Filter plate structure of filter press

Abstract

A filter plate structure of a filter press belongs to the field of filter presses, and comprises a liquid outlet hole, a frame, a filter plate boss, a small bulge, a filter hole, a feed port, a filter plate body, a liquid outlet channel, filter cloth and a mounting handle, the liquid outlet holes are formed in the corners of the frame and can be communicated with the surface of the filter plate body through small holes formed in the frame or / and the filter plate body, and the small holes are liquid outlet channels; the frame is arranged at the periphery of the filter plate and is thicker than the filter plate body; the filter plate has the characteristics of reducing local stress concentration when the filter plate works, increasing the strength of the filter plate and prolonging the service life of the filter plate.

Description

Technical Field

[0001] This invention relates to the field of filter press equipment, and in particular to a filter plate structure that optimizes the filter plate structure design to reduce stress concentration caused by uneven pressure during the filtration process, thereby preventing filter plate failure. Background Technology

[0002] A filter press is a device that separates solid and liquid phases using pressure filtration. Its working principle involves feeding a solid-liquid mixture into the filter press via pressure conveying. The mixture enters the filter chambers formed between the filter plates. After passing through the filter cloth attached to the filter plates, the solid material remains in the filter chambers, while the liquid material passes through the filter cloth and exits to the liquid outlet channel of the filter plate, where it is collected by a liquid collection device. The solid material, also known as filter cake, is compressed and remains in the filter chambers, forming a filter cake. After the filter plates are opened, the cake is removed and placed for further processing. This completes the solid-liquid separation process. During the operation of the filter press, uneven material filling during the feeding stage often leads to pressure imbalance on both sides of the filter chambers. Although existing filter plate structures include supporting bosses to resist bending deformation of the filter plates under pressure difference, stress concentration still exists at the root of the bosses and the bottom of the slope of the sealing frame (see...). Figure 5 This can cause the bottom of the boss to fracture, especially in the area where the step connects to the slope of the boss, where stress peaks are easily formed. Practice has shown that when the pressure reaches 5 bar, the peak stress of conventional design can reach 5.5 N / mm². Long-term operation under this condition can easily lead to fatigue fracture, affecting the life of the equipment and production safety. Summary of the Invention

[0003] To address the aforementioned problems with existing filter press plate structures during practical use, this invention proposes a filter press plate structure that effectively reduces stress concentration at the root of the boss, thereby reducing fatigue fracture caused by stress concentration. The specific technical solution is as follows: A filter press plate structure, characterized in that the filter plate includes a liquid outlet hole, a frame, a filter plate boss, small protrusions, filter holes, a feed inlet, a filter plate body, a liquid outlet channel, filter cloth, and a mounting handle; the liquid outlet hole is located at the corner of the frame, allowing for easy access via the filter cloth located on the frame or / and the filter plate. The small holes on the plate body are connected to the surface of the filter plate body, and these small holes are liquid outlet channels; the frame is set around the perimeter of the filter plate, and its thickness is greater than that of the filter plate body; the filter plate protrusions are set on the filter plate body, which can increase the local thickness of the filter plate body, thereby increasing the strength of the filter plate body; the perimeter of the filter plate protrusions and the filter plate body are rounded; the small protrusions are set on the filter plate body and are located near the filter plate protrusions and the frame; the small protrusions form filter holes, which allow the liquid phase of the filter material to pass through them, and The liquid flows out of the filter plate through the outlet hole; the feed inlet is located on the filter plate body, in the middle of the filter plate body, and penetrates the thickness of the filter plate body; the filter plate body is located in the inner cavity of the frame and fills the inner cavity of the frame, and its thickness is less than the thickness of the frame; the junction of the filter plate body and the frame is a rounded transition; when two adjacent filter plates are joined together, a filtration space called a filter chamber is formed between the filter plate bodies of the two filter plates; the liquid outlet channel is located on the filter plate body or the frame, one end of which communicates with the inner cavity of the liquid outlet hole, and the other end of which communicates with the outer surface of the filter plate body, enabling the liquid to flow out of the filter plate body. The filtered liquid is transported from the filter plate body to the outlet cavity. The filter cloth is installed on the filter plate and covers the entire surface of the filter chamber, including the surface of the filter plate body, the surface of the feed inlet, and the surface of the joint between the filter plate body and the frame. It also covers the surface of the filter plate boss and the small protrusion. That is to say, the filtered medium can only exist on one side of the filter cloth and cannot enter the outlet hole on the filter plate around the filter cloth. The mounting handle is located on both sides of the outer frame and matches the filter plate mounting beam of the filter press, which can stack the filter plates on the filter plate mounting beam.

[0004] Furthermore, there is one or more liquid outlet holes.

[0005] Furthermore, the filter plate has multiple protrusions.

[0006] Furthermore, the filter plate protrusions are evenly arranged on the filter plate body.

[0007] Furthermore, there are multiple small protrusions arranged near the junction of the frame and the filter plate body, and located on the filter plate body.

[0008] Furthermore, the small protrusions are arranged in concentric circles around the filter plate boss, with the center of each concentric circle coinciding with or being close to the center of the filter plate boss.

[0009] Furthermore, the radius of the arc at the junction of the filter plate boss and the surface of the filter plate body is 60-200 mm.

[0010] Furthermore, the radius of the arc at the junction of the frame and the filter plate surface is 60-200 mm.

[0011] Beneficial effects

[0012] The beneficial effect of the present invention is that it can improve the stress concentration between the filter plate body, the filter plate frame and the filter plate bosses when the filter plate is in operation, enhance the overall strength of the filter plate and reduce filter plate damage. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the front structure of the filter plate.

[0014] Figure 2 This is an enlarged view of the filter plate boss and surrounding small protrusions.

[0015] Figure 3 This is a schematic diagram of the side cross-section structure.

[0016] Figure 4 This is an enlarged view of the filter plate boss and surrounding structure.

[0017] Figure 5 This is an enlarged structural diagram of the filter plate boss and nearby small bosses of an existing filter plate, along with a corresponding stress distribution diagram.

[0018] Figure 6 This is an enlarged view of the filter plate boss and nearby small bosses of the present invention, as well as a corresponding stress distribution diagram.

[0019] 1. Liquid outlet, 2. Frame, 3. Filter plate boss, 4. Small protrusion, 5. Feed inlet, 6. Filter plate body, 7. Liquid outlet channel, 8. Filter hole, 9. Stress distribution value corresponding to the filter hole, 10. Arc distribution at the junction of the filter plate boss and the filter plate body, 41. Inner ring small protrusion, 42. Middle small protrusion, 43. Outer small protrusion. Detailed Implementation

[0020] To better illustrate the technical solution of the present invention, specific embodiments of the present invention will now be further described in conjunction with the accompanying drawings, such as... Figure 13, 6; In this example, a filter plate material commonly used in the industry is selected as the filter plate material of this invention, and a sleeve-type filter cloth commonly used in the industry is selected as the filter cloth in this example, and a filter plate mounting handle commonly used in the industry is selected as the mounting handle in this example; In this example, four liquid outlet holes 1 are selected and respectively set at the four corners of the frame 2 of the filter plate. In practical applications, liquid outlet channels 7 can be set at one or more of the liquid outlet holes 1 to realize the discharge of liquid phase substances in the filtered substances; In this example, the frame 2 is set as The frame 2 is placed around the filter plate body 6, surrounding it. The thickness of the frame 2 is greater than the thickness of the filter plate body 6, and the junction with the filter plate body 6 uses a rounded transition with a radius of 60-200 mm. This reduces stress concentration and prevents cracking at the joint between the frame 2 and the filter plate body 6 due to stress concentration. A corresponding sealing structure is also set according to industry-standard methods to ensure a leak-proof seal when multiple filter plates are stacked. In this example, cylindrical (conical) filter plate bosses 3 are set on two surfaces of the filter plate body 6. Depending on the application and the shape of the filter plate, protrusions of other cross-sectional shapes can be used, evenly distributed in the middle of the filter plate body 6. In this example, a three-by-three matrix structure is selected. Furthermore, the joint between each filter plate protrusion 3 and the surface of the filter plate body 6 is connected by an arc with a radius of 60-200 mm to avoid stress concentration at the root of the protrusion 3. Simultaneously, around each filter plate protrusion 3, with the center of the protrusion 3 as the center, multiple small protrusions 4 are arranged, with a gap between each small protrusion 4 and its adjacent protrusions. The filter plate has multiple pores. In this example, to avoid additional stress concentration points, a rounded transition with a radius of 1-2 mm is used at the bottom of the pores. Simultaneously, the bottom of the pores is located above the outer surface of the filter plate body 6, meaning that a structure recessed into the surface of the filter plate body 6 is not used to avoid damaging the overall strength of the filter plate body. Furthermore, to balance the impact of the small protrusions 4 on the strength of the filter plate body 6, the small protrusions 4 are divided into inner ring small protrusions 41, middle small protrusions 42, and outer small protrusions 43 (e.g., ...). Figure 6 The filter plates 6 are arranged in different sizes, diameters, spacings, and layouts to make the stress on the filter plate body 6 more balanced during operation. A feed hole 5 is provided at the center of the filter plate body 6, and it is arranged according to the common structure and layout methods in this industry. In this example, the filter plate body 6 and the frame 2 are integrated into one structure. Several key factors are: 1. The thickness of the filter plate body 6 is less than or equal to the thickness of the frame 2; 2. The filter plate body 6 is located in the middle of the thickness of the frame 2 in the thickness direction; 3. The joint between the frame 2 and the filter plate body 6 is transitioned by an arc; 4. Filter plate protrusions 3 are provided on both sides of the filter plate body 6. This completes the implementation of the present invention.

[0021] In application, filter cloth is installed on each filter plate according to the industry's common method. In this example, the sleeve-type filter cloth used has a filter cloth cylinder connecting the filter cloths on both sides at the feed inlet 5. Multiple filter plates are stacked and installed on the filter press, connected to the filter press by the installation handle, and the stacked filter plates are pressed together by a hydraulic cylinder. One end of the liquid outlet 1 is connected to the filtrate collection pipe (the liquid outlets 1 on multiple filter plates are combined to form a hollow pipe). One end of the feed inlet 5 is connected to the feed pump. The filtered medium is sent into the feed inlet 5 under high pressure by the feed pump, entering the filter plate group from one end of the stacked filter plate group, and initially entering the first filter chamber formed between the first and second filter plates. Due to the pressure, the filtered medium is squeezed onto the filter cloth on the surface of the filter plate. Filter cloths of different densities are selected according to the required filtration accuracy. Liquid substances in the filtered medium pass through the filter cloth, enter the surface of the filter plate body 6, and flow into the liquid outlet hole from the liquid outlet channel 7, while solid substances are separated by the filter cloth. The filtered medium is separated and remains in the filter chamber. Under the pressure of the feed pump, the filtered medium enters each filter chamber of the filter plate assembly in sequence, completing the same process. When the liquid content in the filtered medium reaches the set value, the hydraulic cylinder releases the stacked filter plate assembly, and the filter plate pulling device pulls the stacked filter plates apart. The solid material (filter cake) in each filter chamber is taken out, completing one working cycle. Since the feed pump sends the filtered medium into the filter chamber at different speeds and pressures, and the concentration of the filtered medium is also uneven as the filtration process proceeds, different forces will be generated on the filter plates. If the structure of the filter plate is subjected to this unbalanced force, local stress concentration will occur, which will quickly damage the filter plate structure, causing production stoppage, equipment damage, or other accidents. This invention effectively reduces the occurrence of local stress concentration. In practice, test results have shown that after adopting this structure, the peak value of local stress concentration can be reduced by more than 40%, achieving good results.

Claims

1. A filter plate structure for a filter press, characterized in that: The filter plate includes a liquid outlet, a frame, a filter plate boss, small protrusions, filter holes, a feed inlet, a filter plate body, a liquid outlet channel, a filter cloth, and a mounting handle. The liquid outlet is located at the corner of the frame and communicates with the surface of the filter plate body through small holes on the frame and / or the filter plate body; these small holes serve as the liquid outlet channel. The frame is located around the perimeter of the filter plate and its thickness is greater than that of the filter plate body. The filter plate boss is located on the filter plate body, increasing the local thickness of the filter plate body and thus increasing its strength. The perimeter of the filter plate boss and the filter plate body have a rounded transition. The small protrusions are located on the filter plate body, near the filter plate boss and the frame. Filter holes are formed between the small protrusions, allowing the liquid phase of the filter material to pass through and collect at the liquid outlet, flowing out of the filter plate. The feed inlet is located on the filter plate body, in the middle of the filter plate body, and penetrates the thickness of the filter plate body. The filter plate is set inside the frame cavity and fills the frame cavity, with a thickness less than the frame thickness; the junction between the filter plate body and the frame is a rounded transition; when two adjacent filter plates are joined together, a filtration space called a filter chamber is formed between the filter plate bodies; the liquid outlet channel is set on the filter plate body or the frame, with one end communicating with the inner cavity of the liquid outlet hole and the other end communicating with the outer surface of the filter plate body, which can transport the liquid material filtered by the filter cloth from the filter plate body to the inner cavity of the liquid outlet hole; the filter cloth is installed on the filter plate and can cover the entire surface of the filter chamber, including the surface of the filter plate body, the surface of the feed inlet, and the surface of the joint between the filter plate body and the frame, while also covering the surface of the filter plate boss and the small protrusion surface; that is to say, the filtered medium can only exist on one side of the filter cloth and cannot enter the liquid outlet hole on the filter plate around the filter cloth; the mounting handle is set on both sides of the outer frame and matches the filter plate mounting beam of the filter press, which can stack the filter plates on the filter plate mounting beam.

2. The filter plate structure of a filter press according to claim 1, characterized in that: There is one or more liquid outlet holes.

3. The filter plate structure of a filter press according to claim 1, characterized in that: The filter plate has multiple bosses.

4. The filter plate structure of a filter press according to claim 3, characterized in that: The filter plate protrusions are evenly arranged on the filter plate body.

5. The filter plate structure of a filter press according to claim 1, characterized in that: There are multiple small protrusions, which are arranged near the junction of the frame and the filter plate body and are located on the filter plate body.

6. The filter plate structure of a filter press according to claim 1, characterized in that: The small protrusions are arranged in concentric circles around the filter plate boss, and the center of the concentric circles coincides with or is close to the center of the filter plate boss.

7. The filter plate structure of a filter press according to claim 1, characterized in that: The radius of the arc at the junction of the filter plate boss and the surface of the filter plate body is 60-200 mm.

8. The filter plate structure of a filter press according to claim 1, characterized in that: The radius of the arc at the junction of the frame and the filter plate surface is 60-200 mm.

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