Rotary valve

{
  "publication_number": "US9927040B2",
  "country": "US",
  "kind": "B2",
  "title": "Rotary valve",
  "abstract": "A rotary valve comprising a rotor shaft support assembly for maintaining a rotor shaft 5 in a level orientation when the rotor shaft is supported at a single end only. The rotor shaft support assembly (101) comprises a removable casing end plate (102) and a bearing assembly (106) for supporting an end portion of the rotor shaft (104) inserted into the rotor shaft support assembly (101) and through a rotor shaft aperture (105) of the removable casing end plate (102), and is adjustable to correct any deviation of 10 the pitch of the rotor shaft (104) from a level orientation relative to the removable casing end plate (102) when the rotor shaft (104) is supported at a single end only by the rotor shaft support assembly (101) with the inserted end portion of the rotor shaft (104) supported within the removable casing end plate (102) and the bearing assembly (106).",
  "claims": [
    "1. A rotary valve for conveying fluids, powders or granular substances, said rotary valve comprising: a rotor having a rotor shaft and vanes, and a casing for housing the rotor within the interior of the casing, said casing comprising a removable casing end plate defining a rotor shaft aperture into which an end portion of the rotor shaft is insertable; wherein said rotary valve comprises a rotor shaft support assembly, said rotor shaft support assembly comprises said removable casing end plate and a bearing assembly for supporting an end portion of the rotor shaft inserted from the inner side of the removable casing end plate into the rotor shaft support assembly and through said rotor shaft aperture of the removable casing end plate, said rotor shaft support assembly is adjustable to correct any deviation of the pitch of the rotor shaft from a level orientation relative to said removable casing end plate when the rotor shaft is supported at a single end only by the rotor shaft support assembly with the inserted end portion of the rotor shaft supported within the removable casing end plate and the bearing assembly, said rotor shaft support assembly comprises a tail piece, said tail piece comprises a substantially tubular body having inner and outer ends and a flange extending radially outwardly of the outer surface of the substantially tubular body, said bearing assembly is disposed radially around the outer surface of the tail piece, said end portion of said rotor shaft is removably locatable within said tail piece to be supported within the removable casing end plate and the bearing assembly, and said bearing assembly comprises a bearing housing and inner and outer bearing adjustment rings each in threaded engagement with, and rotatable within, said bearing housing.",
    "2. A rotary valve as claimed in claim 1, wherein said flange is positioned axially between said inner and outer ends of said tail piece.",
    "3. A rotary valve as claimed in claim 1, wherein said bearing assembly further comprises a first, inner rolling bearing, a second, outer rolling bearing and a spacing ring disposed therebetween, all located between said inner and outer bearing adjustment rings.",
    "4. A rotary valve as claimed in claim 1, wherein said bearing assembly comprises a bearing housing and inner and outer bearing adjustment rings each in threaded engagement with, and rotatable within, said bearing housing, and said flange of said tail piece is axially located between said inner and outer bearing adjustment rings.",
    "5. A rotary valve as claimed in claim 1, wherein said bearing assembly comprises a bearing housing and inner and outer bearing adjustment rings each in threaded engagement with, and rotatable within, said bearing housing, said bearing assembly further comprises a first, inner rolling bearing, a second, outer rolling bearing and a spacing ring disposed therebetween, all located between said inner and outer bearing adjustment rings, and said flange of said tail piece is axially located between said inner bearing adjustment ring and said first, inner rolling bearing.",
    "6. A rotary valve as claimed in claim 5, wherein said inner bearing adjustment ring comprises an annular abutment shoulder that extends outwardly and axially over the flange of said tail piece and abuts said first, inner rolling bearing.",
    "7. A rotary valve as claimed in claim 6, wherein the outer bearing adjustment ring abuts the second, outer rolling bearing.",
    "8. A rotary valve as claimed in claim 1, wherein said bearing housing defines a threaded aperture within which a fine adjustment screw is received, said fine adjustment screw in contact with and rotatable against the removable casing end plate.",
    "9. A rotary valve as claimed in claim 1, wherein said removable casing end plate defines a threaded aperture within which a screw is received, said screw in contact with and rotatable against an outer surface of the inner bearing adjustment ring.",
    "10. A rotary valve as claimed in claim 1, wherein a threaded aperture is defined in the end of said end portion of the rotor shaft, a threaded aperture is defined in the end of the outer end of the substantially tubular body of said tail piece, and said rotor shaft support assembly further comprises: a rotor shaft securing screw, a tail piece securing screw, and a retaining washer defining apertures corresponding to said threaded apertures of the rotor shaft and the tail piece; the rotor shaft and said tail piece being fixed to rotate together when the rotor shaft and tail piece securing screws extend through the retaining washer and are in threaded engagement with the rotor shaft and the tail piece respectively.",
    "11. A rotary valve as claimed in claim 10, wherein said bearing assembly comprises a bearing housing and inner and outer bearing adjustment rings each in threaded engagement with, and rotatable within, said bearing housing, said bearing assembly further comprises a first, inner rolling bearing, a second, outer rolling bearing and a spacing ring disposed therebetween, all located between said inner and outer bearing adjustment rings, said flange of said tail piece is axially located between said inner bearing adjustment ring and said first, inner rolling bearing, and the flange of the tail piece is held against the first, inner rolling bearing when the rotor shaft and said tail piece are fixed to rotate together.",
    "12. A rotary valve as claimed in claim 10, wherein a face is formed along the rotor shaft at a point of increased diameter of the rotor shaft, and the face is held against the inner end of the tail piece when the rotor shaft and said tail piece are fixed to rotate together.",
    "13. A rotary valve as claimed in claim 1, wherein said removable casing end plate is coupled with a pair of rails that are slidably coupled to the main body of the casing.",
    "14. A rotary valve for conveying fluids, powders or granular substances, said rotary valve comprising: a rotor having a rotor shaft and vanes, and a casing for housing the rotor within the interior of the casing, said casing comprising a removable casing end plate defining a rotor shaft aperture into which an end portion of the rotor shaft is insertable; wherein said rotary valve comprises a rotor shaft support assembly, said rotor shaft support assembly comprises said removable casing end plate and a bearing assembly for supporting an end portion of the rotor shaft inserted from the inner side of the removable casing end plate into the rotor shaft support assembly and through said rotor shaft aperture of the removable casing end plate, said rotor shaft support assembly is adjustable to correct any deviation of the pitch of the rotor shaft from a level orientation relative to said removable casing end plate when the rotor shaft is supported at a single end only by the rotor shaft support assembly with the inserted end portion of the rotor shaft supported within the removable casing end plate and the bearing assembly, and said bearing assembly comprises a bearing housing and inner and outer bearing adjustment rings each in threaded engagement with, and rotatable within, said bearing housing."
  ],
  "description_excerpt": "The present invention relates to a rotary valve for conveying fluids, powders or granular substances.\n\nRotary valves are used in a variety of different industries, including the pharmaceutical, chemical and food industries. A rotary valve is usable to transfer fluids, powders or granular substances from one stage of a processing line to another.\n\nA typical rotary valve comprises a casing, which has an upper inlet and a lower outlet, in which a rotor comprising a rotor shaft and vanes is housed. Solid bulk product may be conveyed through the rotary valve with the assistance of a gas (typically air) pressure differential.\n\nA rotary valve may be used to control the rate of flow of a product, and may have an explosion/flame-containment design. To achieve high sealing and feeding efficiency, the clearance between the rotor vanes and the casing must be maintained within a narrow tolerance range. However it is usual for the rotor to be removed regularly from the casing, to allow cleaning. A problem exists with maintaining proper alignment of the rotor when the rotor has been removed from, and is to be subsequently replaced in, the casing.\n\nA type of rotary valve is known in which an end portion of the rotor shaft is supported within a bearing assembly of a removable end plate of the casing, the removable end plate being coupled with a pair of guide rails that are slidably coupled to the main body of the casing.",
  "cpc": [
    "F16K 27/02",
    "B65G 53/4633",
    "F16K 1/34",
    "F16K 3/06",
    "F16K 3/314",
    "F16K 31/44"
  ],
  "ipc": [
    "B65G 53/46",
    "F16K 1/34",
    "F16K 27/02",
    "F16K 31/44"
  ],
  "assignees": [
    "ROTA VAL Ltd"
  ],
  "inventors": [
    "David Hammond",
    "Derek Smith"
  ],
  "filing_date": "2015-09-24",
  "publication_date": "2018-03-27",
  "grant_date": "2018-03-27",
  "priority_date": "2014-09-26",
  "application_number": "US-201514864744-A",
  "family_id": "51901199",
  "cited_by_count": 0,
  "citations": [
    "US4906144A",
    "US5002084A",
    "DE4135594A1",
    "DE4301774A1",
    "US6186164B1",
    "CN202321531U"
  ]
}