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EP0636338A2
Expired / Lapsed
EP
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Shroud and cyclonic cleaning apparatus incorporating same
Assignee: Dyson Technology Ltd
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Filing: 1991-12-03
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Granted: —
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Expires: 2011-12-03
Abstract
Abstract A shroud for use in a dual inner and outer cyclonic vacuum cleaner (10) is described. The shroud has a cylindrical section (50c, 132) adjacent an inner surface 15b, 111b) of a cyclonic container (15,111) and preferably comprises a combined shroud disc unit (50). The combined shroud and disc unit fits on the outside surface (20c) of the inner cyclone (20) and aids in removal of first and fibrous matter from the airflow in the outer cyclone (15). Improved airflow between the outer cyclone (15) and inner cyclone (20) is achieved because of the shroud and disc unit (50).
Inventors
- 👤 James Dyson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 19:05
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/10; A47L9/16; A47L9/1616; A47L9/1625; A47L9/1633; A47L9/165; B; B04; B04C; B04C11/00; B04C5/00; B04C5/08; B04C5/24; B04C5/26; Y; Y10; Y10S; Y10S55/00; Y10S55/03
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
389 words
Shroud means (50,150,250) for use in cleaning apparatus (10), the cleaning apparatus (10) including: a container (15) having a circular cross-section and comprising a bottom (40d) and a sidewall extending to and meeting the bottom (40d), the sidewall having an interior surface (15a), a dirty air inlet (27) which is oriented for supplying dirt laden air into the container (15) tangentially to the interior surface (15a) of the sidewall, and an air outlet from the container (15); a circular cross-sectioned cyclone (20) having a longitudinal axis and mounted inside the container (15), the cyclone (20) comprising a cyclone air inlet (36) at an upper end of the cyclone (20) in air communication with the air outlet of the container, an interior dirt rotational surface (20a) of frusto-conical shape for receiving an air flow from the air inlet (36) and for maintaining its velocity to a cone opening (20b) smaller in diameter than the diameter of the upper end of the cyclone (20), the air inlet (36) being oriented for supplying air tangentially to the interior dirt rotational surface (20a), an outer surface (20c) of frusto-conical shape, and a cyclone air outlet (33) communicating with the interior of the cyclone (20) adjacent the upper end of the cyclone (20); a dirt collecting receiver (40) extending from the the cone opening (20b); and means for generating an airflow which passes sequentially through the dirty air inlet (27), the container (15), the cyclone air inlet (36), the cyclone (20), the dirt receiver (40) and the cyclone air outlet (33), the airflow rotating around the frusto-conical interior surface (20a) of the cyclone (20) and depositing dirt in the receiver (40); the shroud means (50,150,250) being mountable on and around the outer surface (20c) of the cyclone (20) and, when in use, having opposed ends spaced in the direction of the longitudinal axis of the cyclone (20) and providing an air passageway from the container (15) to the air inlet (36) of the cyclone (20), one of the ends of the shroud means (50,150,250) being sealed against the outer surface (20c) of the cyclone (20), characterised in that a portion of the shroud (50,150,250) has a cylindrical perforated section (50c,150c,250c) having a large number of perforations (50e,150e,250e), the perforated section (50c,150c,250c) being spaced from the interior wall (15a) of the sidewall of container (15).
Claim 2
Dependent Claim
40 words
Shroud means as claimed in claim 1, wherein the end of the shroud means (50,150,250) which is sealed against the outer surface (20c) of the cyclone (20) comprises a web section (50d,150d,250d) which abuts directly against the outer surface (20c).
Claim 3
Dependent Claim
37 words
Shroud means as claimed in claim 1 or 2, wherein the perforations (50e,150e,250e) through the perforated section (50c,150c,250c) are circular and are provided around a circumferential extent of the perforated section (50c,150c,250c) of the shroud means (50,150,250).
Claim 4
Dependent Claim
16 words
Shroud means as claimed in claim 3, wherein the circular perforations have a diameter of 2.2mm.
Claim 5
Dependent Claim
44 words
Shroud means as claimed in any one of the preceding claims, wherein, in use, the perforated section (50c,150c,250c) of the shroud means (50,150,250) is located between 0.59 inches and 1.38 inches (1.5 cm and 3.5 cm) from the inside wall (15a) of the container.
Claim 6
Dependent Claim
76 words
Shroud means as claimed in any one of the preceding claims, wherein the shroud means (50,150,250) has a flanged section (50b,150b,250b) above the cylindrical section (50c,150c,250c), the flanged section (50,150,250) being locatable around the longitudinal axis at an end of the cyclone (20) adjacent the air inlet (36) and in closely spaced relationship to the outside (20c) of the cyclone (20) so as to provide, in use, a chamber (32) leading to the air inlet (36).
Claim 7
Dependent Claim
98 words
Shroud means as claimed in any one of the preceding claims, wherein disc means (50h,150h,250h) are provided at a lower longitudinal extent of the shroud means (50,150,250), the disc means (50h,150h,250h) being locatable around the axis of the cyclone (20) with a space between the interior surface (15a) of the sidewall of the container (15) and the disc means (50h,150h,250h) for passage of air therebetween, such that, in use, the disc means (50h,150h,250h) aid in dirt removal in the container (15) by preventing some of the dirt from flowing to the air inlet (36) of the cyclone (20).
Claim 8
Dependent Claim
44 words
Shroud means as claimed in claim 8, wherein the shroud means (50,150,250) and the disc means (50h,150h,250h) form an integral unit slidable over the outer surface (20c) of the cyclone (20) such that the cone opening (20b) protrudes below and out of the unit.
Claim 9
Dependent Claim
110 words
Shroud means as claimed in claim 7 or 8 when dependent on claim 2, wherein a lower section (50f,150f,250f) of the shroud means (50,150,250) depending from a radius of the web section (50d,150d,250d) of the shroud means (50,150,250) supports the disc means (50h,150h,250h) and is locatable in sealed relationship with the outside wall (20c) of the cyclone (20) so that, in use, the airflow in the container (15) must travel over the disc means (50h,150h,250h) and past an outside surface of a lower section of the shroud means (50,150,250) before passing through the openings (50e,150e,250e) in the cylindrical section (50c,150c,250c) leading to the air inlet (36) of the cyclone (20).
Claim 10
Dependent Claim
21 words
Shroud means as claimed in any one of claims 7 to 9, wherein the disc means (50h,150h,250h) are circular in cross-section.
Claim 11
Dependent Claim
46 words
Shroud means as claimed in any one of claims 7 to 10, wherein the disc means (50h,150h,250h) have a conical shape around the shroud means (50,150,250) such that, in use, a larger portion of the conical shape faces towards the bottom (40d) of the container (15).
Claim 12
Dependent Claim
54 words
Shroud means as claimed in claim 11, wherein the conical shape, when viewed as a cross-section of the shroud means (50,150,250) and disc means (50h,150h,250h) through the longitudinal axis, is downwardly inclined at an angle of between 7-1/2° and 20° with respect to a line perpendicular to the longitudinal axis of the cyclone (20).
Claim 13
Dependent Claim
42 words
Shroud means as claimed in any one of claims 7 to 12, wherein, in use, the disc means (50h,150h,250h) are positioned at about one third of the distance between the cone opening (20b) and the air inlet (36) of the cyclone (20).
Claim 14
Dependent Claim
282 words
Cleaning apparatus (10) including a container (15) having a circular cross-section and comprising a bottom (40d) and a sidewall extending to and meeting the bottom (40d), the sidewall having an interior surface (15a), a dirty air inlet (27) which is oriented for supplying dirt laden air into the container (15) tangentially to the interior surface (15a) of the sidewall and an air outlet from the container (15); a circular cross-sectioned cyclone (20) having a longitudinal axis and mounted inside the container (15), the cyclone comprising a cyclone air inlet at an upper end of the cyclone in air communication with the air outlet of the container, an interior dirt rotational surface (20a) of frusto-conical shape for receiving an airflow from the air inlet (36) and for maintaining its velocity to a cone opening (20b) smaller in diameter than the diameter of the upper end of the cyclone (20), the air inlet (36) being oriented for supplying air tangentially to the interior dirt rotational surface (20a), an outer surface (20c) of frusto-conical shape, and a cyclone air outlet (33) communicating with the interior of the cyclone (20) adjacent the upper end of the cyclone (20); a dirt collecting receiver (40) extending from the cone opening (20b); and means for generating an airflow which passes sequentially through the dirty air inlet (27), the container (15), the cyclone air inlet (36), the cyclone (20), the dirt receiver (40) and the cyclone air outlet (33), the airflow rotating around the frusto-conical interior surface (20a) of the cyclone (20) and depositing the dirt in the receiver (40); characterised in that the cleaning apparatus (10) further includes shroud means (50,150,250,) according to any one of the preceding claims.
References Cited (Backward Citations)
No citation records indexed.
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