A multi-layer microfilter filter assembly

Abstract

The present invention discloses a multi-layer microfilter filter screen assembly, which belongs to the technical field of water treatment equipment. The present invention comprises a metal frame arranged on a filter cartridge, a filter screen is laid under the metal frame, connecting through holes are arranged on the four sides of the metal frame, the connecting through holes cooperate with bolts arranged on a pressure plate, the metal frame comprises an outer frame, a plurality of inner circle mesh holes distributed in a chessboard shape are arranged on the outer frame, each inner circle mesh hole is connected to the outer frame through connecting plates arranged vertically and horizontally, and outer circle mesh holes are arranged around the four sides of the inner circle mesh holes. The filter screen assembly of the present invention has high strength, reliable structure, large processing flux, stable effluent water quality, and stable equipment operation. By designing the edge of the outer circle mesh hole of the metal frame as a continuous gradient curve edge, the force support area of ​​the metal frame is increased, the force is gradually decomposed, linear stress concentration is avoided, the probability of cutting fracture is reduced, the structural strength is improved, and the service life of the filter screen is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of water treatment equipment, and in particular relates to a microfilter screen component with a multi-layer structure. Background Art

[0002] Microfilters, or precision filters, filter suspended matter, particles and other impurities in sewage through the filter on the filter cartridge to purify the water quality. At the same time, they flush out the impurities attached to the filter through the top backwash method to restore the filter flux. The filter is subject to the alternating shear force of the sewage's own weight and the backwash force, and is easily damaged. Therefore, the structural strength and durability of the filter is one of the important guarantees for maintaining the continuous and normal operation of the microfilter.

[0003] Usually, the filter assembly used in the microfiltration machine in the water treatment field is composed of a metal filter cloth and a metal frame. Metal mesh plates are added on both sides of the metal filter cloth as a frame to improve the structural strength of the filter. In the prior art, the edge of the outer mesh of the metal frame is often designed as a straight edge to facilitate manufacturing. However, the design of the straight edge is prone to linear stress concentration, which causes the metal frame to break at this point and reduces its service life.

[0004] In addition, in the prior art, the filter cloth bears the weight of the sewage when it flows through, and bears the reverse force of flushing at the top of the microfiltration machine. Under repeated shearing, the filter cloth is easy to break. Therefore, the structural strength of the filter assembly is low and the impact resistance is low. If a microfiltration machine using such a filter assembly is used, it is necessary to maintain a low water inlet level to maintain the life of the filter, resulting in low processing flux and low filtration efficiency. Summary of the invention

[0005] In view of the deficiencies of the prior art, the object of the present invention is to provide a multi-layer microfilter filter assembly to solve the problems faced by the above-mentioned background technology.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A multi-layer microfilter filter assembly, comprising a metal frame provided on a filter cartridge, the filter cartridge being connected to the metal frame via a pressing plate, a filter screen being laid under the metal frame, and connecting through holes being provided around the metal frame, the connecting through holes cooperating with bolts provided on the pressing plate;

[0008] The metal skeleton comprises an outer frame, on which a plurality of inner circle meshes distributed in a chessboard shape are arranged, each of the inner circle meshes is connected to the outer frame through connecting plates arranged vertically and horizontally, and outer circle meshes are arranged around the inner circle meshes.

[0009] Furthermore, the outer ring mesh is surrounded by a continuous gradient curve edge, a straight line edge and a connecting plate provided on the outer frame, and the continuous gradient curve edge is tangent to the straight line edge.

[0010] Furthermore, the ratio of the radial side length of the continuous gradient curve side to the straight side length is 1:1.

[0011] Furthermore, the filter screen is composed of a multi-layer structure, and the filter screen is provided with a first protective layer, a metal filter cloth layer and a second protective layer in sequence from the outside to the inside.

[0012] Furthermore, the metal skeleton and the filter screen are sintered into one body, and the metal skeleton is a single-chip module structure.

[0013] Beneficial effects of the present invention:

[0014] The filter assembly of the present invention has high strength, reliable structure, large processing flux, stable effluent water quality, and stable equipment operation. By designing the edge of the outer ring mesh of the metal skeleton as a continuous gradient curve edge, the force support area of ​​the metal skeleton is increased, and the force is gradually decomposed, linear stress concentration is avoided, the probability of cutting and fracture is reduced, and the structural strength is improved, thereby increasing the service life of the filter. At the same time, a multi-layer metal filter cloth protection structure is designed to ensure the structural strength of the filter and effectively attach suspended matter, thereby ensuring the effluent water quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the structure when the metal frame and the filter mesh are matched;

[0018] Figure 3 It is a schematic diagram of the structure of the filter;

[0019] Figure 4 It is a process principle diagram when the present invention works.

[0020] Description of the numbers in the figure:

[0021] 1. Metal skeleton; 2. Filter screen; 3. Filter cartridge; 4. Pressing plate; 12. Outer frame; 13. Inner circle mesh; 14. Connecting plate; 15. Outer circle mesh; 16. Connecting through hole; 17. Continuous gradient curve edge; 18. Straight line edge; 201. First protective layer; 202. Metal filter cloth layer; 203. Second protective layer. DETAILED DESCRIPTION

[0022] 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.

[0023] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0024] The sewage type treated in this example is black and smelly river water, and the sewage inflow of the river is 10000m 3 / d, inlet SS≤50mg / L, designed outlet water quality standard SS≤10mg / L, using microfilter to filter suspended matter and other impurities. This embodiment improves a multi-layer structure of microfilter filter assembly, such as Figure 1 , Figure 2 As shown, it includes a metal skeleton 1 arranged on the filter cartridge 3, and the metal skeleton 1 is connected to the filter cartridge 3 through a pressing plate 4. A filter screen 2 is laid under the metal skeleton 1. Connecting through holes 16 are arranged around the metal skeleton 1, and the connecting through holes 16 cooperate with bolts arranged on the pressing plate 4. The metal skeleton 1 and the filter screen 2 are sintered into one body, and the metal skeleton 1 is a single-chip module structure. The sintering method is adopted to make it have high mechanical strength and increase stability. The metal skeleton 1 is a single-chip module structure and can be installed in blocks on the microfilter cartridge 3 for easy independent maintenance and replacement. The filter screen 2 is made of corrosion-resistant high-strength metal material, such as 316L stainless steel, which can increase the service life.

[0025] like Figure 2As shown, the metal skeleton 1 includes an outer frame 12, and a plurality of inner circle meshes 13 distributed in a chessboard shape are provided on the outer frame 12. The inner circle meshes 13 are connected to the outer frame 12 as a whole through connecting plates 14 arranged vertically and horizontally. The inner circle meshes 13 are surrounded by outer circle meshes 15, and the outer circle meshes 15 are surrounded by a continuous gradient curve edge 17, a straight line edge 18 and the connecting plates 14 provided on the outer frame 12, and the continuous gradient curve edge 17 is tangent to the straight line edge 18, and the ratio of the radial edge length of the continuous gradient curve edge 17 to the length of the straight line edge 18 is 1:1. The continuous gradient curve edge 17 can be one of a circular arc, an involute curve, a spline curve, etc., and it is recommended to adopt The arc edge is designed to increase the stress area of ​​the metal frame 1 to withstand the pressing force of the pressure plate 4 and the weight of the sewage, and the stress can be gradually decomposed, which is not easy to cause stress concentration, thus avoiding the breakage of the metal frame 1. At the same time, the contact surface between the outer ring mesh 15 and the filter 2 is increased, thereby avoiding the shearing effect of the right-angle and straight-line edges on the filter 2, and improving the structural strength of the filter 2; the inner ring mesh 13 of the metal frame 1 can be rectangular, square, diamond, etc., preferably square, and the area of ​​the filter 2 can be controlled by controlling the area of ​​a single inner ring mesh 13 to achieve sufficient structural strength. Here, the inner ring mesh 13 is designed to be a 20mm×20mm square with an area of ​​about 400mm 2 .

[0026] like Figure 3 As shown, the filter screen 2 is composed of a multi-layer structure. The filter screen 2 is provided with a first protective layer 201, a metal filter cloth layer 202 and a second protective layer 203 from the outside to the inside. The first protective layer 201 and the second protective layer 203 are woven with metal wires, which can prevent the metal filter cloth layer 202 from falling off and prevent the outer frame 12 from cutting the metal filter cloth layer 202 in diameter, thereby improving the structural strength of the overall filter screen 2. The mesh length is generally 0.5-1 mm, preferably 0.85 mm, and the wire diameter is generally 0.2-0.4 mm, preferably 0.3 mm. The second protective layer 203 can also allow the filtered suspended matter, impurities, etc. to adhere to it and separate from the sewage, so that the sewage is purified and discharged; the metal filter cloth layer 202 can adopt one of the forms of plain weave, twill weave, etc., and its mesh number is generally determined according to the water quality requirements of the inlet and outlet water, and generally 200-400 meshes are selected.

[0027] The filter assembly rotates with the microfilter cartridge 3 and repeatedly enters the sewage, repeatedly bearing the weight of the sewage, and the pressure plate 4 is fixed on the outer ring of the metal frame 1, causing the edge of the outer ring mesh 15 on the metal frame 1 to become a stress concentration point. If the shape of the outer ring mesh 15 is designed to be square, the connection edge between the outer ring mesh 15 and the outer frame 12 becomes a straight line, which becomes a linear stress concentration point, which is easy to cause the metal frame 1 to break here. Therefore, it is designed to be a continuous gradual curve edge 17, such as an arc edge, which can increase the force area of ​​the metal frame 1 to bear the pressing force of the pressure plate 4 and the weight of the sewage, and can gradually decompose the force, which is not easy to cause stress concentration, thereby avoiding the breakage of the metal frame 1. At the same time, the contact surface between the outer ring mesh 15 and the filter 2 is increased, thereby avoiding the shearing effect of the right-angle connection edge on the filter 2, and improving the structural strength of the filter 2. The filter 2 and the surrounding frame connecting plate 14 in the inner ring mesh 13 are subjected to symmetrical tension on both sides, and the force is relatively uniform, and the probability of damage is small, so there is no need to change the shape of the inner ring mesh 13. In addition, the mesh holes on the metal skeleton 1 divide the filter 2 into a plurality of separate filtering units, which can support the filter 2. By controlling the area of ​​a single mesh hole, the area of ​​the filter 2 can be controlled. If the area is too large, the spacing between the supporting points of the filter 2 is too large and the strength is insufficient; if the area is too small, the loss of the effective filtering area is large. Controlling the area of ​​a single mesh hole can effectively exert the filtering effect of the filter 2 and increase the service life of the filter 2.

[0028] The working process of this filter assembly: Figure 4 As shown, the filter cartridge 3 of the microfilter rotates, driving the metal frame 1 fixed on the filter cartridge 3 to rotate, and the water entering the microfilter passes through the second protective layer 203, is filtered by the metal filter cloth layer 202, and then flows out from the first protective layer 201. Impurities such as suspended matter are intercepted by the metal filter cloth layer 202 and attached to the second protective layer 203, so as to be separated from the sewage.

[0029] The filter screen 2 rotates with the filter cartridge to the top of the equipment, and the backwash water sprays downward, passes through the filter screen 2 from the metal frame 1, washes away the impurities attached to the second protective layer 203, restores the processing flux of the filter screen 2, and repeats in sequence to perform filtering.

[0030] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A multi-layer microfiltration filter assembly, comprising a metal frame (1) arranged on a filter cartridge (3), characterized in that: The metal frame (1) is connected to the filter cartridge (3) via a pressing plate (4); a filter screen (2) is provided below the metal frame (1); connecting through holes (16) are provided around the metal frame (1); the connecting through holes (16) cooperate with bolts provided on the pressing plate (4); The metal frame (1) comprises an outer frame (12), the outer frame (12) being provided with a plurality of inner circle mesh holes (13) distributed in a chessboard pattern, each of the inner circle mesh holes (13) being connected to the outer frame (12) via connecting plates (14) arranged vertically and horizontally, and outer circle mesh holes (15) being provided around the inner circle mesh holes (13); The outer ring mesh (15) is surrounded by a continuous gradient curve edge (17) and a straight line edge (18) provided on the outer frame (12), and the continuous gradient curve edge (17) is located outside the straight line edge (18); The filter screen (2) is composed of a multi-layer structure, and the filter screen (2) is provided with a first protective layer (201), a metal filter cloth layer (202), and a second protective layer (203) in sequence from the outside to the inside; The ratio of the distance between the two end points of the continuous gradient curve edge (17) to the length of the straight line edge (18) is 1:

1.

2. A multi-layer microfilter filter assembly according to claim 1, characterized in that: The metal skeleton (1) and the filter screen (2) are sintered into one body, and the metal skeleton (1) is a single-piece module structure.

3. A multi-layer microfilter filter assembly according to claim 1, characterized in that: The filter screen (2) is made of a corrosion-resistant high-strength metal material.

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