Molded spiral vane and linear component for a centrifuge

Details Molded spiral vane and linear component for a centrifuge Molded spiral vane and linear component for a centrifuge

2001-07-20

2003-04-22

Reifsnyder, David A. (Department: 1723)

Imperforate bowl: centrifugal separators

Rotatable bowl

Including structure located within vertically-oriented bowl...

C494S049000, C494S060000, C494S067000, C494S068000, C494S074000, C494S075000, C494S901000, C184S006240

Reexamination Certificate

active

06551230

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates generally to the continuous separation of particulate matter from a flowing liquid by the use of a centrifugal field. More specifically the present invention relates to the use of spiral plates or vanes within the centrifuge bowl in cooperation with a suitable propulsion arrangement for self-driven rotation of the spiral vanes. In one embodiment of the present invention, the propulsion arrangement includes the use of jet nozzles. In other embodiments of the present invention, the specific shape and style of the spiral vanes are modified, including the embodiment of flat (planar) plates. Also, in these other embodiments, the styling of the cooperating components is modified, thereby providing different final assembly embodiments.
Since the use of spiral vanes in the preferred embodiment of the present invention is a design change to the prior art technology employing a cone-stack subassembly as the basis for particulate matter separation from the flowing liquid, a review of this cone-stack technology may be helpful in appreciating the differences between the present invention and the prior art and the benefits afforded by the present invention.
U.S. Pat. No. 5, 575,912, which issued Nov. 19, 1996 to Herman et al., discloses a bypass circuit centrifuge for separating particulate matter out of a circulating liquid. The construction of this centrifuge includes a hollow and generally cylindrical centrifuge bowl which is arranged in combination with a base plate so as to define a liquid flow chamber. A hollow center tube axially extends up through the base plate into the hollow interior of the centrifuge bowl. The bypass circuit centrifuge is designed so as to be assembled within a cover assembly and a pair of oppositely-disposed tangential flow nozzles in the base plate are used to spin the centrifuge within the cover so as to cause particles to separate out from the liquid. The interior of the centrifuge bowl includes a plurality of truncated cones which are arranged into a stacked array and are closely spaced so as to enhance the separation efficiency. The stacked array of truncated cones is sandwiched between a top plate positioned adjacent to the top portion of the centrifuge bowl and a bottom plate which is positioned closer to the base plate. The incoming liquid flow exits the center tube through a pair of oil inlets and from there flows through the top plate. The top plate in conjunction with ribs on the inside surface of the centrifuge bowl accelerate and direct this flow into the upper portion of the stacked array of truncated cones. As the flow passes radially inward through the channels created between adjacent cones, particle separation occurs. Upon reaching the inner diameter of the cones, the liquid continues to flow downwardly to the tangential flow nozzles.
U.S. Pat. No. 5,637,217, which issued Jun. 10, 1997 to Herman et al., is a continuation-in-part patent based upon U.S. Pat. No. 5,575,912. The U.S. Pat. No. 5,637,217 discloses a bypass circuit centrifuge for separating particulate matter out of a circulating liquid. The construction of this centrifuge includes a hollow and generally cylindrical centrifuge bowl which is arranged in combination with a base plate so as to define a liquid flow chamber. A hollow center tube axially extends up through the base plate into the hollow interior of the centrifuge bowl. The bypass circuit centrifuge is designed so as to be assembled within a cover assembly and a pair of oppositely-disposed tangential flow nozzles in the base plate are used to spin the centrifuge within the cover so as to cause particles to separate out from the liquid. The interior of the centrifuge bowl includes a plurality of truncated cones which are arranged into a stacked array and are closely spaced so as to enhance the separation efficiency. The incoming liquid flow exits the center tube through a pair of oil inlets and from there is directed into the stacked array of cones. In one embodiment, a top plate in conjunction with ribs on the inside surface of the centrifuge bowl accelerate and direct this flow into the upper portion of the stacked array. In another embodiment the stacked array is arranged as part of a disposable subassembly. In each embodiment, as the flow passes through the channels created between adjacent cones, particle separation occurs as the liquid continues to flow downwardly to the tangential flow nozzles.
U.S. Pat. No. 6,017,300, which issued Jan. 25, 2000 to Herman discloses a cone-stack centrifuge for separating particulate matter out of a circulating liquid. The construction of this centrifuge includes a cone-stack assembly which is configured with a hollow rotor hub and is constructed to rotate about an axis. The cone-stack assembly is mounted onto a shaft center tube which is attached to a hollow base hub of a base assembly. The base assembly further includes a liquid inlet, a first passageway, and a second passageway which is connected to the first passageway. The liquid inlet is connected to the hollow base hub by the first passageway. A bearing arrangement is positioned between the rotor hub and the shaft center tube for rotary motion of the cone-stack assembly. An impulse-turbine wheel is attached to the rotor hub and a flow jet nozzle is positioned so as to be directed at the turbine wheel. The flow jet nozzle is coupled to the second passageway for directing a flow jet of liquid at the turbine wheel in order to impart rotary motion to the cone-stack assembly. The liquid for the flow jet nozzle enters the cone-stack centrifuge by way of the liquid inlet. The same liquid inlet also provides the liquid which is circulated through the cone-stack assembly.
U.S. Pat. No. 6,019,717, which issued Feb. 1, 2000 to Herman is a continuation-in-part patent based upon U.S. Pat. No. 6,017,300. The U.S. Pat. No. 6,019,717 discloses a construction which is similar to the construction of the parent patent, but which includes the addition of a honeycomb-like insert which is assembled into the flow jet nozzle in order to reduce inlet turbulence and improve the turbine efficiency.
The increased separation efficiency provided by the inventions of the U.S. Pat. Nos. 5,575,912; 5,637,217; 6,017,300; and 6,019,717 is attributed in part to reduced sedimentation distance across the cone-to-cone gap. During the conception of the present invention, it was theoretically concluded that an equivalent effect could be achieved by converting the cone-stack subassembly into a radiating series of spiral vanes or plates with a constant axial cross-section geometry. The spiral vanes of the present invention, as described in some of the invention embodiments which will be described in greater detail, are integrally joined to a central hub and a top plate. In another related embodiment, the spiral vanes are also integrally joined to the liner shell as a unitary component. The preferred embodiment describes these combinations of component parts as a unitary and molded combination such that there is a single component. The top plate works in conjunction with acceleration vanes on the inner surface of the shell so as to route the exiting flow from the center portion of the centrifuge to the outer peripheral edge portion of the top plate where flow inlet holes are located. A divider shield located adjacent the outer periphery of the top plate functions to prevent the flow from diverting or bypassing the inlet holes and thereafter enter the spiral vane module through the outside perimeter between the vane gaps. If the flow was permitted to travel in this fashion, it could cause turbulence and some particle re-entrainment, since particles are being ejected in this zone. In the configuration of each spiral vane of certain embodiments, the outer peripheral edge is formed with a turbulence shield which extends the full axial length of each spiral vane as a means to further reduce fluid interaction between the outer quiescent sludge collection zone and the gap between adjacent spiral vanes where liquid flow an

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