CN104190133A - High-strength high-performance filter element - Google Patents

Abstract

The invention belongs to the technical field of filtering devices and discloses a high-strength and high-performance filter core. The filter element includes an upper end cover, a lower end cover, a central tube, and a filter cartridge arranged on the periphery of the central tube. The upper end cover and the lower end cover are respectively arranged at the upper and lower ends of the filter cartridge and the central tube. A filter layer and a wave-shaped metal mesh; the inside and outside of the wave-shaped filter layer are provided with the wave-shaped metal mesh; the filter layer is formed by stacking a glass fiber felt layer, a glass fiber filter paper layer and a non-woven fabric layer in sequence; The non-woven fabric layer is close to the center pipe; the body of the center pipe is a narrow steel strip wound in a dislocation spiral, the upper narrow steel strip is consolidated with the lower narrow steel strip, and extrusion holes are arranged along its length. The invention has reasonable design, simple structure, and high strength and safety of the filter element, which not only ensures the filtering accuracy of the filter, but also better improves the filtering efficiency of the filter, prolongs the service life and other performances.

Description

A high-strength high-performance filter element

technical field

The invention belongs to the technical field of filtering devices, and in particular relates to a high-strength and high-performance filter element.

Background technique

With the development of hydraulic technology, people pay more and more attention to the control of oil pollution degree of hydraulic system. Filters, as an important component to control oil pollution, are more and more widely used in hydraulic systems. The core component of the filter is the filter element, and the flow resistance and service life of the filter are directly determined by the performance of the filter element.

Filter element damage is common in the following situations:

1. Expansion: Hydraulic filters generally specify the direction of oil flow (that is, oil inlet and outlet), and the filter element can only bear pressure in one direction. When the direction of the filter inlet and outlet is reversed, the filter element will Under the reverse pressure, and its reverse pressure bearing capacity is very low, it is easy to make the filter element expand, even burst, and lose the filtering effect. At the same time, when the pressure at the oil outlet of the filter is too high, there will be oil recoil in the hydraulic system, which will also cause the filter element to expand.

2. Flattening: The filter element is used as an element to actually filter pollutants. As the intercepted pollutants increase, the pressure drop generated by the oil passing through the filter element increases. When the pressure drop reaches a certain level, the filter element should be replaced or cleaned in time, otherwise, The increasing pressure drop experienced by the filter element will cause the filter element to be crushed. In addition, if there is an instantaneous large flow impact in the system, such as the rapid unloading of the hydraulic cylinder, resulting in excessive flow, or the cold start of the system at low temperature, resulting in an instantaneous increase in pressure drop, the filter element may be crushed .

3. Damage to the filter material: The function of the filter is to filter out the micro particles in the hydraulic system. The source of these particles is mainly attributed to the following four aspects: (1) The new oil is not clean; (2) The new oil in the hydraulic system pollutants; (3) residual pollutants in the hydraulic system; (4) environmental pollution. The filter element is the element that actually filters pollutants. During use, the micro particles deposited on the filter paper continue to accumulate, block the filter holes, and reduce the filtration efficiency; as the intercepted pollutants increase, the pressure drop generated by the oil passing through the filter element increases. , when a certain part of the filter paper is crushed, the microparticles in the liquid will directly pass through there, reducing the filtration accuracy of the filter, and will be brought into the friction surface of the kinematic pair with the flow of hydraulic oil in the system, accelerating The wear of parts reduces the service life of the transmission system.

In addition, in the existing technology, the filter layer that plays a filtering role is filter paper, but the filter paper is easily broken and damaged during use, and the filtration accuracy and efficiency are affected to a certain extent; the strength of the central tube that plays a supporting role is low, Liquid permeability is not high.

Contents of the invention

In order to overcome the shortcomings and deficiencies of the prior art, the purpose of the present invention is to provide a high-strength and high-performance filter element, which not only ensures the filtration accuracy of the filter, but also improves the filtration efficiency and service life of the filter.

The object of the present invention is achieved through the following technical solutions:

A high-strength and high-performance filter element, including an upper end cover, a lower end cover, a central tube and a filter cartridge arranged on the periphery of the central tube, the upper end cover and the lower end cover are respectively arranged at the upper and lower ends of the filter cartridge and the central tube, and the filter The cylinder includes a wave-shaped filter layer and a wave-shaped metal mesh; the inside and outside sides of the wave-shaped filter layer are provided with the wave-shaped metal mesh.

The filter layer is composed of a glass fiber felt layer, a glass fiber filter paper layer and a non-woven fabric layer stacked in sequence; the non-woven fabric layer is close to the central pipe.

The tube body of the central tube is a narrow steel strip wound in a dislocation spiral, the upper narrow steel strip is consolidated with the lower narrow steel strip, and extrusion holes are arranged along its length.

The extruding hole is a hollow columnar protrusion; a hole is arranged on the cylindrical surface and communicates with the bottom of the columnar protrusion, so that the extruding hole is a through hole.

The extrusion hole is preferably a hollow cuboid, one of the four sides of the cuboid or two opposite sides communicate with the bottom to form a through hole, and the top four corners of the cuboid are rounded.

The high-strength and high-performance filter element also includes an upper end cap fitting and a sealing ring; the sealing ring is arranged between the upper end cap fitting and the upper end cap, and the upper end cap fitting is arranged on the upper end of the central tube and the filter cartridge And lightly overfit with the upper end cap.

The sealing ring is an O-ring and is processed from fluorine-containing rubber.

The upper and lower ends of the central tube and the cylinder are respectively bonded to the upper end cap fitting and the lower end cap through an adhesive; the upper end cap is bonded to the upper end cap fitting through an adhesive.

The filter cartridge is formed by stacking the metal mesh and the filter layer flatly and then folding them into a wave shape by an origami machine, and then bonding the end and the end of the wave-shaped metal mesh and the filter layer with an adhesive.

The fillet (r) of the flange of the upper end cover of the filter element and the fillet (R) of the upper flange of the upper end cover are smaller, and the gap between the two is small when combined, and the seal ring (O-ring) The rear is more compact and plays a better sealing role.

The upper end cover, upper end cover accessories, central pipe, filter cartridge and lower end cover are coaxial.

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

(1) The central tube of the filter element is a spiral squeeze filter central tube, and the tube body of the central tube is a narrow steel strip wound in a misplaced spiral. The upper narrow steel strip is fixedly connected to the lower narrow steel strip, and along its length There are extrusion holes in the direction. The narrow steel strip dislocation spiral coil structure effectively improves the rigidity of the center tube; the narrow steel strip is spirally wound to the required diameter, and the required length is cut by the spiral cutter of the equipment, which makes the processing easy; the extrusion through hole (extrusion Pressure hole) improves the strength of the central tube and the passage of the circulating medium. The extruded through hole is affected by the residual internal stress of its own elastic and plastic deformation, and has a tendency to expand outward, while the oil flows in from the outside to the inside, so that it is subjected to the external compressive stress in the radial direction. The external forces cancel each other out, reducing the stress on the central tube. Compared with punching, it improves the strength of the central tube; the two ends of the extruded through hole are transparent, which increases the flow performance of the liquid.

(2) The filter cartridge is to spread the filter material cut according to a certain size between two layers of black wire mesh of the same size, that is, the form of black wire mesh-filter material-black wire mesh, after laying, it will be folded by an origami machine Prepared by folding into a wave shape and then bonding end to end with adhesive. Compared with other methods, the advantages of folding the filter material into a wave shape in the present invention are: ① increasing the filtering contact area between the hydraulic oil and the filter material; ② increasing the dirt holding capacity of the filter element. In the present invention, the form of black wire mesh-filter material-black wire mesh is adopted, on the one hand to facilitate the folding and forming of the filter material on the origami machine, so that it is not easy to be damaged; on the other hand, it can strengthen the strength of the filter element.

(3) The filter layer is composed of three layers of different filter materials tiled and stacked, and the filter layer is composed of glass fiber felt, glass fiber filter paper and non-woven fabric. Among them, glass fiber filter paper is the main filter medium; glass fiber filter paper has low physical strength and high brittleness, and the filter material is easily damaged when it is mechanically folded into a filter layer. The glass fiber mat is placed between the metal mesh and the glass fiber filter paper, on the one hand, it protects the filter paper and prevents the glass fiber filter paper from being broken or broken by the upper metal mesh; on the other hand, the glass fiber mat has a tight structure, The pores are small, and its thickness is not limited in manufacture, so it can be used as a good filter material for coarse filtration of hydraulic oil. The non-woven fabric is placed between the glass fiber filter paper and the metal mesh. On the one hand, the non-woven fabric is the same as the glass fiber felt, which protects the glass fiber filter paper; on the other hand, the non-woven fabric has a certain tensile strength and filtering effect. After the glass fiber filter paper is damaged, prevent the oil in the oil inlet from directly entering the working element without being filtered.

(4) The O-ring is made of fluorine-containing rubber, which is suitable for a harsher working environment than the nitrile rubber sealing ring commonly used in filters.

Therefore, the present invention has reasonable design, simple structure, and high strength and safety of the filter element, which not only ensures the filtration accuracy of the filter, but also better improves the filtration efficiency and service life of the filter.

Description of drawings

Fig. 1 is a half-sectional view of the high-strength and high-performance filter element involved in the present invention; wherein 4-central tube, 5-filter cartridge, 6-lower end cap;

Figure 2 is a partial enlarged view of A in Figure 1; wherein 1-upper end cover, 2-sealing ring, 3-upper end cover accessories, 51-filter layer, 52-metal mesh;

Fig. 3 is the partially expanded view of the filter cartridge of the high-strength high-performance filter element involved in the present invention; Fig. 3 (a) is the sectional view of described filter cartridge, and Fig. 3 (b) is the partial expanded view of described filter cartridge, wherein 511- Glass fiber mat layer, 512-glass fiber filter paper layer, 513-non-woven fabric layer, 521-metal mesh, 522-metal mesh;

Fig. 4 is the central tube of the high-strength high-performance filter core involved in the present invention and a partially expanded view thereof; wherein Fig. 4 (c) is a schematic structural view of the central tube, and Fig. 4 (d) is a partially expanded perspective view of the central tube; wherein, 41 -Narrow steel strip, 42-extruded holes.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

As shown in Figures 1 to 4, a high-strength and high-performance filter element includes an upper end cover (1), a lower end cover (6), a central tube (4) and a filter cartridge (5) arranged on the periphery of the central tube (4) , the upper end cap (1) and the lower end cap (6) are arranged on the two ends of the filter cartridge (5) and the center pipe (4), and the filter cartridge (5) includes a wave-shaped filter layer (51) and a wave-shaped metal Net (52); The wave-shaped metal mesh (52) is provided on both sides of the wave-shaped filter layer (51);

The filter layer (51) is formed by stacking a glass fiber mat layer (511), a glass fiber filter paper layer (512) and a non-woven fabric layer (513) in sequence; the non-woven fabric layer (513) is close to the central tube (4 ); the wavy metal mesh (52) includes a wavy metal mesh (521) and a wavy metal mesh (522); the tube body of the central tube (4) is a narrow steel strip (41) wound by a dislocation spiral, The upper narrow steel strip is consolidated with the lower narrow steel strip, and extrusion holes (42) are arranged along its length direction.

The extrusion hole (42) is a hollow columnar protrusion, and holes are arranged on the cylinder surface, and the holes on the cylinder surface communicate with the bottom of the columnar protrusion, so that the extrusion hole is a through hole.

The extrusion hole (42) is a hollow cuboid, one side or two opposite sides of the four sides of the cuboid communicate with the bottom to form a through hole, and the top four corners of the cuboid are rounded.

The high-strength and high-performance filter element also includes an upper end cap fitting (3) and a sealing ring (2); the sealing ring (2) is arranged between the upper end cap fitting (3) and the upper end cap (1), and the The upper end cover fitting (3) is arranged on the upper ends of the central pipe (4) and the filter cartridge (5).

The upper and lower ends of the central tube (4) and the filter cartridge (5) are respectively bonded to the upper end cover fitting (3) and the lower end cover (6) by an adhesive; the upper end cover (1) is connected to the upper end The cover fitting (3) is bonded by adhesive.

The sealing ring (2) is an O-ring, which is processed from fluorine-containing rubber. The upper end cover (1), upper end cover accessories (3) and the lower end cover (6) have the same plate thickness, the upper end cover (1), upper end cover accessories (3), center tube (4), lower end cover (6) and filter cartridge (5) Coaxial.

The fillet (r) of the flange of the upper end cover fitting (3) and the fillet (R) of the upper flange of the upper end cover (1) are smaller, and the gap between the two is small when combined, and the sealing ring (O Type sealing ring) (2) is more compact and plays a better sealing role.

The center tube of the filter element is the center tube of a spiral squeeze filter. The narrow steel strip is spun into a misaligned helically coiled tube body under the action of a fully automatic spiral center tube rolling machine. The upper narrow steel strip is fixedly connected to the lower narrow steel strip, and extrusion holes are provided along its length. Moreover, the narrow steel strip is helically wound to the required diameter, and the required length is cut by the spiral cutter of the equipment, which makes the processing easy.

Preparation of the filter cartridge: spread the filter material (filter layer) cut according to a certain size between two layers of black wire mesh (metal mesh) of the same size, that is, the form of black wire mesh-filter material-black wire mesh, after clamping Under the action of the automatic origami machine, fold it into a wave shape. Specifically, the material is first laid on the origami machine board in the order of black wire mesh-filter material-black wire mesh, in which the filter material (filter layer) is formed by stacking three layers of different filter materials, and the stacking order is glass fiber mat , glass fiber filter paper and non-woven fabric; secondly, after setting a certain number of folds and depth, fold it into a wave shape by an origami machine; then cut the filter layer and metal mesh layer into a fixed number of folds, and finally use epoxy resin AB glue glues the end and end of the filter layer and the metal mesh layer together to form a wave-shaped filter cartridge.

The above embodiments are preferred embodiments of the present invention. Improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (8)

1. A high-strength, high-performance filter element is characterized in that: it comprises a central tube and a filter layer arranged on the periphery of the central tube, and the filter layer is formed by successively stacking a glass fiber felt layer, a glass fiber filter paper layer and a non-woven fabric layer , the non-woven fabric layer is close to the central tube. 2. The high-strength and high-performance filter element according to claim 1, characterized in that: the tube body of the central tube is a narrow steel strip wound in a dislocation spiral, and the upper narrow steel strip is consolidated with the lower narrow steel strip, along which Extrusion holes are arranged in the length direction. 3. The high-strength and high-performance filter element according to claim 2, characterized in that: the extrusion hole is a hollow cylindrical protrusion; the cylindrical surface is provided with a hole, which communicates with the bottom of the cylindrical protrusion, so that the extrusion hole is through hole. 4. The high-strength and high-performance filter element according to claim 1, characterized in that: the inner and outer sides of the filter layer are provided with metal mesh. 5. The high-strength and high-performance filter element according to claim 4, characterized in that: the filter layer and the metal mesh are wave-shaped. 6. The high-strength and high-performance filter element according to claim 1, further comprising an upper end cap and a lower end cap, the upper end cap and the lower end cap are arranged at both ends of the filter layer and the central tube. 7. The high-strength and high-performance filter element according to claim 1, characterized in that: it also includes an upper end cap fitting and a sealing ring; the sealing ring is arranged between the upper end cap fitting and the upper end cap, and the upper end cap fitting is set at the upper end of the central tube and filter layer. 8. The high-strength and high-performance filter element according to claim 7, wherein the sealing ring is made of fluorine-containing rubber.