Filter unit of plate-and-frame filter and plate-and-frame filter

Abstract

The utility model relates to the field of plate-and-frame filters, and discloses a filter unit of a plate-and-frame filter, which comprises a filter frame, filter plates are arranged on two sides of the filter frame; the periphery of the filter plate extends out of a side plate along the direction far away from the filter frame; an accommodating cavity for accommodating a filter medium is defined by the side plates; a filter layer is arranged in the accommodating cavity; and a supporting net is arranged in the filtering layer. The filtering unit can improve the structural strength of the filtering layer, prevents diatomite from collapsing when the pressure is insufficient or the machine is stopped, and improves the production efficiency. Meanwhile, the utility model further provides a plate and frame type filter.

Description

Technical Field

[0001] The utility model relates to the field of plate-frame filters, in particular to a filter unit of a plate-frame filter and a plate-frame filter. Background Art

[0002] The main copper foil production processes include raw foil production, surface treatment, slitting, and packaging. The raw foil is deposited in a copper sulfate solution through the action of an electric current. The copper ingot is dissolved in sulfuric acid to produce a copper sulfate solution. Both the fresh electrolyte produced in the copper dissolution process and the electrolyte returning from the electrolytic cell are more or less contaminated by impurities such as organic matter, oils, and metal ions. Impurities in the electrolyte can cause serious quality issues in the copper foil, such as pinholes and burrs. To prevent these contaminants, the electrolyte is filtered through a plate and frame filter before entering the electrolytic cell.

[0003] In a plate and frame filter, the pressure generated by the electrolyte being transported into the filter by a power pump causes diatomaceous earth and activated carbon to adhere to the surface of the filter plate to form a filter layer. When the pressure is lower than a certain value or a pressure leak occurs, the diatomaceous earth and activated carbon will fall off the filter plate, thereby losing the filtering function and causing a large number of quality problems such as burrs, pinholes, and roughness on the copper foil.

[0004] CN116116108A discloses a diatomaceous earth filter and its use method, comprising: a filter canister, one end of which is connected to a liquid inlet pipe, the other end of which is connected to a liquid outlet pipe, the liquid inlet pipe being provided with a first check valve, and the liquid outlet pipe being provided with a second check valve; a filter assembly disposed within the filter canister, located between the liquid inlet pipe and the liquid outlet pipe, the filter assembly comprising a filter element and a filter layer attached to the surface of the filter element, the filter element being hollow inside; a power pump, connected to the filter element via a pipeline, to create a negative pressure between the filter element and the filter layer; and a first ultrasonic assembly disposed within the filter canister, corresponding to the filter assembly. This diatomaceous earth filter can significantly reduce the time required to recoat the filter layer, reduce the cost of handling diatomaceous earth collapse, and indirectly significantly improve economic benefits. However, it does not solve the problem of diatomaceous earth collapse.

[0005] The technical problem to be solved by the utility model is: how to prevent diatomaceous earth and activated carbon from falling off the filter plate. Utility Model Content

[0006] The main purpose of the utility model is to provide a filter unit of a plate-and-frame filter. By arranging side plates on the filter plate, the filter medium is attached to the filter plate to form a filter layer. The side plates can provide support for the filter medium. Moreover, by arranging a support net in the filter layer, the support for the filter medium is further strengthened to prevent the filter medium from falling off.

[0007] At the same time, a plate and frame filter is also provided.

[0008] To achieve the above objectives, the technical solutions adopted in this application are:

[0009] A filter unit of a plate-and-frame filter comprises a filter frame; filter plates are provided on both sides of the filter frame; side plates extend from the periphery of the filter plates in a direction away from the filter frame; the side plates form a receiving cavity for accommodating a filter medium; a filter layer is provided in the receiving cavity; and a support net is provided in the filter layer.

[0010] Preferably, the filter layer includes a diatomaceous earth filter layer and an activated carbon filter layer arranged in sequence along the direction away from the filter frame; the support net includes a first support net and a second support net; the first support net is arranged in the diatomaceous earth filter layer; the second support net is arranged in the activated carbon filter layer.

[0011] Preferably, the mesh number of the first support net is greater than the mesh number of the second support net.

[0012] Preferably, the mesh number of the first support net is 2 to 10 meshes; the mesh number of the second support net is 2 to 6 meshes.

[0013] Preferably, the filter frame is a hollow structure; the filter frame is provided with a liquid inlet; the liquid inlet is located between two filter plates; and a liquid outlet is provided on the periphery of the filter frame.

[0014] Preferably, the height of the side plate is 80-120 mm; the distance between the first support net and the side surface of the filter frame is 20-60 mm; and the distance between the second support net and the second support net is 20-40 mm.

[0015] Preferably, the support mesh is made of stainless steel.

[0016] At the same time, a plate-and-frame filter is also provided, comprising a filter unit and a filter tank as described above; the filter tank is provided with a liquid inlet pipe and a liquid outlet pipe; the liquid outlet pipe is connected to the filter frame.

[0017] Preferably, both the liquid inlet pipe and the liquid outlet pipe are provided with a check valve.

[0018] Compared with the existing technology, this solution has the following beneficial effects:

[0019] In the filter unit of this case, side plates are provided on the periphery of both sides of the filter plate, and the side plates enclose a receiving cavity. The filter medium is attached to the filter plate and forms a filter layer in the receiving cavity. During the formation of the filter layer, as the filter medium continues to adhere, the filter layer continues to thicken, so that the support net is wrapped in the filter layer. The side plates support the periphery of the filter layer and the support net strengthens the bonding strength between the filter medium inside the filter layer, thereby avoiding the filter medium from falling off the filter plate when the pressure is reduced or the machine is shut down, thereby avoiding the diatomaceous earth or activated carbon from falling off and requiring backwashing, which reduces production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the structure of the filtration unit of Example 1;

[0021] Figure 2 is a cross-sectional view of the filter unit of Example 1;

[0022] Figure 3 For Example 1 Figure 2 A magnified view of middle A;

[0023] Figure 4 2 is a cross-sectional view of the plate and frame filter of Example 2.

[0024] Wherein: filter frame 1; filter plate 2; side plate 3; accommodating chamber 4; diatomaceous earth filter layer 5; activated carbon filter layer 6; first support net 7; second support net 8; liquid inlet 9; liquid outlet 10; filter tank 11; liquid inlet pipe 12; liquid outlet pipe 13; check valve 14. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0026] Example 1

[0027] refer to Figure 1-3 A filter unit of a plate-and-frame filter comprises a filter frame 1; filter plates 2 are provided on both sides of the filter frame 1; side plates 3 extend from the periphery of the filter plates 2 in a direction away from the filter frame 1; the side plates 3 form a receiving cavity 4 for accommodating a filter medium; a filter layer is provided in the receiving cavity 4; and a support net is provided in the filter layer.

[0028] In this embodiment, filter plate 2 is a stainless steel filter cloth welded to filter frame 1. The coating process for the filter unit is as follows: a filter medium mixture is passed through the filter unit. The filter medium in the filter medium mixture adheres to filter plate 2 and is located within accommodating cavity 4, forming a filter layer. As the filter layer thickens, it wraps around the support mesh.

[0029] After the filter layer is fully formed, the electrolyte is transported to the plate and frame filter through the liquid inlet pipe 12. After the electrolyte is continuously introduced, the electrolyte pressure in the plate and frame filter increases, causing the electrolyte to be filtered through the filter layer. The filtered electrolyte flows from the liquid inlet 9 into the filter frame 1, then flows from the filter frame 1 into the liquid outlet pipe 13, and then flows back to the electrolytic cell, thus completing the filtration of the electrolyte.

[0030] It should be noted that the filter layer in the prior art is directly adhered to the filter plate by the pressure of the electrolyte delivery. When the electrolyte delivery pressure decreases or the machine is shut down, the filter layer easily falls off the filter plate 1, causing the filter layer to collapse, which requires a considerable amount of time to clean and re-form the filter layer. However, the support mesh of this solution can increase the internal bonding strength of the filter layer, preventing the filter medium from splitting in the absence of external pressure. The side panels 3 further support the filter layer, preventing the filter medium from separating from the accommodating cavity 4 and maintaining a stable attachment to the filter plate 2, thus playing a shaping role and preventing the filter layer from collapsing when the pressure decreases or the machine is shut down.

[0031] Preferably, the filter layer includes a diatomaceous earth filter layer 5 and an activated carbon filter layer 6 arranged in sequence along the direction away from the filter frame 1; the support net includes a first support net 7 and a second support net 8; the first support net 7 is arranged in the diatomaceous earth filter layer 5; the second support net 8 is arranged in the activated carbon filter layer 6.

[0032] In this embodiment, the filter media are diatomaceous earth and activated carbon. The specific application process of diatomaceous earth and activated carbon is as follows: the diatomaceous earth mixture is passed into the filter unit, and the diatomaceous earth in the diatomaceous earth mixture adheres to the filter plate 2 and is located in the accommodating cavity 4, forming a diatomaceous earth filter layer 5. As the diatomaceous earth filter layer 5 continues to thicken, the diatomaceous earth filter layer 5 wraps the first support mesh 7. After the diatomaceous earth filter layer 5 is completed, activated carbon powder is passed into it, and the activated carbon powder adheres to the surface of the diatomaceous earth filter layer 5 and is located in the accommodating cavity 4, forming an activated carbon filter layer 6. As the activated carbon filter layer 6 continues to thicken, the activated carbon filter layer 6 wraps the second support mesh 8. The structural strength of the diatomaceous earth filter layer 5 and the activated carbon filter layer 6 is enhanced by the side panels 3, the first support mesh 7, and the second support mesh 8.

[0033] Preferably, the mesh number of the first support net 7 is greater than the mesh number of the second support net 8 .

[0034] In this embodiment, the mesh number of the first support net 7 is larger than the mesh number of the second support net 8 , so that the diatomaceous earth can pass through the second support net 8 and enter the first support net 7 and the filter plate 2 .

[0035] Preferably, the mesh number of the first support net 7 is 2 to 10 meshes; the mesh number of the second support net 8 is 2 to 6 meshes.

[0036] In this embodiment, the mesh size of the first support mesh 7 is 8, and the mesh size of the second support mesh 8 is 4. The mesh sizes of the first support mesh 7 and the second support mesh 8 do not need to be set too high. Their purpose is to allow diatomaceous earth or activated carbon to pass through, and to enable the first support mesh 7 and the second support mesh 8 to form a skeleton in the diatomaceous earth filter layer 55 and the activated carbon filter layer 6, respectively, thereby improving the internal bonding strength of the diatomaceous earth filter layer 5 and the activated carbon filter layer 6.

[0037] Preferably, the filter frame 1 is a hollow structure; the filter frame 1 is provided with a liquid inlet 9; the liquid inlet 9 is located between the two filter plates 2; and a liquid outlet 10 is provided on the periphery of the filter frame 1.

[0038] In this embodiment, the electrolyte is input into the plate-and-frame filter, filtered through the activated carbon filter layer 6 and the diatomaceous earth filter layer 5, and then enters the filter frame 1 through the liquid inlet 9 and flows out through the liquid outlet 10. Impurities are adsorbed on the diatomaceous earth and activated carbon, thereby completing the filtration of the electrolyte.

[0039] Preferably, the height of the side plate 3 is 80-120 mm; the distance between the first support net 7 and the side surface of the filter frame 1 is 20-60 mm; the distance between the second support net 8 and the second support net 8 is 20-40 mm.

[0040] In this embodiment, the height of the side panels 3 is preferably 80 mm; the distance between the first support mesh 7 and the side of the filter frame 1 is preferably 20 mm; and the distance between the second support mesh 8 and the second support mesh 8 is preferably 40 mm. Because multiple filter units are provided in a plate-and-frame filter, this size arrangement ensures that the diatomaceous earth filter layer 5 and the activated carbon filter layer 6 are both contained within the side panels 3 when they are formed, and prevents interference between the filter units.

[0041] Preferably, the support mesh is made of stainless steel.

[0042] In this embodiment, the first support net 7 and the second support net 8 are both made of stainless steel to avoid contamination of the electrolyte.

[0043] Example 2

[0044] refer to Figure 4A plate and frame filter comprises a filter unit of the plate and frame filter as described in Example 1, and a filter tank 11; the filter tank 11 is provided with a liquid inlet pipe 12 and a liquid outlet pipe 13; the liquid outlet pipe 13 is connected to the filter frame 1.

[0045] Preferably, both the liquid inlet pipe 12 and the liquid outlet pipe 13 are provided with a check valve 14 .

[0046] In this embodiment, multiple filter units are arrayed within a filter tank 11. A liquid outlet pipe 13 is provided within the filter tank 11, communicating with the liquid outlet 10 of each filter frame 1. The liquid outlet pipe 13 extends beyond the filter tank 11 and communicates with an external electrolytic cell. External delivery equipment delivers electrolyte from the liquid inlet pipe 12 into the filter tank 11. After passing through the filter units, the electrolyte enters the liquid outlet 10 of the filter frame 1, enters the liquid outlet pipe 13, and flows to the external electrolytic cell.

[0047] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A filter unit of a plate-and-frame filter, comprising a filter frame; filter plates are provided on both sides of the filter frame; and Side plates extend from the periphery of the filter plate in a direction away from the filter frame; the side plates enclose a receiving cavity for receiving the filter medium; a filter layer is provided in the receiving cavity; and a support net is provided in the filter layer.

2. The filter unit of the plate and frame filter according to claim 1, characterized in that: The filter layer includes a diatomaceous earth filter layer and an activated carbon filter layer arranged in sequence in a direction away from the filter frame; the support net includes a first support net and a second support net; the first support net is arranged in the diatomaceous earth filter layer; The second support net is arranged in the activated carbon filter layer.

3. The filter unit of the plate-and-frame filter according to claim 2, characterized in that: The mesh number of the first supporting net is greater than the mesh number of the second supporting net.

4. The filter unit of the plate-and-frame filter according to claim 2, characterized in that: The mesh number of the first supporting net is 2 to 10 meshes; the mesh number of the second supporting net is 2 to 6 meshes.

5. The filter unit of the plate-and-frame filter according to claim 1, characterized in that: The filter frame is a hollow structure; the filter frame is provided with a liquid inlet; the liquid inlet is located between two filter plates; and a liquid outlet is provided on the periphery of the filter frame.

6. The filter unit of the plate-and-frame filter according to claim 2, characterized in that: The height of the side plate is 80-120 mm; the distance between the first support net and the side surface of the filter frame is 20-60 mm; the distance between the second support net and the second support net is 20-40 mm.

7. The filter unit of the plate-and-frame filter according to claim 1, characterized in that: The support net is made of stainless steel.

8. A plate-and-frame filter, characterized in that: It comprises a filter unit of the plate-and-frame filter according to any one of claims 1 to 7, and a filter tank; the filter tank is provided with a liquid inlet pipe and a liquid outlet pipe; the liquid outlet pipe is connected to the filter frame.

9. The plate-and-frame filter according to claim 8, characterized in that: The liquid inlet pipe and the liquid outlet pipe are both provided with check valves.

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