US2203654A - Ventilating device for centrifuge casings - Google Patents

Ventilating device for centrifuge casings Download PDF

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Publication number
US2203654A
US2203654A US248466A US24846638A US2203654A US 2203654 A US2203654 A US 2203654A US 248466 A US248466 A US 248466A US 24846638 A US24846638 A US 24846638A US 2203654 A US2203654 A US 2203654A
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United States
Prior art keywords
spindle
casing
basket
duct
centrifuging
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US248466A
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English (en)
Inventor
Frederick W Kunkel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Priority to US248466A priority Critical patent/US2203654A/en
Priority to GB33104/39A priority patent/GB534133A/en
Priority to FR867404D priority patent/FR867404A/fr
Application granted granted Critical
Publication of US2203654A publication Critical patent/US2203654A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B15/00—Other accessories for centrifuges
    • B04B15/08—Other accessories for centrifuges for ventilating or producing a vacuum in the centrifuge

Definitions

  • the present invention relates to an improved form of centrifuging device which is particularly adaptedfor centrifuging nitro-cellulose or similar materials.
  • a stage in the process when the product is easily denitrated by contact with air at high water content. This stageoccurs when the acid has been centrifuged off the 0 product and before the product has been soused in water.
  • denitrated products when dissolved in solvents, have portions which are rendered insoluble by partial denitration so that such products are not satisfactory when used as a dope for making photographic filmbase.
  • the present invention has as one of its objects the provision of a centrifuging device which is ventilated to permit normal operation under any humidity conditions encountered in operation, without any loss of product quality.
  • Another object of the invention is the provision of a ventilating duct positioned within the centrifuging case and surrounding the basket spindle so that any leakage along the spindle is immediately exhausted from the casing, thus preventing outside air from reaching the nitro-celescaping into the room, and the flow of humid room air into the centrifuging basket is eliminated.
  • FIG. 1 shows a vertical sectional view through a centrifuging device of standard construction, showing the relation thereto of ,a ventilating duct and spindle seal construction constructed in accordance with the present invention.
  • Fig. 2 is a view similar to Fig. 1, showing a modified form of ventilating duct and spindle seal; and l l Fig. 3 is a plan view of the arrangement illustrated in Fig. 2.
  • the present invention is embodied in an apparatus based on the use of a centrifuging case which is made practically air tight. with the exception of the point where the basket spindle enters the case. Prior to the present invention no practical seal had been found for this point.
  • the present invention provides a ventilating duct which extends across the casing. in such a way thatthe basket spindle passesdirectly through the duct. In this way, any leakage which tends to pass along the spindle will flow into the duct from which it is exhausted to a point outside the centrifuging casing. In this way, outside air is prevented from entering the centrifuge basket during the centrifuging operation, thus effectively preventing denitration of material in the basket.
  • This arrangement also eliminates changes inthe atmosphere of the centrifuging casing when the centrifuge is in operation.
  • the ventilating duct is placed so that the main vent opening thereof is along the back edge of the door and just under the casing cover or top.
  • the drawing shows a centrifuging device constructed in accordance with the present invention.
  • the device shown in Fig. 1 comprises, in general, the, stationary. cylindrical outer casing formed to provide ,a bottom H, upwardly extending sides l2 and inclined or sloping top 4.
  • a bottom discharge perforated centrifuging basket 15, of standard or well-known construction, is positioned within but out of contact with the casing.
  • This basket is supported and r0- tated by means of a vertical spindle l6 which extends upwardly through an enlarged neck formed in the top portion, as clearly shown in Fig. 1.
  • the casing is air tight, as later explained, except Where the spindle I6 passes through the neck I I.
  • the spindle I6 is supported at the upper end in a suitable bearing, not shown.
  • the spindle and basket thus hang in suspended relation from the. bearing much in the manner of the wellkhown'pendulum.
  • any eccentric loading of the basket I5 will cause the latter, and spindle I6, to sway from side to side, as is well-known.
  • the opening H3 in the neck I1 is made a sufficient size to accommodate the maximum swing without the spindle touching the sides of the neck.
  • , and 22 are provided, the plates 2
  • the plate is secured, by countersunk rivets 23, or other suitable fastening means, to an outturned portion or flange 24 formed on the neck l1, while the plate 2
  • are provided with registering central openings 28 and 21 respectively which are equal in size to the opening
  • the plate 22 is provided with an opening which is slightly larger than the spindle IE to afford a substantially tight fit therearound, but of sufficient size that the plate, as well as the plate 2
  • the spindle I6 sways, as pointed out above, the plates 2
  • the spindle l6 has enlarged ends, not shown, which are of larger diameter than the opening 30 in the plate 22, the latter is split, as shown in Fig. 3, so that it may be positioned on the spindle.
  • are so proportioned that even with the maximum sway of the spindle, the opening I8 will not be uncovered.
  • and 22 thus afford a relatively tight seal at the point where the Spindle l6 passes through the top of the casing, yet permits free radial movement of the spindle,
  • 5 will create a vacuum within the basket, the area of highest vacuum being of course along the spindle I6. With such a vacuum, outside air may be drawn along the spindle and through the opening 3
  • Such leakage of outside air into the casing may denitrate the nitro-cellulose, as pointed out above:
  • the present invention provides a ventilating duct positioned within the casing, and arranged to vent such leakage to a point outside the casing, thus preventing denitration of the material in the basket l5.
  • this ventilating duct is' formed by means of a horizontal plate or baffle which is secured to the side wall I2 of the casing and extend part way across the casing, terminating short of the opposite side wall, as shown in Fig. 1.
  • This bafile is spaced from the inclined top l4 but cooperation therewith to provide a ventilating duct 36 which converges tothe right.
  • An exhaust connection 37 is secured to the side l2 and is in fluid communication with the duct 36 so that any air or fumes which are drawn into the duct may be suitably vented to a point outside the casing. Suitable exhaust equipment, not shown, is applied to the connection 31.
  • the baffle 35 is formed of any suitable material, preferably stainless steel, and is provided with an opening 38 through which the spindle l6 extends. This opening 38 is made of sufficient size to prevent engagement of the spindle l6, therewith even for maximum spindle sway.
  • the opening 38 in the baflie is covered with a split sealing plate 39, similar to or identical with the plate 20, formed with an opening 40 which is slightly larger than the spindle l6 and through which the latter passes.
  • the plate 39 is also movable radially with the spindle l6, sliding on the baflle 35, and thus cooperates with the plates 20, 2
  • nitro-cellulose is loaded into-the basket l5 through a loading pipe 4
  • a door 44 hinged along one edge 45 to the top I4, is opened.
  • a handle 46 may be provided for facilitating opening and closing of the door 44.
  • a suitable gasket 41 may be provided for forming an air seal around the door when the latter is closed.
  • the ventilating duct 36 as shown in Fig. 1, provides a main vent opening 50 which is positioned along the-back edge 45 of a ventilating duct for the basket spindle, parts of the centrifuging casing.
  • corresponding to thOSEl in Fig. 1 will be designated by the same numerals.
  • the left portion MA of the top is flat rather than inclined as in Fig. 1.
  • An exhaust pipe or duct 55 connected to a suitable source of vacuum not shown, extends across the top 14A and terminates at 56 adjacent the hinged edge 45 of the door 44, as clearly shown in Fig. 2.
  • the top wall 51. of the duct 55 is provided with a relatively large opening 58 through which the spindle It extends.
  • the opening 58 is substantially the same size as the opening I8, Fig. 1, and is closed by the plates 20, 2
  • the spindle It extends through the opening 35 of the plate 22 in a manner described in connection with Fig. 1.
  • a U-shaped plate member fill of the shape best shown in Fig. 3, is secured to and depends from the edges of an opening 6
  • a horizontal baffle 01' plate 62 closes the bottom of the member 55 and cooperates therewith to provide a portion of the duct 55 which surrounds the spindle It, as shown in Fig. 2,
  • the baffle 62 is also formed with an opening 63 which is covered by the split plate 39 through the opening 40 of which the spindle l6 passes, as above described. In this way leak age along the spindle I6 is exhausted through the duct 55.
  • the right end of the U-shaped member 60 terminates adjacent the rear end 45 of the door to provide a main vent opening 64 for exhausting any leakage which may tend to enterthe casing when the door 44 is opened, as clearly indicated by the arrows in Fig. 2.
  • the disclosed ventilating duct provides an effective air seal for the basket and spindle during the centrifuging operation, and for the door during theunloading operation, thus preventing denitration of the cellulose nitrate in the centrifuging basket. It is also apparent from an inspection of Figs. 1 and 3 that a portion of the ventilating duct surrounds the basket spindle l5.
  • a basket driving spindle extending through said top, of a ventilating duct having a portion thereof positioned within said casing so that said spindle passes therethrough to provide an air seal for said spindle, and a main vent openingfor said duct adjacent said door.
  • a centrifuging device the combination with a casing having a top, a door in said top, a rotatable basket positioned within said casing basket driving spindle extending through said top, of a baffle extending across said casing in spaced relation to said top and cooperating therewith to provide an air seal duct through which said spindle passes, and a main vent opening for said duct adjacent said door, and an exhaust connection for said duct.
  • a centrifuging device the combination with a casing having atop, a door hinged along one edge to said top, a rotatable basket positioned within said casing and adapted to hold material to be centrifuged, a basket driving spindle extending through said top, of a horizontal bave extending across said casing in spaced relation to said top and cooperating therewith to provide a ventilating duct through which said spindle passes to prevent air leaking along said spindle, a main vent opening for said duct adjacent said edge, and an exhaust connection for said duct. 4.
  • a centrifuging device the combination with a casing having side and top walls, a rotatable basket positioned within said casing and and adapted to hold material to be centrifuged, a
  • a basket driving spindle extending through said top wall, a door hinged along one edge to said top wall adjacent said one side thereof, of a horizontal bafile operatively connectedlto one of said walls and extending across said casing in spaced relation to said top andcooperating therewith to provide a ventilating duct through'which said spindle passes, said duct providing an air seal for said spindle to prevent air leaking along said spindle from entering said basket, a main vent opening for said duct adjacent said one edge, and an exhaust connection on said side wall connected to said duct.
  • a centrifuging device the combination with an outer casing having a top, a rotatable basket positioned within said casing and adapted to hold material to be centrifuged, a spindle projecting exteriorly of said casing for supporting and rotating said basket, of a horizontal balfie extending across said casing in spaced relation to said top to provide a ventilating duct through which said spindle passes, said top and baflle being formed with registering openings for said spindle, plates surroundingsaid spindle and covering said openings to provide seals for said spindle where it passes through said top and said bafiie, said'plates being movable radially with said spindle but nonrotatable therewith, and an exhaust connection for said duct.
  • a centrifuging device the combination with an outer casing having atop, a rotatable basket positioned within said casing and adapted to hold material to be centrifuged, a supporting and driving spindle for said basket, a door hinged along one edge of said top, of a baffle extending horizontally across said casing in spaced relation to said top and cooperating therewith to provide a ventilating duct'through which said spindle passes, said top and baffle being formed with aligned openings for said spindle, apertured plates surrounding said spindle and overlying said opening to provide seals for said duct at the points where said spindle passes therethrough certain of said plates being slidable on said top and said bafile when said spindle moves radially, a main vent opening for said duct adjacent said one edge, and an exhaust connection for said duct.

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  • Centrifugal Separators (AREA)
US248466A 1938-12-30 1938-12-30 Ventilating device for centrifuge casings Expired - Lifetime US2203654A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US248466A US2203654A (en) 1938-12-30 1938-12-30 Ventilating device for centrifuge casings
GB33104/39A GB534133A (en) 1938-12-30 1939-12-30 Improvements in ventilating device for centrifuge casings
FR867404D FR867404A (fr) 1938-12-30 1939-12-30 Dispositif de ventilation pour centrifugeuse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US248466A US2203654A (en) 1938-12-30 1938-12-30 Ventilating device for centrifuge casings

Publications (1)

Publication Number Publication Date
US2203654A true US2203654A (en) 1940-06-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
US248466A Expired - Lifetime US2203654A (en) 1938-12-30 1938-12-30 Ventilating device for centrifuge casings

Country Status (3)

Country Link
US (1) US2203654A (fr)
FR (1) FR867404A (fr)
GB (1) GB534133A (fr)

Also Published As

Publication number Publication date
GB534133A (en) 1941-02-27
FR867404A (fr) 1941-10-27

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