Filtering device

Abstract

The utility model discloses a filtering device, which belongs to the technical field of oil filtering, solves the technical problem of low purity of subsequent feed liquid caused by poor filtering effect of the existing filtering device, and comprises at least one filtering element, the filtering element comprises two filtering discs, and the edges of the two filtering discs are hermetically connected. Each filter disc comprises an upstream surface located on the outer side of the corresponding filter element and a downstream surface opposite to the upstream surface, corrugations are arranged on the upstream surfaces and the downstream surfaces, each filter disc is further provided with a center hole, and the part, located around the center hole, of each filter disc is connected with the filter disc of the adjacent filter element in a sealed mode. The ripples comprise a plurality of wave crests and wave troughs which are alternately arranged, part of the wave troughs on the downstream surface are cut off by the center hole to form sub-wave troughs located on the two sides of the center hole, the filter disc is provided with a changing area surrounding the center hole, and the changing area extends outwards in the radial direction from the edge of the center hole. The depth of the part, located in the change area, of the sub-trough is gradually shallower towards the direction of the center hole. Therefore, the resistance of the impurities flowing to the central hole can be increased, and the impurities are prevented from entering the central hole and flowing into subsequent feed liquid, so that the filtering effect is improved, the purity of the subsequent feed liquid is improved, repeated filtering is not needed, and the filtering cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil filtering, in particular to a filtering device. Background Art

[0002] In the prior art, the lubricating oil used in the gearbox of a wind turbine generator will produce impurities after long-term use. The impurities include moisture, self-oxidized sludge, mechanical wear particles, etc. The presence of impurities will cause the friction coefficient of the bearing to increase, thereby further aggravating the wear of the bearing and thus shortening the service life of the bearing.

[0003] To address the aforementioned technical issues, prior art US4549963A discloses a filter device for filtering lubricating oil to reduce impurities. The filter device includes at least one filter element, which comprises two filter discs of identical structure and sealed at their edges. The filter discs include an upstream surface located outside the filter element and a downstream surface disposed opposite the upstream surface. Both the upstream and downstream surfaces are corrugated, each comprising a plurality of alternating peaks and troughs. The filter discs also have a central aperture, with some of the troughs interrupted by the central aperture. The portion of the filter disc surrounding the central aperture is sealed to the filter disc of an adjacent filter element. When filtering lubricating oil containing impurities, the lubricating oil penetrates from the upstream surface of the filter disc into the downstream surface of the filter disc, removing most of the impurities. The filtered liquid then exits the filter element through the central aperture.

[0004] Since the liquid entering the downstream surface of the filter disc contains impurities that have not been filtered out, the impurities will flow into the center hole along with the liquid and then flow into the subsequent liquid. This will cause the purity of the subsequent liquid to decrease, requiring multiple filtrations, thereby increasing the filtration cost. Utility Model Content

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a filtering device that can increase the resistance of impurities to the flow of impurities toward the center hole, so as to reduce the impurities from entering the center hole and flowing into the subsequent feed liquid, thereby improving the filtering effect and the purity of the subsequent feed liquid, eliminating the need for multiple filtrations and reducing the filtering cost.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A filtering device comprises at least one filter element, wherein the filter element comprises two filter discs with sealed edges, the filter disc comprising an upstream surface located on the outside of the filter element and a downstream surface arranged opposite to the upstream surface, the upstream surface and the downstream surface are both provided with corrugations, and the filter disc is also provided with a center hole, the portion of the filter disc located around the center hole is sealedly connected to the filter disc of the adjacent filter element, the corrugations comprise a plurality of alternating peaks and troughs, some of the troughs on the downstream surface are cut off by the center hole to form sub-troughs located on both sides of the center hole, the filter disc has a changing zone surrounding the center hole, the changing zone extends radially outward from the edge of the center hole, and the depth of the portion of the sub-trough located in the changing zone gradually becomes shallower toward the center hole.

[0008] When the filter device of the present invention is filtering, the feed liquid that has penetrated into the downstream surface of the filter disc will flow to the central hole to discharge the filter element. In the process of flowing to the central hole, since the depth of the part of the sub-trough located in the change zone gradually becomes shallower toward the central hole, the part of the flow channel inside the filter element corresponding to the sub-trough will also gradually become smaller toward the central hole. The impurities in the fluid on the downstream surface of the filter element are themselves at a lower level. The small amount of remaining impurities can be adsorbed and retained in this part to a greater extent under the obstruction of the slope formed after the trough becomes shallower, thereby achieving the purpose of reducing the impurities from entering the central hole and flowing into the subsequent feed liquid, thereby improving the filtering effect and the purity of the subsequent feed liquid, eliminating the need for multiple filtrations, and reducing the filtering cost. In addition, during filtering, since the penetration rate of the edge of the filter disc is higher than the penetration rate of the part of the filter disc located around the central hole, the edge of the filter disc is easy to reach The filter element has a narrower filter area than the filter element, so the filter element will have a narrower filter area than the filter element, and the filter element will have a narrower filter area than the filter element.

[0009] The central hole truncates some of the wave crests on the downstream surface, forming sub-peaks on either side of the central hole. The height of the sub-peaks within the transition zone gradually decreases toward the central hole. This design allows adjacent wave valleys near the central hole within the filter element to connect, preventing blockage caused by a narrow flow path on the filter disc near the central hole and balancing flow losses within the filter disc.

[0010] The outer diameter of the changing zone is R, and the outer diameter of the filter disc is R1, satisfying 0.2≤R / R1≤0.3. Since the outer diameter of the changing zone corresponds to the inclination of the sub-valley bottom, when the thickness of the filter disc, the maximum depth of the sub-valley, and the depth of the connection with the center hole are not changed, the larger the outer diameter of the changing zone, the smaller the inclination, and an overly flat sub-valley bottom is less effective in retaining impurities; and if the outer diameter of the changing zone is too small, although the inclination increases, the inclined area or length becomes smaller, and impurities do not have enough inclined areas in the sub-valley to be retained. Therefore, this technical solution can improve the retention effect of impurities and retain enough impurities by reasonably limiting the R / R1 ratio.

[0011] The peaks on the downstream surface are staggered with the peaks on the upstream surface, and the width of the peaks on the downstream surface is greater than the width of the peaks on the upstream surface. If the peaks on the downstream surface of the same filter disc are arranged opposite to the peaks on its upstream surface, the troughs on the downstream and upstream surfaces will be opposite. In this way, the portion corresponding to the trough will be compacted during the processing of the filter disc, resulting in a smaller gap at the trough, thereby reducing the filtration rate at the trough. Since the peaks are not squeezed, the gaps are larger, so the filtration rate at the peaks is higher, resulting in unbalanced filtration of various parts of the filter disc. The present technical solution is not only conducive to improving the support effect between the filter discs and improving the overall strength of the filter element to reduce the glue coating area; it can also prevent the filter disc from being partially compacted, thereby increasing the liquid inlet rate; it can also increase the height of the peaks on the upstream surface by staggering the setting, thereby increasing the liquid inlet channel and improving the liquid inlet rate.

[0012] The downstream surface has a first region consisting of sub-troughs and peaks between the sub-troughs, and a second region consisting of the remaining regions. The projection of the first region of the downstream surface of one filter disc on the downstream surface of another filter disc in the same filter element overlaps with the second region of the filter disc. This design allows the troughs on the downstream surfaces of the two filter discs in the filter element to be arranged crosswise, so that liquid filtered through the filter disc from the second region can flow smoothly into the central aperture through the trough channel in the first region of the opposing filter disc, reducing the flow resistance of the filtered fluid in this portion and improving overall filtration efficiency. Furthermore, the smaller overlap between the sub-troughs between the two filter discs in the same filter element can also increase the distribution area of ​​the sub-troughs in the filter element, improving the uniformity of the sub-trough distribution. Finally, for the perpendicular cross-arrangement, the circumferential flow channel of the central aperture can be reduced toward the central aperture, thereby improving the permeation efficiency of the portion surrounding the central aperture and maintaining a balanced filtration efficiency for the entire filter disc.

[0013] The trough width on the downstream surface is smaller than that on the upstream surface. This design allows the upstream surface to have a larger space than the downstream surface, which helps increase the impurity holding capacity on the upstream surface and improve the overall loading capacity.

[0014] The filtering device includes at least two axially sealed stacked filter elements, the upstream surface has a first sealing plane arranged around the center hole, the ratio of the protruding height of the first sealing plane to the height of the upstream surface peak is 0.8 to 1.5, and the first sealing planes on the adjacent filter discs of the two adjacent filter elements are adhesively sealed. If the first sealing plane is much higher than the peak of the upstream surface, it is difficult for the peaks to contact each other and form support between the upstream surfaces of adjacent filter elements, which will cause the strength of the filter element composed of the filter elements to be too low; and if the first sealing plane is much lower than the peak of the upstream surface, then too much sealant is required to coat and seal the first sealing planes between adjacent filter elements, and the excessive thickness of the sealant coating is more troublesome in preparation, and too much sealant is likely to spread into the center hole or the trough, resulting in loss of filtration area. To this end, the ratio of the protruding height of the first sealing plane to the height of the wave crest on the upstream surface is limited to 0.8 to 1.5, which not only ensures that the wave crests of the filter discs on adjacent filter elements contact and support each other, but also effectively reduces the amount of sealant used to reduce the loss of filtration area. The edge of the downstream surface has a second sealing plane arranged around the central hole, and the ratio of the protruding height of the second sealing plane to the maximum height of the wave crest on the downstream surface is 0.8 to 1.5. The two second sealing planes in the same filter element are bonded and sealed. This design allows multiple filter elements to be stacked, and the filtered liquid inside each filter element is discharged through the central hole, making the overall structure relatively simple. In addition, if the second sealing plane is much higher than the wave crest on the downstream surface, the distance between the wave crests on the downstream surface of the two filter discs in the same filter element is too large. During the filtration process, when the filtration pressure increases, the filter disc is easily collapsed. The larger the distance between the wave crests on the downstream surface of the two filter discs in the same filter element, the more serious the damage caused by the filter disc collapse. When the distance between the wave crests on the downstream surface of the two filter discs in the same filter element is controlled within an appropriate distance, Even if the filter disc is collapsed, it is not easy to cause excessive damage to the filter disc; if the second sealing plane is much lower than the wave peak of the downstream surface, then too much sealant will be needed to coat and seal the second sealing plane, and the excessive thickness of the sealant coating will make the preparation more troublesome, and too much sealant will easily spread into the adjacent wave valleys, causing loss of filtration area. For this reason, the ratio of the protruding height of the second sealing plane to the maximum height of the wave peak of the downstream surface is limited to 0.8-1.5, which can not only avoid excessive damage to the filter disc when the filtration pressure becomes large, but also effectively reduce the amount of sealant used to reduce the loss of filtration area.

[0015] The wave peak bonding on the two adjacent filter discs of two adjacent filter elements can increase the number of bonding points through wave peak bonding, thereby improving the bonding stability of the two adjacent filter elements, that is, improving the strength of the filter elements; in addition, the hardening of the glue after curing will also improve the supporting performance; or, the width of the second sealing plane is smaller than the width of the first sealing plane. In this design, the larger the width of the first sealing plane, the more conducive it is to improving the stability of the abutment between the central parts of the two adjacent filter discs of the adjacent filter elements, and the less likely it is to deform; and the smaller the width of the second sealing plane, the smaller the sealing area can be, so as to increase the filtration area of ​​the filter disc, thereby improving the filtration efficiency.

[0016] The outer diameter of the first sealing plane is R2, and the outer diameter of the changing zone is R, satisfying 0.8≤R2 / R≤1.5. When the outer diameter of the changing zone is the same as the outer diameter of the first sealing plane, or differs within a small range, this prevents excessive differences in filtration resistance at different radial locations of the filter disc due to an excessively large changing zone, thereby preventing low filtration efficiency and low utilization of the filter disc's filtration area. It also prevents the outer diameter of the changing zone from being too small, resulting in an excessively short length of the inclined trough portion, which would impair the retention and blocking of impurities remaining in the filtered fluid.

[0017] The ratio of the upstream surface's peak width to the upstream surface's trough width is 1 to 3. With this design, a suitable peak-to-trough width ratio can effectively balance the amount of dirt held and the filtration flow rate, improving overall filtration efficiency and capacity. Alternatively, the ratio of the downstream surface's peak width to the downstream surface's trough width is 3 to 5. A larger peak width on the downstream surface increases the effective filtration space for fluid passing through the filter disc, improving filtration effectiveness. However, the trough width cannot be too small, ensuring an appropriate flow rate for the filtration flow to ensure filtration efficiency. This technical solution balances overall filtration effectiveness and efficiency.

[0018] The end surface of the downstream surface trough near the edge of the filter disc is parallel to the axis of the central hole, or the angle between the two is less than 30 degrees. This design allows the end surface of the trough near the edge of the filter disc to be vertical or perpendicular, so that residual impurities in the liquid after filtration are more easily retained there, thereby improving the purity of the filtered liquid at the rear end.

[0019] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings:

[0021] Figure 1 This is a cross-sectional view of the filter device in Example 1 of the present utility model;

[0022] Figure 2This is a schematic structural diagram of the downstream surface of the filter disc in Example 1 of the present utility model;

[0023] Figure 3 This is a cross-sectional view of the filter element in Example 1 of the present utility model;

[0024] Figure 4 for Figure 3 A partial enlarged schematic diagram;

[0025] Figure 5 for Figure 3 A partial enlarged schematic diagram of B in the middle;

[0026] Figure 6 for Figure 3 A partial enlarged schematic diagram of center C;

[0027] Reference numerals:

[0028] 100. Filter element; 110. Filter disc; 111. Upstream surface; 1110. First sealing plane; 112. Downstream surface; 1120. Second sealing plane; 1121. End face; 113. Center hole; 114. Change zone; 115. First zone; 120. Corrugation; 121. Peak; 1211. Sub-peak; 122. Valley; 1221. Sub-valley. DETAILED DESCRIPTION

[0029] The utility model provides a filtering device, comprising at least one filter element, wherein the filter element comprises two filter discs with sealed edges, the filter disc comprising an upstream surface located on the outside of the filter element and a downstream surface arranged opposite to the upstream surface, the upstream surface and the downstream surface are both provided with corrugations, the filter disc is also provided with a center hole, the portion of the filter disc located around the center hole is sealedly connected to the filter disc of the adjacent filter element, the corrugations comprise a plurality of alternating peaks and troughs, some of the troughs on the downstream surface are cut off by the center hole to form sub-troughs located on both sides of the center hole, the filter disc has a changing zone surrounding the center hole, the changing zone extends radially outward from the edge of the center hole, and the depth of the portion of the sub-trough located in the changing zone gradually becomes shallower toward the center hole.

[0030] When the filter device of the present invention is filtering, the feed liquid that has penetrated into the downstream surface of the filter disc will flow toward the central hole to discharge from the filter element. In the process of flowing toward the central hole, since the depth of the part of the sub-wave trough located in the change area gradually becomes shallower toward the central hole, the part of the flow channel inside the filter element corresponding to the sub-wave trough will also gradually become smaller toward the central hole, thereby increasing the flow resistance of impurities, achieving the purpose of reducing impurities from entering the central hole and flowing into the subsequent feed liquid, improving the filtering effect and the purity of the subsequent feed liquid, eliminating the need for multiple filtrations, and reducing the filtering cost; in addition, during filtering, since the penetration rate of the edge of the filter disc is higher than that of the part of the filter disc located around the central hole The permeation rate is increased, and therefore the edge of the filter disc is prone to saturation. This will not only reduce the filtration efficiency of the filter disc, but also shorten the service life of the filter disc. In the present invention, the depth of the sub-trough portion located in the change zone is designed to gradually become shallower toward the center hole. The portion of the internal flow channel of the filter element corresponding to the sub-trough can gradually become smaller toward the center hole, thereby accelerating the flow of the filtrate to the center hole. This can increase the permeation rate at the edge of the center hole, balance the overall permeation rate of the filter disc, and thus improve the filtration efficiency. In addition, the overall balanced permeation rate of the filter disc can also avoid local saturation of the filter disc, thereby extending the service life of the filter disc.

[0031] The technical solutions of the embodiments of the present invention are explained and illustrated below in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all of them. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without making creative work all fall within the scope of protection of the present invention. In addition, it should be understood that the following words indicating orientation or positional relationship such as "up", "down", "left", "right", "longitudinal", "lateral", "inside", "outside", "vertical", "horizontal", "top", "bottom", etc. are only based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] Example 1

[0033] Reference Figures 1 to 6As shown, the filter device in this embodiment includes at least one filter element 100, which includes two filter discs 110. Each filter disc 110 includes an upstream surface 111 located outside the filter element 100 and a downstream surface 112 located opposite the upstream surface 111. Each filter disc 110 is provided with a central hole 113. The central holes 113 on each filter disc 110 are coaxial and of equal size. The edges of the two filter discs 110 are sealed together to form a flow channel for the flow of filtered liquid between the two filter discs 110. The portion of the filter disc 110 located around the central hole 113 is sealed together with the filter disc 110 of the adjacent filter element 100 so that the filtered liquid inside each filter element 100 can be discharged through the central hole 113. In addition, each upstream surface 111 and each downstream surface 112 is provided with corrugations 120. The corrugations 120 include a plurality of alternating crests 121 and troughs 122. The crests 121 have a curved cross-section, and the troughs 122 have a flat bottom surface. Part of the trough on the downstream surface 112 is cut off by the central hole 113 to form sub-troughs 1221 located on both sides of the central hole 113. The filter disc 110 has a change area 114 ( Figure 2 The changing zone 114 extends radially outward from the edge of the center hole 113, and the bottom surface of the portion of the sub-trough 1221 located in the changing zone 114 is gradually inclined upward toward the center hole 113, so that the depth of the portion of the sub-trough 1221 located in the changing zone 114 gradually becomes shallower toward the center hole 113.

[0034] When the filter device of this embodiment is filtering, the feed liquid that penetrates into the downstream surface of the filter disc 110 will flow to the central hole 113 and discharge from the filter element 100. In the process of flowing toward the central hole 113, since the depth of the sub-trough 1221 located in the change zone 114 gradually becomes shallower toward the central hole 113, the part of the internal flow channel of the filter element 100 corresponding to the sub-trough 1221 will also gradually become smaller toward the central hole 113. The impurities in the fluid on the downstream surface 112 of the filter element 100 are themselves at a lower level. The small amount of remaining impurities can be adsorbed and retained in this part to a greater extent under the obstruction of the slope formed after the trough 122 becomes shallower, thereby achieving the purpose of reducing the impurities from entering the central hole 113 and flowing into the subsequent feed liquid, thereby improving the filtering effect and the purity of the subsequent feed liquid, eliminating the need for multiple filtrations, and reducing the filtering cost; in addition, during filtering, since the permeation rate of the edge of the filter disc 110 is higher than the permeation rate of the part of the filter disc 110 located around the central hole 113, the edge of the filter disc 110 is easy to reach 113, thereby accelerating the flow of filtrate to the central hole 113. In this way, the permeation rate of the edge of the central hole 113 can be increased, so that the overall permeation rate of the filter disc 110 is balanced, thereby improving the filtration efficiency. In addition, the overall permeation rate of the filter disc 110 is balanced, and the filtration efficiency is improved. In addition, the overall permeation rate of the filter disc 110 is balanced, and the local saturation of the filter disc 110 is avoided, thereby extending the service life of the filter disc 110.

[0035] In addition, in this embodiment, part of the wave peaks 121 on the downstream surface 112 are also cut off by the center hole 113 to form sub-peaks 1211 located on both sides of the center hole 113. The height of the part of the sub-peak 1211 located in the change zone 114 gradually decreases toward the center hole 113, that is, the height difference between the part of the sub-peak 1211 located in the change zone 114 and the adjacent wave valley gradually decreases toward the center hole 113. Such a design can make the adjacent wave valleys 122 near the center hole 113 in the filter element 100 connected, thereby avoiding the flow channel on the filter disk 110 near the center hole 113 being too small and causing blockage, so as to balance the flow channel loss of the filter disk 110.

[0036] In this embodiment, the outer diameter of the changing region 114 is R, and the outer diameter of the filter disc 110 is R1, satisfying the condition 0.2≤R / R1≤0.3. Since the outer diameter R of the changing region 114 corresponds to the slope of the bottom surface of the sub-trough 1221, when the thickness of the filter disc 110, the maximum depth of the sub-trough 1221, and the depth at the connection with the center hole 113 remain unchanged, the larger the outer diameter R of the changing region 114, the smaller the slope. However, an overly flat bottom surface of the sub-trough 1221 is less effective in retaining impurities. On the other hand, if the outer diameter R of the changing region 114 is too small, the slope increases, but the sloped area, or length, decreases, leaving impurities with insufficient sloped area within the sub-trough for retention. Therefore, in this embodiment, by reasonably limiting the R / R1 ratio, impurity retention can be improved while retaining a sufficient amount of impurities. R / R1 can be 0.2, 0.25, 0.28, 0.3, etc.

[0037] If the peaks on the downstream surface 112 of the same filter disc 110 are arranged opposite to the peaks on its upstream surface 111, the troughs on the downstream surface 112 and upstream surface 111 will be opposite to each other. In this way, the portion corresponding to the trough will be compacted during the processing of the filter disc 110, resulting in smaller gaps in the troughs, which in turn reduces the filtration rate at the troughs. However, the peaks are not compressed, so the gaps are larger, resulting in a higher filtration rate at the peaks, which leads to unbalanced filtration in different parts of the filter disc. To avoid unbalanced filtration in different parts of the filter disc, in this embodiment, the peaks 121 on the downstream surface 112 are staggered with the peaks 121 on the upstream surface 111, and the width of the peaks 121 on the downstream surface 112 is greater than the width of the peaks 121 on the upstream surface 111. Such a design not only prevents the filter disc 110 from being partially compacted, thereby increasing the liquid inlet rate; it also increases the height of the wave crest 121 on the upstream surface 111 by staggering the setting, thereby increasing the liquid inlet channel and improving the liquid inlet rate; in addition, it can also help to improve the support effect between the filter discs 110, improve the overall strength of the filter element, and reduce the glue coating area.

[0038] In order to improve the overall filtering efficiency, in this embodiment, the downstream surface 112 has a first area 115 composed of a sub-trough 1221 and a peak (i.e., sub-peak 1211) between the sub-trough 1221, and a second area composed of the remaining other areas. The second area is the area where the downstream surface 112 is provided with corrugations, excluding the first area 115. The projection of the first area 115 of the downstream surface 112 of one filter disc 110 in the same filter element 100 on the downstream surface 112 of the other filter disc has an overlapping area with the second area of ​​the filter disc 110, that is, the troughs 122 of the downstream surfaces 112 of the two filter discs 110 in the same filter element 100 are cross-arranged rather than parallel, so that the liquid filtered through the filter disc 110 from the second area on the filter disc 110 can pass through the first area 115 on the opposite filter disc 110. The trough 122 channel of area 115 flows smoothly into the central hole 113, reducing the flow resistance of this part of the filtered fluid and improving the overall filtration efficiency; and the overlapping area between the sub-troughs 1221 between the two filter discs 110 in the same filter element 100 is smaller, which can also increase the distribution area of ​​the sub-troughs 1221 in the filter element 100 and improve the uniformity of the distribution of the sub-troughs 1221; when the troughs 122 of the downstream surfaces 112 of the two filter discs 110 in the same filter element 100 are vertically crossed, the overlapping area between the sub-troughs 1221 between the two filter discs 110 in the same filter element 100 is minimized, so that the circumferential flow channel of the central hole 113 can be reduced toward the central hole 113, so that the part around the central hole 113 can improve the permeation efficiency, so that the filtration efficiency of the entire filter disc 110 is in a balanced state.

[0039] In addition, if Figure 4 As shown, in this embodiment, the width W of the trough 122 on the downstream surface 112 is smaller than the width W1 of the trough 122 on the upstream surface 111. This design allows for a greater number of troughs distributed across the upstream surface 111, resulting in a larger space on the upstream surface 111 than on the downstream surface 112. This helps increase the impurity holding capacity of the upstream surface 111 and improves the overall loading capacity.

[0040] The ratio of the width W1 of the wave crest 121 of the upstream surface 111 to the width W2 of the wave trough 122 of the upstream surface 111 is 1 to 3. With this design, the appropriate ratio of the width of the wave crest 121 to the width of the wave trough 122 can effectively balance the amount of dirt held and the filtration flow rate, thereby improving the overall filtration efficiency and filtration capacity. The ratio of the width W of the wave crest 121 of the downstream surface 112 to the width W3 of the wave trough 122 of the downstream surface 112 is 3 to 5. The larger the width W of the wave crest 121 of the downstream surface 112, the larger the effective filtration space for the fluid to pass through the filter disc 110, thereby improving the filtration effect. The wave trough 122 cannot be too small and needs to provide a suitable flow rate for the filtration flow to ensure filtration efficiency. In other words, the limitation of this technical solution can balance the overall filtration effect and filtration efficiency.

[0041] like Figure 1 and 2 As shown, in order to achieve a sealed connection at the edges of the two filter discs 110, the edge of the downstream surface 112 in this embodiment has a second sealing plane 1120 arranged around the central hole 113. The ratio of the protruding height of the second sealing plane 1120 to the maximum height of the crest 121 on the downstream surface 112 (i.e., the height of the crest 121 protruding from the deepest part of the trough 122) is 0.8 to 1.5. The two second sealing planes 1120 in the same filter element 100 are bonded and sealed. Such a design can not only improve the edge sealing performance of the two filter discs 110, but also simplify the structure of the filter disc 110. In addition, if the second sealing plane 1120 is much higher than the wave crest 121 of the downstream surface 112, the distance between the wave crests 121 on the downstream surfaces of the two filter discs 110 in the same filter element 100 will be too large. During the filtration process, when the filtration pressure becomes large, the filter disc 110 is easily crushed. The greater the distance between the wave crests 121 on the downstream surfaces of the two filter discs 110 in the same filter element 100, the more serious the damage caused by the collapse of the filter disc 110. When the distance between the wave crests 121 on the downstream surfaces of the two filter discs 110 in the same filter element 100 is controlled within an appropriate distance, even if the filter disc 110 is crushed, it is not easy to cause excessive damage to the filter disc 110. damage; and if the second sealing plane 1120 is much lower than the wave crest 121 of the downstream surface 112, then too much sealant will be required to coat and seal the second sealing plane 1120, and a sealant coating that is too thick will be more troublesome in preparation, and too much sealant will easily spread into the adjacent wave troughs 122, causing loss of filtration area. For this reason, the ratio of the protruding height of the second sealing plane 1120 to the maximum height of the wave crest 121 of the downstream surface 112 is limited to 0.8-1.5, which can avoid excessive damage to the filter disc 110 when the filtration pressure becomes large, and can effectively reduce the amount of sealant used to reduce the loss of filtration area. For example, the ratio of the protruding height of the second sealing plane 1120 to the maximum height of the wave crest 121 of the downstream surface 112 can be 0.8, 1, 1.2, 1.5, etc.

[0042] The outer diameter of the first sealing plane is R2, and the outer diameter of the changing zone is R, satisfying 0.8≤R2 / R≤1.5. When the outer diameter R of the changing zone 114 is the same as or differs from the outer diameter R2 of the first sealing plane 1110 by a small margin, this prevents excessive differences in filtration resistance at different radial positions of the filter disc 110 due to an excessively large changing zone 114, thereby preventing low filtration efficiency and low utilization of the filter area of ​​the filter disc 110. Furthermore, this prevents the outer diameter of the changing zone 114 from being too small, resulting in an excessively short length of the inclined trough portion, which would impair the retention and blocking effect on impurities remaining in the filtered fluid. Therefore, R2 / R in this embodiment can be 0.8, 1, 1.2, 1.5, etc.

[0043] Furthermore, since the filtering device in this embodiment includes at least two axially sealed stacked filter elements 100, in order to achieve a sealed connection between the portion of the filter disc 110 located around the center hole 113 and the filter disc 110 of the adjacent filter element 100, the upstream surface 111 of each filter disc 110 in this embodiment has a first sealing plane 1110 arranged around the center hole 113, and the ratio of the height of the first sealing plane 1110 protruding from the upstream surface trough 122 to the height of the upstream surface peak 121 is 0.8 to 1.5, and the first sealing plane 1110 on the adjacent two filter discs 110 of the two adjacent filter elements 100 are bonded and sealed. With such a design, after multiple filter elements 100 are stacked, the filtered liquid inside each filter element 100 can be discharged through the central hole 113, and the overall structure is relatively simple; in addition, if the first sealing plane 1110 is much higher than the wave peak 121 of the upstream surface 111, it is difficult for the wave peaks 121 between the upstream surfaces 111 of adjacent filter elements 100 to contact each other and form support, which will cause the strength of the filter element composed of the filter elements 100 to be too low; and if the first sealing plane 1110 is much lower than the wave peak 121 of the upstream surface 111, then too much sealant is required to be coated and sealed between the first sealing planes 1110 between adjacent filter elements 100, and the excessive thickness of the sealant coating is more troublesome in preparation, and too much sealant is likely to spread into the central hole 113 or the wave valley 122, resulting in loss of filtration area. To this end, the ratio of the protruding height of the first sealing plane 1110 to the height of the wave peak 121 of the upstream surface 111 is limited to 0.8 to 1.5, which can not only ensure the contact support of the wave peak 121 of the filter disc 110 on the adjacent filter element 100, but also effectively reduce the amount of sealant used to reduce the loss of filtration area. For example, the ratio of the protruding height of the first sealing plane 1110 to the height of the wave peak 121 of the upstream surface 111 can be 0.8, 1, 1.2, 1.5, etc.

[0044] Preferably, the peaks 121 on the two adjacent filter discs 110 of the two adjacent filter elements 100 are bonded. The bonding of the peaks 121 can increase the number of bonding points, thereby improving the bonding stability of the two adjacent filter elements 100, that is, improving the strength of the filter elements 100; in addition, the hardening of the glue after curing will also improve the supporting performance.

[0045] Preferably, the width W4 of the second sealing plane 1120 is smaller than the width of the first sealing plane 1110 (i.e., the radius R2). The larger the width of the first sealing plane 1110, the more conducive it is to improving the stability of the abutment between the center parts of the two adjacent filter discs 110 of the adjacent filter elements 100, and the less likely it is to deform; and the smaller the width of the second sealing plane 1120, the smaller the sealing area can be, so as to increase the filtration area of ​​the filter disc 110 and thereby improve the filtration efficiency.

[0046] Finally, if Figure 6 As shown, in this embodiment, the angle α between the end surface 1121 at one end of the trough 122 of the downstream surface 112 close to the edge of the filter disc 110 and the axis of the center hole 113 is less than 30°. When α is equal to 0°, the end surface 1121 is parallel to the axis of the center hole 113. At this time, the end surface 1121 is set vertically. When α is between 0° and 30°, the end surface 1121 tends to be vertical. Such a design can make it easier for residual impurities in the feed liquid that reaches this end after filtration to be retained here, thereby improving the purity of the filtered liquid at the rear end.

[0047] It should be noted that the depth of the entire section of the sub-trough located in the change zone gradually becomes shallower toward the center hole; or, the section of the sub-trough located in the change zone includes a first section away from the center hole and a second section close to the center hole, and the depth of the second section gradually becomes shallower toward the center hole.

[0048] Similarly, the height of the entire section of the sub-wave peak located in the change zone gradually decreases toward the center hole; or, the section of the sub-wave peak located in the change zone includes a third section away from the center hole and a fourth section close to the center hole, and the height of the fourth section gradually decreases toward the center hole.

[0049] It is understandable that in other embodiments of the present invention, the trough may be a curved surface, while the top surface of the crest may be a plane; or both the crest and the trough may be curved surfaces.

[0050] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art will understand that the present invention includes, but is not limited to, the contents described in the accompanying drawings and the above specific embodiments. Any modifications that do not deviate from the functional and structural principles of the present invention are intended to be included within the scope of the claims.

Claims

1. A filter device, comprising at least one filter element, wherein the filter element comprises two filter discs with edges being sealed and connected, wherein the filter disc comprises an upstream surface located outside the filter element and a downstream surface arranged opposite to the upstream surface, wherein both the upstream surface and the downstream surface are provided with corrugations, and wherein the filter disc is further provided with a central hole, wherein a portion of the filter disc located around the central hole is sealed and connected to a filter disc of an adjacent filter element, It is characterized in that The corrugations include a plurality of alternately arranged crests and troughs, part of the troughs on the downstream surface are cut off by the center hole to form sub-troughs located on both sides of the center hole, the filter disc has a changing zone surrounding the center hole, the changing zone extends radially outward from the edge of the center hole, and the depth of the part of the sub-trough located in the changing zone gradually becomes shallower toward the center hole.

2. A filtering device as claimed in claim 1, It is characterized in that Part of the wave crests on the downstream surface are cut off by the central hole to form sub-wave crests located on both sides of the central hole, and the height of the part of the sub-wave crest located in the change zone gradually decreases toward the central hole.

3. A filtering device as claimed in claim 1, It is characterized in that The outer diameter of the changing zone is R, and the outer diameter of the filter disc is R1, satisfying 0.2≤R / R1≤0.

3.

4. A filtering device as claimed in claim 1, It is characterized in that The wave crests on the downstream surface are staggered with the wave crests on the upstream surface, and the width of the wave crests on the downstream surface is greater than the width of the wave crests on the upstream surface.

5. A filtering device as claimed in claim 1, It is characterized in that The downstream surface has a first area consisting of sub-troughs and peaks between the sub-troughs and a second area consisting of remaining other areas, and a projection of the first area of ​​the downstream surface of a filter disk in the same filter element on the downstream surface of another filter disk has an overlapping area with the second area of ​​the filter disk.

6. A filtering device as claimed in claim 1, It is characterized in that The width of the troughs on the downstream surface is smaller than the width of the troughs on the upstream surface.

7. A filtering device according to any one of claims 1 to 6, It is characterized in that The filtering device includes at least two axially sealed stacked filter elements, the upstream surface has a first sealing plane arranged around the center hole, the ratio of the protruding height of the first sealing plane to the height of the upstream surface wave peak is 0.8 to 1.5, and the first sealing planes on two adjacent filter disks of two adjacent filter elements are bonded and sealed; the edge of the downstream surface has a second sealing plane arranged around the center hole, the ratio of the protruding height of the second sealing plane to the maximum height of the downstream surface wave peak is 0.8 to 1.5, and the two second sealing planes in the same filter element are bonded and sealed.

8. A filtering device as claimed in claim 7, It is characterized in that The wave peaks on two adjacent filter discs of two adjacent filter elements are bonded; or the width of the second sealing plane is smaller than the width of the first sealing plane.

9. A filtering device as claimed in claim 7, It is characterized in that The outer diameter of the first sealing plane is R2, and the outer diameter of the changing area is R, satisfying 0.8≤R2 / R≤1.

5.

10. A filtering device according to any one of claims 1 to 6, It is characterized in that The ratio of the wave crest width of the upstream surface to the wave trough width of the upstream surface is 1-3; or, the ratio of the wave crest width of the downstream surface to the wave trough width of the downstream surface is 3-5.

11. A filtering device according to any one of claims 1 to 6, It is characterized in that The end surface of the trough of the downstream surface close to the edge of the filter disc is parallel to the axis of the central hole, or the angle between the two is less than 30°.

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