A metal filter element

Abstract

The utility model discloses a metal filter element, comprising a base, a perforated plate, and a metal filter cloth arranged in sequence from bottom to top, the outer edges of the metal filter cloth and the perforated plate are fixedly connected to the base, the metal filter cloth is made of a metal sheet with filter holes, the perforated plate is used to support the metal filter cloth, mesh holes are evenly distributed on the perforated plate, the size of the mesh holes is larger than the filter holes of the metal filter cloth, the base is provided with a liquid collecting cavity, and the bottom of the liquid collecting cavity is provided with a drainage hole. When in use, after the filter object is filtered by the metal filter cloth, impurities remain on the surface of the metal filter cloth, and the filtrate is discharged into the liquid collecting cavity of the base through the metal filter cloth and the perforated plate, and finally discharged through the drainage hole; after a period of use, flushing water can be passed into the drainage hole to backwash the metal filter cloth. The utility model adopts the metal filter cloth as the filter medium, and the metal filter cloth has high filtering accuracy; at the same time, the original tensile strength and flexibility of the metal are maintained, the strength is high, it is not easy to bond, and it has the characteristics of easy cleaning, easy regeneration, long life, and high pressure bearing capacity.

Description

Technical Field

[0001] The utility model relates to a metal filter element, in particular to a filter element used for a PTA dryer pressure filter, belonging to the technical field of filtering equipment. Background Art

[0002] In the prior art, PTA dryer filters usually use woven fabrics as filter media. The filter media made of such woven fabrics have the following disadvantages: (1) It is easy to get clogged for fine particles or sticky substances, which affects the filtration efficiency, so it needs to be cleaned or replaced regularly; (2) The woven fabric is easily deformed under pressure, and the uneven deformation of the pore size of the woven fabric affects the filtration effect; (3) The woven fabric itself has the disadvantages of insufficient pressure resistance and easy damage, and has a short service life.

[0003] Therefore, under the premise of meeting the filtering accuracy, developing and designing a filtering medium that is easy to clean, easy to regenerate, has a long life and high pressure bearing capacity has huge market prospects. Utility Model Content

[0004] The utility model aims to provide a metal filter element which is not easily deformed or clogged and has a long service life, so as to solve the technical problems of the prior art that the woven filter medium is easily deformed, clogged, damaged and has a short service life.

[0005] The utility model adopts the following technical scheme: a metal filter element, comprising a base, a perforated plate, and a metal filter cloth arranged in sequence from bottom to top, the outer edges of the metal filter cloth and the perforated plate are fixedly connected to the base, the metal filter cloth is made of a metal sheet with filter holes, the perforated plate is used to support the metal filter cloth, the perforated plate is evenly distributed with mesh holes, the size of the mesh holes is larger than the filter holes of the metal filter cloth, the base is provided with a liquid collecting cavity, and the bottom of the liquid collecting cavity is provided with a drainage hole.

[0006] The base is provided with a groove, and the groove is communicated with the liquid collecting chamber.

[0007] The base is a rectangular parallelepiped structure, the metal filter cloth and the perforated plate are both rectangular structures, the grooves extend along the length direction of the base, and the grooves are evenly spaced in the width direction of the base.

[0008] The liquid collecting chamber is located at the center of the base, and the liquid collecting chamber adopts a conical structure with a larger upper portion and a smaller lower portion.

[0009] The upper surface of the base is provided with a boss, the inner circumference of the boss is provided with a step surface, and the edge of the orifice plate is fixed on the step surface.

[0010] The edge of the orifice plate is welded on the step surface.

[0011] A pressing plate is provided above the edge of the metal filter cloth, and the metal filter cloth is fixed between the pressing plate and the boss of the base.

[0012] The metal filter cloth is welded between the pressing plate and the boss of the base.

[0013] The base is made of stainless steel, and the orifice plate is made of steel plate.

[0014] The thickness of the orifice plate is 1-2 mm, the thickness of the metal filter cloth is 0.01-0.1 mm, the diameter of the filter holes is greater than 0.008 mm, and the spacing between the filter holes is greater than 0.03 mm.

[0015] Beneficial effects of the utility model: The metal filter element of the utility model is installed in the filter machine when in use. After the filter object is filtered by the metal filter cloth, impurities remain on the surface of the metal filter cloth. The filtrate is discharged into the liquid collecting cavity of the base through the metal filter cloth and the orifice plate, and finally discharged through the drainage hole. After a period of use, flushing water can be passed into the drainage hole to backwash the metal filter cloth. The metal filter element of the utility model adopts metal filter cloth as the filter medium. The orifice plate is located below the metal filter plate to support the metal filter cloth to prevent the metal filter cloth from deforming. It is easy to process filter holes with high precision, uniform distribution and consistent pore size on the metal filter cloth, so the filtration precision of the metal filter cloth is high; at the same time, the original tensile strength and flexibility of the metal are maintained, the strength is high, it is not easy to bond, and it has the characteristics of easy cleaning, easy regeneration, long life and high pressure bearing capacity. Therefore, the metal filter element is not easy to be damaged or blocked, and can greatly extend the alkali washing cycle and filter cloth replacement cycle of the PTA device filter, with significant economic benefits.

[0016] Preferably, a groove is provided on the base, so that the filtrate can be discharged more smoothly. The filtrate is discharged into the groove of the base through the metal filter cloth and the perforated plate, and then flows into the liquid collecting cavity of the base from the groove.

[0017] Preferably, the liquid collecting chamber adopts a conical structure, which is conducive to rapid liquid drainage.

[0018] Preferably, the step surface on the boss of the base facilitates fixing the orifice plate.

[0019] Preferably, the pressing plate not only fixes the metal filter cloth firmly, but also prevents impurities from leaking out from the edge of the metal filter cloth.

[0020] Preferably, the perforated plate and the metal filter cloth are fixed by welding, which is convenient to manufacture and can be fixed firmly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of a metal filter element according to an embodiment of the utility model;

[0022] Figure 2 yes Figure 1AA section view;

[0023] Figure 3 yes Figure 2 BB cross-sectional view;

[0024] Figure 4 yes Figure 3 A partial enlarged view of .

[0025] In the figure: 1-base, 1.1-liquid collecting chamber, 1.2-liquid drain hole, 1.3-groove, 1.4-boss, 2-orifice plate, 3-metal filter cloth, 4-pressing plate. DETAILED DESCRIPTION

[0026] The utility model is described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figures 1 to 4 As shown, the metal filter element of this embodiment includes a base 1, a perforated plate 2, and a metal filter cloth 3 arranged in sequence from bottom to top. The outer edges of the metal filter cloth 3 and the perforated plate 2 are fixedly connected to the base 1. The metal filter cloth 3 is made of a metal sheet with filter holes. The perforated plate 2 is used to support the metal filter cloth. The perforated plate 2 is evenly distributed with mesh holes, and the size of the mesh holes is larger than the filter holes of the metal filter cloth 3. The base 1 has a liquid collecting chamber 1.1, and the bottom of the liquid collecting chamber 1.1 has a drainage hole 1.2. The liquid collecting chamber 1.1 is located at the center of the base 1, and the liquid collecting chamber 1.1 adopts a conical structure with a large top and a small bottom.

[0028] The base 1 is provided with a groove 1.3, which is connected to the liquid collecting chamber 1.1. The base 1 is a rectangular parallelepiped structure, the metal filter cloth 3 and the orifice plate 2 are both rectangular structures, the groove 1.3 extends along the length direction of the base 1, and the grooves 1.3 are evenly spaced in the width direction of the base 1.

[0029] The upper surface of the base 1 has a boss 1.4, and the inner circumference of the boss 1.4 is provided with a step surface, and the edge of the orifice plate 2 is fixed on the step surface. The edge of the orifice plate 2 is welded to the step surface by argon arc welding. A pressing plate is provided above the edge of the metal filter cloth 3, and the metal filter cloth 3 is fixed between the pressing plate 4 and the boss 1.4 of the base 1. In this embodiment, the metal filter cloth 3 is welded between the pressing plate 4 and the boss 1.4 of the base 1 by argon arc welding.

[0030] The base 1 is made of stainless steel, and the orifice plate 2 is made of steel plate. The thickness of the orifice plate 2 is 1-2 mm, the thickness of the metal filter cloth 3 is 0.01-0.1 mm, the filter hole diameter is greater than 0.008 mm, and the hole spacing of the filter holes is greater than 0.03 mm.

[0031] The metal filter cloth in the metal filter element of the utility model is manufactured according to the following steps: (1) a 316L stainless steel plate with a thickness of 10 μm is selected as a substrate; (2) the surface of the metal substrate is subjected to ultrasonic cleaning and drying treatment; (3) circular micropores with a diameter of 10 μm are designed and arranged in a matrix of 100 mm×100 mm with a hole spacing of 50 μm, for a total of 400,000 micropores; (4) a pulsed laser with a wavelength of 1.064 μm is used, the laser power is set to 1 W, and the pulse frequency is set to 100 kHz; (5) under computer control, the laser processes micropores on the metal substrate according to the designed pattern; the filter holes are processed using a femtosecond laser processing system, and the metal substrate is scanned point by point according to the hole opening requirements, and the required filter holes are processed on the metal substrate using the high energy of the femtosecond laser beam; (6) the product surface is subjected to ultrasonic cleaning, pickling passivation and drying treatment; (7) after processing, the pore size of the metal filter cloth is detected using an optical microscope to ensure that the pore size and distribution meet the design requirements.

[0032] The orifice plate is made of 1~2mm thin steel plate to support the metal filter cloth. After production, it is installed on the step surface of the base boss. The edge of the orifice plate is self-melted by argon arc welding; the filter cloth is clamped between the pressure plate and the base boss and self-melted by argon arc welding. The base, orifice plate and pressure plate are welded together to form an integral filter element, which is used in rotary drum pressure filters.

[0033] In the utility model, a metal filter cloth made of ultra-thin metal strip is used as the filter medium. Compared with woven fabrics and sintered filter elements, the metal filter cloth has a smooth surface and pores, a short pore length, is not easy to clog, and is very easy to regenerate, and is particularly suitable for filtering high-viscosity tiny particles. The metal filter cloth is processed by femtosecond laser, the filter pores are uniform in diameter, and the filter cloth has high filtering accuracy; the metal material can withstand high temperatures and is suitable for high-temperature conditions; compared with woven fabrics, it can withstand higher pressure differences and is suitable for high-pressure difference conditions; compared with sintered filter elements, the pressure loss is small and is suitable for high-quality flux conditions; and a complex and fine filter medium design can also be achieved by combining multiple layers of filter cloths with different pore sizes. The overall filter element can be installed as a module in a pneumatic drum pressure filter as a basic filter element. It can also be used as a basic filter element for other filters such as hydraulic pressure filters and candle filters.

[0034] Actual tests were conducted using metal filter cloth and woven filter cloth: the metal filter cloth was made of SS304 material, had a pore size of 0.02mm, and an opening rate of 20%; the filtration accuracy of the woven filter cloth was 0.02mm, and the filtration object was a high COD suspension with an average particle size of 0.01mm. The filter cake thickness was about 1mm, the filtration pressure difference was 0.5MPa, and the suspended matter in the filtrate was less than 50mg / L: the metal filter cloth underwent 5 filtration, backflushing, and washing cycles, and the filtration flux remained almost unchanged; the woven filter cloth underwent 2 filtration, backflushing, and washing cycles, and the filtration flux dropped to 40% of the new filter cloth. The experiment showed that the metal filter cloth had obvious advantages.

[0035] The above embodiments and descriptions are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and improvements, which are within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A metal filter element, characterized in that: It includes a base, a perforated plate, and a metal filter cloth which are arranged in sequence from bottom to top. The outer edges of the metal filter cloth and the perforated plate are fixedly connected to the base. The metal filter cloth is made of a metal sheet with filter holes. The perforated plate is used to support the metal filter cloth. The perforated plate is evenly distributed with mesh holes, and the size of the mesh holes is larger than the filter holes of the metal filter cloth. The base is provided with a liquid collecting cavity, and the bottom of the liquid collecting cavity is provided with a drainage hole.

2. The metal filter element according to claim 1, characterized in that: The base is provided with a groove, and the groove is communicated with the liquid collecting chamber.

3. The metal filter element according to claim 2, characterized in that: The base is a rectangular parallelepiped structure, the metal filter cloth and the perforated plate are both rectangular structures, the grooves extend along the length direction of the base, and the grooves are evenly spaced in the width direction of the base.

4. The metal filter element according to claim 1, characterized in that: The liquid collecting chamber is located at the center of the base, and the liquid collecting chamber adopts a conical structure with a larger upper portion and a smaller lower portion.

5. The metal filter element according to claim 1, characterized in that: The upper surface of the base is provided with a boss, the inner circumference of the boss is provided with a step surface, and the edge of the orifice plate is fixed on the step surface.

6. The metal filter element according to claim 5, characterized in that: The edge of the orifice plate is welded on the step surface.

7. The metal filter element according to claim 1, characterized in that: A pressing plate is arranged above the edge of the metal filter cloth, and the metal filter cloth is fixed between the pressing plate and the boss of the base.

8. The metal filter element according to claim 7, characterized in that: The metal filter cloth is welded between the pressing plate and the boss of the base.

9. The metal filter element according to claim 1, characterized in that: The base is made of stainless steel, and the orifice plate is made of steel plate.

10. The metal filter element according to claim 1, characterized in that: The thickness of the orifice plate is 1-2 mm, the thickness of the metal filter cloth is 0.01-0.1 mm, the diameter of the filter holes is greater than 0.008 mm, and the spacing between the filter holes is greater than 0.03 mm.

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