CN110538498A - Folding filter element - Google Patents
Folding filter element Download PDFInfo
- Publication number
- CN110538498A CN110538498A CN201910883891.2A CN201910883891A CN110538498A CN 110538498 A CN110538498 A CN 110538498A CN 201910883891 A CN201910883891 A CN 201910883891A CN 110538498 A CN110538498 A CN 110538498A
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- Prior art keywords
- pleat
- shell
- valley
- filter element
- valleys
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- 239000012528 membrane Substances 0.000 claims abstract description 50
- 239000011148 porous material Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 2
- 239000011800 void material Substances 0.000 claims 3
- 239000012530 fluid Substances 0.000 abstract description 55
- 230000002028 premature Effects 0.000 abstract description 8
- 239000000706 filtrate Substances 0.000 abstract description 6
- 239000002689 soil Substances 0.000 abstract 1
- 238000001914 filtration Methods 0.000 description 22
- 238000009434 installation Methods 0.000 description 10
- 239000003344 environmental pollutant Substances 0.000 description 7
- 231100000719 pollutant Toxicity 0.000 description 7
- 239000002245 particle Substances 0.000 description 3
- 230000001788 irregular Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/13—Supported filter elements
- B01D29/15—Supported filter elements arranged for inward flow filtration
- B01D29/21—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets
- B01D29/213—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets having a concertina shape
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to a pleated filter element comprising a central core, a shell and a pleated filter membrane therebetween, each pleat having a pleat valley near the side of the central core, a pleat peak near the side of the shell and a first leg and a second leg extending from the pleat valley to the pleat peak, the pleat valley spaced from the central core being a first pleat valley, the pleat valley in contact with the central core being a second pleat valley, the pleat peak spaced from the shell being a first pleat peak, and the pleat peak in contact with the shell being a second pleat peak. The existence of first pleat valley and first pleat peak has increased the soil holding capacity of filter core, can solve the problem of current filter core premature jam. The height of the first leg and the second leg of each pleat is at least 50% of the distance between the center rod and the shell, so that the mounting operation of the pleats is simpler, the pleats are not easy to deform, and the structural stability is good. And the first voids formed in the inner sides of the legs adjacent the second valleys and the second voids formed in the inner sides of the legs adjacent the second crests reduce the flow differential between the feed fluid and the clean filtrate, improving the flow characteristics of the fluid through the filter element.
Description
Technical Field
The invention relates to the technical field of filtration, in particular to a folding filter element.
Background
In a prior art pleated filter element such as that shown in fig. 1, all of the pleats are of equal pleat height, the pleat faces are closely spaced together throughout the height of the pleats, and all of the crests and valleys contact the center core and the shell of the filter element, respectively. Since all of the pleat heights are equal and the pleat surfaces are tightly packed together over the entire height, only a relatively small area of the pleat surfaces near the pleat peaks and valleys is exposed. In the filter element, if the fluid flows from the outer side to the inner side of the filter element in the filtering process, particles in the fluid are continuously accumulated on the surfaces of the folds exposed near the fold peaks, and the problem of early blockage of the filter membrane near the fold peak ends is easily caused. If the direction of fluid flow is reversed, it tends to cause premature clogging of the filter membrane near the ends of the valleys and also causes a low filtration rate due to the surfaces of the pleats being pressed together tightly throughout their height, including the valleys and crests, and also causes a greater resistance to fluid flow.
In order to solve the above problems, japanese patent No. JP4634890B2 provides a pleated filter element having pleats that do not contact an inner core or outer shell, so that feed fluid can contact a larger area of the filter membrane and provide a larger effective filter membrane area. As shown in the drawings of the japanese patent, the pleats of the pleated filter element are in the form of a shell side pleat unit comprising at least two crests contacting the shell and at least one valley between the two crests, the valley not contacting the core; and an inner core side pleat unit comprising at least two pleat valleys contacting the inner core and at least one pleat peak located between the two pleat valleys, the pleat peaks not contacting the outer shell, and the height of the pleat peaks of the inner core side pleat unit being higher than the height of the pleat valleys of the outer shell side pleat unit, such that the pleat peaks of the inner core side pleat unit and the pleat valleys of the outer shell side pleat unit form partial overlaps. After the folding filter element is arranged between the inner core and the outer shell, the inner core is arranged on the side of the inner core, the pleat valleys are in close contact, the outer shell is arranged on the side of the outer shell, and a large unfilled space is reserved between every two adjacent pleat peaks, so that the purpose of exposing a larger area of the filter membrane and increasing the membrane area of the outer shell side for intercepting particle pollutants in the feeding fluid is achieved, and the problem of premature blockage of the filter membrane at the end of the pleat peaks is solved.
however, since the housing side of the filter element has a large space which is not filled with the filter membrane, i.e. the space on the housing side is not fully utilized, the folded filter element can actually provide a smaller filter membrane area. In addition, in order to improve the mechanical strength of the whole folded filter element, the crest of the inner core side pleat unit which is not contacted with the outer shell and the trough of the outer shell side pleat unit which is not contacted with the inner core are partially overlapped, when the folded filter membrane is installed between the inner core and the outer shell, the crest of the inner core side pleat unit which is not contacted with the outer shell and the trough of the outer shell side pleat unit which is not contacted with the inner core are just partially overlapped and the pleat structure is not stable, namely, the filter membrane installation operation of the folded filter element is inconvenient, and the trough of the outer shell side pleat unit which is not contacted with the inner core is short, when the folded filter element is installed, the two adjacent crest of the inner core side pleat units which are not contacted with the outer shell are extruded outwards easily, and the deformation is generated, namely, the structure stability of the outer shell side pleat unit.
Therefore, there is a need to improve the structure of pleated filter elements, solve the problem of premature clogging of the existing pleated filter elements, reduce the flow resistance to the fluid, increase the filtration rate, simplify the installation of the pleats, and ensure that the pleats have good structural stability after the pleats are installed.
Disclosure of Invention
The invention aims to provide a folding filter element, which aims to solve the problem of early blockage of the existing folding filter element, reduce the flow resistance of fluid, increase the filtering speed, simplify the installation operation of pleats and ensure that the structural stability of the pleats is good after the pleats are installed.
In order to achieve the purpose, the invention adopts the following technical scheme:
A pleated filter element comprising a central core, a shell, and a filter membrane therebetween, the central core and the shell having liquid permeable pores, the filter membrane being pleated to form pleats, each of the pleats having a valley adjacent a side of the central core, a crest adjacent a side of the shell, and two legs extending from the valley to the crest, the valleys and the crests being spaced apart at a fixed frequency from the central core and the shell, respectively, the valley spaced apart from the central core being a first valley, the valley in contact with the central core being a second valley, the crest spaced apart from the shell being a first peak, the crest in contact with the shell being a second peak, the first valley being spaced from the central core by 5% to 50% of the spacing between the central core and the shell, the first peak being spaced from the shell by 5% to 50% of the spacing between the central core and the shell, the inner sides of the legs adjacent the second valleys define first voids and the inner sides of the legs adjacent the second crests define second voids, the first and second voids extending throughout the axial height of the filter element.
in the conventional pleated filter element, since all the pleats are equal in height and the pleat surfaces are closely adhered together in the whole height range, only the pleat surfaces close to the relatively small areas of the pleat peaks and the pleat valleys are exposed, the filter membranes at the pleat peak ends and the pleat valley ends on the shell side and the inner core side are easily blocked prematurely, and the effective areas of the filter membranes actually used for filtering are too small.
According to the folding filter element provided by the invention, the first valley separated from the central rod is arranged on the side of the central rod, and the first peak separated from the shell is arranged on the side of the shell, so that filter membranes with larger areas are exposed on two sides and used for intercepting particulate pollutants, the pollutant carrying capacity of the filter membranes on the side of the central rod and the side of the shell is increased, and the problem of premature blockage of the traditional folding filter element can be solved.
Although the pleated filter element provided in JP4634890B2 can solve the problem of premature clogging of the filter membrane, it is not easy to provide a filter membrane in which the filter membrane is mounted while ensuring that the crests of the inner core side pleat elements, which are not in contact with the outer shell, and the troughs of the outer shell side pleat elements, which are not in contact with the inner core, are exactly partially overlapped and that the structure is stable, i.e., the filter membrane mounting operation of the pleated filter element is inconvenient; and the pleat valleys of the shell side pleat unit, which are not contacted with the inner core, are shorter, so that the pleat valleys of the two adjacent inner core side pleat units, which are not contacted with the shell, are easily extruded outwards during installation, and deformation occurs, namely, the structural stability of the short pleats on the shell side is not good.
According to the folding filter element provided by the invention, the distance between the first pleat valleys and the central rod is 5% -50% of the distance between the central rod and the shell, the distance between the first pleat peaks and the shell is 5% -50% of the distance between the central rod and the shell, namely the heights of two legs of pleats where all the first pleat valleys and the first pleat peaks are located are at least 50% of the distance between the central rod and the shell, so that the problem that the pleats are easy to deform due to over short pleats can be avoided, the installation operation is simpler, and the structural stability of the pleats is good after the installation is finished.
In addition, with the prior pleated filter element, since all pleats are of equal height, the pleat surfaces are tightly packed throughout the height, including all adjacent pleat valleys and all adjacent pleat peaks, causing greater flow resistance to the flow of feed fluid and clean filtrate, resulting in a filter element with a low filtration rate.
According to the folding filter element provided by the invention, because the fold valleys and the fold peaks are respectively spaced from the center rod and the shell at a fixed frequency, the second fold valleys adjacent to the first fold valleys are not pressed by the first fold valleys, and the second fold peaks adjacent to the first fold peaks are not pressed by the first fold peaks, so that the pressing acting force applied to all the second fold valleys and the second fold peaks is greatly reduced, so that the first gaps are formed on the inner sides of the legs near the second fold valleys, and the second gaps are formed on the inner sides of the legs near the second fold peaks. And the first gap and the second gap extend in the whole height range of the folded filter element to form a fluid flow channel extending in the whole height range of the filter element, so that fluid can rapidly pass through the filter membranes on the central rod side and the shell side, and the filtering rate of the filter element is accelerated.
Further, a third gap is formed between the first corrugation valley and the center rod, a fourth gap is formed between the first corrugation peak and the outer shell, the third gap separates the second corrugation valleys on two sides of the third gap, and the fourth gap separates the second corrugation peaks on two sides of the fourth gap.
The first pleat valley and the central rod form a third gap, the first pleat peak and the shell form a fourth gap, the third gap separates the second pleat valleys on two sides of the third gap, and the fourth gap separates the second pleat peaks on two sides of the fourth gap, which ensures that the first pleat valley is communicated with the fluid between the central rod and the fluid between the first pleat peak and the shell, avoids causing additional resistance to the fluid flow and improves the filtration rate.
Further, the narrowest point of the third gap is at least 1/10 of the thickness of the two legs corresponding to the first pleat valley, and the narrowest point of the fourth gap is at least 1/10 of the thickness of the two legs corresponding to the first pleat peak.
since the second valley adjacent to the first valley is not pressed by the first valley and the second peak adjacent to the first peak is not pressed by the first peak, so that the pressing force applied to all the second valleys and the second peaks is greatly reduced, the second valleys and the second peaks bulge out into the spaces of the third gap and the fourth gap, respectively, the first gap is formed on the inner side of the leg near the second valley, the second gap is formed on the inner side of the leg near the second peak, the third gap and the fourth gap are irregular in shape, and the gaps in some areas are smaller. However, the pleated filter element of the present invention ensures that the narrowest point of the third gap is at least 1/10 mm thick of the two legs corresponding to the first valley, and the narrowest point of the fourth gap is at least 1/10 mm thick of the two legs corresponding to the first peak, which ensures that a gap of a certain width is always left between the two second valleys separated by the third gap and between the two second peaks separated by the fourth gap, so that the fluid passage between the first valley and the central rod is not blocked, and the fluid passage between the first peak and the shell is not blocked, i.e., the fluid communication between the first valley and the central rod and the fluid communication between the first peak and the shell are ensured, so as to facilitate the rapid passage of fluid and increase the filtration rate.
Further, the radial length of the first gap is more than 70% of the distance between the first pleat valley and the central rod, and the radial length of the second gap is more than 70% of the distance between the first pleat peak and the shell.
The radial length of the first and second gaps is more than 70% of the distance between the first corrugation valley and the central rod and the distance between the first corrugation peak and the shell respectively, so that the flow pressure difference of the feed fluid and the clean filtrate when the feed fluid and the clean filtrate penetrate through the second corrugation valley and the second corrugation peak can be greatly reduced, the flow resistance is reduced, and the flow characteristics of the fluid when the fluid passes through the filter element are obviously improved.
Further, the radial length of the third gap is larger than that of the fourth gap.
Because the space on the side of the central rod is small, the fluid flow is easy to cause larger resistance, the space on the side of the shell is large, and the distance between the pleat peak and the shell has larger influence on the filtering area of the filter membrane.
Further, the third gap and the fourth gap extend over the entire axial height of the filter element.
the third and fourth voids extend the full axial height of the filter element to provide fluid flow passages between the first valley and the center rod and between the first peak and the shell, respectively, which fluid flow passages are formed to reduce fluid flow resistance and facilitate rapid fluid flow therethrough.
Further, the two legs extend from the valley to the peak with a curvature.
Further, in a cross-section perpendicular to the axial direction of the pleated filter element, a tangent to the pleat valleys does not pass through the center of the center rod.
In a cross-section perpendicular to the axial direction of the pleated filter element, the tangent to the pleat valleys does not pass through the center of the central rod, i.e. both legs of all pleats are curved with a constant curvature and in the same direction in the space between the central rod and the housing, so that the contact-supporting effect between adjacent legs is homogenized and the space between adjacent legs is also homogenized. During filtering, fluid can quickly enter the space between the adjacent legs and is uniformly distributed on the surface of the filter membrane, so that the effective filtering area of the filter membrane is increased, and the filtering speed is accelerated.
Further, on the side of the central rod, every two second valleys are followed by a first valley, and on the side of the shell, every two second peaks are followed by a first peak.
Further, on the side of the central rod, two first corrugation valleys follow every second corrugation valley, and on the side of the shell, two first corrugation peaks follow every second corrugation peak.
According to the folding filter element provided by the invention, the first valley separated from the central rod is arranged on the side of the central rod, and the first peak separated from the shell is arranged on the side of the shell, so that filter membranes with larger areas are exposed on two sides and used for intercepting particulate pollutants, the pollutant carrying capacity of the filter membranes on the side of the central rod and the side of the shell is increased, and the problem of premature blockage of the existing folding filter element can be solved; the distance between the first pleat valleys and the central rod is 5% -50% of the distance between the central rod and the shell, the distance between the first pleat peaks and the shell is 5% -50% of the distance between the central rod and the shell, namely the heights of two legs of the pleats where the first pleat valleys and the first pleat peaks are at least 50% of the distance between the central rod and the shell, so that the problem that the pleats are too short and are easy to deform can be avoided, the installation operation is simpler, and after the installation is finished, the structural stability of the pleats is good. And because the second fold valley adjacent to the first fold valley is not pressed by the first fold valley, and the second fold peak adjacent to the first fold peak is not pressed by the first fold peak, the pressing force applied to all the second fold valleys and the second fold peaks is greatly reduced, so that a first gap is formed on the inner side of the leg near the second fold valley, and a second gap is formed on the inner side of the leg near the second fold peak, and the first gap and the second gap can reduce the flow pressure difference between the feeding fluid and the clean filtrate, reduce the flow resistance of the fluid, and further improve the flow characteristics of the fluid when the fluid passes through the filter element.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
FIG. 1 is a side view of a prior art pleated filter cartridge;
Fig. 2 is a top view of a first pleated filter element according to the present invention;
fig. 3 is a top view of a second pleated filter element provided in accordance with the present invention;
FIGS. 4a and 4b are partial enlargements of FIG. 3;
Wherein, 1-center pole, 2-shell, 3-pleat, 31S-first pleat valley, 31L-second pleat valley, 310-first gap, 32S-first pleat peak, 32L-second pleat peak, 320-second gap, 311-third gap, 321-fourth gap.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
The structure of the pleated filter element provided by the present invention will be described below by referring to two examples.
The first form of the pleated filter element shown in fig. 2 comprises a center rod 1, a housing 2 and a filter membrane located therebetween, wherein the upstream side of the filter membrane is provided with a spacer layer, and the downstream side of the filter membrane is provided with a drainage layer, so that the surfaces of the filter membrane are prevented from being directly and tightly attached together, a certain space is reserved between the surfaces of the filter membrane, fluid flow is facilitated, and flow resistance is reduced. The central rod 1 and the outer shell 2 have liquid-permeable pores, the filter membrane is folded to form pleats 3, each pleat 3 has a pleat valley near the side of the central rod 1, a pleat peak near the side of the outer shell 2 and two legs extending from the pleat valley to the pleat peak with a certain curvature. The pleat valleys and the pleat peaks are spaced apart from the center rod 1 and the shell 2 at a fixed frequency, respectively, the pleat valleys spaced apart from the center rod 1 being first pleat valleys 31S, the pleat valleys in contact with the center rod 1 being second pleat valleys 31L, the pleat peaks spaced apart from the shell 2 being first pleat peaks 32S, and the pleat peaks in contact with the shell 2 being second pleat peaks 32L.
On the side of the center rod 1, every two second corrugation valleys 31L are followed by a first corrugation valley 31S, on the side of the outer shell 2, every two second corrugation peaks 32L are followed by a first corrugation peak 32S, the distance between the first corrugation valley 31S and the center rod 1 is 5% -50% of the distance between the center rod 1 and the outer shell 2, and the distance between the first corrugation peak 32S and the outer shell 2 is 5% -50% of the distance between the center rod 1 and the outer shell 2. The second valley 31L adjacent to the first valley 31S is not pressed by the first valley 31S, and the second peak 32L adjacent to the first peak 32S is not pressed by the first peak 32S.
A second type of folded filter element, as shown in fig. 3, comprises a central rod 1, a housing 2 and a filter membrane located therebetween, wherein the upstream side of the filter membrane is provided with a spacer layer, and the downstream side of the filter membrane is provided with a drainage layer, so as to avoid the surfaces of the filter membrane from being directly and tightly attached together, so that a certain space is reserved between the surfaces of the filter membrane, thereby facilitating the fluid flow and reducing the flow resistance. The central rod 1 and the outer shell 2 have liquid-permeable pores, the filter membrane is folded to form pleats 3, each pleat 3 has a pleat valley near the side of the central rod 1, a pleat peak near the side of the outer shell 2 and two legs extending from the pleat valley to the pleat peak with a certain curvature. The pleat valleys and the pleat peaks are spaced apart from the center rod 1 and the shell 2 at a fixed frequency, respectively, the pleat valleys spaced apart from the center rod 1 being first pleat valleys 31S, the pleat valleys in contact with the center rod 1 being second pleat valleys 31L, the pleat peaks spaced apart from the shell 2 being first pleat peaks 32S, and the pleat peaks in contact with the shell 2 being second pleat peaks 32L.
On the side of the center bar 1, two first pleat valleys 31S are continued behind every two second pleat valleys 31L, and on the side of the outer shell 2, two first pleat peaks 32S are continued behind every two second pleat peaks 32L, the distance between the first pleat valleys 31S and the center bar 1 is 5% -50% of the distance between the center bar 1 and the outer shell 2, and the distance between the first pleat peaks 32S and the outer shell 2 is 5% -50% of the distance between the center bar 1 and the outer shell 2. Therefore, the filter membranes with larger areas are exposed at the two sides of the central rod 1 and the shell 2 and used for intercepting particle pollutants, the pollutant carrying capacity of the filter membranes at the side of the central rod 1 and the side of the shell 2 is increased, and the problem of premature blockage of the existing folding filter element can be solved.
And the distance between the first pleat valley 31S and the central rod 1 is 5-50% of the distance between the central rod 1 and the shell 2, and the distance between the first pleat peak 32S and the shell 2 is 5-50% of the distance between the central rod 1 and the shell 2, namely, the heights of two legs of the pleat where all the first pleat valleys 31S and the first pleat peaks 32S are at least 50% of the distance between the central rod 1 and the shell 2, so that the problem that the pleats are too short and easy to deform can be avoided, the installation operation is simpler, and the structural stability of the pleats is good after the installation is finished.
Fig. 4a and 4b are partially enlarged views of fig. 3, and as shown in fig. 4a and 4b, the second valley 31L adjacent to the first valley 31S is not pressed by the first valley 31S, the second peak 32L adjacent to the first peak 32S is not pressed by the first peak 32S, the first space 310 is formed at the inner side of the leg near the second valley 31L, and the second space 320 is formed at the inner side of the leg near the second peak 32L. The radial length of the first gap 310 is 70% or more of the distance between the first corrugation valley 31S and the center rod 1, and the radial length of the second gap 320 is 70% or more of the distance between the first corrugation peak 32S and the housing 2, which can greatly reduce the flow pressure difference between the feed fluid and the clean filtrate when passing through the corrugation valleys and the corrugation peaks, reduce the flow resistance, and significantly improve the flow characteristics when the fluid passes through the filter element. Furthermore, the first and second gaps 310 and 320 extend over the entire axial height of the folded filter element, forming fluid flow channels extending over the entire axial height of the filter element, so that fluid can rapidly pass through the filter membranes on the center rod 1 side and the housing 2 side, and the filtration rate of the filter element is increased.
Furthermore, a third gap 311 is formed between the first corrugation valley 31S and the center rod 1, a fourth gap 321 is formed between the first corrugation peak 32S and the housing 2, the third gap 311 separates the second corrugation valley 31L on both sides thereof, and the fourth gap 321 separates the second corrugation peak 32L on both sides thereof, which ensures the fluid communication between the first corrugation valley 31S and the center rod 1 and between the first corrugation peak 32S and the housing 2, thereby avoiding additional resistance to the fluid flow and improving the filtration rate.
Preferably, the narrowest point of the third gap 311 is at least 1/10 of the thickness of the two legs corresponding to the first valley 31S, and the narrowest point of the fourth gap 321 is at least 1/10 of the thickness of the two legs corresponding to the first peak 32S. Since the second valley 31L adjacent to the first valley 31S is not pressed by the first valley 31S and the second peak 32L adjacent to the first peak 32S is not pressed by the first peak 32S, so that all the second valleys 31L and the second peaks 32L are greatly reduced in the pressing force, the second valley 31L and the second peak 32L bulge into the spaces of the third gap 311 and the fourth gap 321, respectively, the first gap 310 is formed inside the leg near the second valley 31L, the second gap 320 is formed inside the leg near the second peak 32L, and the third gap 311 and the fourth gap 321 are irregular in shape and have a smaller gap in some regions. In the pleated filter element provided by the present invention, the narrowest point of the third gap 311 is at least 1/10 of the thickness of the two legs corresponding to the first valley 31S, and the narrowest point of the fourth gap 321 is at least 1/10 of the thickness of the two legs corresponding to the first crest 32S, which ensures that a gap with a certain width is always left between the two second valleys 31L spaced by the third gap 311 and between the two second crests 32L spaced by the fourth gap 321, so that the fluid passage between the first valley 31S and the central rod 1 is not interrupted, and the fluid passage between the first crest 32S and the shell 2 is not interrupted, i.e. the fluid communication between the first valley 31S and the central rod 1 and the fluid communication between the first crest 32S and the shell 2 are ensured, so as to facilitate the rapid passage of fluid and accelerate the filtration rate.
in addition, the radial length of the third gap 311 is greater than the radial length of the fourth gap 321. Since the space on the side of the center rod 1 is small and is easy to cause larger resistance to the flow of fluid, while the space on the side of the shell 2 is large, and the distance between the pleat peaks and the shell 2 has a larger influence on the filtering area of the filter membrane, in the folded filter element provided by the invention, the radial length of the third gap 311 is larger than that of the fourth gap 321, i.e. the distance between the first pleat valley 31S on the side of the center rod 1 and the center rod 1 is larger than that between the first pleat peak 32S on the side of the shell 2 and the shell 2, so that the flow resistance of the fluid passing through the filter membrane near the center rod 1 is reduced, and a sufficiently large filtering area of the filter membrane is. Further, the third and fourth gaps 311 and 321 extend over the entire axial height of the filter element, so that fluid flow passages are formed between the first valley 31S and the center rod 1 and between the first peak 32S and the housing 2, respectively, and the fluid flow passages are formed to reduce the flow resistance of the fluid and facilitate the rapid passage of the fluid.
In a cross-section perpendicular to the axial direction of the pleated filter element, the tangent to the first and second pleat valleys 31S and 31L does not pass through the center of the center rod 1, i.e., both legs of all the pleats are curved with a constant curvature and in the same direction in the space between the center rod 1 and the shell 2, e.g., both legs are curved in the clockwise direction or both in the counterclockwise direction, so that the contact supporting effect between the adjacent legs is uniformalized and the gap between the adjacent legs is made uniform. During filtering, fluid can quickly enter the space between the adjacent legs and is uniformly distributed on the surface of the filter membrane, so that the effective filtering area of the filter membrane is increased, and the filtering speed is accelerated.
While the preferred embodiments of the present invention have been illustrated and described in detail, it should be understood that various changes and modifications of the invention can be effected therein by those skilled in the art after reading the above teachings of the invention. Such equivalents are intended to fall within the scope of the claims appended hereto.
Claims (10)
1. A pleated filter element comprising a central core, a shell, and a filter membrane therebetween, the central core and the shell having liquid permeable pores, the filter membrane being pleated to form pleats, each of the pleats having a valley adjacent a side of the central core, a crest adjacent a side of the shell, and two legs extending from the valley to the crest, the valleys and the crests being spaced apart at a fixed frequency from the central core and the shell, respectively, the valleys spaced apart from the central core being a first valley, the valleys in contact with the central core being a second valley, the crests spaced apart from the shell being first crests, the crests in contact with the shell being second crests, the crests being characterized in that: the distance between the first pleat valley and the central rod is 5-50% of the distance between the central rod and the shell, the distance between the first pleat peak and the shell is 5-50% of the distance between the central rod and the shell, the inner side of the leg near the second pleat valley forms a first gap, the inner side of the leg near the second pleat peak forms a second gap, and the first gap and the second gap extend in the whole axial height range of the filter element.
2. A pleated filter element according to claim 1 wherein the first valleys define a third void with the center rod, the first crests define fourth voids with the shell, the third voids space the second valleys on opposite sides of the third voids, and the fourth voids space the second crests on opposite sides of the fourth voids.
3. A pleated filter element according to claim 2 wherein the narrowest point of the third void is at least 1/10 the thickness of the legs corresponding to the first pleat valley and the narrowest point of the fourth void is at least 1/10 the thickness of the legs corresponding to the first pleat peak.
4. A folding filter element according to claim 2 or 3 wherein said first interstices have a radial length which is greater than 70% of the distance between the first pleat valleys and the center post, and said second interstices have a radial length which is greater than 70% of the distance between the first pleat peaks and the shell.
5. A folding filter element according to claim 3 wherein said third gap has a radial extent greater than a radial extent of said fourth gap.
6. A folding filter element according to claim 5 wherein said third and fourth interstices extend over the entire axial height of the filter element.
7. A pleated filter element according to claim 1 or 2, wherein the two legs extend from the valley to the crest with a curvature.
8. A pleated filter element according to claim 7, wherein, in a cross-section perpendicular to the axial direction of the pleated filter element, tangents to the first and second valleys do not pass through the center of the center rod.
9. A pleated filter element according to claim 8 wherein each two of said second valleys are followed by a first valley on the center rod side and each two of said second peaks are followed by a first peak on the shell side.
10. A pleated filter element according to claim 8 wherein two first pleat valleys follow two second pleat valleys and two first pleat peaks follow two second pleat peaks on the shell side.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910883891.2A CN110538498A (en) | 2019-09-19 | 2019-09-19 | Folding filter element |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910883891.2A CN110538498A (en) | 2019-09-19 | 2019-09-19 | Folding filter element |
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| CN110538498A true CN110538498A (en) | 2019-12-06 |
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| CN201910883891.2A Pending CN110538498A (en) | 2019-09-19 | 2019-09-19 | Folding filter element |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112076517A (en) * | 2020-09-15 | 2020-12-15 | 陈萍 | Filter equipment for lathe cutting fluid |
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| EP0983954A1 (en) * | 1992-11-06 | 2000-03-08 | Pall Corporation | Pleating apparatus and methods |
| US20020060183A1 (en) * | 2000-09-15 | 2002-05-23 | Paul C. Thomas | Spiral pleated filter cartridges |
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Application publication date: 20191206 |
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