WO2019128618A1

WO2019128618A1 - Plate and frame filter press with sealed variable filter chamber of elastomer

Info

Publication number: WO2019128618A1
Application number: PCT/CN2018/118487
Authority: WO
Inventors: 石文政
Original assignee: 石文政
Priority date: 2017-12-28
Filing date: 2018-11-30
Publication date: 2019-07-04
Also published as: CN108339300A; CN108339300B

Abstract

A plate and frame filter press with a sealed variable filter chamber of an elastomer, comprising a plate body (1) and frame body components (3). The plate body (1) is detachably embedded into the frame body components (3). The frame body component (3) comprises a first frame body and a second frame body matching each other. An elastic frame body matching the first and second frame bodies is provided between the first frame body and the second frame body. Inner sides of the first and second frame bodies clamp the elastic frame body. An elastic substance (4) or an elastic air bag (2) is used for the elastic frame body. Both sides of the plate body (1) and the frame bodies are enclosed into slot bodies, separately. The depth of the slot bodies is decreased as the first and second frame bodies are squeezed to the elastic frame body. Multiple filter press plates are stacked at the frame body components (3). First and second slot bodies on an opposite side of adjacent filter press plates are formed into a filter chamber. By applying pressure to the frame body components (3), the first and second frame bodies are squeezed to the elastic frame body thereof so that the depth of the first and second slot bodies is decreased so as to squeeze a filter press substance in the slot bodies. The filter press can implement an ultra-high pressure squeeze on a filter cake. A filer cake with low water content can be obtained more easily.

Description

Elastomer sealed filter chamber frame filter press

[Technical field]

The invention relates to a pressure filter device, in particular to an elastomer seal filter chamber frame filter press.

[Background technique]

The plate and frame filter press arranges the filter plates with the filtrate passages in parallel, and the filter cloth is sandwiched between the filter plates and the adjacent filter plates, and the filter plates are pressed tightly to form a filter press between the filter plates and the adjacent filter plates. room. When the equipment is working, the feed pump continuously pumps the suspension to be treated into the filter chamber, and most of the water in the suspension flows through the filter cloth attached to the filter plate, and the solid particles are intercepted by the filter cloth. A filter cake is formed in the filter chamber. Due to the limited pumping pressure of the feed pump, the water in the filter cake cannot be further reduced after all the filter chambers of the filter press are filled. In order to continue to reduce the moisture content of the filter cake, the plate and frame filter presses need to be filtered. The cake is subjected to secondary pressing. When the second press is pressed, the filter cake must be pressured again and the filter chamber volume can be reduced to squeeze out the moisture in the filter cake. Currently, the plate and frame filter press is pressed through the diaphragm or installed on the filter plate. The spring relies on the spring to compress and deform to achieve the above effect.

The diaphragm press requires a diaphragm attached to the filter plate, and a gap is left between the diaphragm and the plate body. During the secondary press, a high-pressure medium (compressed air or high-pressure water) is filled between the gap between the filter plate and the diaphragm to filter the diaphragm toward the filter chamber. The side of the cake is bulged, and the moisture in the filter cake is extruded to achieve the effect of reducing the moisture content of the cake. At present, the filter plates with diaphragms need to fuse the diaphragm and the plate body by means of hot melt. This method requires high processing precision of the filter plates and the diaphragms, and good connection during hot melt, which requires relatively high processing. Moreover, the diaphragm is easily fatigued and damaged during repeated shrinkage and contraction. Once a diaphragm plate is damaged, the whole filter plate cannot be used, and it can only be replaced with a new filter plate, which not only causes waste of resources, but also increases Equipment use and maintenance costs.

The method of secondary compression by spring compression deformation requires a spring to be mounted on the frame assembly, and the secondary cylinder presses the hydraulic cylinder on the filter press to apply a thrust to compress and deform the spring on the frame assembly. When the filter cake is pressed, the free water in the filter cake is further squeezed out to reduce the moisture content of the filter cake. Due to the extra spring on the filter plate, the complexity of the filter plate is increased, making the production of the filter plate more complicated and complicated. An important characteristic of the spring is that it is not linearly deformed during compression deformation. It is also deformed while being pressed. Due to the rigid connection between the spring and the filter plate, the spring is also driven during the twisting process. The frame assembly is distorted, which causes the spring and the filter plate to be easily damaged. If a spring on one filter plate is damaged, the spring must be replaced. However, due to the complicated structure of the filter plate and limited operation space, it is time-consuming and labor-intensive to replace the spring. Moreover, the springs can only be distributed on the filter frame at intervals. The filter frame is unevenly stressed and requires a large strength. This requires that both the filter frame and the filter plate need a metal material, so that the frame of the dehydrator is obviously coarse. The metal frame and the thick frame directly increase the overall cost.

Both of the above methods have the disadvantages of high investment and maintenance costs.

[Summary of the Invention]

The object of the present invention is to solve the problem of high moisture content after pressure filtration of a medium pressure filter of the prior art.

Another object of the present invention is to solve the problem that the compression filter of the pressure filter plate in the prior art filter press is likely to cause damage to the filter plate.

In order to achieve the above object, a pressure filter plate is provided, comprising a plate body and a frame assembly, wherein the plate body is detachably nested in the frame assembly, wherein

The frame assembly includes a first frame body and a second frame body. The first frame body and the second frame body are provided with an elastic frame body matched with the first and second frame bodies, first and second. The inner side of the frame is clamped with an elastic frame, and the elastic frame is made of an elastic body or an elastic air bag.

The first and second slots are respectively defined by the first and second slots on the two sides of the board body, and the depths of the first and second slots are pressed toward the elastic frame by the first and second frames.

The above filter press plate also has the following optimization and structure:

The outer sides of the first and second frames include outer sides for clamping the filter cloth.

The inner side of the first and second frames includes an inner surface for pressing the elastic frame, and the inner surface is sealingly fitted to the elastic frame.

The elastic body comprises rubber or polyurethane.

The elastic airbag is connected to the inflator.

The invention also includes a filter press comprising a plurality of the above-mentioned pressure filter plates, wherein the plurality of filter press plates are superposed at a frame assembly, and the first and second sides of the opposite side of the adjacent filter plate The tank forms a filter chamber.

The filter press further has the following structure:

Also included is a filter cloth that is clamped and secured by a frame assembly on an adjacent filter plate.

The pressure device for pressing the frame assembly is further included, and after the frame assembly is pressed by the pressure device, the first and second frames are pressed toward the elastic frame.

The invention also includes a pressure filtration method comprising a plurality of the above-mentioned pressure filter plates, wherein the plurality of pressure filter plates are superposed at a frame assembly, and the first and second sides of the opposite side of the adjacent filter plate The tank body forms a filter chamber, and by pressing the frame assembly, the first and second frames are pressed toward the elastic frame body, so that the depths of the first and second tank bodies are lowered to press the pressure in the tank body. Filter material.

The invention has the following advantages:

1. The filter plate has a simple structure, convenient processing and installation, and the airbag (or elastic body), the plate body and the frame assembly can be produced by batch molding.

2. The airbag (or elastic body) is telescopic in the straight line direction, and does not cause distortion. The filter frame is only subjected to externally applied force, the force is continuous and uniform, and no destructive force is generated between the connected components. Will not break.

3. The airbag (or elastic body) and the filter plate are simply matched. If an airbag (or elastic body) is damaged, only the airbag (or elastic body) needs to be replaced. The filter plate and the outer frame need not be replaced, and the filter plate is improved. Service life reduces maintenance costs

4. When the secondary press is squeezed by the oil cylinder, the oil cylinder can output a large force, and the ultra-high pressure extrusion can be realized on the filter cake, and the filter cake with low water content is more easily obtained, thereby reducing the running cost. The secondary pressing force can be increased to 60 kg/cm 2 or even higher.

[Description of the Drawings]

Figure 1 is a front view of the filter plate;

Figure 2 is a schematic view of the filter cake before the second press;

Figure 3 is a schematic view of the press cake after secondary pressing;

Figure 4 is a schematic view of the filter cake before the second press;

Figure 5 is a schematic view of the press cake after secondary pressing;

Figure 6 is a cross-sectional view of the filter plate;

Figure 1. Plate body 2. Elastic air bag 3. Frame assembly assembly 4. Elastic body.

[Detailed ways]

The invention is further described in the following with reference to the embodiments and the accompanying drawings, which are intended to be illustrative only and not to limit the scope of the invention.

As shown in FIG. 1 and FIG. 6 , the pressure filter plate of the embodiment includes a plate body and a frame assembly. The plate body is detachably nested in the frame assembly, and the frame assembly includes the first frame matched. And the second frame body, the first frame body and the second frame body are provided with an elastic frame body matched with the first frame and the second frame body, and the inner side of the first and second frame bodies are respectively clamped with the elastic frame body. The elastic frame body adopts an elastic body or an elastic airbag, and the elastic body includes rubber or polyurethane. The elastic bladder is connected to the inflator. Wherein, the outer sides of the first and second frames include an outer side surface for clamping the filter cloth. The inner side of the first and second frames includes an inner surface for pressing the elastic frame, and the inner surface is sealed with the elastic frame, and the two sides of the plate are respectively enclosed with the first and second frames. The first and second tank bodies have a depth of the first and second tank bodies which are pressed toward the elastic frame body by the first and second tank bodies.

The structure of the filter plate can be either existing or designed according to requirements. For example, in the utility model, the inlet port of the filter plate is disposed in the middle, and the corresponding position of the filter cloth and the filter plate is provided with a corresponding opening. The filter cloths on both sides of the filter plate are connected together at the opening to prevent the filter residue in the filtrate from entering the gap between the filter cloth and the filter plate, and the filtrate can be opened through the filter plate, and the opening is open to the plate body. The edge is connected to the outlet pipe to collect or discharge it.

The above filter press plate can be applied to a corresponding filter press, including a plurality of the above-mentioned filter press plates, and the plurality of filter press plates are superposed at a frame assembly, and the superimposed manner is in a conventional filter press. The filter plate is similar in manner, and in the present invention, the filter plate forms contact and superposition at the frame assembly, and the first and second grooves on the opposite side of the adjacent filter plate form a filter chamber, which is the present invention. Different from the prior art, the prior art filter chamber generally needs to add a separate filter frame formation. The prior art center generally has a filter plate-filter frame-filter plate arrangement, and a filter chamber is formed in the filter frame. The two sides of the filter chamber form a relatively closed space through the filter plate, and the present invention can no longer separately provide a filter frame, and the filter chamber is not directly pressed by pressure, but by the elasticity of the squeeze filter frame. The frame makes the thickness of the filter frame thinner, thereby reducing the space of the filter chamber and achieving secondary pressure filtration. The filter cloth is clamped and fixed by the frame assembly on the adjacent filter plate. The pressure device for pressing the frame assembly is further included, and after the frame assembly is pressed by the pressure device, the first and second frames are pressed toward the elastic frame. By pressing the frame assembly, the first and second frames are pressed toward the elastic frame, and the depths of the first and second grooves are lowered to squeeze the filter press material located in the groove.

Airbag type working principle:

Referring to Fig. 1, the main feature of the present embodiment is that the filter plate is composed of a plate body 1, an elastic air bag 2, and a frame assembly 3. The two frame assemblies 3 are sleeved on both sides of the plate body 1 with an elastic air bag 2 interposed therebetween. After the airbag 2 is inflated, it will bulge to the sides, and the frame assembly 3 and the elastic airbag 2 are fitted together, and the elastic airbag 2 is bulged while the frame assembly 3 is moved to both sides.

During operation, the pressing end of the filter press is driven to a predetermined position by the hydraulic cylinder, and the elastic airbag 2 is filled with high-pressure air, and the frame assembly 3 is pushed to the predetermined position of the plate body 1, and the adjacent frame assembly 3 is The surrounding of the filter cloth attached to the filter plate is pressed tightly. At this time, the force of pressing the filter cloth is completely applied by the elastic air bag 2. We can flexibly adjust the intake pressure of the air bag according to the maximum feed pressure of the feed pump to ensure In the feed press stage, the filter residue is completely sealed in the filter chamber and is not sprayed. The frame assembly 3 on both sides of the inflatable bag 2 is moved outward relative to the plate body 1 at this time, and the space of the filter press chamber composed of two adjacent filter plates is also maximized. After the filter plate is in place, the feed pump is started, and the suspended liquid to be treated is continuously pumped into the filter chamber, and the filtrate is discharged through the drain port on the plate body 1, and the filter residue is intercepted in the filter chamber to form a filter cake, as shown in FIG.

After the filter chamber is filled, it is necessary to carry out secondary pressing to further reduce the moisture content of the filter cake. At this time, the hydraulic cylinder continues to push the compression side of the filter press forward, and the plate body 1 and the frame assembly 3 are under pressure, and the elastic airbag is pressed. 2 deformation and contraction under the compression of the frame assembly 3, the space of the frame assembly 3 on both sides of the same filter plate is reduced after the elastic airbag 2 is contracted, and at the same time, the distance between the adjacent two plates 1 is also When the volume of the filter chamber is reduced, the filter cake in the filter chamber is squeezed out by the plate body 1 to precipitate free water, and the water content is further reduced, as shown in FIG.

At present, plate-and-frame (box) filtration has become the main equipment in the solid-liquid separation industry. It is widely used in sewage treatment, tap water, food, coal, petrochemical, steel, electric power, pharmaceutical and other important areas of the national economy, but the deep application of the product is affected. The influence of the maximum squeezing force, the extrusion method such as diaphragm extrusion, is difficult to further increase when the pressure is increased to 16 kg/cm 2 . The spring extrusion method has high input and use costs. These have been plagued by the application of panel (box) filtration products. This patent effectively solves the above problems and can make the deep use of the product usher in the vast market and benefit the society.

Flexible entity works:

As shown in FIG. 4, during operation, the pressing end of the filter press walks to a predetermined position under the pushing of the hydraulic cylinder, and the elastic body 4 sandwiched between the frame assemblies 3 is compressed to deform, and the deformed elastic body 4 The yield force in turn presses the frame assembly 3, and the adjacent frame assembly 3 presses the filter cloth around. We can adjust the compression amount of the elastic body 4 according to the maximum feed pressure of the feed pump to ensure the feed. The filter residue in the press stage is completely sealed in the filter chamber and is not sprayed.

After the filter plate chamber is filled with filter residue, the moisture content of the filter residue is still relatively high. If it is necessary to further reduce the moisture content of the filter residue, the volume of the filter plate chamber should be further reduced. At this time, the hydraulic cylinder of the filter press continues to advance. The elastic body 4 between the body components 3 continues to be compressed, the volume of the filter chamber is further reduced, and the moisture content of the filter residue is further reduced, as shown in FIG.

6. On the surface of the plate body, the metal electrode can be added according to the use of the frame frame machine and the dehydration process. The mechanical dewatering combined with the electric dehydration can further reduce the moisture content of the filter residue. The municipal sludge dewatering can be contaminated by mechanical pressing and electric dehydration. The moisture content of the mud is reduced to 40%. This design can be combined with the electrodialysis invention patent (patent number: ZL 2014 1 0334592.0) that we have obtained.

Claims

A filter plate comprising a plate body and a frame assembly, wherein the plate body is detachably nested in the frame assembly, wherein

The frame assembly includes a first frame body and a second frame body. The first frame body and the second frame body are provided with an elastic frame body matched with the first and second frame bodies, first and second. The inner side of the frame is clamped with an elastic frame, and the elastic frame is made of an elastic body or an elastic air bag.

The first and second slots are respectively defined by the first and second slots on the two sides of the board body, and the depths of the first and second slots are pressed toward the elastic frame by the first and second frames.
The filter press plate of claim 1 wherein the outer sides of the first and second frames include outer sides for gripping the filter cloth.
A filter press according to claim 1, wherein the inner side of the first and second frames includes an inner surface for pressing the elastic frame, and the inner surface is sealingly fitted to the elastic frame.
The filter press panel of claim 1 wherein said elastomeric body comprises rubber or polyurethane.
A filter press according to claim 1, wherein said elastic bladder is coupled to the inflator.
A filter press characterized by comprising a plurality of filter press plates according to any one of claims 1 to 5, wherein the plurality of filter press plates are superposed at a frame assembly, and the adjacent filter plates are opposite one The first and second tanks on the side form a filter chamber.
The filter press of claim 6 further comprising a filter cloth clamped and secured by the frame assembly on the adjacent filter plate.
A filter press according to claim 6, further comprising pressure means for squeezing the frame assembly, wherein the frame assembly is pressed by the pressure means, and the first and second frames are pressed toward the elastic frame. Pressure.
A pressure filtration method comprising a plurality of filter press plates according to any one of claims 1 to 5, wherein the plurality of filter press plates are superposed at a frame assembly, and the adjacent filter plates are opposite one The first and second tanks on the side form a filter chamber, and by pressing the frame assembly, the first and second frames are pressed toward the elastic frame, so that the depths of the first and second grooves are lowered. Squeeze the filter press material located in the tank.