into the interior through the assembly gap between the heat-conducting cover plate and the primary boss, thereby improving the sealing reliability and long-term safe operation capability of the electric heating element under harsh working conditions.

[0013] Preferably, the heat-conducting cover plate has multiple spaced protrusions on the side away from the graphene heating plate, and the protrusions form a flow channel for draining the filtrate. This solution forms an efficient drainage path for the filtrate, which can effectively prevent the liquid flow blockage caused by the filter cloth being completely attached to the surface of the heat-conducting cover plate, and ensure that the squeezed water can be quickly discharged along the flow channel, thereby significantly improving the dehydration rate. It also provides stable multi-point support for the filter cloth, which is conducive to uniform pressure transmission, and as the main heat transfer contact point, it can transfer heat to the filter cake more concentratedly.

[0014] Preferably, the outer side wall of the plate is provided with drainage channels, and the wall of the drainage channels is provided with multiple drainage through holes, each of which is connected to the bottom edge of the first-stage settling platform; The bottom surface of the annular frame plate is provided with multiple drainage grooves. One end of each drainage groove leads to the inner area of ​​the annular frame plate, and the other end connects to the corresponding drainage through hole, together forming a drainage path for exporting the filtrate from the primary settling platform. This solution achieves efficient and rapid export of the filtrate, effectively prevents the liquid from stagnating in the primary settling platform, ensures smooth drainage of the filter plate working surface, and enhances the reliability and stability of the filter plate operation.

[0015] Preferably, the drainage path is provided in multiple ways and distributed at the four corners of the filter plate. This solution ensures that the filtrate can be quickly and evenly collected and discharged from various areas of the filter chamber edge during the pressure filtration process, effectively avoiding local liquid accumulation or poor drainage, and also enhancing the overall structural stability and drainage reliability of the filter plate under high pressure working conditions.

[0016] Through the above technical solution, this utility model achieves the following beneficial effects: This application integrates graphene heating elements into the filter plate, utilizing their excellent properties of surface heating, high thermal efficiency, rapid and uniform heating. This allows for efficient and stable heat transfer through the heat-conducting cover plate to the entire filter chamber, rapidly and uniformly heating the filter cake. This effectively disrupts the stable structure of bound water in the sludge, significantly improving dewatering efficiency and dryness. Furthermore, through a multi-stage embedded design, it achieves efficient thermo-pressurized dewatering while ensuring the stable sealing of the heating system and the overall structural reliability of the filter plate. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the filter plate for the diaphragm filter press according to a specific embodiment of this application; Figure 2 for Figure 1 The image shows a perspective view of the filter plate used in the diaphragm filter press. Figure 3 for Figure 1 Schematic diagram of the feed surface of the middle plate; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 for Figure 3 Enlarged view of point B in the middle; Figure 6 for Figure 1 Schematic diagram of the sealing surface of the middle plate; Figure 7 for Figure 1 Schematic diagram of the structure of the central ring frame plate; Figure 8 for Figure 7 Enlarged view of point C in the middle; Figure 9 for Figure 2 The image shows a cross-sectional view of a filter plate used in a diaphragm filter press. Figure 10 for Figure 9 Enlarged view of point D in the middle; Explanation of reference numerals in the attached figures: 1. Plate body; 2. Graphene heating element; 3. Thermally conductive cover plate; 4. Annular frame plate; 5. Pressure plate; 11. Feeding surface; 12. Sealing surface; 13. Drainage channel; 14. Drainage through hole; 21. First through hole; 31. Second through hole; 32. Protrusion; 41. Drainage groove; 111. Primary sinkhole; 112. Secondary sinkhole; 113. Tertiary sinkhole; 114. First annular groove; 115. Second annular groove; 116. Primary boss; 117. Secondary boss; 118. Third annular groove. Detailed Implementation

[0019] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0020] First, it should be noted that some directional terms used in the following description to clearly illustrate the technical solution of this utility model, such as the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," are all derived from the normal orientation of the components in the filter plate of the diaphragm filter press. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] To better understand the above technical solutions, the following will provide a detailed description of the technical solutions in conjunction with the accompanying drawings and specific embodiments.

[0024] Example: like Figures 1-4 As shown in the embodiment of this application, a filter plate for a diaphragm filter press is disclosed. It is mainly used for the treatment of difficult-to-dewater materials such as municipal sludge and industrial sludge. It can achieve efficient removal of bound water through the synergistic effect of integrated heating and mechanical pressing. Its specific structure includes: plate body 1, graphene heating sheet 2, heat-conducting cover plate 3 and annular frame plate 4.

[0025] Plate 1 is the base of the entire filter plate and is used to provide a mounting base for all other components. It has a feed surface 11 and a sealing surface 12. The feed surface 11 is recessed inward in sequence to form a primary settling platform 111, a secondary settling platform 112 and a tertiary settling platform 113.

[0026] Specifically, the first-level recessed platform 111 is the shallowest layer, used to accommodate and fix the annular frame plate 4; the second-level recessed platform 112 is the next deepest layer, used to accommodate and position the heat-conducting cover plate 3, and to provide it with a reliable mounting reference surface; the third-level recessed platform 113 is the deepest layer, used to accommodate and position the graphene heating element 2, and to provide it with a protected mounting groove.

[0027] The graphene heating element 2 is embedded in the three-stage settling platform 113. After being powered on, it can convert electrical energy into heat energy, thereby directly heating the heat-conducting cover plate 3 above, thus transferring heat to the filter cake. It is protected inside the plate body 1, which can avoid direct contact with sludge, thereby preventing corrosion, short circuit and mechanical damage.

[0028] It should be noted that graphene material has ultra-high thermal conductivity and electrothermal conversion efficiency, enabling rapid heating and extremely uniform temperature distribution, effectively avoiding local overheating damage to the filter cloth or heating element itself; at the same time, the graphene heating element 2 is flexible and ultra-thin, improving structural compactness and better fitting the bottom surface of the three-stage sink 113, thereby reducing contact thermal resistance, improving heat transfer efficiency, and enhancing the structural adaptability and durability of the heating element under long-term vibration and pressing conditions.

[0029] The heat-conducting cover plate 3 is embedded in the secondary settling platform 112 and covers the graphene heating plate 2. It is used to quickly and evenly transfer heat to the entire filter cake to avoid local overheating; it also provides a flat support surface for the filter cloth to ensure uniform force during pressing; it also separates the graphene heating plate 2 from the sludge and water in the filter chamber, playing a sealing and insulation role and protecting the graphene heating plate 2.

[0030] For example, the heat-conducting cover plate 3 is made of stainless steel, which can effectively resist corrosion, ensure long-term reliability and lifespan, and has sufficient strength and rigidity to provide stable support for the filter cloth, prevent deformation, and has thermal conductivity to meet the requirements of uniform heat transfer, and is also easy to process.

[0031] The annular frame plate 4 is embedded and fixed in the primary sink 111, and the periphery of the heat-conducting cover plate 3 is pressed and fixed to the bottom surface of the secondary sink 112, thereby ensuring that the heat-conducting cover plate 3 and the bottom surface of the secondary sink 112 are tightly fitted, thus forming a reliable seal to prevent sludge and water from seeping into the interior from the edge and damaging the graphene heating plate 2; and the inner area of ​​the annular frame plate 4 and the heat-conducting cover plate 3 together form a filter chamber.

[0032] For example, the annular frame plate 4 is connected and fixed to the plate body 1 with bolts, which can provide strong clamping force to ensure reliable sealing, and also make the annular frame plate 4 easy to install and disassemble, facilitating the maintenance and replacement of internal components.

[0033] This invention integrates graphene heating elements 2 into the filter plate, utilizing their excellent properties of surface heating, high thermal efficiency, rapid and uniform heating. It can efficiently and stably transfer heat to the entire filter chamber through the heat-conducting cover plate 3, rapidly and uniformly heating the filter cake. This effectively disrupts the stable structure of bound water in the sludge, significantly improving dewatering efficiency and dryness. Furthermore, through a multi-stage embedded design, it achieves efficient thermal-pressure synergistic dewatering while ensuring the stable sealing of the heating system and the overall structural reliability of the filter plate.

[0034] In some embodiments, such as Figure 3 and Figure 4 As shown, the feed surface 11 has a first annular groove 114, which surrounds the outer periphery of the first stage sink 111 and is used to install the sealing ring.

[0035] By designing the first annular groove 114, a standard and stable installation position for the sealing ring can be provided, ensuring that the filter plate can form a uniform and reliable seal with the adjacent filter plate when the plates are pressed together. This effectively prevents high-pressure sludge from leaking from the edge of the filter chamber, ensuring the airtightness and pressure stability of the dewatering process, and significantly improving the reliability and service life of the equipment.

[0036] In some embodiments, such as Figure 3 and Figure 4 As shown, a second annular groove 115 is provided on the bottom surface of the secondary sinking platform 112. The second annular groove 115 surrounds the outer periphery of the tertiary sinking platform 113 and is used to install the sealing ring.

[0037] By designing the second annular groove 115, a secondary sealing barrier is formed, which effectively prevents moisture and sludge in the filter chamber from seeping into the tertiary settling platform 113 where the graphene heating element 2 is installed under high pressure along the edge of the heat-conducting cover plate 3. This greatly improves the moisture-proof, insulation safety and long-term operational reliability of the graphene heating element 2.

[0038] In some embodiments, such as Figure 1 , Figure 3 and Figure 5 As shown, the bottom surface of the three-stage sink 113 has a plurality of spaced-apart primary bosses 116, and the graphene heating plate 2 has a first through hole 21 that matches the primary bosses 116.

[0039] Through the above design, the graphene heating element 2 is accurately positioned and fixed in place within the three-stage sink 113, thereby simplifying the assembly process and ensuring the accuracy of the heating element's position.

[0040] In this embodiment, as Figure 1 , Figure 3 and Figure 5As shown, a secondary boss 117 is formed by the protrusion of the top surface of the primary boss 116. A second through hole 31 matching the secondary boss 117 is provided on the heat-conducting cover plate 3. A pressure plate 5 is installed on the top surface of the secondary boss 117. The pressure plate 5 presses and fixes the heat-conducting cover plate 3.

[0041] For example, the pressure plate 5 and the top surface of the secondary boss 117 are connected and fixed by bolts, which ensures the stability of the connection and makes the pressure plate 5 easy to install and disassemble, and convenient for maintenance and replacement.

[0042] Through the above design, the heat-conducting cover plate 3 is accurately positioned and axially pressed, ensuring close contact between the heat-conducting cover plate 3 and the graphene heating plate 2, improving heat conduction efficiency. In addition, the pressing force is dispersed by the pressure plate 5, avoiding stress concentration and improving structural stability and long-term working reliability.

[0043] In this embodiment, as Figure 5 As shown, a third annular groove 118 is provided on the top surface of the primary boss 116. The third annular groove 118 surrounds the outer periphery of the secondary boss 117 and is used to install a sealing ring.

[0044] By designing the third annular groove 118, high-pressure sludge water is effectively prevented from seeping into the internal cavity through the assembly gap between the heat-conducting cover plate 3 and the first-level boss 116, which greatly improves the sealing reliability and long-term safe operation capability of the graphene heating plate 2 under harsh working conditions.

[0045] In some embodiments, such as Figure 1 and Figure 2 As shown, the heat-conducting cover plate 3 has multiple spaced protrusions 32 on the side away from the graphene heating plate 2, and a flow channel for discharging the filtrate is formed between each protrusion 32.

[0046] It should be noted that, Figure 1 and Figure 2 The central protrusion 32 is only shown as a partial example; in actual use, it needs to cover the entire inner area of ​​the annular frame plate 4.

[0047] For example, the protrusion 32 adopts a circular design, which effectively avoids the wear caused by sharp corners to the filter cloth and extends the service life of the filter cloth; at the same time, the circular shape also facilitates the smooth flow of filtrate in all directions, avoids flow dead zones, and further optimizes the filtrate discharge efficiency.

[0048] Through the above design, an efficient drainage path for the filtrate is formed, which can effectively prevent the flow blockage caused by the complete adhesion between the filter cloth and the surface of the heat-conducting cover plate 3. This ensures that the squeezed water can be quickly discharged along the flow channel, thereby significantly improving the dehydration rate. It also forms a stable multi-point support for the filter cloth, which is conducive to the uniform transmission of pressure. As the main heat transfer contact point, it can transfer heat to the filter cake more concentratedly, thereby achieving a synergistic improvement in drainage efficiency, mechanical stability and thermal energy utilization.

[0049] In some embodiments, such as Figure 4 , Figures 7-10 As shown, the outer side wall of the plate 1 is provided with drainage channels 13, and the wall of the drainage channels 13 is provided with multiple drainage through holes 14, each drainage through hole 14 being connected to the bottom edge of the first-stage settling platform 111. The bottom surface of the annular frame plate 4 is provided with multiple drainage grooves 41. One end of each drainage groove 41 leads to the inner area of ​​the annular frame plate 4, and the other end is connected to the corresponding drainage through hole 14, which together form a drainage path for exporting the filtrate in the first-stage settling platform 111.

[0050] Through the above design, efficient and rapid discharge of filtrate is achieved, effectively preventing liquid retention in the primary settling platform 111, ensuring smooth drainage of the filter plate feed surface 11, and enhancing the reliability and stability of the filter plate operation.

[0051] Based on the above embodiments, such as Figure 3 As shown, multiple drainage paths are provided and distributed at the four corners of the filter plate. This ensures that the filtrate can be quickly and evenly collected and discharged from various areas at the edge of the filter chamber during the filtration process. This effectively avoids local liquid accumulation or poor drainage, and also enhances the overall structural stability and drainage reliability of the filter plate under high pressure.

[0052] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of this invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0053] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A filter plate for a diaphragm filter press, characterized in that, include: The plate has a feeding surface and a sealing surface, and the feeding surface is recessed inward in sequence to form a first-stage sinking platform, a second-stage sinking platform and a third-stage sinking platform; Graphene heating elements are embedded within the three-stage sinking platform; A heat-conducting cover plate is embedded in the secondary recessed platform and covers the graphene heating element; An annular frame plate is embedded and fixed within the primary recessed platform, and the periphery of the heat-conducting cover plate is pressed and fixed to the bottom surface of the secondary recessed platform.

2. The filter plate for a diaphragm filter press according to claim 1, characterized in that, The feed surface has a first annular groove, which surrounds the outer periphery of the first-stage sink platform and is used to install a sealing ring.

3. The filter plate for a diaphragm filter press according to claim 1, characterized in that, The bottom surface of the secondary sinking platform is provided with a second annular groove, which surrounds the outer periphery of the tertiary sinking platform and is used to install a sealing ring.

4. The filter plate for a diaphragm filter press according to claim 1, characterized in that, The bottom surface of the three-stage sinking platform is raised to form multiple spaced primary protrusions, and the graphene heating plate is provided with a first through hole that matches the primary protrusions.

5. The filter plate for a diaphragm filter press according to claim 4, characterized in that, The top surface of the primary boss protrudes to form a secondary boss. The heat-conducting cover plate has a second through hole that matches the secondary boss. A pressure plate is installed on the top surface of the secondary boss, and the pressure plate presses and fixes the heat-conducting cover plate.

6. The filter plate for a diaphragm filter press according to claim 5, characterized in that, The top surface of the primary boss is provided with a third annular groove, which surrounds the outer periphery of the secondary boss and is used to install a sealing ring.

7. The filter plate for a diaphragm filter press according to claim 1, characterized in that, The heat-conducting cover plate has multiple spaced protrusions on the side away from the graphene heating plate, and the protrusions form a flow channel for discharging the filtrate.

8. The filter plate for a diaphragm filter press according to claim 1, characterized in that, The outer side wall of the plate is provided with drainage channels, and the wall of the drainage channels is provided with multiple drainage through holes, each of which is connected to the bottom edge of the first-stage settling platform. The bottom surface of the annular frame plate is provided with multiple drainage grooves. One end of each drainage groove leads to the inner area of ​​the annular frame plate, and the other end connects to the corresponding drainage through hole, which together form a drainage path for exporting the filtrate in the primary settling platform.

9. The filter plate for a diaphragm filter press according to claim 8, characterized in that, The drainage path is provided in multiple ways and is distributed at the four corners of the filter plate.

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