High pressure and high temperature diaphragm for filter press

Abstract

The utility model relates to solid -liquid separation mechanical equipment technical field, and disclose a kind of high-pressure high-temperature diaphragm for filter press, including diaphragm body and the main support boss of its working face center and the auxiliary convex point around it. Diaphragm body internal cavity is embedded with honeycomb support, and the fiber grid woven by aramid fiber is embedded in its interstice, and non-working face is provided with radial reinforcing rib. Diaphragm is integrally formed with buth Qing rubber, and working face is coated with polytetrafluoroethylene coating. The utility model provides uniform three-dimensional support through honeycomb-fiber composite structure, main support boss resists central stress, auxiliary convex point promotes filtrate flow, radial reinforcing rib guides stress diffusion, and polytetrafluoroethylene coating ensures filter cake complete shedding, which solves the technical problems that traditional diaphragm is easy to burst, short service life and difficult to unload cake under high pressure and high temperature conditions, significantly improves the compression strength, temperature resistance and operation efficiency of diaphragm.

Description

Technical Field

[0001] This utility model relates to the field of solid-liquid separation mechanical equipment technology, specifically a high-pressure, high-temperature diaphragm sheet for a filter press. Background Technology

[0002] Filter presses are key equipment for solid-liquid separation in industries such as mining, chemicals, and environmental protection. The diaphragms in these presses expand after filtration, subjecting the filter cake to secondary compression to further reduce its moisture content. However, under harsh operating conditions of high pressure (e.g., above 2.0 MPa) and high temperature (e.g., exceeding 100°C), traditional diaphragm structures face severe challenges: First, high temperatures accelerate the aging of rubber materials, reducing their strength and elasticity and significantly shortening their lifespan; second, extremely high compression pressure can easily cause irreversible excessive expansion and deformation of the diaphragm, even tearing or bursting from the center; third, repeated deformation fatigue and chemical corrosion from high-temperature filter slurry further exacerbate the risk of diaphragm failure. Therefore, there is an urgent need for a filter press diaphragm that simultaneously possesses excellent resistance to high-temperature aging, ultra-high compressive strength, outstanding fatigue toughness, and a long service life. Utility Model Content

[0003] In view of the shortcomings of the existing technology, this utility model provides a high-pressure and high-temperature diaphragm sheet for filter presses.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a high-pressure and high-temperature diaphragm sheet for a filter press, comprising a diaphragm sheet body, wherein a main support boss is provided at the center of the working surface of the diaphragm sheet body, and a plurality of auxiliary protrusions are distributed around the main support boss on the working surface, wherein the diaphragm sheet body has a cavity inside, and a honeycomb support is embedded in the cavity.

[0005] Preferably, the gaps in the honeycomb support are embedded with fiber mesh.

[0006] Preferably, the non-working surface of the diaphragm sheet body is provided with multiple reinforcing ribs.

[0007] Preferably, the diaphragm body, main support boss, and auxiliary protrusions are integrally molded from a high-temperature resistant elastic material.

[0008] Preferably, the fiber mesh is woven from aramid fibers.

[0009] Preferably, the reinforcing ribs are radially distributed with the center of the non-working surface as the center.

[0010] Preferably, the working surface of the diaphragm body is coated with a polytetrafluoroethylene coating.

[0011] Preferably, the high-temperature resistant elastic material is nitrile rubber.

[0012] Compared with the prior art, the present invention has the following beneficial effects: By embedding a honeycomb-shaped support reinforced with fiber mesh inside the working surface of the main support boss and auxiliary protrusions, and setting radial reinforcing ribs on the non-working surface, a multi-layered, three-dimensional reinforcement system is constructed, which makes the stress distribution of the diaphragm uniform under high pressure, and significantly improves its resistance to bulging deformation and bursting. At the same time, the use of high-temperature resistant elastic material integrally molded and coated with polytetrafluoroethylene not only ensures the stability and fatigue resistance of the overall structure in high-temperature environment, but also effectively reduces filter cake adhesion, thus comprehensively solving the industry pain points of traditional diaphragms under high pressure and high temperature conditions, such as easy tearing, short life and difficult cake unloading. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a rear view of the three-dimensional structure of this utility model; Figure 3 This is a cross-sectional view of the internal structure of this utility model.

[0014] Among them: 1. Diaphragm body; 101. Cavity; 2. Main support boss; 3. Auxiliary protrusions; 4. Honeycomb support; 5. Fiber mesh; 6. Reinforcing ribs. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1 - Figure 3 This utility model provides a technical solution: a high-pressure and high-temperature diaphragm sheet for a filter press, comprising a diaphragm sheet body 1, wherein a main support boss 2 is provided at the center of the working surface of the diaphragm sheet body 1, and a plurality of auxiliary protrusions 3 are distributed around the main support boss 2 on the working surface. The diaphragm sheet body 1 has a cavity 101 inside, and a honeycomb support 4 is embedded in the cavity 101.

[0017] Through the above technical solutions, the main support protrusion 2 effectively resists the concentrated stress and wear in the central area, the auxiliary protrusion 3 promotes the flow of filtrate and the shedding of filter cake, and the built-in honeycomb support 4 provides uniform and strong three-dimensional support for the entire membrane, together giving the diaphragm excellent resistance to high pressure bulging and fatigue resistance.

[0018] Furthermore, the gaps in the honeycomb support 4 are embedded with fiber mesh 5; the fiber mesh 5 is woven from aramid fibers.

[0019] Through the above technical solution, the aramid fiber woven mesh 5 is embedded in the gaps of the honeycomb support 4, and the two are closely combined to form a high-performance three-dimensional reinforced skeleton. This composite structure not only greatly improves the overall tensile strength and burst pressure resistance of the diaphragm, but also effectively suppresses anisotropic deformation under high pressure, making the stress distribution more uniform. At the same time, the excellent high temperature resistance and fatigue resistance of aramid fiber itself further ensures the long-term stability and durability of the reinforced skeleton under high temperature and high pressure conditions.

[0020] Furthermore, the non-working surface of the diaphragm body 1 is provided with a plurality of reinforcing ribs 6; the reinforcing ribs 6 are radially distributed with the center of the non-working surface as the center.

[0021] Through the above technical solution, the radially distributed reinforcing ribs 6 can effectively guide the diaphragm body 1 to deform uniformly along a predetermined trajectory when it is pressurized and bulged. This not only significantly improves the overall structural rigidity of the diaphragm, but more importantly, it orderly disperses the concentrated stress generated during the working process from the central main support boss 2 to the surrounding edges, avoiding material fatigue damage caused by local stress concentration. This greatly improves the tear resistance and service life of the diaphragm under repeated high pressure.

[0022] Furthermore, the diaphragm body 1, the main support boss 2, and the auxiliary protrusions 3 are integrally molded from a high-temperature resistant elastic material; the high-temperature resistant elastic material is nitrile rubber.

[0023] By adopting the integrated molding technique of nitrile rubber, the weak links at the connection of different components are fundamentally eliminated, ensuring the integrity and reliability of the overall structure of the diaphragm. The excellent high-temperature resistance and anti-aging ability of nitrile rubber itself enable the diaphragm to maintain excellent elastic recovery rate and mechanical strength under high-temperature conditions for a long time, thereby significantly improving the heat resistance, durability and service life of the product.

[0024] Furthermore, the working surface of the diaphragm body 1 is coated with a polytetrafluoroethylene coating.

[0025] Through the above technical solution, the polytetrafluoroethylene coating forms a non-sticky surface with low surface energy and high lubricity on the working surface of the diaphragm. This characteristic can significantly reduce the adhesion between the filter cake and the diaphragm, which not only ensures that the extruded filter cake can be quickly and completely removed, improving unloading efficiency and production capacity, but also its excellent chemical inertness and wear resistance effectively protect the diaphragm substrate, reduce the risk of wear and corrosion on the working surface, and thus further extend the service life of the diaphragm under complex working conditions.

[0026] The working principle of this utility model is as follows: When high-pressure fluid is injected into the cavity between the non-working surface of the diaphragm body 1 and the filter plate, the diaphragm body 1 expands and deforms uniformly towards the working surface under the action of fluid pressure. During this process, the honeycomb support 4 reinforced by aramid fiber mesh 5 inside provides stable three-dimensional support, effectively dispersing and bearing the pressure. The main support boss 2 at the center of the working surface is the first to contact the filter cloth and bear the maximum deformation stress, while the surrounding auxiliary bosses 3 work together to form a drainage channel to promote dewatering. At the same time, the radial reinforcing ribs 6 on the non-working surface scientifically guide the stress to diffuse to the surrounding edges, avoiding stress concentration. Combined with the polytetrafluoroethylene coating on the working surface, the combined effect of efficient extrusion dewatering and complete filter cake removal is finally achieved.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-pressure, high-temperature diaphragm sheet for a filter press, characterized in that: The diaphragm body (1) includes a main support boss (2) at the center of the working surface of the diaphragm body (1), and multiple auxiliary protrusions (3) are distributed around the main support boss (2) on the working surface. The diaphragm body (1) has a cavity (101) inside, and a honeycomb support (4) is embedded in the cavity (101).

2. The high-pressure, high-temperature diaphragm sheet for a filter press according to claim 1, characterized in that: The honeycomb support (4) has fiber mesh (5) embedded in its gaps.

3. The high-pressure, high-temperature diaphragm sheet for a filter press according to claim 2, characterized in that: The non-working surface of the diaphragm body (1) is provided with multiple reinforcing ribs (6).

4. The high-pressure, high-temperature diaphragm sheet for a filter press according to claim 1, characterized in that: The diaphragm body (1), main support boss (2) and auxiliary protrusion (3) are integrally molded from high temperature resistant elastic material.

5. The high-pressure, high-temperature diaphragm sheet for a filter press according to claim 2, characterized in that: The fiber mesh (5) is woven from aramid fibers.

6. The high-pressure, high-temperature diaphragm sheet for a filter press according to claim 3, characterized in that: The reinforcing ribs (6) are radially distributed with the center of the non-working surface as the center.

7. The high-pressure, high-temperature diaphragm sheet for a filter press according to claim 1, characterized in that: The working surface of the diaphragm body (1) is coated with a polytetrafluoroethylene coating.

8. The high-pressure, high-temperature diaphragm sheet for a filter press according to claim 4, characterized in that: The high-temperature resistant elastic material is nitrile rubber.

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