JP3660882B2 - Self-driven centrifuge with wing module - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention generally relates to the continuous separation of particulate matter from a flowing liquid using a centrifugal force field. More particularly, the present invention relates to the use of a helical plate or wing in a centrifuge bowl in conjunction with a suitable propulsion device for automatically driving the helical wing.
[0002]
In one embodiment of the invention, the propulsion device includes using a jet nozzle. In another embodiment of the invention, the specific shape and type of the spiral wing is altered and a flat plate embodiment is included.
[0003]
The use of spiral wings in the preferred embodiment of the present invention provides a basis for separating particulates from the flowing liquid.Assembly of stacked conical membersThis is a design change with respect to the prior art using. thisPrior art using an assembly of stacked conical membersIs helpful in understanding the differences between the present invention and the prior art and the advantages provided by the present invention.
[0004]
[Prior art]
US Pat. No. 5,575,912, granted to Herman et al. On November 19, 1996, discloses a bypass circuit centrifuge for separating particulates from circulating fluids. The structure of this centrifuge includes a hollow, entirely cylindrical centrifuge bowl,Base plateIn combination with the liquid flow chamber. The hollow center tubeBase plateAnd extends axially upward into the hollow interior of the centrifuge bowl. The bypass circuit centrifuge is designed to be assembled in a cover assembly,Base plateThe centrifuge is rotated in the cover using a pair of tangential flow nozzles placed face to face to separate the particles from the liquid. Inside the centrifuge bowl are severalFrustoconical memberAnd these are providedConical memberIsStacked arrayAnd are closely spaced apart to enhance separation efficiency.Frustoconical memberConsist ofStacked arrayAn upper plate positioned adjacent to the upper part of the centrifuge bowl andBase plateIs sandwiched between the lower plate positioned close to The incoming liquid stream exits through a pair of oil inlets and from there through the upper plate. The upper plate accelerates this flow in relation to the ribs provided on the inner surface of the centrifuge bowl,Frustoconical memberConsist ofStacked arrayPoint to the top. AdjacentConical memberParticle separation occurs when flow passes radially inward through channels formed therebetween.Conical memberWhen reaching the inner diameter of the liquid, the liquid continues to flow downward into the tangential flow nozzle.
[0005]
US Pat. No. 5,637,217, granted to Herman et al. On June 10, 1997, is a continuation-in-part application based on US Pat. No. 5,575,912. U.S. Pat. No. 5,637,217 discloses a process for separating particulates from circulating fluids.
A pass circuit centrifuge is disclosed. The structure of this centrifuge includes a hollow cylindrical centrifuge bowl that is entirely cylindrical.Base plateIn combination with the liquid flow chamber. The hollow center tubeBase plateAnd extends axially upward into the hollow interior of the centrifuge bowl. The bypass circuit centrifuge is designed to be assembled in a cover assembly,Base plateThe centrifuge is rotated in the cover using a pair of tangential flow nozzles placed face to face to separate the particles from the liquid. Inside the centrifuge bowl are severalFrustoconical memberAnd these are providedConical memberIsStacked arrayAnd are closely spaced apart to enhance separation efficiency. The incoming liquid stream exits through a pair of oil inlets, from which the structureStacked arrayBe sent to. In one embodiment, the upper plate is placed on the inner surface of the centrifuge bowl.
Accelerate this flow in relation to the ribsStacked arrayPoint to the top. In another embodiment,Stacked arrayAre arranged as part of a disposable subassembly. In each example, adjacentConical memberAs the flow passes through the channels formed therebetween, particle separation occurs and the liquid continues to flow down to the tangential flow nozzle.
[0006]
US Pat. No. 6,017,300, granted to Herman on January 15, 2000, is for separating particulates from circulating fluids.Centrifuge using an assembly of conical membersIs disclosed. The structure of this centrifuge was formed with a hollow rotor hubAssembly of stacked conical membersAnd is configured to rotate about an axis.Assembly of stacked conical membersIs attached to the shaft center tube, this tube isBase partIt is attached to the hollow base hub.base portionFurther includes a liquid inlet, a first passage, and a second passage coupled to the first passage. The liquid inlet is connected to the hollow base hub by a first passage. The bearing deviceAssembly of stacked conical membersIs positioned between the rotor hub and the shaft central tube. The impulse-turbine wheel is attached to the rotor hub and the flow jet nozzle is positioned to be directed to the turbine wheel.Assembly of stacked conical membersA flow jet nozzle is coupled to the second passage for directing the liquid flow jet to the turbine wheel to impart rotational motion to the turbine passage. The liquid for the flow jet passes through the liquid inletCentrifugeEnter. In addition, the same liquid inletAssembly of stacked conical membersProvides a liquid that circulates through.
[0007]
US Pat. No. 6,019,717 granted to Herman on February 1, 2000 is a continuation-in-part application based on US Pat. No. 6,017,300. US Pat. No. 6,019,717 discloses a structure similar to that of the parent patent, but includes the addition of a honeycomb-like insert. The honeycomb insert is incorporated into the flow jet nozzle to reduce inlet turbulence and improve turbine efficiency.
[0008]
Increased separation efficiency provided by the inventions of US Pat. No. 5,575,912, US Pat. No. 5,637,217, US Pat. No. 6,017,300, and US Pat. No. 6,019,717 Is, in part,Conical memberPartly in reducing the settling distance across the gap. Over the concept of the present invention,Assembly of stacked conical membersIt can be theoretically concluded that an equivalent effect can be obtained by changing to a series of spiral wings or plates whose axial cross-sectional shape extends in a certain radial direction. The spiral wing of the present invention is integrally joined to the central hub and top plate, as will be described in more detail herein. The preferred embodiment describes this combination of components as a single molded combination to be a single component. The upper plate acts in conjunction with an accelerating blade provided on the inner surface of the shell so as to direct the outflow from the central part of the centrifuge to the outer peripheral edge of the upper plate where the inlet holes are arranged. A split shield placed adjacent to the outer periphery of the upper plate functions to prevent the flow from entering the spiral wing module through the outer perimeter between the wing gaps after diverting, i.e., bypassing the inlet holes. . If the flow is allowed to move in this way, the flow will be turbulent and the particles will be re-entrained to some extent. This is because the particles are released into this zone. Each spiral wing configuration is formed with a turbulent shield at the outer perimeter, which is between the outer stationary sludge collection zone and the gap between adjacent wings where liquid flows and particles are separated. As a means for further reducing fluid interaction there between, it extends over the entire axial length of each helical wing. In accordance with the theoretical concept of the present invention, an actual reduction occurred. Tests were conducted to confirm the advantages and improvements provided by the present invention.
[0009]
Commercial examples of the invention disclosed in US Pat. No. 5,575,912, US Pat. No. 5,637,217, US Pat. No. 6,017,300, and US Pat. No. 6,019,717 20 to 50 individualConical memberContains a stack made ofAssembly of stacked conical membersIs used. IndividualConical memberSeparately molded, stacked, liner shell and assembled before assemblyBase plateOr in the case of a disposable rotor design, it must be aligned with the hub or spool portion. This particular feature is expensive to process because it requires a large multi-cavity mold,Conical memberThe assembly costs are high due to the time required to stack and align each of them separately. Due to the “monolithic helix” concept of the present invention, the present inventionConical memberOne molded part can be used instead of all of the above. The spiral wings that make up the unitary module can be injection molded together with the hub portion of the module and the reference top plate at the same time. In another embodiment, these individual helical wings can be extruded with a hub and then assembled into a separately molded upper plate. With this alternative approach to the manufacturing method of the present invention, the total number of parts is reduced from 20 to 50 separate parts to 2 parts.
[0010]
The present invention provides the above-mentionedPrior art using an assembly of stacked conical membersA variant design for is provided. Self-driven as disclosed in US Pat. No. 5,575,912, US Pat. No. 5,637,217, US Pat. No. 6,017,300, and US Pat. No. 6,019,717Using a conical member assemblyThe design novelty and performance advantages of the design have been proven through practical use. Some of these successful invention "keys", namely the concept of automatic drive andConical memberAlthough the decrease in settling distance across the gap is retained, the basic design has been changed. Individually moldedConical memberThe use of a single spiral wing module instead of a vertical stack made of is considered a significant structural change and a new and unobvious advance in the art.
[0011]
[Problems to be solved by the invention]
One object of the present invention is to provide an improved self-driven centrifuge that includes a separator blade module.
[0012]
[Means for Solving the Problems]
In one embodiment of the present invention, a centrifuge for separating particulates from liquid flowing through a centrifuge includes a base and a centrifuge shell that is assembled to the base and defines a hollow interior space with the base. A hollow rotor hub having a central rotational axis and assembled to the base and extending through the hollow interior space, positioned in the hollow interior space, and cooperating with the hollow rotor hub, the outlet opening A support plate and a separation vane module formed and configured to be positioned within the hollow interior space, to extend around the hollow rotor hub, and to be supported by the support plate. The separation blade module includes a plurality of separation blades extending in the axial direction and spaced apart from each other.
[0013]
Related objects and advantages of the present invention will be apparent from the following description.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
For the purposes of promoting an understanding of the principles of the invention, reference will now be made to the embodiments illustrated in the accompanying drawings and specific language will be used to describe the same. However, the scope of the present invention is not intended to be limited thereby, and variations and modifications of the illustrated apparatus and uses other than those exemplified in the present specification of the principles of the present invention are within the scope of the present invention. It will be understood that a contractor would normally come up with it.
[0015]
Referring to FIGS. 1 and 2, these figures show the conventional design.Assembly of stacked conical membersInstead, a self-driven centrifuge 20 provided with an integral spiral blade module 21 is shown. Such conventional designs are disclosed in US Pat. No. 5,575,912, US Pat. No. 5,637,217, US Pat. No. 6,017,300, and US Pat. No. 6,019,717. Yes. By touching US Pat. No. 5,575,912 granted to Herman et al. On November 19, 1996, the contents disclosed in this patent are incorporated herein. By touching US Pat. No. 5,637,217 issued to Herman et al. On June 10, 1997, the content disclosed in this patent is incorporated herein. By reference to US Pat. No. 6,017,300 issued to Herman on January 15, 2000, the contents disclosed in this patent are incorporated herein. By mentioning US Pat. No. 6,019,717 issued to Herman on February 1, 2000, the contents disclosed in this patent are incorporated herein.
[0016]
Most of the overall packaging and structure of the centrifuge 20 is the same as that disclosed in the two above-cited US patents. The difference is thatAssembly of stacked conical membersIs replaced with the spiral wing module 21 of the present invention. Other minor structural changes to accommodate the spiral wing module 21 are included, as shown in the comparison of FIG.
[0017]
Centrifuge 20 accepts an inflow of liquid, typically oil, through an inlet opening provided in a corresponding support base (not shown) in US Pat. No. 5,575,912 and US It operates in the same way as the device described in patent 5,637,217. The liquid can flow into the hollow interior of the rotor hub by the connecting passage provided in the base. The rotor hub may be described as a bearing tube 22. The liquid then flows upward until it reaches the upper tube hole 23. Typically, four holes 23 are provided at equal intervals over the upper peripheral surface of the tube 22. As the liquid enters near the helical wing module 21, it flows out radially outward through these holes 23. The upper portion of the liner 24 is formed such that the accelerating vanes 25 cooperate to form a flow channel (one channel formed between each adjacent pair of accelerating vanes). ing. Typically, these four, six, or eight equally spaced accelerator blades facilitate the flow of oil (or other liquid) radially outward to form a spiral blade module. The liquid flow is sent out to the position of the inlet hole 26 formed in the upper plate 27 of 21. The liner 24 is surrounded by a shell 28 assembled to the base 29. The liquid enters the inlet hole 26, flows through the spiral wing module 21, and finally exits at the lower edge 31 of the module 21. At this point, the flow isBase plateIt passes through an annular gap 32 between the bearing 33 and the bearing tube 22 or the outer surface of the rotor hub. The outflow continues to flow into the two flow jet orifices 34 (only one is visible in the cross-sectional view). These two flow jet orifices provide an internal opening for two jet flow nozzles oriented tangentially. The high-speed jet exiting each nozzle orifice generates a reaction torque that drives (rotates) the centrifuge 20 at a sufficiently high speed of 3000 to 6000 rpm as the liquid flows through the spiral blade module 21. Particle separation is performed in a spiral wing module. The liquid flow through the centrifuge 20, including the specific flow path, and the use of the effluent liquid to automatically drive the centrifuge 20 are basically described in US Pat. No. 5,575,912, US Pat. , 637,217, U.S. Pat. No. 6,017,300, and U.S. Pat. No. 6,019,717, except that it occurs in the spiral wing module 21; The structure of the module 21 is different. Module 21 was shown in US Pat. No. 5,575,912 and US Pat. No. 5,637,217.Of an assembly of stacked conical membersThe structure is very different.
[0018]
Continuing with reference to FIGS. 1 and 2, the spiral wing module 21 is essentially disposed within the liner 24, essentially of the prior art.Assembly of stacked conical membersIs positioned in the same position as it was. The module 21 includes an upper plate 27 and helical wings 38 that are equally spaced apart (see gap 37) in a series of identical features. The concept of "equally spaced" refers only to the uniform pattern from spiral wing to spiral wing, and the space or gap defined by adjacent wings is radially outward. It has nothing to do with becoming bigger. The space or gap 37 between the adjacent blades 38 gradually increases from the position of the inner hub portion 39 to the outermost edge 40 in the radially outward direction (that is, becomes wider in the circumferential direction).
[0019]
The entire spiral wing module 21 is a single piece integrally molded from plastic. The individual wings 38 are joined along their inner edges to form a central tube or hub portion 39. This hub portion is designed to slide on a component sometimes referred to as a bearing tube or centrifuge rotor hub 22. By appropriately determining the size of the inner diameter of the hub portion 39 with respect to the outer diameter of the rotor hub, it is possible to form a concentric fit with a tight tolerance. This contributes to the overall balance desired by the rotational speed of the centrifuge.
[0020]
The spiral wing module 21 has an annular shape, and the individual spiral wings 38 (34 in total) are arranged so as to form a cylindrical shape as a whole. The molded hub portion 39 is also cylindrical. The upper plate 27 is generally conical in shape but includes a substantially flat annular ring portion 27a surrounding the hollow interior. The upper plate 27 may have a shape having a hemispherical upper surface. A split shield 44 is further included as a part of the module 21. This shield is disposed adjacent to the outer peripheral edge 43 of the upper plate 27. The split shield 44 also has an annular ring shape and extends horizontally outward in the radial direction. The plurality of inlet holes 26 formed in the upper plate 27 are disposed adjacent to the outer peripheral edge 43 of the upper plate. This outer peripheral edge is further adjacent and close to where the shield 44 begins. In the cross-sectional view of FIG. 2, the inlet hole 26 and the shield 44 are indicated by broken lines. This is because they are actually above the cutting plane 2-2. In order to show schematically where these features are located relative to the wing 38, the dashed form is used.
[0021]
The flow of liquid that leaves the tube hole 23 and is guided in the direction of the inlet hole 26 is actually “dropped off” by the acceleration blade 25 provided at a position corresponding to the inlet hole 26 (radial direction). ) " The flow is due to these inlet holes.
Pass through the upper plate 27. The upper plate is provided with one hole corresponding to the gap 37 between each pair of adjacent spiral wings 38. When the flow passes through the inlet hole and enters each gap 37, the flow flows radially inward and downward in the axial direction. This is because the outlet is on the outer surface of the rotor hub.Base plateIt is because it is arrange | positioned between the inner edge parts. The flow dynamics are as follows. That is, the flow exiting the tube holes 23 tends to be evenly distributed over the surface of the upper plate and thus evenly distributed through the 34 inlet holes 26. As described above, one inlet hole corresponding to each gap and one gap corresponding to each blade 38 are provided. When the liquid flow moves from the outer wide part through the gaps 37 to the inner narrow part adjacent to the rotor hub, the centrifugal force due to the high-speed rotation of the centrifuge acts on the heavy granular material, Gradually move outward in the direction, collect on the concave surface of the spiral wing and continue to slide outward. The particulates now finally exit the module and accumulate in a sludge collection zone located between the periphery of the module 21 and the inner surface of the liner shell 24. One possible particle path for particle 45 is shown schematically in FIG. The split shield 44 extends radially outward from approximately the position of the inlet hole 26 to a position near the inner surface 48 of the liner 24 but not in contact therewith. The split shield 44 prevents the flow from bypassing the inlet hole 26 and thereby prevents disturbing the stationary zone 50 where the sludge (separated particulates and some oil) is collected. By preventing the flow from disturbing the stationary zone 50, the design of the present invention greatly eliminates the re-entrainment of particulates already separated from the flowing liquid. The concept of re-entrainment is to loosen some of the particulate already separated from the liquid stream or take it up again and return it to the liquid, thereby wasting work already done. The separation distance between the split shield 44 and the inner surface 48 of the liner 24 is also large enough to allow relatively large particulate matter that can be separated in the region of the accelerating blade 25 to be discharged into the stationary zone 50. Please pay attention.
[0022]
When the liquid flow passes through the inlet hole 26 and enters the separation gap 37, it spreads in the gap and advances toward the lower edge 31 radially inward and axially downward. The flow exits through the gap space 32 at the lower edge.Base plate33 closes any other exit path other than the flow opening provided by the clearance space 32 (see FIG. 1A) defined by the 33 circular inner edges 51 and the outer surface 52 of the bearing tube or rotor hub 22.Base plateBy using 33, the flow is prevented from bypassing the predetermined flow gap 37.
[0023]
In the modification of the present invention (see B in FIG. 1),Base plate33 a extends until it comes into contact with the bearing tube 22 and closes the gap space 32. To provide a flow path,Base plateA plurality of gap holes 33 b are formed in 33 a at substantially the same position as the gap space 32. For the purpose of simplifying the drawing, the individual bases 38 are omitted from the cross-sectional views of FIGS. Instead of circular holes 33b, virtually any type of opening can be used, including radial slots and / or circumferential slots.
[0024]
Referring to FIGS. 3, 4, and 5, these drawings show the structural details of the spiral wing module 21. 3 and 4 are perspective views of the integral molding design of the module 21. FIG. FIG. 5 is a schematic plan view of a pair of spiral wings 38 and a gap 37 positioned between the wings. As partially described with respect to the flow path, the spiral wing module 21 includes 34 spiral wings 38, each of which is practically the same structure and is integrally joined to an integral molded module. ing. Each of these 34 spiral wings 38 is integrally joined to the lower side of the lower surface of the upper plate 27 along the upper edge portion thereof as an integral structure part. Each helical wing 38 extends away from the upper plate in the axial direction toward its corresponding lower edge 31. The inner edge of each wing is formed to cooperate with the inner hub portion 39. Each helical wing 38 includes a convex outer surface 55 and a concave inner surface 56. These surfaces define a spiral wing having a substantially uniform thickness of about 1.0 mm (0.04 inches). The convex surface 55 of one wing cooperates with the concave surface of the adjacent wing and defines a corresponding gap 37 between the two wings. The width of the gap between the wings, that is, the thickness in the circumferential direction thereof, increases toward the outside.
[0025]
Each helical wing 38 is curved to partially surround the corresponding inlet hole 26 as it extends radially outward away from the inner hub portion 39 (curved portion 57). This portion 57 extends away from the position of the inlet hole in the tangential direction to form a turbulent shield 58. The turbulent shield 58 of one spiral blade 38 extends in the counterclockwise direction in the circumferential direction toward the adjacent blade in a plan view. A separation gap 59 is defined between the free end or free edge of the shield 58 of one wing and the curved portion 57 provided on the adjacent spiral wing. This separation gap is actually an axial slit or full length slit and has a circumferential width of about 1.8 mm (0.07 inches). The slight curvature of each turbulent shield 58 cooperates with alternating separation gaps 59 to form a generally cylindrical configuration that defines the outermost surface of the spiral wing module 21 positioned below the top plate 27. To do.
[0026]
The curvature from the inner edge of each helical wing to the curved outer part has a unique shape. The line 60 drawn from the axial centerline 60a of the centrifuge rotation to the intersection 61 on any one of the 34 spiral blades 38 is a tangent 62 to the curvature of the spiral blade at the intersection. And an included angle 60b of 45 ° (see FIG. 2). This unique shape applies to the convex and concave portions of the main body of each helical wing and does not include either the curved portion 57 or the turbulent shield 58. In a preferred embodiment, an included angle of 45 ° can be described as the spiral blade angle for the spiral blade module and the corresponding centrifuge. A preferred range for the included angle is believed to be 30 ° to 60 °. In the above-mentioned US Pat. No. 5,575,912 and US Pat. No. 5,637,217, typically 45 °.The angle of the conical member is,eachConical memberDefined based on the slope of the conical wall of the present invention.ThenSpiral wingofDefine the angle.
[0027]
In the process of flow through the gap 37, the particulates to be separated drift outward across the gap by a radial centrifugal force component, with a radial path through the gap between adjacent wings 38. . This granulate is actually the same as in the above-mentioned US Pat. No. 5,575,912 and US Pat. No. 5,637,217.Assembly of stacked conical membersDrifts upstream with respect to the flow direction in the same way as occurs in When particles containing particulate matter to be separated from the liquid flow reach the concave inward spiral surface of the corresponding wing (see FIG. 5), these particles lose their flow velocity due to the fluid boundary layer. Therefore, it moves outward in the radial direction. This radially outward path is in the direction of the sludge collector or stationary zone 50. The particles then “fall” from the spiral wing module through a continuous axial slit. These axial slits are arranged between the discontinuous turbulent shields in the circumferential direction of the corresponding spiral wing (ie the separation gap 59). As explained above, the function of the turbulent shield is to reduce the fluid interaction between the flow occurring in the gap 37 and the sludge collection zone (stationary zone 50). Although this sludge collection zone is referred to as a “static zone”, the choice of term represents a preferred or desired state. Ideally, this sludge collection zone 50 is completely stationary so that there is virtually no turbulence and there is no risk of particulates being re-entrained in the liquid stream. In the present invention, the turbulent shield 58 is arranged to form or define a circular contour when viewed in plan view. However, the fact that these turbulent shields 58 can be tilted slightly outwards in order to allow the particulate matter collected on the inner surface of each turbulent shield to also "slide out" into the collection zone is It is considered to be included in the category of the invention. Since corners are effectively formed at the location of the curved portion of each helical wing, some of the particulates tend to accumulate at the corners. By tilting the turbulent shield portion, this corner is opened, and as a result, the tendency to allow the trapped particulate matter to slide into the sludge collection zone (stationary zone 50) is increased. The shape of a preferred modification of the turbulent shield portion is shown by a broken line in FIG.
[0028]
After leaving the gap between adjacent spiral blades, the flow exits the gap space adjacent to the rotor hub, passes through the jet nozzles, is discharged at these nozzles at high speed, and the rotor hub rotates at high speed by the reaction force. Let As a variant on this feature, a specific rotor can be driven by a rotor-mounted impulse turbine. In addition, the spiral shaped wing module is similar to the sludge containing liner shell / similar to that disclosed in US Pat. No. 5,637,217.Base plateCan be “encapsulated” inside the assembly. This particular configuration allows the centrifuge rotor to operate quickly and easily. This is because the entire sludge is contained in the inner capsule, and scraping and cleaning are unnecessary. In another aspect, the helical wing module of the present invention is included as part of a fully disposable centrifuge rotor design.Assembly of stacked conical membersCan be used.
[0029]
Referring to FIG. 6, there is shown a schematic diagram with the sides facing each other. This figure shows a typical prior artAssembly of stacked conical membersHalf of 64 is shown on the left side of the centrifuge 63 and half of the spiral wing module 21 according to the invention is shown on the right side. FIG. 6 is intended to supplement the above description. Instead of the spiral wing module 21 of the present invention, US Pat. No. 5,575,912, US Pat. No. 5,637,217, US Pat. Prior art as described in US Pat. No. 6,017,300 and US Pat. No. 6,019,717.Assembly of stacked conical membersIndicates that it is or can be used. Corresponding between the two typesBase plateAlthough the 65 and 33 designs are slightly different, the balance of the centrifuge structure is practically the same for each type.
[0030]
Referring to FIGS. 7A, B, and C, these figures show three alternative designs for the type of spiral wing used as part of the spiral wing module. Included in the theory and function of the present invention,Assembly of stacked conical membersWhile retaining the concept of using a spiral wing module instead, any of these alternative designs can be used.
[0031]
In FIG. 7A, instead of the curved spiral wing 38 of the module 21, a wing 68 having a substantially flat plane is used. These wings 68 are offset so as to extend outward, but not purely radially. The top view of FIG. 7A shows a total of 24 wings or liner plates 68, but the actual number depends on the overall size of the centrifuge, the viscosity of the liquid, and the particle size to be separated. It can be increased or decreased according to variables such as desired efficiency. The pitch angle (α) or inclination of each plate is another variable. If each plate 68 is set to the same radial angle (α), the selected angle can be varied. The choice of angle is made in part according to the rotational speed of the centrifuge.
[0032]
In FIG. 7B, the individual wings 69 are curved in the same manner as the type of the wings 38, but the degree of curvature is large. That is, it has a larger concave shape. Furthermore, each individual wing 69 gradually increases in curvature as it moves away from the bearing tube 22. This wing shape is described as “hyper spiral” and is geometrically defined as follows. First, a radial line 72 drawn from the axial centerline of the bearing tube 22 that is also the axial centerline of the module 21 is used, and this line intersects with a point 73 on the convex surface of one wing. . A tangent line 74 is drawn at this intersection 73 to define an included angle 75 between the radial line and the tangent line. The size of the included angle 75 increases as the intersection 73 moves away from the bearing tube 22. The theory of this variation of the spiral wing is to form each wing such that there is a constant particle slip velocity because the g-force increases in proportion to the distance from the axis of rotation. The spiral wing module schematically shown in FIG. 7B is the same as the spiral wing module 21 except for the curved shape of each wing 69.
[0033]
In FIG. 7C, the spiral wing design for the corresponding module is based on the wing 69 of the FIG. 7B design with the addition of a partial splitter wing 70. One splitter blade 70 is provided between each pair of full blades 69, and the size, shape, and position of each splitter blade are the same throughout the module. Splitter blades 70 are similar to the blades used in turbocharger compressors because they increase the total surface area of the blades regardless of the number of blades. The blade spacing is limited by the tight spacing at the inner diameter of the hub.
[0034]
Other design changes and considerations of the present invention include changes in manufacturing and molding techniques. For example, a cylindrical shape is stretched as a continuous member on the entire forming blade (or plate), and then separated at a desired axial length or height, and is assembled into an upper plate that is typically manufactured separately by molding. be able to. The upper plate is formed with desired inlet holes and split shields as part of the module 21 as described above.
[0035]
Another design change contemplated for the present invention is to divide the spiral wing module into two parts, an upper half and a lower half cooperating therewith. This manufacturing technique is used to eliminate the molding difficulties caused by the small spacing between the blades. After the two halves are manufactured, the halves are joined together to form an integral module. In this method, the upper plate is molded integrally with the upper half of the wing subassembly; andBase plateIs considered to be integrally formed with the lower half of the wing subassembly.
[0036]
As shown in FIG. 8 and FIG. 8A, any one of the spiral blade module 21 and / or the three variations of (spiral) blade types A, B, and C of FIG. It can be used in combination with an impulse-turbine driven centrifuge 80. For this figure, a spiral wing module 21 was used. The impulse-turbine device 81 is shown schematically in FIG.
[0037]
Use any of the spiral wing module 21 and / or the three variants (spiral) wing types of FIGS. 7A, 7B and 7C in a cooperating centrifuge (not shown). It can be used as a part of a disposable rotor 82 suitable for the purpose. A spiral wing module 21 is included in FIG. Furthermore, it is also conceivable that the disposable rotor 82 of FIG. 9 can be used in combination with an impulse-turbine driven centrifuge such as the centrifuge 80.
[0038]
While the invention has been illustrated and described in detail in the accompanying drawings and foregoing description, it is to be considered as illustrative and not restrictive in character and is only shown and described in preferred embodiments. It should be understood that this is intended to protect all variations and modifications that fall within the spirit of the invention.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a self-driven centrifuge according to an exemplary embodiment of the present invention, and FIG. 1A is a partial cross-sectional view taken along line 1A-1A of the centrifuge of FIG. 1B is a partial plan sectional view of a modification of the present invention viewed from the same direction as the line 1A-1A in FIG.
2 is a cross-sectional view of the centrifuge of FIG. 1 taken along line 2-2 of FIG.
3 is a perspective view of a shaped spiral wing module constituting one part of the centrifuge of FIG. 1 according to the present invention.
4 is a perspective view of the spiral wing module of FIG. 3 as viewed from below. FIG.
FIG. 5 is a schematic partial plan view of two spiral wings and corresponding particle paths of the spiral wing module of FIG. 3;
[Fig. 6] Prior artAssembly of stacked conical membersFIG. 4 is a schematic longitudinal sectional view for comparing side by side with the spiral wing module of FIG. 3 according to the present invention.
FIG. 7A is a schematic plan view of a modified wing according to the present invention, B is a schematic plan view of another modified wing according to the present invention, and C is a further modified variation according to the present invention. It is a schematic plan view of an example wing.
FIG. 8 is according to another embodiment of the present invention.Impulse turbineFIG. 8A is a longitudinal sectional view of a driven centrifuge, and FIG. 8A is related to the centrifuge of FIG.Impulse turbine1 is a schematic plan view of a device of the formula.
FIG. 9 is a longitudinal sectional view of a disposable rotor according to another embodiment of the present invention.
[Explanation of symbols]
20 Centrifuge 21 Spiral Wing Module
22 Bearing tube 23 Upper tube hole
24 liner 25 acceleration wing
26 Inlet hole 27 Upper plate
28 shell 29 base
31 Lower edge 32 Annular gap space
33Support plate 34 Flow jet orifice

Claims (15)

A centrifuge for separating particulates from liquid passing through the centrifuge, wherein the centrifuge is:
Base and
A centrifuge shell assembled to the base and defining a hollow interior space with the base;
A rotor hub assembled in the base and extending into the hollow internal space, and having a hollow portion;
A support plate positioned within the hollow interior space and defining at least a portion of an outlet opening;
The being positioned in the hollow interior space, the fitted onto the rotor hub, is and constructed and arranged to be supported by the support plate, a separation blade module, the separation blade module, the distance The separation wing module being a one-piece molded member including a plurality of separation wings spaced apart and extending in an axial direction;
And having
A centrifuge in which a gap is formed between each pair of the adjacent separation blades, and the gap extends without a break over substantially the entire axial length of each separation blade.   The centrifuge according to claim 1, wherein the separation blade module has an upper plate that defines a plurality of inlet holes to allow liquid to flow into the separation blade module.   The centrifuge according to claim 2, wherein each separation blade of the plurality of separation blades has a curved shape.   The centrifuge according to claim 3, wherein the separator module has a split shield extending in a radial direction to facilitate inflow of liquid into the inlet hole.   Each of the plurality of separation blades has a turbulent shield, and the turbulence shield is configured to reduce the turbulence of the liquid exiting the separation blade module in a radial direction from between adjacent separation blades. The centrifuge according to claim 4.   The centrifuge according to claim 5, wherein each of the plurality of separation blades includes a curved portion formed so as to partially surround a corresponding one of the plurality of inlet holes.   The centrifuge of claim 2, wherein the separator module has a split shield extending in a radial direction to facilitate inflow of liquid into the inlet hole.   The centrifuge according to claim 2, wherein each of the plurality of separation blades includes a curved portion formed so as to partially surround a corresponding one of the plurality of inlet holes.   The centrifugal separator according to claim 1, wherein each of the plurality of separation blades has a turbulent shield to reduce turbulence of liquid exiting the separation blade module in a radial direction from between adjacent separation blades. Machine.   The centrifuge according to claim 1, wherein each of the plurality of separation blades has a substantially flat shape.   The centrifuge of claim 10, wherein the separator module includes an upper plate that defines a plurality of inlet holes for allowing liquid to flow into the separator module.   The centrifuge according to claim 1, wherein an angle formed by a line extending in a radial direction from the rotation axis and intersecting the separation blade and a tangent of the intersection is 30 ° to 60 °.   The centrifuge according to claim 1, wherein each of the plurality of separation blades has a hyper spiral shape. The centrifuge according to claim 1, wherein the outlet opening is formed between the support plate and the rotor hub. The centrifuge according to claim 1, wherein the opening of the outlet is entirely formed in the support plate.

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