High-pressure resistant filter plate and filter cloth inlay method thereof

Abstract

The present invention belongs to the technical field of filter presses, and particularly relates to a high-pressure resistant filter plate and a filter cloth embedding method thereof. The high-pressure resistant filter plate comprises a filter plate body, the filter plate body comprising a sealing frame portion (11), a pressing cavity portion (12), and a medium channel (13). A filter cloth (20) is fixed to the filter plate body via a filter cloth fixing groove (30). A sealing rubber strip (50) is embedded in the filter cloth fixing groove (30). The filter cloth fixing groove (30) is provided with at least two circles. The space covered by the filter cloth (20) between adjacent filter cloth fixing grooves (30) forms a buffer space (40). The edge of the filter cloth (20) is located outside the filter cloth fixing groove (30) or inside the filter cloth fixing groove (30). The present invention has the advantages of simple structure and obvious effect. Only one more filter cloth fixing groove is opened, and the filter cloth embedding procedure is simple. Experiments have found that the filter cloth can withstand a pressing pressure of about 10 MPa.

Description

Technical Field

[0001] The invention belongs to the technical field of B01D25 / 12 filter presses, and in particular relates to a high-pressure resistant filter plate and a filter cloth embedding method thereof. Background Art

[0002] A filter press is a machine used for solid-liquid separation, utilizing the compression chamber formed between adjacent filter plates to separate mud and water. The greater the pressure applied during pressing, the greater the reduction in the material's moisture content. Increasing the pressing pressure is a key way to improve filter press efficiency. While typical pressing pressures range from 1-3 MPa, high-drying presses can reach pressures of around 10 MPa.

[0003] In the prior art, filter cloths in filter presses are primarily secured using sleeve and inlay methods. Filter plates suitable for high-pressure pressing are typically made of metal, otherwise they are susceptible to deformation and failure under high pressure. Sleeve-type securing of filter cloths is susceptible to damage due to being sandwiched between the metal pressing surfaces. The inlay-type securing method involves creating a filter cloth securing groove in the filter plate body, inserting a sealing strip into the groove, and pressing the edge of the filter cloth against the groove. Technical solutions disclosed in Chinese patent documents CN 212523151 U and CN 112604332 A both employ this method. However, this method is not suitable for high-pressure pressing. Experiments conducted by the applicant have shown that when the pressing pressure reaches approximately 4 MPa, muddy water easily enters the filter cloth through the filter cloth securing groove. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a high-pressure resistant filter plate so that when the filter cloth is fixed in an inlaid manner and the muddy water cannot reach the other side of the filter cloth through the fixing groove under a squeezing pressure of about 10MPa.

[0005] In order to achieve the above object, the technical solution of the present invention is as follows:

[0006] The high-pressure resistant filter plate includes a filter plate body, which includes a sealing frame portion, a pressing cavity portion, and a medium channel. A filter cloth is fixed on the filter plate body through a filter cloth fixing groove, and a sealing strip is embedded in the filter cloth fixing groove. The filter cloth fixing groove is provided with at least two circles, and the space covered by the filter cloth between adjacent filter cloth fixing grooves forms a buffer space. The edge of the filter cloth is located outside the filter cloth fixing groove or inside the filter cloth fixing groove.

[0007] The inventive concept of this invention is to utilize at least two rings of filter cloth fixing grooves to secure the filter cloth edge. This means that muddy water must pass through at least two rings of filter cloth fixing grooves as it passes around the filter cloth edge from one side to the other. On either side of the outermost ring of filter cloth fixing grooves, high-pressure muddy water directly contacts one side, while the filter cloth blocks the other side. Furthermore, due to the filter cloth blocking the outer ring, the pressure inside the filter cloth fixing groove is relatively low. Consequently, under higher pressure, muddy water can potentially enter the inner side of the filter cloth fixing groove, allowing mud to enter the buffer space. The second ring of filter cloth fixing grooves is covered on both sides by filter cloth, ensuring that the pressure on both sides is essentially equal. This eliminates the pressure differential within the buffer space from sufficient to force muddy water through the second ring of filter cloth fixing grooves. The presence of a third ring of filter cloth fixing grooves further reduces the likelihood of muddy water permeating.

[0008] As an improvement, the edge of the filter cloth is wrapped around the sealing strip in the outer filter cloth fixing groove and then hidden inside the inner filter cloth fixing groove. If the edge of the filter cloth is not hidden, it tends to be lifted up when under pressure, making it easier for muddy water to enter the gap between the filter cloth fixing groove and the filter cloth. In the present application, the edge of the filter cloth is wrapped around the sealing strip in the outer filter cloth fixing groove and then hidden inside the inner filter cloth fixing groove, so that the buffer space is covered with two layers of filter cloth, while other areas are covered with only one layer of filter cloth, so that the pressure in the buffer space will be relatively lower, reducing the possibility of muddy water in the buffer space further passing through the second filter cloth fixing groove.

[0009] As an improvement, the edge of the filter cloth is located inside the outermost filter cloth fixing groove. This solution is a variation, so that the edge of the filter cloth is no longer in direct contact with the high-pressure muddy water.

[0010] As an improvement, the filter cloth fixing groove is a dovetail groove or a spherical groove.

[0011] As an improvement, the filter cloth fixing groove is located at the edge of the pressing chamber.

[0012] As an improvement, the medium channels are all located in the sealed frame portion. The squeezed material channel and the high-pressure medium channel are all located in the sealed frame portion. Due to the high working pressure, the filter plate with the middle opening is prone to deformation.

[0013] As an improvement, the pressing chamber is octagonal, and the side of the octagon corresponding to the medium channel is arc-shaped and concave to increase the thickness between the edge of the pressing chamber and the medium channel, so as to reduce the impact of working pressure on the medium channel.

[0014] The present invention also provides a filter cloth inlay method for a high-pressure resistant filter plate, wherein the edge of the filter cloth is fixed to the filter plate body through a filter cloth fixing groove, and a sealing strip is embedded in the filter cloth fixing groove. The filter cloth fixing groove is provided with at least two circles, and the space covered by the filter cloth between adjacent filter cloth fixing grooves forms a buffer space, and the edge of the filter cloth is located outside the filter cloth fixing groove or inside the filter cloth fixing groove.

[0015] As an improvement, the filter cloth inlaying includes the following steps: (1) laying the filter cloth on the filter plate and covering all the filter cloth fixing grooves; (2) inlaying the outermost filter cloth fixing grooves with sealing strips to fix the filter cloth in the outermost filter cloth fixing grooves; (3) folding the edge of the filter cloth so that the edge of the filter cloth is located above the inner filter cloth fixing grooves; (4) inlaying the inner filter cloth fixing grooves with sealing strips to seal the edge of the filter cloth in the inner filter cloth fixing grooves.

[0016] Another filter cloth inlay method is as follows: (1) the filter cloth is laid on the filter plate and covers all the filter cloth fixing grooves; (2) a sealing strip is used to inlay the filter cloth fixing groove on the inner side and fix the filter cloth in the filter cloth fixing groove on the inner side; (3) the edge of the filter cloth is pulled and retracted so that the edge of the filter cloth is located on the outer filter cloth fixing groove; (4) a sealing strip is used to inlay the filter cloth fixing groove on the outer side and seal the edge of the filter cloth in the filter cloth fixing groove on the outer side.

[0017] In summary, the present invention has the advantages of simple structure and obvious effect, only one more filter cloth fixing groove is opened, and the filter cloth is easily embedded. Experiments have shown that it can withstand a squeezing pressure of about 10 MPa. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the front view of the present invention;

[0019] Figure 2 for Figure 1 Cross-sectional view along the AA axis;

[0020] Figure 3 for Figure 2 The enlarged view of the middle part A shows the structure of Example 1;

[0021] Figure 4 for Figure 2 The enlarged view of the middle part A shows the structure of Example 2;

[0022] Figure 5 for Figure 4 Assembly diagram;

[0023] Figure 6 for Figure 2 The enlarged view of the middle part A shows the structure of Example 3;

[0024] Figure 7 for Figure 6 Assembly diagram;

[0025] Figure 8 This is a schematic diagram of high-pressure muddy water flowing from one side of the filter cloth through the filter cloth fixing groove to the other side in the prior art, and the dotted line represents the movement path of the high-pressure muddy water.

[0026] In the figure: 11, sealing frame portion; 12, pressing chamber portion; 13, medium channel; 20, filter cloth; 30, filter cloth fixing groove; 40, buffer space; 50, sealing strip. DETAILED DESCRIPTION

[0027] Example 1

[0028] like Figure 1-3 As shown, the high-pressure filter plate of the present invention includes a square filter plate body made of metal, surrounded by a sealed frame portion 11, and a pressing chamber portion 12 in the middle. Various media channels 13 are provided in the sealed frame portion 11. The media channels 13 include a press material inlet located at the upper edge of the press chamber portion 12. The top feeding method facilitates the rapid filling of the press chamber 12 with material.

[0029] The press chamber 12 is located in the center of the filter plate body. It lacks the various media channels 13 to enhance structural strength. The press chamber 12 is octagonal, with the sides corresponding to the media channels 13 curved and concave to increase the thickness between the edges of the press chamber 12 and the media channels 13.

[0030] The filter cloth 20 is fixed on the filter plate body through the filter cloth fixing groove 30 , and the filter cloth fixing groove 30 is located at the edge of the pressing chamber 12 . Figure 8 In the prior art, the filter cloth and filter cloth fixing grooves are designed to work together. Under high pressure, muddy water flows from one side of the filter cloth through the filter cloth fixing grooves 30 to the other side. This solution replaces the filter cloth fixing grooves 30 with two circles. The space between adjacent filter cloth fixing grooves 30, covered by the filter cloth 20, forms a buffer space 40. Because both sides of the second filter cloth fixing grooves 30 are covered by filter cloth 20, the pressure on both sides of the second filter cloth fixing grooves 30 is essentially the same, making it difficult to generate a sufficient pressure differential within the buffer space 40 to force the muddy water in the buffer space 40 through the second filter cloth fixing grooves 30.

[0031] The cross section of the filter cloth fixing groove 30 can be a dovetail groove or a spherical groove, and a sealing strip 50 is embedded in the filter cloth fixing groove 30. In this embodiment, the edge of the filter cloth 20 is located outside the filter cloth fixing groove 30.

[0032] Example 2

[0033] like Figure 4-5As shown, Example 2 is the most preferred embodiment. In this embodiment, the edge of the filter cloth 20 is wrapped around the sealing strip 50 located in the outer filter cloth fixing groove 30 and then hidden inside the inner filter cloth fixing groove 30. The filter cloth embedding method includes the following steps:

[0034] (1) Lay the filter cloth on the filter plate and cover all the filter cloth fixing grooves;

[0035] (2) Use sealing strips to inlay the outermost filter cloth fixing groove and fix the filter cloth in the outermost filter cloth fixing groove;

[0036] (3) Fold the edge of the filter cloth so that the edge of the filter cloth is located above the inner filter cloth fixing groove;

[0037] (4) Use a sealing strip to embed the inner filter cloth fixing groove and seal the edge of the filter cloth inside the inner filter cloth fixing groove.

[0038] Example 3

[0039] like Figure 6-7 As shown, the difference between Example 3 and Example 1 is that the edge of the filter cloth 20 is located inside the outermost filter cloth fixing groove 30. In this embodiment, the filter cloth inlay method includes the following steps:

[0040] (1) Lay the filter cloth on the filter plate and cover all the filter cloth fixing grooves;

[0041] (2) Use a sealing strip to embed the filter cloth fixing groove on the inner side and fix the filter cloth in the filter cloth fixing groove on the inner side;

[0042] (3) The edge of the filter cloth retracts after being pulled so that the edge of the filter cloth is located above the outer filter cloth fixing groove;

[0043] (4) Use sealing strips to embed the outer filter cloth fixing groove and seal the edge of the filter cloth inside the outer filter cloth fixing groove.

Claims

1. A high-pressure filter plate, comprising a filter plate body, the filter plate body comprising a sealing frame portion (11), a pressing cavity portion (12), and a medium channel (13), a filter cloth (20) being fixed to the filter plate body via a filter cloth fixing groove (30), a sealing rubber strip (50) being embedded in the filter cloth fixing groove (30), and characterized in that: The filter cloth fixing groove (30) is provided with at least two circles. The filter cloth fixing groove (30) is located at the edge of the pressing chamber (12). The filter cloth (20) is sealed inside the filter cloth fixing groove (30) by the sealing strip (50) on all sides. The space between adjacent filter cloth fixing grooves (30) and covered by the filter cloth (20) forms a buffer space (40) for accommodating filter mud. The edge of the filter cloth (20) is located inside the filter cloth fixing groove (30).

2. The high pressure filter plate according to claim 1, characterized in that: The edge of the filter cloth (20) is wrapped around the sealing strip (50) located in the outer filter cloth fixing groove (30) and is then hidden inside the inner filter cloth fixing groove (30).

3. The high pressure resistant filter plate according to claim 1, characterized in that: The edge of the filter cloth (20) is located inside the outermost filter cloth fixing groove (30).

4. The high pressure resistant filter plate according to claim 1, characterized in that: The filter cloth fixing groove (30) is a dovetail groove or a spherical groove.

5. The high pressure resistant filter plate according to claim 1, characterized in that: The medium channels (13) are all located in the sealing frame portion (11).

6. The high pressure resistant filter plate according to claim 5, characterized in that: The pressing chamber (12) is octagonal, and the side of the octagon corresponding to the medium channel (13) is arc-shaped and concave to increase the thickness between the edge of the pressing chamber (12) and the medium channel (13).

7. The filter cloth inlay method of the high-pressure resistant filter plate is characterized in that the edge of the filter cloth is fixed to the filter plate body through the filter cloth fixing groove, and the sealing strip is embedded in the filter cloth fixing groove. The filter cloth fixing groove is provided with at least two circles, and the filter cloth fixing groove is opened at the edge of the pressing chamber. The filter cloth is sealed inside the filter cloth fixing groove by sealing strips on all sides. The space covered by the filter cloth between adjacent filter cloth fixing grooves forms a buffer space for accommodating filter mud, and the edge of the filter cloth is located inside the filter cloth fixing groove.

8. The filter cloth embedding method for a high-pressure filter plate according to claim 7, wherein: The method comprises the following steps: (1) laying the filter cloth on the filter plate and covering all the filter cloth fixing grooves; (2) inserting the outermost filter cloth fixing grooves with sealing strips to fix the filter cloth in the outermost filter cloth fixing grooves; (3) folding the edge of the filter cloth so that the edge of the filter cloth is located above the inner filter cloth fixing grooves; (4) inserting the inner filter cloth fixing grooves with sealing strips to seal the edge of the filter cloth in the inner filter cloth fixing grooves.

9. The filter cloth embedding method for a high-pressure filter plate according to claim 7, wherein: The method comprises the following steps: (1) laying the filter cloth on the filter plate and covering all the filter cloth fixing grooves; (2) embedding the filter cloth fixing grooves on the inner side with a sealing strip and fixing the filter cloth in the inner filter cloth fixing grooves; (3) the edge of the filter cloth is pulled and then retracted so that the edge of the filter cloth is located above the outer filter cloth fixing grooves; (4) embedding the outer filter cloth fixing grooves with a sealing strip and sealing the edge of the filter cloth in the outer filter cloth fixing grooves.

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