A diaphragm filter plate of filter press with flow channel membrane

Abstract

The present invention provides a diaphragm filter plate of a filter press with a flow channel membrane, comprising a core plate, a pressing diaphragm, and a filter cloth. The flow channel membrane is supported between the pressing diaphragm and the filter cloth, and a plurality of protrusions are provided on the side of the flow channel membrane facing the filter cloth, and small through holes are provided between adjacent protrusions; a main flow channel connected to the main channel is formed between the flow channel membrane and the pressing diaphragm. Since the aperture size of the small through holes provided on the flow channel membrane is much larger than the filter holes on the filter cloth, the flow channel membrane can maintain a certain rigidity, so that the main flow channel inside it can always remain unobstructed. In this way, during filtering and squeezing, the filtering and squeezing channels can always remain unobstructed, the resistance of the filtrate is small, and the distribution is uniform, which greatly improves the filtering effect and the squeezing effect. At the same time, the main flow channel can be reversed to pass high-pressure fluid, so that the filter press has a flushing and drying function, and the flushing and drying channels will not be blocked, and the flushing and drying effect is good.

Description

Technical Field

[0001] The invention relates to the technical field of filter presses, in particular to a filter press diaphragm filter plate with a flow channel membrane. The filter press using the filter plate has the functions of flushing and drying, and the flushing and drying effects are good. Background Art

[0002] Filter pressing separation is a commonly used solid-liquid separation technology. In a traditional filter press, multiple filter plates are juxtaposed between the fixed end and the movable end of the filter press in a movable manner, and the movable end is moved by means of a hydraulic cylinder, so that all the filter plates are pressed together, thereby forming a closed filter chamber between the filter plates. Then the slurry is pumped into the filter chamber by a feed pump for solid-liquid separation. Solid-liquid separation is usually divided into filter pressing, air blowing dehydration, and unloading steps. In the filter pressing step, after the closed filter chamber is formed, the slurry is pressurized and poured into the filter chamber from the feed inlet. With the help of the filter cloth set in the filter chamber, the solid components in the slurry are retained in the filter chamber, while the liquid components flow out from the outlets of each filter chamber through the filter cloth. Slurry pouring is usually high-pressure pouring. As the pouring proceeds, the proportion of solid components in the filter chamber becomes larger and larger, and finally fills the entire filter chamber to form a filter cake. After the solid components fill the filter chamber to form a filter cake, the material injection is stopped. Then, air blowing dehydration is performed. In the air-blowing dehydration step, compressed air is blown into the filter cake to replace air and water, thereby removing the moisture in the filter cake. In the unloading step, all the filter chambers are opened step by step with the help of the hydraulic cylinder of the filter press, and the filter cake falls down with the help of gravity, thus completing the unloading.

[0003] However, for some materials that are difficult to dehydrate, such as metal minerals, tailings, and clay, filter pressing dehydration and air blowing dehydration alone cannot meet the requirements of lower moisture content. A new device and a new process using diaphragm pressing dehydration have emerged (such as the plate for filter press, filter press, use of filter press, and filter press cleaning method disclosed in Chinese patent CN108786201). In the current mainstream design of a chamber filter press with a pressing diaphragm, two filter plates with different structures are installed alternately. One is a filter plate with a feed pipe. The main body of the filter plate is made of steel plate. Modified polyethylene plastic lining plates with vertical grooves are installed on both sides of the steel plate. The grooves are used to smoothly guide the filtrate water into the drain pipe at the bottom of the filter plate for outflow; the other is called a diaphragm filter plate. The main body of the filter plate is also a steel plate, and elastic rubber pressing diaphragms are installed on both sides of the steel plate. Special filter cloths are hung on both sides of the two filter plates; on the side of the rubber diaphragm facing the filter chamber, there are densely arranged small bosses to facilitate the filtered filtrate water to flow into the drainage pipe at the bottom of the filter plate. During the operation of the filter press, the two filter plates arranged alternately are pressed together to form a filter chamber between adjacent filter plates. When the filtered material fills the filter chamber, high-pressure air is blown between the diaphragm of the diaphragm filter plate and the filter plate body to deform the rubber diaphragm, squeeze the filter cake (i.e. the filtered material in the filter chamber), squeeze out the excess water in the filter cake, and make the filter cake meet the requirements of lower moisture content.

[0004] As can be seen from the above, filter cloth is an indispensable and important component in the filter press. However, the filter cloth is easy to deform, thus blocking the filter press flow channel or the flow channel of air dehydration, greatly affecting the filtering or dehydration effect. Taking the diaphragm filter plate as an example, the small bosses form a channel for the filtrate to flow, and the filter cloth is easily embedded between the small bosses under the action of pressure, thereby blocking the filter press flow channel and affecting the filtering effect. When air dehydration is performed, the flow channel of the high-pressure gas is also blocked, affecting the effect of air dehydration. Therefore, the current filter press has low efficiency and poor effect due to the frequent blockage of the flow channel.

[0005] Even if the filter cloth is replaced with other materials, the filter holes on the filter cloth and filter cloth substitutes are very small because the volume of the solid particles to be separated is often small. It is precisely because of these large numbers of tiny filter holes that the rigidity of the filter cloth and filter cloth substitutes is poor. No matter what material is used, it is easy to deform, and then block the flow channel, causing the above problems to still exist.

[0006] In addition, current filter presses generally do not have the function of flushing and drying filter cakes or filter cloths (some filter cakes containing active ingredients need to be flushed multiple times to fully recover the active ingredients). When filter cakes and filter cloths need to be flushed and dried, a reverse flow channel is often set to allow high-pressure liquid and gas to enter between the filter cloth and the diaphragm for flushing or drying. From the above analysis, it can be seen that the filter cloth will be embedded between the small bosses, which obviously blocks the flushing and drying channels, thereby affecting the flushing and drying effect of the filter cake and filter cloth. Therefore, current filter presses often do not have flushing and drying functions, and even if they have such functions, the flushing and drying effects are very poor.

[0007] Finally, since the filter cloth is easily embedded between the small bosses, the moisture content of the filter cake will be uneven, the filter cake will easily collapse, affecting the process of the filter cake falling by gravity, and the unloading cannot be completed. Summary of the invention

[0008] The object of the present invention is to provide a filter press diaphragm filter plate with a flow channel membrane, wherein the flow channel membrane is supported between the pressing diaphragm and the filter cloth, so that the filtering flow channel and the flushing and drying flow channel are always kept unobstructed, integrating the filtering, pressing, drying and flushing functions in one, and having a good use effect.

[0009] In order to achieve the above-mentioned purpose, the present invention provides a filter press diaphragm filter plate with a flow channel membrane, including a core plate, a pressing diaphragm, and a filter cloth. The flow channel membrane is supported between the pressing diaphragm and the filter cloth, and the flow channel membrane is provided with a plurality of protrusions on the side facing the filter cloth, and small through holes are also opened between adjacent protrusions; a main flow channel connected to the main channel is formed between the flow channel membrane and the pressing diaphragm. Since the aperture size of the small through holes opened on the flow channel membrane is much larger than the filter holes on the filter cloth, the flow channel membrane can maintain a certain rigidity, so that the main flow channel inside it can always remain unobstructed. In this way, during filtering and squeezing, the filtering and squeezing channels can always remain unobstructed, the resistance of the filtrate is small, and the distribution is uniform, which greatly improves the filtering effect and the squeezing effect. At the same time, the main flow channel can be allowed to reversely pass high-pressure fluid, so that the filter press has a flushing and drying function, and the flushing and drying channels will not be blocked, and the flushing and drying effect is good.

[0010] Preferably, a squeezing cavity is formed between the squeezing diaphragm and the core plate, and the squeezing cavity is connected to the high-pressure fluid inlet. When the high-pressure fluid is introduced into the squeezing cavity, the squeezing diaphragm bulges and presses the filter cake to play a squeezing role.

[0011] Preferably, a plurality of small bosses are provided on the surface of the squeeze diaphragm facing the flow channel membrane. The small bosses can be supported on the inner side of the flow channel membrane to further keep the main flow channel unobstructed. At the same time, the small bosses can also enhance the squeezing effect on the filter cake.

[0012] Preferably, the flow channel membrane has one or more layers. When the flow channel membrane has two or more layers, a secondary flow channel is formed between two adjacent flow channel membranes, and the secondary flow channel is connected to the main flow channel. In this way, not only can the main flow channel be further kept unobstructed, but also the combination of multiple flow channel membranes can also increase strength and improve service life.

[0013] The upper ends of the flow channel membrane, the squeeze membrane, the filter cloth and the core plate are fixed together, and the main channel is formed by splicing large through holes opened in the flow channel membrane, the squeeze membrane, the filter cloth and the core plate, so that it is easy to process and assemble.

[0014] As described above, the present invention relates to a filter press diaphragm filter plate with a flow channel membrane, which has the following beneficial effects:

[0015] 1) The filtration channel can always remain unobstructed, the filtrate resistance is small and evenly distributed, which can ensure the filtration and pressing effects of the filter press.

[0016] 2) By passing high-pressure gas or liquid in the reverse direction of the main channel, the filter cake and filter cloth can be flushed and dried, so that the filter press has the function of flushing and drying. Moreover, since the main channel can always remain unobstructed, the flushing and drying effect is good.

[0017] 3) Since the filtration channel is always kept unobstructed, the moisture content of the filter cake is uniform, its structure is compact, not easy to collapse, the material is dropped smoothly, and the work efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 The figure is a schematic diagram of the use principle of the present invention.

[0020] Description of reference numerals:

[0021] Core plate 1; high-pressure fluid inlet 11; flow channel membrane 2; support protrusion 21; small through hole 22; filter cloth 3; main flow channel 4; main channel 5; squeezing diaphragm 6; squeezing chamber 7; small protrusion 8; filter cake 9. DETAILED DESCRIPTION

[0022] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0023] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of the relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0024] like Figure 1 , Figure 2 As shown, a diaphragm filter plate of a filter press with a flow channel membrane of the present invention comprises a core plate 1, a pressing diaphragm 6, and a filter cloth 3. A plurality of small bosses 8 are provided on the surface of the pressing diaphragm 6 facing the flow channel membrane 2. A pressing cavity 7 is formed between the pressing diaphragm 6 and the core plate 1, and the pressing cavity 7 is connected to the high-pressure fluid inlet 11. The flow channel membrane 2 is supported between the pressing diaphragm 6 and the filter cloth 3, and a plurality of support protrusions 21 are provided on the side of the flow channel membrane 2 facing the filter cloth, and small through holes 22 are also opened between adjacent support protrusions 21. The support protrusions 21 play a role in supporting the filter cloth 3, and can also enhance the effect of squeezing the filter cake. The small through holes 22 allow the filtrate collected between the support protrusions 21 to flow smoothly to the main channel 4. The small through holes 22 are used to pass compressed air, filtrate, and flushing liquid. A main channel 4 connected to the main channel 5 is formed between the flow channel membrane 2 and the pressing diaphragm 6. The flow channel membrane 2, the squeezing diaphragm 6, the filter cloth 3, and the upper end of the core plate 1 are fixed together, and the main channel 5 is formed by splicing large through holes opened in the flow channel membrane 2, the squeezing diaphragm 6, the filter cloth 3, and the core plate 1 respectively.

[0025] The flow channel membrane 2 may have more than two layers, and a secondary flow channel is formed between two adjacent flow channel membranes 2 , and the secondary flow channel is communicated with the main flow channel 4 .

[0026] The connection between the flow channel membrane 2, the squeeze diaphragm 6 and the core plate 1 in the present invention can be fixed by hot melting, mechanical fastening, inlaying and the like. The flow channel membrane 2, the squeeze diaphragm 6 and the core plate 1 described in the present invention can be obtained by pressing, injection molding, mechanical processing and the like. The flow channel membrane 2 and the squeeze diaphragm 6 described in the present invention can be arranged asymmetrically relative to the core plate. The flow channel membrane 2 and the core plate 1 described in this embodiment can be made of plastic, rubber, wood, metal and the like.

[0027] When the filter plate of the present invention is used in a filter press, the principle is as follows Figure 2As shown, the solid arrows in the figure represent the flow direction of the suspension, and the hollow arrows represent the flushing and drying direction. The suspension enters the filter chamber through the feed port. As the feed pressure gradually increases, the filtrate penetrates the filter cloth 3 and enters the narrow space between the flow channel membrane 2 and the filter cloth 3. Since the liquid flow will preferentially flow out from the place with small resistance, most of the filtrate passes through the small through-holes 22 of the flow channel membrane 2, enters the main flow channel 4 between the flow channel membrane 2 and the pressing diaphragm 6, and flows to the main channel 5 for discharge; a small amount of filtrate flows through the narrow space flow channel between the flow channel membrane 2 and the pressing diaphragm 6, and flows into the liquid outlet channel (that is, the conventional liquid outlet channel of the existing filter plate). Solid particles accumulate to form filter cake 9. As the suspension continues to enter the filter chamber, the filter cake 9 fills the filter chamber and the filtration ends. Then separate the filter plates, and the filter cake 9 can fall by its own gravity. Then combine the filter plates together for the next filter press.

[0028] In order to further reduce the moisture content of the filter cake, compressed air is introduced into the main channel 4 through the main channel 5 to fill the entire space. At this time, the outlet of the conventional liquid outlet channel of this filter plate is closed. As the pressure increases, the compressed air can only enter through the small through hole 22 on the flow channel membrane 2, penetrate the filter cloth 3 and the filter cake 9 in the reverse direction, enter the channel of the adjacent filter plate and be discharged, replacing part of the water inside the filter cake 9. The filtrate flows in the same direction as the above-mentioned filtering process. This is the air-blowing dehydration process. Since the main channel 4 of the present invention can always remain unobstructed, the air-blowing dehydration effect is good and the efficiency is high.

[0029] If flushing and drying are required, high-pressure liquid or high-temperature gas can be introduced in the reverse direction. Since the main channel can always remain unobstructed, the entire filter cake layer is blown evenly without dead corners or short circuits. Obviously, the flushing and drying effects are good and the efficiency is high. When flushing the filter cake 9, the flushing liquid flows in the opposite direction to the filtrate of the filtering operation. If necessary, alternating two-way flushing can be achieved by switching the valve in the external pipeline. Since the flushing liquid has a small flow resistance and is evenly distributed, the flushing time is shorter and the flushing liquid is significantly saved.

[0030] As shown above, the filter press diaphragm filter plate with a flow channel membrane shown in the present invention has the functions of filtering, squeezing, drying, etc., and is also convenient for rapid washing of filter cakes. It has a reasonable structure, convenient operation, small resistance and uniform distribution, and can simultaneously meet the functions of filtering, squeezing, drying and washing filter cakes of suspensions.

[0031] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A filter press diaphragm filter plate with a flow channel membrane, comprising a core plate (1), a pressing diaphragm (6), and a filter cloth (3), Its characteristics are: A flow channel membrane (2) is supported between the squeezing diaphragm (6) and the filter cloth (3); the flow channel membrane (2) is provided with a plurality of support protrusions (21) on the side facing the filter cloth, and small through holes (22) are provided between adjacent support protrusions (21); a main flow channel (4) connected to the main channel (5) is formed between the flow channel membrane (2) and the squeezing diaphragm (6); A squeezing chamber (7) is formed between the squeezing diaphragm (6) and the core plate (1), and the squeezing chamber (7) is connected to a high-pressure fluid inlet (11); The surface of the squeezing diaphragm (6) facing the flow channel membrane (2) is provided with a plurality of small support protrusions (8); The upper ends of the flow channel membrane (2), the squeezing diaphragm (6), the filter cloth (3) and the core plate (1) are fixed together, and the main channel (5) is connected by large through holes respectively opened in the flow channel membrane (2), the squeezing diaphragm (6), the filter cloth (3) and the core plate (1).

2. A filter press diaphragm filter plate with a flow channel membrane according to claim 1, Its characteristics are: The flow channel membrane (2) has one layer or more than one layer.

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