Filter press filter plate and filter press containing the filter plate

Abstract

The present invention belongs to the technical field of filter press equipment, and particularly relates to a filter plate of a filter press and a filter press containing the filter plate. The filter plate of the filter press comprises a filter plate A (10) and a filter plate B (20) arranged adjacent to each other. The filter plates A (10) and B (20) form an extrusion sealing surface for sealing at their edges. The extrusion sealing surface comprises a primary sealing surface (31) and a secondary sealing surface (32). The area of ​​the primary sealing surface (31) is 1-2 times the area of ​​the secondary sealing surface (32). The primary sealing surface (31) and the secondary sealing surface (32) are not on the same plane. The extrusion sealing surface is formed with a sealing gasket (40) only on the secondary sealing surface (32). The extrusion sealing surfaces of the filter plates A (10) and B (20) are in a step-like shape that fits each other. The secondary sealing surface (32) is located on the periphery of the primary sealing surface (31). The present invention enhances the sealing effect of the filter plate by improving the filter plate structure, so that the filter plate can meet the requirements of a high dry working pressure of 5-10 MPa.

Description

Technical Field

[0001] The invention belongs to the technical field of filter press equipment, and in particular relates to a filter press filter plate and a filter press containing the filter plate. Background Art

[0002] A filter press is a general-purpose mechanical device used for solid-liquid separation. It primarily consists of five components: a frame, filter plates, filter cloth, control system, and hydraulic system. The continuously stacked filter plates are compressed to form a sealed filter chamber. The filter cloth, typically woven from materials such as nylon, serves as the primary filter medium during the initial stages of filtration. The hydraulic system, consisting of one or more hydraulic cylinders, a high-pressure oil pump, a fuel tank, and pipelines, provides the pressure required to hold the filter plates in place.

[0003] During the filtration process, a pressure pump injects water-containing sludge into the various filter chambers of the filter press. Due to the pressure, the liquid flows through the filter cloth, while solid particles are retained by the cloth, gradually filling the filter chambers over time to form a filter cake. This is followed by air dehydration. During this step, compressed air is blown into the filter cake, displacing air and water, removing moisture from the cake. During the unloading step, the filter press's hydraulic cylinders gradually open all the filter chambers, allowing the filter cake to fall by gravity, completing the unloading process.

[0004] It can be seen from the above working principle that the filter plate is an important component of the filter press, and the quality of its operating conditions has a great influence on the filtration of the equipment. However, when the filter press is working, the problem of material leakage often occurs. Chinese patent document CN201643821 U discloses a sealed filter plate, which is provided with a dovetail groove on the sealing surface around the filter plate, and a rubber strip is installed in the dovetail groove, and the sealing on the sealing surface is achieved by squeezing the rubber strip by the adjacent filter plates. However, the provision of the rubber strip reduces the sealing degree of other parts of the sealing surface to a certain extent. Under the conventional working pressure of about 1MPa, the sealing effect of this method is acceptable. However, under the high-dry pressing environment, the working pressure is generally above 5MPa. Under such a high working pressure, the sealing performance of the rubber strip on the sealing surface is extremely unstable. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned defects of the prior art and provide a filter plate for a filter press which has good sealing performance under high dry pressing requirements of materials.

[0006] To achieve the above object, the technical solution of the present invention is as follows:

[0007] The filter plates of the filter press include filter plates A and filter plates B arranged adjacent to each other. Filter plates A and filter plates B form an extrusion sealing surface for sealing at their edges. The extrusion sealing surface includes a primary sealing surface and a secondary sealing surface. The primary sealing surface and the secondary sealing surface are not on the same plane. The extrusion sealing surface is formed with a sealing gasket only on the secondary sealing surface.

[0008] The inventive concept of the present invention is:

[0009] Two sealing surfaces are provided to achieve a secondary seal. One of the primary seals is between the primary sealing surfaces of filter plates A and B, on which no sealing gasket is provided, thereby ensuring the flatness between the primary sealing surfaces and producing a better sealing effect under high pressure. Another level of seal is provided between the secondary sealing surfaces, on which a sealing gasket is provided, and the sealing gasket and the secondary sealing surface together achieve a secondary seal. The primary sealing surface and the secondary sealing surface are not on the same plane, which, on the one hand, ensures the flatness between the primary sealing surfaces, and on the other hand, increases the resistance of muddy water to the movement of water in the gap. Under high pressure, if muddy water passes through the primary sealing surface, the bend between the primary and secondary sealing surfaces will have a greater obstruction effect on the pressure, greatly reducing the pressure of the muddy water on the secondary sealing surface and greatly improving the overall sealing effect.

[0010] As an improvement, the area of ​​the primary sealing surface is 1-2 times the area of ​​the secondary sealing surface, so that the role of the primary sealing surface is prominent and the working pressure of the secondary sealing surface is reduced.

[0011] As an improvement, the extrusion sealing surfaces of filter plates A and B are stepped, with the secondary sealing surface located outside the primary sealing surface. Generally, squeezed material can corrode the sealing gasket to some extent, and chemical sludge is particularly corrosive. This arrangement reduces the likelihood of contact between the sludge and the sealing gasket, helping to ensure the effectiveness of the sealing gasket.

[0012] As an improvement, after filter plates A and B are assembled, a buffer cavity is formed between the primary and secondary sealing surfaces. If some muddy water penetrates one sealing surface, the buffer cavity helps reduce the pressure of the muddy water, preventing it from continuing to penetrate the other sealing surface.

[0013] As an improvement, the buffer cavity is arranged perpendicularly or parallel to the main sealing surface.

[0014] As an improvement, a dovetail groove is provided on the secondary sealing surface, and a rubber strip is embedded in the dovetail groove to form a sealing gasket.

[0015] As an improvement, a sealing gasket is provided on each of the secondary sealing surfaces of the filter plate A and the filter plate B, thereby forming a double-layer seal on the secondary sealing surface.

[0016] As an improvement, the sealing gasket on the secondary sealing surface is laid in sheet form on the surface of the secondary sealing surface to maximize the sealing effect of the sealing gasket.

[0017] As an improvement, the secondary sealing surfaces of the filter plates A and B are arranged as inclined surfaces to facilitate the matching of the filter plates A and B.

[0018] The present invention also provides a filter press, including a frame and a filter plate located on the frame, the filter plate is composed of several groups of filter plates A and filter plates B, the filter plates A and filter plates B form an extrusion sealing surface for sealing at the edge, the extrusion sealing surface includes a primary sealing surface and a secondary sealing surface, the primary sealing surface and the secondary sealing surface are not on the same plane, and the extrusion sealing surface is formed with a sealing gasket only on the secondary sealing surface.

[0019] In summary, the present invention improves the sealing effect of the filter plate by improving the filter plate structure, so that the filter plate can adapt to the requirement of high dry working pressure of 5-10 MPa. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the structure of a filter press using the filter plate of the present invention;

[0021] Figure 2 Schematic diagram of the structure of filter plate A and filter plate B in Example 1 of the present invention and a schematic diagram of the structure of the combination of filter plate A and filter plate B;

[0022] Figure 3 For the present invention Figure 2 Enlarged view of part A in the middle;

[0023] Figure 4 Schematic diagram of the structure of filter plate A and filter plate B and the structure schematic diagram of the combination of filter plate A and filter plate B in Example 2 of the present invention;

[0024] Figure 5 For the present invention Figure 4 Enlarged view of middle part B;

[0025] Figure 6 Schematic diagram of the structure of filter plate A and filter plate B and the structure schematic diagram of the combination of filter plate A and filter plate B in Example 3 of the present invention;

[0026] Figure 7 For the present invention Figure 6 Enlarged view of part C in the middle.

[0027] In the figure: 10, filter plate A; 20, filter plate B; 31, primary sealing surface; 32, secondary sealing surface; 40, sealing gasket; 50, buffer cavity; 60, pressing chamber; 70, frame. DETAILED DESCRIPTION

[0028] Example 1

[0029] like Figure 2 、 Figure 3As shown, the filter press filter plates of the present invention include two types, filter plate A10 and filter plate B20. These two types of plates are arranged adjacent to each other, forming a pressing chamber 60 between filter plates A10 and B20. The aqueous sludge is pressed within the pressing chamber 60. Extrusion sealing surfaces are formed at the edges of filter plates A10 and B20. These surfaces include a primary sealing surface 31 and a secondary sealing surface 32. The primary sealing surface 31 and the secondary sealing surface 32 form a step-like structure that fits together, with the primary sealing surface 31 located on the inside and the secondary sealing surface 32 located on the outside. The primary sealing surface 31 and the secondary sealing surface 32 are not coplanar, and the area of ​​the primary sealing surface 31 is 1-2 times that of the secondary sealing surface 32.

[0030] After filter plates A10 and B20 are assembled, a buffer cavity 50 is formed between the primary sealing surface 31 and the secondary sealing surface 32. Buffer cavity 50 is perpendicular to primary sealing surface 31. Secondary sealing surface 32 includes a dovetail groove into which a rubber strip can be inserted to form a sealing gasket 40. A sealing gasket 40 is installed on each secondary sealing surface 32 of filter plates A10 and B20, creating a double-layer seal.

[0031] like Figure 1 As shown, the filter press of the present invention includes a frame 70 and filter plates located on the frame, and the filter plates are composed of several groups of filter plates A10 and filter plates B20.

[0032] Example 2

[0033] like Figure 4 and Figure 5 As shown, the difference between this embodiment and embodiment 1 is that:

[0034] The sealing gasket 40 on the secondary sealing surface 32 is applied in a sheet-like manner to the surface of the secondary sealing surface 32 to enhance the function of the sealing gasket 40. When the sealing gasket 40 ages or wears out, it can be replaced, and the sheet-like sealing gasket 40 is more convenient to replace. In this case, the buffer cavity 50 is arranged parallel to the primary sealing surface 31.

[0035] Example 3

[0036] like Figure 6 and Figure 7 As shown, the difference between this embodiment and embodiment 1 is that:

[0037] The secondary sealing surfaces 32 of filter plates A10 and B20 are inclined to facilitate better cooperation between the primary sealing surface 31 and the secondary sealing surface 32. The sealing gasket 40 on the secondary sealing surface 32 is in sheet form and is applied on the surface of the secondary sealing surface 32.

Claims

1. A filter press filter plate, comprising a filter plate A (10) and a filter plate B (20) disposed adjacent to each other, wherein the filter plate A (10) and the filter plate B (20) form an extrusion sealing surface for sealing at their edges, characterized in that: The extrusion sealing surface includes a primary sealing surface (31) and a secondary sealing surface (32), the primary sealing surface (31) and the secondary sealing surface (32) are not on the same plane, and the extrusion sealing surface is formed with a sealing gasket (40) only on the secondary sealing surface (32); the extrusion sealing surfaces of the filter plate A (10) and the filter plate B (20) are in a step-like shape that fits with each other, and the secondary sealing surface (32) is located on the periphery of the primary sealing surface (31); after the filter plate A (10) and the filter plate B (20) are assembled, a buffer cavity (50) is formed between the primary sealing surface (31) and the secondary sealing surface (32).

2. The filter plate of the filter press according to claim 1, characterized in that: The area of ​​the primary sealing surface (31) is 1-2 times the area of ​​the secondary sealing surface (32).

3. The filter plate of the filter press according to claim 1, characterized in that: The buffer cavity (50) is arranged perpendicularly or parallel to the main sealing surface (31).

4. The filter plate of the filter press according to claim 1, characterized in that: A dovetail groove is provided on the secondary sealing surface (32), and a rubber strip is embedded in the dovetail groove to form a sealing gasket (40).

5. The filter plate of the filter press according to claim 1, characterized in that: A sealing gasket (40) is provided on each of the secondary sealing surfaces (32) of the filter plate A (10) and the filter plate B (20), thereby forming a double-layer seal on the secondary sealing surface (32).

6. The filter plate of the filter press according to claim 1, characterized in that: The sealing gasket on the secondary sealing surface (32) is laid in a sheet shape on the surface of the secondary sealing surface (32).

7. The filter plate of the filter press according to claim 1, characterized in that: The secondary sealing surfaces (32) of the filter plate A (10) and the filter plate B (20) are arranged in an inclined manner.

8. A filter press comprising a filter plate as claimed in claim 1, comprising a frame (70) and a filter plate located on the frame, wherein the filter plate is formed by a plurality of groups of filter plates A (10) and filter plates B (20), wherein the filter plates A (10) and the filter plates B (20) form an extrusion sealing surface for sealing at their edges, and wherein: The extrusion sealing surface comprises a primary sealing surface (31) and a secondary sealing surface (32); the primary sealing surface (31) and the secondary sealing surface (32) are not on the same plane; the extrusion sealing surface is formed with a sealing gasket (40) only on the secondary sealing surface (32).

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