CN112516632A

CN112516632A - Chamber type filter plate of filter press with flow passage membrane

Info

Publication number: CN112516632A
Application number: CN202011380034.XA
Authority: CN
Inventors: 钟新钢; 虞雪芬; 阮宇科; 许俊荣
Original assignee: Zhejiang Larok Filtration Technology Co ltd
Current assignee: Zhejiang Larok Filtration Technology Co ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-03-19

Abstract

The invention provides a pressure filter chamber type filter plate with a flow channel membrane, which comprises a core plate and filter cloth positioned at two sides of the core plate, wherein the surface of the core plate is provided with a plurality of small bosses; a main channel communicated with the main channel is formed between the flow channel film and the core plate. The small through holes on the flow channel membrane have the pore size far larger than the filter holes on the filter cloth and have a certain thickness, so that the flow channel membrane can keep certain rigidity, and the main flow channel on the inner side of the flow channel membrane can be kept smooth all the time. Therefore, during filtering, the filtering channel can be kept smooth all the time, the resistance of the filtrate is small, the filtrate is uniformly distributed, and the filtering effect is greatly improved. Meanwhile, high-pressure liquid or gas can be reversely led into the main flow channel, so that the filter press has a washing and drying function, the washing and drying channel cannot be blocked, and the washing and drying effect is good.

Description

Chamber type filter plate of filter press with flow passage membrane

Technical Field

The invention relates to the technical field of filter presses, in particular to a box-type filter plate of a filter press with a runner membrane, which is adopted to enable the filter press to have the washing and drying functions.

Background

Filter-pressing separation is a common solid-liquid separation technique. In a conventional filter press, a plurality of filter plates are movably juxtaposed between a fixed end and a movable end of the filter press, and the movable end is moved by a hydraulic cylinder to press all the filter plates together, thereby forming closed filter chambers between the filter plates. Then the slurry is pumped into a filter chamber by a feed pump for solid-liquid separation. The solid-liquid separation is generally divided into the steps of filter pressing, air blowing dehydration and discharging. As disclosed in chinese patent CN108786201, the plate for a filter press, the use of the filter press, and the cleaning method of the filter press are known, a box-type filter plate is a filter plate with a feeding pipe, a filter plate main body is made of a steel plate, modified polyethylene plastic lining plates with vertical grooves are installed on both sides of the steel plate, and the grooves are used for smoothly guiding filtrate water into a drain pipe at the lower part of the filter plate and flowing out. Specially-made filter cloth is hung and installed on both sides of the box-type filter plate. In the filter pressing step, after the closed filter chambers are formed, slurry is filled into the filter chambers from the feeding port under pressure, solid components in the slurry are retained in the filter chambers by the action of the filter cloth arranged in the filter chambers, and liquid components flow out from the outlet of each filter chamber through the filter cloth. Slurry pouring is typically high pressure pouring. As the priming proceeds, the proportion of solid components in the filter chamber increases and eventually fills the entire filter chamber to form a filter cake. After the solid component filled the filter chamber to form a filter cake, the feed was stopped. Followed by air-blown dewatering. In the step of air blowing and dewatering, compressed air is blown into the filter cake to carry out air-water replacement, so that the water in the filter cake is taken away. In the discharging step, all the filter chambers are opened step by means of a hydraulic cylinder of the filter press, and the filter cake falls by means of gravity, thereby completing the discharging.

From the above, the filter cloth is an essential and important component in a filter press. However, the filter cloth is easy to deform, so that a filter pressing flow channel or a flow channel for air blowing dehydration is blocked, and the filtering or dehydration effect is greatly influenced. Taking the box-type filter plate as an example, a channel for the circulation of filtrate is formed between the small bosses on the surface of the core plate, and the filter cloth is easily embedded between the small bosses under the action of pressure, so that a filter pressing flow channel is blocked, and the filtering effect is influenced. And when the air blowing dehydration is carried out, the flow channel of the high-pressure gas is blocked, so that the air blowing dehydration effect is influenced. Therefore, the current filter press has low efficiency and poor effect because the flow channel is often blocked.

Even if the filter cloth is exchanged for another material, the filter holes in the filter cloth and the filter cloth replacement are very small, since the volume of the solid particles to be separated tends to be relatively small. The filter cloth and the filter cloth substitute have poor rigidity due to the existence of a large number of tiny filter holes, and the filter cloth substitute are easy to deform no matter what materials are adopted, thereby blocking a flow passage, and the problems still exist.

In addition, the conventional filter presses generally do not have a function of washing and drying a filter cake or a filter cloth (some filter cakes containing useful components require a plurality of washing to sufficiently recover the effective components). When a filter cake and a filter cloth need to be washed and dried, a reverse flow channel is often arranged to allow high-pressure liquid and gas to enter between the filter cloth and a diaphragm for washing or drying. From the above analysis, it can be known that the filter cloth will be embedded between the small bosses, which obviously blocks the washing and drying channel, and further affects the washing and drying effect of the filter cloth of the filter cake. Therefore, the conventional filter press does not have the washing and drying functions, and even if the washing and drying functions are available, the washing and drying effects are poor.

Finally, because the filter cloth is easily embedded between the small bosses, the water content of each part of the filter cake is uneven, the filter cake is easy to collapse, the process that the filter cake falls down by means of gravity is influenced, and the unloading can not be finished.

Disclosure of Invention

The invention aims to provide a van-type filter plate of a filter press with a flow channel membrane, wherein the flow channel membrane is supported between a core plate and filter cloth, so that a filtering flow channel and a washing and drying flow channel are always kept smooth, the functions of filtering, drying and washing are integrated, and the using effect is good.

In order to achieve the purpose, the invention provides a pressure filter chamber type filter plate with a flow channel membrane, which comprises a core plate and filter cloth, wherein the surface of the core plate is provided with a plurality of small bosses; a main channel communicated with the main channel is formed between the flow channel film and the core plate. The small through holes on the flow channel membrane have the pore size far larger than the filter holes on the filter cloth, so that the flow channel membrane can keep certain rigidity, and the main flow channel on the inner side of the flow channel membrane can be kept smooth all the time. Therefore, during filtering, the filtering channel can be kept smooth all the time, the resistance of the filtrate is small, the filtrate is uniformly distributed, and the filtering effect is greatly improved. Meanwhile, high-pressure liquid or gas can be reversely led into the main flow channel, so that the filter press has a washing and drying function, the washing and drying channel cannot be blocked, and the washing and drying effect is good.

Preferably, the flow channel film has more than two layers, and a secondary flow channel is formed between two adjacent flow channel films and is communicated with the primary flow channel. In this way, the smoothness of the main flow channel can be further maintained. Meanwhile, the multilayer runner films are combined together, so that the strength can be improved, and the service life is prolonged.

Preferably, the primary flow passage communicates with the primary flow passage through an annular passage in the upper end of the core plate. Thus, smooth communication between the main channel and the main channel can be ensured.

Preferably, the upper end of the flow passage membrane is fixed with the end of the core plate, and the main channel is formed by splicing large through holes which are respectively formed in the outer end of the flow passage membrane and the core plate. Thus, the processing and assembly can be facilitated.

As described above, the van-type filter plate with the flow channel membrane for the filter press according to the present invention has the following beneficial effects:

1) the filtering channel can be kept smooth all the time, the resistance of the filtering liquid is small, the distribution is uniform, and the filtering effect of the filter press can be ensured.

2) The filter press has the advantages that high-pressure gas or liquid is reversely led into the main flow channel, filter cakes, filter cloth and the like can be washed and dried, so that the filter press has the washing and drying functions, and the washing and drying effects are good because the main flow channel can be always kept smooth.

3) Because the filtering channel is always kept smooth, the water content in each part of the filter cake is uniform, the filter cake has compact structure, is not easy to collapse, the blanking is smooth, and the working efficiency is high.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic diagram of the use of the present invention.

Description of reference numerals:

a core board 1; an annular channel 11; a flow channel film 2; a support protrusion 21; a small through hole 22; a filter cloth 3; a main flow passage 4; a main channel 5; a filter cake 6; a pressing chamber 7; and a small boss 8.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms such as "upper", "lower", "left", "right" and "middle" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship may be made without substantial technical changes.

As shown in figures 1 and 2, the van-type filter plate with the flow channel membrane comprises a core plate 1 and filter cloth 3, wherein a plurality of small bosses 8 are arranged on the surface of the core plate 1. A flow channel membrane 2 is supported between the core plate 1 and the filter cloth 3, a plurality of supporting protrusions 21 are arranged on one side of the flow channel membrane 2 facing the filter cloth, and small through holes 22 are formed between the adjacent supporting protrusions 21. The support protrusions 21 serve to support the filter cloth 3 and also enhance the effect of pressing the filter cake. The small through holes 22 allow the filtrate collected between the struts to smoothly flow to the main channel 4. The small through hole 22 is used for passing compressed air, filtrate and flushing liquid. The other side of the flow channel membrane 2 is provided with a main flow channel 4 communicated with a main channel 5 of the filter press. The upper end of the flow channel film 2 is fixed with the upper end of the core plate 1, and the main channel 5 is formed by splicing large through holes respectively formed in the upper end of the flow channel film and the upper end of the core plate. The main flow channel 4 communicates with the main flow channel 4 through an annular channel 11 at the upper end of the core plate 1.

The flow channel film 2 may have more than two layers, and a sub-flow channel is formed between two adjacent flow channel films 2 and is communicated with the main flow channel 4. The flow path film 2 of the present embodiment may be manufactured by various methods such as pressing, injection molding, sintering, weaving, welding, and gold cutting.

The flow channel film 2 and the core plate 1 can be connected by various methods such as hot melting, fastening, welding, bonding and the like.

The core plate 1 and the runner film 2 of the invention can be made of metal, plastic, rubber and the like.

The core plate 1 of the invention can be a conventional filter plate or a non-filter core plate with only a support mechanism.

The principle of the filter plate assembly of the invention when used in a filter press is shown in fig. 2, in which the thick arrows indicate the direction of flow of the suspension and the hollow arrows indicate the direction of washing and drying. The suspension liquid enters the filter chamber through the feed inlet, filtrate penetrates through the filter cloth 3 to enter a narrow space between the runner membrane 2 and the filter cloth 3 along with the gradual increase of the feed pressure, and most of the filtrate enters a main channel 4 between the runner membrane 2 and the core plate 1 through a small through hole 22 of the runner membrane 2 and flows to a main channel 5 to be discharged because the liquid flows preferentially from a place with small resistance; a small amount of filtrate flows through a narrow space flow channel between the flow channel membrane 2 and the filter plate 1 and is collected into a liquid outlet channel to flow out (namely, the conventional liquid outlet channel of the existing filter plate). The solid particles are piled up to form a filter cake 6, and as the suspension continuously enters the filter chamber, the filter cake 6 fills the filter chamber, and the filtration is finished. Then separating the filter plates, and discharging the filter cakes 6 by the gravity of the filter plates. Then all the filter plates are combined together to carry out the next link.

To further reduce cake moisture, compressed air is introduced into the primary channel 4 through the primary channel 5, filling the entire space. At this time, the outlet of the conventional liquid outlet channel of the filter plate is closed, and with the increase of the pressure, the compressed air can only enter through the small through holes 22 on the flow channel membrane 2, reversely penetrate through the filter cloth 3 and the filter cake 6, enter the channel of the adjacent filter plate and discharge, and replace part of water in the filter cake 6. The filtrate flows to the filtration process as mentioned above. The main flow passage of the invention can be always kept smooth, so the air-blowing dehydration process has good effect and high efficiency.

And if the washing and drying are needed, high-pressure liquid or high-temperature gas is reversely introduced. Because the main flow channel can be kept smooth all the time, the whole cake filtering layer is uniformly blown, no dead angle and no short circuit exist, and obviously, the washing and drying effects are good and the efficiency is high. When the filter cake 6 is washed, the flow direction of the washing liquid is opposite to that of the filtrate in the filtering operation, and if necessary, the alternate bidirectional washing can be realized through the switching of a valve in an external pipeline. Because the flow resistance of the flushing liquid is small, the distribution is uniform, the flushing time is shorter, and the flushing liquid is obviously saved.

As shown in the above, the filter plate of the filter press with the flow channel membrane, provided by the invention, has the functions of filtering, drying and the like, and is convenient for quickly washing a filter cake. Reasonable structure, convenient operation, small resistance and even distribution, and can simultaneously meet the functions of filtering, drying and washing filter cakes of suspension.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. The utility model provides a take pressure filter van-type filter plate of runner membrane, includes core (1), filter cloth (3), and core (1) surface is equipped with a plurality of little bosss (8), characterized by: a flow channel membrane (2) is supported between the core plate (1) and the filter cloth (3), a plurality of supporting protrusions (21) are arranged on one side of the flow channel membrane (2) facing the filter cloth, and small through holes (22) are formed between every two adjacent supporting protrusions (21); and a main flow passage (4) communicated with the main channel (5) is formed between the flow passage membrane (2) and the core plate (1).

2. The van-type filter plate with the filter press of the flow channel membrane as claimed in claim 1, wherein: the runner film (2) has more than two layers, a secondary runner is formed between two adjacent runner films (2), and the secondary runner is communicated with the main runner (4).

3. The van-type filter plate with the filter press of the flow channel membrane as claimed in claim 1, wherein: the main runner (4) is communicated with the main runner (4) through an annular channel (11) at the upper end of the core plate (1).

4. The van-type filter plate with the filter press of the flow channel membrane as claimed in claim 1, wherein: the upper end part of the flow channel membrane (2) is fixed with the end part of the core plate (1), and the main channel (5) is formed by splicing large through holes which are respectively formed in the flow channel membrane (2) and the core plate (1).