Filter element and manufacture method thereof
First Claim
1. A filter element comprising;
- a multiplicity of tubes each formed of a filtering material of substantially uniform thickness and having a substantially circular shape in cross-section and being arranged side by side into a tubular assembly with longitudinal axes of said tubes lying parallel to one another to form inter-tube openings;
the inter-tube openings being closed at only one end of said tubular assembly which end serves via intra-tube openings as the inlet side for a fluid to be filtered,intra-tube openings on the opposite end of said tubular assembly being closed; and
the total cross-sectional area of all the inter-tube openings being smaller than the total cross-sectional area of all the intra-tube openings, but larger than the minimum cross-sectional area of a path through which the fluid is supplied to said inlet side intra-tube openings.
1 Assignment
0 Petitions
Accused Products
Abstract
A filter element which is improved in filter performance and suitable for use in various types of filters. In the filter element, a multiplicity of tubes each formed of a filtering material and having a substantially circular shape in cross-section are arranged side by side into a tubular assembly with the axes of the tubes lying parallel to one another; inter-tube openings are closed at one end of the tubular assembly which end serves as the inlet side for a fluid to be filtered, whereas intra-tube openings are closed on the opposite end of the tubular assembly; and the total cross-sectional area of all the inter-tube openings, is set smaller than the total cross-sectional area of all the intra-tube openings, but larger than the minimum cross-sectional area of a path through which the fluid is supplied to the tubular assembly. Specifically, one or more filtering materials including a plurality of tubes each having a substantially circular shape in cross-section and connecting portions to interconnect the adjacent tubes are rolled into a spiral shape to provide the tubular assembly with the axes of the tubes arranged side by side parallel to one another.
102 Citations
20 Claims
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1. A filter element comprising;
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a multiplicity of tubes each formed of a filtering material of substantially uniform thickness and having a substantially circular shape in cross-section and being arranged side by side into a tubular assembly with longitudinal axes of said tubes lying parallel to one another to form inter-tube openings; the inter-tube openings being closed at only one end of said tubular assembly which end serves via intra-tube openings as the inlet side for a fluid to be filtered, intra-tube openings on the opposite end of said tubular assembly being closed; and the total cross-sectional area of all the inter-tube openings being smaller than the total cross-sectional area of all the intra-tube openings, but larger than the minimum cross-sectional area of a path through which the fluid is supplied to said inlet side intra-tube openings. - View Dependent Claims (2)
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3. A filter element comprising;
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a plurality of tubes each formed of at least one filtering material of substantially uniform thickness and having a substantially circular shape in cross-section, and connecting portions interconnecting said adjacent tubes, said tubes being disposed in a spiral configuration to provide a tubular assembly with the longitudinal axes of said tubes arranged side by side parallel to one another to form inter-tube openings, the inter-tube openings being closed at one end of said tubular assembly which end serves via intra-tube openings as the inlet side for a fluid to be filtered, intra-tube openings on the opposite end of said tubular assembly being closed. - View Dependent Claims (4, 5, 6, 7, 8, 9)
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10. A filter element for filtering fluid supplied from a supplying path wherein:
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two sheets of corrugated filtering materials each having a substantially uniform thickness and being formed with mountain portions and valley portions, laid one above the other said sheets being superposed with their mountain portions extending in opposite direction and joined at said respective valley portions to each other; said joined sheets being disposed in configuration to form a tubular assembly which includes a multiplicity of fluid passages each having a substantially circular shape in cross-section and arranged side by side with the axes of said fluid passages lying parallel to one another and filtrate passages formed between said fluid passages;
the openings of said filtrate passages being closed at one end face of said tubular assembly,the openings of said fluid passages being closed at the other end face of said tubular assembly; the mountain portions of one of said sheets which lies radically further out in said spiral configuration than the other sheet having a larger circumferential length than the mountain portions of said other sheet; a total cross-sectional area of all of said filtrate passages being smaller than a total cross-sectional area of all of said fluid passages. - View Dependent Claims (11, 12, 13, 14)
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15. A filter element for filtering fluid supplied from a supplying path, comprising:
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a multiplicity of tubes of a filtering material having a substantially uniform thickness, said tubes having a substantially circular cross-sectional shape, said tubes being arranged side by side to be a tubular assembly having an axis substantially parallel to an axis of said tube, so that a plurality of spaces are formed within said tubular assembly between said tubes, one end of said tubes being open to said supplying path and another end of said tubes being closed so that fluid passages to which the fluid from the supplying path is introduced is formed within said tubes, an end of said spaces which corresponds to said one end of said tubes being closed and another end of said spaces being open to form filtrate passages to which the fluid from said fluid passage flows through said filtering material in such a manner that the fluid penetrates through a whole surface of said tubes; a total cross-sectional area of all of said filtrate passages being smaller than a total cross-sectional area of all of said fluid passages. - View Dependent Claims (16)
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17. A filter element comprising:
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a multiplicity of tubes each formed of a filtering material of substantially uniform thickness and being arranged side by side into a tubular assembly with longitudinal axes of said tubes lying parallel to one another to form inter-tube openings; the inter-tube openings being closed at only one end of said tubular assembly which end serves via intra-tube openings as the inlet side for a fluid to be filtered, intra-tube openings on the opposite end of said tubular assembly being closed; and the total cross-sectional area of all the inter-tube openings being smaller than the total cross-sectional area of all the intra-tube openings, but larger than the minimum cross-sectional area of a path through which the fluid is supplied to said inlet side intra-tube openings.
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18. A filter element comprising:
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a plurality of tubes each formed of at least one filtering material of substantially uniform thickness, and connecting portions interconnecting said adjacent tubes, said tubes being disposed in a spiral configuration to provide a tubular assembly with the longitudinal axes of said tubes arranged side by side parallel to one another to form inter-tube openings, the inter-tube openings being closed at one end of said tubular assembly which end serves via intra-tube openings as the inlet side for a fluid to be filtered, intra-tube openings on the opposite end of said tubular assembly being closed.
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19. A filter element for filtering fluid supplied from a supplying path wherein:
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two sheets of corrugated filtering materials each having a substantially uniform thickness and being formed with mountain portions and valley portions, laid one above the other said sheets being superposed with their mountain portions extending in opposite direction and joined at said respective valley portions to each other; said joined sheets being disposed in a spiral configuration to form a tubular assembly which includes a multiplicity of fluid passages each having a substantially circular shape in cross-section and arranged side by side with the axes of said fluid passages lying parallel to one another and filtrate passages formed between said fluid passages;
the openings of said filtrate passages being closed at one end face of said tubular assembly,the openings of said fluid passages being closed at the other end face of said tubular assembly; the mountain portions of one of said sheets which lies radically further out in said spiral configuration than the other sheet having a larger circumferential length than the mountain portions of said other sheet; a total cross-sectional area of all of said filtrate passages being smaller than a total cross-sectional area of all of said fluid passages.
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20. A filter element for filtering fluid supplied from a supplying path, comprising:
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a multiplicity of tubes of a filtering material having a substantially uniform thickness, said tubes being arranged side by side to be a tubular assembly having an axis substantially parallel to an axis of said tube, so that a plurality of spaces are formed within said tubular assembly between said tubes, one end of said tubes being open to said supplying path and another end of said tubes being closed so that fluid passages to which the fluid from the supplying path is introduced is formed within said tubes, an end of said spaces which corresponds to said one end of said tubes being closed and another end of said spaces being open to form filtrate passages to which the fluid from said fluid passage flows through said filtering material in such a manner that the fluid penetrates through a whole surface of said tubes; a total cross-sectional area of all of said filtrate passages being smaller than a total cross-sectional area of all of said fluid passages.
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Specification