A powder graded dry pressing filter

Abstract

The present invention belongs to the technical field of powder squeeze-dry filtration, and discloses a graded squeeze-dry filter for powders, comprising a squeeze dryer, and also comprising a filter press module 1, which is movably arranged in the inner cavity of the squeeze dryer and whose outer periphery is interference-fitted with the inner wall of the squeeze dryer; a filter press module 2, which is movably arranged in the squeeze dryer and whose outer periphery is interference-fitted with the inner wall of the squeeze dryer; a filtrate mechanism, which is arranged in the squeeze dryer and is located below the filter press module 2; wherein, an extrusion filtration chamber for a solid-liquid mixture is formed between the filter press module 1 and the filter press module 2, the filtrate mechanism comprises a plurality of evenly distributed filter cartridges connected to the external environment, and the filter press module 2 is provided with a through hole which is slidably sleeved with the filter cartridge; the present invention arranges an elastic film and a piston block, so that it is easier to squeeze the filter cake again within a small area, and further discharge the water therein to the outside, thereby improving the dryness compared with a traditional microporous plate filter press.

Description

Technical Field

[0001] The invention belongs to the technical field of powder squeeze-dry filtering, in particular to a graded squeeze-dry filtering machine for powders. Background Art

[0002] Washing and drying of powder materials is an important part of the production of industrial materials. The powder dryers currently used are divided into several categories, mainly filter cloth membrane drying. Although this drying method can obtain higher powder dryness and lower energy consumption, it is time-consuming. In addition, the filter cloth has a limited interception effect on powders, so a large amount of powder leakage will occur, which will cause filtration loss of powder materials. Another method uses a microporous plate filter press, which has less powder loss, but its dryness is relatively low and difficult to improve.

[0003] In summary, the present application proposes a graded dry pressing filter for powders, which is used to overcome the above-mentioned defects by multi-stage pressing without transferring the powders. Summary of the invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a powder graded dry pressing filter.

[0005] To achieve the above object, the present invention provides the following technical solution: a powder graded squeeze filter, comprising a squeeze filter, and a filter press module 1, which is movably arranged in the inner cavity of the squeeze filter and has an outer periphery that is interference-fitted with the inner wall of the squeeze filter;

[0006] The filter press module 2 is movably arranged in the dryer and its outer periphery is interference fit with the inner wall of the dryer;

[0007] A filtrate mechanism, which is arranged in the squeeze dryer and located below the filter press module 2;

[0008] Among them, the filter press module 1 and the filter press module 2 form an extrusion filtration chamber for the solid-liquid mixture, the filtrate mechanism includes a number of evenly distributed filter cartridges connected to the external environment, and the filter press module 2 is provided with a through hole that is slidably sleeved with the filter cartridge;

[0009] The squeeze dryer also includes oil cylinder 1 and oil cylinder 2 respectively arranged at the top and bottom parts for driving filter press module 1 and filter press module 2. The outside of the squeeze dryer is provided with a liquid inlet for supplying a solid-liquid mixture to the squeeze dryer.

[0010] Preferably, the filter press module 1 comprises a sub-rigid microporous filter material, a fiber layer arranged on the sub-rigid microporous filter material, a wire mesh layer and a metal filter plate sequentially covered on the fiber layer.

[0011] Preferably, the fiber layer is composed of a plurality of rows of fiber bundles connected end to end, the fiber bundle layer has a thickness of 1-2 mm, the width of each row of limiting bundles is 22-25 mm, and the diameter of each fiber bundle is 0.1-0.15 mm;

[0012] The diameter of each of the fiber bundles is not completely consistent.

[0013] Preferably, the mesh number of the screen of the wire mesh layer is 200-400 meshes, and the wire mesh layer is formed by stacking 3-4 layers of screens, the mesh number of each layer of screens is not completely consistent, and the mesh number of the stacked screens increases from the outside to the inside;

[0014] The diameter of the fiber filaments of the filter is 0.1-0.15mm, and there is a 0.3mm coarse convex point at the intersection of the warp and weft of the filter.

[0015] Preferably, a drainage hose is provided on the filter press module 1, and the bottom end portion of the drainage hose is loosely coiled on the top of the filter press module 1. The dryer also includes an air inlet 1 for intake of air into the upper cavity of the filter press module 1.

[0016] Preferably, the dryer also includes a top sealing plate fixedly mounted on the top and a support plate sealed at the bottom, the filter press module 2 and the filtrate mechanism are arranged on the support plate and rise and fall together with the support plate, and an air inlet 2 is arranged at the bottom of the dryer for intake of air into the cavity of the dryer located under the filter press module 2.

[0017] Preferably, the filter press module 2 includes a pressure plate, and a plurality of evenly distributed through grooves are opened on the filter press module 2, the top of the through groove is covered with an elastic film, a piston block is interference fit in the through groove, the piston block is supported on the bottom of the elastic film, and a limit ring supported on the bottom of the piston block is also fixed in the through groove.

[0018] Preferably, a protective cover is installed at the bottom of the through slot, and a small hole is opened at the bottom of the protective cover for air intake.

[0019] Preferably, the filtrate mechanism discharges the water to the external environment through a liquid outlet valve arranged on the support plate.

[0020] Preferably, the filter material structure and arrangement on the periphery of the filter cartridge are consistent with the filter press module.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention performs primary filtration by driving the filter press module 1 downward, and the liquid-solid mixture is discharged into the external environment through the filter cartridge and the filter press module 1 under pressure. The presence of multiple filter cartridges improves the efficiency of the primary filtration and speeds up the drainage. After the primary filtration drainage stage is completed, the filter press module 2 is driven to rise upward, and the filter press module 2 is lifted to be flush with the top of the filter cartridge at most, and cooperates with the filter press module 1 to filter the filter cake therebetween for secondary and tertiary filtration. During the tertiary filtration process, by providing an elastic film and a piston block, it is easier to squeeze the filter cake again within a small area, and further discharge the water therein to the outside, thereby improving the dryness compared to the traditional microporous plate filter press.

[0023] The present invention filters the powder by setting the fiber layer and the wire mesh layer, has a high interception rate for hydrophilic and viscous powders, and improves the interception efficiency for ultrafine powders. Through the pretreatment of the fiber layer and the wire mesh layer, the interception pressure of the main filter material for ultrafine powders is reduced, the filter pressing speed is increased, and the loss of powder materials is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 A top view of the filter press module 1 of the present invention;

[0026] Figure 3 This is a schematic diagram of the structural disassembly of the filter press module 1 of the present invention;

[0027] Figure 4 It is a cross-sectional schematic diagram of the filter press module 2 of the present invention;

[0028] Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure of part A;

[0029] Figure 6 It is a schematic diagram of the top structure of the filter press module three of the present invention.

[0030] In the figure: 100, dryer; 101, top sealing plate; 102, support plate; 103, oil cylinder one; 104, oil cylinder two; 105, liquid inlet; 106, air inlet one; 107, air inlet two; 108, liquid outlet valve; 200, filter press module one; 201, sub-rigid microporous filter material; 202, fiber layer; 203, wire mesh layer; 204, metal filter plate; 300, filter press module two; 301, pressure plate; 302, through groove; 303, elastic film; 304, piston block; 305, limit ring; 306, protective cover; 400, filtrate mechanism; 401, filter cartridge; 500, drain hose; 600, oil cylinder three. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] like Figures 1 to 6 As shown, the present invention provides a powder graded squeeze filter, including a squeeze dryer 100, and also includes a filter press module 200, which is movably arranged in the inner cavity of the squeeze dryer 100 and its outer periphery is interference-fitted with the inner wall of the squeeze dryer 100;

[0033] The second filter press module 300 is movably disposed in the dryer 100 and its outer periphery is interference-fitted with the inner wall of the dryer 100;

[0034] The filtrate mechanism 400 is disposed in the dryer 100 and is located below the filter press module 2 300;

[0035] Among them, the filter press module 1 200 and the filter press module 2 300 form an extrusion filtration chamber for the solid-liquid mixture, the filtrate mechanism 400 includes a number of evenly distributed filter cartridges 401 connected to the external environment, and the filter press module 2 300 is provided with a through hole that is slidably sleeved with the filter cartridge 401;

[0036] The dryer 100 further includes an oil cylinder 103 and an oil cylinder 104 respectively disposed at the top and bottom for driving the filter press module 1 200 and the filter press module 2 300 . A liquid inlet 105 for supplying a solid-liquid mixture to the dryer 100 is disposed outside the dryer 100 .

[0037] Through the above scheme, the liquid-solid mixture or the washing liquid enters the inner cavity of the squeeze dryer 100 at the liquid inlet 105, and the filter press module 1 200 is initially located above the liquid inlet 105. After the liquid-solid mixture is injected, it is located between the filter press module 1 200 and the filter press module 2 300, and in the initial state, the filter cartridge 401 is exposed upward above the filter press module 2 300, and the filter cartridge 401 is completely immersed in the liquid-solid mixture. The filter press module 1 200 is driven downward to perform a first-stage filter press, and the liquid-solid mixture is discharged to the external environment through the filter cartridge 401 and the filter press module 1 200 under pressure. The presence of multiple filter cartridges 401 significantly improves the efficiency of the first-stage filter press and speeds up the liquid discharge. After the first stage of filter pressing and drainage is completed, the filter pressing module 2 300 is driven to rise upward, and the filter pressing module 2 300 is lifted to the top of the filter cartridge 401 at most, and cooperates with the filter pressing module 1 200 to filter the filter cake between them for the second and third stage of filter pressing. The water passes through the filter pressing module 1 200 and reaches the top of it and is discharged to the external environment.

[0038] like Figure 3 As shown, the filter press module 1 200 includes a sub-rigid microporous filter material 201, a fiber layer 202 disposed on the sub-rigid microporous filter material 201, a wire mesh layer 203 and a metal filter plate 204 sequentially covering the fiber layer 202.

[0039] The sub-rigid microporous filter material 201 is the main filter material layer for filtration, while the fiber layer 202 and the wire mesh layer 203 play a corresponding auxiliary role, which is used to intercept and retain the powder on the surface of the filter press module 200. Through the auxiliary interception of the fiber layer 202 and the wire mesh layer 203, the filtration pressure of the sub-rigid microporous filter material 201 and the difficulty of backwashing and cleaning in the later stage can be reduced, and the long-term and efficient filtration capacity of the overall filter material can be effectively improved. The main function of the metal filter plate 204 is to improve the overall structural strength of the filter press module 200 and prevent it from deformation and displacement during the filter press process.

[0040] like Figure 3 As shown, the fiber layer 202 is composed of a plurality of rows of fiber bundles connected end to end, the fiber bundle layer has a thickness of 1-2 mm, the width of each row of limiting bundles is 22-25 mm, and the diameter of each fiber bundle is 0.1-0.15 mm;

[0041] The diameter of each fiber strand is not exactly the same.

[0042] The fiber filaments are arranged in parallel without crossing, and the head and tail ends of each column of fiber bundles are naturally interlaced and connected. Each column of fiber bundles is fixed on the sub-rigid microporous filter material 201 only at the head end, and there is no restriction on the tail end. Its arrangement is finally compressed by the wire mesh layer 203 and the metal filter plate 204. The main function of the fiber layer 202 is to intercept a large amount of ultra-fine powder, while the sub-rigid microporous filter material 201 only needs to intercept a small part in the end, reducing the filtering pressure of the sub-rigid microporous filter material 201. In this way, the ultra-fine powder can be intercepted and stacked outside the fiber layer 202 and even the metal filter plate 204 to form a filter cake layer.

[0043] like Figure 2-3 As shown, the mesh number of the screen layer 203 is 200-400 meshes, and the screen layer 203 is composed of 3-4 layers of screens stacked together. The mesh number of each layer of screens is not completely consistent, and the mesh number of the stacked screens increases from the outside to the inside.

[0044] The fiber diameter of the filter is 0.1-0.15mm, and there is a 0.3mm coarse convex point at the intersection of the warp and weft of the filter.

[0045] The mesh layer mainly plays a pre-filtering role for the sub-rigid microporous filter material 201 and the fiber layer 202, and acts as a resistance to the viscous filter cake layer and the floc filter cake layer. The coarse convex points arranged at the intersection of the warp and the weft are used to play a certain filtering role.

[0046] like Figure 1 and 4 As shown, a drainage hose 500 is provided on the filter press module 200, and the bottom end portion of the drainage hose 500 is loosely coiled on the top of the filter press module 200. The dryer 100 also includes an air inlet 106 for intake of air into the upper cavity of the filter press module 200.

[0047] The bottom end of the drain hose 500 is relatively long, and its plate is placed on the filter press module 200, so that the inlet at the bottom end can always be flush with the top plane of the filter press module 200, and air is injected from the air inlet 106 into the cavity above the filter press module 200 to increase the pressure therein, and the water filtered downward by the filter press module 200 is discharged outward through the drain hose 500 to discharge the filtered water or other washing liquid therein. The air inlet 106 may be used to maintain the pressure balance in the cavity above the filter press module 200.

[0048] like Figure 1 As shown, the dryer 100 also includes a top sealing plate 101 fixedly mounted on the top and a support plate 102 sealed at the bottom through a cylinder 3 600, the filter press module 2 300 and the filtrate mechanism 400 are arranged on the support plate 102 and rise and fall together with it, and an air inlet 2 107 is arranged at the bottom of the dryer 100 for intake of air into the cavity of the dryer 100 located below the filter press module 2 300.

[0049] The oil cylinder 3 600 controls the support plate 102 to open for removing the filter cake powder, and provides appropriate pressure for sealing between the support plate 102 and the dryer 100.

[0050] like Figure 4 and Figure 5 As shown, the filter press module 2 300 includes a pressure plate 301, and a plurality of evenly distributed through grooves 302 are opened on the filter press module 2 300. The top of the through groove 302 is covered with an elastic film 303. A piston block 304 is interference fit in the through groove 302. The piston block 304 is supported on the bottom of the elastic film 303. A limiting ring 305 supported on the bottom of the piston block 304 is also fixedly installed in the through groove 302.

[0051] The filter press module 2 300 is a related component in the third-stage filter press stage. The elastic film 303 mainly plays a role of sealing and isolation, isolating the upper and lower environments of the filter press module 2 300 to prevent leakage. The piston block 304 supports the elastic film 303 to prevent the filter press failure caused by the large pressure caused by the filter cake and the cavity at the bottom. The limit ring 305 is used to limit the height of the piston block 304, and also plays a supporting role in the second-stage filter press process.

[0052] In the three-stage filter pressing stage, air is injected into the cavity under the filter pressing module 2 300 through the air inlet 2 107 to maintain the high pressure state of the internal environment therein, and the pressure is not less than 0.7MPa. A monitoring pressure gauge is provided on the support plate 102. The piston block 304 is pushed by the pressure to cause the elastic film 303 to bulge upward and deform slightly, further compressing the space between the filter pressing module 1 200 and the filter pressing module 2 300, and finally filtering the water in the filter cake outward again. The three-stage filter pressing stage is set up on a wide plane. Due to the strength of the filter material and the upper limit of the applied pressure range, the pressure of the filter pressing module 1 200 and the filter pressing module 2 300 on the filter cake and the obtained water content ratio of the filter pressing are relatively low. Therefore, the small plane formed by multiple elastic films 303 and the piston block 304 is pressed again, and the filter cake can be further compressed on a smaller plane to discharge the residual water therein.

[0053] There is no unique distribution form for the arrangement of the elastic film 303, and those skilled in the art can formulate and configure it according to actual working conditions.

[0054] like Figure 4 and 5 As shown, a protective cover 306 is installed at the bottom of the through slot 302, and a small hole is opened at the bottom of the protective cover 306 for air intake.

[0055] The protective cover 306 serves to limit the height of the pressure plate 301 during the lifting process, and a through hole is provided at the bottom thereof for connecting the environment between the through groove 302 and the bottom cavity of the filter press module 2 300 .

[0056] like Figure 1 As shown, the filtrate mechanism 400 discharges water to the external environment through the liquid outlet valve 108 disposed on the support plate 102 .

[0057] The liquid outlet valve 108 is used to control the conduction between the filtrate mechanism 400 and the external environment. In the first stage of filter pressing, the liquid outlet valve 108 is in an open state, and is used to discharge the water filtered by the filter cartridge 401. The water filtered by the filter cartridge 401 reaches its interior and vertically collects in the unified water collection tank of the filtrate mechanism 400, and is discharged to the external environment through the liquid outlet valve 108 in the water collection tank. In the second and third stages of filter pressing, it is no longer necessary to discharge water to the outside through the liquid outlet valve 108. In particular, in the third stage of filter pressing, the liquid outlet valve 108 needs to be closed, so that the high-pressure gas entering through the second air inlet 107 will not leak out through the filtrate mechanism 400, thereby maintaining the high-pressure environment in the dryer 100 below the filter press module 2 300, so that the third stage of filter pressing can work in a high-pressure environment.

[0058] like Figure 1 As shown, the filter material structure and arrangement of the outer periphery of the filter cartridge 401 are consistent with those of the filter press module 200.

[0059] The distribution of filter materials on the filter cartridge 401 is basically the same as that of the filter press module 200, and both are composed of a main filter material layer, a fiber bundle layer and a mesh cloth layer, ensuring that the downward filtering effect remains basically the same, and trying to minimize the difference in upper and lower dehydration effects during the filtration process while increasing the first-level filtration speed.

[0060] Since the periphery of the filter cartridge 401 does not participate in the secondary filter pressing process, the metal filter plate 204 may not be provided on the periphery of the filter cartridge 401, but the top of the filter cartridge 401 needs to be rigid.

[0061] The working principle and use process of the present invention:

[0062] The liquid-solid mixture or the washing liquid enters the inner cavity of the squeeze dryer 100 at the liquid inlet 105, and the filter press module 1 200 is initially located above the liquid inlet 105. After the liquid-solid mixture is injected, it is located between the filter press module 1 200 and the filter press module 2 300, and in the initial state, the filter cartridge 401 is exposed upward above the filter press module 2 300, and the filter cartridge 401 is completely immersed in the liquid-solid mixture. The filter press module 1 200 is driven downward to perform a first-stage filter press, and the liquid-solid mixture is discharged to the external environment through the filter cartridge 401 and the filter press module 1 200 under pressure. The presence of multiple filter cartridges 401 significantly improves the efficiency of the first-stage filter press and speeds up the liquid discharge. After the first-stage filter pressing and drainage stage is completed, the filter pressing module 2 300 is driven to be lifted upward, and the filter pressing module 2 300 is lifted to be flush with the top of the filter cartridge 401 at most, and cooperates with the filter pressing module 1 200 to filter the filter cake between them for the second and third stage filter pressing;

[0063] In the third stage of filter pressing, air is injected into the cavity under the second filter pressing module 300 through the second air inlet 107 to maintain the high pressure state of the internal environment. The piston block 304 is pushed by the pressure to push the elastic film 303 upward to deform slightly, further compressing the space between the first filter pressing module 200 and the second filter pressing module 300, and the water in the filter cake is pressed out again for the final filtration.

[0064] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0065] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A powder grading squeeze filter, comprising a squeeze dryer (100), characterized in that: It also includes a filter press module 1 (200), which is movably arranged in the inner cavity of the dryer (100) and whose outer periphery is interference-fitted with the inner wall of the dryer (100); A second filter press module (300) is movably disposed in the dryer (100) and its outer periphery is interference-fitted with the inner wall of the dryer (100); A filtrate mechanism (400) is disposed in the dryer (100) and is located below the second filter press module (300); The filter press module 1 (200) and the filter press module 2 (300) form an extrusion filtration chamber for a solid-liquid mixture, the filtrate mechanism (400) comprises a plurality of evenly distributed filter cartridges (401) connected to an external environment, and the filter press module 2 (300) is provided with a through hole that is slidably sleeved with the filter cartridge (401); The squeeze dryer (100) further comprises a first oil cylinder (103) and a second oil cylinder (104) respectively arranged at the top and bottom for driving the first filter press module (200) and the second filter press module (300); the outside of the squeeze dryer (100) is provided with a liquid inlet (105) for supplying a solid-liquid mixture into the squeeze dryer (100); The filter press module 2 (300) comprises a pressing plate (301), the filter press module 2 (300) is provided with a plurality of evenly distributed through grooves (302), the top of the through groove (302) is covered with an elastic film (303), a piston block (304) is interference-fitted in the through groove (302), the piston block (304) is supported on the bottom of the elastic film (303), and a limiting ring (305) supported on the bottom of the piston block (304) is also fixedly installed in the through groove (302); A protective cover (306) is installed at the bottom of the through slot (302), and a small hole is opened at the bottom of the protective cover (306) for air intake.

2. The powder graded dry-pressing filter according to claim 1, characterized in that: The filter press module 1 (200) comprises a sub-rigid microporous filter material (201), a fiber layer (202) arranged on the sub-rigid microporous filter material (201), a wire mesh layer (203) and a metal filter plate (204) sequentially covering the fiber layer (202).

3. The powder graded dry-squeeze filter according to claim 2, characterized in that: The fiber layer (202) is composed of a plurality of rows of fiber bundle layers connected end to end, the fiber bundle layer has a thickness of 1-2 mm, the width of each row of limiting bundle layers is 22-25 mm, and the diameter of each fiber bundle is 0.1-0.15 mm; The diameter of each of the fiber bundles is not completely consistent.

4. The powder graded dry-squeeze filter according to claim 3, characterized in that: The mesh number of the filter screen of the wire mesh layer (203) is 200-400 meshes. The wire mesh layer (203) is formed by stacking 3-4 layers of filter screens. The mesh number of each layer of filter screens is not completely consistent, and the mesh number of the stacked filter screens increases from the outside to the inside. The diameter of the fiber filaments of the filter is 0.1-0.15mm, and there is a 0.3mm coarse convex point at the intersection of the warp and weft of the filter.

5. The powder graded dry-squeeze filter according to claim 4, characterized in that: The filter press module 1 (200) is provided with a drainage hose (500), and the bottom end portion of the drainage hose (500) is loosely coiled on the top of the filter press module 1 (200). The dryer (100) also includes an air inlet 1 (106) for intake of air into the upper cavity of the filter press module 1 (200).

6. A powder graded dry-squeeze filter according to any one of claims 1 to 5, characterized in that: The dryer (100) further comprises a top sealing plate (101) fixedly mounted on the top and a support plate (102) sealedly fitted to the bottom via a third oil cylinder (600); the second filter press module (300) and the filtrate mechanism (400) are arranged on the support plate (102) and rise and fall together with the support plate; and a second air inlet (107) is arranged at the bottom of the dryer (100) for intake of air into the cavity of the dryer (100) located below the second filter press module (300).

7. The powder graded dry-squeeze filter according to claim 6, characterized in that: The liquid filtering mechanism (400) discharges water to the external environment through a liquid outlet valve (108) arranged on the supporting plate (102).

8. The powder graded dry-pressing filter according to claim 6, characterized in that: The filter material structure and arrangement of the outer periphery of the filter cartridge (401) are consistent with those of the filter press module 1 (200).

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