Filter element with zig-zag pleats
First Claim
1. A filter element including a generally ring-like structure including a plurality of generally radial sections each converging generally radially inwardly and having a plurality of generally circumferential zigzag pleats of a filtering sheet material, said radial sections being circumferentially arranged such that the radially inner ends of said radial sections cooperate to define a central space disposed substantially centrally of said ring-like structure and generally radial spaces are defined between said radial sections, the zigzag pleats of each radial section having circumferential dimensions which are substantially gradually decreased radially inwardly of said ring-like structure, some of said radial spaces being radially inwardly open to said central space and being closed at the radially outer ends by said filtering sheet material, the other radial spaces being closed at the radially inner ends by said filtering sheet material, said radially inwardly open radial spaces and the other radial spaces being circumferentially alternately arranged, and said radially inwardly open radial spaces being closed at the axially opposite ends by end walls.
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Accused Products
Abstract
A filter element has a generally ring-like structure which basically comprises a plurality of generally radial sections circumferentially arranged to define a central space. Each radial section has a plurality of circumferentially zigzag pleats formed from a ribbon of a filtering sheet material. The radial sections are circumferentially connected such that radially inwardly open generally radial spaces and radially outwardly open generally radial spaces are defined. The radially inwardly open radial spaces are closed at the axially opposite ends by end walls. Fluid to be filtrated can enter the radially outwardly open radial spaces and then passes through the zigzag pleats into the radially inwardly open radial spaces and thus into the central space. The ring-like structure has many modifications.
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Citations
19 Claims
- 1. A filter element including a generally ring-like structure including a plurality of generally radial sections each converging generally radially inwardly and having a plurality of generally circumferential zigzag pleats of a filtering sheet material, said radial sections being circumferentially arranged such that the radially inner ends of said radial sections cooperate to define a central space disposed substantially centrally of said ring-like structure and generally radial spaces are defined between said radial sections, the zigzag pleats of each radial section having circumferential dimensions which are substantially gradually decreased radially inwardly of said ring-like structure, some of said radial spaces being radially inwardly open to said central space and being closed at the radially outer ends by said filtering sheet material, the other radial spaces being closed at the radially inner ends by said filtering sheet material, said radially inwardly open radial spaces and the other radial spaces being circumferentially alternately arranged, and said radially inwardly open radial spaces being closed at the axially opposite ends by end walls.
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11. A filter element including a generally ring-like structure including a plurality of generally radial sections each having a plurality of generally circumferential zigzag pleats of a filtering sheet material, each of at least some said radial sections converging generally radially inwardly, all of said radial sections being circumferentially arranged such that the radially inner ends of said radial sections cooperate to define a central space disposed substantially centrally of said ring-like structure and generally radial spaces are defined between said radial sections, some of said radial spaces being radially inwardly open to said central space and being closed at the radially outer ends by said filtering sheet material, the other radial spaces being closed at the radially inner ends by said filtering sheet material, said radially inwardly open radial spaces and the other radial spaces being circumferentially alternately arranged, the axially opposite ends of said ring-like structure being provided with end walls in which radial slits are formed in communication with said the other radial spaces and said the other radial spaces having radially outer ends in the form of substantially axial slits open in the outer periphery of said ring-like structure, said raial and axial slits forming passages for a fluid to be filtered.
- 12. A filter element including a generally ring-like structure including a plurality of generally radial sections each converging generally radially inwardly and having a plurality of generally circumferential zigzag pleats of a filtering sheet material, said radial sections being circumferentially arranged such that the radially inner ends of said radial sections cooperate to define a central space disposed substantially centrally of said ring-like structure and generally radial spaces are defined between said radial sections the zigzag pleats of each radial section having circumferential dimensions which are substantially gradually decreased radially inwardly of said ring-like structure, some of said radial spaces being radially inwardly open to said central space and being closed at the radially outer ends by said filtering sheet material, the other radially spaces being closed at the radially inner ends by said filtering sheet material, said radially inwardly open radial spaces and the other radial spaces being circumferentially alternately arranged, and said radially inwardly open radial spaces being closed at the axially opposite ends by end walls, said ring-like structure further including at least one additional radial section formed of a block of a fluid-permeable material having a fluid-permeability different from those of the other radial sections.
Specification