Folded filter structure

Abstract

The utility model discloses a folding filter core structure, including top, the bottom of top is provided with the mounting slot, the bottom of mounting slot is provided with metal filter drum, the bottom of metal filter drum is along horizontal direction and is up sheet metal and is folded and forms lower fixed ring, be provided with lower fixed cavity in lower fixed ring, the filter area that metal filter drum is established between upper fixed ring and lower fixed ring, the filter hole of metal filter drum thickness direction is passed -in in the filter area. Through rotatable drive ring, make the built -in arc outer support structure produce height direction's displacement, and then transform into horizontal direction and along radial outward expansion movement, because the outside of arc outer support structure and the inside of folding filter screen contact, so folding filter core will open outward, and then in unit space, reduce the filtration area, and then improve the flow rate of fluid flow, make the filter effect of filter core adjustable.

Description

Technical Field

[0001] This utility model relates to filter element structure, and in particular to a folded filter element structure. Background Technology

[0002] Liquid filters are key devices used to remove impurities in pipelines transporting media. They are usually installed at the inlet of valves or equipment to protect downstream equipment. Traditional filter elements have the following problems: filter elements with good filtration effect have low filtration efficiency, while those with high filtration efficiency have poor filtration accuracy. Multi-mesh filter structures have good filtration effect but high cost and cannot be recycled and cleaned.

[0003] In the prior art, Chinese utility model patent application number "202323630403.8" discloses a folded filter cartridge. The folded filter cartridge can improve the filtration effect of the filter. The folded filter cartridge structure increases the filtration area in a limited space, thereby improving the filtration efficiency. However, since the folded filter cartridge structure greatly increases the filtration area in a limited space, it is easy to cause the filtration effect to deteriorate and internal clogging problems when the operating conditions change, such as when the impact force increases. Therefore, a filter cartridge structure that can adjust the filtration effect according to different operating conditions is needed. Utility Model Content

[0004] The primary objective of this invention is to provide a folded filter element structure with the advantage of adjustable filtration efficiency, offering both active and passive adjustment options.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a folded filter element structure, including a top cover, a mounting groove at the bottom of the top cover, a metal filter cartridge at the bottom of the mounting groove, an upper fixing ring formed by a sheet metal folding downwards along the horizontal direction at the top of the metal filter cartridge, a lifting stroke cavity and an upper fixing cavity formed sequentially from the inside to the outside within the upper fixing ring, a lower fixing ring formed by a sheet metal folding upwards along the horizontal direction at the bottom of the metal filter cartridge, a lower fixing cavity provided within the lower fixing ring, a filtration zone provided between the upper and lower fixing rings in the metal filter cartridge, and filter holes penetrating the thickness direction of the metal filter cartridge within the filtration zone, the filter holes being distributed within the filtration zone. A folded filter screen is coaxially sleeved on the outside of the metal filter cartridge. The top of the folded filter screen is embedded in the upper fixed cavity, and the bottom of the folded filter screen is embedded in the lower fixed cavity. The folded filter screen is folded in a wave-like manner in the horizontal direction. A drive ring is rotatably connected in the lifting stroke cavity. The top of the drive ring is provided with a limit structure. An arc-shaped external support structure is provided between the bottom of the drive ring and the lower fixed cavity. A sliding lifting area is provided between the top of the arc-shaped external support structure and the bottom of the drive ring. The bottom of the arc-shaped external support structure is connected to the lower fixed cavity. When the drive ring rotates, the arc-shaped external support structure is compressed or expanded in the height direction, thereby expanding or retracting the folded filter screen outward in the horizontal direction.

[0006] Preferably, the arc-shaped external support structure includes an upper connecting ring, a middle connecting strip, and a lower connecting ring. The upper connecting ring cooperates with the lifting stroke cavity. The top of the middle connecting strip is connected to the bottom of the upper connecting ring, and the bottom of the middle connecting strip is connected to the bottom of the lower connecting ring. The middle connecting strip extends along the height direction of the metal filter cartridge and is evenly distributed along the length direction of the upper connecting ring. Water passage holes are formed between the upper connecting ring, the lower connecting ring, and adjacent middle connecting strips. The upper connecting ring cooperates with the lifting stroke cavity, and the lower connecting ring is located inside the folded filter element and embedded in the lower fixing cavity.

[0007] By adopting the above technical solution, the punching process is facilitated, the lateral expansion force is guaranteed, the weight is ensured, and the water passage hole allows the fluid to pass through, thus avoiding a decrease in fluid flow rate.

[0008] Preferably, the cross-sectional shape of the lifting stroke cavity is annular, the arc-shaped outer support structure is formed by sheet metal stamping, the upper connecting ring rotates horizontally within the lifting stroke cavity, and the upper connecting ring moves up and down in the height direction of the lifting stroke cavity.

[0009] By adopting the above technical solution, the specific connection action between the upper connecting ring and the lifting stroke cavity is disclosed, making the rotation between the two more stable and reliable, while achieving lower sheet metal stamping process costs.

[0010] Preferably, the bottom of the drive ring is provided with at least one drive protrusion, the drive protrusion protruding from the bottom of the drive ring, and the sliding lifting area includes a lifting sliding surface provided on the top of the upper connecting ring. The lifting sliding surface corresponds one-to-one with the drive protrusion, the lifting sliding surface is undulating in the height direction, and the lifting sliding surface abuts against the drive protrusion.

[0011] By adopting the above technical solution, the more driving protrusions there are, the smoother the rotation can be and the more likely it is to get stuck. The driving protrusions cooperate with the lifting and sliding surface at the top of the upper connecting ring to convert the rotational motion into the lifting motion.

[0012] Preferably, the limiting structure includes a driving block disposed on the driving ring, and the limiting structure also includes a driving stroke groove disposed on the upper fixed ring for the driving ring to pass through.

[0013] By adopting the above technical solution, the rotation of the drive ring is controlled by the drive block, the drive stroke groove limits the rotation angle range of the drive ring, and the drive block extends out of the drive stroke groove to provide the action end. Users can use tools or manually turn the drive block to control the opening and closing of the pleated filter element, or control it through the impact of fluid.

[0014] Preferably, the drive block is disposed at the top of the drive ring, the drive stroke groove is disposed through the top of the upper fixed ring, at least two drive blocks are provided, the drive stroke groove corresponds one-to-one with the drive block, and the drive block is fixed by inward sheet metal folding at the top of the upper fixed ring.

[0015] By adopting the above technical solution, the drive block is directly formed by folding the top of the drive ring, which plays a fixing role, reduces the number of parts, makes processing and assembly simpler, and makes operation more intuitive.

[0016] Preferably, the driving block is disposed on the inner circumferential side of the driving ring, the driving stroke groove is disposed through the inner side of the upper fixed ring, the driving block is provided with an impact plate on the inner side of the upper fixed ring, the impact plate is located on the inner side of the upper fixed ring, and the driving stroke groove is disposed along the trajectory of the lifting and sliding surface.

[0017] By adopting the above technical solution, the impact plate can effectively control the rotation of the drive ring in real time when the fluid flow rate changes, thereby improving the opening and closing of the pleated filter element to ensure the fluid flow rate.

[0018] Preferably, the upper fixing ring, the metal filter cylinder, and the lower fixing ring are integrally formed, and the upper fixing ring, the metal filter cylinder, and the lower fixing ring are formed by sheet metal stamping, bending, and welding.

[0019] By adopting the above technical solutions, the structural strength is improved, the sealing and fixing effect is good, and loosening is avoided.

[0020] Preferably, the upper fixing cavity extends downward and the lower fixing cavity extends upward, and the side walls of the upper and lower fixing cavities are provided with locking rings, which abut against the side walls of the folded filter screen.

[0021] By adopting the above technical solution, the snap ring forms a narrow slot. When the end of the folded filter screen is pressed in, it will be elastically deformed and then clamped, providing a strong radial clamping force to ensure that the filter screen will not loosen or fall off under the impact of high-pressure fluid.

[0022] The second objective of this invention is to provide a processing method for a folded filter element structure, which simplifies the processing of the filter element and reduces processing costs by using sheet metal stamping instead of milling.

[0023] In summary, the rotatable drive ring causes the built-in arc-shaped outer support structure to shift in height, which is then converted into a radially outward expansion motion in the horizontal direction. Since the outer side of the arc-shaped outer support structure contacts the inner side of the pleated filter screen, the pleated filter element expands outward, reducing the filtration area per unit space and increasing the fluid flow rate, thus making the filtration effect adjustable. A simple rotation operation changes the tension of the pleats in the pleated filter screen. When tense, the effective filtration channels between the pleats narrow, improving filtration accuracy but potentially reducing flow rate; when relaxed, the channels widen, increasing flow rate but potentially reducing accuracy. The reduced temperature allows the filter element to adapt to the switching between pre-filtration and fine filtration, extending its service life and reducing operating costs. The drive ring and arc-shaped external support structure are fully integrated inside the metal filter cartridge, which consists of an upper fixed ring, a filtration zone, and a lower fixed ring, without occupying external space. The wavy folded filter screen provides a huge effective filtration area. Compared with ordinary filter elements of the same size, it has a larger dirt holding capacity, higher flow rate, and a slower increase in pressure drop. The upper and lower ends of the folded filter screen are embedded in the upper and lower fixed cavities, respectively, preventing the filter screen from falling off or shifting under fluid impact. The metal filter cartridge itself also provides a solid support frame, resulting in lower production costs. Attached Figure Description

[0024] Figure 1 This is a structural schematic diagram of Example 1; Figure 2 This is a schematic diagram of the structure after disassembling the folded filter screen in Example 1; Figure 3 yes Figure 2 An enlarged schematic diagram of part A is shown below; Figure 4 This is an exploded schematic diagram of Example 1; Figure 5 This is a cross-sectional schematic diagram of the retracted state in Example 1; Figure 6 yes Figure 5 An enlarged schematic diagram of part B is shown below; Figure 7 This is a cross-sectional schematic diagram of the unfolded state in Example 1; Figure 8 This is a cross-sectional view of the impact plate location in Embodiment 2; In the diagram, 1. Metal filter cartridge; 11. Upper fixing ring; 12. Drive stroke groove; 13. Lifting stroke cavity; 14. Upper fixing cavity; 15. Engaging ring; 16. Lower fixing ring; 17. Lower fixing cavity; 2. Filtration zone; 21. Filter hole; 3. Folded filter screen; 4. Drive ring; 41. Drive protrusion; 42. Lifting sliding surface; 43. Drive block; 44. Impact plate; 5. Arc-shaped external support structure; 51. Upper connecting ring; 52. Middle connecting strip; 53. Water passage hole; 54. Lower connecting ring. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings.

[0026] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0027] Example 1: like Figures 1 to 7 As shown, a folded filter element structure includes a top cover, which refers to the top cover of the filter inspection port. The bottom of the top cover is provided with a circular mounting groove for the upper fixing ring 11 to be inserted. A metal filter cartridge 1 is provided at the bottom of the mounting groove. The metal filter cartridge 1 is formed by welding sheet metal around a metal plate. The top of the metal filter cartridge 1 is folded downwards in the horizontal direction to form the upper fixing ring 11. The upper fixing ring 11 is formed by bending sheet metal from the inside to the outside to form a lifting stroke cavity 13 and an upper fixing cavity 14. The bottom of the metal filter cartridge 1 is folded upwards in the horizontal direction to form a lower fixing ring 16. The lower fixing ring 16 is provided with a lower fixing cavity 17. A filtration zone 2 is provided between the upper fixing ring 11 and the lower fixing ring 16. After the filtered fluid passes through the lower fixing ring 16, it first passes through the filtration zone 2, then through the arc-shaped outer support structure 5, and finally through the folded filter screen 3. Filter holes 21 penetrate the thickness direction of the metal filter cartridge 1 in the filtration zone 2. The filter holes 21 are distributed in the filtration zone 2.

[0028] The metal filter cartridge 1 serves not only as the primary filtration structure but also as the innermost and strongest supporting frame. The upper connecting ring 51 is folded twice between the lifting stroke cavity 13 and the upper fixed cavity 14, which separates the lifting stroke cavity 13 and the upper fixed cavity 14 horizontally. This prevents the drive ring 4 from affecting the fixation of the outer folded filter element when it rotates inside. Since the metal filter cartridge 1 is formed by punching and bending a stainless steel sheet, the upper fixed ring 11, the metal filter cartridge 1, and the lower fixed ring 16 are formed as a single unit. The upper fixed ring 11, the metal filter cartridge 1, and the lower fixed ring 16 are formed by welding after sheet metal punching and bending.

[0029] To facilitate the fixing of the folded filter 3, drive ring 4, and arc-shaped outer support structure 5, the upper fixing cavity 14 is provided downward through, and the lower fixing cavity 17 is provided upward through. The upper fixing cavity 14 is for the top of the folded filter 3 to be inserted, and the lower fixing cavity 17 is formed by sheet metal for the bottom of the folded filter 3 and the bottom of the arc-shaped outer support structure 5 to be inserted. After insertion, in order to improve the fixing effect of the folded filter 3 and the arc-shaped outer support structure 5, the side walls of the upper fixing cavity 14 and the lower fixing cavity 17 are provided with snap-fit ​​rings 15. The snap-fit ​​rings 15 abut against the side walls of the folded filter 3. After insertion, by applying radial pressure, the upper fixing cavity 14 and the lower fixing cavity 17 deform radially, thereby achieving the fixing effect.

[0030] like Figures 5 to 7 As shown, the metal filter cartridge 1 is provided with an opening frame for opening the pleated filter element. The opening frame is an arc-shaped outer support structure 5. The top of the arc-shaped outer support structure 5 is provided with a drive ring 4 that rotates in the circumferential direction. The drive ring 4 is rotatably connected to the lifting stroke cavity 13 for lifting and rotating. When the drive ring 4 rotates, the arc-shaped outer support structure 5 is compressed or expanded in the height direction, and then expands or retracts the pleated filter screen 3 outward in the horizontal direction. Therefore, a sliding lifting area is provided between the top of the arc-shaped outer support structure 5 and the bottom of the drive ring 4. In order to fix this position and keep the pleated filter element in the open or retracted state, a limit structure is provided on the top of the drive ring 4 to fix this state.

[0031] like Figures 3 to 7As shown, the specific structure of the arc-shaped external support structure 5 is as follows: the arc-shaped external support structure 5 includes an upper connecting ring 51, a middle connecting bar 52, and a lower connecting ring 54. The upper connecting ring 51 cooperates with the lifting stroke cavity 13. The top of the middle connecting bar 52 is connected to the bottom of the upper connecting ring 51, and the bottom of the middle connecting bar 52 is connected to the bottom of the lower connecting ring 54. The middle connecting bar 52 extends along the height direction of the metal filter cartridge 1 and is evenly distributed along the length direction of the upper connecting ring 51. The upper connecting ring 51, the lower connecting ring 54, and the adjacent middle connecting bars... A water passage hole 53 is formed between 52. The water passage hole 53 is formed by sheet metal stamping. The upper connecting ring 51 cooperates with the lifting stroke cavity 13. The lower connecting ring 54 is located inside the folded filter element and is embedded in the lower fixed cavity 17. After bending, the lifting stroke cavity 13 and the upper fixed cavity 14 are formed by welding the ends. The cross-sectional shape of the lifting stroke cavity 13 is annular. The arc-shaped outer support structure 5 is formed by sheet metal stamping. The upper connecting ring 51 rotates horizontally in the lifting stroke cavity 13 and moves up and down in the height direction of the lifting stroke cavity 13.

[0032] like Figures 3 to 7 As shown, in order to make the drive ring 4 rotate, at least one drive protrusion 41 is provided at the bottom of the drive ring 4. In this embodiment, two protrusions are provided. The drive protrusion 41 protrudes from the bottom of the drive ring 4. The sliding lifting area includes a lifting sliding surface 42 provided at the top of the upper connecting ring 51. The lifting sliding surface 42 corresponds one-to-one with the drive protrusion 41. The lifting sliding surface 42 is undulating in the height direction. The lifting sliding surface 42 abuts against the drive protrusion 41, thereby causing the upper connecting ring 51, which is in contact with each other, to move downward during the rotation of the drive ring 4. The driving connecting bar 52 and the folding The filter element structure pushes outward to open the folded filter element; in order to keep the folded filter element in the open state, the limiting structure includes a driving block 43 set on the driving ring 4, and the limiting structure also includes a driving stroke groove 12 set on the upper fixed ring 11 for the driving ring 4 to pass through. The driving block 43 is set on the top of the driving ring 4, and the driving stroke groove 12 is set through the top of the upper fixed ring 11. There are at least two driving blocks 43, and the driving stroke groove 12 corresponds one to one with the driving block 43. The driving block 43 is folded inward at the top of the upper fixed ring 11 and deformed and fixed to the inner wall of the metal filter cartridge 1.

[0033] like Figure 1 and Figure 2 As shown, a folded filter screen 3 is coaxially sleeved on the outside of the metal filter cartridge 1. The folded filter screen 3 is folded in a wave-like manner in the horizontal direction. After being subjected to the outward tension of the middle connecting strip 52, it opens outward. After the middle connecting strip 52 retracts, the folded filter screen 3 retracts inward.

[0034] It also includes a method for processing a pleated filter element structure, comprising the following steps: Step 1: Evenly punch filter holes 21 and drive stroke grooves 12 in the middle section filter zone 2 of the stainless steel plate; Step 2: The upper fixed cavity 14 and the lifting stroke cavity 13 are formed by stamping at the upper end of the stainless steel plate in sequence, and the lower fixed cavity 17 is formed by stamping at the lower end of the stainless steel plate. Step 3: Weld the stainless steel plates end to end in the horizontal direction to form metal filter cylinder 1; Step 4: Punching and welding to form the arc-shaped outer support structure 5 and the drive ring 4 structure; Step 5: Insert the drive ring 4 into the lifting stroke cavity 13, while extending the drive block 43 out of the drive stroke groove 12, and then insert the top of the arc-shaped outer support structure 5 into the lifting stroke cavity 13. Step 6: Place the folded filter 3 on the outside of the arc-shaped outer support structure 5, embed the top of the folded filter 3 into the upper fixing cavity 14, and embed the bottom of the folded filter 3 into the lower fixing cavity 17. Step 7: Apply pressure to the upper and lower ends of the folded filter screen 3 and the bottom of the arc-shaped external support structure 5 in the circumferential direction at the position of the upper fixing ring 11 and the lower fixing ring 16 to fix them.

[0035] Example 2: like Figure 8 As shown, the difference between Example 2 and Example 1 is that Example 1 is an active (manual) control of the opening and retraction of the folded filter screen 3, while Example 2 is an automatic expansion of the folded filter screen 3 structure by the fluid impact of the filter element, and the automatic retraction of the folded filter screen 3 by the elastic restoring force of the material after the impact is reduced.

[0036] like Figure 8 As shown, the drive block 43 is disposed on the inner circumferential side of the drive ring 4, the drive stroke groove 12 is disposed through the inner side of the upper fixed ring 11, the drive block 43 is provided with an impact plate 44 on the inner side of the upper fixed ring 11, the impact plate 44 is located on the inner side of the upper fixed ring 11, and the drive stroke groove 12 is disposed along the trajectory of the lifting sliding surface 42.

Claims

1. A pleated filter element structure, comprising a top cover, characterized in that: The top cover has a mounting groove at its bottom, and a metal filter cylinder (1) is mounted at the bottom of the mounting groove. An upper fixing ring (11) is formed at the top of the metal filter cylinder (1) in a horizontal direction downwards. A lifting stroke cavity (13) and an upper fixing cavity (14) are formed sequentially from the inside to the outside within the upper fixing ring (11). A lower fixing ring (16) is formed at the bottom of the metal filter cylinder (1) in a horizontal direction upwards. A lower fixing cavity (17) is provided within the lower fixing ring (16). A filtration zone (2) is provided between the upper fixing ring (11) and the lower fixing ring (16) of the metal filter cylinder (1). Filter holes (21) penetrate the thickness direction of the metal filter cylinder (1) within the filtration zone (2). The filter holes (21) are distributed within the filtration zone (2). A folded filter screen (3) is coaxially sleeved outside the metal filter cylinder (1). The top of the folded filter (3) is embedded in the upper fixed cavity (14), and the bottom of the folded filter (3) is embedded in the lower fixed cavity (17). The folded filter (3) is folded in a wave-like manner in the horizontal direction. A drive ring (4) is rotatably connected in the lifting stroke cavity (13). The top of the drive ring (4) is provided with a limit structure. An arc-shaped external support structure (5) is provided between the bottom of the drive ring (4) and the lower fixed cavity (17). A sliding lifting area is provided between the top of the arc-shaped external support structure (5) and the bottom of the drive ring (4). The bottom of the arc-shaped external support structure (5) is connected to the lower fixed cavity (17). When the drive ring (4) rotates, the arc-shaped external support structure (5) is compressed or expanded in the height direction, thereby expanding or retracting the folded filter (3) in the horizontal direction.

2. The pleated filter element structure according to claim 1, characterized in that: The arc-shaped external support structure (5) includes an upper connecting ring (51), a middle connecting strip (52), and a lower connecting ring (54). The upper connecting ring (51) cooperates with the lifting stroke cavity (13). The top of the middle connecting strip (52) is connected to the bottom of the upper connecting ring (51), and the bottom of the middle connecting strip (52) is connected to the bottom of the lower connecting ring (54). The middle connecting strip (52) extends along the height direction of the metal filter cartridge (1) and is evenly distributed along the length direction of the upper connecting ring (51). A water passage hole (53) is formed between the upper connecting ring (51), the lower connecting ring (54), and the adjacent middle connecting strip (52). The upper connecting ring (51) cooperates with the lifting stroke cavity (13), and the lower connecting ring (54) is located inside the folded filter element and embedded in the lower fixed cavity (17).

3. The pleated filter element structure according to claim 2, characterized in that: The cross-sectional shape of the lifting stroke cavity (13) is annular, the arc-shaped outer support structure (5) is formed by sheet metal stamping, the upper connecting ring (51) rotates horizontally in the lifting stroke cavity (13), and the upper connecting ring (51) moves up and down in the height direction of the lifting stroke cavity (13).

4. The pleated filter element structure according to claim 2, characterized in that: The bottom of the drive ring (4) is provided with at least one drive protrusion (41), the drive protrusion (41) protrudes from the bottom of the drive ring (4), the sliding lifting area includes a lifting sliding surface (42) provided on the top of the upper connecting ring (51), the lifting sliding surface (42) corresponds one-to-one with the drive protrusion (41), the lifting sliding surface (42) is undulating in the height direction, and the lifting sliding surface (42) abuts against the drive protrusion (41).

5. The pleated filter element structure according to claim 1, characterized in that: The limiting structure includes a driving block (43) disposed on the driving ring (4), and the limiting structure also includes a driving stroke groove (12) disposed on the upper fixed ring (11) for the driving ring (4) to pass through.

6. The pleated filter element structure according to claim 5, characterized in that: The drive block (43) is set on the top of the drive ring (4), the drive stroke groove (12) is set through the top of the upper fixing ring (11), there are at least two drive blocks (43), the drive stroke groove (12) corresponds to the drive block (43) one by one, and the drive block (43) is fixed by inward sheet metal folding on the top of the upper fixing ring (11).

7. The pleated filter element structure according to claim 5, characterized in that: The drive block (43) is disposed on the inner circumferential side of the drive ring (4), the drive stroke groove (12) is disposed through the inner side of the upper fixed ring (11), the drive block (43) is provided with an impact plate (44) on the inner side of the upper fixed ring (11), the impact plate (44) is located on the inner side of the upper fixed ring (11), and the drive stroke groove (12) is disposed along the trajectory of the lifting sliding surface (42).

8. The pleated filter element structure according to claim 1, characterized in that: The upper fixing ring (11), the metal filter cylinder (1) and the lower fixing ring (16) are integrally formed. The upper fixing ring (11), the metal filter cylinder (1) and the lower fixing ring (16) are formed by welding after sheet metal stamping and bending.

9. The pleated filter element structure according to claim 1, characterized in that: The upper fixing cavity (14) is disposed downward and the lower fixing cavity (17) is disposed upward. The side walls of the upper fixing cavity (14) and the lower fixing cavity (17) are provided with locking rings (15), and the locking rings (15) abut against the side walls of the folded filter screen (3).

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